JPS5940000A - Steam ejector - Google Patents

Abstract

PURPOSE:To have effective conversion of a mixture gas having high velocity energy into pressure energy by inserting two or more perforated plates with baffle effect, or wire meshes, in a spreading pipe at diffuser outlet of a steam ejector. CONSTITUTION:Two or more perforated plates 4 with baffle effect, or wire meshes 5, are inserted in a spreading pipe 2 of a diffuser of steam ejector to increase the fluid resistance inside the spreader 2, so that the speed of the exhaust gas flow passing through the pipe can be uniformed. Accordingly the condition of blowing off through the central part is eliminated, and speed difference of the exhaust gas passing through the spreading part 2 of the diffuser can be lessened. Further a large effect for converting the velocity energy into pressure energy can be obtained to ensure sufficient restoration of the pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention achieves high flow rate from the differential user throat section by inserting several perforated plates or straightening wire mesh into the divergent section of the differential user tube of the steam ejector. This steam ejector has an energy-saving effect and is characterized in that sufficient pressure recovery is achieved by effectively converting the mixed gas into pressure energy with a high efficiency.

Conventional steam ejectors inject working steam into the suction chamber through an expansion nozzle, and this high-speed steam flow passes through the differential user after the steam and gas to be extracted are suctioned. The velocity energy is converted into pressure energy and released from the outlet.

Restoration of pressure inside the differential user is mainly carried out in the tube that widens at the end of the differential user, but because it is a single tube that widens at the end, sufficient pressure recovery cannot be measured, and the pressure is recovered in the differential user with high velocity energy. The i and II air jets blow through the center of the divergent tube, resulting in a loss of energy.

The ejector according to the present invention eliminates the condition of blowing through the center by increasing the flow resistance in the tube that widens at the end and by averaging the speed of the exhaust gas flow passing through the tube. We were able to achieve great effects in reducing the speed difference of the exhaust gas passing through the widening section at the end of the differential user, and converting speed energy into pressure cylinder key.

The specification range of perforated rectifier plate and rectifier wire mesh confirmed through experiments is as follows: Perforated rectifier plate Effective diameter DD Perforated rectifier plate Hole diameter dD Rectifier wire mesh Effective diameter Dw Rectifier wire mesh Opening #Mesh steam ejector - differential user throat inner diameter D The results of experiments using a steam ejector equipped with the device showed that the larger the size of the ejector and the higher the degree of vacuum, the greater the effect of reducing the amount of steam.

As per the experimental results method The steam ejector used in the experiment was as follows.

Throat diameter 50% Suction vacuum 5% H1 radiation vacuum
75%Hf Extraction amount 5-10 kg/H Vapor pressure before nostle 8-5 H/ca

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the steam ejector behind the differential user throat, and three rectifying perforated plates are used in the wide end tube of the differential user. Figure 2 is a plane view of the perforated rectifying plates and the rectifying wire mesh. The figure shows the nomenclature for the tolerance used. 1 Steam ejector - differential user throat 2 Steam ejector - differential user divergent pipe 3 Steam ejector - exhaust steam waste output 14 Rectifying perforated plate 5 Rectifying wire mesh 6 Differential user throat inner diameter 7 Rectifying perforated plate or rectifying wire mesh effective diameter Patent applicant
Shigeru Hikaru

Claims (1)

[Claims] Steam ejector 0, in which several perforated plates with a rectifying effect or rectifying wire mesh are inserted inside the divergent tube at the differential user outlet of the steam ejector.