Noise reduction structure of ejector, ejector and fuel cell system
By setting a silencing cavity outside the ejector main housing and dividing it into multiple sub-cavities, and combining different channel flow cross-sectional areas, the problem of low-frequency noise in the ejector is solved, achieving a wide-band noise reduction and cost-controllable silencing effect.
Patent Information
- Application Number
- CN202520228599.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-13
AI Technical Summary
Existing technologies are insufficient to effectively reduce ejector noise, especially low-to-mid frequency noise in the 300-2300Hz range, and existing encapsulation materials are costly and may interfere with surrounding components.
An outer shell is set outside the main shell of the ejector to form a sealed silencing cavity. A channel is set on the main shell, and a partition is set inside the silencing cavity to divide it into multiple sub-cavities. Each sub-cavity has a different volume, and the flow cross-sectional area of the channel is also different, so as to carry out targeted noise reduction for noise of different frequencies.
It effectively reduces ejector noise, adapts to a wider noise frequency range, reduces costs, avoids material interference, and improves the ejector's drainage performance and sealing.
Smart Images
Figure CN223739742U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to ejector manufacturing technical field, especially ejector silencing structure, in addition, the utility model relates to a kind of ejector and fuel cell system. BACKGROUND
[0002] Hydrogen fuel cell system is a kind of power generation device by hydrogen and oxygen electrochemical reaction. Hydrogen that is not completely reacted in fuel cell system, usually will be reabsorbed into the reaction of electric pile by ejector, hydrogen pump or the combination of hydrogen pump and ejector.
[0003] In the ejector, high pressure primary flow gas can reabsorb hydrogen (ejection flow gas) that is not reacted by the flow channel structure of ejector, two fluids are mixed and then discharged by ejector, to supply electric pile. In the flow channel structure of ejector, high flow gas is formed at narrow nozzle, negative pressure is formed in suction chamber, so that the gas of ejection flow is absorbed into flow channel.
[0004] When primary flow gas is ejected from ejector nozzle, high flow rate gas is generated, which is close to or exceeds the speed of sound propagation in hydrogen (1400m / s). The high flow rate gas ejected from nozzle will generate a lot of noise, which is radiated outward through the body of ejector and the flow channel downstream of ejector, thereby generating a larger airflow noise outside the ejector.
[0005] The frequency range of noise radiated by ejector is mainly concentrated in the range of 300Hz-2300Hz. These noises are also the main noise source of hydrogen pipeline of fuel cell system, which adversely affects the improvement of noise level of fuel cell system. To reduce these noises, the existing common means is to wrap the components that radiate noise outward, but the wrapping means can only effectively reduce the higher frequency noise above 2300Hz, and the silencing effect for the middle and low frequency noise of 300-2300Hz is not ideal. In addition, the wrapping effect is also related to the amount of material used, and too much material used may interfere with the surrounding components and increase the cost. SUMMARY
[0006] Therefore, the utility model aims at providing an ejector silencing structure to provide a silencing means that can effectively improve the noise of ejector.
[0007] To achieve the above purpose, the technical scheme of the utility model is as follows:
[0008] An ejector silencing structure includes a main housing with a through flow channel inside, and an outer housing sleeved outside the main housing. A closed silencing cavity is formed between the outer housing and the main housing, and a passage is provided on the main housing to communicate the silencing cavity and the flow channel.
[0009] Further, the sound attenuation cavity is provided with a partition plate, the sound attenuation cavity is divided into a plurality of sub-cavities by the partition plate, and the sub-cavities are arranged in sequence along the airflow direction in the flow channel.
[0010] Further, the volumes of the sub-cavities are different, and / or the flow passage cross-sectional areas of the passages are different.
[0011] Further, the main shell comprises an air inlet section, a mixing section and an air outlet section which are connected in sequence along the airflow direction, and the sub-cavities comprise a first sound attenuation cavity arranged corresponding to the air inlet section, a second sound attenuation cavity arranged corresponding to the mixing section, and a third sound attenuation cavity arranged corresponding to the air outlet section.
[0012] Further, the mixing section is configured as a horn shape with a gradually increasing radial dimension in the airflow direction, the air inlet section and the air outlet section are both configured as a pipe shape, the radial dimension of the air inlet section is consistent with the air inlet end of the mixing section, and the radial dimension of the air outlet section is consistent with the air outlet end of the mixing section.
[0013] Further, the passages located on the air inlet section are a plurality of first through holes distributed on the same cross section of the air inlet section, and the passages located on the mixing section are a plurality of second through holes distributed on the same cross section of the mixing section.
[0014] Further, the passages located on the air outlet section are a plurality of third through holes or a plurality of communication slits distributed on the same cross section of the air outlet section.
[0015] Compared with the prior art, the utility model has the following advantages:
[0016] The ejector sound attenuation structure of the utility model, through setting the outer shell outside the main shell, forming the closed sound attenuation cavity between the outer shell and the main shell, and utilizing the passages opened on the main shell, the airflow flowing at high speed in the flow channel inside the main shell can diffuse and transmit part of energy to the sound attenuation cavity, so as to reduce the noise generated by the high-speed airflow, thereby providing a sound attenuation means which can effectively improve the noise condition of the ejector.
[0017] In addition, the partition plate is arranged in the sound attenuation cavity, so that the sound attenuation cavity is divided into a plurality of sub-cavities, different volumes of sub-cavities can be arranged according to the noise frequency generated by the airflow in different flow sections of the flow channel, different volumes of sub-cavities have targeted noise reduction effect on different frequency noises, so that the whole ejector sound attenuation structure can cope with a larger noise frequency range.
[0018] Another purpose of the utility model is to provide an ejector, the ejector is provided with the ejector sound attenuation structure of the utility model.
[0019] Further, the gas inlet end of the main casing is provided with a nozzle connecting seat outside the outer casing, and the gas outlet end of the main casing is provided with a gas outlet connector outside the outer casing; a radiation cavity in communication with the flow channel is formed in the nozzle connecting seat, the nozzle connecting seat is provided with a nozzle insertion port on the side opposite to the main casing, and the nozzle connecting seat is provided with a drainage connector in communication with the radiation cavity; the outer circumferential surface of the gas outlet connector and the drainage connector is provided with a ring-shaped sealing protrusion.
[0020] The ejector has the technical advantages of the ejector silencing structure described above. Further, the nozzle connecting seat is arranged at the gas inlet end of the main casing, so that the nozzle insertion port for inserting the nozzle is easily arranged on the nozzle connecting seat, and the drainage connector for inserting the drainage pipeline is easily arranged on the nozzle connecting seat; the gas outlet connector is arranged at the gas outlet end of the main casing, so that the intake pipeline of the stack is easily inserted into the gas outlet connector, and the airflow discharged by the ejector can smoothly pass through the intake pipeline and enter the stack. The first sealing protrusion is arranged on the drainage connector, and the second sealing protrusion is arranged on the gas outlet connector, so that good sealing is formed between the drainage pipeline and the drainage connector, and between the gas outlet connector and the intake pipeline, thereby preventing the pipeline system from leaking.
[0021] The utility model discloses still propose a kind of fuel cell system, the fuel cell system in which is the ejector described in the utility model.The fuel cell system of the utility model has the technical advantages of the above-mentioned ejector silencing structure or ejector. BRIEF DESCRIPTION OF DRAWINGS
[0022] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and the front and rear, up and down and other orientation words involved are only used to show relative position relationship, and all do not constitute undue limitation to the utility model.In the drawings:
[0023] Figure 1 It is the cross-sectional structure schematic view of the ejector silencing structure and the ejector of the utility model embodiment described in the utility model embodiment;
[0024] Figure 2 It is the cross-sectional structure schematic view of the ejector silencing structure and the ejector of another structure form of the utility model embodiment described in the utility model embodiment;
[0025] Figure 3 It is the sound attenuation performance characteristic curve diagram of the ejector described in the utility model embodiment;
[0026] Figure 4 It is the system composition schematic view of the fuel cell system described in the utility model embodiment.
[0027] Reference signs:
[0028] 1, outer shell; 11, first partition plate; 12, second partition plate;
[0029] 2, main shell; 20, nozzle connecting seat; 200, incident cavity; 201, flow guide connector; 202, first sealing protrusion; 21, air inlet section; 22, mixing section; 23, air outlet section; 230, air outlet connector; 231, second sealing protrusion;
[0030] 3, flow channel; 301, first through hole; 302, second through hole; 303, third through hole; 31, communication slit;
[0031] 41, first sound attenuation cavity; 42, second sound attenuation cavity; 43, third sound attenuation cavity;
[0032] 5, nozzle; 50, injection port; 51, sealing groove; 6, ejector;
[0033] 7, electric pile; 70, air inlet pipeline; 71, exhaust pipeline;
[0034] 8, heat exchanger; 80, air supply pipeline; 81, flow control valve;
[0035] 9, water-gas separation device; 90, water outlet; 91, flow guide pipeline; 92, exhaust port. DETAILED DESCRIPTION
[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0037] In the description of the present application, it should be stated that if the terms such as "up, down, left, right, front, back, inside and outside" indicating the orientation or positional relationship appear, it is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device or element must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0038] Moreover, in the description of the present application, unless otherwise explicitly defined, the terms "mounting", "connecting", "connection", "connector" should be interpreted broadly. For example, the connection can be fixed connection, or detachable connection, or integrally connected; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate media, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances. In the description of the present application, the limiting terms "first, second, A, B, C, D" and the like appear, which are only used to distinguish different positions, attributions or purposes of similar features, to avoid ambiguity and confusion in the description, and cannot be understood as indicating or implying relative importance.
[0039] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.
[0040] Embodiment one
[0041] The present embodiment relates to an ejector noise reduction structure, which provides a noise reduction means that can effectively improve the noise condition of the ejector. An exemplary structure is shown in Figure 1 or Figure 2 .
[0042] Overall, the ejector noise reduction structure includes a main housing 2 having a through-flow passage 3 inside, and an outer housing 1 sleeved outside the main housing 2. The outer housing 1 and the main housing 2 form a closed noise reduction cavity therebetween, and a passage is provided on the main housing 2 for communicating the noise reduction cavity and the flow passage 3.
[0043] It should be noted that based on the overall design idea described above, the technical scheme of the present application can adopt various different specific implementation structures, forms or configuration sequences. For example, the structure shape of the main housing 2, the outer housing 1 and the like described above can be a regular cylindrical shape, or other shapes that can allow airflow to flow in a predetermined direction, such as a square tube shape, etc.; the specific arrangement sequence, assembly method and the like of the main housing 2, the outer housing 1 and the passage on the main housing 2 can also be flexibly adjusted; for example, the outer housing 1 can be directly welded to the main housing 2, or clamped and fixed to the outside of the main housing 2 by a sealing gasket or the like. In actual implementation, those skilled in the art can make flexible adjustments and improvements in combination with actual circumstances. Obviously, various combinations of the above specific forms and their changes can form many schemes, and the specific implementation scheme of the present embodiment is within the protection scope of the present application.
[0044] Specifically, in the embodiment, a partition plate can be arranged in the sound attenuation cavity, so that the sound attenuation cavity is divided into multiple sub-cavities by the partition plate, and the sub-cavities are arranged in sequence along the direction of the airflow in the flow channel 3; and a plurality of passages are arranged on the main shell 2 corresponding to the sub-cavities. Arranging the partition plate in the sound attenuation cavity so as to divide the sound attenuation cavity into multiple sub-cavities can set sub-cavities with different volumes according to the noise frequency generated by the airflow in different flow sections of the flow channel 3; the sub-cavities with different volumes have targeted noise reduction effects on different frequencies of noise, so that the sound attenuation structure of the ejector can cope with a larger range of noise frequencies.
[0045] Of course, the sub-cavities can have a unified size and shape, so that the internal volumes are consistent; or different volumes can be arranged; and the passages corresponding to the sub-cavities can have the same size or different cross-sectional sizes. In the embodiment, the volumes of the sub-cavities are different, and the flow passage cross-sectional areas of the passages corresponding to the sub-cavities are also different. The flow passage cross-sectional area of the passage between the flow channel 3 and the sound attenuation cavity will affect the gas flux, and changing the flow passage cross-sectional area of the passage can also adjust the noise frequency that the sound attenuation cavity is suitable for reducing; by arranging sub-cavities with different volumes or adapting the passages corresponding to the sub-cavities to have different flow passage cross-sectional areas, the ability of the sub-cavities to cope with noise in different frequency bands can be further improved.
[0046] As already pointed out above, the partition plate can be arranged in the sound attenuation cavity, and the number of partition plates arranged can be flexibly selected; therefore, the sound attenuation cavity of the ejector of the utility model can be a single-cavity structure, a two-cavity or three-cavity structure, or a more sub-cavity structure. In the embodiment, as shown in Figure 1 the main shell 2 includes an inlet section 21, a mixing section 22 and an outlet section 23 connected in sequence along the direction of the airflow; accordingly, the partition plate of the embodiment is two, namely a first partition plate 11 and a second partition plate 12, so as to divide the sound attenuation cavity into three sub-cavities, namely a first sound attenuation cavity 41 arranged corresponding to the inlet section 21, a second sound attenuation cavity 42 arranged corresponding to the mixing section 22, and a third sound attenuation cavity 43 arranged corresponding to the outlet section 23. Arranging the main shell 2 into the inlet section 21, the mixing section 22 and the outlet section 23, the high-speed primary flow gas injected into the incident cavity 200 of the ejector 6 by the nozzle 5 of the ejector 6 and the ejector flow gas introduced into the incident cavity 200 by the flow guide pipeline 91 will enter the flow channel 3 inside the inlet section 21 together, then reach the flow channel 3 inside the mixing section 22 and mix fully, and then pass through the flow channel 3 inside the outlet section 23 to be discharged from the ejector 6; the flow guiding performance of the ejector 6 can be fully improved. Corresponding to the three flow sections of the flow channel 3 formed corresponding to the above-mentioned inlet section 21, mixing section 22 and outlet section 23, three sub-cavities are arranged, so that the sound attenuation performance of each sub-cavity is more targeted in adapting to noise in different frequency bands, thereby improving the overall sound attenuation effect of the sound attenuation cavity.
[0047] Based on the above setting, preferably, the mixing section 22 is configured as a horn shape with gradually increasing radial dimension in the direction of the gas flow; the gas inlet section 21 and the gas outlet section 23 are both configured as a tube shape; the radial dimension of the gas inlet section 21 is consistent with that of the gas inlet end of the mixing section 22, and the radial dimension of the gas outlet section 23 is consistent with that of the gas outlet end of the mixing section 22. Designing the mixing section 22 as a horn shape can effectively improve the mixing effect of the mixing section 22; at the same time, the flow passage 3 inside the mixing section 22 has gradually increasing flow area, thereby forming a relatively negative pressure downstream of the flow passage 3, which can further improve the flow speed of the gas flow inside the gas inlet section 21, which helps to further improve the flow guiding effect of the ejector 6.
[0048] For the setting of the passages, of course, there are many different structural schemes to choose from. In the present embodiment, as shown in Figure 1 and Figure 2 , the passages on the gas inlet section 21 are a plurality of first through holes 301 distributed on the same cross section of the gas inlet section 21, and the passages on the mixing section 22 are a plurality of second through holes 302 distributed on the same cross section of the mixing section 22. The passages on the gas inlet section 21 and the mixing section 22 are in the form of through holes, which is convenient for processing and construction, and by setting different numbers of through holes, the flow area of the passages of the same sub-cavity can be flexibly adjusted. By arranging the through holes corresponding to the same sub-cavity on the same cross section (i.e. the plane perpendicular to the direction of the gas flow) of the main housing 2, the high-speed gas flow in the flow passage 3 can be prevented from entering the sound attenuation cavity through the upstream through hole and then flowing back to the flow passage 3 through the downstream through hole, thereby causing turbulent flow of the gas flow in the sound attenuation cavity, which affects the sound attenuation effect of the sound attenuation cavity; at the same time, it can also prevent the backflow of the gas flow in the sound attenuation cavity from causing a decrease in the flow guiding capacity of the ejector 6.
[0049] The passages on the gas outlet section 23 can adopt any of the following schemes. One is to design the passages on this section as a single communication slit 31 (as shown in Figure 1 ) distributed on the same cross section of the gas outlet section 23, and the entire communication slit 31 completely divides the gas outlet section 23 into two sections along the circumference of the gas outlet section 23, thereby maximizing the flow area of the passages; the connection and fixation between the two sections of the gas outlet section 23 are realized by the outer housing 1 and the second partition plate 12. Two is to set a plurality of communication slits 31 on the same cross section of the gas outlet section 23, and leave a connecting rib between two adjacent communication slits 31 to realize the connection between the gas outlet sections 23 on both sides of the communication slit 31. Three is to design the passages as a plurality of third through holes 303 (as shown in Figure 2In the case of a large number of through holes required for the sub-chambers, the large number of and dispersed through holes, which are required to be arranged on the same cross section of the main housing 2, will affect the smoothness of the airflow in the flow channel 3 and are not conducive to processing; the passage with the communication slit 31 can efficiently increase the flow area of the passage of the sub-chamber and is convenient for processing and construction.
[0050] As can be seen from the above overall arrangement, by arranging a plurality of sub-chambers with different volumes, the appropriate sub-chamber volume can be arranged according to the noise frequency generated by the airflow in different flow sections of the flow channel 3, so as to produce targeted noise reduction effect for different frequency noises. Moreover, the passages of different sub-chambers adopt various forms of through holes or communication slits 31, and the flow area of the passage of each sub-chamber can be flexibly changed by adjusting the size and number of the through holes or adjusting the length and width of the communication slit 31. Under the condition of the same chamber volume, the greater the flow area of the passage, the higher the noise frequency to be reduced. Therefore, the volume of the sub-chamber and the flow area of the passage thereof can be flexibly arranged according to the requirement of the noise reduction frequency, so as to ensure that the ejector has noise reduction performance in a large frequency range.
[0051] In summary, the noise reduction structure of the ejector of the present embodiment provides a noise reduction means which can effectively improve the noise of the ejector 6 by arranging the outer housing 1 outside the main housing 2 to form a closed noise reduction chamber between the outer housing 1 and the main housing 2, and using the passage arranged on the main housing 2 to make the high-speed airflow in the flow channel 3 inside the main housing 2 diffuse and transmit part of the energy to the noise reduction chamber to reduce the noise generated by the high-speed airflow.
[0052] Embodiment Two
[0053] The present embodiment relates to an ejector provided with the noise reduction structure of the ejector as provided in embodiment one; an exemplary structure thereof is shown in Figure 1 or Figure 2 .
[0054] Specifically, the gas inlet end of the main housing 2 is provided with a nozzle connecting seat 20 outside the outer housing 1, and the gas outlet end of the main housing 2 is provided with a gas outlet connector 230 outside the outer housing 1. Among them, the nozzle connecting seat 20 is formed with an incident cavity 200 communicated with the flow channel 3, the incident cavity 200 is provided with a nozzle insertion port on the side of the nozzle connecting seat 20 facing away from the main housing 2, and the nozzle 5 is inserted into the nozzle insertion port, the jet port 50 of the nozzle 5 is located at the middle position of the incident cavity 200, and the high-speed primary flow gas can be sprayed into the incident cavity 200 and then into the flow channel 3. The sealing groove 51 can be formed on the peripheral surface of the nozzle 5, and the sealing ring is arranged in the sealing groove 51, so as to ensure the sealing between the nozzle 5 and the nozzle connecting seat 20. At the same time, the nozzle connecting seat 20 is also provided with a flow guide connector 201 communicated with the incident cavity 200, and the flow guide pipeline 91 for providing the induced flow gas can be inserted into the flow guide connector 201, so as to supply the induced flow gas into the incident cavity 200.
[0055] At this point, a complete ejector 6 with good sound attenuation effect is formed. Figure 1 or Figure 2 As shown by the arrows marked in the figure, the primary flow gas from the hydrogen supply pipeline 80 enters the incident cavity 200 in the direction of arrow a, and the induced flow gas from the flow guide pipeline 91 enters the incident cavity 200 in the direction of arrow b, and the two gas flows are mixed in the flow channel 3 and then discharged from the ejector 6 in the direction of arrow c.
[0056] In addition, annular sealing protrusions can be arranged on the peripheral surfaces of the gas outlet connector 230 and the flow guide connector 201. By arranging the nozzle connecting seat 20 at the gas inlet end of the main housing 2, it is convenient to arrange the nozzle insertion port for inserting the nozzle 5 on the nozzle connecting seat 20, and it is also convenient to arrange the flow guide connector 201 for inserting the flow guide pipeline 91 on the nozzle connecting seat 20; by arranging the gas outlet connector 230 at the gas outlet end of the main housing 2, it is convenient to insert the gas inlet pipeline 70 of the stack 7 into the gas outlet connector 230, so that the gas flow discharged from the ejector 6 can smoothly enter the stack 7 through the gas inlet pipeline 70. By arranging the first sealing protrusion 202 on the flow guide connector 201 and the second sealing protrusion 231 on the gas outlet connector 230, good sealing can be formed between the flow guide pipeline 91 and the flow guide connector 201, and between the gas outlet connector 230 and the gas inlet pipeline 70, so as to prevent the pipeline system from leaking.
[0057] It can be seen that the ejector 6 integrates the sound elimination structure in the inside, has the technical points of compact design and controllable cost, and has the advantages of high durability, compact structure and low manufacturing cost, and the sound elimination performance is more practical, and the sound elimination ability of wide frequency, adjustment and high sound elimination can be provided.
[0058] In the ejector sound elimination structure of the present application, a plurality of cavities with different volumes are arranged, and channels with different flow cross-sectional areas are arranged correspondingly, so that the sound elimination capacity of the ejector 6 can be verified by transmission loss simulation or transmission loss test, and the volume of the cavity and the flow cross-sectional area of the channel are adjusted according to the required sound elimination frequency range. Figure 3 As shown in the simulation results, the two sets of noise transmission loss curves generated by the simulation results shown in the figure can be seen, because the cavities with different volumes and the channels with different flow cross-sectional areas are adopted, the noise frequencies corresponding to the transmission loss curve A and the transmission loss curve B are different, and different noise reduction effects can be achieved in different frequency bands, so that the sound elimination capacity of the ejector 6 can be adjusted. The sound power level difference between the upstream pipe noise and the downstream pipe noise in the figure is used to reflect the transmission loss of the noise. The higher the transmission loss curve, the stronger the sound elimination capacity.
[0059] Overall, the ejector 6 of the present application has the advantages of good durability, compact structure, low manufacturing cost, and the sound elimination performance is more practical, and can provide wide frequency, adjustable, high sound elimination sound elimination capacity.
[0060] Example three
[0061] This embodiment relates to a fuel cell system, which is provided with the ejector provided in example two; an exemplary structure of the system is shown in Figure 4 .
[0062] The hydrogen stream supplied by the hydrogen supply unit is treated by the heat exchanger 8, and then reaches the ejector 6 through the supply pipeline 80, and is sprayed into the incident chamber 200 through the nozzle 5 of the ejector 6. The tail gas of the stack 7 is discharged through the exhaust pipeline 71 into the water-gas separation device 9, and under the water-gas separation effect of the water-gas separation device 9, the condensed water is discharged from the water outlet 90, and the residual hydrogen is supplied into the ejector 6 through the drainage pipeline 91, and the waste gas such as nitrogen is discharged from the exhaust port 92. The primary flow gas from the supply pipeline 80 sucks the ejector flow gas from the drainage pipeline 91 into the ejector 6, and the two streams are mixed in the flow channel 3 and then supplied to the stack 7 through the intake pipeline 70.
[0063] The heat exchanger 8 can heat the entering hydrogen, and the flow control valve 81 can be arranged on the supply pipeline 80 to control the amount of entering hydrogen.
[0064] The above is only the preferred embodiment of the present application, and the detailed configuration explanation, specific structure setting form example, or assembly connection mode expression, etc. are all for the need of full disclosure, so as to better implement the present application for the technical personnel in the field, and not to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An ejector silencing structure, characterized in that: a main casing (2) with a through flow channel (3) inside, and an outer casing (1) sleeved outside the main casing (2); a closed silencing cavity is formed between the outer casing (1) and the main casing (2), and the main casing (2) is provided with passages for connecting the silencing cavity and the flow channel (3).
2. The ejector silencing structure according to claim 1, characterized in that: a partition is arranged in the silencing cavity, which divides the silencing cavity into multiple sub-cavities, and the sub-cavities are arranged in sequence along the direction of the gas flow in the flow channel (3); and multiple passages are arranged on the main casing (2) corresponding to the sub-cavities.
3. The ejector silencing structure according to claim 2, characterized in that: the volumes of the sub-cavities are different, and / or the flow cross-sectional areas of the passages are different.
4. The ejector silencing structure according to claim 2 or 3, characterized in that: the main casing (2) comprises an inlet section (21), a mixing section (22) and an outlet section (23) connected in sequence along the direction of the gas flow, and the sub-cavities comprise a first silencing cavity (41) arranged corresponding to the inlet section (21), a second silencing cavity (42) arranged corresponding to the mixing section (22), and a third silencing cavity (43) arranged corresponding to the outlet section (23).
5. The ejector silencing structure according to claim 4, characterized in that: the mixing section (22) is configured in a horn shape with the radial dimension gradually increasing in the direction of the gas flow; the inlet section (21) and the outlet section (23) are both configured in a tubular shape; the radial dimension of the inlet section (21) is consistent with the inlet end of the mixing section (22), and the radial dimension of the outlet section (23) is consistent with the outlet end of the mixing section (22).
6. The ejector silencing structure according to claim 4, characterized in that: the passages on the inlet section (21) are a plurality of first through holes (301) distributed on the same cross section of the inlet section (21), and the passages on the mixing section (22) are a plurality of second through holes (302) distributed on the same cross section of the mixing section (22).
7. The ejector silencing structure according to claim 4, characterized in that: the passages on the outlet section (23) are a plurality of third through holes (303) or a plurality of communication slits (31) distributed on the same cross section of the outlet section (23).
8. An ejector, characterized in that: the ejector is provided with the ejector silencing structure according to any one of claims 1 to 7.
9. The ejector according to claim 8, characterized in that: the inlet end of the main casing (2) is provided with a nozzle connecting seat (20) outside the outer casing (1), and the outlet end of the main casing (2) is provided with an outlet joint (230) outside the outer casing (1). The nozzle connecting seat (20) is formed with an incident cavity (200) communicated with the flow channel (3), the incident cavity (200) is provided with a nozzle insertion port on the side of the nozzle connecting seat (20) facing away from the main shell (2), and the nozzle connecting seat (20) is provided with a flow guide connector (201) communicated with the incident cavity (200); The outer circumferential surface of the gas outlet connector (230) and the flow guide connector (201) is provided with a ring-shaped sealing protrusion.
10. A fuel cell system, characterized in that: The fuel cell system is provided with the ejector according to any one of claims 8 and 9.