Calculation and operation and maintenance of the gear pump

Contents

CONTENTS

Introduction

1. GEAR PUMP DESIGN

2. PRINCIPLE OF OPERATION OF GEAR PUMP

3. GEAR PUMP CALCULATION

3.1 Initial data

3.2 Determination of geometrical dimensions of gears

4. Measures to combat compression of fluid in tooth cavities

5. Materials and Requirements for Gear Pump Fabrication

6. Conclusion

7. List of used literature

Introduction

In this heading work, the calculation of the gear pump is presented. During the work, he determined the geometric dimensions of the gears, made a calculation of the housing, as well as a calculation of the parts of the gear pump.

Gear hydraulic machine is one of the types of volumetric hydraulic machines. Like other types of volumetric rotary hydraulic machines, it can fundamentally work both in pump mode and in hydraulic motor mode. If a torque is applied to the shaft of the hydraulic machine, the machine operates in pump mode. If working fluid is supplied to the input of the hydraulic machine under pressure, then the torque is removed from the shaft, and the machine operates in hydraulic motor mode.

Gear hydraulic machines are extended with external and internal engagement. Hydraulic machines with internal engagement are more compact, but due to the complexity of manufacture are rarely used. In addition, internally engaged machines are able to operate at much lower pressures (about 7 MPa, less often up to 14 MPa) than externally engaged machines. Sometimes gears with oblique teeth are used to reduce noise and non-uniformity of supply.

Principle of gear pump operation

The operation of the hydraulic gear machine is as follows. When torque is supplied to shaft 4, the latter promotes rotation of its wheel 1, and by the fact that its teeth 2 are engaged with the mating teeth, made on the other wheel 1, both of them rotate at the same angular speed according to arrows C. Such rotation of the wheels 1 facilitates transportation of working fluid 10 coming through suction branch pipe 8 according to arrows A along recesses 11 and slots of cone-shaped shape 13 into hollow space of teeth 2, towards delivery branch pipe 9. As soon as each of the teeth 2 of the wheels 1 is pulled out of the area of the recesses 11 and their end surfaces move along the radii 12 of the discs 6, they are elastically compressed by the arrows P (see Figure 3) and the grooves of the cone-shaped shape 13 are blocked, thereby forming integral teeth 2 along their length, thereby eliminating the flow of working fluid 10 from the inner cavity of the latter into their inter-tooth space. Further movement of the teeth 2 along the arrows C causes each of them to successively enter the area of the recesses 11 of the delivery pipe 9, and then, under the action of elastic forces, the previously compressed teeth 2 formed by the space formed by the discs 6, they also elastically deform along the arrows K (see Fig. Therefore, in such a position of the teeth 2, under the action of centrifugal forces, the working fluid 10 flows into the delivery pipe 9 not only through the end portions of the teeth 2, but also through the slots of the cone-shaped shape 13, thereby facilitating their effective cleaning from the latter. Further, the described processes may be repeated repeatedly.

Conclusion

During the calculation of the course project, I acquired the skills of designing a gear hydraulic machine, and also deepened and consolidated theoretical knowledge on the course "Ship auxiliary mechanisms, systems and devices." During the work, he determined the geometric dimensions of the gears, and also clarified the requirements for the production of gear pumps.

I attach the drawings of the gear pump to the course work.

NSh-32_spetsifikatsia.cdw

Veduschaya_shesternya_nasosa_tipa_NSh-32.cdw

NSh-32.cdw