CN101816986A

CN101816986A - Adjustable ejector nozzle and method for forming jet linear fluid

Info

Publication number: CN101816986A
Application number: CN 201010159734
Authority: CN
Inventors: 胡在定
Original assignee: HANGZHOU HUADA EJECT VACUUM EQUIPMENT CO Ltd
Current assignee: HANGZHOU HUADA EJECT VACUUM EQUIPMENT CO Ltd
Priority date: 2010-04-27
Filing date: 2010-04-27
Publication date: 2010-09-01
Anticipated expiration: 2030-04-27
Also published as: CN101816986B

Abstract

The invention relates to an adjustable ejector nozzle for linearly adjusting quality and flow of water vapor passing through a nozzle throat and a method for forming jet linear fluid. The adjustable ejector nozzle comprises a nozzle body, a communicating through cavity is formed in the body along the axial direction, a shrinkage cavity and an expansion cavity in the through cavity are positioned at two ends of the through cavity and are conical cavities, the middle cavity is a columnar throat, a core rod is arranged at a matched part of the shrinkage cavity and the throat, the head of the core rod is positioned in the shrinkage cavity, and the change of effective radial size of the nozzle throat is realized through the front and back movement of the core rod. The method has the following advantages that: 1, the cross section area of the throat can be intuitively, conveniently and flexibly controlled, the work of an ejector is stable, and the energy is saved; and 2, the operation is simple and convenient, and the efficiency is high.

Description

Adjustable injector nozzle and method for forming injection linear fluid

Technical Field

The invention relates to an adjustable ejector nozzle for linearly adjusting the mass flow of water vapor passing through a nozzle throat and a forming method for ejecting linear fluid, in particular to a nozzle used in a water vapor ejector, belonging to the field of nozzle manufacturing.

Background

The applicant has a publication number CN2475476Y, and discloses an ejector nozzle, which comprises a nozzle body, wherein a three-section through cavity of a contraction section, a throat neck and an expansion section is continuously arranged in the nozzle body, a core rod is arranged at a position matched with the contraction section, and the head of the core rod is a cone. Therefore, the effective radial size of the throat of the ejector nozzle can be changed by moving the core rod back and forth, the cross section area of the throat can be conveniently and flexibly controlled, the ejector can work stably, and energy is saved. The method has the following defects: because the mass flow of the water vapor still cannot be in a linear corresponding relation, the control and the measurement of the computer system are adopted, so that the sampling is very complicated, the software and hardware design is realized, the precision is low, the reliability is low, and the flow of the water vapor can hardly be controlled and measured by the computer system.

Disclosure of Invention

The design purpose is as follows: the defects in the prior art are avoided, and the adjustable ejector nozzle capable of linearly adjusting the mass flow of the water vapor passing through the throat of the nozzle and the forming method of the linear fluid are designed.

The design scheme is as follows: in order to achieve the above design objectives. 1. The design that the head of the core rod consists of a large cone, a parabolic cone and a small cone is the main technical characteristic of the invention. The purpose of this is to: the parabolic cone is positioned between the large cone and the small cone, the end part of the parabolic cone is the bottom part of the small cone, the bottom part of the parabolic cone is the end part of the large cone, the bottom part of the large cone is the end part of the mandrel, the position of the head part of the mandrel in the throat is manually or automatically adjusted, so that the effective radial size of the throat of the ejector nozzle can be changed through the back and forth movement of the mandrel, and the front and back inlet and outlet distances of the mandrel are influenced by the parabolic cone at the head part, so that the mass flow of the steam passing through the throat of the nozzle is in a linear corresponding relation. 2. The tail part of the core rod is matched and connected with the steam guide pipe sealing section, and the design of the core rod provided with the graduated scale is the second technical characteristic of the invention. The purpose of this is to: the flow meter not only can adjust the flow more conveniently and visually, but also can conveniently measure the flow of the fluid.

The technical scheme 1: the adjustable ejector nozzle comprises a nozzle body, wherein a through cavity is formed in the nozzle body in the axial direction, a contraction cavity and an expansion cavity are positioned at two ends of the through cavity and are conical cavities, a middle cavity is a cylindrical throat, a core rod is arranged at the matching position of the contraction cavity and the throat, the head of the core rod is positioned in the contraction cavity and changes of the effective radial size of the nozzle throat are realized through the front and back movement of the core rod, the head of the core rod is composed of a large cone part, a parabolic cone part and a small cone part, the parabolic cone part is positioned between the large cone part and the small cone part, the end part of the parabolic cone part is the small cone part, and the bottom part of the parabolic cone part is the large cone part end part and the bottom part of the large cone part is.

The technical scheme 2 is as follows: the adjustable ejector nozzle is used for manually or automatically adjusting the positions of the bottom of a large cone part, a parabolic cone part and a small cone part of a mandrel head part in a throat, and the parabolic cone part and the conical surface of the mandrel head part force the mass flow of water vapor passing through the throat of the nozzle to be in a linear corresponding relation.

Compared with the background technology, firstly, the invention can force the mass flow of the water vapor passing through the throat of the nozzle to be in a linear corresponding relation by manually or automatically adjusting the conical surface of the parabolic cone part of the head part of the mandrel; and secondly, the cross-sectional area of the throat can be controlled visually, conveniently and flexibly, so that the ejector works more stably and reliably, energy is saved, and the ejector is simple and convenient to operate and high in efficiency.

Drawings

Fig. 1 is a schematic structural view of an adjustable injector nozzle.

Fig. 2 is a schematic diagram of an embodiment of an adjustable injector nozzle.

Detailed Description

Example 1: reference is made to figures 1 and 2. An adjustable ejector nozzle comprises a nozzle body 2, wherein a through cavity is formed in the body along the axial direction, a contraction cavity 3 and an expansion cavity 5 in the through cavity are positioned at two ends of the through cavity and are conical cavities, a middle cavity is a cylindrical throat 4, a core rod 1 is arranged at the matching position of the contraction cavity 3 and the throat 4, the head of the core rod 1 is positioned in the contraction cavity 3 and changes the effective radial size of the nozzle throat 4 through the back and forth movement of the core rod 1, the head of the core rod 1 is composed of a large cone part 6, a parabolic cone part 7 and a small cone part 8, the parabolic cone part 7 is positioned between the large cone part 6 and the small cone part 8, the end part of the parabolic cone part 7 is the small cone part 8, the bottom of the parabolic cone part 7 is the end part of the large cone part 6, and the bottom part of the large cone part 6 is. When the working steam generates fluctuation change, the mandrel 1 can move back and forth, and the positions of the head cone 6, the parabolic cone 7 and the small cone 8 of the mandrel 1 in the throat 4 are changed, so that the cross-sectional area of the throat 4 is changed, and the steam mass flow rate passing through the nozzle is constant. Similarly, the discharge pressure of the ejector can be changed by changing the cross-sectional area of the throat 4 by changing the front and rear positions of the mandrel bar 1 to appropriate scale positions after the temperature of the cooling water in the condenser is changed in winter and summer.

The nozzle calculation formula is as follows:

wherein,

the core rod 1 is provided with a scale 9.

The tail part of the core rod 1 is connected with the steam guide pipe sealing section in a matching mode.

Example 2: on the basis of the embodiment 1, the forming method for the adjustable ejector nozzle to spray the linear fluid comprises the adjustable ejector nozzle, the positions of the bottom of a large conical part 6, a parabolic conical part 7 and a small conical part 8 of the head of the core rod 1 in the throat 4 are manually or automatically adjusted, and the conical surface of the parabolic conical part 7 of the head of the core rod 1 forces the mass flow of the water vapor passing through the throat of the nozzle to be in a linear corresponding relation.

It is to be understood that: although the above embodiments have described the design idea of the present invention in more detail, these descriptions are only simple descriptions of the design idea of the present invention, and are not limitations of the design idea of the present invention, and any combination, addition, or modification without departing from the design idea of the present invention falls within the scope of the present invention.

Claims

1. The utility model provides an ejector nozzle with adjustable, includes the nozzle body, this internal edge axial of following opens has the logical chamber that link up, and the shrink chamber is located the both ends that lead to the chamber and is circular cone cavity, middle chamber for cylinder type larynx with expansion chamber in should leading to the chamber, is equipped with a plug with shrink chamber and larynx cooperation department, and the head of plug is located the shrink intracavity and realizes the change of the effective radial dimension of nozzle larynx through the back-and-forth movement of plug, characterized by: the head of the mandrel is composed of a large cone, a parabolic cone and a small cone, the parabolic cone is positioned between the large cone and the small cone, the end part of the parabolic cone is a small cone bottom, and the bottom part of the parabolic cone is a large cone end and a large cone bottom is a mandrel end.

2. The adjustable injector nozzle as claimed in claim 1, wherein: the nozzle calculation formula is as follows:

d = D 1 * \sqrt{1.1 / {(1.1)}^{2}},

wherein,

D = \sqrt{({D 1}^{2} - d^{2}},

3. the adjustable injector nozzle as claimed in claim 1, wherein: the core rod is provided with a scale.

4. The adjustable injector nozzle as claimed in claim 1, wherein: the tail part of the core rod is connected with the steam guide pipe sealing section in a matched mode.

5. A method for forming linear fluid sprayed by an adjustable sprayer nozzle comprises the adjustable sprayer nozzle and is characterized in that: the positions of the bottom of the big cone part, the parabolic cone part and the small cone part of the mandrel head part in the throat are manually or automatically adjusted, and the parabolic cone part and the conical surface of the mandrel head part force the mass flow of the water vapor passing through the nozzle throat to be in a linear corresponding relation.