CN201162670Y

CN201162670Y - Dual idler gear pump

Info

Publication number: CN201162670Y
Application number: CNU200820061768XU
Authority: CN
Inventors: 詹建程; 王建
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-11
Filing date: 2008-01-11
Publication date: 2008-12-10
Anticipated expiration: 2018-01-11

Abstract

The utility model discloses a duplex internal gear pump, which comprises a pump body with an oil inlet chamber and an oil outlet chamber, a pump cover, a front and rear bearing, a transmission shaft, a small gear connected with the transmission shaft, an internal gear circle covered inside the pump body, and a crescent block. The utility model is characterized in that the oil inlet chamber is arranged along the axial direction of the transmission shaft; the front end of the transmission shaft is arranged inside the oil inlet chamber; the transmission shaft inside the oil inlet chamber is provided with an impeller so as to form a first-grade axial flow pump; as the further improvement of the utility model, the pump body is provided with a decompressed oil discharging hole communicated with an oil absorbing chamber inside the pump body and a bearing seal chamber on the rear end. The pump provided by the utility model has the advantages of strong oil absorbing and discharging capacity, less oil leakage phenomena, stable and reliable operation and long service life.

Description

The duplex crescent gear pump

Technical field

The utility model relates to a kind of inside engaged gear oil pump.

Background technique

The gear pump that generally uses has two kinds of outer gearing and interior engagements a few days ago, and the rotating speed of external gear pump can go out the oily suction in the negative pressure of vacuum container when 1000r/min is above, but can not satisfy noise≤85dB and work operates steadily, vibrates little requirement; When reducing rotating speed to satisfying noise mark Huaihe River and the work little requirement of vibration that operates steadily below the 750r/min, oil pump exist again can not suction oil defective.

Existing crescent gear pump, comprise the pump housing that has filler opening and oil outlet, pump cover, front and back bearings, transmission shaft, and the small gear of propeller shaft couplings, be sleeved on ring gear in the pump housing, be arranged at the moon block teeth between ring gear and the small gear, this structure internal gearing oil pump is at the following rotating speed of 300r/min, though can satisfy the requirement of suction oil noise≤85dB in the container of negative pressure of vacuum, but the ability of its suction oil is less, can not satisfy high suction depth more, the working condition of high viscosity lubricant medium or high vacuum negative pressure more; And when using, the high pressure oil that goes out oil pocket easily enters the rear end bearing chamber between the pump housing and the transmission shaft, damages oil sealing, and oil seepage phenomena is very general, causes frequent maintenance, becomes a difficult point of oil pump industry.

The model utility content

The purpose of this utility model is the above-mentioned deficiency at prior art, and a kind of duplex crescent gear pump is provided, and the ability that it has suction oil is strong, oil seepage phenomena is few, the advantage of work stable and reliable operation, long service life.

For achieving the above object, duplex crescent gear pump of the present utility model, comprise the pump housing that has oil suction chamber and go out oil pocket, pump cover, forward and backward bearing, transmission shaft, and the small gear of propeller shaft couplings, be sleeved on ring gear in the pump housing, be arranged at the moon block teeth between ring gear and the small gear, it is characterized in that described oil suction chamber is arranged at the axial of transmission shaft, the front end of transmission shaft is positioned at oil suction chamber, on the transmission shaft in oil suction chamber impeller is installed.

By on the transmission shaft in oil suction chamber impeller being installed, play the effect of axial-flow pump, the ability of its suction oil is significantly strengthened, can satisfy the working condition of high suction depth, high viscosity lubricant medium or negative pressure of vacuum.

As further improvement of the utility model, on the pump housing, be provided with the oil sucting cavity that is communicated with in the pump housing and the decompression draining hole of rear end bearing Seal cage; Easily enter rear end bearing chamber between the pump housing and the transmission shaft though go out the high pressure oil of oil pocket, can return in the low-pressure cavity by this draining orifice flow that reduces pressure, the protection oil sealing improves oil seepage phenomena, work stable and reliable operation, long service life.

In sum, the utlity model has that the ability of suction oil is strong, oil seepage phenomena is few, the advantage of work stable and reliable operation, long service life.

Description of drawings

Fig. 1 is the utility model embodiment's a plan view.

Fig. 2 is the A-A sectional view of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

By illustrated in figures 1 and 2, this duplex crescent gear pump, comprise the pump housing 1, pump cover 4, forward and backward bearing 5 and 6, transmission shaft 7, the small gear 8 that connects with transmission shaft 7 that have oil suction chamber 2 and go out oil pocket 3, be sleeved on ring gear 9 in the pump housing 1, be arranged at the moon block teeth 10 between ring gear 9 and the small gear 8, described oil suction chamber 2 is arranged at the axial of transmission shaft 7, the front end of transmission shaft 7 is positioned at oil suction chamber 2, on the transmission shaft 7 in oil suction chamber 2 impeller 11 is installed, on the pump housing 1, is provided with the decompression draining hole 13 that is communicated with oil sucting cavity 12 and rear end bearing Seal cage in the pump housing.

The utility model plays the effect of axial-flow pump by impeller 11 is installed on the transmission shaft 1 in oil suction chamber 2, and the ability of its suction oil is significantly strengthened; Enter the high pressure oil in the rear end bearing chamber between the pump housing 1 and the transmission shaft 7, can flow back in the oil sucting cavity 12, oil seepage phenomena is improved by decompression draining hole 13.

Claims

1. duplex crescent gear pump, comprise the pump housing that has oil suction chamber and go out oil pocket, pump cover, forward and backward bearing, transmission shaft, and the small gear of propeller shaft couplings, be sleeved on ring gear in the pump housing, be arranged at the moon block teeth between ring gear and the small gear, it is characterized in that described oil suction chamber is arranged at the axial of transmission shaft, the front end of transmission shaft is positioned at oil suction chamber, on the transmission shaft in oil suction chamber impeller is installed, has constituted the one-level axial-flow pump.

2. duplex crescent gear pump as claimed in claim 1 is characterized in that being provided with the oil sucting cavity that is communicated with in the pump housing and the decompression draining hole of rear end bearing Seal cage on the pump housing.