Air inlet noise reduction streaming piece and breathing machine

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to an air inlet silencing streaming piece and a breathing machine. The air inlet noise reduction streaming piece comprises a plurality of streaming pieces distributed at intervals and partition plates connected between every two adjacent streaming pieces, a noise reduction channel allowing air to circulate is formed between every two adjacent streaming pieces, the partition plates are located in the noise reduction channel and divide the noise reduction channel into two sub-channels, air inlets are formed in the first ends of the sub-channels, and air outlets are formed in the second ends of the sub-channels. The second end opposite to the first end forms an air outlet. The multiple streaming pieces arranged at intervals can disperse airflow, and the partition plates connected between every two adjacent streaming pieces can layer the airflow, so that the whole airflow is dispersed into multiple small airflow, the flow speed of gas flowing to the branch channels from the gas inlet is reduced, and then the flow speed of gas flowing out of the gas outlet after speed reduction in the branch channels is reduced; the flow rate of the gas flowing to the inlet of the fan is reduced, so that the noise of the whole respirator is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, in particular to an air intake silencer flow-around sheet and a ventilator. Background Art

[0002] A positive pressure ventilation machine is a type of ventilator. Its principle is to use a fan to draw air to provide the user with ventilation at a pressure higher than atmospheric pressure to help the user open the airway so that the user can breathe spontaneously.

[0003] When the positive pressure ventilation machine is working, the fan rotates at high speed, and a high-speed airflow is generated at the inlet of the fan. The high-speed airflow enters the rotating fan and generates noise. In order to reduce the noise of the whole machine, most traditional positive pressure ventilation machines use a large amount of sound-absorbing cotton.

[0004] However, the sound-absorbing cotton is large in size and has a poor noise reduction effect. Moreover, it is easy to produce dust particles that are harmful to human health and reduce the user experience. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide an air intake silencer bypass plate and a respirator in view of the problem that the existing respirator has poor noise reduction effect when using sound-absorbing cotton to reduce noise.

[0006] In order to solve the above-mentioned technical problems, on the one hand, an embodiment of the utility model provides an air intake silencer bypass plate, comprising a plurality of bypass plates distributed at intervals and a partition connected between two adjacent bypass plates, a silencer channel for gas circulation is formed between the two adjacent bypass plates, the partition is located in the silencer channel and divides the silencer channel into two sub-channels, the first end of the sub-channel forms an air inlet, and the second end arranged opposite to the first end forms an air outlet, and the air outlet is used to connect to the inlet of the fan of the ventilator.

[0007] Optionally, the first ends of the plurality of flow circumference plates are bent toward the same side, the plurality of flow circumference plates are divided into a first flow circumference plate located at the innermost side, a second flow circumference plate located at the outermost side, and a third flow circumference plate located between the first flow circumference plate and the second flow circumference plate, the lengths of the first flow circumference plate and the third flow circumference plate are both greater than the length of the third flow circumference plate, and the first end of the first flow circumference plate and the first end of the second flow circumference plate are close to each other to form a primary air inlet for gas to flow into the branch channel;

[0008] The gap between the first end of the first flow bypass plate and the first end of the third flow bypass plate forms a first secondary air inlet of the corresponding sub-channel, and the gap between the first end of the second flow bypass plate and the first end of the third flow bypass plate forms a second secondary air inlet of the corresponding sub-channel. The first secondary air inlet and the second secondary air inlet are connected to the primary air inlet to form the air inlet.

[0009] Optionally, it further comprises a first baffle plate arranged in the primary air inlet, wherein the first baffle plate is arranged perpendicular to the gas flow direction in the primary air inlet and is fixed on the baffle plate;

[0010] There is a gap between the first baffle and the inner wall of the first flow-circling plate, and / or there is a gap between the first baffle and the inner wall of the second flow-circling plate.

[0011] Optionally, the first flow-circling plate includes a first straight section and a first bent section, and the second flow-circling plate includes a second straight section, a third straight section and a second bent section connected in sequence, and the first bent section is formed by bending and extending one end of the first straight section;

[0012] The second straight section is arranged parallel to the first straight section and spaced apart, the third straight section is formed by bending and extending one end of the second straight section, the second bent section is formed by bending and extending the second straight section, and the second bent section is arranged corresponding to the first bent section and bends to the same side as the first bent section;

[0013] One side of the first baffle is connected to the first bending section, the third straight section extends in a direction perpendicular to the first baffle, and a gap is formed between the side of the first baffle facing away from the first bending section and the third straight section.

[0014] Optionally, the first bending section and the second bending section are bent toward the inner side of the air intake silencer bypass plate.

[0015] Optionally, the second flow bypass plate further includes a fourth straight section connected to the end of the second bending section, wherein the fourth straight section extends along the extension direction of the third straight section and extends out of the primary air inlet, so as to guide the gas into the primary air inlet.

[0016] Optionally, a second baffle is further included, the second baffle is located at the first secondary air inlet and is arranged perpendicular to the first baffle, the bottom end of the second baffle is connected to the partition, and the side surface of the second baffle is connected to the first bending section;

[0017] There is a gap between the side surface of the second baffle away from the first bending section and the first end of the third flow-circling sheet.

[0018] Optionally, two third flow-around sheets are provided, and the two third flow-around sheets are respectively a third A flow-around sheet arranged adjacent to the first flow-around sheet and a third B flow-around sheet arranged adjacent to the second flow-around sheet, and the length of the third A flow-around sheet is less than the length of the third B flow-around sheet;

[0019] The first end of the third A flow-through sheet faces the side surface of the second baffle plate and is spaced apart from the second baffle plate, and the first end of the third B flow-through sheet is spaced apart from the first baffle plate.

[0020] Optionally, the partition is arranged perpendicular to the flow-around sheet.

[0021] In the air intake silencer bypass plate of the utility model, a plurality of bypass plates arranged at intervals can disperse the airflow, and the partition connected between two adjacent bypass plates can also stratify the airflow, thereby dispersing the entire airflow into multiple small airflows, so that the gas flow rate from the air inlet to the branch channel is reduced, and then the gas flow rate flowing out of the air outlet after deceleration in the branch channel is reduced, that is, the gas flow rate flowing to the inlet of the fan is reduced, so as to reduce the noise of the whole respirator. Compared with the respirator in the prior art that uses sound-absorbing cotton to reduce noise, the respirator of the utility model reduces the noise generated by the airflow entering the fan 2 by reducing the airflow speed flowing into the fan 2 through the air intake silencer bypass plate 3, has a better noise reduction effect, is small in size, and can avoid the generation of dust particles that harm human health, and has a better user experience.

[0022] On the other hand, an embodiment of the utility model provides a respirator, comprising a housing, a fan installed in the housing and the above-mentioned air inlet silencer flow-around plate, wherein the housing is provided with an air inlet connected to the air inlet of the branch channel, and the air outlet of the branch channel is connected to the inlet of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a ventilator provided by an embodiment of the utility model;

[0024] Figure 2 yes Figure 1 Exploded view of the fan and intake silencer flow-around plate;

[0025] Figure 3 yes Figure 2 A schematic diagram of the structure of the air intake silencer flow-around plate;

[0026] Figure 4 yes Figure 3 A top view of

[0027] Figure 5 yes Figure 3 Rear view of

[0028] The reference numerals in the specification are as follows:

[0029] 1. Casing; 2. Fan; 3. Air intake silencer bypass plate; 31. First bypass plate; 311. First straight section; 312. First bent section; 32. Second bypass plate; 321. Second straight section; 322. Third straight section; 323. Second bent section; 324. Fourth straight section; 33. Third bypass plate; 331. Third A bypass plate; 332. Third B bypass plate; 34. Branch channel; 35. Partition plate; 36. Primary air inlet; 37. First secondary air inlet; 38. Second secondary air inlet; 4. First baffle plate; 5. Second baffle plate; 6. Fan casing; 61. Air inlet channel; 62. Positioning column. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a ventilator, including a shell 1, an air intake silencer bypass plate 3 and a fan 2 installed in the shell 1, the shell 1 is provided with an air inlet, the outer cover of the fan 2 is provided with a fan casing 6, the fan casing 6 is provided with an air intake channel 61, the air intake channel 61 connects the inlet of the ventilator 2 and the air inlet, the air intake silencer bypass plate 3 is installed in the air intake channel 61 and is arranged close to the inlet of the fan 2.

[0032] When the fan 2 rotates at high speed, the outside air flows into the air inlet channel 61 at high speed from the air inlet, and enters the fan 2 from the inlet after being decelerated by the air inlet silencer bypass plate 3. The fan 2 compresses the air and provides ventilation with a pressure higher than atmospheric pressure to the user.

[0033] like Figures 3 to 5 As shown, the air intake muffler flow plate 3 includes a plurality of flow plates distributed at intervals and a partition 35 connected between two adjacent flow plates, and a muffler channel for gas circulation is formed between the two adjacent flow plates. The partition 35 is located in the muffler channel and divides the muffler channel into two branch channels 34, the first end of the branch channel 34 forms an air inlet, and the second end opposite to the first end forms an air outlet, and air can flow into the branch channel 34 from the air inlet, and flow out from the air outlet after deceleration in the branch channel 34.

[0034] The air inlet of the branch channel 34 is connected to the air inlet of the housing 1, and the air outlet of the branch channel 34 is connected to the inlet of the fan 2. Figure 1As shown, the arrows in the figure indicate the direction of airflow. When the fan 2 rotates at a high speed, the air entering the air inlet channel 61 from the air inlet flows toward the air inlet silencer bypass plate 3 at a high speed. The multiple bypass plates arranged at intervals disperse the high-speed airflow. At the same time, the partition plate 35 connected between two adjacent bypass plates also layers the airflow, so that the high-speed airflow is dispersed into multiple small airflows that enter each branch channel 34, so as to reduce the airflow velocity flowing into the branch channel 34, thereby reducing the airflow velocity flowing from the air outlet of the branch channel 34 to the inlet of the fan 2, thereby reducing the noise of the whole machine.

[0035] In the respirator of the utility model, when the fan 2 rotates at high speed, the air entering the housing 1 from the air inlet flows to the air inlet silencer bypass plate 3 at high speed. The multiple bypass plates arranged at intervals disperse the high-speed airflow. At the same time, the partition 35 connected between two adjacent bypass plates also delaminates the airflow, so that the high-speed airflow is dispersed into multiple small airflows entering each branch channel 34, so as to reduce the airflow velocity flowing from the air inlet into the branch channel 34, thereby reducing the airflow velocity flowing from the air outlet to the inlet of the fan 2 after deceleration in the branch channel 34, thereby reducing the noise of the whole machine. Compared with the respirator in the prior art that uses sound-absorbing cotton to reduce noise, the respirator of the utility model reduces the noise generated by the airflow entering the fan 2 by reducing the airflow velocity flowing into the fan 2 through the air inlet silencer bypass plate 3, has a better noise reduction effect, is small in size, and can avoid the generation of dust particles that harm human health, and has a better user experience.

[0036] In one embodiment, if Figure 4 As shown, the first ends of multiple flow plates are bent to the same side, and the multiple flow plates are divided into a first flow plate 31 located at the innermost side, a second flow plate 32 located at the outermost side, and a third flow plate 33 located between the first flow plate 31 and the second flow plate 32. The lengths of the first flow plate 31 and the third flow plate 33 are both greater than the length of the third flow plate 33. The first end of the first flow plate 31 and the first end of the second flow plate 32 are close to each other to form a primary air inlet 36 for gas to flow into the branch channel 34.

[0037] The gap between the first end of the first flow plate 31 and the first end of the third flow plate 33 forms a first secondary air inlet 37 of the corresponding branch channel 34, and the gap between the first end of the second flow plate 32 and the first end of the third flow plate 33 forms a second secondary air inlet 38 of the corresponding branch channel 34. The first secondary air inlet 37 and the second secondary air inlet 38 are connected to the primary air inlet 36 to form an air inlet.

[0038] When high-speed airflow flows into the air intake silencer bypass plate 3, it is first stratified by the partition 35 to achieve primary deceleration. The stratified gas enters the primary air inlet 36 of each layer. Then, the gas in the primary air inlet 36 of each layer is dispersed into small airflows by the third bypass plate 33 to achieve secondary deceleration. The small airflows after secondary deceleration flow to the corresponding branch channels 34 through the first secondary air inlet 37 and the second secondary air inlet 38 respectively, so as to achieve layer-by-layer and step-by-step deceleration and improve the deceleration and noise reduction effect.

[0039] In one embodiment, a first baffle plate 4 is further included, which is disposed in the primary air inlet 36 . The first baffle plate 4 is disposed perpendicular to the gas flow direction in the primary air inlet 36 and is fixed on the partition plate 35 .

[0040] There is a gap between the first baffle 4 and the inner wall of the first flow plate 31 , and / or there is a gap between the first baffle 4 and the inner wall of the second flow plate 32 , so that the first secondary air inlet 37 and the second secondary air inlet 38 are connected to the primary air inlet 36 .

[0041] After the high-speed airflow enters the primary air inlet 36, the first baffle 4 blocks the stratified airflow, so that the stratified gas is decelerated and then flows to the first secondary air inlet 37 and the second secondary air inlet 38, so as to further improve the deceleration effect of the air intake silencer bypass plate 3, thereby further improving the noise reduction effect.

[0042] In one embodiment, the first flow-circuiting plate 31 includes a first straight section 311 and a first bent section 312, and the second flow-circuiting plate 32 includes a second straight section 321, a third straight section 322 and a second bent section 323 connected in sequence, and the first bent section 312 is formed by bending and extending one end of the first straight section 311.

[0043] The second straight section 321 is arranged parallel to the first straight section 311 and spaced apart. The third straight section 322 is formed by bending and extending one end of the second straight section 321. The second bent section 323 is formed by bending and extending the second straight section 321. The second bent section 323 is arranged corresponding to the first bent section 312 and bends to the same side as the first bent section 312.

[0044] One side of the first baffle plate 4 is connected to the first bending section 312 . The third straight section 322 extends in a direction perpendicular to the first baffle plate 4 . There is a gap between the side of the first baffle plate 4 facing away from the first bending section 312 and the third straight section 322 .

[0045] The first baffle 4 is arranged on the first bending section 312, and the first baffle 4 blocks the gas in the primary air inlet 36 from flowing directly to the first secondary air inlet 37. The gap between the first baffle 4 and the third straight section 322 is directly opposite to the second secondary air inlet 38, and the gas in the primary air inlet 36 can flow directly from the gap between the first baffle 4 and the third straight section 322 to the second secondary air inlet 38, so that the flow velocity of the airflow flowing into the outermost branch channel 34 is greater than the flow velocity of the airflow flowing into the innermost branch channel 34. Since the length of the second bypass plate 32 is greater than the length of the first bypass plate 31, the length of the outermost branch channel 34 is greater than the length of the innermost branch channel 34, therefore, the airflow velocity of the airflow with a higher flow velocity flowing out of the air outlet after deceleration in the branch channel 34 with a longer length can be balanced with the airflow velocity of the airflow with a lower flow velocity flowing out of the air outlet after deceleration in the branch channel 34 with a shorter length, thereby obtaining a stable airflow.

[0046] In one embodiment, the second straight section 321 of the second flow plate 32 is perpendicular to the third straight section 322 , and the first straight section 311 of the first flow plate 31 is bent 90° and then bent and extended to form the first bent section 312 .

[0047] In one embodiment, the first bending section 312 and the second bending section 323 are bent toward the inner side of the air intake muffler bypass plate 3. Compared with the first bending section 312 and the second bending section 323 being bent toward the outer side of the air intake muffler bypass plate 3, this design makes the air intake muffler bypass plate 3 smaller in size and occupies less space.

[0048] In one embodiment, the first bending section 312 and the second bending section 323 are arc sections. The first straight section 311 and the second straight section 321 are inserted into the air inlet channel 61 of the fan housing 6. A positioning column 62 is provided on the side wall of the fan housing 6 near the air inlet. The radius of the arc section is the same as that of the positioning column 62. The first bending section 312 is attached to the outer wall of the positioning column 62.

[0049] In one embodiment, if Figure 1 and Figure 4 As shown, the second bypass plate 32 also includes a fourth straight section 324 connected to the end of the second bending section 323. The fourth straight section 324 extends along the extension direction of the third straight section 322 and extends out of the primary air inlet 36. The fourth straight section 324 is spaced apart from the side wall of the fan casing 6 to guide the gas into the primary air inlet 36.

[0050] In one embodiment, a second baffle 5 is further included, the second baffle 5 is located at the first secondary air inlet 37 and is arranged perpendicular to the first baffle 4, the bottom end of the second baffle 5 is connected to the partition 35, and the side of the second baffle 5 is connected to the first bending section 312. There is a gap between the side of the second baffle 5 away from the first bending section 312 and the first end of the third flow bypass plate 33.

[0051] The airflow in the primary air inlet 36 is blocked by the second baffle 5 when flowing toward the first secondary air inlet 37 , so as to further reduce the airflow velocity flowing toward the innermost branch channel 34 , thereby further balancing the flow velocity of the gas flowing out of each branch channel 34 .

[0052] In one embodiment, two third flow plates 33 are provided, and the two third flow plates 33 are respectively a third A flow plate 331 arranged adjacent to the first flow plate 31 and a third B flow plate 332 arranged adjacent to the second flow plate 32, the length of the third A flow plate 331 is smaller than the length of the third B flow plate 332, wherein the first end of the third B flow plate 332 is closer to the first baffle 4 than the first end of the third A flow plate 331.

[0053] The first end of the third A bypass plate 331 is opposite to the side of the second baffle 5 facing away from the first bending section 312 and is spaced apart from the second baffle 5, and the first end of the third B bypass plate 332 is spaced apart from the first baffle 4, so that both layers of the air intake silencer bypass plate 3 have three branch channels 34 to increase the number of branch channels 34, so that the airflow flowing out of the primary air inlet 36 can be dispersed into smaller airflows to further improve the deceleration and noise reduction effect.

[0054] In one embodiment, the third A flow-by-pass sheet 331 includes a fifth straight segment and a third bent segment formed by bending the first end of the fifth straight segment, the third B flow-by-pass sheet 332 includes a sixth straight segment and a seventh straight segment formed by bending and extending one end of the sixth straight segment, the fifth straight segment is parallel to the first straight segment 311, the sixth straight segment is parallel to the second straight segment 321, and the seventh straight segment is parallel to the third straight segment 322.

[0055] In the extension direction of the seventh straight section, there is a gap between the first end of the seventh straight section and the first baffle 4 , and the side surface of the seventh straight section close to the third straight section 322 is aligned with the side surface of the first baffle 4 facing away from the first bending section 312 .

[0056] In one embodiment, if Figure 5 As shown, the partition 35 is arranged perpendicular to the flow duct.

[0057] In other embodiments, the plurality of flow circumference plates may be straight plates.

[0058] In other embodiments, one side of the first baffle plate 4 may be connected to the second bending section 323, and a gap exists between the side of the first baffle plate 4 facing away from the second bending section 323 and the first bending section 312. Of course, both side surfaces of the first baffle plate 4 may have gaps with both the first bending section 312 and the second bending section 323.

[0059] In one embodiment, the first flow plate 31 and the second flow plate 32 may be arc-shaped as a whole. Of course, the first flow plate 31 and the second flow plate 32 may both be bent, each including two straight sections with a certain angle.

[0060] In other embodiments, the first bending section 312 and the second bending section 323 may be bent toward the outer side of the intake silencer flow bypass plate 3 .

[0061] In other embodiments, the first bending section 312 may be in the shape of an oblique line or a folded line, and the second bending section 323 may be in the shape of an oblique line or a folded line.

[0062] In other embodiments, one, three or more third flow-circling plates 33 may be provided.

[0063] In other embodiments, the partition 35 may be tilted relative to the flow-around plate, and the angle between the partition 35 and the flow-around plate may be 30°, 60°, etc.

[0064] In addition, an embodiment of the present invention provides an air intake silencer flow plate 3, the structure of which is the same as the structure of the air intake silencer flow plate 3 in the above embodiment, and will not be repeated here.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air intake silencer flow-around plate, characterized in that: The invention comprises a plurality of flow-bending sheets distributed at intervals and a partition (35) connected between two adjacent flow-bending sheets, wherein a silencer channel for gas circulation is formed between the two adjacent flow-bending sheets, the partition (35) is located in the silencer channel and divides the silencer channel into two branch channels (34), the first end of the branch channel (34) forms an air inlet, and the second end arranged opposite to the first end forms an air outlet, and the air outlet is used to connect to the inlet of the fan (2) of the ventilator.

2. The air intake silencer flow-around plate according to claim 1, characterized in that: The first ends of the plurality of flow-around sheets are bent toward the same side, and the plurality of flow-around sheets are divided into a first flow-around sheet (31) located at the innermost side, a second flow-around sheet (32) located at the outermost side, and a third flow-around sheet (33) located between the first flow-around sheet (31) and the second flow-around sheet (32), the lengths of the first flow-around sheet (31) and the third flow-around sheet (33) are both greater than the length of the third flow-around sheet (33), and the first end of the first flow-around sheet (31) and the first end of the second flow-around sheet (32) are close to each other to form a primary air inlet (36) for gas to flow into the branch channel (34); The interval between the first end of the first flow bypass plate (31) and the first end of the third flow bypass plate (33) forms a first secondary air inlet (37) of the corresponding branch channel (34); the interval between the first end of the second flow bypass plate (32) and the first end of the third flow bypass plate (33) forms a second secondary air inlet (38) of the corresponding branch channel (34); the first secondary air inlet (37) and the second secondary air inlet (38) are connected to the primary air inlet (36) to form the air inlet.

3. The air intake silencer flow-around plate according to claim 2, characterized in that: It also comprises a first baffle (4) arranged in the primary air inlet (36), wherein the first baffle (4) is arranged perpendicular to the gas flow direction in the primary air inlet (36) and is fixed on the partition (35); There is a gap between the first baffle plate (4) and the inner wall of the first flow-around plate (31), and / or there is a gap between the first baffle plate (4) and the inner wall of the second flow-around plate (32).

4. The air intake silencer flow-around plate according to claim 3, characterized in that: The first flow-circling sheet (31) comprises a first straight section (311) and a first bent section (312); the second flow-circling sheet (32) comprises a second straight section (321), a third straight section (322) and a second bent section (323) which are connected in sequence; the first bent section (312) is formed by bending and extending one end of the first straight section (311); The second straight section (321) is arranged in parallel with the first straight section (311) and spaced apart from each other; the third straight section (322) is formed by bending and extending one end of the second straight section (321); the second bent section (323) is formed by bending and extending the second straight section (321); the second bent section (323) is arranged corresponding to the first bent section (312) and is bent to the same side as the first bent section (312); One side of the first baffle plate (4) is connected to the first bent section (312), the third straight section (322) extends in a direction perpendicular to the first baffle plate (4), and a gap is formed between the side of the first baffle plate (4) facing away from the first bent section (312) and the third straight section (322).

5. The air intake silencer flow-around plate according to claim 4, characterized in that: The first bending section (312) and the second bending section (323) are bent toward the inner side of the air intake silencer bypass plate.

6. The air intake silencer flow-around plate according to claim 4, characterized in that: The second flow bypass plate (32) further includes a fourth straight section (324) connected to the end of the second bent section (323), and the fourth straight section (324) extends along the extension direction of the third straight section (322) and extends out of the primary air inlet (36) for guiding gas to enter the primary air inlet (36).

7. The air intake silencer flow-around plate according to claim 4, characterized in that: It also comprises a second baffle (5), the second baffle (5) being located at the first secondary air inlet (37) and arranged perpendicularly to the first baffle (4), the bottom end of the second baffle (5) being connected to the partition (35), and the side surface of the second baffle (5) being connected to the first bending section (312); There is a gap between the side surface of the second baffle (5) away from the first bending section (312) and the first end of the third flow-circling sheet (33).

8. The air intake silencer flow-around plate according to claim 7, characterized in that: Two third flow-around sheets (33) are provided, and the two third flow-around sheets (33) are respectively a third A flow-around sheet (331) arranged adjacent to the first flow-around sheet (31) and a third B flow-around sheet (332) arranged adjacent to the second flow-around sheet (32), and the length of the third A flow-around sheet (331) is shorter than the length of the third B flow-around sheet (332); The first end of the third A flow-through sheet (331) faces the side of the second baffle (5) and is spaced apart from the second baffle (5); the first end of the third B flow-through sheet (332) is spaced apart from the first baffle (4).

9. The air intake silencer flow-around plate according to any one of claims 1 to 8, characterized in that: The partition plate (35) is arranged perpendicular to the flow-around sheet.

10. A ventilator, characterized in that: The invention comprises a housing (1), a fan (2) installed in the housing (1) and an air intake silencer flow plate (3) according to any one of claims 1 to 9, wherein the housing (1) is provided with an air inlet connected to an air inlet of the branch channel (34), and an air outlet of the branch channel (34) is connected to an inlet of the fan (2).

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