CN85204895U

CN85204895U - Jet pump with spinning velocity-sharing nozzle

Info

Publication number: CN85204895U
Application number: CN 85204895
Authority: CN
Inventors: 邹阳生
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-11-06
Filing date: 1985-11-06
Publication date: 1986-10-22

Abstract

The utility model relates to a jet pump which is composed of a nozzle system and a jet cylinder. The utility model is characterized in that the nozzle system adopts a spinning uniform nozzle. An exhaust opening of the nozzle is made into a slit shape, and the head of the slit skews for an angle towards the vertical direction of the slit. When the mainstream is jet from the spraying slit, the tangential component force produced by the jet stream from the head of the spraying slit can drive the nozzle to rotate, so that the jet mainstream is rotary. The rotary mainstream can enhance the pumping action to the secondary stream, and enables the mainstream and the secondary stream to homogeneously mix in a short flow path rapidly, so that the ability of the jet pump in pumping and jetting fluid is improved, and the axial dimension of the jet pump is shortened.

Description

Jet pump with spinning velocity-sharing nozzle

The design relates to a kind of jet pump, and particularly its nozzle system adopts the jet pump of " the even nozzle of spin speed " discharge rotation jet flow.

Mostly engineering circle jet pump commonly used is to adopt simple awl cylindrical nozzle at present, and when its ejection had the major flow of certain pressure to cross the mixing chamber of jet pump, just the inferior stream of going into the jet pump suction mixed, and gives time stream with energy transfer.Because the jet of awl cylindrical nozzle ejection is not high to the pumping efficiency of inferior stream, and with mixing of inferior stream only be originate in the main flow border mixed by oozing naturally of causing of pulsation and viscosity, so the mixing of primary-to-secondary flow is also insufficient; Jet pump is in order to provide enough blending spaces to primary-to-secondary flow, its axial dimension is also longer.The extensive utilization that this has not only influenced jet pump also makes the capacity usage ratio of jet pump not ideal enough.

In order to address this problem, external aeronautical chart for jet pump is used for vertically/high lift device of stol aircraft studies.Test shows: increase the aspiration to inferior stream air, and primary-to-secondary flow is promptly evenly mixed in short to the greatest extent flow process, can improve the efficient of jet pump.In research report " pushing jet pump " (AD A017782:THRUST AUGMENTING EJECTORS), strengthen the suction of inferior stream and the nozzle that mixes by the turbulence scale that increases main jet stream with regard to having listed several.But these nozzles are for the thrust that improves jet pump designs, and it is applied to the exhausting exhaust, or gas-gas mixes, when liquid-gas mixes and uneconomical, have in addition be difficult to practicality.

The design's task provides the jet pump that a kind of nozzle system adopts " the even nozzle of spin speed ".The main jet that " the even nozzle of the speed that spins " energy discharge rotates flows, and strengthens the pumping action of jet pump to inferior stream, and the active in rotation of main jet stream sweeps across inferior stream, and primary-to-secondary flow is promptly evenly mixed in short flow process, thereby the raising jet pump aspirates and the ability of dispatch fluid.

The design's task realizes as follows: columnar nozzle is assemblied in the outside of circular housing by transition part and bearing; The relief opening of nozzle is made slit-shaped, and the external end head in slit is to direction deflection one angle perpendicular to spray seam, and along the circumferential direction consistent.From the honeycomb duct flow nozzle, when the mixing chamber discharge main flow of jet pump, can produce tangential component as the fluid of certain pressure from the fluid of spray seam termination ejection by the spray seam.The couple that these component form can drive the nozzle that links to each other with bearing and rotate automatically, and the main flow of ejection is rotated.

The design's further improvement is on the cylindrical of the transition part that nozzle and outer race link fan blade to be installed, and when it rotates with nozzle, can strengthen the conveying to inferior stream.

Describe the concrete structure of this jet pump and nozzle thereof in detail below with reference to accompanying drawing.

Fig. 1 is to use the longitudinal sectional drawing of the jet pump of " the even nozzle of spin speed ", and Fig. 2 is the side view of Fig. 1, and Fig. 3 is the plan view of Fig. 1, and Fig. 4 is the enlarged view of analysing and observe along the A-A line among Fig. 2.

With reference to Fig. 1, a bearing " 2 " is arranged on the cylindrical of honeycomb duct " 1 ", collar " 3 " is the transition part that connects nozzle " 4 " and bearing " 2 " outer shroud, the assembly relation of above-mentioned four parts all is an interference fit; Can make fan blade as required on the cylindrical of collar " 3 "; Nozzle " 4 " is coaxial with honeycomb duct " 1 ", and ingress several millimeters length approximately is enclosed within the outside of honeycomb duct " 1 ", the middle radial clearance that keeps 0.1～0.5 millimeter; Packing ring " 5 " is used for main flow is sealed; The mixing chamber and the explosion chamber that have comprised jet pump in the injection cylindrical shell " 6 ", M among the figure and D are the length of mixing chamber and explosion chamber.

The relief opening of nozzle " 4 " can be made into spray seam form as shown in Figure 2.

M among the figure, D and angle of declination Z determine according to the speed and the flow of main flow.

According to process conditions and material, nozzle " 4 " can close with collar " 3 " and make a part.

This nozzle system adopts the jet pump of " the even nozzle of spin speed ", is applicable to the exhausting exhaust, or gas-gas mixes, liquid-engineering fields such as gas mixing, not only can improve the utilization ratio to the main jet stream energy, and can shorten its axial dimension.Under inferior stream and situation that barometric pressure communicates, can make full use of barometric pressure and give time momentum of stream, not only make the mass flow of the fluid by jet pump increase to more than 5 times of main jet stream, and the momentum of fluid also can increase to more than 1.3 times.It is estimated, when the outlet pressure of main flow when 250 column are high, the total length that reaches the jet pump of above-mentioned performance is no more than 30 centimetres.

The design's jet pump can be used for " persuader " in the induction air conditioning system, can improve the induction ratio of " persuader ".Also can be made into the equipment of similar " simple and easy persuader ",, increase draft by draws ambient air concentrating in the ventilation system of dispatch gas with pipeline.

Claims

1, a kind of jet pump of forming by nozzle system and injection cylindrical shell, the relief opening that it is characterized in that the nozzle " 4 " of nozzle system is made into slit-shaped, the external end head in slit is to the angle of direction deflection perpendicular to the slit, and along the circumferential direction consistent, the cylindrical shape inlet of nozzle " 4 " is partly by collar " 3 " and the outer race interlock that is assemblied on the honeycomb duct.

2, jet pump according to claim 1 is characterized in that being shaped on fan blade on the cylindrical of collar " 3 ".