RU115840U1 - GEAR PUMP WITH REDUCED PRESSURE REDUCTION - Google Patents

Abstract

A gear pump with reduced pressure pulsation, containing a housing, a cover, a driving and a driven gear, the housing has a chamber connected to the discharge cavity, a plunger is installed in the chamber, compressed by a spring with the possibility of translational movement inside the chamber, characterized in that the housing includes two leading and two driven gears, wherein the driving gears are paired with each other and the teeth of one of them are offset relative to the other by half the pitch between the teeth.

Description

The utility model relates to mechanical engineering, in particular to volumetric hydraulic machines and can be used in hydraulic machines.

A known gear pump with a passive vibration damper (Patent No. 104257, IPC F04C 2/18), comprising a housing, a cover, a drive and a driven gear, the housing has a chamber connected to the discharge cavity, a plunger installed in the chamber, preloaded by a spring with the possibility of translational movement inside cameras.

The disadvantages of this utility model include the uneven supply of the working fluid, which varies according to the epicycloidal dependence.

The problem the utility model aims to solve is to reduce fluctuations in the supply of working fluid.

The technical result, which is achieved through the use of the proposed utility model, is to increase the reliability of hydraulic systems, reducing the likelihood of resonance oscillations in the pressure line of hydraulic systems.

The specified technical result is achieved in that the gear pump with reduced pressure pulsation, comprising, a housing, a cover, a drive and a driven gear, the housing has a chamber connected to the discharge cavity, a plunger is installed in the chamber, preloaded by a spring with the possibility of translational movement inside the chamber, in addition , the housing includes two driving and two driven gears, and the driving gears are paired with each other and the teeth of one of them are offset relative to the other by half a step between the teeth.

Figure 1 shows a gear pump with reduced pressure pulsation. Figure 2 - view aa the first stage of the gear pump and view bb of the second stage. Figure 3 presents a graph of pressure pulsations, respectively: a) pressure pulsation from the first stage of the pump; b) pressure pulsation from the second stage of the pump; c) the total pressure pulsation from both stages.

The device consists of a housing 1, a front cover 2, a rear cover 3, in the housing 1 on the bushings 4-7 and 8-11, respectively, driving gears 12, 13 and driven gears 14, 15 are mounted, covered on all sides by the walls of the housing 1 with small gaps. The pinion gear 12 is made integrally with the shaft 16, and the pinion gear 13 with the shaft 17, and the shaft 16 is rigidly connected to the shaft 17 so that the pinion gears 12, 13 are paired with one another and the teeth of one of them are half offset pitch between the teeth. To prevent fluid leakage between the housing 1 and the shaft 16, a sealing seal 18 is installed. In the housing 1 (FIG. 2, view A-A), there are suction holes 19 and 20 for discharge, respectively connected to the suction 21 and 22 discharge cavities. A cylindrical chamber 23 is made in the housing 1 and is connected directly to the injection cavity 22. A plunger 24 is installed in the chamber 23, the spring 25 is held by a plug 26, in which a throttle hole 27 is made for air bypass.

The device operates as follows.

When the gears 12 and 13 rotate clockwise, the gears 14 and 15 rotate counterclockwise. The fluid from the suction cavity 13 is captured by the teeth and transferred into the interdental space of the gears into the injection cavity 22, from where the fluid under pressure enters the chamber 23. The uneven involute engagement of the gears causes pulsations in the fluid supply and pressure pulsations in the injection cavity 22 and, accordingly, the chamber 23 connected to it. When a surge in the supply of working fluid and pressure in the chamber 23, the plunger 24, compressing the spring 25, moves down (figure 1), increasing the volume of the injection cavity 22 by an amount equal to am litude pulsations supplying the working fluid. Moving downward, the plunger 24 displaces air from the subplunger space through the throttle hole 27 in the plug 26, thereby partially damping. When the pulsation of the supply of the working fluid decreases, the plunger 16 under the action of the restoring force of the spring 25 returns to its original position. With periodic fluctuations in the flow of the working fluid, changing according to the epicycloidal law, the plunger 24 also oscillates, thereby the working volume of the injection cavity is constantly changing by the amount of pulsation, which results in a constant supply of working fluid at the outlet from the injection opening 20.

When the gears of the first stage rotate (Fig. 2, view A-A), the pulsation of the working fluid supply changes according to the law (Fig. 3a), the second stage - gears 13, 14 feed the working fluid into the pressure cavity 22 according to (Fig. 3b) . Since both stages feed into one cavity 22, the law of pressure change in the injection cavity 22 will look like a diagram (Fig. 3c).

Thus, the utility model is designed to reduce fluctuations in the flow of the working fluid and reduce vibrations in the hydraulic system and increase its reliability.

Claims (1)

A gear pump with reduced pressure pulsation, comprising a housing, a cover, a drive and a driven gear, the housing has a chamber connected to the discharge cavity, a plunger is installed in the chamber, spring-loaded with the possibility of translational movement inside the chamber, characterized in that the housing includes two leading and two driven gears, the drive gears being paired with each other and the teeth of one of them offset relative to the other by half a step between the teeth.