Noise reduction mechanism for a ventilator

Abstract

The present invention relates to the technical field of noise reduction devices. A noise reduction mechanism for a ventilator is disclosed, which includes a noise reduction cylinder detachably connected to a blower. One end of the noise reduction cylinder is open, and the other end of the noise reduction cylinder is communicated with an air outlet pipe. A primary noise reduction layer is provided on the inner wall of the noise reduction cylinder, and a flow guiding structure for guiding gas to the primary noise reduction layer is symmetrically arranged along the central line of the noise reduction cylinder on the primary noise reduction layer. It also includes a secondary noise reduction layer communicated with the flow guiding structure. This solution mainly solves the problem of relatively large noise of current facial protection devices.

Description

Technical Field

[0001] The present invention relates to the technical field of noise reduction devices. Background Art

[0002] The progress of social industrialization and urbanization has made smog relatively common, and the occurrence of social emergency infectious diseases has also emerged. At this time, it is necessary to take protective measures for the face. The main face protection measures are carried out by wearing masks and other means. The mask is used to isolate pollutants with particles above PM2.5 and droplets carrying germs from others. At present, the best mask product for isolation is the N95 mask.

[0003] The N95 mask can isolate smaller particles, and its filtration efficiency for particles with an aerodynamic diameter of 0.075μm ± 0.02μm reaches more than 95%. The aerodynamic diameters of airborne bacteria and fungal spores vary between 0.7 - 10μm, and such airborne bacteria and fungal spores are also within the protection range of the N95 mask. Moreover, the N95 mask fits more closely to the face and is not easily leaked from the periphery. However, after wearing the N95 mask for a long time, it is easy to cause difficulty in breathing for users due to its good isolation performance, and even symptoms of dizziness may occur due to hypoxia, especially for the elderly and children with relatively weak constitutions. Therefore, a face protection device that can protect the user's face and allow for smooth breathing has emerged.

[0004] The existing face protection device includes a breathing mask and a ventilator for filtering air. Among them, the ventilator includes a filter layer and a blower connected in sequence, and is communicated with the breathing mask through the blower; when in use, the breathing mask is worn on the face, the blower is started, and the outside air is sent to the breathing mask through the filter layer by the blower for people to breathe; however, the blower makes a relatively large noise during operation, which will directly have an adverse impact on the work of the user. Summary of the Invention

[0005] The present invention aims to provide a noise reduction mechanism for a ventilator to solve the problem of relatively large noise in the current face protection device.

[0006] To achieve the above object, the basic solution of the present invention is as follows: A noise reduction mechanism for a ventilator includes a noise reduction cylinder detachably connected to the blower. One end of the noise reduction cylinder is open, and the other end of the noise reduction cylinder is communicated with an air outlet pipe; a primary noise reduction layer is provided on the inner wall of the noise reduction cylinder, and a flow guiding structure for guiding gas to the primary noise reduction layer is symmetrically provided on the primary noise reduction layer along the central axis of the noise reduction cylinder; it also includes a secondary noise reduction layer communicated with the flow guiding structure.

[0007] Advantages of the basic solution:

[0008] 1. In this scheme, the noise reduction cylinder is connected to the fan, and the outlet pipe is connected to the breathing mask; the fan generates airflow, and the gas is used as a medium for noise transmission; the gas enters the noise reduction cylinder, and the gas moves toward the primary noise reduction layer under the action of the guide structure, and the noise is reduced by the primary noise reduction layer; the noise is reduced again by the secondary noise reduction layer, so that the gas that has been noise-reduced twice is input from the outlet pipe into the breathing mask; compared with the prior art, this scheme effectively reduces the noise by reducing the noise twice, thereby enabling the user to work normally.

[0009] 2. The noise reduction cylinder and the fan of this solution are detachably connected, which is convenient for installation and disassembly. In a highly virus-contaminated environment, this solution can be used as a disposable product. After use, it can be directly disassembled and recycled without having to be used a second time, thus avoiding the harm caused by secondary use.

[0010] Furthermore, the primary noise reduction layer includes sound-absorbing cotton and a first sound-absorbing board which are sequentially arranged from the outer wall of the noise reduction tube to the inner wall of the noise reduction tube.

[0011] Through the above arrangement, the noise is reduced by the sound-absorbing cotton and the first sound-absorbing board, and the noise reduction effect is good.

[0012] Furthermore, the guide structure is a guide channel opened on the first sound absorbing plate, and the guide channel is wavy.

[0013] Through the above arrangement, the gas flows in the guide channel, and then the noise is reduced through the sound-absorbing cotton and the first sound-absorbing board; and, since the guide channel is wavy, the flow time of the gas is extended, thereby enhancing the noise reduction effect.

[0014] Furthermore, the secondary noise reduction layer includes a fixing plate fixed to the first sound absorbing plate and noise reduction cotton fixed to the fixing plate, the fixing plate is provided with a vertical hole, and the vertical hole is connected to the guide channel; a plurality of through holes connected to the vertical holes are provided on the side wall of the fixing plate, and the through holes are arranged in the direction of the noise reduction cotton.

[0015] Through the above arrangement, the gas enters the vertical hole through the guide channel, and then passes through the through hole from the vertical hole to act on the noise reduction cotton, and the noise is reduced again by the noise reduction cotton; and the gas will also weaken the intensity of the noise in the flow path of the vertical hole and the through hole.

[0016] Furthermore, a guide plate is symmetrically arranged on the fixing plate along the center line of the fixing plate, and the guide plate is fixedly connected to the first sound absorbing plate, and a plurality of air holes are arranged on the guide plate.

[0017] With the above settings, the gas continues to flow through the noise reduction cotton. A part of the gas moves towards the sound absorption cotton and the first sound absorption board under the guiding action of the diversion board. After the noise reduction treatment of the sound absorption cotton and the first sound absorption board, it then flows through the air holes towards the air outlet pipe; another part of the gas directly flows through the air holes towards the air outlet pipe. Moreover, the diversion board, the fixed board, and the first sound absorption board form a triangular structure, and according to the stability of the triangle, the stability of the overall structure can be improved.

[0018] Furthermore, a return pipe is provided on the first sound absorption board. One end of the return pipe communicates with the diversion channel, and the other end of the return pipe is located between the fixed board and the diversion board; a one-way valve for the one-way flow of gas towards the diversion channel is provided on the return pipe.

[0019] With the above settings, the gas continues to flow through the noise reduction cotton. A part of the gas moves towards the return pipe under the guiding action of the diversion board, so that the gas re-enters the diversion channel through the return pipe, thereby extending the flow path of the gas. On the one hand, the noise is further reduced by the sound absorption cotton, the first sound absorption board, and the noise reduction cotton again. On the other hand, it can also make the gas re-pass through the vertical holes, through holes, and noise reduction cotton, thereby strengthening the noise reduction effect.

[0020] Furthermore, a second sound absorption board is provided between the two diversion boards.

[0021] With the above settings, the gas acts on the second sound absorption board through the air holes, and the noise is reduced by the second sound absorption board, strengthening the noise reduction effect on the noise. Moreover, the two diversion boards and the second sound absorption board form a triangular structure, and according to the stability of the triangle, the stability of the overall structure can be improved.

[0022] Furthermore, a shunt pipe is provided at the open end of the noise reduction cylinder, and the shunt pipe is communicated with the end of the diversion channel far from the vertical hole; a conical pipe is provided in the noise reduction cylinder, and the conical pipe is located between the second sound absorption board and the air outlet pipe; the width of the conical pipe gradually decreases from the shunt pipe towards the air outlet pipe, and the conical pipe is communicated with the air outlet pipe.

[0023] With the above settings, the shunt pipe can shunt the gas entering the noise reduction cylinder, and then introduce the gas into the diversion channel, and use the sound absorption cotton and the first sound absorption board to reduce the noise, improving the noise reduction efficiency; the conical pipe can collect the gas that has undergone multiple noise reduction treatments and accelerate the delivery to the breathing mask, thereby providing oxygen for the user faster.

[0024] Furthermore, the shunt pipe is a flexible pipe, and the shunt pipe includes a horizontal section, a first inclined section, and a second inclined section.

[0025] With the above settings, using a flexible pipe as the shunt pipe has a low cost.

[0026] Further, a side hole is provided on the side of the fixing plate away from the through hole, and an elastic layer is provided on the side hole; an extrusion block is fixedly connected to the elastic layer, and the extrusion block is located between the first inclined section and the second inclined section. The expansion of the elastic layer drives the extrusion block to simultaneously extrude the first inclined section and the second inclined section, so that the air intake of the first inclined section and the second inclined section becomes smaller; a pipe is connected to the through hole, and a pressure relief valve is provided on the pipe.

[0027] Through the above settings, the gas enters the vertical hole through the diversion channel. When more and more gas enters the vertical hole, the pressure increases; the gas acts on the elastic layer, causing the elastic layer to expand; the elastic layer drives the extrusion block to move towards the gap between the first inclined section and the second inclined section. The elastic layer continues to expand, and the elastic layer drives the extrusion block to squeeze the first inclined section and the second inclined section, so that the air intake of the first inclined section and the second inclined section becomes smaller; moreover, at this time, the pressure value in the vertical hole is greater than the critical value of the pressure relief valve, and the pressure relief valve opens. The gas in the vertical hole is ejected through the through hole and acts on the noise reduction cotton. In this way, the flow rate of the air flow towards the air outlet pipe can be increased, and thus oxygen can be provided to the user faster.

[0028] Moreover, when the extrusion block simultaneously squeezes the first inclined section and the second inclined section, a triangular structure is formed by the first inclined section, the second inclined section, and the extrusion block. According to the stability of the triangle, the overall structural stability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view in the main viewing direction of the first embodiment of the noise reduction mechanism for a ventilator according to the present invention;

[0030] Figure 2 It is a cross-sectional view in the main viewing direction of the second embodiment of the noise reduction mechanism for a ventilator according to the present invention;

[0031] Figure 3 It is a cross-sectional view in the main viewing direction of the third embodiment of the noise reduction mechanism for a ventilator according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0032] The following is a further detailed description through specific embodiments:

[0033] The reference numerals in the accompanying drawings of the specification include: noise reduction cylinder 1, shunt pipe 2, horizontal section 211, first inclined section 212, second inclined section 213, air outlet pipe 3, sound absorption cotton 4, first sound absorption plate 5, diversion channel 6, fixing plate 7, noise reduction cotton 8, vertical hole 9, through hole 10, diversion plate 11, air hole 12, second sound absorption plate 13, return pipe 14, one-way valve 15, conical pipe 16, elastic layer 17, extrusion block 18, pressure relief valve 19.

[0034] Embodiment 1

[0035] Basically as shown in the attached Figure 1As shown: A noise reduction mechanism for a ventilator, including a noise reduction cylinder 1 with an open left end. The right end of the noise reduction cylinder 1 is connected to an air outlet pipe 3; the left end of the noise reduction cylinder 1 is connected to a blower by bolts.

[0036] On the inner wall of the noise reduction cylinder 1, a primary noise reduction layer is provided. The primary noise reduction layer includes a sound-absorbing cotton 4 and a first sound-absorbing plate 5, and the sound-absorbing cotton 4 and the first sound-absorbing plate 5 are arranged in sequence from the outer wall of the noise reduction cylinder 1 towards the inner wall of the noise reduction cylinder 1. The sound-absorbing cotton 4 is bonded to the inner wall of the noise reduction cylinder 1, the first sound-absorbing plate 5 is bonded to the sound-absorbing cotton 4, and both ends of the first sound-absorbing plate 5 are fixed to the inner wall of the noise reduction cylinder 1 by bolts. On the first sound-absorbing plate 5, a flow guiding structure for guiding gas to the primary noise reduction layer is symmetrically arranged along the central line of the noise reduction cylinder 1. The flow guiding structure is a flow guiding channel 6 opened on the first sound-absorbing plate 5, and the flow guiding channel 6 is wavy.

[0037] It further includes a secondary noise reduction layer communicated with the flow guiding structure. The secondary noise reduction layer includes a fixing plate 7 and noise reduction cotton 8. The fixing plate 7 is fixed to the first sound-absorbing plate 5 by bolts, and the noise reduction cotton 8 is bonded to the right side wall of the fixing plate 7. A vertical hole 9 is vertically opened on the fixing plate 7, and the vertical hole 9 is communicated with the right end of the flow guiding channel 6; several through holes 10 communicated with the vertical hole 9 are opened on the right side wall of the fixing plate 7, and the through holes 10 are arranged towards the noise reduction cotton 8. Two flow guiding plates 11 are fixed to the right side wall of the fixing plate 7 by bolts, and the flow guiding plates 11 are connected to the first sound-absorbing plate 5 by bolts. The two flow guiding plates 11 are symmetrically arranged with respect to the horizontal center line of the fixing plate 7; several air holes 12 are opened on the flow guiding plates 11. A triangular structure is formed by the flow guiding plates 11, the fixing plate 7 and the first sound-absorbing plate 5. According to the stability of the triangle, the stability of the overall structure can be improved.

[0038] A return pipe 14 is arranged on the first sound-absorbing plate 5. The left end of the return pipe 14 is communicated with the flow guiding channel 6, the right end of the return pipe 14 is located between the noise reduction cotton and the flow guiding plates 11, and a one-way valve 15 for unidirectional guiding of gas to flow into the flow guiding channel 6 is fixedly connected to the return pipe 14.

[0039] The specific implementation process is as follows:

[0040] Wrap the left end of the noise reduction cylinder 1 around the blower, and connect the noise reduction cylinder 1 and the blower by bolts; the air outlet pipe 3 is communicated with a breathing mask.

[0041] Start the blower. The blower generates air flow, and moreover, the blower will generate noise during operation, and the gas acts as a medium for noise propagation. The gas enters the noise reduction cylinder 1 and then enters the flow guiding channel 6. The noise is reduced by the sound-absorbing cotton 4 and the first sound-absorbing plate 5. And because the flow guiding channel 6 is wavy, the flow duration of the gas is prolonged, thereby strengthening the noise reduction effect.

[0042] The gas enters the vertical holes 9 through the diversion channel 6, then passes through the vertical holes 9 and the through holes 10 to act on the noise reduction cotton 8, and the noise is further reduced through the noise reduction cotton 8; moreover, the intensity of the noise will also be weakened during the flow path of the gas in the vertical holes and through holes.

[0043] The gas continues to flow through the noise reduction cotton 8. Part of the gas moves towards the direction of the return pipe 14 under the guiding action of the guiding plate 11, so that the gas re-enters the diversion channel 6 through the return pipe 14, thereby extending the flow path of the gas, that is, repeating the above noise reduction process, and the noise is further reduced through the sound-absorbing cotton 4, the first sound-absorbing plate 5 and the noise reduction cotton 8 to enhance the noise reduction effect; the other part of the gas flows towards the air outlet pipe through the air holes 12; the gas that has undergone multiple noise reduction treatments enters the breathing mask through the air outlet pipe 3 for the user to breathe, and the noise is greatly reduced. And, the cost of this solution is controlled between 120 - 150 yuan, which is more inexpensive and more practical than other noise reduction devices; in a highly virus-contaminated environment, this solution can be used as a disposable product, and after use, it can be directly disassembled for recycling without being used a second time, thereby avoiding the harm caused by secondary use.

[0044] Embodiment 2

[0045] Basically as shown in the appendix Figure 2 shown: The structure and implementation method of Embodiment 2 are basically the same as those of Embodiment 1, and the difference lies in that: a support plate is fixed at the left end inside the noise reduction cylinder 1 by bolts, a shunt pipe 2 is penetrated through the middle of the support plate, the shunt pipe 2 is in a Y shape, the left end of the shunt pipe 2 is in a flared shape, and the left end of the shunt pipe 2 abuts against the inner wall of the noise reduction cylinder 1. The two right ends of the shunt pipe 2 are respectively communicated with the upper and lower diversion channels 6.

[0046] A second sound-absorbing plate 13 is arranged between the two guiding plates 11, and the second sound-absorbing plate 13 is fixed on the guiding plate 11 by bolts. A conical pipe 16 is fixed at the right end inside the noise reduction cylinder 1 by bolts, and the conical pipe 16 is located between the second sound-absorbing plate 13 and the air outlet pipe 3; the width of the conical pipe 16 gradually decreases from the shunt pipe 2 towards the direction of the air outlet pipe 3, and the conical pipe 16 is communicated with the air outlet pipe 3.

[0047] The specific implementation process is as follows:

[0048] The fan generates air flow, and the air flow enters the shunt pipe 2. The gas is shunted through the shunt pipe 2, and then the gas is introduced into the diversion channel 6, and the noise is reduced by using the sound-absorbing cotton 4 and the first sound-absorbing plate 5, improving the noise reduction efficiency; the conical pipe 16 can collect the gas that has undergone multiple noise reduction treatments and accelerate the delivery to the breathing mask, so as to provide oxygen for the user faster.

[0049] The gas acts on the second sound absorption plate 13 through the air holes 12, and the second sound absorption plate 13 is used to reduce the noise, enhancing the noise reduction effect. Moreover, the two flow guiding plates 11 and the second sound absorption plate 13 form a triangular structure, and according to the stability of the triangle, the stability of the overall structure can be improved.

[0050] Embodiment Three

[0051] Basically as shown in the appendix Figure 3 shown: The structure and implementation manner of Embodiment Three are basically the same as those of Embodiment Two, and the difference lies in that: the shunt pipe 2 is a flexible pipe, and the shunt pipe 2 includes a horizontal section 211, a first inclined section 212, and a second inclined section 213.

[0052] A side hole is opened on the left side of the fixing plate 7, and an elastic layer 17 is bonded to the side hole, and the elastic layer 17 is made of rubber; an extrusion block 18 is fixedly connected to the elastic layer 17, and the extrusion block 18 is located between the first inclined section 212 and the second inclined section 213. The expansion of the elastic layer 17 drives the extrusion block 18 to simultaneously squeeze the first inclined section 212 and the second inclined section 213, so that the air intake of the first inclined section 212 and the second inclined section 213 becomes smaller; a pipe is connected to the through hole 10, and a pressure relief valve 19 is fixedly connected to the pipe.

[0053] The specific implementation process is as follows:

[0054] The gas enters the vertical hole 9 through the flow guiding channel 6. When more and more gas enters the vertical hole 9, the pressure increases; the gas acts on the elastic layer 17, causing the elastic layer 17 to expand; the elastic layer 17 drives the extrusion block 18 to move towards the gap between the first inclined section 212 and the second inclined section 213. The elastic layer 17 continues to expand, and the elastic layer 17 drives the extrusion block 18 to squeeze the first inclined section 212 and the second inclined section 213, so that the air intake of the first inclined section 212 and the second inclined section 213 becomes smaller; moreover, at this time, the pressure value in the vertical hole 9 is greater than the critical value of the pressure relief valve 19, and the pressure relief valve 19 opens. The gas in the vertical hole 9 is ejected through the through hole 10 and acts on the noise reduction cotton 8. By adopting such a method, the flow rate of the air flow towards the air outlet pipe 3 can be accelerated, and thus oxygen can be provided for the user faster.

[0055] Moreover, when the extrusion block 18 simultaneously squeezes the first inclined section 212 and the second inclined section 213, a triangular structure is formed by the first inclined section 212, the second inclined section 213, and the extrusion block 18. According to the stability of the triangle, the stability of the overall structure can be improved.

[0056] The above are only embodiments of the present invention, and common general knowledge such as specific structures and / or characteristics known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, and these should also be regarded as the protection scope of the present invention, which will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. Noise reduction mechanism for a ventilator, Characterized in that: It includes a noise reduction cylinder. The left end of the noise reduction cylinder is open and connected to the fan by bolts. The other end of the noise reduction cylinder is communicated with an air outlet pipe. A primary noise reduction layer is provided on the inner wall of the noise reduction cylinder. On the primary noise reduction layer, a flow guiding structure for guiding gas to the primary noise reduction layer is symmetrically arranged along the central line of the noise reduction cylinder. It also includes a secondary noise reduction layer communicated with the flow guiding structure; The primary noise reduction layer includes a first sound absorption board. The flow guiding structure is a flow guiding channel opened on the first sound absorption board. The secondary noise reduction layer includes a fixing board fixedly connected to the first sound absorption board. Vertical holes are provided on the fixing board, and the vertical holes are communicated with the flow guiding channel. A number of through holes communicated with the vertical holes are provided on the side wall of the fixing board. Flow guiding plates are symmetrically arranged along the central line of the fixing board on the fixing board. A second sound absorption board is arranged between the two flow guiding plates; A shunt pipe is provided at the open end of the noise reduction cylinder, and the shunt pipe is communicated with the end of the flow guiding channel far from the vertical hole. The shunt pipe is a flexible pipe, and the shunt pipe includes a horizontal section, a first inclined section and a second inclined section. A conical pipe is provided in the noise reduction cylinder, and the conical pipe is located between the second sound absorption board and the air outlet pipe. The width of the conical pipe gradually decreases from the shunt pipe to the direction of the air outlet pipe, and the conical pipe is communicated with the air outlet pipe; A side hole is provided on the side of the fixing board away from the through hole, and an elastic layer is provided on the side hole. An extrusion block is fixedly connected to the elastic layer, and the extrusion block is located between the first inclined section and the second inclined section. The expansion of the elastic layer drives the extrusion block to simultaneously extrude the first inclined section and the second inclined section, so that the air intake of the first inclined section and the second inclined section becomes smaller. A pipe is connected to the through hole, and a pressure relief valve is provided on the pipe.

2. The noise reduction mechanism for a ventilator according to claim 1, Characterized in that: The primary noise reduction layer includes a sound absorption cotton and a first sound absorption board arranged in sequence from the outer wall of the noise reduction cylinder to the inner wall of the noise reduction cylinder.

3. The noise reduction mechanism for a ventilator according to claim 2, Characterized in that: The flow guiding channel is wavy.

4. The noise reduction mechanism for a ventilator according to claim 3, Characterized in that: The secondary noise reduction layer includes a noise reduction cotton fixedly connected to the fixing board, and the through holes are arranged towards the noise reduction cotton.

5. The noise reduction mechanism for a ventilator according to claim 4, Characterized in that: The flow guiding plate is fixedly connected to the first sound absorption board, and a number of air holes are provided on the flow guiding plate.

6. The noise reduction mechanism for a ventilator according to claim 5, Characterized in that: A return pipe is provided on the first sound absorption board. One end of the return pipe is communicated with the flow guiding channel, and the other end of the return pipe is located between the fixing board and the flow guiding plate. A one-way valve for unidirectional flow of gas to the flow guiding channel is provided on the return pipe.

Images