The balanced type crescent gear pump
The invention belongs to the hydraulic element in the mechanical industry, particularly a kind of balanced type crescent gear pump.
Crescent gear pump is because its oil sucting cavity and the bigger hydraulic coupling of pressure transition district external gear wheel; Make the axle of connection external gear and the bearing of back shaft receive big radial force; Make axle produce distortion, influence the working life of parts such as gear pump bearing, reduce the transmission accuracy and the mechanical efficiency of gear.Simultaneously because oil sucting cavity and pressure transition district also produce bigger hydraulic coupling to internal gear; Make the internal gear outer wall produce big pressure, in the high-speed rotation process, will produce violent friction like insufficient lubrication to the pump housing; The internal gear and the pump housing are glued together, cause crescent gear pump to lose efficacy.
Summary of the invention
The objective of the invention is to overcome above-mentioned technical deficiency, a kind of prolongation Pump Body Parts working life is provided, improve the transmission accuracy of gear pump and the balanced type crescent gear pump of mechanical efficiency.
The technological scheme that technical solution problem of the present invention adopts is: the balanced type crescent gear pump comprises the pump housing one, main shaft, front pump cover, end cap, rear pump cover, internal gear one, external gear one, key, locating stud, rolling bearing, sliding bearing, fixing bolt, oil sealing; Be characterized in locating stud and seal ring the pump housing two being housed fixedly in the left side of the pump housing one; External gear one and arranged on left and right sides is equidistant with key dress external gear three and external gear two on the main shaft in the pump housing one and the pump housing two; Corresponding external gear two is established internal gear two and internal gear three with external gear three in the pump housing one and the pump housing two; The width of inside and outside gear two and inside and outside gear three is 1/2nd of inside and outside gear one width, and symmetry has crescent shape static pressure support slot on the pump housing one in the zone of high pressure and the pump housing two inwalls.
The invention has the beneficial effects as follows: the balanced type crescent gear pump reduces the suffered active force of bearing through the suffered radial force of trunnion shaft, thereby prolongs part life such as bearing and improve the transmission accuracy and the mechanical efficiency of gear.And, reduce the friction between internal gear outer wall and the pump housing inwall through the suffered hydraulic coupling of balance internal gear, prevent the crescent gear pump scuffing failure.
Description of drawings
Specify with embodiment below in conjunction with accompanying drawing.
Fig. 1 is a balanced type inside engaged gear pump structure sectional view.
Fig. 2 is the A-A sectional view among Fig. 1.
Fig. 3 is the B-B sectional view among Fig. 1.
Fig. 4 is the C-C sectional view among Fig. 1.
Among the figure, the 1-fixing bolt; The 2-sliding bearing; The 3-locating stud; The 4-key; 5-internal gear one; 5-1-internal gear one bottom land hole; 6-external gear one; The 7-pump housing one; 7-1-meniscus one; 7-2-meniscus two; 7-3-static pressure support slot; The 8-rolling bearing; The 9-end cap; The 10-main shaft; The 11-front pump cover; The 12-oil sealing; 13-external gear two; 14-internal gear two; 14-1-internal gear two bottom land holes; The 15-pump housing two; 15-1-meniscus three; 16-internal gear three; 16-1-internal gear three-flute bottom outlet; 17-external gear three; The 18-rear pump cover; The 19-screw;
Embodiment, with reference to accompanying drawing 1～4, the pump housing 2 15 fixedly is equipped with locating stud 3 and seal ring in the pump housing one 7 left sides of balanced type crescent gear pump.In the pump housing 1 and the pump housing 2 15 center holes, main shaft 10 is housed with sliding bearing 2.In the pump housing 1, adorn external gears 1 with key 4 on the main shaft 10 in left side; Establish internal gear 1 in the pump housing 1 of corresponding external gear 1 with external gear one 6 engagements; Between internal gear 1 and external gear 1, establish meniscus one 7-1; Meniscus one 7-1 and the pump housing 1 are one, on internal gear 1, establish two several internal gears of row, one bottom land hole 5-1.In the pump housing 1, adorn external gears 2 13 with key 4 on the main shaft 10 on right side; The internal gear 2 14 of dress and external gear 2 13 engagements in the pump housing 1 of corresponding external gear 13; Between internal gear 2 14 and external gear 2 13, establish with the pump housing 1 and be meniscus two 7-2 of one, on internal gear 2 14, establish several internal gears of row two bottom land hole 14-1.In the pump housing 2 15, adorn external gears 3 17 with key 4 on the main shaft 10 in left side; The internal gear 3 16 of dress and external gear 3 17 engagements in the pump housing 2 15 of corresponding external gear 3 17; Between internal gear 3 16 and external gear 3 17, establish with the pump housing 2 15 and be meniscus three 15-1 of one, establish several internal gear three-flute bottom outlets of row 16-1 on the internal gear 3 16.External gear 3 17 is equidistance with external gear 2 13 with external gear one 6 left and right sides distance.Symmetry has crescent shape static pressure support slot 7-3 on the pump housing 1 in the zone of high pressure and the inwall of the pump housing 15.On the left surface of the pump housing 2 15, with locating stud 3 and seal ring dress rear pump cover 18, on the right flank of the pump housing 1, adorn front pump cover 11, forward and backward pump cover 11,18 is fastening with the pump housing 1, the pump housing 2 15 usefulness fixing bolts 1.Adorn end caps 9 with screw 19 on the main shaft 10 in front pump cover 11, and, establish rolling bearing 8 between end cap 9 and the front pump cover 11 with oil sealing 12 sealings.
The working principle of balanced type crescent gear pump be internal gear one, two, 35,14,16 and external gear one, two, 36,13,17 form three crescent gear pumps; Fluid sucks through internal gear one, two, three-flute bottom outlet 5-1,14-1,16-1 and pump intake (arrow points); 5-1,14-1,16-1 and pump discharge (arrow points) extrude from the bottom land hole again; Make and connect three external gears one, two, 36,13,17 main shaft 10 and sliding bearing 2 and rolling bearing 8 force in radial balances; Prolong the working life of bearing 2 and 8, the pump housing one two 7,15 in the zone of high pressure is opened static pressure support slot 7-3 on the inwall; High pressure oil is balanced each other to the hydraulic coupling that internal gear one, two, 35,14,16 inside and outside wall produce, thereby prevent the crescent gear pump gummed.