Vane pump assembly and installation technology

Contents

Contents

1 Device and operation of the article

Specification for blade pump assemblies and parts:

2 Design Assembly Sequence and Build Flow Chart

3 Designing Assembly Operations and Assembly Process Sketches

4 Design of acceptance testing operation

5 Description of technology of assembly disassembly and its parts defect

List of literature

4 Design of acceptance testing operation

After assembly of the vane pump, it is checked and concluded that it is worthwhile using the acceptance test point. The pump is checked according to the main parameters: mass, efficiency, head power, supply index, speed, vibration, noise and safety [2].

The pump shall be considered suitable if during the tests all parameters are within the permissible values.

The content of the acceptance inspection operation includes the following transitions [3]:

inspection of the appearance, integrity and quality of the pump painting (external inspection);

check of pump completeness: presence of covers, pins, keys, etc. (as per general view drawing);

quality control of fasteners tightening: bolts and screws;

monitoring of overall and connecting dimensions, distances of input and output shafts axes from pump support surfaces;

control of rotation speed, efficiency, weight, parameters of supply, vibration, noise and head;

check of clearances in bearings and monitoring of radial run-out of high-speed shafts;

clearance monitoring (probe, wire method).

The pump shall be considered suitable if during the tests all parameters are in the permissible values.

Description of technology of assembly disassembly and its parts defect

The vane pump is disassembled as follows:

remove screws (15) and disconnect cover (10);

remove sealing ring (6);

remove spring (3) and remove pin (4);

press out the bearing 17 from the splined shaft 1;

remove the disk with neck (5);

remove rotor 11 with stator 12;

disconnect rotor (11) from stator (12) and remove blades (8);

remove the flat disk (2) from the housing (9);

remove bolts (14) and disconnect flange (7);

remove cuff (13) from flange (7);

remove the splined shaft 1 from the housing 9;

press out the bearing 16 from the splined shaft.

Before the parts are defective, clean, rinse, degrease and dry. The parts covered with heavy oily deposits (parts of the pump flow part) shall be washed in a bath with 8-10% caustic soda solution at 100 ° C for 30-40 minutes. Put washed and cleaned parts for 10-15 minutes in an aqueous solution of passivator to protect against corrosion [3].

The parts shall be defected at a special workplace equipped with defect maps and the necessary set of instruments and measuring tools.

Control of bearings includes inspection, noise and lightness check, measurement of axial and radial clearances, measurement of ring dimensions. The diameters of the rings are measured only in the event of a shift of the rings on the shaft or housing, as well as in the presence of traces of corrosion, burns and blackness.

Bearings do not allow [3]:

cracks or tinting of metal on rings and rolling bodies, colour of benevolence at any place of bearing;

potholes and prints (holes) on the treadmills of the rings ;

metal exfoliation, flaky exfoliations;

corrosion shells, nicks, hairlines and dents on the rolling surface visible to the naked eye;

fractures, through cracks on the separator, absence or weakening of rivets of the separator;

nicks and dents on the separator preventing smooth rotation of the bearing;

perceptible step-by-step working surface of rings;

axial clearance is more than 0.08 mm and radial clearance is more than 0.1 mm ;

when checking for ease of rotation - sharp metal or drab sound, as well as noticeable braking and jamming.

Spring washers shall not have cracks or breaks.

During the inspection of the housing, special attention should be paid to the state of the seats for the stator, sealing rings of the housing and the connector cavity, wear of the internal cavity, the state of the sealing surfaces of the sections, centering pins, and the amount of gaps between the sealing rings of the sections.

Wear of individual places of the internal cavity of the housing must be eliminated by metal surfacing using electric welding. Hairlines, nicks and dents on the planes of the housing connector are eliminated by grinding with a blade or brew. Significantly worn sealing surfaces are pierced or milled [3].

Shaft distortion occurs as a result of failure of bearings.

Wear of shaft necks can occur due to the appearance of hairlines, balls, corrosion centers and for other reasons with subsequent failure of rolling or sliding bearings.

Shaft breakage is observed in places of shaft transition from diameter of seat for protective sleeve to diameter of shaft journal. Breakage occurs as a result of local stress concentration [3].

Defective splines on the shaft are restored by the cutter. If the damage is significant, then this section of the shaft is swept to the base of the splines, and then built up, processed, and new splines are cut on it.