CN2172360Y

CN2172360Y - Middle-saeled gear pump

Info

Publication number: CN2172360Y
Application number: CN 93213679
Authority: CN
Inventors: 程安强
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-27
Filing date: 1993-05-27
Publication date: 1994-07-20
Anticipated expiration: 2003-05-27

Abstract

The utility model relates to a middle-sealed gear pump. Two flanks of the driving gear and the driven gear of the gear pump are provided with side plates which can axially float and shaft sleeves supporting gear shafts, and the back sides of the side plates are provided with channels. The channels are provided with sealing devices so as to cause high-pressure media in the pump to be sealed between the two side plates, and a front cover and the pump body are positioned by utilizing the steps of the shaft sleeves. Thus, the stress of the pump body is reduced (The stress of the pump body can be usually reduced by 1/2 to 1/3). The middle-sealed gear pump becomes a high pressure gear pump which has simple, reasonable and advanced structure, good manufacturability, low cost and reliable use.

Description

Middle-saeled gear pump

The utility model relates to a kind of gear pump, a special middle part sealed type gear pump.

Utility model patent " middle part nose balance sealing the gear pump " patent No. be 902044699 proposed a kind of with the structural type of high pressure sealing at the outer gearing high-pressure gear pump at pump chamber middle part, the sealed groove of the middle part nose balance sealing of the high-pressure gear pump of this structure is arranged on the axle sleeve, because pump axle sleeve when making assembling is loaded onto after being, so the assembly manipulation difficulty of Sealing.Secondly, because sealed groove opens on axle sleeve, the difficulty in the technological management the when branch about axle sleeve just has causes the size grouping assembling that need carry out by bearing aperture is for the quality of fit that improves between bearing hole and the gear diameter of axle generally adopts grouping to assemble.Cause the quality and the sealing reliability of gear pump to be difficult for guaranteeing for above-mentioned reasons.Moreover, adopt the pin location, the position accuracy demand height, processing and manufacturing difficulty is big, is unfavorable for the production and the manufacturing of gear pump.

The purpose of this utility model is improved the gear pump that existing middle part nose balance seals, eliminate the deficiency of its existence, easily operation and control of the manufacturing that a kind of pump is provided, the sealing of pump and quality is easy to guarantee, helps reducing the middle part sealed type gear pump of the manufacture cost of pump.

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

The pump case of forming by protecgulum (1), the pump housing (2), bonnet (3), pump housing inner chamber is the figure of eight (8,9), driving gear shaft (10,11,12) wherein is housed, driven gear shaft (13,14,15), side plate (22,23), reach four axle sleeves (16), (17), (18), (19), the small stair (21) of axle sleeve (6) protrudes from outside the pump housing, as with the location of protecgulum, saved pin positioning means of the prior art.The side plate one side of gear dorsad has the groove (29,30,31) of the figure of three, and the seal arrangement that can form the pressurising duct is housed in the groove.Like this, reduced the pressure that the pump housing bears significantly, compared with the gear pump of general non-middle part sealing and can reduce 1/2-1/3 thereby the seal arrangement in the side plate groove is enclosed in pump housing middle part with high-pressure medium.Improvement in the side plate figure of three groove seal arrangement, the pressurising medium pressure stability is arranged is sent in the whole figure of three groove, thereby obtains a stable axial hydraulic equilibrant force.Because no longer have groove on the axle sleeve, the structure of four axle sleeves is identical to be a kind of part, therefore, just be easy to aborning implement the grouping assembling, for quality of product improves the condition of having created by being fitted in the also footpath grouping of axle sleeve middle (center) bearing.

Accompanying drawing is embodiment of the present utility model, further specifies the utility model below in conjunction with accompanying drawing.

Fig. 1 is the longitudinal sectional view of middle part sealed type gear pump.

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

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

Fig. 4 is that A among Fig. 1 is to enlarged view.

As Fig. 1, Fig. 2, shown in Figure 3, the pump case of middle part sealed type gear pump system is formed, and is fastenedly connected into an integral body by bolt (4) by protecgulum (1), the pump housing (2), bonnet (3).The two ends of the pump housing have groove (5), (6) and place seal ring (7), prevent external leakage between gear pump.The inner chamber of the pump housing is an inner chamber by the figure of eight shape of circular inner hole (8) and circular inner hole (9) stack formation, in this inner chamber, be equipped with: by the driving gear shaft of the axle journal (11) at driving gear (10) and two ends thereof, a integral body that (12) are constituted, driven gear that is meshed with driving gear (13) and two ends axle journal (14) thereof, (15) constitute the driven gear shaft of an integral body, and axle journal (11), (12) and (14), (15) are supported by axle sleeve (16), (17) and (18), (19) respectively.Axle sleeve (16), (17), (18), (19) have identical structure, are all press-fiting bearing (20) in the endoporus.The small stair (21) of axle sleeve (16) stretches in protecgulum and the hole that it matches, plays protecgulum and pump housing positioning action.Be positioned at the gear both sides in the inner chamber of pump side plate (22) and the side plate (23) that profile and pump housing figure of eight inner chamber match also is housed, driving gear shaft stretches out outside the pump case along the axle head (24) that axle journal (11) prolongs, so that connect mutually with the power source of outside.When driving gear (10) drive driven gear (13) under the drive of gear pump at power source turns round by direction shown in Figure 2, suck medium from import (25), obtain pressure through gear engagement squeezing action medium and discharge from exporting (26).Low-pressure cavity (27) and hyperbaric chamber (28) have been formed in the pump inner chamber.Side plate (22) and side plate (23) structure be the same be a kind of part, its back side (promptly rely on gear one side reverse side) all have from central division position (29) by hyperbaric chamber one side along the side plate outer rim to groove (30), (31) that low voltage side is extended, groove extends to two Gear center O1, O2 and is wired to the groove that place, α angle (the α angle is generally about 60 °) forms a kind of symmetrical figure of three shape.The seal arrangement that matches with groove shape is housed in the groove, and seal arrangement is to be rectangular cross section by a kind of as shown in Figure 4 hollow periphery of section configuration.The section configuration that global shape shields by the rubber ring (32) of the figure of three with to the rubber ring thick global shape of intermediate thin periphery as shown in Figure 4 is that the plastic cement of the figure of three is made back-up ring (33) and formed equally.Rubber ring and back-up ring in the groove of side plate of packing into after, formed figure of three shape pressurising duct (34), (35), (36) that are communicated with hyperbaric chamber (28).The translateral pressurising of medium duct (34) when oil pump is worked in the hyperbaric chamber (28), (35), (36) are arrived the propagation of pressure of medium in the groove of side plate (22) and side plate (23) respectively, formed nose balance power, overcome below the side plate axial separation force that the one side of gear face (promptly by) caused by high-pressure medium, two blocks of side plates are close to respectively on the gear both ends of the surface, keep the axial float compensation sealing of gear pump.

Be not difficult to find out from above-mentioned narration, the groove of the figure of three is opened on side plate, helped assembling (gear pump assembling the time must be side plate is installed earlier then axle sleeve is installed) structure.Profile is that the rubber ring and the groove of the figure of three fits like a glove, and rubber is that a kind of flexible material can make nose balance power stable with the propagation of pressure of medium in whole groove, can improve the up-to-standard rate of product.Aforementionedly having illustrated that the structure of four axle sleeves is the same, is with a kind of part, and the branch about not having can be realized the grouping assembling of bearing so easily, improves the quality of bearing and the quality of fit assurance product of axle journal.Utilizing axle sleeve to have reduced for protecgulum and pump housing location has the positioning dowel of high precision position requirement structure, has improved the product technology capability and has reduced cost.Seal arrangement on the side plate in whole figure of three groove and the groove is enclosed in the middle part (the A section of Fig. 1) of the pump housing with high-pressure medium, and Fig. 1 middle pump body B section C section no longer is subjected to the pressure of high-pressure medium, and it is stressed to have alleviated the pump housing.

Claims

1, a kind of middle part sealed type gear pump, comprise protecgulum (1), the pump housing (2), the pump case that bonnet (3) constitutes, pump housing inner chamber is the figure of eight, intermeshing master is housed in the inner chamber, driven gear (10), (13), it is bearing in the axle sleeve (16) that bearing is housed respectively, (17), (18), (19) on, it is characterized in that, leading, but the profile that matches with pump housing cavity shape that axial float is equipped with in the driven gear both sides is figure of eight side plate (22), (23), the back side of side plate all has from central division the position and stretches out along side outside plate edge and constitute the groove (29) that is shaped as the figure of three, (30), (31), the seal arrangement that the assembling back forms the pressurising duct is housed in the groove, and the pressurising duct is communicated with hyperbaric chamber.

2, by the described gear pump of claim 1, the figure of three groove two end part that it is characterized in that the said side plate back side are to extend a α angle along the side plate outer rim to low voltage side by the high pressure side from driving and driven Gear center symmetry.

3,, it is characterized in that described seal arrangement is that the plastic cement catch (33) and the cross section of the peripheral thick intermediate thin that matches with groove figure of three shape is that hollow is constituted along the peripheral rubber ring (32) by rectangular cross section of the figure of three by the described gear pump of claim 1.

4,, it is characterized in that the protecgulum and the pump housing are stretched in the hole that protecgulum matches by the small stair (21) that is contained in the axle sleeve (16) in the pump housing inner chamber to position by the described gear pump of claim 1.

5,, it is characterized in that axle sleeve (16), axle sleeve (19), axle sleeve (18), axle sleeve (19) structure are identical by the described gear pump of claim 1.