CN114876887B

CN114876887B - Control valve, ejector, fuel cell system and vehicle

Info

Publication number: CN114876887B
Application number: CN202210375767.7A
Authority: CN
Inventors: 李学锐; 马义; 张剑; 刘利连; 李波
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2023-12-19
Anticipated expiration: 2042-04-11
Also published as: CN114876887A

Abstract

The invention discloses a control valve, an ejector, a fuel cell system and a vehicle, and belongs to the technical field of vehicles. The control valve includes: the valve body is provided with a main flow channel, a plurality of outlet flow channels, a plurality of through cavities and a plurality of inlet flow channels, wherein the main flow channel is respectively communicated with the plurality of through cavities through the plurality of inlet flow channels, and the plurality of through cavities are correspondingly communicated with the plurality of outlet flow channels one by one; the plurality of through cavities comprise a normally open cavity and a plurality of control cavities, and at least one compressible valve core assembly is arranged in the control cavities; one end of the at least one compressible valve core component is abutted or separated from the opening of the corresponding inlet flow channel under the combined action of fluid and elastic deformation force of the compressible valve core component. The control valve, the ejector, the fuel cell system and the vehicle realize the recycling of hydrogen with different flows under different loads, and the full-working-condition hydrogen recycling requirement of the fuel cell system is met.

Description

Control valve, ejector, fuel cell system and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a control valve, an ejector, a fuel cell system and a vehicle.

Background

Along with the increasing severity of the problems of global environment, energy sources and the like, the fuel cell automobile is considered as the most promising energy power device in the future due to the advantages of no pollution, high energy conversion efficiency, wide raw material sources and the like.

The design scheme of the hydrogen supply system of the PEMFC (proton exchange membrane fuel cell) is divided into hydrogen recycling and hydrogen-free recycling. The hydrogen-free recycling has high requirements on the performance of the fuel cell, is unfavorable for the high-efficiency use of anode fuel, and is unfavorable for the service life of the fuel cell system. The hydrogen can be used in a recycling way, so that the hydrogen can be used efficiently, and the maintenance and management of the electric pile are facilitated. Therefore, the PEMFC hydrogen supply system mostly adopts a hydrogen recycling scheme.

At present, according to factors such as power requirements, performance of parts, efficiency and the like of a PEMFC hydrogen supply system, a hydrogen circulation scheme of a vehicle-mounted fuel cell system mainly comprises a hydrogen circulation pump, an ejector and the combination of the hydrogen circulation pump and the ejector. Compared with a hydrogen circulating pump, the ejector has the advantages of simple structure, reliable operation, low noise and no extra power consumption, so that the ejector is mainly used in the PEMFC hydrogen supply system.

However, in the prior art, the ejector can only meet the ejection requirement of a certain working condition section, and when the operation working condition deviates from the design range (the flow is too low or too high), the ejection capacity of the ejector can be rapidly reduced, and the ejection equivalent ratio does not meet the use requirement of the fuel cell system, so that the performance is unqualified.

Disclosure of Invention

The invention provides a control valve, an ejector, a fuel cell system and a vehicle, which solve or partially solve the technical problem that the ejector in the prior art cannot meet the power change requirement of a PEMFC system, so that the performance is unqualified.

In order to solve the above technical problems, the present invention provides a control valve comprising: a valve body and a plurality of compressible valve core assemblies; the valve body is internally provided with a main flow channel, a plurality of outlet flow channels, a plurality of through cavities and a plurality of inlet flow channels, wherein the main flow channel is respectively communicated with the plurality of through cavities through the plurality of inlet flow channels, and the plurality of through cavities are correspondingly communicated with the plurality of outlet flow channels one by one; the through cavity comprises a normally open cavity and a plurality of control cavities; at least one compressible valve core component is arranged in the control cavity; one end of the at least one compressible valve core component is abutted or separated from the opening of the corresponding inlet flow channel under the combined action of fluid and elastic deformation force of the compressible valve core component.

Further, the compressible valve cartridge assembly includes: a seal for interfering with or separating from the opening; and one end of the elastic piece acts on the cavity wall of the control cavity, and the other end of the elastic piece acts on the sealing piece.

Further, the seal includes: a sealing part for abutting against or separating from the opening; the guide rod is connected to the sealing part, and the elastic piece is sleeved on the guide rod and is abutted to the sealing part.

Further, a sealing gasket is arranged at the end part of the sealing part, which is away from the guide rod.

Further, the compressible valve cartridge assembly further comprises: the sealing sleeve is arranged in the control cavity and sleeved on the guide rod; the elastic piece is arranged between the sealing part and the sealing sleeve.

Further, the sealing sleeve comprises: the connecting part is movably arranged in the control cavity; the guide part is connected with the connecting part, and the guide rod is slidably arranged in the connecting part and the guide part.

Further, an installation internal thread is formed on the inner wall of the control cavity, an installation external thread is formed on the outer wall of the sealing sleeve, and the installation internal thread is meshed with the installation internal thread.

Further, a plurality of operation holes are formed in the end portion, away from the guide rod, of the sealing sleeve.

Further, a plurality of sealing valve seats are arranged in the valve body, and the sealing valve seats extend into the through cavities in a one-to-one correspondence mode.

Further, the sealing valve seat includes: the seat body is arranged in the through cavity, and a channel is formed in the valve body so as to form the inlet flow channel.

Based on the same inventive concept, the application also provides an ejector, which comprises an ejector body, a nozzle and a control valve, wherein the valve body is communicated with the ejector body through the nozzle.

Further, the ejector body is provided with a circulating hydrogen inlet, a first accommodating cavity, a second accommodating cavity and a conveying flow channel, and the circulating hydrogen inlet is communicated with the conveying flow channel; the valve body is arranged in the first accommodating cavity, the nozzle is arranged in the second accommodating cavity, and the nozzle is communicated with the conveying flow channel.

Further, the delivery flow channel includes: the injection section is communicated with the nozzle, and the circulating hydrogen inlet is communicated with the injection section; the mixing section is communicated with the injection section; and the diffusion section is communicated with the mixing section.

Further, the size of the valve body is matched with the size of the first accommodating cavity, and the shape of the valve body is matched with the shape of the first accommodating cavity.

Further, the nozzle includes: a connecting disc and a body; the connecting disc is connected with the body; the connecting disc is provided with a plurality of nozzle inlet flow passages and a plurality of connecting flow passages, and the nozzle inlet flow passages are communicated with the corresponding outlet flow passages of the control valve; the body is provided with a plurality of spray holes, the first ends of the spray holes are communicated with the corresponding connecting runners, and the second ends of the spray holes are communicated with the injection body.

Further, one of the end face of the connecting disc, which faces the valve body, and the end face of the valve body, which faces the connecting disc, is provided with a plurality of positioning holes, and the other one of the end faces of the connecting disc, which faces the valve body, is provided with a plurality of positioning pieces which can be embedded in the corresponding positioning holes.

Further, a sealing gasket is arranged between the valve body and the nozzle.

Further, the ejector further comprises: a proportional valve; the proportional valve is arranged on the injection body and is communicated with the main flow channel.

Further, the proportional valve includes: proportional valve body and proportional valve seat; the proportional valve body is connected with the proportional valve seat; the proportion disk seat with the injection body is connected, offer air supply runner and venthole on the proportion disk seat, air supply runner passes through the venthole with the mainstream channel intercommunication.

Based on the same inventive concept, the application also provides a fuel cell system comprising the ejector.

Based on the same inventive concept, the present application also provides a vehicle including the fuel cell system.

One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:

because the valve body is provided with the main flow channel, the plurality of outlet flow channels, the plurality of through cavities and the plurality of inlet flow channels, the main flow channel is respectively communicated with the plurality of through cavities through the plurality of inlet flow channels, the plurality of through cavities are correspondingly communicated with the plurality of outlet flow channels one by one, the plurality of through cavities comprise the normally open cavity and the plurality of control cavities, at least one compressible valve core component is arranged in the control cavity, one end of the at least one compressible valve core component is abutted or separated with the opening of the corresponding inlet flow channel under the combined action of the elastic deformation force of the fluid and the compressible valve core component, when the fuel cell system is in a low power section, the fluid is supplied to the fuel cell system through the main flow channel, the inlet flow channels, the normally open cavity and the outlet flow channels in sequence, at the moment, the acting force generated by the fluid on one end of the compressible valve core component is smaller than the elastic deformation force of the compressible valve core component, when the fuel cell system is in a high-medium power section, the flow rate of fluid entering the main flow channel is increased, so that the air pressure of the fluid is increased, at the moment, the acting force of the fluid on one end of the compressible valve core component is larger than the elastic deformation force of the compressible valve core component, the fluid enters the inlet flow channel from the main flow channel, the compressible valve core component is pushed by the fluid, the opening of the compressible valve core component corresponding to the inlet flow channel is separated, the inlet flow channel is communicated with the control cavity, the fluid is sequentially supplied to the fuel cell system through the inlet flow channel, the control cavity and the outlet flow channel, and the flow rate of the fluid supplied to the fuel cell system is increased, therefore, the fluid with different flow rates can be selected to enter the main flow channel according to the power change of the fuel cell system, so as to realize pushing the quantity of the compressible valve core component meeting the power requirement of the fuel cell system, and then the hydrogen recycling of different flows under different loads is realized, and the hydrogen recycling requirement of the fuel cell system under all working conditions is met.

Drawings

FIG. 1 is a schematic diagram of a control valve according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

FIG. 3 is a schematic view of the structure of a valve body of the control valve of FIG. 1;

FIG. 4 is a schematic radial cross-sectional view of the valve body of FIG. 3;

FIG. 5 is an axial cross-sectional schematic view of the valve body of FIG. 3;

FIG. 6 is a schematic illustration of the seal of the compressible valve cartridge assembly of FIG. 1;

FIG. 7 is a schematic illustration of the seal cartridge of the compressible valve cartridge assembly of FIG. 1;

FIG. 8 is a schematic view of the control valve of FIG. 1 in a first operating state;

FIG. 9 is a schematic view of a second operating condition of the control valve of FIG. 1;

FIG. 10 is a schematic view of a third operating condition of the control valve of FIG. 1;

FIG. 11 is a schematic diagram of an ejector according to an embodiment of the present invention;

FIG. 12 is a schematic view of the nozzle of the eductor of FIG. 11;

FIG. 13 is a bottom view of the nozzle of FIG. 12;

fig. 14 is a cross-sectional view of the nozzle of fig. 12.

Detailed Description

Referring to fig. 1 to 5, a control valve according to an embodiment of the present invention includes: a valve body 1 and a plurality of compressible valve core assemblies 2.

The valve body 1 is provided with a main flow channel 1-1, a plurality of outlet flow channels 1-2, a plurality of through cavities 1-3 and a plurality of inlet flow channels 3-1 along the axial direction, the main flow channel 1-1 is respectively communicated with the plurality of through cavities 1-3 through the plurality of inlet flow channels 3-1, and the plurality of through cavities 1-3 are correspondingly communicated with the plurality of outlet flow channels 1-2 one by one.

The plurality of through cavities 1-3 comprises a normally open cavity and a plurality of control cavities.

At least one compressible valve core component 2 is arranged in the control cavity, and one end of the at least one compressible valve core component 2 is abutted or separated from the opening of the corresponding inlet flow channel 3-1 under the combined action of fluid and elastic deformation force of the compressible valve core component 2.

In the specific embodiment of the application, a main flow channel 1-1, a plurality of outlet flow channels 1-2, a plurality of through cavities 1-3 and a plurality of inlet flow channels 3-1 are axially formed in a valve body 1, the main flow channel 1-1 is respectively communicated with the plurality of through cavities 1-3 through the plurality of inlet flow channels 3-1, the plurality of through cavities 1-3 are correspondingly communicated with the plurality of outlet flow channels 1-2 one by one, the plurality of through cavities 1-3 comprise a normally open cavity and a plurality of control cavities, at least one compressible valve core assembly 2 is arranged in the control cavity, one end of the at least one compressible valve core assembly 2 is abutted against or separated from the opening of the corresponding inlet flow channel 3-1 under the combined action of elastic deformation force of fluid and the compressible valve core assembly 2, so when the fuel cell system is in a low power section, fluid is sequentially supplied to the fuel cell system through the main flow channel 1-1, the inlet flow channel 3-1, the normally open cavity and the outlet flow channel 1-2, at this time, the acting force of the fluid on one end of the compressible valve core component 2 is smaller than the elastic deformation force of the compressible valve core component 2, the compressible valve core component 2 is in conflict with the opening of the corresponding inlet flow channel 3-1, when the fuel cell system is in a high-medium power section, the flow rate of the fluid entering the main flow channel 1-1 is increased, and then the air pressure of the fluid is increased, at this time, the acting force of the fluid on one end of the compressible valve core component 2 is larger than the elastic deformation force of the compressible valve core component 2, the fluid enters the inlet flow channel 3-1 from the main flow channel 1-1, the fluid pushes the compressible valve core component 2, and the action end of the compressible valve core component 2 is separated from the opening of the corresponding inlet flow channel 3-1, the inlet flow channel 3-1 is communicated with the control cavity, fluid is sequentially supplied to the fuel cell system through the inlet flow channel 3-1, the control cavity and the outlet flow channel 1-2, and the fluid flow rate supplied to the fuel cell system is increased, so that different flow rates of fluid can be selected to enter the main flow channel 1-1 according to the power change of the fuel cell system, the number of compressible valve core assemblies 2 meeting the power requirement of the fuel cell system is pushed, the recirculation of different flow rates of fluid under different loads is further realized, and the full-working-condition fluid circulation requirement of the fuel cell system is met.

In this embodiment, the fluid may be hydrogen.

In the present embodiment, the main flow passage 1-1 is provided in the valve body 1 along the axial direction of the valve body 1, the plurality of outlet flow passages 1-2 are provided in the valve body 1 along the axial direction of the valve body 1, the plurality of through cavities 1-3 are provided in the valve body 1 along the radial direction of the valve body 1, and the plurality of inlet flow passages 3-1 are provided in the valve body 1 along the radial direction of the valve body 1 so as to facilitate the flow of fluid.

In the embodiment, the through cavities 1-3 are uniformly arranged at equal intervals, so that the flow of hydrogen is facilitated.

In the present embodiment, a blind hole is opened in the middle of the valve body 1 to form a main flow passage 1-1.

In the present embodiment, since the inlet flow channels 3-1 have a flow dividing effect on the hydrogen gas, the diameter of the inlet flow channels 3-1 is smaller than that of the main flow channel 1-1, ensuring that the flow rate entering each inlet flow channel 3-1 is sufficient and also ensuring that the intake air is sufficient.

In the embodiment, the central axis of the through cavity 1-3 is perpendicularly intersected with the central axis of the valve body 1, the central axis of the outlet flow passage 1-2 is parallel with the central axis of the valve body 1, and the central axis of the outlet flow passage 1-2 is perpendicularly intersected with the central axis of the through cavity 1-3, so that the assembly is convenient.

Specifically, a plurality of sealing valve seats 3 are arranged in the valve body 1, and the plurality of sealing valve seats 3 extend into the plurality of through cavities 1-3 in a one-to-one correspondence manner. In the present embodiment, the sealing valve seat 3 does not intersect with the central axis of the outlet flow passage 1-2 to ensure smooth flow of hydrogen gas.

Specifically, the sealing valve seat includes: 3-3 parts of a seat body. The base body 3-3 is arranged in the through cavity, and a channel is arranged in the base body 3-3 to form an inlet runner 3-1. In the present embodiment, the flange is formed at the edge of the end face of the through cavity 1-3 facing the main flow passage 1-1 to form the seat body 3-3, so that the cost can be reduced.

Specifically, the compressible valve cartridge assembly 2 includes: a sealing member 2-1 and an elastic member 2-3.

The seal 2-1 is intended to interfere with or separate from the opening.

One end of the elastic member 2-3 acts on the wall of the control chamber, and the other end acts on the sealing member 2-1. In this embodiment, the elastic member 2-3 may be a spring. Of course, in other embodiments, the elastic member 2-3 may be an elastic member such as a rubber pad.

When the fuel cell system is in a low power section, the thrust generated by hydrogen is smaller than the elastic deformation force generated by the elastic piece 2-3, the elastic piece 2-3 enables the sealing piece 2-1 to be in contact with the opening of the inlet flow channel 3-1, the opening of the inlet flow channel 3-1 is cut off, and the hydrogen is supplied to the fuel cell system through the main flow channel 1-1, the inlet flow channel 3-1, the normally open cavity and the outlet flow channel 1-2 in sequence. When the fuel cell system is in a high-medium power section, the flow rate of hydrogen entering the main flow channel 1-1 is increased, and then the air pressure of the hydrogen is increased, so that the thrust generated by the hydrogen is larger than the elastic piece 2-3 to generate elastic deformation force, the hydrogen enters the main flow channel 1-1 from the main flow channel 1-1 to enter the inlet flow channel 3-1, the hydrogen pushes the sealing piece 2-1, the sealing piece 2-1 slides, the sealing piece 2-1 compresses the elastic piece 2-3 to enable the sealing piece 2-1 to be separated from the opening of the inlet flow channel 3-1, the inlet flow channel 3-1 is communicated with the control cavity, the hydrogen is sequentially supplied to the fuel cell system through the inlet flow channel 3-1, the control cavity and the outlet flow channel 1-2, and the flow rate of the hydrogen supplied to the fuel cell system is increased, therefore, the hydrogen with different flow rates can be selected to enter the main flow channel 1-1 according to the power change of the fuel cell system, so that the quantity of the sealing piece 2-1 meeting the power requirement of the fuel cell system is pushed, the hydrogen recycling of the fuel cell system under different loads is realized, and the hydrogen recycling requirements of different flow rates under different loads are met.

Referring to fig. 6, in particular, the seal 2-1 includes: sealing part 2-11 and guide rod 2-12.

The sealing portions 2-11 are intended to interfere with or separate from the opening.

The guide rod 2-12 is connected to the sealing part 2-11, and the elastic piece 2-3 is sleeved on the guide rod 2-12 and is abutted to the sealing part 2-11. In this embodiment, the sealing portion 2-11 is coaxial with the guide rod 2-12.

Wherein, the guide rod 2-12 slides in the through cavity to drive the sealing part 2-11 to collide with or separate from the sealing valve seat 3 so as to realize opening or closing of the opening of the inlet flow channel 3-1.

In this embodiment, when the fuel cell system is in the low power section, the thrust force generated by the hydrogen is smaller than the elastic deformation force generated by the elastic member 2-3, the elastic member 2-3 makes the sealing portion 2-11 collide with the opening of the inlet flow channel 3-1, cuts off the opening of the inlet flow channel 3-1, and the hydrogen is supplied to the fuel cell system through the main flow channel 1-1, the inlet flow channel 3-1, the normally open cavity, and the outlet flow channel 1-2 in order. When the fuel cell system is in a high-medium power section, the flow rate of hydrogen entering the main flow channel 1-1 is increased, and then the air pressure of the hydrogen is increased, so that the thrust generated by the hydrogen is larger than the elastic piece 2-3 to generate elastic deformation force, the hydrogen enters the inlet flow channel 3-1 from the main flow channel 1-1, the hydrogen pushes the sealing part 2-11, the sealing part 2-11 drives the guide rod 2-12 to act, the sealing part 2-11 compresses the elastic piece 2-3, the sealing part 2-11 is separated from the opening of the inlet flow channel 3-1, the inlet flow channel 3-1 is communicated with the control cavity, the hydrogen is sequentially supplied to the fuel cell system through the inlet flow channel 3-1, the control cavity and the outlet flow channel 1-2, and the flow rate of the hydrogen supplied to the fuel cell system is increased, therefore, the hydrogen with different flow rates can be selected to enter the main flow channel 1-1 according to the power change of the fuel cell system, so that the quantity of the sealing piece 2-1 meeting the power requirement of the fuel cell system is pushed, and the hydrogen recycling of different flow rates under different loads is realized, and the full-condition hydrogen recycling requirement of the fuel cell system is met.

Specifically, the end of the sealing part 2-11 facing away from the guide rod 2-12 is provided with a sealing gasket 2-4. In the present embodiment, a gasket groove 2-13 is formed in an end portion of the sealing portion 2-11 facing away from the guide rod 2-12, and the gasket 2-4 is disposed in the gasket groove 2-13. Wherein, the sealing gasket 2-4 can be arranged in the sealing gasket groove 2-13 in an adhesive or interference mode, so that the sealing gasket 2-4 can be firmly arranged in the sealing gasket groove 2-13, and the sealing gasket 2-4 and the sealing element 2-1 can move integrally.

Specifically, the gasket 2-4 may abut against the sealing valve seat 3 to close the opening of the inlet flow passage 3-1. The end face of the sealing valve seat 3, which faces away from the main flow channel 1-1, is annular to form a sealing annular surface 3-2, and the sealing annular surface 3-2 can be abutted against the sealing gasket 2-4 so as to realize that the sealing gasket 2-4 can close the inlet flow channel 3-1. In this embodiment, the diameter of the sealing toroidal surface 3-2 is smaller than the diameter of the sealing gasket 2-4, ensuring the sealing effect of the sealing gasket 2-4.

In the embodiment, the axial jumping amount of the sealing circular ring surface 3-2 is 0.05mm, so that the flatness of the sealing circular ring surface 3-2 is ensured, the sealing gasket 2-4 is tightly attached to the sealing circular ring surface 3-2, and the sealing effect of the sealing gasket 2-4 is further ensured.

Referring to fig. 7, in particular, the compressible valve cartridge assembly 2 further comprises: 2-2 of sealing sleeve.

The sealing sleeve 2-2 is arranged in the control cavity and sleeved on the guide rod 2-12. In this embodiment, the diameter of the sealing portion 2-11 is larger than the diameter of the guide rod 2-12, so as to prevent the sealing portion 2-11 from entering the sealing sleeve 2-2, thereby realizing limit. Meanwhile, the axial length of the sealing part 2-11 along the control cavity is smaller than that of the guide rod 2-12 along the control cavity, so that the stroke of the sealing piece 2-1 is ensured.

The elastic member 2-3 is arranged between the sealing part 2-11 and the sealing sleeve 2-2, one end of the elastic member 2-3 acts on the sealing sleeve 2-2, and the other end acts on the sealing part 2-11.

In this embodiment, the sealing sleeve 2-2 is movably disposed in the control cavity along the radial direction, so that the sealing sleeve 2-2 moves in the control cavity along the radial direction according to different power requirements of the fuel cell system, at this time, the sealing member 2-1 is in contact with the opening of the inlet flow channel 3-1, the sealing sleeve 2-2 and the sealing member 2-1 move relatively, the sealing member 2-1 compresses the elastic member 2-3, so that the elastic member 2-3 generates a pretightening force, and different pretightening forces generated by the elastic member 2-3 are used for setting different opening separation pressures of the sealing member 2-1 and the inlet flow channel 3-1, so that the injection requirements of the fuel cell system under different working conditions can be met.

Specifically, the seal cover includes: the connecting parts 2-21 and the guiding parts 2-23.

The connecting parts 2-21 are movably arranged in the control cavity. The connecting part 2-21 is internally provided with a first guide groove 2-22.

The guiding part 2-23 is connected with the connecting part 2-21, and the guide rod 2-12 is slidably arranged in the connecting part 2-21 and the guiding part 2-23. The guide part 2-23 is internally provided with a second guide groove 2-24 communicated with the first guide groove 2-22, and the guide rod 2-12 is slidably arranged in the first guide groove 2-22 and the second guide groove 2-24. In this embodiment, the shapes of the first guide groove 2-22 and the second guide groove 2-24 are cylindrical, the shape of the guide rod 2-12 of the sealing member 1-2 is cylindrical, the outer surface straightness of the guide rod 2-12 is high and smooth, the guide rod 2-12 and the first guide groove 2-22 and the second guide groove 2-24 form close tolerance fit, that is, the diameter of the guide rod 2-12 is matched with the diameters of the first guide groove 2-22 and the second guide groove 2-24, so that when the guide rod 2-12 moves axially in the first guide groove 2-22 and the second guide groove 2-24, the guidance quality is good, friction in the moving process is small, and the opening or closing process of the opening of the inlet flow channel 3-1 is realized, and the guide rod 2-12 has good response characteristics.

In this embodiment, in the present embodiment, the connection portion 2-21 is movably disposed in the control cavity along the radial direction, so that the connection portion 2-21 moves in the control cavity along the radial direction according to different power requirements of the fuel cell system, at this time, the sealing member 2-1 abuts against the opening of the inlet flow channel 3-1, the connection portion 2-21 moves relatively to the guide rod 2-12 of the sealing member 2-1, the sealing portion 2-11 of the sealing member 2-1 compresses the elastic member 2-3, so that the elastic member 2-3 generates a pre-tightening force, and different pre-tightening forces generated by the elastic member 2-3 are used to set different opening separation pressures of the sealing member 2-1 and the inlet flow channel 3-1, so as to meet the injection requirements under different working conditions of the fuel cell system.

In the present embodiment, the edge of the end face of the second guide groove 2-24 facing away from the first guide groove 2-22 is provided with an assembly chamfer 2-25, so that the guide rod 2-12 of the sealing member 1-2 can enter the second guide groove 2-24.

Wherein the connecting part 2-21 is connected with the end surface of the control cavity facing away from the main flow channel 1-1, and the guide rod 2-12 of the sealing element 1-2 can slide in the first guide groove 2-22 and the second guide groove 2-24.

In this embodiment, when the sealing portion 2-11 of the sealing member 2-1 abuts against the opening of the inlet flow channel 3-1, the matching length of the guide rod 2-12 of the sealing member 2-1 and the first guide groove 2-22 and the second guide groove 2-24 of the sealing sleeve 2-2 is not less than 1.2d (d is the inner diameters of the first guide groove 2-22 and the second guide groove 2-24), so as to ensure sufficient guiding performance and avoid the phenomenon of jamming caused by the offset of the guide rod 2-12 of the sealing member 2-1.

In this embodiment, the present invention is not limited to this embodiment.

Specifically, a plurality of operation holes 2-5 are formed in the end portion, away from the guide rod 2-12, of the sealing sleeve 2-2.

The operation piece can be inserted into the operation hole 2-5, and the operation piece drives the sealing sleeve 2-2 to move in the control cavity along the radial direction, so that the moving distance of the sealing sleeve 2-2 in the control cavity can be conveniently adjusted, the pretightening force generated by the elastic piece 2-3 can be conveniently adjusted, and the operation is convenient.

Specifically, an inner wall of the control cavity is provided with an installation inner thread 1-31, an outer wall of the sealing sleeve 2-2 is provided with an installation outer thread 2-26, and the installation inner thread 2-26 is meshed with the installation inner thread 1-31. By adjusting the meshing positions of the mounting internal threads 2-26 and the mounting internal threads 1-31, the axial stroke of the sealing sleeve 2-2 in the control cavity is adjusted, the elastic piece 2-3 is compressed, different pre-tightening forces of the elastic piece 2-3 are formed, different opening separation pressures of the sealing piece 2-1 and the inlet runner 3-1 are set, and the injection requirements of the fuel system under different working conditions can be met.

In this embodiment, the mounting internal thread 2-26 is engaged with the mounting internal thread 1-31, and the sealing sleeve 2-2 is rotated to move the sealing sleeve 2-2 in the control cavity along the central axis of the control cavity, so as to compress the elastic member 2-3, thereby adjusting the compression amount of the elastic member 2-3, adjusting the pretightening force of the elastic member 2-3 on the sealing member 2-1, and the greater the compression amount is, the greater the pretightening force of the elastic member 2-3 is, and the greater the gas pressure is required to push the sealing member 2-1 away, so that the sealing member 2-1 is separated from the sealing valve seat 3.

In the present embodiment, the number of the through cavities 1-3 is three, that is, the through cavities 1-3 include a normally open cavity, a first control cavity and a second control cavity, and the opening pressure of the inlet flow channel 3-1 of the second control cavity is greater than the opening pressure of the inlet flow channel 3-1 of the first control cavity.

Referring to fig. 8, when the low power section of the fuel system is running, the pressure in the main flow channel 1-1 is P1, which is insufficient to push the sealing members 2-1 of the compressible valve core assemblies 2 of the first control chamber and the second control chamber open, only the normally open chamber is closed, and only the outlet flow channel 1-2 of the normally open chamber is correspondingly operated, so that the unreacted circulating hydrogen is ejected and reused.

Referring to fig. 9, when the power section in the fuel system is running, the pressure in the main flow channel 1-1 is P2, P2 is greater than P1, and at this time, the hydrogen pressure acting on the sealing member 2-1 of the first control chamber is sufficient to overcome the pretightening force of the elastic member 2-3, so as to jack up the sealing member 2-1 of the first control chamber, and the first control chamber passage and the outlet flow channel 1-2 corresponding to the first control chamber start to work. But the pressure of the P2 is not used for pushing the sealing element 2-1 of the second control cavity, the second control cavity is in a closed state, and the corresponding outlet flow passage 1-2 of the second control cavity does not work. In this state, only the normally open cavity and the first control cavity participate in the work, and the normally open cavity and the first control cavity jointly eject and recycle unreacted circulating hydrogen.

Referring to fig. 10, when the high power section of the fuel system is running, the pressure of the main flow channel continuously rises by P3, P3 is greater than P2, and the pressure of hydrogen acting on the sealing element 2-1 of the first control cavity is enough to overcome the pretightening force of the elastic element 2-3, so that the sealing element 2-1 of the first control cavity is pushed open, the first control cavity is in a passage, and the outlet flow channel 1-2 corresponding to the first control cavity starts to work; the pressure of the hydrogen acting on the sealing element 2-1 of the second control cavity is enough to overcome the pretightening force of the elastic element 2-3, the sealing element 2-1 of the second control cavity is jacked up, and the corresponding outlet flow channel 1-2 of the first control cavity is started to work; the normally open cavity, the first control cavity and the second control cavity work in the state, and unreacted circulating hydrogen is ejected and recycled in a combined mode.

By setting the separation pressure of the openings of the different control sealing elements 2-1 and the inlet flow channel 3-1 and combining the pressure values of the main flow channel 1-1 under different working conditions, the hydrogen recirculation with different flow under different loads is realized, and the full working condition hydrogen circulation requirement of the fuel cell system is met.

Based on the same inventive concept, the application further provides an ejector, the ejector adopts the control valve, the specific structure of the control valve refers to the above embodiments, and the control valve adopts all the technical schemes of all the embodiments, so that the ejector at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

Referring to fig. 11, an ejector comprises an ejector body 5, a nozzle 6 and a control valve, wherein a valve body 1 is communicated with the ejector body 5 through the nozzle 6, and the nozzle 6 conveys hydrogen passing through the valve body 1 into the ejector body 5.

Specifically, the ejector 5 is provided with a circulating hydrogen inlet 5-1, a first accommodating cavity, a second accommodating cavity and a conveying flow passage 5-2, and the circulating hydrogen inlet 5-1 is communicated with the conveying flow passage 5-2.

The valve body 1 is arranged in the first accommodating cavity, and the valve body 1 is supported by the first accommodating cavity. The nozzle 6 is provided in the second accommodation chamber, through which the nozzle 6 is supported. The nozzle 6 communicates with the delivery flow passage 5-2.

Wherein, hydrogen enters the nozzle 6 through the valve body 1, is conveyed to the conveying flow channel 5-2 by the nozzle 6, and circulated hydrogen enters the conveying flow channel 5-2 through the circulated hydrogen inlet 5-1, and is conveyed to the fuel cell system through the conveying flow channel 5-2.

In the embodiment, the nozzle 6 can be pressed in the second accommodating cavity, the valve body 1 is pressed in the first accommodating cavity, and the processing and assembling difficulty can be reduced by pressing the valve body 1 and the nozzle 6, so that a serialized product is formed; is beneficial to reducing the trial-manufacture processing difficulty of the ejector and reducing the cost.

Specifically, the delivery flow path 5-2 includes: 5-21 parts of injection section, 5-22 parts of mixing section and 5-23 parts of diffusion section.

The injection section 5-21 is communicated with the nozzle 6, and the circulating hydrogen inlet 5-1 is communicated with the injection section 5-21.

The mixing section 5-22 is communicated with the injection section 5-21.

The diffuser section 5-23 communicates with the mixing section 5-22.

The hydrogen enters the nozzle 6 through the valve body 1, is conveyed to the injection section 5-21 through the nozzle 6, the circulating hydrogen enters the injection section 5-21 through the circulating hydrogen inlet 5-1, the hydrogen entering through the nozzle 6 and the circulating hydrogen are in the mixing section 5-22, then conveyed to the diffusion section 5-23, and the mixed hydrogen is diffused by the diffusion section 5-23 and conveyed to the fuel cell system.

In the embodiment, the opening and closing states of the inlet flow channel 3-1 are regulated by the control valve, so that the working quantity and states of the spray holes 6-5 of the spray nozzle 6 are controlled, the excellent injection capacity of hydrogen at the outlet of the spray nozzle 6 in each power section of small, medium and large is ensured, unreacted complete circulating hydrogen at the circulating hydrogen inlet 5-1 is injected into the injection section 5-21 to continue to participate in reaction, and the hydrogen utilization rate is improved. After the injection of the hydrogen and the circulating hydrogen in the injection area 42 is completed, the hydrogen and the circulating hydrogen are fully mixed in the mixing section 5-22, and then are diffused by the diffusion section 5-23 and then output to the cathode of the fuel cell stack to participate in the reaction.

In particular, the diameter of the end of the ejection section 5-21 facing the nozzle 6 is greater than the diameter of the end of the ejection section 5-21 facing away from the nozzle 6. That is, the ejector sections 5-21 are in the shape of a circular truncated cone so as to facilitate the entry of hydrogen.

The end of the diffuser section 5-23 facing the mixing section 5-22 has a smaller diameter than the end of the ejector section 5-21 facing away from the mixing section 5-22. That is, the diffuser sections 5-23 are in a truncated cone shape, so that the hydrogen can be conveniently diffused, and the hydrogen can conveniently enter the cathode of the fuel cell stack to participate in the reaction.

Specifically, the size of the valve body 1 is matched with the size of the first accommodating cavity, and the shape of the valve body 1 is matched with the shape of the first accommodating cavity so as to seal the normally open cavity through the inner wall of the first accommodating cavity and avoid hydrogen dissipation. Of course, in other embodiments, a sealing block may be disposed at the end of the normally open cavity facing away from the main flow channel 1-1, and the normally open cavity is sealed by the sealing block to avoid dissipation of hydrogen. The shape of the sealing block is matched with the shape of the normally open cavity, and the size of the sealing block is matched with the shape of the normally open cavity, so that the sealing effect is ensured, and the dissipation of hydrogen is avoided.

Referring to fig. 13-14, the nozzle 6 includes: the connecting disc 6-1 and the body 6-2.

The connecting disc 6-1 is connected with the body 6-2. In the present embodiment, the connection disc 6-1 is embedded in the second accommodating cavity, and the body 6-2 is inserted in the injection section 5-21 of the conveying flow channel 5-2.

The connecting disc 6-1 is provided with a plurality of nozzle inlet flow passages 6-3 and a plurality of connecting flow passages 6-4, and the nozzle inlet flow passages 6-3 are communicated with the outlet flow passages 1-2 of the corresponding control valves.

The body 6-2 is provided with a plurality of spray holes 6-5, a first end of each spray hole 6-5 is communicated with the corresponding connecting runner 6-4, and a second end of each spray hole 6-5 is communicated with the ejector body 5.

In this embodiment, the hydrogen passing through the valve body 1 enters the connecting flow passage 6-4 through the nozzle inlet flow passage 6-3, is then conveyed into the injection hole 6-5 through the connecting flow passage 6-4, and is conveyed into the injection section 5-21 of the conveying flow passage 5-2 of the injection body 5 through the injection hole 6-5.

Specifically, one of the end face of the connecting disc 6-1 facing the valve body 1 and the end face of the valve body 1 facing the connecting disc 6-1 is provided with a plurality of positioning holes 7, the other one is provided with a plurality of positioning pieces 8, and the positioning pieces 8 can be embedded in the corresponding positioning holes 7 to realize positioning. In this embodiment, the end face of the connecting disc 6-1 facing the valve body 1 is provided with a plurality of positioning holes 7, the end face of the valve body 1 facing the connecting disc 6-1 is provided with a plurality of positioning pieces 8, and the positioning pieces 8 can be embedded in the corresponding positioning holes 7. Of course, in other embodiments, the end surface of the valve body 1 facing the connecting disc 6-1 is provided with a plurality of positioning holes 7, the end surface of the connecting disc 6-1 facing the valve body 1 is provided with a plurality of positioning pieces 8, and the positioning pieces 8 can be embedded in the corresponding positioning holes 7.

When the valve body 1 and the nozzle 6 are to be installed, the positioning piece 8 is embedded in the corresponding positioning hole 7 to realize positioning, so that the outlet flow passage 1-2 of the valve body 1 is ensured to be communicated with the corresponding nozzle inlet flow passage 6-3.

Specifically, the nozzle 6 has a truncated cone shape, and the diameter of the end of the body 6-2 facing the land 6-1 is larger than the diameter of the body 6-2 facing away from the land 6-1 and facing away from the body 6-2. That is, the shape of the nozzle 6 is in a truncated cone shape, so that the nozzle 6 can conveniently enter the injection section 5-2 of the conveying flow channel 5-2, the smooth entry of hydrogen into the injection section 5-2 of the conveying flow channel 5-2 is ensured, and the injection effect is ensured.

In the present embodiment, a sealing gasket 9 is provided between the valve body 1 and the nozzle 6 to seal the gap between the valve body 1 and the nozzle 6, thereby preventing hydrogen from escaping. Meanwhile, the valve body 1 is pressed on the sealing gasket 9, so that the sealing gasket 9 can be fully pressed, and the sealing effect is further ensured.

Specifically, the ejector further comprises: a proportional valve 10.

The proportional valve 10 is arranged on the ejector body 5, the proportional valve 10 is supported by the ejector body 5, meanwhile, the proportional valve 10 can be pressed on the sealing gasket 9 through the valve body 1, the sealing gasket 9 can be fully pressed, and the sealing effect is further guaranteed. The proportional valve 10 communicates with the main flow passage 1-1 for supplying fresh hydrogen to the main flow passage 1-1.

Specifically, the proportional valve 10 includes: the proportional valve body 10-1 and the proportional valve seat 10-2.

The proportional valve body 10-1 is connected with the proportional valve seat 10-2.

The proportional valve seat 10-2 is connected with the ejector body 5, the proportional valve seat 10-2 is provided with an air supply flow passage 10-21 and an air outlet hole 10-22, and the air supply flow passage 10-21 is communicated with the main flow passage 1-1 through the air outlet hole 10-22.

When fresh hydrogen is supplied to the ejector 5, the fresh hydrogen sequentially passes through the air supply flow channel 10-21 and the air outlet holes 10-22 to enter the main flow channel 1-1. Meanwhile, the opening of the air supply flow channel 10-21 is regulated by operating the proportional valve body 10-1 on the proportional valve seat 10-2, so that the flow rate of fresh hydrogen is regulated, and the air pressure of the hydrogen is changed.

Based on the same inventive concept, the present application further provides a fuel cell system, where the fuel cell system adopts the ejector, and the specific structure of the ejector refers to the above embodiments, and since the ejector adopts all the technical solutions of all the above embodiments, at least the ejector has all the beneficial effects brought by the technical solutions of the above embodiments, which are not described in detail herein.

Based on the same inventive concept, the present application further provides a vehicle, where the vehicle employs the fuel cell system, and the specific structure of the fuel cell system refers to the foregoing embodiments, and since the fuel cell system employs all the technical solutions of all the foregoing embodiments, at least all the beneficial effects brought by the technical solutions of the foregoing embodiments are not described herein in detail.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.

Claims

1. A control valve, comprising: a valve body and a plurality of compressible valve core assemblies;

the valve body is provided with a main flow channel, a plurality of outlet flow channels, a plurality of through cavities and a plurality of inlet flow channels, wherein the main flow channel is respectively communicated with the plurality of through cavities through the plurality of inlet flow channels, the plurality of through cavities are correspondingly communicated with the plurality of outlet flow channels one by one, and the plurality of through cavities are arranged at intervals;

the plurality of through cavities comprise a normally open cavity and a plurality of control cavities, and at least one compressible valve core assembly is arranged in the control cavities; one end of the at least one compressible valve core component is abutted or separated from the opening of the corresponding inlet flow channel under the combined action of fluid and elastic deformation force of the compressible valve core component;

the compressible valve cartridge assembly includes:

a seal for interfering with or separating from the opening;

an elastic member having one end acting on a wall of the control chamber and the other end acting on the sealing member;

the seal includes:

a sealing part for abutting against or separating from the opening;

the guide rod is connected to the sealing part, and the elastic piece is sleeved on the guide rod and is abutted to the sealing part.

2. The control valve of claim 1, wherein:

the end part of the sealing part, which is away from the guide rod, is provided with a sealing gasket.

3. The control valve of claim 1, wherein the compressible valve cartridge assembly further comprises:

the sealing sleeve is arranged in the control cavity and sleeved on the guide rod;

the elastic piece is arranged between the sealing part and the sealing sleeve.

4. A control valve according to claim 3, wherein the sealing sleeve comprises:

the connecting part is movably arranged in the control cavity;

the guide part is connected with the connecting part, and the guide rod is slidably arranged in the connecting part and the guide part.

5. The control valve of claim 4, wherein:

the inner wall of the control cavity is provided with an installation internal thread, the outer wall of the sealing sleeve is provided with an installation external thread, and the installation internal thread is meshed with the installation internal thread.

6. A control valve according to claim 3, characterized in that:

the end part of the sealing sleeve, which is away from the guide rod, is provided with a plurality of operation holes.

7. The control valve according to any one of claims 1-6, wherein:

the inside of valve body is equipped with a plurality of sealed disk seats, a plurality of sealed disk seats one-to-one stretch into in a plurality of logical chamber.

8. The control valve of claim 7, wherein the sealing valve seat comprises:

the base is arranged in the through cavity, and a channel is formed in the base to form the inlet flow channel.

9. An ejector comprising an ejector body, a nozzle and a control valve according to any one of claims 1 to 8, the valve body being in communication with the ejector body through the nozzle.

10. The eductor of claim 9 wherein:

the ejector body is provided with a circulating hydrogen inlet, a first accommodating cavity, a second accommodating cavity and a conveying flow channel, and the circulating hydrogen inlet is communicated with the conveying flow channel;

the valve body is arranged in the first accommodating cavity, the nozzle is arranged in the second accommodating cavity, and the nozzle is communicated with the conveying flow channel.

11. The eductor of claim 10 wherein the transfer flow passage comprises:

the injection section is communicated with the nozzle, and the circulating hydrogen inlet is communicated with the injection section;

the mixing section is communicated with the injection section;

and the diffusion section is communicated with the mixing section.

12. An injector as claimed in any one of claims 9 to 11 wherein the nozzle comprises: a connecting disc and a body;

the connecting disc is connected with the body;

the connecting disc is provided with a plurality of nozzle inlet flow passages and a plurality of connecting flow passages, and the nozzle inlet flow passages are communicated with the corresponding outlet flow passages of the control valve;

the body is provided with a plurality of spray holes, the first ends of the spray holes are communicated with the corresponding connecting runners, and the second ends of the spray holes are communicated with the injection body.

13. The eductor of claim 12 wherein:

the connecting disc is provided with a plurality of locating holes towards one of the end face of the valve body and the end face of the valve body towards the connecting disc, the other one of the end face of the connecting disc and the end face of the valve body towards the connecting disc is provided with a plurality of locating pieces, and the locating pieces can be embedded into the corresponding locating holes.

14. An injector as claimed in any one of claims 9 to 11 wherein:

and a sealing gasket is arranged between the valve body and the nozzle.

15. An injector as claimed in any one of claims 9 to 11 wherein the injector further comprises: a proportional valve;

the proportional valve is arranged on the injection body and is communicated with the main flow channel.

16. The eductor of claim 15 wherein the proportioning valve comprises: proportional valve body and proportional valve seat;

the proportional valve body is connected with the proportional valve seat;

the proportion disk seat with the injection body is connected, offer air supply runner and venthole on the proportion disk seat, air supply runner passes through the venthole with the mainstream channel intercommunication.

17. A fuel cell system comprising an ejector according to any one of claims 9 to 16.

18. A vehicle comprising the fuel cell system according to claim 17.