CN117967616A - Ejector, fuel cell system and vehicle - Google Patents

Abstract

The application discloses an ejector, a fuel cell system and a vehicle, and solves the technical problem of low reliability of vehicles in the prior art. The ejector comprises a body and a nozzle, wherein the body is provided with an ejection channel and a bypass channel, the nozzle is arranged in the ejection channel, and the ejection channel of the nozzle is communicated with the ejection channel; the nozzle is provided with a communication hole, the communication hole is positioned at the upstream of the secondary flow inlet of the injection channel, and the injection channel is communicated with the outlet of the bypass channel through the communication hole. The ejector provided by the application can at least provide power for the vehicle in idle speed, and the reliability of the vehicle is improved.

Description

Ejector, fuel cell system and vehicle

Technical Field

The application belongs to the technical field of ejectors, and particularly relates to an ejector, a fuel cell system and a vehicle.

Background

The ejector is a device for ejecting one high-speed high-energy flow (liquid flow, gas flow or other substance flow) into the other low-speed low-energy flow, jet flows into the mixing chamber through a convergent nozzle, guided jet flows are arranged around the jet flows, the energy of the ejected flow is transferred to the ejected flow through the boundary mixing action, a mixing area formed by mixing is gradually enlarged to fill the whole mixing chamber, and the flow is almost uniform through a section of mixing process to the outlet of the mixing chamber.

The gas exhausted from the electric pile in the fuel cell system contains unreacted hydrogen, and the hydrogen can be returned to the electric pile for reuse as an ejector flow through the ejector.

In the prior art, the ejector is connected with the proportional valve, high-speed high-energy flow, namely high-pressure hydrogen, passes through the proportional valve and then is introduced into the ejector, but the proportional valve can possibly be blocked or can not be opened due to faults in use, once the proportional valve is blocked or can not be opened due to faults, the fuel cell can not work, and the reliability of the vehicle is reduced.

Disclosure of Invention

The application provides an ejector, a fuel cell system and a vehicle, which are used for solving the technical problems that the ejector cannot supply hydrogen raw materials to the fuel cell and the reliability of the vehicle is low because the prior proportional valve is blocked or fails to open.

In a first aspect of the application there is provided an ejector comprising:

The body is provided with an injection channel and a bypass channel;

The injection channel of the nozzle is communicated with the injection channel;

the nozzle is provided with a communication hole, the communication hole is positioned at the upstream of the secondary flow inlet of the injection channel, and the injection channel is communicated with the outlet of the bypass channel through the communication hole.

In some embodiments, the nozzle comprises a mounting section and a spraying section which are sequentially arranged along the axial direction, the cross-sectional dimension of the mounting section is larger than that of the spraying section, and the communication hole is formed in the mounting section.

In some embodiments, the mounting section is provided with a communication groove extending in a circumferential direction of the nozzle, the communication groove communicating with both the bypass passage and the communication hole.

In some embodiments, the communication groove is a ring groove; the size of the ring groove is not smaller than the aperture of the outlet of the bypass passage along the axial direction of the nozzle.

In some embodiments, the bypass passage is in parallel with the ejector passage.

In some embodiments, the inner wall of the injection channel is provided with a guide surface, and the inlet of the bypass channel is positioned on the guide surface.

In some embodiments, the eductor further comprises a flow regulating valve disposed between the primary inflow and the secondary inflow of the eductor passageway, the nozzle being proximate to the output end of the flow regulating valve.

In some embodiments, the injection channel comprises a first channel section and a second channel section which are arranged at an angle, the body is provided with a mounting hole, the mounting hole corresponds to the position of the communication position of the first channel section and the second channel section, the valve body of the flow regulating valve is mounted in the mounting hole, the output end extends into the second channel section, and the nozzle is positioned in the second channel section.

In some embodiments, the output end of the flow regulating valve is disposed coaxially with the nozzle; the nozzle is matched with the output end through a stepped shaft and a stepped hole structure.

In some embodiments, a middle portion of the output end abuts the nozzle; a sealing ring is arranged between the output end and the nozzle, and the sealing ring surrounds the middle part of the output end in a compressed state; the edge of the output end is arranged with the end face clearance of the nozzle.

In some embodiments, the nozzle is an interference or transition fit with the injection passage; the nozzle is of a stepped shaft structure, and a shaft shoulder of the nozzle is abutted with the injection channel.

In some embodiments, a valve cartridge of the flow regulating valve includes a valve cartridge body and a gasket connected to the valve cartridge body; the valve body of the flow regulating valve is provided with a convex ring for acting on the sealing gasket.

In some embodiments, the device further comprises an opening and closing valve for opening and closing a primary inflow port of the injection channel and/or a pressure sensor for detecting the medium pressure at an air outlet of the injection channel.

In a second aspect of the application, there is provided a fuel cell system comprising the ejector described above.

In a second aspect of the present application, there is provided a vehicle including the fuel cell system described above.

The ejector provided by the embodiment of the application comprises a body and a nozzle, wherein the body is provided with an ejection channel and a bypass channel; the nozzle is arranged in the injection channel, the injection channel of the nozzle is communicated with the injection channel, the nozzle is provided with a communication hole, the communication hole is positioned at the upstream of the secondary flow inlet of the injection channel, and the injection channel is communicated with the outlet of the bypass channel through the communication hole.

The body of the ejector provides a mounting structure for the nozzle and provides an ejection channel and a bypass channel for hydrogen circulation, wherein a primary inflow port of the ejection channel is a high-pressure hydrogen inflow port, a secondary inflow port is a backflow hydrogen inflow port of the fuel cell system, and a hydrogen outflow port after the backflow hydrogen is ejected by the high-pressure hydrogen at an air outlet.

The nozzle is a core component of the ejector, and the bypass channel is communicated with the injection channel of the nozzle through the communication hole, so that the nozzle can introduce the bypass channel and the high-pressure hydrogen entering from the primary inflow port into the mixing section of the injection channel.

Because the communication hole is positioned at the upstream of the secondary inlet of the injection channel, that is to say, the outlet of the bypass channel is positioned at the upstream of the secondary inlet, and the high-pressure gas of the bypass channel is sourced from the outside and does not depend on the high-pressure hydrogen in the injection channel, even if a flow regulating valve communicated with the injection channel is blocked or cannot be opened, the high-pressure hydrogen can still be provided for the nozzle through the bypass channel in the injector, and the high-pressure hydrogen is mixed with the backflow hydrogen entering from the secondary inlet and then is supplied to the electric pile as a gas source, so that the fuel cell system can at least provide idle power for a vehicle, the vehicle can move from a fault point to a maintenance place, and the reliability of the vehicle is improved.

The ejector provided by the application has at least the following advantages:

(1) The ejector is provided with the bypass passage, so that the fuel cell system can at least provide power above idle speed under the condition that the flow regulating valve is blocked or can not be opened, the vehicle can be ensured to move to a maintenance place, and the reliability of the vehicle is improved.

(2) The ejector provided by the application can also delay the delay of the flow regulating valve and reduce the pressure fluctuation; on the premise of limited flow of the flow regulating valve, the hydrogen supply capacity of the ejector is increased to match with a system with larger power; the ejector provided by the application can provide a larger range of hydrogen flow for the galvanic pile.

Drawings

FIG. 1 shows a schematic diagram of an ejector in one or more embodiments of the application.

Fig. 2 shows a schematic structural view of the body in the ejector of fig. 1.

Fig. 3 shows a partial enlarged view of the body at D in fig. 2.

Fig. 4 shows a schematic view of the nozzle in the ejector of fig. 1.

Fig. 5 shows a schematic view of the nozzle in the ejector of fig. 1.

Fig. 6 shows a schematic structural view of the flow regulating valve in the ejector of fig. 1.

Fig. 7 shows a schematic view of the flow regulating valve in the eductor of fig. 1.

Reference numerals illustrate:

100-body, 110-injection channel, 111-first channel section, 112-second channel section, 112 a-nozzle mounting section, 112 b-mixing section, 112 c-diffuser section, 112 d-outlet section, 113-connection, 114-primary inflow inlet, 115-secondary inflow inlet, 116-air outlet, 117-second limiting surface, 120-bypass channel, 121-first bypass section, 122-second bypass section, 130-first mounting port, 140-second mounting port, 150-guiding surface, 160-mounting hole, 161-first limiting surface.

200-Nozzle, 210-mounting section, 211-communication hole, 212-communication groove, 213-inner step surface, 214-middle step surface, 215-outer step surface, 216-large shaft section, 217-small shaft section, 220-spraying section, 230-spraying channel.

300-Flow regulating valve, 310-valve body, 311-valve cavity, 312-valve hole, 313-convex ring, 320-valve core, 321-valve core body, 322-sealing gasket, 330-valve rod, 340-operation section, 350-outer mounting section, 360-air guiding section, 370-output end, 371-first step surface, 372-second step surface, 373-third step surface, 380-return spring, 390-coil.

410-Sealing ring, 420-outer seal, 430-inner seal, 440-rubber sealing ring.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

According to the embodiment of the first aspect of the application, the ejector can be used for ejecting air in the air from fuel gas, can be applied to an auxiliary power device of an aircraft, can also be used for ejecting backflow hydrogen from high-pressure hydrogen, and can be applied to a fuel cell system of a vehicle. When the ejector is used for the fuel cell system, even if the flow regulating valve is blocked or cannot be opened, the ejector can continuously provide high-pressure hydrogen to eject and reflux hydrogen through the bypass channel so as to provide a hydrogen source for the fuel cell, at least provide power above idling for a vehicle, ensure that the vehicle can move to a maintenance place, and improve the reliability of the vehicle.

The ejector of the present application will be further described below by taking the application of the ejector to a fuel cell system as an example.

Fig. 1 is a schematic structural diagram of an ejector according to one or more embodiments of the present application, referring to fig. 1, the ejector provided in the embodiment of the present application includes a body 100 and a nozzle 200, where the body 100 is provided with an ejection channel 110 and a bypass channel 120; the nozzle 200 is disposed in the injection passage 110, the injection passage 230 of the nozzle 200 communicates with the injection passage 110, and the nozzle 200 is provided with a communication hole 211, the communication hole 211 being located upstream of the secondary flow inlet 115 of the injection passage 110, the injection passage 230 communicating with the outlet of the bypass passage 120 through the communication hole 211.

Referring to fig. 2, the body 100 of the injector provides a mounting structure for the nozzle 200 and provides an injection channel 110 and a bypass channel 120 for flowing hydrogen, wherein the injection channel 110 has a primary inflow port 114, a secondary inflow port 116, and the primary inflow port 114, the secondary inflow port 116 are sequentially disposed along the flowing direction of the medium in the injection channel 110, the primary inflow port 114 is a high-pressure hydrogen inflow port, the secondary inflow port 115 is a hydrogen inflow port of the fuel cell system for flowing back hydrogen, and the high-pressure hydrogen at the air outlet 116 is a hydrogen outflow port after injecting the flowing back hydrogen. The bypass passage 120 may be in communication with an external high pressure hydrogen source such that high pressure hydrogen enters the bypass passage 120.

Referring to fig. 1, the nozzle 200 is a core component of the ejector, and since the bypass passage 120 is communicated with the injection passage 230 of the nozzle 200 through the communication hole 211, the nozzle 200 can introduce high-pressure hydrogen gas, which enters through the bypass passage 120, into the mixing section 112b of the injection passage 110. The nozzle 200 is installed in the injection passage 110, so that the nozzle 200 can also introduce the high-pressure hydrogen gas, which is introduced from the primary inflow port 114, into the mixing section 112b of the injection passage 110. Thus, the nozzle 200 may introduce both the high pressure hydrogen gas entering the primary flow inlet 114 and the high pressure hydrogen gas entering the bypass passage 120 into the mixing section 112b.

With continued reference to fig. 1, since the communication hole 211 is located upstream of the secondary inlet 115 of the injection channel 110, that is, the outlet of the bypass channel 120 is located upstream of the secondary inlet 115, and the high-pressure gas in the bypass channel 120 is derived from the outside and does not depend on the high-pressure hydrogen in the injection channel 110, even if the flow regulating valve 300 (also referred to as a proportional valve, the flow regulating valve 300 may be independent of the body 100 and communicated with the primary inlet 114, the flow regulating valve 300 may be integrated in the injection channel 110 of the body 100 and installed upstream of the nozzle 200) is stuck or unable to be opened, the high-pressure hydrogen may still be provided to the nozzle 200 through the bypass channel 120, and mixed with the backflow hydrogen entering the secondary inlet 115 and then supplied to the electric pile as a gas source, so that the fuel cell system may at least provide the idling power of the vehicle, ensure that the vehicle may move to a maintenance site, and improve the reliability of the vehicle.

In some embodiments, referring to fig. 5, the nozzle 200 includes a mounting section 210 and a spraying section 220 disposed in sequence in an axial direction, the mounting section 210 having a larger cross-sectional size than the spraying section 220, and the communication hole 211 is provided in the mounting section 210. The cross-sectional dimension of the mounting section 210 is large, so that the mounting section 210 can be mounted on the injection channel 110, and the mounting section 210 is attached to the inner wall of the injection channel 110, so that the communication hole 211 can be directly formed in the nozzle 200 without arranging other pipeline structures, and the injection channel 230 of the nozzle 200 is communicated with the bypass channel 120 on the body 100 through the communication hole 211. The installation section 210 is located at the upstream of the secondary inlet 115, the injection section 220 corresponds to the secondary inlet 115 of the injection channel 110, the injection section 220 is arranged in the injection channel 110 in a gap, and a space between the injection section 220 and the inner wall of the injection channel 110 provides an accommodating space for the backflow hydrogen introduced by the secondary inlet 115.

With continued reference to FIG. 5, in some embodiments, the mounting section 210 is stepped with the spray section 220. In other embodiments, the cross-sectional dimensions of the spray segment 220 decrease in sequence along the direction of media flow, i.e., the spray segment 220 may have a tapered profile that reduces the machining stresses associated with the machining of the nozzle 200.

Since the nozzle 200 needs to be installed in the injection passage 110, in order to ensure that the injection passage 110 and the communication hole 211 can be quickly communicated when the nozzle 200 is installed, in some embodiments, referring to fig. 1 and 5, the installation section 210 is provided with a communication groove 212 extending along the circumferential direction of the nozzle 200, and the communication groove 212 is communicated with both the bypass passage 120 and the communication hole 211.

The communication groove 212, the communication hole 211, and the injection passage 230 of the nozzle 200 may be obtained at the time of machining the nozzle 200, and the machining order of each structure may be the injection passage 230, the communication groove 212, and the communication hole 211 in this order, or may be the communication groove 212, the communication hole 211, and the injection passage 230. Since the communication groove 212 extends along the circumferential direction of the nozzle 200, that is, the extending direction of the communication groove 212 is perpendicular to the axis of the nozzle 200, the circumferential dimension of the communication groove 212 along the nozzle 200 is far greater than the outlet aperture of the bypass channel 120, so that the nozzle 200 only needs to be rotated around the axis of the nozzle 200 itself during installation, and any position of the communication groove 212 of the nozzle 200 is communicated with the outlet of the bypass channel 120, and the installation operation of the nozzle 200 is simple and easy.

In some embodiments, the length of the communication slot 212 may be one third of a turn around the nozzle 200, one half of a turn around the nozzle 200, two thirds of a turn around the nozzle 200, or the entire turn around the nozzle 200, etc. In some embodiments, the length of the communication slot 212 may be the full circle of the nozzle 200, that is, the communication slot 212 is a ring groove, and the bypass channel 120 and the ring groove can be communicated without rotation by only inserting the nozzle 200 into the injection channel 110 during installation.

In some embodiments, the dimension of the communication groove 212 in the axial direction of the nozzle 200 may be the same as the aperture of the communication hole 211. In other embodiments, the size of the communication groove 212 in the axial direction of the nozzle 200 is larger than the aperture of the communication hole 211, so that the communication groove 212 and the communication hole 211 of the nozzle 200 are easily processed, and the strength of the nozzle 200 is not greatly affected. In other embodiments, the size of the communication groove 212 in the axial direction of the nozzle 200 is smaller than the aperture of the communication hole 211, facilitating the introduction of high-pressure hydrogen gas from the bypass passage 120 into the injection passage 230 of the nozzle 200.

In certain embodiments, referring to FIG. 1, the size of the annular groove is not less than the aperture of the outlet of the bypass passage 120, i.e., the width of the annular groove is greater than or equal to the aperture of the outlet of the bypass passage 120, along the axial direction of the nozzle 200. That is, in some embodiments, the width of the ring groove is equal to the aperture of the outlet of the bypass channel 120. In other embodiments, the width of the annular groove is greater than the aperture of the outlet of the bypass channel 120, and it is easier to ensure that the bypass channel 120 is in aligned communication with the annular groove in the axial direction of the nozzle 200 when the nozzle 200 is installed. In some embodiments, the width of the ring groove is between 1.1 and 3 times the aperture of the outlet of the bypass channel 120, e.g., the width of the ring groove is 1.2 times, 1.5 times, 2 times, 2.3 times, 2.7 times, etc. the aperture of the outlet. Too large a width of the ring groove may reduce the strength of the mounting section 210 of the nozzle 200 to some extent, and too small a width of the ring groove, such as 0.6-0.9 times the outlet diameter, such as 0.7 times, 0.8 times, or 0.9 times the outlet diameter, may increase the difficulty of mounting the nozzle 200 to the injection passage 110 to some extent.

In some embodiments, referring to fig. 1 and 6, the ejector further includes a flow regulating valve 300 disposed between the primary inlet 114 and the secondary inlet 115 of the ejector channel 110, and the nozzle 200 is close to the output end 370 of the flow regulating valve 300, that is, the flow regulating valve 300 and the nozzle 200 are integrated in the body 100 of the ejector, so that the ejector has high integration and small occupied space. In other embodiments, the flow regulating valve 300 communicates with the primary flow inlet 114 of the eductor.

In some embodiments, when the flow control valve 300 and the nozzle 200 are both integrated in the body 100 of the ejector, the bypass channel 120 is connected in parallel with the ejector channel 110, and the inlet of the bypass channel 120 is located upstream of the output end 370 of the flow control valve 300 and is connected to the ejector channel 110, the bypass channel 120 uses the same high-pressure hydrogen source as the ejector channel 110, i.e. the high-pressure hydrogen entering from the primary inlet 114 of the ejector channel 110, one of which sequentially passes through the flow control valve 300 and the nozzle 200 to reach the mixing section 112b, and the other of which sequentially passes through the bypass channel and the nozzle 200 to reach the mixing section 112b. It should be noted herein that the output end 370 of the flow regulating valve 300 is the end that is configured to regulate the flow and output the high-pressure hydrogen, and in some embodiments, the inlet of the bypass passage 120 may be connected upstream of the flow regulating valve 300.

In some embodiments, referring to FIG. 3, the inner wall of the injection passage 110 is provided with a guide surface 150, the inlet of the bypass passage 120 is located on the guide surface 150, and the guide surface 150 is provided to facilitate processing of the bypass passage 120. In other embodiments, the guide surface 150 may also be used as a guide structure for installing the valve body 310 of the flow control valve 300 in the injection channel 110, so as to improve the installation efficiency and accuracy of the valve body 310.

In some embodiments, referring to fig. 2, the injection channel 110 includes a first channel section 111 and a second channel section 112 that are disposed at an angle, the body 100 is provided with a mounting hole 160, the mounting hole 160 corresponds to the position of the connection 113 of the first channel section 111 and the second channel section 112, the valve body 310 of the flow regulating valve 300 is mounted in the mounting hole 160, the output end 370 extends into the second channel section 112, and the nozzle 200 is located in the second channel section 112. The first channel section 111 and the second channel section 112 are arranged at an angle, so that the body 100 of the ejector can be in a block shape, such as a cuboid, a cylinder and the like, and the size of the ejector in a certain direction (such as along the extending direction of the ejector channel 110) is reduced, so that the ejector is suitable for the installation requirement of a small space on a vehicle. The positions of the communicating parts 113 of the first channel section 111 and the second channel section 112 correspond to the positions of the mounting holes 160, so that the processing amount of the internal channel of the ejector body 100 can be reduced, and the processing efficiency of the ejector body 100 can be improved. When the valve body 310 of the flow regulating valve 300 is mounted in the mounting hole 160, the position of the flow regulating valve 300 corresponds to the position of the communicating position 113 of the first channel section 111 and the second channel section 112, so that the integration level of the ejector is further improved, and the structure is more compact.

In certain embodiments, the first channel segment 111 and the second channel segment 112 may have an included angle of 65 ° to 95 °, e.g., the first channel segment 111 and the second channel segment 112 may have an included angle of 70 °, 75 °, 80 °, 85 °, or 90 °, etc.

In some embodiments, the body 100 is cylindrical, the injection channel 110 further includes a third channel segment connected to the second channel segment 112, the third channel segment is disposed at an angle to the second channel segment 112, the first channel segment 111 and the third channel segment are parallel to the axial direction of the cylindrical body 100, the second channel segment 112 is perpendicular to the axial direction of the cylindrical body 100, the mounting hole 160 corresponds to the connection 113 of the second channel and the third channel segment in position, the valve body 310 of the flow regulating valve 300 is mounted in the mounting hole 160, the output end 370 extends into the second channel segment 112, and the nozzle 200 is located in the third channel segment.

In some embodiments, referring to fig. 1, the output end 370 of the flow control valve 300 is coaxially disposed with the nozzle 200, that is, the output end 370 of the valve body 310, the nozzle 200 and the second channel section 112 are all coaxial, so that when high-pressure hydrogen passes through the flow control valve 300 and the nozzle 200, the pressure loss is low, and the injection effect of the hydrogen is ensured.

To achieve a coaxial arrangement of the output end 370 of the flow regulator valve 300 with the nozzle 200, in some embodiments, the nozzle 200 mates with the output end 370 of the valve body 310 via a stepped shaft and stepped bore structure. That is, in some embodiments, the nozzle 200 is a stepped shaft structure, the output end 370 of the valve body 310 is a stepped bore structure, and the stepped shaft structure of the nozzle 200 mates with the stepped bore structure of the output end 370. In other embodiments, referring to fig. 1, the nozzle 200 has a stepped hole structure, the output end 370 of the flow rate adjusting valve 300 has a stepped shaft structure, and the stepped hole structure of the nozzle 200 is matched with the stepped shaft structure of the output end 370.

In some embodiments, the middle of the output end 370 of the valve body 310 abuts against the nozzle 200, that is, the surface between the output end 370 and the nozzle 200 abuts against each other, and the abutting surfaces are perpendicular to the axis of the nozzle 200 and the output end 370, so that the coaxiality of the output end 370 and the nozzle 200 is ensured, and the sealing effect between the flow regulating valve 300 and the nozzle 200 is improved.

In some embodiments, referring to fig. 1 and fig. 7, the output end 370 of the flow control valve 300, that is, the output end 370 of the valve body 310, has a two-stage stepped shaft structure, which has a first stepped surface 371, a second stepped surface 372 and a third stepped surface 373 sequentially disposed along a central axis to an outer peripheral surface thereof, and referring to fig. 1 and fig. 4, the nozzle 200 has a two-stage stepped hole structure, which has an inner stepped surface 213, a middle stepped surface 214 and an outer stepped surface 215 sequentially disposed along a central axis to an outer peripheral surface thereof, and since the first stepped surface 371 of the output end 370 is perpendicular to the axis of the output end 370, the inner stepped surface 213 of the nozzle 200 is perpendicular to the axis of the nozzle 200, and the middle of the output end 370 is in abutment with the nozzle 200, that is, the first stepped surface 371 of the output end 370 is in abutment with the inner stepped surface 213 of the nozzle 200, so that the output end 370 of the flow control valve 300 is coaxially disposed with the nozzle 200. In some embodiments, the output 370 may be a primary stepped shaft configuration and the nozzle 200 a primary stepped bore configuration. In other embodiments, the output 370 may also be a three-stage stepped shaft configuration and the nozzle 200 may be a three-stage stepped bore configuration.

In some embodiments, referring to fig. 1, a sealing ring 410 is disposed between the output end 370 and the nozzle 200, and the sealing ring 410 surrounds the middle of the output end 370 in a compressed state to improve the sealing effect between the flow regulating valve 300 and the nozzle 200 and prevent the high-pressure hydrogen from leaking. The seal ring 410 may be a rubber ring or a silicone ring, etc. In some embodiments, when the output end 370 is a two-stage stepped shaft structure and the nozzle 200 is a two-stage stepped bore structure, referring to fig. 1, the sealing ring 410 is pressed between the second stepped surface 372 of the valve body 310 and the middle stepped surface 214 of the nozzle 200.

In some embodiments, the output end 370 is a stepped shaft structure, the nozzle 200 is a stepped hole structure, the small shaft of the output end 370 is in clearance fit with the nozzle 200, the distance between the inner stepped surface 213 and the middle stepped surface 214 is H1, the axial dimension of the compressed sealing ring 410 is H2, and the axial length of the small shaft of the output end 370 is H3, h3=h1+h2, so as to ensure that the output end 370 is fully embedded into the stepped hole of the nozzle 200.

In some embodiments, the edge of the output 370 is disposed in a gap with the end face of the nozzle 200 to ensure that the seal ring 410 is in compression and that there is good sealing between the nozzle 200 and the valve body 310. In some embodiments, referring to fig. 1, when the output end 370 is a two-stage stepped shaft structure and the nozzle 200 is a two-stage stepped bore structure, the third stepped surface 373 of the valve body 310 is disposed in a gap with the outer stepped surface 215 of the nozzle 200.

As a structure for adjusting the flow rate of the high-pressure hydrogen flowing through the injection channel 110, referring to fig. 6, in some embodiments, the valve body 310 of the flow rate adjusting valve 300 includes an operation section 340, an outer mounting section 350, an air guiding section 360, an inner mounting section (not labeled), and the output end 370 sequentially disposed along the axial direction of the output end 370 thereof.

Wherein, the operation section 340 is located outside the body 100, so that an operator can act on the operation section 340 to install the flow control valve 300 on the body 100 of the injector. The cross-sectional size of the operation section 340 is larger than the aperture of the mounting hole 160, so that the end surface of the operation section 340 abuts against the hole edge of the mounting hole 160 of the body 100 to limit, and meanwhile, the cross-sectional size of the operation section 340 is large, so that the mounting adjustment is facilitated.

The outer mounting section 350 is positioned within the mounting hole 160. In some embodiments, the outer mounting section 350 is in clearance fit with the wall of the mounting hole 160 to facilitate installation. In order to improve the sealing performance between the outer mounting section 350 and the mounting hole 160, in some embodiments, referring to fig. 1, an outer sealing member 420 is disposed between the outer mounting section 350 and the wall of the mounting hole 160, so as to ensure the sealing effect between the outer mounting section 350 and the mounting hole 160, and avoid the problem of hydrogen leakage. To improve the mounting stability of the outer seal 420, in some embodiments, the outer mounting section 350 is provided with an outer mounting groove into which the outer seal 420 is partially embedded, and the outer peripheral surface of the outer seal 420 protrudes from the outer mounting groove to press against the wall of the mounting hole 160.

The gas guide section 360 may guide the high pressure hydrogen gas entering from the primary inflow port 114 to the output port 370 on the one hand and to the inlet of the bypass passage 120 on the other hand. The air guide section 360 corresponds to the first channel section 111 in position, and is provided with a valve cavity 311 for the valve core 320 to move and an air guide hole communicated with the valve cavity 311, the communication position 113 of the first channel section 111 and the second channel section 112 is arranged with the air guide section 360 in a clearance way, the bypass channel 120 and the primary inflow port 114 are respectively positioned at two sides of the valve body 310 along the extending direction of the first channel section 111, so that high-pressure hydrogen entering through the primary inflow port 114 flows in the first channel section 111, one path enters into the valve cavity 311 through the air guide hole of the air guide section 360 of the valve body 310, then moves into the injection channel 230 of the nozzle 200 through the valve cavity 311, the other path of high-pressure hydrogen flows from the clearance between the valve body 310 and the communication position 113 to the inlet of the bypass channel 120, and then moves into the injection channel 230 of the nozzle 200 through the bypass channel 120.

The air guide holes of the air guide section 360 may be provided with a plurality of air guide holes, and the plurality of air guide holes are arranged at intervals along the circumferential direction of the air guide section 360, so that the efficiency of high-pressure hydrogen in the first channel section 111 entering the valve cavity 311 is improved. In some embodiments, the gas vent is provided with three, four, six, or the like.

In some embodiments, the guide surface 150 corresponds to the position of the air guide section 360, and the guide surface 150 is beveled toward the mounting hole 160, thereby guiding the inner mounting section into the second channel section 112. The stepped arrangement of the second channel section 112 here, however, provides a machined surface for the inlet of the bypass channel 120, and after machining of the second channel section 112 has been completed, the bypass channel 120 can continue to be machined at the guide surface 150.

The inner mounting section is mounted in the second channel section 112, the inner mounting section is attached to the inner wall of the second channel section 112, and an inner sealing member 430 in a compressed state is arranged between the inner mounting section and the inner wall of the second channel section 112. In some embodiments, to improve the mounting stability of the inner seal 430, the inner mounting section is provided with an inner seal groove surrounding the peripheral surface of the valve body 310, the inner seal 430 is embedded in the inner seal groove, and the outer periphery of the inner seal 430 extends out of the inner seal groove to abut against the inner wall of the second channel section 112 in a compressed state. In some embodiments, the second channel segment 112 may be disposed in a gap with the inner mounting segment to facilitate installation, and in other embodiments, the second channel segment 112 is in an interference fit with the inner mounting segment, and the inner seal 430 is positioned between the inner seal segment and the inner wall of the second channel segment 112 in a compressed state, wherein the inner seal 430 may be an inner seal ring 410.

The output end 370 has a valve hole 312 communicated with the valve cavity 311 and the injection passage 230 of the nozzle 200, the aperture of the valve hole 312 is smaller than the valve cavity 311, and the valve core 320 of the flow rate adjusting valve 300 is movably disposed in the valve cavity 311 to adjust the opening of the communication position between the valve cavity 311 and the valve hole 312 and adjust the flow rate of the high-pressure hydrogen gas entering the valve hole 312 through the valve cavity 311. In some embodiments, the valve aperture 312 is the same as the aperture of the injection passage 110, or the aperture of the valve aperture 312 is larger than the aperture of the injection passage 110. In some embodiments, the valve cavity 311 may be a cylindrical cavity or a conical cavity, the position of the valve cavity 311 acting on the valve core 320 corresponds to the position of the inner mounting section, the valve hole 312 corresponds to the position of the output end 370, the valve cavity 311 and the valve hole 312 have a stepped hole structure, and can be matched with the stepped shaft structure of the output end 370, so that the strength of the valve body 310 is ensured, and the valve body 310 of the flow regulating valve 300 and the nozzle 200 are coaxially arranged, so as to reduce the pressure loss of high-pressure hydrogen.

In some embodiments, the cross-sectional areas of the operating section 340, the outer mounting section 350, the air guiding section 360 and the output end 370 of the valve body 310 are sequentially reduced, and the aperture of the mounting hole 160 of the body 100 is larger than that of the second channel section 112, so that the air guiding section 360 can be arranged in the communicating position 113 of the first communicating section and the second communicating section in a clearance manner, the guiding surface 150 is located at a position of the second channel section 112 close to the communicating position 113, and the guiding surface 150 is arranged to facilitate processing of the bypass channel 120 on the body 100 and also serves as a guiding structure when the valve body 310 of the flow regulating valve 300 is mounted, so that the mounting efficiency of the valve body 310 of the flow regulating valve 300 is improved. In some embodiments, the operating section 340, the outer mounting section 350, and the air guide section 360 are multi-stage stepped shaft structures, and in other embodiments, the cross-sectional areas of the operating section 340, the outer mounting section 350, and the air guide section 360 may be gradually reduced, such as tapered.

In some embodiments, the distance between the end surface of the operation section 340 of the valve body 310 and the first stepped surface 371 of the output end 370 of the valve body 310 is L1, the surface of the hole edge of the mounting hole 160 of the body 100 for abutting against the end surface of the operation section 340 is the first limiting surface 161, the limiting surface of the body 100 for limiting the shoulder of the nozzle 200 is the second limiting surface 117, the distance between the first limiting surface 161 of the body 100 and the second limiting surface 117 is L2, and the distance between the shoulder of the nozzle 200 and the inner stepped surface 213 is L3, wherein 0 is less than or equal to l2+l3—l1 is less than or equal to 0.04mm, so as to adjust the manufacturing error of the length of the valve core 320 of the flow regulating valve 300 by using the compression ratio of the sealing ring 410.

In some embodiments, the flow regulating valve 300 further has a valve stem 330, the valve stem 330 is telescopically coupled within the operating section 340 along the axial direction of the output end 370, the end of the valve stem 330 is coupled to the valve spool 320, the valve stem 330 is telescopically coupled along the axial direction of the output end 370 such that the valve spool 320 is axially telescopic within the valve cavity 311 along the valve bore 312 such that the valve spool 320 is either proximate to or distal from the valve bore 312, thereby effecting an open adjustment of the communication position of the valve cavity 311 with the valve bore 312.

In some embodiments, the valve rod 330 is an armature rod, the operating section 340 is provided with a mounting cavity, the outer mounting section 350 is provided with an extending hole which is communicated with the mounting cavity and the valve cavity 311 and is used for the valve rod 330 to extend into, a coil 390 positioned in the mounting cavity is arranged in the valve body 310, the coil 390 is wound outside the valve rod 330, the flow regulating valve 300 further comprises a reset spring 380 connected to the valve rod 330, the reset spring 380 is positioned in the mounting cavity and is abutted to the cavity wall of the mounting cavity, and the reset spring 380 and the valve rod 330 are coaxially arranged.

When the coil 390 is powered off and the flow regulating valve 300 is closed, the valve core 320 is abutted against the valve hole 312, and the return spring 380 is in a return state; after the coil 390 is energized, the valve stem 330 receives electromagnetic force in the axial direction of the nozzle 200, the return spring 380 is compressed, and the valve cartridge 320 is moved away from the valve hole 312. By adjusting the current level of the coil 390, the distance between the valve element 320 and the valve hole 312 can be adjusted to adjust the opening degree. The electromagnetic flow regulating valve is in the prior art, and more contents of the electromagnetic flow regulating valve can be disclosed by referring to the prior art and are not repeated.

In some embodiments, the valve core 320 of the flow regulating valve 300 is movably disposed in the valve cavity 311 of the valve body 310, the valve core 320 includes a valve core body 321 and a sealing pad 322 connected to the valve core body 321, the valve core body 321 is connected to the valve stem 330, and the sealing pad 322 may be a rubber sealing pad 322 or a silica gel sealing pad 322; the valve body 310 of the flow rate regulating valve 300 is provided with a convex ring 313 for acting on the packing 322 to improve the sealing effect of the flow rate regulating valve 300. Wherein, the convex ring 313 may be formed by machining the valve body 310, the convex ring 313 is coaxial with the output end 370 of the flow regulating valve 300 and is located in the valve chamber 311.

In some embodiments, the valve body 321 is provided with a recess, the sealing pad 322 is embedded in the recess, the sealing pad 322 abuts against or leaves the convex ring 313, and the opening of the flow regulating valve 300 is adjusted to regulate the flow of high-pressure hydrogen. In other embodiments, the portion of the gasket 322 that extends out of the recess for abutment with the collar 313. The valve core body 321 can be made of metal blocks, such as steel blocks, and has high strength. The valve core 320 structure adopting the valve core body 321 and the sealing gasket 322 is convenient for only replacing the sealing gasket 322 after the sealing gasket 322 fails, and the installation structure of the sealing gasket 322 does not need to be replaced, so that the maintenance of the flow control valve 300 is more convenient.

In some embodiments, the valve body 321 may be the same shape as the valve cavity 311, or may be different from the valve body 320. In some embodiments, the valve cavity 311 is cylindrical and the valve core body 321 is cylindrical. In other embodiments, the valve cavity 311 is rectangular parallelepiped and the spool body 321 is spherical.

To achieve a coaxial arrangement of the nozzle 200 with the second channel segment 112, in certain embodiments, the nozzle 200 is interference or transition fit with the injection channel 110, i.e., the nozzle 200 is interference or transition fit with the second channel segment 112. In some embodiments, the nozzle 200 and the second channel segment 112 may be positioned with H8/f7 precision for hole axis mating, e.g., H8 in φ 100H8/f7 represents the tolerance band number of the second channel segment 112, f7 represents the tolerance band number of the nozzle 200, and H8/f7 represents the mating number of the second channel segment 112 and the nozzle 200 for holes and axes having a diameter of 100 mm. By querying the standard tolerance value table, the maximum tolerance of the second channel segment 112 of phi 100H8/f7 is 0.054mm, the maximum tolerance of the nozzle 200 is 0.035mm, and the maximum mating tolerance of the nozzle 200 with the second channel segment 112 is 0.089mm.

In some embodiments, the nozzle 200 is of a stepped shaft structure, i.e., the mounting section 210 of the nozzle 200 is of a stepped shaft structure, the shoulder of the nozzle 200 abuts against the injection channel 110, i.e., the shoulder of the nozzle 200 abuts against the second channel section 112, the nozzle 200 is matched with the structure of the second channel section 112, so that the nozzle 200 is mounted in place, and the second channel section 112 is coaxial with the nozzle 200.

In the installation section 210 of the stepped shaft structure, the large shaft section 216 is disposed in a gap with the second channel section 112, in some embodiments, the communication groove 212 is located in the small shaft section 217 of the installation section 210, the small shaft section 217 is in interference fit or transition fit with the second channel section 112, the sealing effect between the small shaft section 217 and the second channel section 112 is good, the outlet of the bypass channel 120 corresponds to the position of the small shaft section 217, and the risk of high-pressure hydrogen leakage of the bypass channel 120 is reduced. In other embodiments, a rubber seal ring 440 is provided between the small shaft section 217 of the mounting section 210 and the second channel section 112, the rubber seal ring 440 being located on a side of the communication hole 211 remote from the flow regulating valve 300.

In some embodiments, the bypass passage 120 includes a first bypass segment 121 and a second bypass segment 122, the first bypass segment 121 and the second bypass segment 122 being disposed at an angle and in communication with each other, the first bypass segment 121 being in communication with the communication 113 of the first passage segment 111 and the second passage segment 112, the second passage segment 112 being in communication with the injection passage 230 of the nozzle 200 to facilitate processing of the first bypass segment 121 and the second bypass segment 122. In other embodiments, the first bypass segment 121 and the second bypass segment 122 are perpendicular to each other, the first bypass segment 121 is parallel to the axial direction of the nozzle 200, and the second bypass segment 122 is perpendicular to the axial direction of the nozzle 200. The aperture of the bypass passage 120 may be determined based on the consumption of idle power of the vehicle and the pressure calculation of the high-pressure hydrogen gas.

When the bypass passage 120 is machined, the first bypass section 121 may be machined at the guide surface 150, a machining groove may be formed at the outer side of the position of the body 100 corresponding to the second passage section 112, and then the second bypass section 122 may be machined through the machining groove. When the ejector works, the processing groove is plugged by the sealing plug, so that the leakage of high-pressure hydrogen is avoided.

In some embodiments, the eductor further comprises an on-off valve for opening and closing the primary inflow port 114 of the eductor passageway 110, the opening and closing of the primary inflow port 114 being accomplished by the on-off valve for introducing high pressure hydrogen gas or stopping introducing high pressure hydrogen gas. The opening/closing valve is an electrically controlled valve, and can automatically control the opening/closing of the primary inflow port 114, thereby achieving a high degree of automation. The opening and closing valve can be an electromagnetic valve, the electromagnetic valve belongs to the prior art, more contents can be disclosed by referring to the prior art, and the application is not repeated.

In some embodiments, the on-off valve is mounted at a communication portion between the primary inflow port 114 and the first channel section 111, the first channel section 111 includes a thick section and a thin section, the thick section and the thin section are communicated, the on-off valve at least partially extends into the thick section, the thin section corresponds to a position of the air guide section 360 of the flow regulating valve 300, and the thin section is communicated with an air guide hole of the air guide section 360.

In some embodiments, the ejector further comprises a pressure sensor for detecting the pressure of the medium at the air outlet 116 of the ejector channel 110, and since the pressure of the hydrogen at the air outlet 116 is lower than the pressure of the high-pressure hydrogen at the primary inlet 114, the pressure sensor is a low-pressure sensor, the body 100 is provided with a first mounting port 130 for mounting the low-pressure sensor, and the first mounting port 130 is communicated with one side of the second channel segment 112 close to the air outlet 116.

In some embodiments, the ejector further comprises a pressure sensor for detecting the high-pressure hydrogen pressure in the first channel section 111, and since the hydrogen in the first channel section 111 is high-pressure hydrogen, the pressure sensor is a high-pressure sensor, the body 100 is provided with a second mounting port 140 for mounting the high-pressure sensor, and the second mounting port 140 is communicated with the thick section of the first channel section 111.

By arranging the low-pressure sensor and the high-pressure sensor, the gas pressure of the high-pressure hydrogen at the gas outlet 116 of the injection channel 110 and in the first channel section 111 can be detected respectively, and the error abnormality can be monitored and judged in real time.

In some embodiments, the eductor includes both a high pressure sensor and a low pressure sensor, where the high pressure sensor is proximate to the output end 370 of the on-off valve.

In some embodiments, the second channel segment 112 includes a nozzle mounting segment 112a, a mixing segment 112b, a diffuser segment 112c and an outlet segment 112d sequentially disposed, the nozzle 200 is mounted on the nozzle mounting segment 112a, the mixing segment 112b can flow both high-pressure hydrogen ejected from the ejection channel 230 of the nozzle 200 and backflow hydrogen entering from the secondary inlet 115 into the mixing segment 112b for mixing, the high-pressure hydrogen is mixed with energy of the backflow hydrogen, the cross-sectional size of the mixing segment 112b is smaller than that of the nozzle mounting segment 112a, the cross-sectional sizes of the diffuser segment 112c, the mixing segment 112b and the outlet segment 112d are sequentially increased, i.e. the cross-sectional size of the mixing segment 112b is larger than that of the diffuser segment 112c, the cross-sectional size of the outlet segment 112d is larger than that of the diffuser segment 112c, and the position of the low-pressure sensor corresponds to the position of the outlet segment 112 d.

In some embodiments, the body 100 may be rectangular parallelepiped in shape, and the valve body 310 of the flow rate adjustment valve 300 and the valve body 310 of the opening/closing valve extend from two adjacent faces of the rectangular parallelepiped body 100, and in other embodiments, the valve body 310 of the flow rate adjustment valve 300 and the valve body 310 of the opening/closing valve are located on the same face of the rectangular parallelepiped body 100. In some embodiments, the body 100 may be L-shaped, where the body 100 includes a first section and a second section, the first section and the second section are connected and disposed at an angle, the first channel section 111 is located in the first section, the second channel section 112 is located in the second section, the flow control valve 300 is installed at a connection between the first section and the second section, the valve body 310 of the on-off valve is located in the first section, the primary inflow port 114 is perpendicular to the first channel section 111, and the secondary inflow port 115 is perpendicular to the second channel section 112.

In some embodiments, the body 100 is provided with a plurality of connection locations through which the body 100 may be mounted to the vehicle body when the injector is applied to a fuel cell system. In some embodiments, a plurality of connection locations are spaced apart to improve connection stability of the injector to the vehicle body. In some embodiments, four connection locations are provided, two of which are located in the first section and two of which are located in the second section, and after installation, the on-off valve is located above, the first channel section 111 is disposed vertically, and the output 370 of the flow regulating valve 300, the nozzle 200, and the second channel section 112 are disposed horizontally.

Taking the ejector applied to a fuel cell system as an example, the working process of the ejector provided by the application is as follows:

When the vehicle is idling (the flow rate regulating valve 300 is closed) or the flow rate regulating valve 300 fails and cannot be opened, the opening and closing valve is opened, high-pressure hydrogen gas sequentially enters the first channel section 111 through the opening and closing valve, high-pressure hydrogen gas cannot enter the injection channel 230 of the nozzle 200 through the flow rate regulating valve 300 because the flow rate regulating valve 300 is in a closed state, high-pressure hydrogen gas enters the bypass channel 120 from a gap between the valve body 310 of the flow rate regulating valve 300 and the communication part 113, then enters the injection channel 230 of the nozzle 200 along the communication groove 212 and the communication hole 211 of the nozzle 200, and backflow hydrogen gas (low pressure) entering from the secondary inlet 115 is mixed with high-pressure hydrogen gas sprayed out of the injection channel 230 of the nozzle 200 in the mixing section 112b of the second channel section 112 and sequentially discharged along the diffusion section 112c and the outlet section 112d, and is sent to a fuel cell stack, so that the vehicle idling required gas is increased.

When the vehicle power demand is greater than the idle power demand, the on-off valve and the flow regulating valve 300 are opened, and the high-pressure hydrogen gas sequentially passes through the on-off valve and enters the first passage section 111, and then is split into two paths of movement, wherein one path of high-pressure hydrogen gas enters the injection passage 230 of the nozzle 200 through the air guide hole, the valve cavity 311 and the valve hole 312 of the flow regulating valve 300. The other high-pressure hydrogen gas enters the bypass passage 120 from the gap between the valve body 310 of the flow rate regulating valve 300 and the communication portion 113, and then enters the injection passage 230 of the nozzle 200 along the communication groove 212 and the communication hole 211 of the nozzle 200, and the two high-pressure hydrogen gases are merged in the injection passage 230 of the nozzle 200. The high-pressure hydrogen gas ejected from the ejection passage 230 of the nozzle 200 is mixed with the high-pressure hydrogen gas (low-pressure) entering from the secondary inlet 115 in the mixing section 112b of the second passage section 112, and is discharged sequentially along the diffuser section 112c and the outlet section 112d to be sent to the stack of the fuel cell, thereby increasing the gas demand for the vehicle to travel.

The ejector provided by the application has at least the following advantages:

(1) The ejector is provided with a bypass passage, the bypass passage can be used as a small-flow air supplementing passage for continuously providing high-pressure hydrogen, so that the fuel cell system can at least provide power above idle speed under the condition that the flow regulating valve 300 is blocked or can not be opened, the vehicle can be ensured to move to a maintenance place, and the reliability of the vehicle is improved.

(2) The ejector provided by the application can also delay the delay of the flow regulating valve 300 and reduce the pressure fluctuation; on the premise that the flow rate of the flow rate regulating valve 300 is limited, the hydrogen supply capacity of the ejector is increased to match a system with larger power; the ejector provided by the application can provide a larger range of hydrogen flow for the galvanic pile.

(3) The nozzle 200 is provided with the communication groove 212, and the outlet of the bypass passage 120 is communicated with the communication hole 211 only by rotating the nozzle 200, so that the installation efficiency of the nozzle 200 on the body 100 is improved.

(4) The width dimension of the communication groove 212 is not smaller than the outlet dimension of the bypass passage 120, so that the communication groove 212 is easily covered on the outlet of the bypass passage 120 during installation to conduct the bypass passage 120 and the communication hole 211, thereby further improving the installation efficiency of the nozzle 200 on the body 100.

(5) The bypass channel 120 is connected with the injection channel 110 in parallel, high-pressure hydrogen in the bypass channel 120 is not influenced by the flow regulating valve 300, and high-pressure hydrogen can be continuously introduced into the nozzle 200, so that the injection effect is ensured.

(6) The ejector integrates the flow regulating valve 300 and the nozzle 200, and the output end 370 of the integrated flow regulating valve 300 is coaxial with the nozzle 200, so that the flow resistance from the valve hole 312 of the flow regulating valve 300 to the nozzle 200 is reduced, the flow rate in the injection channel 230 of the nozzle 200 is high, and the ejection performance of the ejector is good.

(7) The H8/f7 positioning is formed by the nozzle mounting section 112a and the second channel section 112 of the ejector, so that the axis of the nozzle 200 is coaxial with the second channel section 112 of the ejector channel 110, and the ejector ejection effect of the ejector is ensured.

(8) The distance between the operating section 340 of the valve body 310 of the flow rate adjusting valve 300 and the first stepped surface 371, the distance between the first and second stopper surfaces 161 and 213 of the body 100, and the distance between the shoulder of the nozzle 200 and the inner stepped surface 213 are controlled to adjust the manufacturing error of the length of the valve body 320 of the flow rate adjusting valve 300 by the compression ratio of the sealing ring 410.

(9) The nozzle 200 forms two seals (seal ring 410 and rubber seal ring 440) to ensure that high pressure hydrogen completely passes through the nozzle 200 to achieve good injection.

(10) The valve body 310 of the flow regulating valve 300 is sealed by the inner seal 430 and the outer seal 420, preventing leakage of high-pressure hydrogen.

(11) The manufacturing and assembly of the ejector are simple, the hydrogen leakage point is not increased, and the safety is high; the volume is small, and the manufacture and the cleaning are convenient; the application can flexibly select and design the nozzle 200 according to the operation condition of the galvanic pile, avoids the caliber sequence limitation of the proportional valve integrated nozzle 200, and can achieve better injection effect.

In a second aspect, the application provides a fuel cell system comprising an ejector according to any one of the embodiments of the first aspect.

The fuel cell system includes a stack, a hydrogen supply subsystem, an air supply subsystem, and a thermal management subsystem, wherein the eductor is part of the hydrogen supply subsystem.

The hydrogen supply subsystem is used for supplying hydrogen used for anode reaction to the electric pile, and comprises a hydrogen bottle, an ejector and a heater which are sequentially communicated, wherein high-pressure hydrogen in the hydrogen bottle enters from a primary inflow port of the ejector, is mixed with reflux gas exhausted by the electric pile and is exhausted from an air outlet, and is heated by the heater and then is fed into the electric pile.

The air supply subsystem is used for supplying oxygen required by the reaction to the electric pile and comprises an air compressor, an intercooler and a humidifier which are connected in sequence, wherein the air compressed by the air compressor is cooled by the intercooler in sequence, humidified by the humidifier and then enters the electric pile to participate in the reaction. The air supply subsystem also comprises a condenser connected to the electric pile for condensing and separating water vapor in the gas discharged from the electric pile.

The thermal management subsystem may control and optimize the heat transfer process, reduce waste heat emissions, increase energy utilization efficiency, and improve overall fuel cell system performance. The heat management subsystem comprises a radiator, a circulating water pump, a cooling water tank, a thermostat, a temperature sensor and the like, wherein the cooling liquid is pumped out of the cooling water tank under the action of the circulating water pump, flows through a supercharging intercooler in the air supply subsystem and then flows through the electric pile to take away heat generated in the electric pile, and the heat of the cooling liquid is dissipated into the air through the radiator.

In a third aspect, the present application provides a vehicle comprising the fuel cell system of any one of the embodiments of the second aspect.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.

Claims (15)

1. An ejector, comprising:

The body is provided with an injection channel and a bypass channel;

The injection channel of the nozzle is communicated with the injection channel;

the nozzle is provided with a communication hole, the communication hole is positioned at the upstream of the secondary flow inlet of the injection channel, and the injection channel is communicated with the outlet of the bypass channel through the communication hole.

2. The ejector according to claim 1, wherein the nozzle includes a mounting section and a spraying section disposed in order in an axial direction, a cross-sectional dimension of the mounting section being larger than a cross-sectional dimension of the spraying section, and the communication hole is provided in the mounting section.

3. An ejector according to claim 2, wherein the mounting section is provided with a communication groove extending in a circumferential direction of the nozzle, the communication groove communicating with both the bypass passage and the communication hole.

4. An injector according to claim 3, wherein the communication groove is a ring groove; the size of the ring groove is not smaller than the aperture of the outlet of the bypass passage along the axial direction of the nozzle.

5. An ejector according to any one of claims 1 to 4, wherein the bypass passage is in parallel with the ejector passage.

6. The ejector of claim 5, wherein the inner wall of the ejector channel is provided with a guide surface, and the inlet of the bypass channel is located on the guide surface.

7. The eductor of any one of claims 1-4, further comprising a flow regulating valve disposed between the primary flow inlet and the secondary flow inlet of the eductor passageway, the nozzle being proximate the output of the flow regulating valve.

8. The ejector according to claim 7, wherein the ejector channel comprises a first channel section and a second channel section which are arranged in an angle, the body is provided with a mounting hole, the mounting hole corresponds to the position of the communication position of the first channel section and the second channel section, the valve body of the flow regulating valve is mounted in the mounting hole, the output end extends into the second channel section, and the nozzle is positioned in the second channel section.

9. The eductor of claim 7 wherein the output of the flow control valve is coaxially disposed with the nozzle; the nozzle is matched with the output end through a stepped shaft and a stepped hole structure.

10. The eductor of claim 9 wherein the middle of the output end abuts the nozzle; a sealing ring is arranged between the output end and the nozzle, and the sealing ring surrounds the middle part of the output end in a compressed state; the edge of the output end is arranged with the end face clearance of the nozzle.

11. The eductor of claim 7 wherein the nozzle is an interference fit or a transition fit with the eductor passageway; the nozzle is of a stepped shaft structure, and a shaft shoulder of the nozzle is abutted with the injection channel.

12. The eductor of claim 7 wherein the spool of the flow regulating valve comprises a spool body and a gasket connected to the spool body; the valve body of the flow regulating valve is provided with a convex ring for acting on the sealing gasket.

13. The ejector according to any one of claims 1 to 4, further comprising an on-off valve for opening and closing a primary inflow port of the ejector passage and/or a pressure sensor for detecting a medium pressure at an air outlet of the ejector passage.

14. A fuel cell system comprising the injector of any one of claims 1-13.

15. A vehicle comprising the fuel cell system of claim 14.