CN218101340U

CN218101340U - Composite ejector

Info

Publication number: CN218101340U
Application number: CN202221616007.2U
Authority: CN
Inventors: 张建明; 姬广存; 孙耀玮; 冯琦
Original assignee: Yingjia Power Technology Wuxi Co ltd
Current assignee: Yingjia Power Technology Wuxi Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-12-20
Anticipated expiration: 2032-06-27

Abstract

The utility model discloses a compound ejector belongs to fuel cell technical field. The composite ejector comprises a nozzle body, a backflow shell and a bypass shell. High-pressure hydrogen enters the inner pore channel of the nozzle body from the jet inlet of the nozzle body and then flows out from the jet hole. The low pressure gas mixture of backward flow gets into first drawing from the backward flow entry of backward flow casing and penetrates the chamber to the fluid that flows from the jet orifice is accelerated in first mixing chamber, flows from first export after the diffusion in diffusion chamber. The bypass high-pressure hydrogen enters the second injection cavity from a bypass inlet of the bypass shell, and enters the second mixing cavity to accelerate the fluid flowing out of the first outlet through the acceleration of the annular flow channel, and finally flows out of the composite injector from the second outlet. The composite ejector accelerates the returned low-pressure mixed gas twice, fully utilizes the energy of the bypass fluid, simplifies the pipeline and improves the overall efficiency of the ejector.

Description

Composite ejector

Technical Field

The utility model belongs to the technical field of fuel cell, particularly, relate to a compound ejector.

Background

In the fuel cell system, the metering ratio requirement of hydrogen is different due to different working conditions of the electric pile. In order to ensure high efficiency, the hydrogen supply amount is required to be larger than the hydrogen consumption amount. The stack is necessary to have excessive hydrogen during operation. The ejector can suck hydrogen in the galvanic pile out for backflow, and supply the hydrogen to the galvanic pile again after being converged with the supplied hydrogen again, so that the sufficient flow is ensured.

An eductor is a device that draws fluid from a target vessel or system. The effect is similar to a compressor or vacuum pump. The biggest difference between the two is that the ejector does not have any movable parts. The eductor is a relatively low cost, easy to operate and easy to maintain device.

At present, an ejector with a common structure in a fuel cell system adopts high-pressure hydrogen at a jet flow inlet to drive low-pressure mixed gas at a return flow inlet. The hydrogen at the bypass inlet directly enters the electric thruster, a separate pipeline is needed, and the energy of the bypassed high-pressure hydrogen is not fully utilized.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a low pressure gas mixture that can utilize the hydrogen of bypass inlet to flow back with higher speed once more to simplify the compound ejector of pipeline.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a composite ejector, comprising:

the nozzle body is provided with an inner pore channel along the shaft, and both ends of the inner pore channel are provided with a jet inlet and a jet hole;

the backflow shell is provided with a backflow inlet in the radial direction, an inner pore passage is arranged along the axial direction, the tail end of the inner pore passage is a first outlet, and the backflow shell is sleeved outside the nozzle body to form a first injection cavity;

the bypass shell is radially provided with a bypass inlet, an inner pore passage is axially arranged, the tail end of the inner pore passage is a second outlet, and the bypass shell is sleeved outside the backflow shell to form a second injection cavity;

a jet hole of the nozzle body extends into the first injection cavity to form a first mixing cavity; the first outlet of the backflow shell extends into the second injection cavity to form a second mixing cavity.

Furthermore, the flow area of the inner pore channel of the nozzle body from the jet inlet to the jet hole is gradually reduced, a small-angle conical surface is arranged near the jet hole, and the jet hole is a small hole.

Further, the inner duct of the return housing is provided with a diffusion chamber having a gradually increasing flow area before the first outlet.

Further, the second injection cavity is an annular flow channel in front of the second mixing cavity.

Furthermore, the return flow housing is provided with a chamfer at the end of the annular flow passage.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and further features, objects, and advantages of the invention will become apparent. The drawings and their description depict exemplary embodiments of the invention for the purpose of illustrating the invention and are not to be construed as unduly limiting the invention. In the drawings:

fig. 1 is a schematic view of a composite ejector according to an embodiment of the present invention;

the reference numerals have the meanings given below: 01 nozzle body, 02 efflux entry, 03 backward flow entry, 04 efflux hole, 05 bypass entry, 06 annular runner, 07 second export, 08 second mixing chamber, 09 first export, 10 diffusion chamber, 11 second draw and penetrate chamber, 12 bypass casing, 13 first mixing chamber, 14 backward flow casings, 15 first draw and penetrate the chamber.

Detailed Description

In order to better understand the technical solution of the present invention, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them.

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1, a composite ejector is characterized by comprising:

01 the nozzle body is provided with an internal pore canal along the shaft, high-pressure hydrogen enters the internal pore canal from a 02 jet inlet, and the two ends of the internal pore canal are provided with a 02 jet inlet and a 04 jet hole;

the 14 backflow shell is radially provided with a 03 backflow inlet, an inner pore passage is axially arranged, the tail end of the inner pore passage is a 09 first outlet, the 14 backflow shell is sleeved outside the 01 nozzle body to form a 15 first injection cavity, and low-pressure mixed gas enters the 15 first injection cavity from the 03 backflow inlet;

the 12-bypass shell is radially provided with a 05-bypass inlet, an inner pore passage is axially arranged, the tail end of the inner pore passage is a 07 second outlet, the 12-bypass shell is sleeved outside the 14-backflow shell to form an 11 second injection cavity, and high-pressure hydrogen enters the 11 second injection cavity from the 05-bypass inlet;

01, a 04 jet hole of a nozzle body extends into a 15 first injection cavity to form a 13 first mixing cavity; and a 09 first outlet of the 14 backflow shell extends into the 11 second injection cavity to form a 08 second mixing cavity.

In order to accelerate the high-pressure hydrogen at the 02 jet inlet to a higher speed, the flow area of an internal pore passage of the 01 nozzle body from the 02 jet inlet to the jet hole is gradually reduced, a small-angle conical surface is arranged at the position close to the 04 jet hole, and the 04 jet hole is a cylindrical small hole.

In order to reduce the flow resistance from the 03 return inlet to the 13 first mixing chamber, the 01 nozzle body head and the 14 return housing are conical surfaces matching at the end of the 15 first injection chamber.

In order to make the flow field at the first mixing cavity 13 smoothly transit and make the fluid speed-reducing and pressure-increasing at the diffusion cavity 10, the internal channel of the backflow shell 14 has a circular arc transition between the conical surface at the first mixing cavity 13 and the cylindrical surface, and the diffusion cavity 10 with gradually increasing flow area is arranged before the first outlet 09.

In order to accelerate the hydrogen at the inlet of the bypass 05 to a higher speed, negative pressure relative to the first outlet 09 is formed at the second mixing cavity 11, the flow area of the second ejector cavity 11 is gradually reduced, and a 06 annular flow passage is formed before the second mixing cavity 08.

In order to make the fluid in the 06 annular flow passage meet the fluid in the 09 first outlet, the 14 return casing is provided with a chamfer at the end of the 06 annular flow passage, and the 12 bypass casing is provided with a flange matched with the chamfer.

The high-speed fluid flowing out of the 04 jet hole forms negative pressure relative to a 03 backflow inlet at the 13 first mixing cavity, and drives 15 low-pressure mixed gas in the 15 first injection cavity to move in an accelerated manner.

The high-speed fluid flowing out of the 06 annular flow passage forms negative pressure relative to the 09 first outlet at the 08 second mixing cavity, and drives the fluid in the 09 first outlet to move in an accelerated mode.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. The utility model discloses be not limited to and be applied to solenoid valve technical field, still include other technical field who need use the ejector product. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite ejector comprising:

the nozzle body (01) is provided with an inner pore canal along the shaft, and the two ends of the inner pore canal are provided with a jet inlet (02) and a jet hole (04);

the backflow shell (14) is provided with a backflow inlet (03) in the radial direction and an internal pore channel in the axial direction, the tail end of the internal pore channel is a first outlet (09), and the backflow shell (14) is sleeved outside the nozzle body (01) to form a first injection cavity (15);

the bypass shell (12) is provided with a bypass inlet (05) in the radial direction, an inner pore passage is arranged along the axial direction, the tail end of the inner pore passage is a second outlet (07), and the bypass shell (12) is sleeved outside the backflow shell (14) to form a second injection cavity (11);

the method is characterized in that: a jet hole (04) of the nozzle body (01) extends into the first injection cavity (15) to form a first mixing cavity (13); and a first outlet (09) of the backflow shell (14) extends into the second injection cavity (11) to form a second mixing cavity (08).

2. The composite ejector as claimed in claim 1, wherein the flow area of the inner pore passage of the nozzle body (01) from the jet inlet (02) to the jet hole (04) is gradually reduced, a small-angle conical surface is formed at a position close to the jet hole (04), and the jet hole (04) is a small hole.

3. The composite ejector according to claim 1, characterized in that the internal duct of the return housing (14) is provided with a diffusion chamber (10) of gradually increasing flow area before the first outlet (09).

4. The compound injector as claimed in claim 1, characterized in that the second injection chamber (11) is preceded by a second mixing chamber (08) by an annular flow duct (06).

5. The composite ejector according to claim 1, characterized in that the return housing (14) is chamfered at the end of the annular flow duct (06).