SU1211456A1 - Gear pump - Google Patents

Description

2. Ilacoc on i.1, about tl and h and y - w, and with the fact that the camera is pressing

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The invention relates to mechanical engineering, in particular, to izhesteny pumps.

The purpose of the invention is to increase the resource and volumetric efficiency.

Pa figs. 1 shows a gear pump, a longitudinal section; FIG. 2 is a section A-L of FIG. one; FIG. 3 shows a section BB in FIG. one,

The gear pump comprises a housing 1 with an end cap 2 and a bottom 3, in cylindrical bores 4 of which external gearing gears 5 and movable fixed 7 compensators of end gaps are located, working lateral surfaces 8 of compensators are coupled with the ends of 9 gears 5, and the preload chamber 10, The lateral surface 11 of the displacements of the compensators 6, the surface 12 of the horizontal bores 4 by the II bottom 3, the chambers are connected to the channel I 13 and 14 with the high-pressure cavity 15 and the suction cavity 16, and in the channel 13 connecting the pressurized measure 10 with a high-pressure cavity 15, a constant choke 17 is installed, and channel 14 13 connects the chamber 10 of the core to the suction cavity 16, an adjustable choke 18 is installed, while the housing 1 is provided with annular grooves 19, made in the place of conjugation of cylindrical The bore 4 with the bottom 3 and the suction cavity 10 connected to the chambers 10 and the suction cavity 16, the throttles of the adjustable throttles 18 are formed by the outer radial edge 20 not working 1 1, the mobile compensators 6 end gaps II of the outer radial The second edge 21 of the end surface 22 of the bottom 3, which is located on the side of the partition, is divided into parts by means of split sections and separated partitions.

Terrain 5, and the chambers 10 of the pressing are separated by a portion of the radial podpruzheni1 baffles 23.

The gear pump works in the following way.

When the external gearing gears 5 are screwed, the working fluid is captured by the teeth of the gears 5 and is transferred from the suction cavity 16 to the high pressure cavity 15. At the same time, the working fluid under pressure enters the pre-compression chamber 10 and compresses the movable expansion joints

6 end gaps to the ends of 9 gears 5. In this case, the pressure of the working fluid in the pressure chambers 10 is determined by the ratio of the areas of the flow sections of a constant

throttle G / and adjustable throttle --h 18. When assembling a gear pump, the size of the flow area of the adjustable throttle 18. is provided in such a way that

The pressure of the working fluid in the pre-pressure chambers 10 was somewhat higher than the optimum pressure. In this case, when the gear pump is run-in due to a large preload of the compensators 6 and 7 of the end clearances to the ends of the 9 gears 5, intense wear of the movable compensators of the end clearances is observed, as a result of which the flow cross section

adjustable throttle 18 is increased, and the pressure of the working fluid in the pre-pressure chambers 10 drops. With

Thereby, the pressure of the working fluid drops until the pressure of the compensators 6 and 7 of the end gaps reaches the optimum value at which their wear is sharply slowed down.

6 13

15

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eleven

23

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Fig.Z

Editor E. Kopcha

Order 2009 Circulation 586 Subscription

VNIIPI USSR State Committee

PS cases of inventions and discoveries 113035, Moscow, Zh-35, Raushsk Pub., D. 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Compiled by V. Sharypov Tehred I. Boikalo

Proofreader A.T. sko

Claims (2)

1. A gear pump, comprising a housing with an end cap and a bottom, in cylindrical bores of which external gears and movable and fixed compensators for end clearances are placed, the working side surfaces of the compensators are conjugated with the ends of the gears, and the pressure chambers formed by the non-working side surface of the movable 'compensators, the surface of the cylindrical bores and the bottom, the chambers are connected by channels with a high-pressure cavity and a suction cavity, in the channel connecting the pressure chamber with a high cavity constant pressure, a constant choke is installed, and an adjustable choke is installed in the channel connecting the pressure chamber to the suction cavity, characterized in that, in order to increase the resource and volumetric efficiency, the casing is equipped with annular grooves made at the interface between the cylindrical bores and the bottom and connected with chambers for compression and a suction cavity, the throttling edges of the adjustable throttle are formed by the outer radial edge of the non-working surface of the movable end-face compensators and the outer radial Romka bottom end face surface located side gears. SU „„ 1211456> 2. A pump according to and. 1, it follows that the pressure chambers are divided into parts by radial spring-loaded partitions.