CN202082096U

CN202082096U - Gear pump

Info

Publication number: CN202082096U
Application number: CN 201120180365
Authority: CN
Inventors: 谭伟明; 梁燕飞; 袁庆丹
Original assignee: Foshan University
Current assignee: Foshan University
Priority date: 2011-05-31
Filing date: 2011-05-31
Publication date: 2011-12-21
Anticipated expiration: 2021-05-31

Abstract

A gear pump comprises a pump body, a pump cover, gears and a connection fastening part, and is characterized in that three operation gears which are identical three-order elliptic gears are contained in three hollow cavities correspondingly arranged on the pump body and sequentially and mutually meshed. An oil absorption cavity and an oil discharge cavity are formed on two sides of the upper portion of a central gear, another oil discharge cavity and another oil absorption cavity are formed on two sides of the lower portion of the central gear, the oil absorption cavity on the upper portion of the central gear is communicated with the oil absorption cavity on the lower portion of the central gear and an oil inlet of the pump, the oil discharge cavity on the upper portion of the central gear is communicated with the oil discharge cavity on the lower portion of the central gear and an oil outlet of the pump, and tooth amount of the three three-order elliptic gears is in accordance to 6n+3 (n refers to positive integers). Compared with the prior art, the gear pump has the advantages that discharge capacity can be effectively improved while oil trapping and output flow fluctuation can be reduced.

Description

A kind of gear pump

Technical field

The utility model relates to a kind of gear pump that uses 3 three rank elliptic gears as working gear.

Background technique

Gear pump is a kind of positive displacement metering pump, and it is simple in structure, suction capacity is strong,, easy maintenance insensitive to oil contamination, but its discharge capacity is generally smaller.The modulus of ordinary gear pump delivery and its working gear square is directly proportional, and under the prerequisite that the volume of pump remains unchanged, the modulus that increases working gear can increase pump delivery, but will correspondingly reduce the number of teeth.The existence of Undercutting Phenomenon has limited the minimum teeth number of gear, and therefore this method is very limited for the effect that increases discharge capacity.In addition, also there is the unfavorable factor of what is called " pocketed oil " in gear pump, and the pocketed oil amount also is and square being directly proportional of modulus, and also can increase the pocketed oil amount when promptly relying on increasing modulus to increase discharge capacity, and this has just limited the performance improvement of gear pump.

Summary of the invention

Goal of the invention of the present utility model be to provide a kind of can effectively increase discharge capacity, alleviate entrap phenomenon, reduce the gear pump of output flow fluctuation.

The utility model is achieved in that and comprises the pump housing, pump cover, gear, connection fastening piece, and its specialization is: working gear has three, and the corresponding pump housing is provided with three gear cavities, and three gears all are three rank elliptic gears, and the quantity of tooth is 6 on the gear n+ 3( nBe positive integer).Three working gears are meshing with each other successively, what be positioned at central authorities is called central gear, about two gears be called the side wheel, they are meshed with central gear, both sides, top at central gear form oil sucting cavity and oil-discharging cavity, form oil-discharging cavity and oil sucting cavity on the both sides, bottom of central gear.The oil sucting cavity of the oil sucting cavity on central gear top and central gear bottom is connected, and the bottom oil-discharging cavity of the oil-discharging cavity on central gear top and central gear is connected.During work, if central gear turns clockwise the upper left side oil suction of central gear, lower-left side oil extraction; The upper right side oil extraction, the right lower side oil suction.Be in two suctions, the oil-discharging cavity about central gear of being positioned at of upside together, and two suctions, the oil-discharging cavity about central gear of being positioned at that is in downside together, all must rely on the shape of central gear self to guarantee to isolate, the condition of this isolation depends on the exponent number and the eccentricity of elliptic gear, and exponent number is higher than 3 elliptic gear can satisfy this requirement.Two oil sucting cavities are connected with pipeline and are communicated with the filler opening of pump, and two oil-discharging cavities also are connected with pipeline and are communicated with the oil outlet of pump.During the engagement of central gear and side wheel, when a side pole of central gear directly increases, the utmost point footpath of opposite side should reduce just, produces the effect of compensation mutually, can reduce the fluctuation of output flow.Like this, central gear should be that exponent number is odd number and satisfies 6 n+ 3( nBe positive integer) elliptic gear.

Central gear is that exponent number is the elliptic gear of odd number, i.e. three rank, five rank ..., but the above elliptic gear in five rank is easy to generate indent, and manufacture difficulty is greater than three rank elliptic gears.Two side gears can not be three rank elliptic gears in theory, but the specification kind of gear increases and is unfavorable for making.Therefore, make for convenience and use, the exponent number of the oval pitch curve of 3 gears all is to be taken as three rank.

The utility model compared with the prior art, having can effectively increase discharge capacity, alleviates entrap phenomenon, reduces the advantage of output flow fluctuation.

Description of drawings:

Fig. 1 is an of the present utility model structural representation that shows the end profile of gear;

Fig. 2 is gear face shape figure.

Embodiment:

Now in conjunction with the accompanying drawings and embodiments the utility model is done and is described in further detail:

As shown in the figure, the utility model comprises the pump housing 1, pump cover, gear 4, connects fastening piece, and its specialization is that gear 4 has three, and the corresponding pump housing 1 is provided with three gear cavities 3, three gears 4 all are three identical rank elliptic gears, and the quantity of tooth is 6 on the gear 4 n + 3, nBe positive integer.Three gears 4 are meshing with each other, both sides, top at central gear 2a form oil sucting cavity 5a and oil-discharging cavity 6a, both sides, bottom at central gear form oil-discharging cavity 6b and oil sucting cavity 5b, the bottom oil sucting cavity 5b of the oil sucting cavity 5a on the top of central gear 2a and central gear 2a is connected, and the bottom oil-discharging cavity 6b of the oil-discharging cavity 6a on the top of central gear 2a and central gear 2a is connected.

Claims

1. gear pump, comprise the pump housing, pump cover, gear, connect fastening piece, it is characterized in that working gear has three, all be three identical rank elliptic gears, the relevant position is provided with 3 cavitys and holds working gear on the pump housing, three working gears are meshing with each other successively, both sides, top at central gear form oil sucting cavity and oil-discharging cavity, both sides, bottom at central gear form oil-discharging cavity and oil sucting cavity, the bottom oil sucting cavity of the oil sucting cavity on the top of central gear and central gear is connected and is communicated with the filler opening of pump, the bottom oil-discharging cavity of the oil-discharging cavity on the top of central gear and central gear is connected and is communicated with the oil outlet of pump, and the number of teeth of 3 three rank elliptic gears satisfies 6 n+ 3, nBe positive integer.