CN205278654U

CN205278654U - Reverse nozzle pressure reduction means

Info

Publication number: CN205278654U
Application number: CN201520999801.3U
Authority: CN
Inventors: 李欣龙
Original assignee: China Tianchen Engineering Corp; Tianjin Tianchen Green Energy Resources Engineering Technology and Development Co Ltd
Current assignee: China Tianchen Engineering Corp; Tianjin Tianchen Green Energy Resources Engineering Technology and Development Co Ltd
Priority date: 2015-12-04
Filing date: 2015-12-04
Publication date: 2016-06-01
Anticipated expiration: 2025-12-04

Abstract

The utility model provides a reverse nozzle pressure reduction means, its reverse nozzle and radome fairing in arranging the pipeline in, two parts are separated into with the pipeline to reverse nozzle, partly influent stream way that is, and another part is for going out the runner, the one end of the reverse nozzle influent stream end for lieing in the influent stream and saying, the effluent end of the other end for lieing in a runner, the both sides of influent stream end are inwards sunken to form arc runner, and opens between two arc runner and have the internal flow passageway, says and the play runner through internal flow passageway intercommunication influent stream, still be equipped with the radome fairing in the influent stream is said, the radome fairing includes a palirrhea cavity, and palirrhea cavity is arranged in the place ahead of internal flow passageway, this palirrhea cavity forms the choked flow passageway with the arc runner intercommunication. The position relation of radome fairing and reverse nozzle has formed one and has obstructed the fluid cavity that the fluid passes through, so through consuming a large amount of energy of fluidic, and the effect that reduces fluid pressure of having played.

Description

A kind of contrainjector step-down device

Technical field

The utility model belongs to fluid step-down field, especially relates to a kind of contrainjector step-down device.

Background technology

At present, conventional fluid depressurization device adopts orifice plate, multilevel decompression orifice plate, Venturi tube etc.

Wherein, orifice plate opens a hole on one block of plate, and after fluid flows through this hole, pressure can reduce. And multilevel decompression orifice plate is the series connection of multiple orifice plate, it is to increase step-down ability. Venturi tube is the thick pipeline in thin two, a kind of centre, and fluid flows through this kind of pipeline pressure also can be reduced, and is used for the fluid containing solid particulate matter.

The principle of orifice plate is exactly diminished in aperture in the suitable place of pipeline, and when liquid is through reducing, fluid space can attenuate or shrink. And the minimum transverse section of this fluid space appears at the downstream of actual reducing, it is called vena contracta. At vena contracta place, flow velocity is maximum, increasing with the reduction greatly of vena contracta place pressure of flow velocity. When fluid space expansion enters bigger region, fluid velocity declines, and pressure increases, but due to bigger internal turbulence and energy expenditure, downstream pressure can not return to the pressure of upstream completely, thus plays the effect reducing hydrodynamicpressure.

Current orifice plate, reducing under the higher requirement of pressure, can only reduce aperture. And the solid impurity that aperture reduces in rear fluid not easily passs through orifice plate, it is easy to blocking orifice plate. And the too little meeting in aperture makes noise excessive, affect the health of people around. Meanwhile, the too little cavitation phenomenons that also may cause liquid in aperture, shortens the work-ing life of orifice plate and pipeline. Multilevel decompression orifice plate can solve the problems referred to above of individual layer orifice plate, but its cost is higher, and volume is bigger. Venturi tube step-down device wear resisting property is good, is suitable for the fluid containing solid particulate matter, but its step-down ability is lower than the orifice plate in same aperture, and cost is higher, and volume is bigger.

Summary of the invention

In view of this, the utility model is intended to propose a kind of contrainjector step-down device, to solve, while fluid step-down, reducing the problem of channel blockage.

For achieving the above object, the technical solution of the utility model is achieved in that

A kind of contrainjector step-down device, it comprises the contrainjector and nose cone being placed in pipeline;

Pipeline is separated into two portions by described contrainjector, and a part is for entering runner, and another part is for going out runner;

One end of described contrainjector is be positioned to enter to flow end into runner, the other end be positioned at runner go out to flow end, described enter flow end both sides be inwardly recessed to form arc runner, and between two described arc runners, have internal flow channel, it is connected into runner by described internal flow channel and goes out runner;

Entering also to be provided with nose cone in runner described, described nose cone comprises a reflux cavity, and described reflux cavity is placed in the front of described internal flow channel, and this reflux cavity is connected with described arc runner and forms channel of resistance to flow.

Further, described nose cone is arc cover body, and this nose cone comprises the reflux cavity of arc.

Further, described internal flow channel is cylindrical channel.

Further, by entering, runner increases gradually the internal diameter of described internal flow channel to the direction going out runner.

Further, described nose cone is fixedly connected with contrainjector.

Further, described nose cone is fixedly connected with inner-walls of duct.

Relative to prior art, a kind of contrainjector step-down device described in the utility model has following advantage:

The position relation of nose cone described in the utility model and contrainjector defines a fluid chamber obstructing fluid and passing through, so by the big energy consuming fluid, and serve the effect reducing hydrodynamicpressure;

Meanwhile, also because of the constructional feature in fluid chamber for this reason, the problem that the refuse that therefore can not produce to cause because of simple reduction fluid channel blocks, and then reduce the turnover rate of whole step-down device.

Accompanying drawing explanation

The accompanying drawing forming a part of the present utility model is used to provide of the present utility model it is further understood that schematic description and description of the present utility model is for explaining the utility model, does not form improper restriction of the present utility model. In the accompanying drawings:

Fig. 1 is a kind of contrainjector step-down device one-piece construction schematic diagram described in the utility model embodiment;

Fig. 2 is that the liquid flow of a kind of contrainjector step-down device described in the utility model embodiment is to schematic diagram.

Description of reference numerals:

1-pipeline; 2-contrainjector; 3-nose cone; 4-internal flow channel; 5-enters circulation road; 6-reflux passage; 7-enters runner; 8-goes out runner.

Embodiment

It should be noted that, when not conflicting, the embodiment in the utility model and the feature in embodiment can combine mutually.

Below with reference to the accompanying drawings and come the utility model is described in detail in conjunction with the embodiments.

As shown in Figure 1, a kind of contrainjector step-down device, it comprises the contrainjector 2 and nose cone 3 that are placed in pipeline 1;

Pipeline 1 is separated into two portions by described contrainjector 2, and a part is for entering runner 7, and another part is for going out runner 8;

One end of described contrainjector 2 is be positioned to enter to flow end 5 into runner 7, the other end be positioned at runner 8 go out to flow end, described enter flow end 5 both sides be inwardly recessed to form arc runner, this is entered to flow end 5 and is seamlessly transitted by this arc runner with described pipeline 1 inwall, and between two described arc runners, have internal flow channel 4, it is connected into runner 7 by described internal flow channel 4 and goes out runner 8;

On the other hand, enter to flow end 5 can be centre be provided with projection and both sides depression, namely the depression on described both sides forms above-mentioned arc runner, and has described internal flow channel 4 on lug boss.

Described internal flow channel 4 is cylindrical channel; By entering, runner 7 increases gradually the internal diameter of described internal flow channel 4 to the direction going out runner 8, or tubaeform passage.

Enter also to be provided with nose cone 3 in runner 7 described, described nose cone 3 is arc cover body, the outside surface of this nose cone 3 is arc, described nose cone 3 comprises the reflux cavity 6 of an arc, described reflux cavity 6 is placed in the front of described internal flow channel 4, and this reflux cavity 6 is connected formation channel of resistance to flow with described arc runner.

Described nose cone 3 is fixedly connected with contrainjector 2 or is fixedly connected with pipeline 1 inwall, and the mode that is fixedly connected with connects by steel bar or steel disc.

As shown in Figure 2, contrainjector 2 is placed in pipeline 1, has flow of fluid from left to right in pipeline 1, and its streak line 4 band arrow dotted line represents. When fluid flows to contrainjector place through entering runner, direction changes in the channel of resistance to flow entering between nose cone and nozzle, continues to change direction immediately and flows to out runner. Suddenly changing twice direction and consume big energy, play the effect of step-down, the change of flow direction simultaneously creates a large amount of whirlpools, consumes big energy equally, reduces hydrodynamicpressure.

The foregoing is only better embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims

1. a contrainjector step-down device, it is characterised in that: comprise the contrainjector (2) and nose cone (3) that are placed in pipeline (1);

Pipeline (1) is separated into two portions by described contrainjector (2), and a part is for entering runner (7), and another part is for going out runner (8);

One end of described contrainjector (2) enters to flow end (5) for being positioned at into runner (7), the other end for be positioned at runner (8) go out to flow end, described enter flow end (5) both sides be inwardly recessed to form arc runner, and between two described arc runners, have internal flow channel (4), it is connected into runner (7) by described internal flow channel (4) and goes out runner (8);

Enter also to be provided with nose cone (3) in runner (7) described, described nose cone (3) comprises a reflux cavity (6), described reflux cavity (6) is placed in the front of described internal flow channel (4), and this reflux cavity (6) is connected formation channel of resistance to flow with described arc runner.

2. a kind of contrainjector step-down device according to claim 1, it is characterised in that: described nose cone (3) is arc cover body, and this nose cone (3) comprises the reflux cavity (6) of arc.

3. a kind of contrainjector step-down device according to claim 1, it is characterised in that: described internal flow channel (4) is cylindrical channel.

4. a kind of contrainjector step-down device according to claim 1, it is characterised in that: by entering, runner (7) increases gradually the internal diameter of described internal flow channel (4) to the direction going out runner (8).

5. a kind of contrainjector step-down device according to claim 1, it is characterised in that: described nose cone (3) is fixedly connected with contrainjector (2).

6. a kind of contrainjector step-down device according to claim 1, it is characterised in that: described nose cone (3) is fixedly connected with pipeline (1) inwall.