CN203835710U

CN203835710U - Improved NCB internal gear pump

Info

Publication number: CN203835710U
Application number: CN201420231579.8U
Authority: CN
Inventors: 虞益峰; 王佳
Original assignee: Jiangsu Hongliu Chemical Machinery Co Ltd
Current assignee: Jiangsu Hongliu Chemical Machinery Co Ltd
Priority date: 2014-05-07
Filing date: 2014-05-07
Publication date: 2014-09-17
Anticipated expiration: 2024-05-07

Abstract

The utility model discloses an improved NCB internal gear pump. The improved NCB internal gear pump comprises a pump body, a pump cover, a seal base, an outer rotor, an inner rotor, a pump base and a main shaft, wherein the inner rotor is meshed with the outer rotor; the main shaft is fixed by bearings; the outer rotor and the inner rotor are arranged in a cavity consisting of the pump body, the pump cover and the seal base; the outer rotor is fixed by the main shaft; the seal base is arranged at the front end of the main shaft, and is fixed on the pump base; a mold line of a gear of the outer rotor is circularly opened; the mold line of a gear of the inner rotor is of a curtate cycloid shape; the gears of the inner rotor and the outer rotor are in linear contact. The improved NCB internal gear pump provided by the utility model has sufficient scientificity; in the conveying process, because the design principle of a curtate cycloid is adopted, the internal and external gears are always in linear contact; the pressure of the pump is stable; the internal leakage amount is reduced obviously; the noise is lowered obviously; the loading operation for a long time can be carried out, and the improved NCB internal gear pump is durable.

Description

A kind of follow-on NCB crescent gear pump

Technical field

The invention belongs to machinery field, be specifically related to a kind of follow-on NCB crescent gear pump.

Background technique

Gear pump is as the visual plant of carrying in producing, in industries such as oil, chemical industry, food, be widely used, the flute profile design of traditional crescent gear pump is to rotate resulting two gear relative movement according to interior circular arc, reaches vacuum effectiveness, completes transportation work.

There is the defect of following several respects in traditional flute profile:

1, the surface of contact gap of gear molded line is larger, causes volumetric efficiency to reduce in course of conveying, and energy consumption increases, and causes energy waste.

2,, in course of conveying, because of excesssive gap, and build-up of pressure is not steady, makes flow equal error larger.

3, traditional product, excessive because of relative gap, cause two gears to collide at mutual when working, thereby cause the noise of pump to strengthen.

Summary of the invention

The object of the invention is to adapt to production industry user's new demand, reach reduction energy consumption, enhance product performance, reduce the object of noise, the follow-on NCB crescent gear pump that provides a kind of design principle that adopts two circles that are in contact with one another to relatively rotate the short width pendulum Duo of formation to manufacture.

Object of the present invention can realize by following proposal:

A follow-on NCB crescent gear pump, comprises the pump housing, pump cover, sealing seat, external rotor and with the internal rotor of external rotor engagement, pump seat, through the fixing main shaft of bearing; Described external rotor, internal rotor are arranged in the cavity being comprised of the pump housing, pump cover and sealing seat, and described external rotor is fixed by described main shaft; Described sealing seat is located at the front end of described main shaft, and described sealing seat is fixed on described pump seat; The molded line of the gear of described external rotor is circular arc and opens shape, and the molded line of the gear of described internal rotor is curtate cyclod shape, and described internal rotor is linear with the gear of external rotor and contacts.

The axis of the axis of the gear of described internal rotor and the gear of described external rotor is parallel and do not coincide; Few 2 of the number of teeth of the gear of the external rotor described in the gear ratio of the gear of described internal rotor.

Described sealing seat is fixedly connected with pump seat by bolt; Described pump cover, sealing seat are fixedly connected with the pump housing by bolt respectively.

Described bearing is bolted on pump seat inside.

On the described pump housing, be provided with outlet radially, import with pump housing horizontal position.

The surface of contact of the gear of described external rotor is circular arc type.

Compared to the prior art, beneficial effect of the present invention:

1, the follow-on NCB crescent gear pump of the present invention has enough sciences, in course of conveying, because adopting curtate cyclod design principle, make interior external gear be all the time linear contact condition, make the pressure of pump steady, internal leakage obviously reduces, and noise obviously reduces;

2, the internal rotor of the follow-on NCB crescent gear pump of the present invention and the gear stable performance of external rotor, application of load work, durable in use for a long time.

Accompanying drawing explanation

Fig. 1 is the structural representation of follow-on NCB crescent gear pump;

Fig. 2 is the external rotor of follow-on NCB crescent gear pump and the mesh schematic representation of internal rotor;

In figure, the 1-pump housing; 2-pump cover; 3-sealing seat; 4-external rotor; 5-internal rotor; 6-pump seat; 7-bearing; 8-main shaft.

Embodiment

Below in conjunction with accompanying drawing, the present invention will be further described.

As shown in Figure 1, a kind of follow-on NCB crescent gear pump, adopt two circles that are in contact with one another to relatively rotate the design principles of the short width pendulum Duo of formation, it comprises the pump housing 1, pump cover 2, sealing seat 3, external rotor 4 and the internal rotor 5, the pump seat 6 that mesh with external rotor 4, is bolted on the bearing 7 of pump seat 6 inside, through the fixing main shaft 8 of bearing 7; Described pump cover 2, sealing seat 3 are fixedly connected with the pump housing 1 by bolt respectively, and described sealing seat 3 is located at the front end of described main shaft 8, and are bolted on described pump seat 6; Described external rotor 4, internal rotor 5 are arranged in the cavity being comprised of the pump housing 1, pump cover 2 and sealing seat 3; Described external rotor 4 is fixing by described main shaft 8; The molded line of the gear of described external rotor 4 is circular arc and opens shape, the molded line of the gear of described internal rotor 5 is curtate cyclod shape, few 2 of the number of teeth of the gear of the gear ratio external rotor 4 of the gear of internal rotor 5, the axis of the axis of the gear of described internal rotor 5 and the gear of described external rotor 4 is parallel and do not coincide, make cavity of the interior formation of the pump housing 1, the gear of internal rotor 5 and external rotor 4 is linear and contacts, both mesh eccentric rotary, and the cavity of the inside of the pump housing 1 has been divided into two vacuum storehouses of isolation completely.

On the described pump housing 1, be provided with outlet radially, import with the pump housing 1 horizontal position.

The surface of contact of the gear of described external rotor 5 is circular arc type.

The follow-on NCB crescent gear pump of the present invention has enough sciences, in course of conveying, because adopting curtate cyclod design principle, make interior external gear be all the time linear contact condition, make the pressure of pump steady, internal leakage obviously reduces, and noise obviously reduces; Application of load work, durable in use for a long time.

Claims

1. a follow-on NCB crescent gear pump, is characterized in that comprising the pump housing, pump cover, sealing seat, external rotor and with the internal rotor of external rotor engagement, pump seat, through the fixing main shaft of bearing; Described external rotor, internal rotor are arranged in the cavity being comprised of the pump housing, pump cover and sealing seat, and described external rotor is fixed by described main shaft; Described sealing seat is located at the front end of described main shaft, and described sealing seat is fixed on described pump seat; The molded line of the gear of described external rotor is circular arc and opens shape, and the molded line of the gear of described internal rotor is curtate cyclod shape, and described internal rotor is linear with the gear of external rotor and contacts.

2. follow-on NCB crescent gear pump according to claim 1, is characterized in that the axis of gear of described internal rotor and the axis of the gear of described external rotor are parallel and does not coincide.

3. follow-on NCB crescent gear pump according to claim 1, is characterized in that few 2 of the number of teeth of the gear of the external rotor described in the gear ratio of gear of described internal rotor.

4. follow-on NCB crescent gear pump according to claim 1, is characterized in that described sealing seat is fixedly connected with pump seat by bolt; Described pump cover, sealing seat are fixedly connected with the pump housing by bolt respectively.

5. follow-on NCB crescent gear pump according to claim 1, is characterized in that described bearing is bolted on pump seat inside.