Fan silencer with compressed air purging function

Abstract

The invention discloses a fan silencer with a compressed air blowing function, and belongs to the technical field of silencers, the fan silencer comprises an outer shell, a partition plate is arranged in the outer shell, an inner shell is arranged on the right side of the partition plate, inner silencing cotton is arranged on the inner wall of the inner shell, an inner cavity is formed in the inner shell, an exhaust pipe is arranged on the outer side of the inner shell, the exhaust pipe is communicated with the inner shell, and the inner silencing cotton is arranged on the inner wall of the inner shell. A groove is formed in the exhaust pipe, the pushing mechanism and the groove are sealed when the pushing mechanism moves, a plurality of elastic mechanisms penetrate through the air inlet pipe in the circumferential direction, one end of the pushing mechanism penetrates through the elastic mechanisms, a plurality of splice plates which form sealing with the inner shell are movably arranged on the inner shell, and one ends of the elastic mechanisms are connected with the splice plates. According to the fan silencer, automatic adjustment can be achieved according to different flow speeds of airflow entering different cavities in the fan silencer, manual operation is not needed, the airflow entering the fan silencer is adjusted in real time to enter the different cavities according to changes of the airflow entering the fan silencer, operation is convenient, and the silencing effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of mufflers, in particular to a fan muffler with a compressed air purge function. Background Art

[0002] A fan silencer with compressed air blowing function is a silencer device that has two functions: controlling the aerodynamic noise generated by the fan to the environment and blowing the dust-containing pipes. The air inlet pipe is installed on the fan, and the air outlet pipe is installed on the pipe that needs dust removal. The compressed air flow containing noise generated by the fan enters the fan silencer and diffuses and contacts with the silencer cotton to silence the noise. Then it is compressed again through the finer air outlet to blow the inside of the connected pipe to remove the dust inside the pipe.

[0003] The noise reduction effect of the fan muffler is affected by the size of the muffler cavity. The larger the cavity, the longer the propagation path of the noise in the cavity, the more times the sound is reflected, scattered and interfered in the cavity, and the better the noise reduction effect. However, the disadvantage is that the wind resistance of the airflow in the cavity is also greater. Therefore, in general, when the airflow generated by the fan entering the fan muffler is large, a fan muffler with a larger cavity is generally used. When the airflow generated by the fan entering the fan muffler is small, a fan muffler with a smaller cavity is generally used. Application No. 202321177460.2 discloses an impedance-type composite axial-flow fan muffler, which states that "the expansion chamber in the shell can be adjusted according to the parameters of the fan connected to the pipeline, especially the rotational speed. When adjusting the size of the expansion chamber, it is only necessary to manually screw the drive screw to drive the drive sleeve to move, and the corresponding two isolation plates can be connected. Under the linkage of the rod, the two isolation plates approach each other or move away from each other. When the two isolation plates approach each other, the volume of the expansion chamber formed between the isolation plates and the shell body decreases. On the contrary, when the two isolation plates move away from each other, the volume of the expansion chamber formed between the isolation plates and the shell body increases, thereby achieving the purpose of changing the volume of the expansion chamber. Although the above-mentioned prior art discloses that the expansion chamber, i.e., the chamber, can be changed, it can only be adjusted manually, which is very troublesome. In addition, since the fan is in the working environment, according to the changes in the conditions of the working environment, the fan will generally automatically adjust the speed with variable frequency. At this time, the air intake and wind speed of the fan entering the fan muffler will change accordingly. In order to achieve the best silencing effect without affecting the dust removal of the pipeline by the air outlet, it is necessary to adjust the chamber size of the fan muffler according to the air volume entering the fan muffler, but the above-mentioned prior art cannot adjust the chamber size in real time according to the size of the air intake. Summary of the invention

[0004] In order to solve the technical problems mentioned in the above background technology, the present invention provides a fan muffler with a compressed air purge function, and the technical solution adopted is as follows: The vents in the vents are provided with a plurality of air outlets, and the vents in the vents are provided with a plurality of air outlets.

[0005] Preferably, the pushing mechanism includes a front seal and a rear seal, the front seal is connected to the rear seal, the front seal includes a first sealing plate, a sliding seal is formed between the first sealing plate and the air inlet pipe, a cone is arranged on the first sealing plate, a top rod is arranged on the cone, the top rod passes through several elastic mechanisms, and the rear seal is arranged on the top rod.

[0006] Preferably, the rear seal includes a second sealing plate connected to the top rod, a push rod is provided on the second sealing plate, a first spring is provided on the push rod, one end of the first spring is connected to the second sealing plate, and the other end is connected to the right part of the air inlet duct, one end of the push rod passes through the right part of the air inlet duct and is connected to the third sealing plate, and the third sealing plate forms a seal with the groove when it moves.

[0007] Preferably, the elastic mechanism includes a sleeve arranged on the air inlet pipe, a slide plate arranged inside the sleeve, a support rod arranged on one side of the slide plate, a limit rod arranged on the other side, a second spring arranged on the support rod, one end of the second spring is connected to the slide plate, and the other end is connected to the sleeve, the limit rod movably passes through the air inlet pipe and forms a seal with the air inlet pipe, a limit block with a slope is arranged at one end of the limit rod, one end of the pushing mechanism passes through between the limit blocks, and the support rod is connected to the splicing plate.

[0008] Preferably, the outer sound-absorbing cotton and the inner sound-absorbing cotton are both polyester fiber sound-absorbing cotton.

[0009] Preferably, flanges are provided on both the air inlet pipe and the air outlet pipe.

[0010] The present invention has the following advantages: when the airflow entering the fan muffler is at a normal flow rate, the airflow enters the inner chamber through the air inlet pipe, the airflow contacts the inner silencer cotton, the noise in the airflow is silenced, and the silenced airflow enters the air outlet pipe through the exhaust pipe for discharge; when the airflow velocity entering the fan muffler is greater than the normal flow rate to a certain range, the airflow in the air inlet pipe pushes the pushing mechanism to move rightward, the pushing mechanism blocks the exhaust pipe on the one hand, and pushes the elastic mechanism to move outward on the other hand, the elastic mechanism drives the splicing plate to move outward, so that the inner shell body is opened, and the airflow in the inner chamber is silenced in the inner chamber and then enters the larger outer chamber through the inner shell body, and contacts and silences the outer silencer cotton with a larger diameter, so that the faster the airflow velocity, the greater the silencer intensity and the better the silencer effect, and then the airflow is discharged through the right part of the outer chamber through the air outlet pipe. The present invention can realize automatic adjustment for airflows entering different sized chambers in the fan muffler according to different flow rates, without manual operation, and can adjust to enter different chambers in real time according to the change of the airflow entering the fan muffler, which is convenient to operate and has a better silencer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural diagram of the present invention at normal flow rate; Figure 2 For the present invention Figure 1 Left section view of ; Figure 3 For the present invention Figure 2 A partial enlarged view of point a in the middle; Figure 4 This is a structural diagram of the present invention when the air flow velocity is greater than the normal flow velocity to a certain range; Figure 5 For the present invention Figure 4 Left section view of .

[0012] Figures: 1 shell, 2 outer silencer cotton, 3 air inlet pipe, 4 air outlet pipe, 5 partition, 6 inner shell, 7 inner silencer cotton, 8 inner chamber, 9 outer chamber, 10 air outlet hole, 11 exhaust pipe, 12 groove, 13 splicing plate, 14 first sealing plate, 15 cone, 16 push rod, 17 second sealing plate, 18 push rod, 19 first spring, 20 third sealing plate, 21 sleeve, 22 slide plate, 23 support rod, 24 limit rod, 25 second spring, 26 limit block, 27 flange. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0014] The present invention provides a fan muffler with a compressed air purge function, comprising an outer shell 1, an inner wall of the outer shell 1 is provided with an outer muffler cotton 2 for absorbing the noise of the airflow in the outer shell 1, an air inlet pipe 3 is provided on the left side of the outer shell 1, the air inlet pipe 3 is connected to the fan, the noise airflow generated by the fan enters the outer shell 1 through the air inlet pipe 3, an air outlet pipe 4 is provided on the right side of the outer shell 1, the airflow after muffler comes out through the air outlet pipe 4, a partition plate 5 is provided in the outer shell 1, an inner shell 6 is provided on the right side of the partition plate 5, the inner shell 6 is fixed on the partition plate 5, an inner muffler cotton 7 is provided on the inner wall of the inner shell 6, and the inner shell 6 is provided with an inner The air inlet pipe 3 is fixed to the partition plate 5, and a plurality of air outlet holes 10 are arranged on the air inlet pipe 3 located in the inner chamber 8. The air inlet pipe 3 enters the inner chamber 8 through the air outlet holes 10. A pushing mechanism is arranged on the right side of the air outlet holes 10 in the air inlet pipe 3, and a sliding seal is formed between the left and right ends of the pushing mechanism and the air inlet pipe 3. An exhaust pipe 11 is arranged on the outer side of the inner shell 6, and the exhaust pipe 11 is connected to the exhaust pipe 11. The inner shell 6 is connected, and a groove 12 is provided in the exhaust pipe 11. When the pushing mechanism moves, it forms a seal with the groove 12. A plurality of elastic mechanisms are penetrated along the circumferential direction on the air inlet pipe 3. One end of the pushing mechanism passes through the plurality of elastic mechanisms. A plurality of splicing plates 13 that form a seal with the inner shell 6 are movably provided on the inner shell 6. One end of the elastic mechanism is connected to the splicing plate 13. When the airflow entering the fan muffler is at a normal flow rate, the airflow enters the inner chamber 8 through the air inlet pipe 3, and the airflow contacts the internal silencer cotton 7. The noise in the airflow is silenced, and the silenced airflow enters the air outlet pipe 4 through the exhaust pipe 11 and is discharged ; When the air flow rate entering the fan muffler is greater than the normal flow rate to a certain range, the air flow in the air inlet pipe 3 pushes the pushing mechanism to move to the right. On the one hand, the pushing mechanism blocks the exhaust pipe 11, and on the other hand, it pushes the elastic mechanism to move outward. The elastic mechanism drives the splicing plate 13 to move outward, so that the inner shell 6 opens, and the air flow in the inner chamber 8 is silenced in the inner chamber 8 and then enters the larger outer chamber 9 through the inner shell 6, and contacts with the outer silencer cotton 2 with a larger diameter for silencer, so that the faster the air flow rate, the greater the silencer intensity and the better the silencer effect. Then, the air flow passes through the right part of the outer chamber 9 and is discharged through the air outlet pipe 4.

[0015] The pushing mechanism includes a front seal and a rear seal, the front seal is connected to the rear seal, the front seal includes a first sealing plate 14, a sliding seal is formed between the first sealing plate 14 and the air inlet pipe 3, a cone 15 is arranged on the first sealing plate 14, a top rod 16 is arranged on the cone 15, the top rod 16 passes through several elastic mechanisms, and a rear seal is arranged on the top rod 16. When the airflow with normal flow rate enters the air inlet pipe 3, the airflow is discharged through the air outlet 10 and cannot push the first sealing plate 14. When the airflow velocity is greater than the normal flow rate to a certain range, in addition to being discharged through the air outlet 10, the airflow pushes the first sealing plate 14 to move to the right under the action of air pressure, the first sealing plate 14 drives the cone 15, the cone 15 drives the top rod 16, and the top rod 16 pushes the rear seal.

[0016] The rear seal includes a second sealing plate 17 connected to the push rod 16, a push rod 18 is arranged on the second sealing plate 17, a first spring 19 is arranged on the push rod 18, one end of the first spring 19 is connected to the second sealing plate 17, and the other end is connected to the right part of the air inlet pipe 3, one end of the push rod 18 passes through the right part of the air inlet pipe 3 and is connected to the third sealing plate 20, and the third sealing plate 20 forms a seal with the groove 12 when moving, the push rod 16 drives the second sealing plate 17 to move to the right, the second sealing plate 17 drives the push rod 18 and the third sealing plate 20 to move, the first spring 19 is compressed, and the third sealing plate 20 enters the groove 12 to seal the exhaust pipe 11.

[0017] The elastic mechanism includes a sleeve 21 arranged on the air inlet pipe 3, a slide plate 22 is arranged in the sleeve 21, a support rod 23 is arranged on one side of the slide plate 22, and a limit rod 24 is arranged on the other side. A second spring 25 is arranged on the support rod 23, one end of the second spring 25 is connected to the slide plate 22, and the other end is connected to the sleeve 21. The limit rod 24 movably penetrates the air inlet pipe 3 and forms a seal with the air inlet pipe 3. A limit block 26 with a slope is arranged at one end of the limit rod 24, one end of the pushing mechanism passes between the limit blocks 26, and the support rod 23 is connected to the splicing plate 13. When the cone 15 moves to the right, the cone 15 pushes each limit block 26 outward, and the push block 26 drives the limit rod 24, the slide plate 22, and the support rod 23 to move outward. The second spring 25 is compressed, and the support rod 23 drives the splicing plate 13 to move outward, so that the splicing plate 13 originally spliced ​​on the inner shell 6 to form a seal with the inner shell 6 moves into the outer chamber 9, and the inner shell 6 opens.

[0018] The outer sound-absorbing cotton 2 and the inner sound-absorbing cotton 7 are both polyester fiber sound-absorbing cotton, which has the characteristics of wear resistance and high temperature resistance.

[0019] Flanges 27 are provided on both the air inlet pipe 3 and the air outlet pipe 4, through which the air inlet pipe 3 is connected to the fan and the air outlet pipe 4 is connected to the pipeline that needs to be dust-removed.

[0020] Working principle of the present invention: Please refer to Figure 1-3 When the airflow at a normal flow rate generated by the fan enters the air inlet pipe 3, the air pressure is not enough to push the first sealing plate 14, and the first sealing plate 14 does not move. The airflow in the air inlet pipe 3 enters the inner chamber 8 through the air outlet hole 10, contacts the internal silencer cotton on the inner shell 6, eliminates the noise in the airflow, and then comes out through the exhaust pipe 11, and is compressed and discharged through the air outlet pipe 4, and the connected pipes that need to be dusted are purged and dusted.

[0021] Please refer to Figure 4-5 When the airflow velocity generated by the fan is greater than the normal flow velocity and enters the air inlet pipe 3 within a certain range, under the action of high air pressure, the airflow pushes the first sealing plate 14 to move to the right, and the first sealing plate 14 drives the cone 15, the top rod 16, the second sealing plate 17, the push rod 18, and the third sealing plate 20 to move to the right, until the third sealing plate 20 enters the groove 12 to seal the exhaust pipe 11, and the first spring 19 is compressed. At the same time, the cone 15 pushes the limit block 26 to move outward, and the limit block 26 drives the limit rod 24, the slide plate 22, the support The rod 23 and the splicing plate 13 move outward, the second spring 25 is compressed, the splicing plate 13 enters the outer chamber 9, the splicing plate 13 is separated from the inner shell 6, the inner shell 6 is opened, and the airflow in the air inlet pipe 3 passes through the air outlet 10, first enters the inner chamber 8, and contacts with the inner silencer cotton 7, first eliminates part of the noise in the airflow, and then enters the outer chamber 9 through the inner shell 6, expanding the space for the airflow to pass through, and contacts with the outer silencer cotton 2 with a larger diameter, further eliminating the noise in the airflow, and then comes out from the right part of the outer chamber 9 and is discharged through the air outlet pipe 4.

[0022] The present invention is simple to operate, convenient to use, and suitable for comprehensive promotion and application. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fan muffler with a compressed air purge function, comprising an outer shell (1), an inner wall of the outer shell (1) is provided with an external muffler cotton (2), an air inlet pipe (3) is provided on the left side of the outer shell (1), and an air outlet pipe (4) is provided on the right side of the outer shell (1), characterized in that: A partition (5) is arranged inside the outer shell (1), an inner shell (6) is arranged on the right side of the partition (5), an inner sound-absorbing cotton (7) is arranged on the inner wall of the inner shell (6), an inner chamber (8) is arranged inside the inner shell (6), an outer chamber (9) is arranged between the inner shell (6) and the outer shell (1), an air inlet pipe (3) passes through the partition (5) and extends into the inner chamber (8), a plurality of air outlet holes (10) are arranged on the air inlet pipe (3) at a portion located in the inner chamber (8), a pushing mechanism is arranged inside the air inlet pipe (3) at the right side of the air outlet hole (10), and both left and right ends of the pushing mechanism are A sliding seal is formed between the air inlet pipe (3), an exhaust pipe (11) is arranged on the outer side of the inner shell (6), the exhaust pipe (11) is connected to the inner shell (6), a groove (12) is arranged in the exhaust pipe (11), and a seal is formed between the groove (12) when the pushing mechanism moves, a plurality of elastic mechanisms are passed through the air inlet pipe (3) along the circumferential direction, one end of the pushing mechanism passes through between the plurality of elastic mechanisms, a plurality of splicing plates (13) are movably arranged on the inner shell (6) to form a seal with the inner shell (6), and one end of the elastic mechanism is connected to the splicing plate (13).

2. A fan muffler with compressed air purge function according to claim 1, characterized in that: The pushing mechanism comprises a front sealing member and a rear sealing member, the front sealing member is connected to the rear sealing member, the front sealing member comprises a first sealing plate (14), a sliding seal is formed between the first sealing plate (14) and the air inlet pipe (3), a cone (15) is arranged on the first sealing plate (14), a push rod (16) is arranged on the cone (15), the push rod (16) passes through a plurality of elastic mechanisms, and the rear sealing member is arranged on the push rod (16).

3. A fan muffler with compressed air purge function according to claim 2, characterized in that: The rear sealing member comprises a second sealing plate (17) connected to the push rod (16); a push rod (18) is arranged on the second sealing plate (17); a first spring (19) is arranged on the push rod (18); one end of the first spring (19) is connected to the second sealing plate (17) and the other end is connected to the right part of the air inlet pipe (3); one end of the push rod (18) passes through the right part of the air inlet pipe (3) and is connected to the third sealing plate (20); the third sealing plate (20) forms a seal with the groove (12) when moving.

4. The fan muffler with compressed air purge function according to claim 1, characterized in that: The elastic mechanism comprises a sleeve (21) arranged on the air inlet pipe (3), a slide plate (22) being arranged in the sleeve (21), a support rod (23) being arranged on one side of the slide plate (22) and a limit rod (24) being arranged on the other side, a second spring (25) being arranged on the support rod (23), one end of the second spring (25) being connected to the slide plate (22) and the other end being connected to the sleeve (21), the limit rod (24) movably passing through the air inlet pipe (3) and forming a seal with the air inlet pipe (3), a limit block (26) with a slope being arranged at one end of the limit rod (24), one end of the pushing mechanism passing through between the limit blocks (26), and the support rod (23) being connected to the splicing plate (13).

5. The fan muffler with compressed air purge function according to claim 1, characterized in that: The outer sound-absorbing cotton (2) and the inner sound-absorbing cotton (7) are both polyester fiber sound-absorbing cotton.

6. The fan muffler with compressed air purge function according to claim 1, characterized in that: Flanges (27) are provided on the air inlet pipe (3) and the air outlet pipe (4).

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