Exhaust silencer for hydrogen fuel cell automobile

Abstract

The utility model discloses an exhaust silencer for a hydrogen fuel cell automobile, which comprises a shell, a gas inlet, a gas outlet, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe and a gas outlet pipe, a water outlet communicated with the cavity is further formed in one end, close to the air outlet, of the bottom of the shell; the water vapor separation membrane partition plate is arranged in the cavity close to one side of the air inlet; the inner core is arranged in the cavity and is provided with a through channel; the tail part of the channel is communicated with the air outlet; wherein gaps are formed between the bottom of the water vapor separation membrane partition plate and the inner bottom of the shell and between the bottom of the inner core and the inner bottom of the shell, and the gaps are communicated with a water drainage opening to form a water drainage groove. By means of the scheme, the low resistance is achieved, meanwhile, the exhaust noise is eliminated, the drainage and water storage requirements are met, and the low resistance exhaust valve is suitable for a hydrogen fuel cell automobile adopting a turbo-expander.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen fuel cell vehicles, and more specifically, to an exhaust muffler for a hydrogen fuel cell vehicle. Background Art

[0002] Currently, the application of hydrogen fuel cell vehicles in the commercial vehicle field has initially shown scale effects, and major vehicle manufacturers in the passenger vehicle field are competing to carry out research and development. As a very important component of the hydrogen fuel cell system, the air compressor is used to maintain the pressure inside the fuel cell stack to achieve an ideal efficiency output. As an important technology for the next-generation hydrogen fuel cell air supercharger, the expander has been recognized by the market. It can better recover the kinetic energy of the air discharged from the fuel cell stack, achieving the effect of improving energy utilization. Its working principle is similar to that of the turbocharger used in current fuel vehicles.

[0003] Due to its internal structure design, the exhaust muffler of traditional fuel vehicles has many bends in the air flow direction and has a large resistance. If a hydrogen fuel cell vehicle uses the exhaust muffler of a fuel vehicle, first, the air flow resistance will be further increased, resulting in an increase in the back pressure at the outlet end of the expander, which is not conducive to the energy recovery and utilization of the air discharged from the fuel cell stack by the expander. Second, it cannot or is difficult to meet the drainage and water storage requirements of hydrogen fuel cell vehicles. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an exhaust muffler for a hydrogen fuel cell vehicle, which has low resistance, while achieving the elimination of exhaust noise and meeting the drainage and water storage requirements.

[0005] The embodiments of the utility model are realized through the following technical solutions:

[0006] An exhaust muffler for a hydrogen fuel cell vehicle, comprising:

[0007] A housing having a cavity, and an air inlet and an air outlet communicating with the cavity are respectively provided on two opposite sides thereof; a drain port communicating with the cavity is further provided at one end of the bottom of the housing close to the air outlet;

[0008] A water vapor separation membrane partition is arranged in the cavity on the side close to the air inlet;

[0009] An inner core is arranged in the cavity and has a through channel; the tail of the channel communicates with the air outlet;

[0010] Wherein, there are gaps between the bottom of the water vapor separation membrane partition and the bottom of the inner core and the inner bottom of the housing, and the gaps communicate with the drain port to form a drainage groove.

[0011] In an embodiment of the present utility model, the inner core divides the upper part of the cavity into several first chambers and the lower part of the cavity into several second chambers; the channel is provided with several first sound-absorbing holes respectively communicating with the first chambers and several second sound-absorbing holes respectively communicating with the second chambers;

[0012] Sound-absorbing cotton is filled in several of the first chambers respectively.

[0013] In an embodiment of the present utility model, water-proof meshes are respectively arranged at several of the first sound-absorbing holes.

[0014] In an embodiment of the present utility model, it further includes a flow guiding plate, which is arranged in the cavity and located between the water vapor separation membrane partition and the air inlet.

[0015] In an embodiment of the present utility model, the water vapor separation membrane partition includes:

[0016] A frame, which is inclined and arranged in the cavity; the frame has an installation groove;

[0017] A water vapor separation membrane body, which is arranged in the installation groove.

[0018] In an embodiment of the present utility model, it further includes a drain valve, which is arranged at the drain port.

[0019] In an embodiment of the present utility model, a protrusion is provided at the inner bottom of one side of the housing close to the drain port.

[0020] In an embodiment of the present utility model, one end of the channel close to the water vapor separation membrane partition has a rounded corner.

[0021] In an embodiment of the present utility model, the air inlet, the air outlet and the channel are located on the same axis.

[0022] The technical solution of the embodiment of the present utility model has at least the following advantages and beneficial effects:

[0023] For the exhaust muffler of the hydrogen fuel cell vehicle of the present utility model, when water vapor enters from the air inlet and passes through the water vapor separation membrane partition, gas-liquid separation is completed, and the air flow continues to discharge from the housing along the direction of the channel - air outlet, and the inner core plays a role in noise reduction; the liquid falls into the drain tank and is discharged through the drain port under the blowing of the air flow; through the above scheme, the present utility model has low resistance, and at the same time achieves the elimination of exhaust noise and meets the requirements of drainage and water storage, and is applicable to hydrogen fuel cell vehicles using a turboexpander. Description of the Drawings

[0024] Figure 1 It is a structural schematic diagram of the present utility model;

[0025] Figure 2 It is a sectional view of the present utility model;

[0026] Figure 3 It is a schematic structural view of the inner core;

[0027] Figure 4 It is a schematic plan view of the inner core;

[0028] Figure 5 is Figure 4 a sectional view of the A-A plane in

[0029] Figure 6 a schematic structural view of the drain valve.

[0030] Icon: 1 - housing, 11 - protrusion, 1a - air inlet, 1b - air outlet, 1c - drain outlet, 1d - first chamber, 1e - second chamber, 1f - drain groove, 2 - moisture separation membrane partition, 21 - frame, 22 - moisture separation membrane body, 3 - inner core, 3a - channel, 3b - first sound absorption hole, 3c - second sound absorption hole, 4 - sound absorption cotton, 5 - flow guide plate, 6 - drain valve, 7 - water isolation net. Specific embodiments

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] It should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. They are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "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, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise clearly specifically defined.

[0036] Please refer to Figures 1 - 5 , a hydrogen fuel cell vehicle exhaust muffler, which includes a housing 1, a water vapor separation membrane partition 2, an inner core 3, a flow guide plate 5, a drain valve 6, and a plurality of sound-absorbing cotton 4.

[0037] As Figures 1 - 2 shown, the housing 1 has a cuboid structure, and its interior has a cavity. Opposite sides of the housing 1 in the length direction are respectively provided with an air inlet 1a and an air outlet 1b communicating with the cavity; one end of the bottom of the housing 1 close to the air outlet 1b is also provided with a drain port 1c communicating with the cavity.

[0038] In this embodiment, in order to facilitate the installation of the water vapor separation membrane partition 2 and the inner core 3, the housing 1 is composed of an upper housing 1 and a lower housing 1.

[0039] As Figure 2As shown, the water vapor separation membrane partition 2 includes a frame 21 and a water vapor separation membrane body 22. The frame 21 has a mounting groove and is disposed in the cavity near the side of the air inlet 1a. The water vapor separation membrane body 22 is disposed in the mounting groove. When water vapor passes through the water vapor separation membrane body 22, the gas-liquid separation is completed. The air flow smoothly passes through the water vapor separation membrane body 22, while the liquid is blocked by the water vapor separation membrane body 22 and drips into the housing 1. At the same time, since the water vapor separation membrane body 22 is inclined, firstly, the utilization area of the water vapor separation membrane body 22 is increased, and secondly, it is convenient for the air flow to blow off the liquid attached to the water vapor separation membrane body 22.

[0040] In this embodiment, the water vapor separation membrane body 22 is composed of a separation membrane body and a plastic frame. The plastic frame and the separation membrane body are integrally formed and mounted on the frame 21.

[0041] As Figure 2 shown, the deflector 5 is disposed in the cavity and is located between the water vapor separation membrane partition 2 and the air inlet 1a. The deflector 5 is in a V shape. When water vapor enters from the air inlet 1a, it passes through the deflector 5. Under the action of the deflector 5, the water vapor is separated, avoiding the concentrated contact of the water vapor on the water vapor separation membrane body 22 and increasing the utilization area of the water vapor separation membrane body 22.

[0042] As Figures 3 - 6 shown, the inner core 3 is disposed in the cavity and is located behind the water vapor separation membrane partition 2. A channel 3a penetrating in the horizontal direction is provided in the middle of the inner core 3. The inner core 3 has a number of longitudinally and transversely arranged partitions, thereby dividing the upper part of the cavity into a number of first chambers 1d and the lower part of the cavity into a number of second chambers 1e. A number of first sound absorption holes 3b communicating with the first chambers 1d and second sound absorption holes 3c communicating with the second chambers 1e are also provided on the channel 3a. Sound absorption cotton 4 is filled in a number of the first chambers 1d respectively. The air flow that has completed the gas-liquid separation enters the inner core 3. A number of lower chambers form a resistance sound absorption unit, and sound energy reflection and interference occur in the lower chambers during the sound propagation process, thereby reducing the outwardly radiated sound energy. The sound insulation cotton and the chambers in a number of upper chambers form an impedance sound absorption unit, which can eliminate the medium and high frequency noise of the expander.

[0043] Although the water vapor completes the gas-liquid separation through the water vapor separation membrane partition 2, there is still a part of water vapor in the air flow. Therefore, a water isolation net 7 is respectively provided in a number of the first sound absorption holes 3b, which can effectively prevent the water vapor from wetting the sound absorption cotton and avoid the reduction of the sound absorption effect of the sound absorption cotton.

[0044] In this embodiment, the water isolation net 7 has a number of micropores to facilitate the penetration of sound and at the same time restrict the passage of water vapor. The water isolation net 7 can be made of metal materials, nylon or other materials, and this embodiment does not make any limitation in this regard.

[0045] It should be noted that the shapes and areas of the first sound-damping hole 3b and the second sound-damping hole 3c are obtained through targeted tuning according to the characteristics of automotive exhaust noise, and this embodiment does not limit this.

[0046] As Figures 1 - 2 shown, the air inlet 1a, the air outlet 1b of the housing 1 and the channel 3a of the inner core 3 are located on the same axis, and a straight-through structure is adopted, which can effectively reduce the exhaust resistance. At the same time, a structural design with a rounded corner at one end of the channel 3a close to the water vapor separation membrane partition 2 is adopted to further reduce the air flow resistance.

[0047] As Figure 2 shown, there are gaps between the bottom of the frame 21 and the bottom of the inner core 3 and the inner bottom of the housing 1 respectively, and they are respectively communicated with the drain port 1c to form a drain groove 1f; the liquid after gas-liquid separation is easily blown to the inner bottom of the housing 1 by the air flow. Therefore, by adopting the method that there are gaps between the bottom of the frame 21 and the bottom of the inner core 3 and the inner bottom of the housing 1 respectively, it is convenient for the liquid to drain from the drain port.

[0048] It should be noted that when the inner core 3 is assembled in the housing 1, there is a gap between the lower chamber and the inner wall of the housing 1, and the gap is communicated with the drain groove 1f. Since the air flow entering the channel 3a will also carry a small part of the liquid, the liquid falls into the lower chamber through the second sound-damping hole 3c and enters the drain groove 1f to complete drainage.

[0049] As Figure 2 shown, a protrusion 11 is provided on the inner bottom of the housing 1 on one side close to the drain port, and the structure of the protrusion 11 presents a triangular slope structure. When the hydrogen fuel cell vehicle is in a low-power consumption or idling stop state, a small amount of water in the housing 1 will not flow out due to the blockage of the protrusion 11. When the vehicle is running, the exhaust air flow increases, and the water is quickly blown to the drain port 1c by the air flow. The protrusion 11 with a triangular slope structure reduces the backflow of water, thereby realizing rapid drainage; at the same time, through the protrusion 11 with a triangular slope structure, it is also possible to avoid drainage in the stop state and drainage during the low-power consumption idling of the fuel cell stack, improving the customer's driving experience.

[0050] As Figures 1 - 2 shown, the drain valve 6 is arranged at the drain port 1c; in this embodiment, the drain valve 6 is a normally open valve for normal drainage; the bottom of the drain valve 6 has a slender opening, which can prevent external sundries from entering the housing 1 while not affecting drainage.

[0051] The working principle of this embodiment is:

[0052] When water vapor enters from the air inlet 1a and passes through the water vapor separation membrane partition 2, gas-liquid separation is completed. The air flow continues to discharge from the housing 1 along the direction of the channel 3a - air outlet 1b. The air flow after gas-liquid separation enters the inner core 3. A number of lower chambers form a resistance muffling unit. During the sound propagation process, reflection and interference of sound energy occur in the lower chambers, thereby reducing the sound energy radiated outward. The sound insulation cotton and chambers in a number of upper chambers form an impedance muffling unit, which can eliminate the medium and high frequency noise of the expander; the liquid falls into the drain trough 1f and is discharged through the drain port 1c under the blowing of the air flow.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydrogen fuel cell vehicle exhaust muffler, characterized in that, Comprising: A housing having a cavity, with an air inlet and an air outlet respectively provided on opposite sides thereof and communicating with the cavity; a drain port communicating with the cavity is further provided at one end of the bottom of the housing near the air outlet. A water vapor separation membrane partition disposed in the cavity on the side near the air inlet. An inner core disposed in the cavity and having a through-channel; the tail of the channel communicates with the air outlet. Wherein, there are gaps between the bottom of the water vapor separation membrane partition and the bottom of the inner core and the inner bottom of the housing, and the gaps communicate with the drain port to form a drain groove.

2. The exhaust muffler for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The inner core divides the upper part of the cavity into several first chambers and divides the lower part of the cavity into several second chambers; the channel is provided with several first sound-absorbing holes respectively communicating with the first chambers and several second sound-absorbing holes respectively communicating with the second chambers. Sound-absorbing cotton is filled in several of the first chambers respectively.

3. The exhaust muffler for a hydrogen fuel cell vehicle according to claim 2, characterized in that, Waterproof meshes are respectively provided at several of the first sound-absorbing holes.

4. A hydrogen fuel cell vehicle exhaust muffler according to claim 1, characterized in that, It further includes a baffle plate disposed in the cavity and located between the water vapor separation membrane partition and the air inlet.

5. The exhaust muffler for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The water vapor separation membrane partition includes: A frame inclinedly disposed in the cavity; the frame has a mounting groove. A water vapor separation membrane body disposed in the mounting groove.

6. The exhaust muffler of a hydrogen fuel cell vehicle according to claim 1, characterized in that, It further includes a drain valve provided at the drain port.

7. The exhaust muffler for a hydrogen fuel cell vehicle according to claim 1, characterized in that, A protrusion is provided on the inner bottom of the housing on the side near the drain port.

8. A hydrogen fuel cell vehicle exhaust muffler according to claim 1, characterized in that, One end of the channel near the water vapor separation membrane partition has a rounded corner.

9. The exhaust muffler for a hydrogen fuel cell vehicle according to claim 1, characterized in that, The air inlet, the air outlet and the channel are on the same axis.

Images