Ejector device and fuel cell

Abstract

The utility model relates to the technical field of fuel cells, and provides an ejector device and a fuel cell, the ejector device comprises an ejector assembly and a valve body, the ejector assembly is provided with a drained medium inlet and a mixed medium outlet, at least two ejection flow channels are constructed in the ejector assembly, and the valve body is arranged in the valve body. Each ejection flow channel is respectively communicated with the guided medium inlet and the mixed medium outlet, and the flow area of one ejection flow channel is smaller than that of the other ejection flow channels; the valve bodies are arranged on other injection flow channels and suitable for blocking or opening the corresponding injection flow channels under the action of air pressure. The valve body is controlled to move in the corresponding ejection flow channels through the pressure difference on the two sides of the valve body, so that free switching between a single ejection flow channel and a plurality of ejection flow channels under different working conditions is achieved, the complexity degree of system control can be reduced, and the reliability of a system is improved; and meanwhile, the two independent ejectors are integrated, so that the occupied volume and weight of the whole structure can be reduced.

Description

Technical Field

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

[0002] In the related art, since the working range of a single ejector is relatively narrow, two independent ejectors are generally connected in parallel to realize exhaust gas reflux, so as to ensure that the ejector can work in a wider working range. Although the use of two independent ejectors in parallel can achieve a wider working range, since each ejector needs to be controlled by a solenoid valve, electrical components are added, making the structural system more complicated. Utility Model Content

[0003] The first aspect of the utility model provides an ejector device to solve the above-mentioned technical defects in the prior art. The pressure difference on both sides of the valve body is used to control the movement of the valve body in the corresponding ejector channel to realize the free switching of the primary ejector channel and the secondary ejector channel under different working conditions. This process does not require the setting of electrical components and corresponding control circuits, and the system structure is simpler.

[0004] A second aspect of the utility model provides a fuel cell.

[0005] A first aspect of the utility model provides an ejector device, comprising an ejector assembly and a valve body.

[0006] The ejector assembly is provided with an inlet for the drained medium and an outlet for the mixed medium. The ejector assembly is internally structured with at least two ejection channels, each of which is respectively connected to the inlet for the drained medium and the outlet for the mixed medium, and the flow area of ​​one of the ejection channels is smaller than the flow area of ​​the other ejection channels;

[0007] The valve body is arranged on the other injection flow channels, and the valve body is suitable for blocking or opening the corresponding injection flow channel under the action of air pressure.

[0008] The utility model provides an ejector device, which constructs at least two ejector channels in the ejector assembly, wherein the flow area of ​​one ejector channel is smaller than the flow area of ​​the other ejector channels, so that the flow resistance of one ejector channel is smaller than the flow resistance of the other ejector channels, and a valve body is arranged in the other ejector channels, and the pressure difference on both sides of the valve body is used to control the movement of the valve body in the corresponding ejector channel, so as to realize free switching of a single ejector channel and multiple ejector channels under different working conditions, reduce the control of electrical components, thereby reducing the complexity of system control and improving the reliability of the system.

[0009] In addition, by constructing at least two ejector channels inside the ejector assembly to integrate the two independent ejectors into an integrated setting, the volume and weight of the overall structure can be reduced, thereby saving installation space and production costs.

[0010] According to an ejector device provided by the utility model, the valve body comprises a sealing portion and a sliding portion connected to each other; the sliding portion is slidably matched with the inner wall of the ejector channel;

[0011] When the valve body blocks the ejection channel, the sealing portion is suitable for sealingly cooperating with the inner wall of the ejection channel; when the valve body opens the ejection channel, the sealing portion is suitable for forming a flow gap with the inner wall of the ejection channel.

[0012] According to an ejector device provided by the utility model, the sealing part is provided with a flow hole, the interior of the sealing part is provided with a first flow channel connected to the flow hole; the interior of the sliding part is provided with a second flow channel connected to the first flow channel;

[0013] When the valve body opens the ejection channel, the flow gap is communicated with the first channel through the flow hole.

[0014] According to an ejector device provided by the utility model, the valve body further comprises a sealing member, and the sealing member is sleeved on the outer surface of the sealing portion.

[0015] According to an ejector device provided by the utility model, a sealing groove is provided on the outer surface of the valve body, and the sealing member is embedded in the sealing groove.

[0016] According to an ejector device provided by the utility model, each ejector flow channel includes a contraction section, a mixing section and a diffusion section which are interconnected;

[0017] The sealing part and the sliding part are both arranged at the diffuser section of the corresponding ejector flow channel.

[0018] According to an ejector device provided by the utility model, the diffuser section comprises a first sub-diffuser section, a second sub-diffuser section and a flow section which are connected in sequence, the angle of the second sub-diffuser section is greater than the angle of the first sub-diffuser section, and the length of the second sub-diffuser section is less than the length of the first sub-diffuser section;

[0019] The sliding portion is slidably matched with the inner wall of the flow section;

[0020] When the valve body blocks the ejector channel, the sealing portion is in sealing cooperation with the inner wall of the first sub-diffuser section.

[0021] According to an ejector device provided by the utility model, the diffuser section further comprises a sealing section, and the sealing section is located between the first sub-diffuser section and the second sub-diffuser section;

[0022] When the valve body blocks the ejection channel, the sealing portion is in sealing cooperation with the inner wall of the sealing section.

[0023] According to an ejector device provided by the utility model, the flow area of ​​the ejector flow channel is positively correlated with the flow resistance of the corresponding ejector flow channel.

[0024] According to an ejector device provided by the utility model, the ejector assembly comprises an ejector body, a first cover body and a second cover body, wherein the first cover body and the second cover body are respectively detachably connected to the ejector body;

[0025] The inlet of the drained medium is arranged on the first cover body, and the outlet of the mixed medium is arranged on the second cover body; at least two of the ejection channels are arranged inside the ejector body.

[0026] According to an ejector device provided by the utility model, it also includes a base, and the ejector assembly is arranged on the base; the base is provided with nozzles corresponding to the positions of at least two ejection channels one by one, and the nozzles are connected to the corresponding ejection channels.

[0027] A second aspect of the utility model provides a fuel cell, comprising the ejector device described in any one of the items.

[0028] The fuel cell provided by the utility model comprises the above-mentioned ejector device and thus has all the advantages of the above-mentioned ejector device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces 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 creative work.

[0030] Figure 1 It is a cross-sectional view of the ejector device provided in an embodiment of the utility model.

[0031] Figure 2 It is a structural schematic diagram of a valve body in an ejector device provided in an embodiment of the utility model.

[0032] Figure 3 It is a schematic diagram of the dimensions of the ejector device provided in the embodiment of the utility model.

[0033] Figure 4 It is a schematic diagram of the structure of the ejector device provided in an embodiment of the utility model.

[0034] Reference numerals:

[0035] 100, ejector assembly; 110, ejector body; 111, primary ejector channel; 112, secondary ejector channel; 113, contraction section; 114, mixing section; 115, expansion section; 1151, first sub-expansion section; 1152, second sub-expansion section; 1153, flow section; 1154, sealing section; 120, first cover; 121, inlet of the medium to be ejected; 130, second cover; 131, outlet of the mixed medium;

[0036] 200, valve body; 210, sealing part; 211, flow hole; 212, first flow channel; 213, sealing groove; 220, sliding part; 221, second flow channel; 230, sealing member;

[0037] 300, base; 310, nozzle;

[0038] 400. Solenoid valve. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Figure 1 is a cross-sectional view of an ejector device provided by an embodiment of the utility model; Figure 2 It is a structural schematic diagram of a valve body in an ejector device provided in an embodiment of the utility model; Figure 3 It is a schematic diagram of the dimensions of the ejector device provided in the embodiment of the utility model; Figure 4 It is a schematic diagram of the structure of the ejector device provided in an embodiment of the utility model.

[0044] See also Figures 1 to 4 An embodiment of the utility model provides an ejector device, which includes an ejector assembly 100 and a valve body 200.

[0045] The main function of the ejector assembly 100 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 assembly 100 is provided with an inlet 121 for the drained medium and an outlet 131 for the mixed medium. The ejector assembly 100 is internally constructed with at least two ejector channels, each of which is connected to the inlet 121 for the drained medium and the outlet 131 for the mixed medium, respectively, and the flow area of ​​one ejector channel is smaller than the flow area of ​​the other ejector channels; that is, at least two ejector channels can be constructed inside the ejector assembly 100, and three ejector channels, four ejector channels, etc. can also be constructed in parallel inside the ejector assembly 100. However, no matter how many ejector channels are set, it is necessary to ensure that the flow area of ​​one ejector channel is smaller than the flow area of ​​other ejector channels, so that the flow resistance of this ejector channel is smaller than the flow resistance of other ejector channels, so that when the working fluid is small, it can flow preferentially from the ejector channel with smaller flow resistance.

[0046] The valve body 200 is arranged in other injection flow channels. The valve body 200 is similar to a slider. The valve body 200 can block or open the corresponding injection flow channels under the action of air pressure. When the working fluid flows from the injection flow channel with smaller flow resistance to the position of the mixed medium outlet 131, other injection flow channels generate negative pressure, so that the valve body and the inner wall of the corresponding injection flow channel are sealed and matched. That is, the pressure difference on both sides of the valve body 200 controls the movement of the valve body 200 in the corresponding injection flow channel to realize the free switching of a single injection flow channel and multiple injection flow channels under different working conditions.

[0047] It can be understood that the ejector device provided in the embodiment of the utility model constructs at least two ejector channels inside the ejector assembly 100, wherein the flow area of ​​one ejector channel is smaller than the flow area of ​​the other ejector channels, so that the flow resistance of one ejector channel is smaller than the flow resistance of the other ejector channels, and a valve body 200 is arranged in the other ejector channels, and the pressure difference on both sides of the valve body 200 is used to control the movement of the valve body 200 in the corresponding ejector channel, so as to realize the free switching of a single ejector channel and multiple ejector channels under different working conditions, reduce the control of electrical components, and further reduce the complexity of system control and improve the reliability of the system.

[0048] In addition, by constructing at least two ejector channels inside the ejector assembly 100 to integrate the two independent ejectors into an integrated setting, the volume and weight of the entire structure can be reduced, thereby saving installation space and production costs.

[0049] For example, the embodiment of the utility model is explained by taking the example of constructing two ejection channels inside the ejector assembly 100, that is, there is a first-level ejection channel 111 and a second-level ejection channel 112 inside the ejector assembly 100, the first-level ejection channel 111 is connected to the inlet 121 of the drained medium and the outlet 131 of the mixed medium, the second-level ejection channel 112 is connected to the inlet 121 of the drained medium and the outlet 131 of the mixed medium, and the flow area of ​​the first-level ejection channel 111 is smaller than the flow area of ​​the second-level ejection channel 112, that is, the flow resistance of the first-level ejection channel 111 is smaller than the flow resistance of the second-level ejection channel 112.

[0050] When the flow rate of the working fluid decreases, the first-stage ejection channel 111 can satisfy the ejection function of the ejector device, the first-stage ejection channel 111 is connected, the working fluid is ejected through the first-stage ejection channel 111, and the second-stage ejection channel 112 is not connected, and there is a pressure difference on both sides of the valve body 200, and the negative pressure makes the valve body 200 move to Figure 1 The left side is moved as shown to block the secondary ejection channel 112 .

[0051] When the flow rate of the working fluid increases, it is necessary to use the primary injection channel 111 and the secondary injection channel 112 to jointly complete the injection function. The primary injection channel 111 and the secondary injection channel 112 are both connected, and the primary injection channel 111 normally realizes the injection function. The working fluid passes through the secondary injection channel 112 to push the valve body 200 to the Figure 1 The right side is pushed as shown to open the secondary injection channel 112 to achieve the double injection function.

[0052] Among them, the conductance between the first-level injection channel 111 and the second-level injection channel 112 is controlled by the solenoid valve 400. Since the valve body 200 is arranged in the second-level injection channel 112, the conductance and closing of the first-level injection channel 111 and the conductance and closing of the second-level injection channel 112 can be controlled by one solenoid valve 400, which can reduce the number of solenoid valves 400 to simplify the structure of the ejector device.

[0053] It should be noted that the embodiment of the utility model is described by taking two injection channels as an example. The situation of multiple injection channels is similar to the situation of two injection channels, that is, the first-stage injection channel 111 is always turned on to retain the injection function of the ejector device, and the second-stage injection channel 112 and the multi-stage injection channel can be selectively opened or closed according to different working conditions.

[0054] For example, when there are three injection channels, one of them is the first-level injection channel 111, another is the second-level injection channel 112, and the third is the third-level injection channel. The first-level injection channel 111, the second-level injection channel 112 and the third-level injection channel are all arranged in parallel, wherein the flow area of ​​the second-level injection channel 112 is larger than that of the first-level injection channel 111, and the flow area of ​​the third-level injection channel is larger than that of the second-level injection channel 112, that is, the flow resistance of the second-level injection channel 112 is larger than that of the first-level injection channel 111, and the flow resistance of the third-level injection channel is larger than that of the second-level injection channel 112, and valve bodies 200 are arranged in the second-level injection channel 112 and the third-level injection channel.

[0055] Continue reading Figure 1 and Figure 2 In some embodiments of the present invention, the valve body 200 includes a sealing portion 210 and a sliding portion 220 that are connected to each other, that is, the valve body 200 as a whole is composed of the sealing portion 210 and the sliding portion 220.

[0056] Among them, the sliding part 220 slidably cooperates with the inner wall of the ejection channel; the sealing part 210 can seal and cooperate with the inner wall of the ejection channel when the valve body 200 blocks the ejection channel; the sealing part 210 can form a flow gap with the inner wall of the ejection channel when the valve body 200 opens the ejection channel, that is, open the corresponding ejection channel.

[0057] Equivalently, when the cross-sectional shape of the ejection channel is circular, and the corresponding cross-sectional shape of the valve body 200 is circular, the diameter of the sliding portion 220 is greater than the diameter of the sealing portion 210, and the sliding portion 220 drives the sealing portion 210 to move in the corresponding ejection channel under the action of air pressure to achieve sealing or unsealing. Moreover, the length of the sealing portion 210 is greater than the length of the sliding portion 220, which can increase the sealing area and achieve a good sealing effect.

[0058] Continue reading Figure 2 In some embodiments of the utility model, the sealing portion 210 is provided with a flow hole 211, and a first flow channel 212 connected to the flow hole 211 is provided inside the sealing portion 210; a second flow channel 221 connected to the first flow channel 212 is provided inside the sliding portion 220.

[0059] When the valve body 200 opens the ejection channel, the flow gap of the sealing part 210 is connected to the first channel 212 through the flow hole 211. That is, the working fluid enters the corresponding ejection channel, and the pressure of the working fluid pushes the valve body 200 to move, so that there is a flow gap between the sealing part 210 and the ejection channel through which the fluid can pass. After the fluid enters the flow gap, it enters the first channel 212 from the flow hole 211, and then enters the second channel 221, so as to be ejected and discharged from the mixed medium outlet 131, which is equivalent to making the ejection channel provided with the valve body 200 conductive.

[0060] Of course, the flow hole 211 can also be set on the step surface between the sealing part 210 and the sliding part 220. In this case, it is not necessary to set the first flow channel 212 in the sealing part 210. The sealing part 210 mainly plays a sealing role, which is equivalent to the flow hole 211 directly connecting the second flow channel 221.

[0061] Continue reading Figure 2 In some embodiments of the present invention, in order to avoid wear between the sealing part 210 and the inner wall of the ejection channel, the valve body 200 also includes a sealing member 230, which can be an elastic rubber pad, etc. The sealing member 230 is sleeved on the outer surface of the sealing part 210, and the sealing part 210 contacts the inner wall of the ejection channel through the sealing member 230, so as to avoid the phenomenon of hard collision between the sealing part 210 and the inner wall of the corresponding ejection channel.

[0062] At the same time, the sealing member 230 can further enhance the sealing effect, ensure the reliability of the valve body 200, and avoid air leakage after the valve body 200 blocks the corresponding injection flow channel.

[0063] Continue reading Figure 2 In some embodiments of the present invention, in order to improve the stability of the seal 230, a sealing groove 213 is provided on the outer surface of the valve body 200, and the seal 230 is embedded in the sealing groove 213. The position of the seal 230 is limited by the sealing groove 213, so as to prevent the position of the seal 230 from changing after multiple frictions, thereby affecting the contact between the sealing portion 210 and the ejection channel, and affecting the sealing effect of the seal 230.

[0064] Continue reading Figure 1 In some embodiments of the present invention, each ejection channel includes a contraction section 113, a mixing section 114 and a diffuser section 115 that are interconnected. The sealing portion 210 and the sliding portion 220 are both disposed at the diffuser section 115 of the corresponding ejection channel.

[0065] Since the diffuser section 115 is connected to the mixed medium outlet 131, the negative pressure effect on the valve body 200 at this position is more obvious, and the blocking effect of the valve body 200 is better. Of course, if the valve body 200 is set at other positions of the ejection channel, it is possible to achieve the purpose of blocking or opening the ejection channel.

[0066] Continue reading Figure 1 In some embodiments of the present invention, the diffuser section 115 includes a first sub-diffuser section 1151, a second sub-diffuser section 1152 and a flow section 1153 which are connected in sequence. The angle of the second sub-diffuser section 1152 is greater than the angle of the first sub-diffuser section 1151, and the length of the second sub-diffuser section 1152 is less than the length of the first sub-diffuser section 1151.

[0067] The sliding portion 220 is in sliding cooperation with the inner wall of the flow section 1153 ; when the valve body 200 blocks the ejection channel, the sealing portion 210 is in sealing cooperation with the inner wall of the first sub-diffuser section 1151 .

[0068] It is understandable that by improving the structure of the diffuser section 115, the adapter valve body 200 can automatically slide more smoothly in the corresponding ejection channel under the action of negative pressure to achieve the purpose of blocking or opening the corresponding ejection channel, and the flow area can be increased, thereby increasing the flow resistance.

[0069] Continue reading Figure 1 In some embodiments of the present invention, the diffuser section 115 further includes a sealing section 1154, which is located between the first sub-diffuser section 1151 and the second sub-diffuser section 1152. When the valve body 200 blocks the ejection channel, the sealing portion 210 seals with the inner wall of the sealing section 1154.

[0070] Since the inner wall of the first sub-diffuser section 1151 is an inclined surface in the above-mentioned embodiment, when the sealing portion 210 abuts against the inner wall of the first sub-diffuser section 1151, the pressure on both sides of the valve body 200 changes slightly, and the valve body 200 will move, which has poor reliability. In the present embodiment, the sealing section 1154 is formed between the first sub-diffuser section 1151 and the second sub-diffuser section 1152, and the inner wall of the sealing section 1154 is flat. When the sealing portion 210 abuts against the sealing section 1154, the pressure on both sides of the valve body 200 changes slightly, and the valve body 200 will not move immediately until the negative pressure on both sides of the valve body 200 can completely push the sealing portion 210 of the valve body 200 to be separated from the inner wall of the sealing section 1154, which has high reliability.

[0071] Continue reading Figure 1 In some embodiments of the present invention, in order to prevent the fluid from forming a large resistance on the end surface of the valve body 200, a conical buffer surface is provided at the end of the sealing portion 210.

[0072] It should also be noted that the flow area of ​​the ejector flow channel is positively correlated with the flow resistance of the corresponding ejector flow channel. For example, when the ejector body 110 has two ejector flow channels, namely, the primary ejector flow channel 111 and the secondary ejector flow channel 112, the flow area of ​​the secondary ejector flow channel 112 is set to be larger than the flow area of ​​the primary ejector flow channel 111, that is, the flow resistance of the secondary ejector flow channel 112 is larger than the flow resistance of the primary ejector flow channel 111, and the following method can be adopted.

[0073] like Figure 3As shown, the diameter Dn of the jet port of the nozzle 310 corresponding to the secondary jet channel 112 can be set to be larger than the diameter of the jet port of the nozzle 310 corresponding to the primary jet channel 111; the spray mixing spacing NXP of the secondary jet channel 112 can also be set to be larger than the spray mixing spacing of the primary jet channel 111. In addition, when the angle A of the first mixing section is equal, the length Le of the first mixing section of the secondary jet channel 112 can be set to be larger than the length of the first mixing section of the primary jet channel 111; the diameter Dm of the second mixing section of the secondary jet channel 112 can also be set to be larger than the diameter of the second mixing section of the primary jet channel 111; the length Lm of the second mixing section of the secondary jet channel 112 can also be set to be larger than the length of the second mixing section of the primary jet channel 111; when the angle B of the diffuser section 115 is equal, the length Le of the diffuser section 115 of the secondary jet channel 112 can be set to be larger than the length of the diffuser section 115 of the primary jet channel 111.

[0074] Continue reading Figure 4 In some embodiments of the present invention, the ejector assembly 100 includes an ejector body 110, a first cover 120 (i.e., a lower cover) and a second cover 130 (i.e., an end cover), and the first cover 120 and the second cover 130 are detachably connected to the ejector body 110. The inlet 121 of the drained medium is provided on the first cover 120, and the outlet 131 of the mixed medium is provided on the second cover 130; at least two ejection channels are provided inside the ejector body 110.

[0075] In other words, the ejector assembly 100 can be formed as an integral unit or assembled from a plurality of parts. In order to reduce the difficulty of processing the ejector assembly 100, the ejector assembly 100 is assembled from three parts, namely, an ejector body 110, a first cover body 120 and a second cover body 130.

[0076] Continue reading Figure 4 In some embodiments of the present invention, the ejector device further comprises a base 300, and the ejector assembly 100 is disposed on the base 300. The base 300 is provided with nozzles 310 corresponding to the positions of at least two ejection channels, and the nozzles 310 are connected to the corresponding ejection channels.

[0077] When the high-pressure hydrogen from the hydrogen storage bottle is decompressed and enters the ejection channel through the nozzle 310, the pressure decreases and the speed increases. Through the mixing effect of the boundary, the high-pressure hydrogen (main ejection flow) transfers energy to the hydrogen (ejection flow) from the anode outlet of the stack. The mixed area formed by the mixing gradually expands and fills the entire ejection channel. After a period of mixing, it becomes almost a uniform flow when it flows to the mixed medium outlet 131.

[0078] The embodiment of the utility model further provides a fuel cell, comprising the ejector device described above. Since the fuel cell comprises the ejector device described above, it has all the advantages of the ejector device described above.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 embodiments of the present invention.

Claims

1. An ejector device, characterized in that: include: An ejector assembly (100) is provided with an ejected medium inlet (121) and a mixed medium outlet (131), the ejector assembly (100) is internally structured with at least two ejection flow channels, each of the ejection flow channels is respectively connected to the ejected medium inlet (121) and the mixed medium outlet (131), and the flow area of ​​one of the ejection flow channels is smaller than the flow area of ​​the other ejection flow channels; The valve body (200) is arranged on the other injection flow channels, and the valve body (200) blocks or opens the corresponding injection flow channel under the action of air pressure.

2. The ejector device according to claim 1, characterized in that The valve body (200) comprises a sealing portion (210) and a sliding portion (220) connected to each other; The sliding portion (220) is slidably matched with the inner wall of the ejection channel; When the valve body (200) blocks the ejection channel, the sealing portion (210) is suitable for sealingly cooperating with the inner wall of the ejection channel; when the valve body (200) opens the ejection channel, the sealing portion (210) is suitable for forming a flow gap with the inner wall of the ejection channel.

3. The ejector device according to claim 2, characterized in that: The sealing portion (210) is provided with a flow hole (211), and a first flow channel (212) connected to the flow hole (211) is provided inside the sealing portion (210); and a second flow channel (221) connected to the first flow channel (212) is provided inside the sliding portion (220); When the valve body (200) opens the ejection channel, the flow gap is connected to the first channel (212) through the flow hole (211).

4. The ejector device according to claim 2, characterized in that: The valve body (200) further comprises a sealing member (230), wherein the sealing member (230) is sleeved on the outer surface of the sealing portion (210).

5. The ejector device according to claim 4, characterized in that The outer surface of the valve body (200) is provided with a sealing groove (213), and the sealing member (230) is embedded in the sealing groove (213).

6. The ejector device according to any one of claims 2 to 5, characterized in that: Each of the ejection flow channels comprises a contraction section (113), a mixing section (114) and a diffusion section (115) which are interconnected; The sealing portion (210) and the sliding portion (220) are both arranged at the corresponding diffuser section (115) of the ejector channel.

7. The ejector device according to claim 6, characterized in that The diffuser section (115) comprises a first sub-diffuser section (1151), a second sub-diffuser section (1152) and a flow section (1153) which are connected in sequence, the angle of the second sub-diffuser section (1152) is greater than the angle of the first sub-diffuser section (1151), and the length of the second sub-diffuser section (1152) is less than the length of the first sub-diffuser section (1151); The sliding portion (220) is slidably matched with the inner wall of the flow section (1153); When the valve body (200) blocks the ejector channel, the sealing portion (210) is in sealing cooperation with the inner wall of the first sub-diffuser section (1151).

8. The ejector device according to claim 7, characterized in that The diffuser section (115) further comprises a sealing section (1154), wherein the sealing section (1154) is located between the first sub-diffuser section (1151) and the second sub-diffuser section (1152); When the valve body (200) blocks the ejection channel, the sealing portion (210) is in sealing cooperation with the inner wall of the sealing section (1154).

9. The ejector device according to any one of claims 1 to 5, characterized in that: The flow area of ​​the ejection channel is positively correlated with the flow resistance of the corresponding ejection channel.

10. The ejector device according to any one of claims 1 to 5, characterized in that: The ejector assembly (100) comprises an ejector body (110), a first cover body (120) and a second cover body (130), wherein the first cover body (120) and the second cover body (130) are respectively detachably connected to the ejector body (110); The drained medium inlet (121) is arranged on the first cover body (120), and the mixed medium outlet (131) is arranged on the second cover body (130); at least two of the ejection channels are arranged inside the ejector body (110).

11. The ejector device according to any one of claims 1 to 5, characterized in that: It also includes a base (300), and the ejector assembly (100) is arranged on the base (300); The base (300) is provided with nozzles (310) corresponding one-to-one to the positions of at least two of the injection flow channels, and the nozzles (310) are connected to the corresponding injection flow channels.

12. A fuel cell, characterized in that: An ejector device comprising any one of claims 1 to 11.

Images