Ejector and fuel cell

Abstract

The utility model relates to the technical field of fuel cells, and provides an ejector and a fuel cell, the ejector comprises a nozzle, an ejector body and an adjusting piece, the nozzle is provided with a main drainage medium inlet and an injection orifice which are communicated with each other; the ejector body is in sealing fit with the nozzle, a mixing flow channel is formed in the ejector body, and the ejector body is provided with a drained medium inlet and a mixed medium outlet which are communicated with the mixing flow channel; the adjusting part is arranged in the injection opening, an annular injection channel is limited by the adjusting part and the inner wall of the injection opening, one end of the adjusting part is connected to the nozzle, the other end of the adjusting part is connected to the inner wall of the mixing flow channel, and the adjusting part is suitable for moving in the axial direction to adjust the flow area of the injection channel. The structural strength of the adjusting piece can be improved, the stability of the adjusting piece is further improved, and the situation that the performance and the service life of the ejector are affected due to poor stability of the adjusting piece is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to an ejector and a fuel cell. Background Art

[0002] The global energy structure is developing in the direction of lower and lower carbon content, and fuel cell vehicles have important advantages in carbon reduction. In order to ensure that there is enough reaction gas at the anode, the fuel cell usually introduces excess gas even if there is no hydrogen starvation near the outlet. In order to improve the gas utilization rate of hydrogen, a hydrogen circulation system is constructed. At present, there are two main ways of hydrogen circulation: ejector and circulation pump. The ejector is mainly used to mix the unreacted hydrogen at the anode of the fuel cell system with high-pressure hydrogen to form a mixed fluid, and use the high-pressure hydrogen flow to drive the unreacted hydrogen to flow together.

[0003] Due to the complex and changeable working conditions of fuel cells, the fixed structure ejector cannot meet the ejection working conditions under all hydrogen flow rates. When the stack is at low power output or the amount of hydrogen required for the reaction is small, the hydrogen flow rate entering the ejector from the hydrogen storage bottle will also decrease. Under such working conditions, the ejection performance of the ejector will decrease or even have no ejection effect. For this reason, an ejector with adjustable flow rate is used in the related art, that is, the position of the probe is controlled by an electromagnetic valve to control the flow rate of the recycled gas in the hydrogen circulation loop, so as to change the flow area of ​​the ejection port according to the stack power and the amount of hydrogen required by the stack.

[0004] Although the above methods can change the flow area of ​​the injection port according to the power of the fuel cell and the amount of hydrogen required by the fuel cell to improve the ejection effect of the ejector under different working conditions, since the diameter of the probe is generally less than 1 mm, the needle tip will shake if disturbed by the high-pressure airflow, and the stability is poor, which can easily affect the performance and life of the ejector. Utility Model Content

[0005] The first aspect of the utility model provides an ejector to solve the above-mentioned technical defects in the prior art, which can improve the structural strength of the adjusting member, thereby improving the stability of the adjusting member, and avoiding the performance and life of the ejector being affected by the poor stability of the adjusting member.

[0006] A second aspect of the utility model provides a fuel cell.

[0007] The first aspect of the utility model provides an ejector, comprising:

[0008] The nozzle is provided with a main drainage medium inlet and a jet port which are interconnected;

[0009] An ejector body, which is in sealing cooperation with the nozzle, wherein a mixing flow channel is formed inside the ejector body, and the ejector body is provided with an ejected medium inlet and a mixed medium outlet which are connected with the mixing flow channel;

[0010] An adjusting member is arranged in the injection port and limits an annular injection channel together with the inner wall of the injection port. One end of the adjusting member is connected to the nozzle, and the other end of the adjusting member is connected to the inner wall of the mixing channel. The adjusting member is suitable for moving axially to adjust the flow area of ​​the injection channel.

[0011] The utility model provides an ejector, which is convenient for adjusting the ejection channel by arranging an adjusting member in the ejection port and limiting an annular ejection channel with the inner wall of the ejection port, and adopting an annular ejection channel to replace the circular ejection channel in the related art; and one end of the adjusting member is connected to the nozzle, and the other end of the adjusting member is connected to the inner wall of the mixing flow channel to improve the stability of the adjusting member; when the adjusting member moves axially to adjust the flow area of ​​the ejection channel, both ends of the adjusting member are supported to avoid high-pressure airflow disturbance and shaking. Such an arrangement can also adaptively increase the diameter of the adjusting member and the caliber of the ejection port while maintaining the flow area of ​​the ejection channel, so as to improve the structural strength of the adjusting member, thereby improving the stability of the adjusting member and avoiding the performance and life of the ejector being affected by the poor stability of the adjusting member.

[0012] According to the ejector provided by the utility model, the adjusting member comprises a first rod segment, an adjusting segment and a second rod segment connected to each other;

[0013] The regulating section and the inner wall of the injection port limit the injection channel;

[0014] The first rod segment is connected to the nozzle, and the second rod segment is connected to the inner wall of the mixing channel.

[0015] According to the ejector provided by the utility model, the adjustment section is provided with a first side and a second side along the axial direction, the first side of the adjustment section is connected to the first rod section, and the second side of the adjustment section is connected to the second rod section;

[0016] The diameter of the first side of the adjusting section is greater than the diameter of the second side of the adjusting section; the diameter of the adjusting section gradually decreases from the first side of the adjusting section to the second side of the adjusting section, and the adjusting section transitions in a curve.

[0017] According to the ejector provided by the utility model, the diameter of the first side of the adjusting section is larger than the caliber of the injection port.

[0018] According to the ejector provided by the utility model, the adjusting member further comprises a slow flow section, and the slow flow section is connected between the first rod section and the adjusting section.

[0019] According to the ejector provided by the utility model, the slow flow section is provided with a first side and a second side along the axial direction, the first side of the slow flow section is connected to the first rod section, and the second side of the slow flow section is connected to the regulating section;

[0020] The diameter of the first side of the slow flow section is smaller than the diameter of the second side of the slow flow section; the diameter of the slow flow section gradually increases from the first side of the slow flow section to the second side of the slow flow section, and the slow flow section presents a curved transition.

[0021] According to the ejector provided by the utility model, the mixing flow channel includes a mixing section and a diffuser section which are connected to each other, the inlet of the drained medium is connected to the mixing section, and the outlet of the mixed medium is connected to the diffuser section;

[0022] An overlapping portion is provided on the inner wall of the mixing section, and the other end of the adjusting member is connected to the overlapping portion.

[0023] According to the ejector provided by the utility model, the mixing flow channel includes a mixing section and a diffuser section which are connected to each other, the inlet of the drained medium is connected to the mixing section, and the outlet of the mixed medium is connected to the diffuser section;

[0024] A supporting portion is provided on the inner wall of the diffuser section, and the adjusting member is provided with an extending section, and the extending section is connected to the supporting portion.

[0025] The ejector provided according to the utility model further includes a driving member, which is arranged on the nozzle or the ejector body, and is connected to the adjusting member, and is suitable for driving the adjusting member to move axially to adjust the flow area of ​​the injection channel.

[0026] A second aspect of the utility model provides a fuel cell, comprising the ejector described in any one of the items.

[0027] The fuel cell provided by the utility model has all the above advantages because it includes the above ejector. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of the ejector provided in an embodiment of the utility model.

[0030] Figure 2 It is a top view of the ejector provided in the embodiment of the utility model.

[0031] Figure 3 yes Figure 2 Sectional view along line AA.

[0032] Figure 4 It is a schematic diagram of the structure of the adjusting member in the ejector provided in the embodiment of the utility model.

[0033] Figure 5 This is one of the effect simulation schematic diagrams of the ejector provided in the embodiment of the utility model.

[0034] Figure 6 This is the second schematic diagram of the effect simulation of the ejector provided in the embodiment of the utility model.

[0035] Reference numerals:

[0036] 100, nozzle; 110, main drainage medium inlet; 120, injection port;

[0037] 200, ejector body; 210, mixing channel; 211, mixing section; 212, expansion section; 220, inlet of the drained medium; 230, outlet of the mixed medium; 240, support portion;

[0038] 300, adjusting member; 310, first rod section; 320, adjusting section; 330, second rod section; 340, slow flow section; 350, extension section;

[0039] 400. Driving parts. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0042] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] Figure 1 It is a structural schematic diagram of the ejector provided in the embodiment of the utility model; Figure 2 is a top view of the ejector provided by the embodiment of the utility model; Figure 3 yes Figure 2 Sectional view along line AA.

[0045] See also Figures 1 to 3 An embodiment of the utility model provides an ejector, which includes a nozzle 100, an ejector body 200 and an adjusting member 300.

[0046] The nozzle 100 is provided with a main drainage medium inlet 110 and an injection port 120 which are interconnected. The main drainage medium inlet 110 is used to connect a main drainage storage medium (such as a hydrogen storage bottle, etc.), and the high-pressure gas entering from the main drainage medium inlet 110 is ejected from the injection port 120.

[0047] The ejector body 200 is sealed with the nozzle 100. The main function of the ejector body 200 is to reduce the pressure of the high-pressure hydrogen from the hydrogen storage bottle and mix it with the hydrogen at the anode outlet of the stack, and then deliver the mixed hydrogen to the stack. The ejector body 200 has a mixing channel 210 inside, and the ejector body 200 is provided with a drained medium inlet 220 and a mixed medium outlet 230 connected to the mixing channel 210. The drained medium inlet 220 is used to connect to the anode outlet of the stack, and the mixed medium outlet 230 is connected to the inlet of the anode of the stack.

[0048] When the high-pressure hydrogen from the hydrogen storage bottle enters the injection channel after decompression, the pressure decreases and the speed increases. Through the mixing effect of the boundary, the high-pressure hydrogen (main injection flow) transfers energy to the hydrogen (injected injection flow) from the anode outlet of the stack. The mixed area formed by the mixing gradually expands and fills the entire mixing channel. After a period of mixing, the flow becomes almost uniform at the mixed medium outlet 230.

[0049] The adjusting member 300 is coaxially arranged in the injection port 120, and defines an annular injection channel with the inner wall of the injection port 120. One end of the adjusting member 300 is connected to the nozzle 100, and the other end of the adjusting member 300 is connected to the inner wall of the mixing flow channel 210. The adjusting member 300 is suitable for moving along the axial direction to adjust the flow area of ​​the injection channel. When the flow rate of the working fluid changes, the cross-sectional area of ​​the injection port 120 remains unchanged, and the flow area of ​​the injection channel changes accordingly, that is, when the flow rate of the working fluid increases, the cross-sectional area of ​​the injection port 120 remains unchanged, and the flow area of ​​the injection channel increases accordingly; when the flow rate of the working fluid decreases, the cross-sectional area of ​​the injection port 120 remains unchanged, and the flow area of ​​the injection channel decreases accordingly.

[0050] It is understandable that the ejector provided by the embodiment of the utility model, by coaxially arranging the adjusting member 300 in the injection port 120 and limiting the annular injection channel with the inner wall of the injection port 120, adopts an annular injection channel instead of the circular injection channel in the related art, so as to facilitate the adjustment of the injection channel; and one end of the adjusting member 300 is connected to the nozzle 100, and the other end of the adjusting member 300 is connected to the inner wall of the mixing flow channel 210, so as to improve the stability of the adjusting member 300; when the adjusting member 300 moves axially to adjust the flow area of ​​the injection channel, both ends of the adjusting member 300 are supported, so as to avoid the high-pressure air flow disturbance and shaking. Such a setting can also adaptively increase the diameter of the adjusting member 300 and the caliber of the injection port 120 while maintaining the flow area of ​​the injection channel, so as to improve the structural strength of the adjusting member 300, thereby improving the stability of the adjusting member 300, and avoiding the poor stability of the adjusting member 300 affecting the performance and life of the ejector.

[0051] Figure 4It is a schematic diagram of the structure of the adjusting member 300 in the ejector provided in the embodiment of the utility model.

[0052] See also Figure 4 In some embodiments of the utility model, the adjusting member 300 includes a first rod segment 310, an adjusting segment 320, and a second rod segment 330 which are connected to each other. The adjusting segment 320 and the inner wall of the injection port 120 limit the injection channel. The first rod segment 310 is connected to the nozzle 100, and the second rod segment 330 is connected to the inner wall of the mixing channel 210.

[0053] Equivalently, the first rod segment 310 and the second rod segment 330 are both cylindrical segments of equal diameter, while the adjustment segment 320 is a variable diameter segment. The first rod segment 310 and the second rod segment 330 mainly play a supporting role, while the adjustment segment 320 adjusts its relative position with the injection port 120 by changing its own position, thereby adjusting the flow area of ​​the injection channel.

[0054] The diameters of the first rod segment 310 and the second rod segment 330 may be equal. In this case, it is equivalent to machining a gradient segment on a straight rod, and the diameter of the gradient segment is gradually larger than the diameter of the first rod segment 310 or the second rod segment 330 .

[0055] Of course, the diameters of the first rod segment 310 and the second rod segment 330 may also be unequal. In this case, it is equivalent to the adjusting member 300 being a stepped shaft with a gradual section formed at the step. In this case, the diameter of the first rod segment 310 is greater than the diameter of the second rod segment 330 .

[0056] Continue reading Figure 4 In some embodiments of the present invention, the adjustment section 320 is provided with a first side and a second side along the axial direction, that is, the adjustment section 320 has a certain length, the first side of the adjustment section 320 is connected to the first rod section 310, and the second side of the adjustment section 320 is connected to the second rod section 330.

[0057] The diameter of the first side of the adjusting section 320 is greater than the diameter of the second side of the adjusting section 320; the diameter of the adjusting section 320 gradually decreases from the first side of the adjusting section 320 to the second side of the adjusting section 320, and the adjusting section 320 presents a curved transition. The adjusting section 320 not only presents a curved transition, but can also intensify or slow down the rate of change according to actual working conditions and flow area requirements, thereby ensuring that the outer edge of the injection port 120 is the smallest point of the flow channel.

[0058] In other words, in the above embodiment, the adjustment section 320 can be in a straight line transition, or the adjustment section 320 can be in a step transition. In the present embodiment, the adjustment section 320 is in a curved transition, which can ensure the continuity of the airflow during the movement of the adjustment section 320 relative to the injection port 120, so as to achieve stepless adjustment and reduce the influence of the airflow disturbance on the fuel cell stack during the movement of the adjustment section 320 relative to the injection port 120.

[0059] In addition, in some embodiments of the present invention, the diameter of the first side of the adjusting section 320 is larger than the caliber of the injection port 120, that is, the diameter of the most protruding position of the adjusting section 320 is larger than the caliber of the injection port 120. In this way, it can not only limit the adjusting member 300 and prevent the adjusting position of the adjusting section 320 from exceeding the injection port 120; but also, when the most protruding position of the adjusting section 320 abuts against the inner wall of the injection port 120, it can block the injection channel and achieve the effect of cutting off the high-pressure airflow.

[0060] Continue reading Figure 4 In some embodiments of the present invention, the adjusting member 300 further includes a slow flow section 340 , and the slow flow section 340 is connected between the first rod section 310 and the adjusting section 320 .

[0061] In other words, in the above embodiments, the side of the regulating section 320 located at the first rod section 310 can be a plane. In this way, when the high-pressure airflow passes through the plane, the backflow is likely to generate turbulence at the front end of the regulating section 320, thereby affecting the flow rate of the high-pressure airflow (injection airflow) and affecting the injection effect. The utility model provides a slow flow section 340 between the first rod section 310 and the regulating section 320 to alleviate the turbulence phenomenon and ensure a better injection effect of the ejector.

[0062] Furthermore, the slow flow section 340 is provided with a first side and a second side along the axial direction, the first side of the slow flow section 340 is connected to the first rod section 310 , and the second side of the slow flow section 340 is connected to the regulating section 320 .

[0063] The diameter of the first side of the slow flow section 340 is smaller than the diameter of the second side of the slow flow section 340 ; the diameter of the slow flow section 340 gradually increases from the first side of the slow flow section 340 to the second side of the slow flow section 340 , and the slow flow section 340 presents a curved transition.

[0064] In this embodiment, the slow flow section 340 has a curved transition, which can ensure the continuity of the airflow when the slow flow section 340 moves with the adjusting member 300, so as to achieve stepless adjustment and reduce the impact of airflow disturbance on the battery stack when the slow flow section 340 moves with the adjusting member 300.

[0065] It should be noted that the slow flow section 340 can be symmetrically arranged with the above-mentioned adjustment section 320, so as to ensure better continuity of the airflow when the adjustment section 320 moves relative to the injection port 120, thereby helping to reduce the vibration of the adjustment member 300 caused by the airflow disturbance, and is beneficial to enhancing the stability of the adjustment member 300.

[0066] Of course, the slow flow section 340 can also be set in an asymmetric form with the above-mentioned adjustment section 320, for example, the adjustment section 320 has a curved transition, while the slow flow section 340 has a straight line or stepped transition.

[0067] Continue reading Figure 3 In some embodiments of the present invention, the mixing channel 210 includes a mixing section 211 and a diffuser section 212 that are interconnected, the drained medium inlet 220 is connected to the mixing section 211, and the mixed medium outlet 230 is connected to the diffuser section 212. The mixed hydrogen flows through the diffuser section 212, the speed of the mixed hydrogen decreases, and the pressure increases to reach the pressure required at the anode inlet of the stack. Finally, the mixed hydrogen flows into the stack through the anode inlet of the stack.

[0068] Among them, an overlapping portion (not shown in the figure) is provided on the inner wall of the mixing section 211, and the other end of the adjusting member 300 is connected to the overlapping portion, which is equivalent to providing an overlapping portion for supporting the second rod segment 330 on the inner wall of the mixing section 211. The overlapping portion can be a structure such as a boss or a groove. The second rod segment 330 can be overlapped on the boss or cooperate with the groove guide.

[0069] The overlapping portion for supporting the second rod segment 330 is arranged on the inner wall of the mixing segment 211 . The overlapping portion is located on the flow path of the mixed gas, so it is easy to affect the flow of the mixed gas.

[0070] To this end, in some embodiments of the utility model, the adjusting member 300 is provided with an extension section 350, which is connected to a support portion 240 arranged on the inner wall of the diffuser section 212. The support portion 240 has the same function and effect as the above-mentioned overlap portion, and is mainly used to support the second rod segment 330.

[0071] Since the inner wall of the diffuser section 212 is not likely to affect the flow of the mixed gas, arranging the support portion 240 at this position can not only play a supporting role but also does not affect the flow path of the original ejector.

[0072] Specifically, a protrusion may be provided on the outer wall of the ejector body 200 , and a groove connected to the diffuser section 212 may be provided inside the protrusion, and the groove forms the support portion 240 .

[0073] Continue reading Figures 1 to 3 In some embodiments of the present invention, the ejector further includes a driving member 400, which is disposed on the nozzle 100 or the ejector body 200. The driving member 400 is connected to the adjusting member 300 and is suitable for driving the adjusting member 300 to move axially to adjust the flow area of ​​the injection channel.

[0074] The driving member 400 may be a solenoid valve or a linear motor, and any driving structure that can mainly realize the reciprocating motion of the adjusting member 300 is acceptable. The form of the supporting portion 240 may be determined according to the linear reciprocating motion mode of the adjusting member 300. For example, when the adjusting member 300 is driven by a linear motor to realize the reciprocating motion, the supporting portion 240 may be a groove or a through hole.

[0075] In addition, the support portion 240 can also be set as a threaded hole, which can realize rotational movement and position limitation at the same time, so as to keep the position of the adjustment member 300 from being easily moved, so as to improve the accurate adjustment of the flow area of ​​the injection channel.

[0076] In addition to using the driving member 400 to adjust the position of the adjusting member 300, the adjusting member 300 can also be adjusted manually. Therefore, the driving member 400 is not necessarily used for active adjustment, and adaptive adjustment can be performed according to usage requirements and applicable scenarios.

[0077] In addition, the driving member 400 can be arranged in the nozzle 100 or in the ejector body 200. When the driving member 400 is arranged in the nozzle 100, it is equivalent to the driving member 400 being connected to one end of the first rod segment 310. When the driving member 400 is arranged in the ejector body 200, it is equivalent to the driving member 400 being connected to one end of the second rod segment 330.

[0078] Figure 5 This is one of the effect simulation schematic diagrams of the ejector provided by the embodiment of the utility model; Figure 6 This is the second schematic diagram of the effect simulation of the ejector provided in the embodiment of the utility model.

[0079] See also Figure 5 When the flow rate of the working fluid decreases, the cross-sectional area of ​​the injection port 120 remains unchanged, and the adjusting member 300 moves to drive part of the adjusting section 320 to enter the injection port 120 to reduce the gap between the adjusting section 320 and the injection port 120, that is, to reduce the flow area of ​​the injection channel and increase the flow rate of the injection port 120.

[0080] See also Figure 6 When the flow rate of the working fluid increases, the cross-sectional area of ​​the injection port 120 remains unchanged, and the adjusting member 300 moves to drive part of the adjusting section 320 to exit the injection port 120, so as to increase the gap between the adjusting section 320 and the injection port 120, that is, to increase the flow area of ​​the injection channel, so as to adjust the flow rate of the injection port 120.

[0081] Therefore, by controlling the operation of the driving member 400 to drive the adjusting section 320 to enter the injection port 120 or exit the injection port 120, the gap between the adjusting section 320 and the injection port 120 is adjusted, and the flow area of ​​the injection channel is further adjusted to achieve the speed of the mixed medium outlet 230 to reach the required speed of the injection flow.

[0082] The utility model utilizes an annular injection channel to replace the circular injection channel, and uses a rod-shaped adjustment member 300 with a variable cross-section as a method for adjusting the injection channel. Since the diameter of the injection port 120 is a fixed value, the position change of the rod-shaped adjustment member 300 with a variable cross-section serves as the variable value of the annular injection channel. By moving the adjustment rod forward and backward along the axial direction to adjust the area of ​​the injection channel, it is ensured that an induced airflow can be formed at different flow rates.

[0083] Among them, the continuously curved adjustment rod ensures the continuity of the airflow, and while achieving stepless adjustment, it ensures that when the flow area of ​​the injection channel changes, the impact of airflow disturbance on the battery stack is reduced. In addition, while keeping the flow area of ​​the injection channel unchanged, the diameter of the adjustment member 300 and the caliber of the injection port 120 can be adaptively increased to improve the structural strength of the adjustment member 300, thereby improving the stability of the adjustment member 300 and avoiding affecting the performance and life of the ejector due to the poor stability of the adjustment member 300.

[0084] The present invention also provides a fuel cell, comprising any of the above ejectors. Since the fuel cell comprises the above ejector, it has all the above advantages.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An ejector, characterized in that: include: The nozzle is provided with a main drainage medium inlet and a jet port which are interconnected; An ejector body, which is in sealing cooperation with the nozzle, wherein a mixing flow channel is formed inside the ejector body, and the ejector body is provided with an ejected medium inlet and a mixed medium outlet which are connected with the mixing flow channel; An adjusting member is arranged in the injection port; the adjusting member comprises a first rod segment, an adjusting segment and a second rod segment which are connected to each other, the adjusting segment and the inner wall of the injection port limit an annular injection channel, the first rod segment is connected to the nozzle, the second rod segment is connected to the inner wall of the mixing flow channel, and the adjusting member is suitable for moving axially to adjust the flow area of ​​the injection channel.

2. The ejector according to claim 1, characterized in that: The adjusting section is provided with a first side and a second side along the axial direction, the first side of the adjusting section is connected to the first rod section, and the second side of the adjusting section is connected to the second rod section; The diameter of the first side of the adjusting section is greater than the diameter of the second side of the adjusting section; the diameter of the adjusting section gradually decreases from the first side of the adjusting section to the second side of the adjusting section, and the adjusting section transitions in a curve.

3. The ejector according to claim 2, characterized in that: The diameter of the first side of the adjusting section is greater than the diameter of the injection port.

4. The ejector according to claim 1, characterized in that: The adjusting member further comprises a slow flow section connected between the first rod section and the adjusting section.

5. The ejector according to claim 4, characterized in that: The slow flow section is provided with a first side and a second side along the axial direction, the first side of the slow flow section is connected to the first rod section, and the second side of the slow flow section is connected to the regulating section; The diameter of the first side of the slow flow section is smaller than the diameter of the second side of the slow flow section; the diameter of the slow flow section gradually increases from the first side of the slow flow section to the second side of the slow flow section, and the slow flow section presents a curved transition.

6. The ejector according to any one of claims 1 to 5, characterized in that: The mixing flow channel comprises a mixing section and a diffuser section which are connected to each other, the inlet of the guided medium is connected to the mixing section, and the outlet of the mixed medium is connected to the diffuser section; An overlapping portion is provided on the inner wall of the mixing section, and the other end of the adjusting member is connected to the overlapping portion.

7. The ejector according to any one of claims 1 to 5, characterized in that: The mixing flow channel comprises a mixing section and a diffuser section which are connected to each other, the inlet of the guided medium is connected to the mixing section, and the outlet of the mixed medium is connected to the diffuser section; A supporting portion is provided on the inner wall of the diffuser section, and the adjusting member is provided with an extending section, and the extending section is connected to the supporting portion.

8. The ejector according to any one of claims 1 to 5, characterized in that: It also includes a driving member, which is arranged on the nozzle or the ejector body, and is connected to the adjusting member, and is suitable for driving the adjusting member to move axially to adjust the flow area of ​​the injection channel.

9. A fuel cell, characterized in that: The ejector comprises the ejector as described in any one of claims 1 to 8.

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