CN2359497Y

CN2359497Y - High-pressure gear pump

Info

Publication number: CN2359497Y
Application number: CN 99201606
Authority: CN
Inventors: 金章
Original assignee: Permco Tianjin Hydraulic Inc ltd
Current assignee: Permco Tianjin Hydraulic Inc ltd
Priority date: 1999-01-11
Filing date: 1999-01-11
Publication date: 2000-01-19
Anticipated expiration: 2009-01-11

Abstract

The utility model relates to a high-pressure gear pump. The utility model comprises a pump body, a driving gear, a driven gear, a side plate, a supporting bearing and a shaft sealing ring, wherein, the side which is reverse to the end surface of a gear of the side plate takes in annular steps of the supporting bearing of the a gear shaft; besides, the outer diameter of the side plate is positioned relatively to inner holes of a pump body of the gear pump, and the inner diameter of the side plate is positioned relatively to an outer ring of the bearing through the steps. The utility model is simple in structure and can improve the volumetric efficiency of the pump.

Description

High-pressure gear pump

The utility model relates to a kind of high-pressure gear pump, or rather, relates to a kind of high-pressure gear pump with lateral plate structure.

In the engineering machinery field,, require hydraulic system to improve pressure,, need improve pressure to this as the gear pump of the power source in the hydraulic system to increase the power of machinery for improving mechanical property and quality.

Gear pump relies on the variation of the working space volume that gear causes in the process of being meshing with each other to carry liquid, and its volumetric efficiency depends on the axial clearance between gear face and the side plate and the size of the radial clearance between the tooth item and the pump housing basically.

Have the fixedly gear pump of axial clearance, when head pressure is big, leak sharp increase, volumetric efficiency is very low.In order to reduce leakage, in existing known high-pressure gear pump, adopt compensation hydraulic axial clearance usually, add floating side plate or flexible side plate and use special seal arrangement at gear face, draw highly pressurised liquid to the side plate outside from discharge side, side plate is pressed against on the gear face, but this method complex structure, and manufacture cost is higher.But, then aspect volumetric efficiency, do not reach desired pump performance again if adopt fixed lateral plate and conventional seals ring structure with low cost.

Therefore, the purpose of this utility model is, a kind of centering lateral plate structure of high-pressure service pump of novelty is provided, thereby obtains the volumetric efficiency of the pump of an improvement when keeping simple in structure, making economy.

By this purpose of the utility model is that high-pressure service pump by following structure disposes and realizes.Described high-pressure service pump side plate has in a side of gear face dorsad and is respectively applied for the ring-shaped step of admitting driving and driven gear shaft block bearing, and this side plate external diameter is with respect to pump housing endoporus location, and its internal diameter is then respectively by the outer ring location of ring-shaped step part with respect to corresponding bearing.And, seal ring being set the two ends of gear face dorsad at the driving shaft block bearing, its side to small part has towards the high pressure side portion's section of tapered reduction gradually.

By the utility model owing to adopted fixed symmetrical side plate centering scheme, thereby compact structure, easy to assembly, the Location accuracy height.In addition, owing to adopted curved seal ring, further enhanced leaktightness effect.

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1 is the structure diagram of the utility model high-pressure service pump,

Fig. 2 is the view of the side plate of the utility model high-pressure service pump;

Fig. 3 is the view of the utility model seal ring.

Label 7,10 is represented the master of gear pump respectively among Fig. 1, and driven gear transmits liquid by its mutual engagement.Roller bearing 9 is at two-side supporting driving gear shaft 3, in addition, above-mentioned two bearings dorsad a side of driving gear one lip ring 2 respectively is set.The side that side plate 1 matches with gear face is one and has two planes that are used for the through hole of gear shaft on it, on this plane near meshing zone of gears in the suction side of liquid with discharge the drain charge groove 14 (Fig. 2) that side has symmetry; A side plate side of gear face dorsad then is formed for admitting the ring-shaped step structure 15 of block bearing respectively, and has the through hole 13 of the highly pressurised liquid of leakage on the step wall of its common middle joint.Still, make the pump hole location of side plate external diameter this moment with respect to gear pump body 4 with reference to Fig. 1; And, utilize the outer ring of bearing 9 to locate by the internal diameter that step 15 carries out side plate 1 at opposite side.During work, high pressure oil enters side plate 1 gear face one side dorsad through clearance leakage, thereby to the side plate applied thrust, this side plate is attached on the gear face hermetically, reduces thus and leaks.

By on the other hand of the present utility model, be provided with seal ring 2 sealings in the relative two ends of gear face dorsad at drive shaft bearing 9, to prevent the leakage of high pressure oil.Wherein said seal ring designs like this, promptly as shown in Figure 3, make it have portion's section 11 to small part, can reduce the wall thickness of ring like this towards a side tapered reduction of highly pressurised liquid in the side, thereby when the highly pressurised liquid axial pressure, except that the sealing of the end face of seal ring and lid 6, on the inclined-plane, can produce a downward component, make seal ring further be adjacent to driving shaft, reduce endoporus leakage loss, strengthen the sealing effect of sealing ring thus, improve the volumetric efficiency of pump.In addition, have the annular groove 12 of circular arc to the base portion of seal ring side transition, can further improve the stability of the liquid stream that is sealed thus in described portion's section towards the high pressure side tapered reduction.

In addition, by another optimal way of the present utility model, the front end of the driving shaft on the power input direction is provided with a preposition bearing 8, to be used for further eliminating the radial pulsation power that produces on driving shaft.

Claims

1. high-pressure gear pump, comprise the pump housing (4), the driving and driven gear (7 that in the pump housing, meshes, 10), the side plate of gear both sides (1), gear shaft block bearing and Simmer ring (2), it is characterized in that: described side plate (1) has the ring-shaped step (15) of admitting the gear shaft block bearing respectively in a side of gear face dorsad, and this side plate (1) external diameter is then located with respect to described gear shaft pedestal bearing outer race by described step (15) aspect internal diameter with respect to the endoporus location of the gear pump pump housing (4).

2. by the described high-pressure gear pump of claim 1, it is characterized in that described side plate (1) has the drain charge groove (14) of symmetry at it on the plane of a side of gear face.

3. by the described high-pressure gear pump of claim 2, it is characterized in that described side plate (1) has liquid-through hole (13) on the common intermediate connecting wall of the step of gear face side (15) dorsad at it.

4. by the described high-pressure gear pump of claim 1, it is characterized in that: the side of described Simmer ring (2) have at least part towards the high pressure side portion's section (11) of tapered reduction gradually.

5. by the described high-pressure gear pump of claim 1, it is characterized in that: the front portion of the driving shaft on the power input direction (3) is provided with a preposition bearing (8).