阅读说明：本技术 一种弹性材料中间段形状可变的喷射器 (Ejector with variable shape of middle section of elastic material ) 是由 祝银海 姜培学 于 2021-01-08 设计创作，主要内容包括：本发明属于能源与动力技术领域,尤其涉及一种弹性材料中间段形状可变的喷射器。包括喷嘴、二次流吸入室、弹性材料中间段、出口段和一个形状控制系统。形状控制系统由导轨、丝杆、滑块和步进电机组成。二次流吸入室、弹性材料中间段和出口段通过第一法兰、第二法兰、第三法兰和第四法兰同轴安装,喷嘴轴向插入二次流吸入室中；所述的形状控制系统的滑块通过连接段与出口段相对固定,滑块通过滑块内部的螺纹与所述的丝杆联动,丝杆带动滑块沿导轨平移,丝杆与所述的步进电机的输出轴联动。本发明的弹性材料中间段形状可变的喷射器,具有结构简单、体积较小、安装方便等优点,可以针对不同的变工况运行条件,方便地调节二次流的流量。(The invention belongs to the technical field of energy and power, and particularly relates to an ejector with a variable middle section shape made of an elastic material. Comprising a nozzle, a secondary flow suction chamber, an intermediate section of elastomeric material, an outlet section, and a shape control system. The shape control system consists of a guide rail, a screw rod, a slide block and a stepping motor. The secondary flow suction chamber, the elastic material middle section and the outlet section are coaxially arranged through a first flange, a second flange, a third flange and a fourth flange, and the nozzle is axially inserted into the secondary flow suction chamber; the slide block of the shape control system is relatively fixed with the outlet section through the connecting section, the slide block is linked with the lead screw through threads inside the slide block, the lead screw drives the slide block to translate along the guide rail, and the lead screw is linked with the output shaft of the stepping motor. The ejector with the variable shape of the middle section of the elastic material has the advantages of simple structure, small volume, convenience in installation and the like, and the flow of secondary flow can be conveniently adjusted according to different variable working condition running conditions.)

1. The ejector with the variable shape of the middle section of the elastic material comprises a nozzle, a secondary flow suction chamber, the middle section of the elastic material and an outlet section, and is characterized by further comprising a shape control system, wherein the shape control system consists of a guide rail, a screw rod, a sliding block and a stepping motor; the secondary flow suction chamber, the elastic material middle section and the outlet section are coaxially arranged through a first flange, a second flange, a third flange and a fourth flange, and the nozzle is axially inserted into the secondary flow suction chamber; the slide block of the shape control system is relatively fixed with the outlet section through the connecting section, the slide block is linked with the lead screw through threads inside the slide block, the lead screw drives the slide block to translate along the guide rail, and the lead screw is linked with the output shaft of the stepping motor.

2. A variable geometry eductor according to claim 1, wherein the elastomeric mid-section 5 comprises a converging portion, an equal area portion and a diverging portion, the diverging portion having a wall thickness greater than the wall thickness of the converging portion and the equal area portion.

3. A variable geometry eductor according to claim 1, wherein the elastomeric mid-section 5 comprises a constriction, or comprises a constriction and an equal area portion.

4. A variable geometry emitter according to claim 1 wherein said elastomeric mid-section is formed of a material selected from the group consisting of a plastic polyurethane elastomer.

Technical Field

The invention belongs to the technical field of energy and power, and particularly relates to an ejector with a variable middle section shape made of an elastic material.

Background

The ejector has simple structure, low cost, easy operation and convenient maintenance, and is widely applied to a plurality of fields such as refrigeration, fuel cells, chemical industry, aerospace and the like. The ejector is also called a jet vacuum pump, a jet vacuum ejector, a jet pump, a water ejector, a vacuum ejector, etc. depending on its use. As a pressurized, vacuum, mixing device, ejectors often play a critical part in the system. The performance of the ejector is improved, and the overall system efficiency of the related industrial field can be improved.

The structural dimensions of the injector affect the performance of the injector. In a particular application, the system often requires changing operating parameters, and thus, the requirement for variable-condition operation of the injector is high. The existing methods mainly comprise several types, one is to change the throat area of a nozzle to adjust the flow of working flow of an ejector, the other is to change the distance of the nozzle to adjust the flow of secondary flow, and the other is to adopt a plurality of ejectors to be connected in parallel to adjust the flow of the working flow and the secondary flow.

The above-mentioned methods are either structurally complex or adjustable to a small extent. Therefore, there is a need to further optimize the tuning method of the injector configuration.

Disclosure of Invention

The invention aims to provide an ejector with a variable-shape middle section made of elastic materials.

The ejector with the variable shape of the middle section of the elastic material comprises a nozzle, a secondary flow suction chamber, the middle section of the elastic material, an outlet section and a shape control system, wherein the shape control system consists of a guide rail, a screw rod, a sliding block and a stepping motor; the secondary flow suction chamber, the elastic material middle section and the outlet section are coaxially arranged through a first flange, a second flange, a third flange and a fourth flange, and the nozzle is axially inserted into the secondary flow suction chamber; the slide block of the shape control system is relatively fixed with the outlet section through the connecting section, the slide block is linked with the lead screw through threads inside the slide block, the lead screw drives the slide block to translate along the guide rail, and the lead screw is linked with the output shaft of the stepping motor.

The ejector with the variable middle section of the elastic material has the advantages that:

the ejector with the variable shape of the middle section of the elastic material has the advantages of simple structure, small volume, convenience in installation and the like, and the flow of secondary flow can be conveniently adjusted through the stepping motor according to different variable working condition running conditions. The method only changes the appearance of the injector and does not change the internal flow of the injector, and compared with the conventional method for inserting the valve core needle, the method avoids the loss of flow resistance caused by the valve core needle. The continuous edge shape of the ejector structure can be realized through the movement of the stepping motor, so that the continuous adjustment of the flow of the secondary flow is realized, and the problem that the flow of the secondary flow can only be discontinuously adjusted when a method of connecting a plurality of ejectors in parallel is adopted in the prior art is solved.

Drawings

Fig. 1 is a schematic structural view of an ejector with a variable shape of an intermediate section of elastomeric material according to the present invention.

In fig. 1, 1 is a nozzle, 2 is a secondary flow suction chamber, 3 is a first flange, 4 is a second flange, 5 is an intermediate section of an elastic material, 6 is a third flange, 7 is a fourth flange, 8 is an outlet section, 9 is a guide rail, 10 is a lead screw, 11 is a slider, 12 is a connecting section, and 13 is a stepping motor.

Detailed Description

The ejector with the variable shape of the middle section of the elastic material is structurally shown in figure 1 and comprises a nozzle 1, a secondary flow suction chamber 2, the middle section 5 of the elastic material, an outlet section 8 and a shape control system, wherein the shape control system consists of a guide rail 9, a screw rod 10, a sliding block 11 and a stepping motor 13; the secondary flow suction chamber 2, the elastic material middle section 5 and the outlet section 8 are coaxially installed through a first flange 3, a second flange 4, a third flange 6 and a fourth flange 7, the nozzle 1 is axially inserted into the secondary flow suction chamber 2, a sliding block 11 of the shape control system is relatively fixed with the outlet section 8 through a connecting section 12, the sliding block 11 is linked with a lead screw 10 through threads inside the sliding block 11, the lead screw 10 drives the sliding block 11 to translate along a guide rail 9, and the lead screw 10 is linked with an output shaft of a stepping motor 13.

The working principle and the working process of the ejector with the shape variable middle section of the elastic material are described in detail in the following with the accompanying drawings:

the invention relates to an ejector with a variable elastic material middle section shape, which comprises an ejector containing an elastic material middle section and a shape control system, wherein a nozzle 1, a secondary flow suction chamber 2, an elastic material middle section 5, an outlet section 8 and the like form the ejector, and a guide rail 9, a screw rod 10, a slide block 11, a stepping motor 13 and the like form the shape control system. The injector and the control system are connected by a connecting section 12. The secondary flow suction chamber 2 is sealed and connected with one side of the elastic material middle section 5 by a flange, and the outlet section 8 is sealed and connected with the other side of the elastic material middle section 5 by a flange. The shape control system drives the sliding block 10 through the stepping motor 13, and then drives the outlet section 8 of the ejector to move left and right, and further causes the middle section 5 of the elastic material to stretch and contract and deform.

The ejector with the shape-variable elastic material middle section comprises an elastic material middle section 5, a contraction part, an equal-area part and an expansion part, wherein the wall thickness of the expansion part is larger than that of the contraction part and the equal-area part. The intermediate section 5 of elastic material comprises a contracted portion or comprises a contracted portion and an equal area portion. The middle section 5 of the elastic material is made of a plastic polyurethane elastomer, also called thermoplastic polyurethane rubber, and is abbreviated as TPU.

As shown in fig. 1, the operation of the injector with a variable shape of the intermediate section of elastic material is as follows:

the working fluid of the ejector flows in from one end of the nozzle 1, forms supersonic flow at the outlet of the nozzle 1, sucks the secondary flow into the secondary flow suction chamber 2, mixes with the secondary flow in the middle section 5 of the elastic material and flows out of the ejector from the outlet section 8. The intermediate section 5 of elastic material comprises a contracted portion, an equal area portion and an expanded portion, and may comprise only a contracted portion or a contracted portion and an equal area portion. Wherein the wall thickness of the expansion portion of the middle section of the elastic material is greater than the wall thickness of the contraction portion and the equal-area portion.

When the ejector starts to work, the ejector works at a design point under the rated working condition of the system, the shape control system does not work at the moment, and the sliding block 11 is in the initial position. When the system works in a state of deviating from a rated working condition and the ejector is required to increase the flow rate of the secondary flow, the shape control system works, the sliding block 11 translates rightwards, and the middle section 5 of the elastic material is stretched; when the system works in a state of deviating from a rated working condition and the ejector is required to reduce the flow of the secondary flow, the shape control system works, the sliding block translates leftwards to compress the middle section 5 of the elastic material.

In the working process of the ejector, the shape control system drives the sliding block 11 through the stepping motor 13, so that the outlet section 8 of the ejector is driven to move left and right, and the stretching and contraction deformation of the middle section 5 of the elastic material is further caused. The working fluid of the ejector flows in from one end of the nozzle 1, forms supersonic flow at the outlet of the nozzle 1, sucks the secondary flow into the secondary flow suction chamber 2, mixes with the secondary flow in the middle section of the elastic material and flows out of the ejector from the outlet section 8.