CN2758528Y

CN2758528Y - Unload type non-leakage high pressure, medium pressure gear pump

Info

Publication number: CN2758528Y
Application number: CN 200420078903
Authority: CN
Inventors: 任光宪; 沈勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-08-18
Filing date: 2004-08-18
Publication date: 2006-02-15
Anticipated expiration: 2014-08-18

Abstract

The utility model discloses an unloading type high pressure and medium pressure gear pump without external leakage. The combined face of a front cover and a rear cover of the pump body is provided with an unloading groove which can communicate an outer sealing groove with a low pressure zone. When the gear pump works, the gear pump can carry off high pressure oil gathering at the inner side of an outer sealing ring to enable the pressure at the inner side and the outer side the outer sealing ring to be zero, which fundamentally solves the ubiquitous problem at present that the oil liquid leaks externally because of the reciprocal action of the large pressure difference. Simultaneously, compared with the gear pump with the existing structure, the performance, the volumetric efficiency and the intensity of the pump body are improved.

Description

Discharging type does not have the high pressure of leaking outside, mesohigh gear pump

Technical field:

The utility model relates to the hydraulic parts in the mechanical field, specifically is that a kind of discharging type does not have the high pressure of leaking outside, mesohigh gear pump.

Background technique:

High pressure, mesohigh gear pump are to use maximum power sources in the present hydraulic transmission, and the gear pump of 3 stops band floating buss (side plate) structure, because technological performance, advantage such as simple in structure, easy to process have obtained using the most widely.

But, the gear pump of original this structure, owing to be the trisome combination of the forward and backward lid and the pump housing, prevent the seal ring that leaks outside although on junction plane, designed, but because the inside and outside both sides of seal ring exist very big oil pressure poor, the accuracy of manufacturing error of seal groove and seal ring in addition is under high pressure, high temperature and long-term percussion, junction plane place ubiquity is let out the defective of (oozing) leakage of oil, causes environmental pollution and energy waste.

Summary of the invention:

At above-mentioned high pressure, mesohigh gear pump (oozing) leakage of oil defective that leaks, the utility model designs a kind of discharging type does not have the high pressure of leaking outside, mesohigh gear pump, has fundamentally avoided the oil leakage phenomenon at 3 stops gear pump bilateral junction plane place.

For achieving the above object, the utility model is according to the working principle of 3 stops gear pump, fluting (calling compensating groove in the following text) on the pump housing and forward and backward lid junction plane, compensating groove one end is communicated with low pressure area, the other end is communicated with the external sealed groove, and the inboard annular pass that forms of external sealed groove and its seal ring makes the inboard high pressure oil of assembling of external sealed groove that current return circuit arranged, the pressure of exterior seal ring both sides has obtained balance (being that pressure difference is close to zero), has solved (oozing) leakage of oil problem of letting out of high pressure, mesohigh gear pump.

The utility model is compared with existing high pressure, mesohigh gear pump, under high pressure through impacting no any letting out (oozing) oil leakage phenomenon more than 400,000 times.Simultaneously, pump performance, volumetric efficiency and pump housing strength ratio existing structure gear pump are significantly improved, specifically: 1, since the high pressure oil of exterior seal ring inboard by carrying-off, make the axial oil pressure that forward and backward lid bore reduce (reducing 1/4 approximately) greatly, thereby reduced the axial deformation and the opening and closing amount of forward and backward lid, made pump performance be improved (volumetric efficiency has improved 1-2 percentage point); 2, reducing because of axial oil pressure that forward and backward lid bore, make forward and backward lid of connection and pump housing bolt that bigger safety coefficient arranged, or diameter can reduce one grade, and the diameter of bolt reduces to be not only and has reduced cost, the more important thing is and dwindled via diameter on the pump housing (diameter can dwindle 2mm), thereby make pump housing intensity obtain reinforcement, improved the reliability of gear pump; 3, because of the no pressure difference in the outside in the exterior seal ring, can not produce and let out (oozing) oil leakage phenomenon,, need not to resemble the painstakingly pursuit of disregarding cost common the machining accuracy of quality, performance and exterior seal ring and the external sealed groove of exterior seal ring.

Description of drawings:

Leak outside for discharging type the does not have erection drawing of high pressure, mesohigh gear pump of Fig. 1;

Fig. 2 is the A-A sectional drawing of Fig. 1;

Fig. 3 is the B-B sectional drawing of Fig. 2;

1 is protecgulum among the figure, and 2 is the pump housing, and 3 is bonnet, and 4 is axle sleeve, and 5 is exterior seal ring, 6 is inner seal ring, and 7 is bolt, and 8 is driven gear, and 9 is driving gear, and 10 is outside framework oil seal, 11 is low pressure area, and 12 is the zone of high pressure, and 13 is compensating groove, and 14 is the external sealed groove, and 15 is annular flow path.

Embodiment:

Now make an explanation in conjunction with the accompanying drawings, as shown in Figure 2, on the junction plane of the pump housing 2 and protecgulum 1, bonnet 3, have a compensating groove 13, one end of compensating groove 13 is communicated with low pressure area 11, the other end is communicated with external sealed groove 14, this compensating groove 13 can be opened on the pump housing 2, also can open on protecgulum 1, bonnet 3 and (not provide diagram), but to be arranged on same junction plane better with external sealed groove 14.

The position of described compensating groove 13 on the pump housing 2 or protecgulum 1, bonnet 3 junction planes, as long as zone of high pressure and low pressure are connected, on the junction plane all can slot in arbitrary position, but for easy to process, attractive in appearance, symmetrical, with the central lines preferable (as shown in Figure 2) of the cross central line and the compensating groove 12 of the pump housing 2.The degree of depth of compensating groove 13 and width can be done suitably to adjust, from practice according to the different pressures gear pump, the degree of depth of compensating groove 13 is 1/2nd of external sealed groove 14 degree of depth, it is better that width is equal to the width of external sealed groove 14, can satisfy the off-load requirement, also made things convenient for processing.

The inboard looping passage 15 of described outer close groove 14 and exterior seal ring 5, the transverse section of exterior seal ring 5 can be rectangle, circle, different shape such as trapezoidal, L shaped.Unobstructed for the high pressure oil that accumulates in exterior seal ring 5 inboards is refluxed, its transverse section is with trapezoidal, L shaped preferable.L shaped with the transverse section is example, and the both sides of the inboard breach in transverse section are isometric, all beyond seal groove 14 degree of depth 1/2nd be good, the oversize easy seal ring performance that influences.

When gear pump is worked, high pressure oil in the zone of high pressure 12 is clamp-oned the inboard of exterior seal ring 5, promptly in the annular pass 15, through compensating groove 13 high pressure oil in the annular pass 15 is introduced low pressure area 11, the interior outside pressure that makes exterior seal ring 5 is zero substantially, and no high pressure oil is let out (oozing) and leaked.

Claims

1, a kind of discharging type does not have the high pressure of leaking outside, mesohigh gear pump, comprise front and rear covers, the pump housing, master, driven gear and high and low nip and inside and outside seal ring, it is characterized in that having compensating groove (13) on the junction plane of the pump housing (2) and protecgulum (1), bonnet (3), the two ends of compensating groove (13) are communicated with low pressure area (11) and external sealed groove (14) respectively.

2, a kind of discharging type according to claim 1 does not have the high pressure of leaking outside, mesohigh gear pump, it is characterized in that compensating groove (13) can open on the pump housing (2), also can open on protecgulum (1), bonnet (3), but be arranged on the same junction plane preferable with external sealed groove (14).

3, a kind of discharging type according to claim 1 does not have the high pressure of leaking outside, mesohigh gear pump, it is characterized in that the position of compensating groove (13) on above-mentioned arbitrary junction plane, and it is preferable to coincide with the pump housing (2) cross central line.

4, a kind of discharging type according to claim 1 does not have the high pressure of leaking outside, mesohigh gear pump, it is characterized in that the degree of depth and the width of compensating groove (13), and in addition 1/2nd of seal groove (14) degree of depth, width equates with it for good.

5, a kind of discharging type according to claim 1 does not have the high pressure of leaking outside, mesohigh gear pump, it is characterized in that: with the transverse section of the exterior seal ring (5) of external sealed groove (14) looping passage (15), can be multiple shape, with trapezoidal, L shaped be good.