CN2064832U

CN2064832U - Middle axial compensationally sealed gear pump

Info

Publication number: CN2064832U
Application number: CN 90204469
Authority: CN
Inventors: 程安强
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-04-13
Filing date: 1990-04-13
Publication date: 1990-10-31

Abstract

The utility model discloses a middle axial compensated sealed gear pump belonging to an externally meshed gear pump. Both sides of a main gear and a driven gear are provided with axially floated side boards, and an axial compensated seal is arranged between the side board and a shaft sleeve to form a middle axial compensated seal. The high pressure in the middle axial compensated sealed gear pump is sealed in the center of the pump body, the radial pressure function forced by the pump is greatly reduced, and generally the radial pressure function can be reduced 1/2 to 1/3, so the pump body generally can be manufactured by the casting technique. The middle axial compensated sealed gear pump has the advantages of high reliability, light weight, small size and low cost, so the utility model can further raise the pressure of the middle axial compensated sealed gear pump.

Description

Middle axial compensationally sealed gear pump

The utility model relates to a kind of gear pump, particularly a kind of outer gearing high-pressure gear pump of nose balance sealing.

In the prior art, the lead alloy pump housing that is easy to sweep thorax is normally adopted in the gear pump radial seal.Along with the raising of gear pump pressure, the pressure that the pump housing bears also strengthens thereupon, and how body intensity also requires to improve to satisfy requirement of strength thereupon.The method that improves the common employing of pump housing intensity is to strengthen pump housing thickness or forge the complicated technology making pump housing of a class with liquid, and to the volume increase that makes pump, the manufacture cost of pump raises.And be in the axle sleeve type outer gearing high-pressure gear pump of " 8 " shape in the pump chamber structure, but the sealing of the nose balance of the axle sleeve of axial float then is the junction that is contained in axle sleeve and front and rear covers, promptly is in pump housing two ends.The pump inner high voltage can make axle sleeve be subjected to radial compression applied, and then make pump housing pressurized along pump chamber to the two ends diffusion that stretches.The pressure of gear pump is high more, and the pressure that the pump housing bears is big more, and is also high more to pump housing requirement of strength.For this reason, just must strengthen pump housing wall thickness or adopt liquid to forge class technology manufacturing body, still adopting these methods to improve pump housing intensity has certain limit, and therefore further the pressure of raising gear pump is quite difficult.Also make simultaneously the manufacturing of high-pressure gear pump become quite difficult, the manufacture cost of pump significantly improves.Further improving the pressure of gear pump, reduce the manufacture cost of high-pressure gear pump, is the problem that people are on tiptoe solution with the usage requirement of satisfying constantly development.

The purpose of this utility model is to existing gear pump shaft envelope, particularly pump chamber for " 8 " but the sealing of the nose balance of the axle sleeve of the axial float of the outer gearing high-pressure gear pump of shape improved, provide a kind of pump housing can adopt general casting technique manufacturing, cost is low, can reduce the gear pump of the middle part nose balance sealing of pump housing pressurized significantly.

The purpose of this utility model realizes in the following manner.

By the pump housing (2), protecgulum (1), bonnet (3) and driving gear (10), the pump chamber structure that driven gear (11) constitutes is the master of " 8 " shape outer gearing high-pressure gear pump, but the both sides of driven gear dress adds coincideing with the pump chamber shape of axial float, " 8 " the shape side plate (27) that adapts to, (28), driving gear shaft axle sleeve (16), (17) and driven gear shaft axle sleeve (22), (23) on the end face of side plate one end, have from two axle sleeve center symmetries along the outward extending groove of axle sleeve outer rim (29), (31) reach (30), (32), groove (29), (31) and groove (30), (32) " 3 " shape groove of two symmetrical distributions of formation.The seal arrangement that has the pressurising duct after the assembling is housed in " 3 " shape groove, and the pressurising duct is communicated with the high pressure side pump chamber.

Two groove ends of " 3 " shape groove of two symmetrical distributions are that symmetrical line extends a α angle along two axle sleeve outer rims to low voltage side by the high pressure side from the main driven gear shaft line of centres that divides, to realizing that the purpose of this utility model is favourable.

But the utility model provides a kind of and has adorned the gear pump that adds nose balance sealing configuration form at the side plate that axial float is set near driving and driven gear both sides at side plate and shaft room, makes the nose balance sealing of gear pump move on to the middle part by pump housing two ends.Pump inner high voltage medium is sealed in pump housing central authorities under the seal arrangement sealing, thereby has reduced the pressure that the pump housing bears significantly.Compare with existing gear pump, can reduce 1/2-1/3.Thereby the pump housing can adopt general casting technique to make, and has reduced the manufacture cost of pump.Simultaneously, pump housing wall thickness can reduce, and the volume of gear pump is reduced.Because pump housing pressurized reduces greatly, thereby can further improve the pressure of gear pump.Secondly, the pump inner high voltage can along the diffusion of pressurising duct seal arrangement pressurized, seal arrangement tensioning are attached on groove and the side plate and with the interface of junction obturage, closely knit, improved sealing reliability greatly, reduced the leakage phenomenon generation.

Accompanying drawing is example structure figure of the present utility model, below the structure accompanying drawing further specify the utility model.

Fig. 1 is the gear pump longitudinal sectional view of middle part nose balance sealing.

Fig. 2 is II among Fig. 1-II sectional view.

Fig. 3 is III among Fig. 1-III sectional view.

Fig. 4 is an A portion partial enlarged drawing among Fig. 1.

Fig. 5 is the seal arrangement cross section partial enlarged drawing of another kind of structural type.

As Fig. 1, Fig. 2, shown in Figure 3, the pump case of the outer gearing high-pressure gear pump of middle part nose balance sealing is made of the pump housing (2), protecgulum (1), bonnet (3), and the pump housing is located by pin (4) with lid, is fastenedly connected whole by clamping bolt (5).There are sealing (6), (7) to leak between the pump housing and forward and backward lid to prevent pump case." 8 " the shape pump chamber that has circular inner hole (8) and (9) stack to constitute in the pump housing, driving gear (10) and be loaded in the pump chamber with the driven gear (11) of its outer gearing.The axle sleeve (16), (17) that have bearing (14), (15) are housed on driving gear wheel shaft shaft part (12), (13), the axle sleeve (22), (23) that have bearing (20), (21) are housed on driven gear wheel shaft shaft part (18), (19), and driving and driven gear can turn round therein.Driving gear shaft part (24) stretches out pump case, so that connect with power source.The gear pump revolution, medium is entered in the pump by import (25), forms high-pressure medium by outside outlet (26) excavationg pump under the engaging gear extruding.But " 8 " the shape side plate (27) and (28) that coincide, adapt to the pump chamber shape that axial float is equipped with in driving and driven gear both sides, the biside plate symmetric arrangement.Axle sleeve (16), (22) and axle sleeve (17), (23) have on the end face of side plate one end from two axle sleeve centers symmetries along the outward extending groove of axle sleeve outer rim (29), (31) and groove (30), (32), " 3 " shape groove of groove (29), (31) and groove (30), two symmetrical distributions of (32) formation.(be " 3 " shape groove that groove (30), (32) constitute shown in Fig. 3, " 3 " shape groove that (29), (31) constitute is identical with it.Two groove ends of " 3 " shape groove prolong a α angle from the high pressure side along two axle sleeve outer rims to low voltage side by O1, O2 symmetrical line place, and the α angle is generally 60 °." 3 " the shape seal arrangement that coincide with groove shape is arranged in the groove.A kind of structural type of seal arrangement is as shown in Figure 4, and the cross section of being made by plastic cement is " 3 " shape ring washer (35), (36) of U-shaped and is loaded on rubber ring (33), (34) formation that the interior cross section of ring washer is a U-shaped.Ring washer, rubber ring and side plate assemble the back and form " 3 " shape pressurising duct that is communicated with the high pressure side pump chamber, and " 3 " shape pressurising duct that (29), (40), (41) constitute among Fig. 3 is the interior pressurising duct of " 3 " shape groove that groove (30), (32) constitute.The dead slot (37) that high pressure side pump chamber mesohigh medium (being generally oil) is located to have by high pressure one side (38) on the side plate (28) flows to duct (39) and locates and then enter duct (40), (41) and locate and be full of the duct, and rubber ring is exerted pressure overlays on ring washer the rubber ring tensioning.Ring washer overlay on the groove cell wall with the separating surface between axle sleeve and pump chamber (42), (44), (43), (45), the link surface between axle sleeve and the side plate (46), (47) closely knit sealing, thus prevented spilling of medium.Simultaneously, high-pressure medium is enclosed between gear and two side plates, the axle sleeve radial force is reduced significantly, thereby make that the pump housing is stressed to be reduced greatly.Because the full high-pressure medium of rubber ring inner duct light, therefore two side plates are near two sides of driving and driven gear, thus the nose balance sealing that has kept gear pump.

The another kind of structural type of seal arrangement as shown in Figure 5, the side-walls device cross section relative with side plate with groove is plastic cement catch (48), (50) of " 3 " shape of peripheral thick intermediate thin at the side plate place, the rubber ring (49) that other two the relative side-walls device cross sections of groove between two catch are rectangle, the centre surrounds pressurising duct (51), the duct is communicated with the high pressure side pump chamber, at high-pressure medium extruding lower stop piece, rubber ring overlays on the groove wall, makes separating surface (42), (46) closely knit sealing.

Claims

1, a kind of gear pump, particularly a kind of outer gearing high-pressure gear pump of nose balance sealing, include by the pump housing (2), protecgulum (1), the pump chamber that bonnet (3) constitutes is the pump case of " 8 " shape, be arranged in the master of the mutual outer gearing of pump chamber, driven gear (10), (11), main, be bearing in the axle sleeve (16) that bearing is housed from gear shaft, (17) reach (22), (23) on, it is characterized in that main, but coincideing with the pump chamber profile of axial float is equipped with in the driven gear both sides, " 8 " the shape side plate (27) that adapts to, (28), axle sleeve (16), (22) reach (17), (23) on the end face of side plate one end, have from two axle sleeve center symmetries along the outward extending groove of axle sleeve outer rim (29), (31) reach (30), (32) groove (29), (31) and groove (30), (32) " 3 " shape groove of two symmetrical distributions of formation, the seal arrangement that has the pressurising duct after the assembling is housed in " 3 " shape groove, and the pressurising duct is communicated with the high pressure side pump chamber.

2,, it is characterized in that two groove ends of said " 3 " shape groove extend a α angle along two axle sleeve outer rims to low voltage side by high pressure from driving and driven gear shaft line of centres symmetry by the described gear pump of claim 1.

3, by the described gear pump of claim 1, it is characterized in that said seal arrangement by coincideing with groove shape, cross section is that plastic cement back-up ring (35), (36) of U-shaped and the cross section that is loaded in the ring washer are " 3 " shape rubber ring (33), (34) formation of U-shaped.

4, by the described gear pump of claim 1, it is characterized in that said seal arrangement by coincideing with groove shape, cross section is plastic cement catch (48), (50) of peripheral thick intermediate thin and to be loaded on cross section between two catch be that the rubber ring (49) of rectangle constitutes.