An explosion-proof low-noise fan box

Abstract

The present invention belongs to the technical field of centrifugal fans, and specifically relates to an explosion-proof low-noise fan box, comprising a silencer housing, a volute-free centrifugal fan, and a smoke concentration detector. The volute-free centrifugal fan is provided at the position corresponding to the air inlet of the silencer housing, the internal cavity of the silencer housing is square, and an array of spoilers is provided inside the side of the silencer housing away from the air filter. The spoilers are used to drive the airflow in the silencer housing to rotate. A guide cylinder is provided on the outer side of the volute-free centrifugal fan, which is used to constrain the airflow generated by the volute-free centrifugal fan. The spoilers include guide blocks, which are placed at the corners of the inner wall of the silencer housing, and the end faces of each guide block are connected. The guide blocks are provided with guide sliding surfaces. The present invention can disrupt the uniform distribution of dust by artificially creating vortices, forming areas of alternating high and low concentrations, thereby reducing the probability of reaching an overall explosion concentration.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal fans, and particularly relates to an explosion-proof and low-noise fan box. Background Art

[0002] With increasing demands for industrial safety and production safety, demand for explosion-proof, low-noise fan enclosures is growing in flammable and explosive environments such as the petroleum, chemical, pharmaceutical, and laboratory industries. Traditional fans are prone to generating sparks or high temperatures during operation, posing a risk of detonating flammable gases or dust. Furthermore, noise pollution from ordinary fans can affect the working environment and even endanger personnel health. Therefore, specialized fan enclosures that combine explosion-proof technology with low-noise designs have become a key development direction in the industrial ventilation field.

[0003] The patent with announcement number CN112797008A discloses an explosion-proof fan, including a base, a fan fixed on the base, a first motor fixed on the base for driving the fan, a cooling device provided on the base for cooling the first motor, and a control switch provided on the cooling device. The cooperation between the first motor and the second motor drives multiple blades to rotate, so that the blades run more stably during the revolution, and the generated wind movement reduces the vibration of the blades, greatly reducing the noise of the fan. When working in a flammable environment, an explosion occurs, and the first motor is further controlled by the control switch to improve the safety of the overall fan. However, the device cannot actively prevent the explosion problem, and there are certain safety hazards in actual use. Therefore, a centrifugal fan that uses centrifugal force to destroy the uniformity of smoke is proposed to address the problem of high-gas extraction of smoke. Summary of the Invention

[0004] The purpose of the present invention is to provide an explosion-proof low-noise fan box, which can destroy the uniform distribution of dust by artificially creating eddies, forming areas of alternating local high and low concentrations, thereby reducing the overall probability of reaching explosive concentrations.

[0005] The technical solutions adopted by the present invention are as follows:

[0006] An explosion-proof low-noise fan box includes a silencer housing, a volute-less centrifugal fan, and a smoke concentration detector. The volute-less centrifugal fan is provided at the position of the silencer housing corresponding to the air inlet. The internal cavity of the silencer housing is square. An array of spoilers is provided inside the silencer housing on a side away from the air filter. The spoilers are used to drive the airflow in the silencer housing to rotate.

[0007] A guide cylinder is provided on the outer side of the volute-less centrifugal fan, and the guide cylinder is used to restrict the airflow generated by the volute-less centrifugal fan during operation;

[0008] The spoiler device includes a guide block and a rotating airflow outlet. The guide block is placed at the corner of the inner wall of the silencer housing, and the end faces of each guide block are connected. The guide block is provided with a guide sliding surface. The guide sliding surface makes the two ends of the guide block corner have a height difference. The higher corner end face is provided with the rotating airflow outlet. A volute centrifugal fan is provided inside the guide block, and the air outlet of the volute centrifugal fan is connected to the rotating airflow outlet.

[0009] The rotation of the volute centrifugal fan drives the air flow to enter from one end of the guide block and be discharged from the rotating air flow outlet. Under the guidance of the arc surface of the guide sliding surface, the air flow rotates in the quasi-circular cavity formed by the spoiler, thereby stirring up the dust in the flue gas in the silencer shell and reducing the risk of explosion.

[0010] A reinforcement plate is provided on one side of the guide block, one end of the volute centrifugal fan is rotatably connected to the reinforcement plate, one end of the volute centrifugal fan protruding from the reinforcement plate is fixedly connected to a transmission wheel, each of the transmission wheels is connected by a transmission belt, a second stepper motor is fixedly connected in the silencer housing, and the second stepper motor is connected to one of the volute centrifugal fans through a coupling;

[0011] An air filter is provided on the silencer housing, the air filter is communicated with the air inlet of the volute centrifugal fan, and the air filter is used to filter the air;

[0012] The guide cylinder includes a guide shell and spiral blades. The guide shell is sleeved on the outside of the centrifugal fan without volute. The inner wall of the guide shell is provided with spiral blades corresponding to the position of the motor of the centrifugal fan without volute. The spiral blades are used to guide the airflow.

[0013] The middle part of the spoiler is rotatably connected to a spiral dust cleaning device, and the spiral dust cleaning device is used to clean the dust on the inner wall of the spoiler;

[0014] The spiral dust cleaning device includes a sleeve and a rotating shaft. The rotating shaft is rotatably connected in the sleeve. A plurality of equally spaced reels are fixedly connected to the rotating shaft. A scraping strip is fixedly connected to the reel. The scraping strip passes through the sleeve and extends outside the sleeve. The end of the scraping strip away from the sleeve is fixedly connected to a fitting block.

[0015] The end of the fitting block is a flexible cloth, and the flexible cloth can be in contact with the outer wall of the guide sliding surface.

[0016] One side of the spoiler is fixedly connected to a ventilation frame, the middle part of the ventilation frame is rotatably connected to a sleeve, and the outer end of the sleeve away from the volute-free centrifugal fan is fixedly connected to a fan.

[0017] One end of the rotating shaft extends out of the end surface of the sleeve and is fixedly connected to a ratchet;

[0018] The outer side of the coupling is fixedly connected to a shaft sleeve, two sliding sleeves are slidably connected to the shaft sleeve, an elastic sleeve is fixedly connected between the sliding sleeves, and a counterweight ball is arranged in the cavity formed by the sliding sleeve and the elastic sleeve;

[0019] A synchronization device is provided between the silencer housing and the coupling, and the synchronization device includes a shaft sleeve and a rocker rod;

[0020] A swing rod 1 is hinged inside the muffler housing, the swing rod 1 corresponds to the ratchet position, and a latching tooth is provided at the corresponding position, and the end of the swing rod 1 away from the hinge shaft contacts the elastic sleeve;

[0021] A waist-shaped groove is provided on the rocker arm, a control rod is fixedly connected to the silencer shell, a slider on the control rod is slidably connected in the waist-shaped groove, a limit spring is provided on the outer side of the control rod, and the limit spring supports the waist-shaped groove close to the elastic sleeve.

[0022] The air outlet of the silencer housing is provided with a silencer device, which is used to silence the output airflow;

[0023] The silencer device includes a silencer channel 1 and a silencer channel 2. The silencer channel 1 is connected to the silencer housing. The silencer channel 1 and the silencer channel 2 are arranged correspondingly. The silencer channel 1 and the silencer channel 2 are honeycomb-shaped.

[0024] The outer side of the silencer housing is connected to a pressure relief channel, and two sets of bursting discs with different thresholds are arranged in the pressure relief channel. The bursting disc close to the spoiler has a lower threshold than the other bursting disc, and a closed cavity is formed between the bursting discs.

[0025] There are multiple support sheets distributed in an array on the outside of the support sleeve, and an annular airbag is connected to the outside of the support sleeve. The support sheet fits tightly with the outer wall of the support sleeve under the support of the annular airbag. The silencer channel and the support sleeve are made of elastic material.

[0026] The annular airbag is connected to the bursting disc through a closed cavity formed by a pipe.

[0027] A flow blocking device is provided in the muffler housing, and the flow blocking device is used to clean dust from the air filter;

[0028] The flow blocking device includes a stepper motor 1 and a swing rod 2. The swing rod 2 is hinged at a position corresponding to the air outlet inside the silencer housing. A folded cloth is fixedly connected to one side of the swing rod 2, and the other end of the folded cloth is fixedly connected to the inner wall of the silencer housing.

[0029] The stepper motor 1 is used to drive the swing rod 2 to swing.

[0030] The technical effects achieved by the present invention are:

[0031] The present invention forms an airflow rotating around the quasi-circular axis in the quasi-circular space formed by the turbulence device. When the gas drawn in by the voluteless centrifugal fan enters the working space of the turbulence device, it will drive the drawn-in gas to rotate. As a result, the smoke particles in the drawn-in gas are affected by the centrifugal force of the rotating airflow, causing the smoke concentration in the quasi-circular space of the turbulence device to be unevenly distributed, thereby reducing the probability of high-concentration smoke explosion.

[0032] In the present invention, the rotating airflow generated by the operation of the spoiler will cause a lot of dust to adhere to the surface of the guide sliding surface. If it accumulates for a long time, it will affect the working effect of the spoiler. Therefore, the dust adhering to the surface of the guide sliding surface is swept away by the rotation of the scraping strip to avoid the accumulation of dust on the surface of the guide sliding surface, thereby ensuring that the working effect of the spoiler is not affected.

[0033] According to the present invention, when an explosion occurs in the silencer shell, the instantaneous air pressure generated in the silencer shell will break the blasting discs. At this time, the closed environment between the blasting discs is broken, the gas in the annular airbag has a flow direction, and the support of the annular airbag is reduced. At this time, the silencer channel 1 is deformed under the impact of the high-speed airflow, and the end of the silencer channel 2 is blocked to a certain extent, thereby preventing the explosion from having a greater impact on subsequent machines connected to the silencer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 The present invention Figure 1 A schematic diagram of a partial cross-sectional structure;

[0036] Figure 3 The present invention Figure 1 Schematic diagram of the half-section structure;

[0037] Figure 4 It is a structural schematic diagram of the volute-less centrifugal fan and adjacent components in the present invention;

[0038] Figure 5 Schematic diagram of the structure of the spoiler device in the present invention;

[0039] Figure 6 The present invention Figure 5 Schematic diagram of the reverse structure;

[0040] Figure 7 This is a schematic structural diagram of the spiral dust cleaning device in the present invention;

[0041] Figure 8 The present invention Figure 7Schematic diagram of the reverse structure;

[0042] Figure 9 It is a structural diagram of the synchronization device in the present invention;

[0043] Figure 10 Schematic diagram of a half-section structure of the shaft sleeve in the present invention;

[0044] Figure 11 The present invention Figure 3 Schematic diagram of the structure of area B;

[0045] Figure 12 The present invention Figure 2 Schematic diagram of the structure of area A;

[0046] Figure 13 It is a structural schematic diagram of the flow blocking device in the present invention.

[0047] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0048] 1. Silencer housing; 2. Air filter;

[0049] 3. Silencing device; 301. Silencing channel 1; 302. Silencing channel 2; 303. Support plate; 304. Annular airbag; 305. Pipe; 306. Pressure relief channel; 307. Bursting disc; 308. Support sleeve;

[0050] 4. Flow spoiler; 401. Guide block; 402. Rotating airflow outlet; 403. Volute centrifugal fan; 404. Guide sliding surface; 406. Drive wheel; 407. Drive belt;

[0051] 5. Diversion cylinder; 501. Diversion shell; 502. Spiral blade;

[0052] 6. Spiral dust removal device; 601. Sleeve; 602. Scroll; 603. Scraping strip; 604. Mounting block; 605. Rotating shaft; 606. Ratchet; 607. Fan;

[0053] 7. Synchronizing device; 701. Rocker arm 1; 702. Kidney-shaped groove; 703. Gear; 704. Control rod; 705. Limit spring; 706. Bushing; 707. Sliding sleeve; 708. Elastic sleeve; 709. Counterweight ball;

[0054] 8. Flow blocking device; 801. Stepper motor 1; 802. Rocker rod 2; 803. Folding cloth;

[0055] 9. Ventilation rack; 10. Coupling; 11. Stepper motor 2; 12. Centrifugal fan without volute. DETAILED DESCRIPTION

[0056] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following examples. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention.

[0057] like Figures 1 to 13 As shown, an explosion-proof low-noise fan box includes a silencer housing 1, a volute-free centrifugal fan 12, and a smoke concentration detector. The volute-free centrifugal fan 12 is provided at the position corresponding to the air inlet of the silencer housing 1. The internal cavity of the silencer housing 1 is square. An array of spoilers 4 is provided inside the side of the silencer housing 1 away from the air filter 2. The spoilers 4 are used to drive the airflow in the silencer housing 1 to rotate.

[0058] A guide cylinder 5 is provided on the outer side of the volute-less centrifugal fan 12, and the guide cylinder 5 is used to restrict the airflow generated by the volute-less centrifugal fan 12 during operation;

[0059] The spoiler 4 includes a guide block 401, which is placed at the corner of the inner wall of the silencer housing 1, and the end faces of each guide block 401 are connected. The guide block 401 is provided with a guide sliding surface 404. The guide sliding surface 404 creates a height difference between the two ends of the guide block 401 corner. The higher corner end face is provided with a rotating airflow outlet 402. A volute centrifugal fan 403 is provided inside the guide block 401, and the air outlet of the volute centrifugal fan 403 is connected to the rotating airflow outlet 402;

[0060] The rotation of the volute centrifugal fan 403 drives the air flow to enter from one end of the guide block 401 and be discharged from the rotating air flow outlet 402. Under the guidance of the arc surface of the guide sliding surface 404, the air flow rotates in the quasi-circular cavity formed by the spoiler 4, thereby stirring up the dust in the smoke in the silencer housing 1 and reducing the risk of explosion.

[0061] Furthermore, the gas flowing into the volute centrifugal fan 403 is filtered gas, and the airflow input by the volute centrifugal fan 403 can further dilute the dust concentration inside the silencer housing 1.

[0062] Furthermore, an inert gas tank and a combustible detector may be provided in the silencer housing 1. When the combustible detector detects an explosion risk, the inert gas may be output from the rotating air flow outlet 402 to dilute the concentration of the combustible in the silencer housing 1 and avoid explosion.

[0063] Furthermore, a volute-shaped groove is opened inside the guide block 401 , and the centrifugal fan is placed in the volute-shaped groove, thereby forming a volute centrifugal fan 403 .

[0064] Furthermore, a dust filter is provided on the outer side of the rotating airflow outlet 402 .

[0065] Furthermore, the guide cylinder 5 includes a guide shell 501 and a spiral blade 502. The guide shell 501 is mounted on the outside of the centrifugal fan 12 without a volute. The inner wall of the guide shell 501 is provided with a spiral blade 502 corresponding to the motor position of the centrifugal fan 12 without a volute. The spiral blade 502 is used to guide the airflow, making it easier for the airflow to rotate.

[0066] According to the above structure, when the volute centrifugal fan 403 is working, the volute centrifugal fan 403 draws the air flow into the guide block 401 and discharges it through the rotating air flow outlet 402. At this time, the air flow is guided by the guide sliding surface 404 and flows to the rotating air flow outlet 402 adjacent to the guide block 401. Since an air flow rotating around the quasi-circular axis is formed in the quasi-circular space formed by the spoiler 4, when the gas drawn in by the non-volute centrifugal fan 12 enters the working space of the spoiler 4, it will drive the drawn-in gas to rotate. As a result, the smoke particles in the drawn-in gas are subjected to the centrifugal force of the rotating airflow, making the smoke concentration in the quasi-circular space of the spoiler 4 unevenly distributed, thereby reducing the probability of high-concentration smoke explosion.

[0067] Refer to the attached Figure 6 A reinforcement plate is provided on one side of the guide block 401, one end of the volute centrifugal fan 403 is rotatably connected to the reinforcement plate, and one end of the volute centrifugal fan 403 protruding from the reinforcement plate is fixedly connected to a transmission wheel 406, and each transmission wheel 406 is connected by a transmission belt 407. A stepper motor 2 11 is fixedly connected to the silencer housing 1, and the stepper motor 2 11 is connected to one of the volute centrifugal fans 403 through a coupling 10.

[0068] An air filter 2 is provided on the silencer housing 1 , and the air filter 2 is communicated with the air inlet of the volute centrifugal fan 403 , and the air filter 2 is used for filtering air.

[0069] Furthermore, a through hole is provided on a side of the guide block 401 away from the reinforcement plate for inputting airflow when the volute centrifugal fan 403 is in operation.

[0070] Furthermore, the transmission belt 407 is a ruler belt.

[0071] Furthermore, when the smoke concentration detector detects that the smoke concentration is high, the stepping motor 11 is driven to work and stops after the smoke concentration decreases.

[0072] According to the above structure, the volute centrifugal fan 403 is driven to rotate by the stepper motor 2 11, and all the volute centrifugal fans 403 are driven to work at the same speed by the transmission belt 407, thereby ensuring the stability of the rotating airflow in the pseudo-circular space of the spoiler 4;

[0073] When the volute centrifugal fan 403 rotates, the air pressure in the middle cavity of the volute centrifugal fan 403 increases with the rotation of the centrifugal fan, so that negative pressure is generated in the middle of the volute centrifugal fan 403, thereby drawing the outside air through the air filter 2 into the guide block 401, and the rotating air flow outlet 402 is discharged into the silencer housing 1. The filtered outside air can also dilute the smoke and dust gas in the silencer housing 1, further reducing the probability of explosion.

[0074] Refer to the attached Figure 7 and attached Figure 8 The middle part of the flow-turbulating device 4 is rotatably connected to a spiral dust-cleaning device 6, which is used to clean the dust on the inner wall of the flow-turbulating device 4;

[0075] The spiral dust cleaning device 6 includes a sleeve 601 and a rotating shaft 605. The rotating shaft 605 is rotatably connected to the sleeve 601. A plurality of equally spaced reels 602 are fixedly connected to the rotating shaft 605. The reels 602 are fixedly connected to scraping strips 603. The scraping strips 603 extend through the sleeve 601 and extend outside the sleeve 601. The end of the scraping strips 603 away from the sleeve 601 is fixedly connected to a mounting block 604.

[0076] The end of the fitting block 604 is made of flexible fabric, which can contact the outer wall of the guide sliding surface 404 .

[0077] Furthermore, the rotation of the sleeve 601 drives the scraping strip 603 to rotate. At this time, the fitting block 604 causes the end of the scraping strip 603 to contact the surface of the guide sliding surface 404 under the action of centrifugal force.

[0078] According to the above structure, the rotating airflow generated by the operation of the spoiler 4 will cause a lot of dust to adhere to the surface of the guide sliding surface 404. If the dust accumulates for a long time, it will affect the working effect of the spoiler 4. Therefore, the scraping strip 603 rotates to wipe the dust adhered to the surface of the guide sliding surface 404 to prevent the dust from accumulating on the surface of the guide sliding surface 404, thereby affecting the working effect of the spoiler 4.

[0079] One side of the spoiler 4 is fixedly connected to a ventilation frame 9, the middle of the ventilation frame 9 is rotatably connected to a sleeve 601, and the outer end of the sleeve 601 away from the voluteless centrifugal fan 12 is fixedly connected to a fan 607.

[0080] According to the above structure, when the air flow drawn in by the voluteless centrifugal fan 12 flows from the air inlet end to the air outlet end, the flow of the air flow will drive the fan 607 to rotate and synchronously drive the sleeve 601 to rotate, thereby cleaning the surface of the guide sliding surface 404.

[0081] Refer to the attached Figure 9 To the attached Figure 11One end of the rotating shaft 605 extends out of the end surface of the sleeve 601 and is fixedly connected to the ratchet 606;

[0082] A synchronization device 7 is provided between the silencer housing 1 and the coupling 10, and the synchronization device 7 includes a shaft sleeve 706 and a rocker arm 701;

[0083] A shaft sleeve 706 is fixedly connected to the outer side of the coupling 10, and two sliding sleeves 707 are slidably connected to the shaft sleeve 706. An elastic sleeve 708 is fixedly connected between the sliding sleeves 707. A counterweight ball 709 is set in the cavity formed by the sliding sleeves 707 and the elastic sleeves 708.

[0084] A swing rod 701 is hinged inside the silencer housing 1. The swing rod 701 corresponds to the ratchet 606, and a latching tooth 703 is provided at the corresponding position. The end of the swing rod 701 away from the hinge axis contacts the elastic sleeve 708.

[0085] A waist-shaped groove 702 is provided on the rocker arm 701, and a control rod 704 is fixedly connected to the silencer housing 1. The slider on the control rod 704 is slidably connected in the waist-shaped groove 702. A limit spring 705 is provided on the outer side of the control rod 704, and the limit spring 705 supports the waist-shaped groove 702 close to the elastic sleeve 708.

[0086] Furthermore, a limit block is provided on the control rod 704 to limit the swing angle of the latching tooth 703 .

[0087] Furthermore, the scraping strip 603 can be wound on the outer wall of the reel 602 . When the scraping strip 603 is wound on the reel 602 , the fitting block 604 contacts the outer wall of the sleeve 601 .

[0088] According to the above structure, when the stepper motor 11 is working, the coupling 10 and the shaft sleeve 706 will rotate synchronously and rapidly. At this time, the counterweight ball 709 on the shaft sleeve 706 supports the elastic sleeve 708 to protrude outward under the action of centrifugal force and contact the kidney-shaped groove 702, causing the kidney-shaped groove 702 to swing downward. At this time, the latch tooth 703 contacts the ratchet 606 and limits the ratchet 606. At this time, the rotating shaft 605 does not rotate under the restriction of the ratchet 606, and the sleeve 601 continues to rotate under the operation of the fan 607. At this time, the scraper strip 603 is gradually wound around the outer side of the reel 602, thereby preventing the scraper strip 603 from affecting the rotating airflow in the spoiler 4 when the spoiler 4 is working;

[0089] When the stepper motor 11 is not working, the waist-shaped groove 702, supported by the limit spring 705, causes the latch tooth 703 to disengage from the ratchet 606. At this time, the sleeve 601 rotates under the operation of the ratchet 606. As the rotation speed of the fan 607 increases, the mounting block 604 pulls the scraping strip 603 outward from the sleeve 601 under the action of centrifugal force, and cleans the surface of the guide sliding surface 404 after operation to ensure the working effect of the spoiler 4.

[0090] Refer to the attached Figure 2 and attached Figure 12 The air outlet of the silencer housing 1 is provided with a silencer 3, which is used to silence the output airflow;

[0091] The silencer device 3 includes a silencer channel 1 301 and a silencer channel 2 302 . The silencer channel 1 301 is connected to the silencer housing 1 . The silencer channel 1 301 and the silencer channel 2 302 are correspondingly arranged. The silencer channel 1 301 and the silencer channel 2 302 are honeycomb-shaped.

[0092] According to the above structure, the flowing airflow is silenced through the honeycomb-shaped silencer channel 1 301 and the silencer channel 2 302 .

[0093] The outside of the silencer housing 1 is connected to a pressure relief channel 306. Two sets of bursting discs 307 with different thresholds are installed in the pressure relief channel 306. The bursting disc 307 on the side close to the spoiler 4 has a lower threshold than the other bursting disc 307. A closed cavity is formed between the bursting discs 307.

[0094] There are multiple support sheets 303 distributed in an array on the outside of the support sleeve 308. The outer side of the support sleeve 308 is connected with an annular airbag 304. The support sheet 303 fits tightly with the outer wall of the support sleeve 308 under the support of the annular airbag 304. The silencer channel 301 and the support sleeve 308 are made of elastic material.

[0095] The annular airbag 304 is connected to the bursting disc 307 through a closed cavity formed by the pipe 305 .

[0096] Furthermore, the support sheet 303 is a plastic sheet used to enhance the support of the annular airbag 304 .

[0097] Furthermore, a plurality of guide bumps on the same side of the silencer channel 1 301 close to the spoiler 4 can be provided. When the high airflow impacts the end face of the silencer channel 1 301, it is easier to make the inclination of the silencer channel 1 301 to block the end of the silencer channel 2 302.

[0098] Furthermore, the muffler channel 301 and the support sleeve 308 can be made of rubber material.

[0099] According to the above structure, when an explosion occurs in the silencer housing 1, the instantaneous air pressure generated in the silencer housing 1 will break the bursting disc 307. At this time, the closed environment between the bursting disc 307 is broken, and the gas in the annular airbag 304 has a flow direction. The support of the annular airbag 304 is reduced. At this time, the silencer channel 1 301 is deformed under the impact of the high-speed airflow and the end of the silencer channel 2 302 is blocked to a certain extent, thereby preventing the explosion from having a significant impact on subsequent machines connected to the silencer housing 1.

[0100] At the same time, after the silencer channel 1 301 is blocked, the high pressure in the silencer housing 1 is discharged to the outside air through the pressure relief channel 306 .

[0101] A flow blocking device 8 is provided in the silencer housing 1, and the flow blocking device 8 is used to clean the dust from the air filter 2;

[0102] Refer to the attached Figure 13 The flow blocking device 8 includes a stepper motor 1 801 and a second swing rod 802. The second swing rod 802 is hinged at the position corresponding to the air outlet inside the silencer housing 1. A folding cloth 803 is fixedly connected to one side of the second swing rod 802. The other end of the folding cloth 803 is fixedly connected to the inner wall of the silencer housing 1.

[0103] The stepper motor 1 801 is used to drive the swing rod 2 802 to swing.

[0104] Furthermore, a spring and a spoiler fixedly connected to the spring can be provided in the air filter 2. When the airflow flows through the spoiler, the spring is driven to swing. The vibration generated by the swinging of the spring improves the cleaning effect of the dust on the surface of the air filter 2.

[0105] According to the above structure, by regularly starting the stepper motor 1 801 to work, driving the rocker arm 2 802 to swing, and stretching the folded cloth 803 to unfold, the air outlet of the silencer housing 1 is partially blocked. At this time, the reduction of the air outlet will increase the air pressure in the silencer housing 1. At this time, the airflow in the silencer housing 1 will be discharged to the outside of the silencer housing 1 through the rotating airflow outlet 402, the volute centrifugal fan 403, and the air filter 2. The filter on the surface of the air filter 2 is flushed by the reverse airflow generated to ensure the working effect of the air filter 2.

[0106] The working principle of the present invention is as follows: when the smoke concentration detector detects that the smoke concentration is high, the stepper motor 11 is driven to work, and the volute centrifugal fan 403 is driven to rotate by the stepper motor 11, and all the volute centrifugal fans 403 are driven to work at the same speed through the transmission belt 407. When the volute centrifugal fan 403 is working, the volute centrifugal fan 403 draws the air into the guide block 401 and discharges it through the rotating air flow outlet 402. At this time, the air flow is guided by the guide sliding surface 404 and flows to the rotating air flow outlet 402 adjacent to the guide block 401. Since an air flow rotating around the quasi-circular axis is formed in the quasi-circular space formed by the spoiler 4, when the gas drawn in by the non-volute centrifugal fan 12 enters the working space of the spoiler 4, it will drive the drawn-in gas to rotate, thereby causing the smoke particles in the drawn-in gas to be unevenly distributed under the action of the centrifugal force of the rotating air flow, resulting in the smoke concentration in the elliptical space of the spoiler 4 being unevenly distributed.

[0107] When the smoke concentration reaches a certain level, the stepper motor 11 stops working. At this time, the waist-shaped groove 702, supported by the limit spring 705, causes the latch 703 to disengage from the ratchet 606. At this time, the sleeve 601 rotates under the action of the ratchet 606. As the rotation speed of the fan 607 increases, the mounting block 604 pulls the scraping strip 603 outward from the sleeve 601 under the action of centrifugal force, and cleans the surface of the guide sliding surface 404 after operation, ensuring the working effect of the spoiler 4.

[0108] The stepper motor 1 801 is started regularly to drive the swing rod 2 802 to swing, and the folded cloth 803 is stretched and unfolded to partially block the air outlet of the silencer housing 1. At this time, the reduction of the air outlet will increase the air pressure in the silencer housing 1. At this time, the airflow in the silencer housing 1 will be discharged to the outside of the silencer housing 1 through the rotating airflow outlet 402, the volute centrifugal fan 403, and the air filter 2. The filter on the surface of the air filter 2 is flushed by the reverse airflow generated to ensure the working effect of the air filter 2.

[0109] The foregoing is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained herein are to be implemented in accordance with conventional means in the art unless otherwise specified or limited.

Claims

1. An explosion-proof low-noise fan box, comprising a silencer housing (1), a volute-less centrifugal fan (12), and a smoke concentration detector, characterized in that: A centrifugal fan (12) without a volute is provided at a position corresponding to the air inlet of the silencer housing (1); the internal cavity of the silencer housing (1) is square; an array of turbulence devices (4) are provided inside the silencer housing (1) on a side away from the air filter (2); the turbulence devices (4) are used to drive the airflow in the silencer housing (1) to rotate; A guide cylinder (5) is provided on the outer side of the volute-less centrifugal fan (12), and the guide cylinder (5) is used to constrain the airflow generated by the volute-less centrifugal fan (12) during operation; The spoiler device (4) comprises a guide block (401) and a rotating airflow outlet (402), wherein the guide block (401) is arranged at a corner of the inner wall of the silencer housing (1), and the end faces of the guide blocks (401) are connected to each other, and a guide sliding surface (404) is provided on the guide block (401), wherein the guide sliding surface (404) causes a height difference between the two ends of the guide block (401) corner, and the rotating airflow outlet (402) is provided on the higher corner end face, and a volute centrifugal fan (403) is provided inside the guide block (401), and the air outlet of the volute centrifugal fan (403) is communicated with the rotating airflow outlet (402); A reinforcement plate is provided on one side of the guide block (401), one end of the volute centrifugal fan (403) is rotatably connected to the reinforcement plate, one end of the volute centrifugal fan (403) protruding from the reinforcement plate is fixedly connected to a transmission wheel (406), and each of the transmission wheels (406) is connected in transmission via a transmission belt (407), and a second stepper motor (11) is fixedly connected in the silencer housing (1), and the second stepper motor (11) is connected in transmission to one of the volute centrifugal fans (403) via a coupling (10); An air filter (2) is provided on the silencer housing (1), the air filter (2) is in communication with the air inlet of the volute centrifugal fan (403), and the air filter (2) is used to filter air; The guide cylinder (5) comprises a guide shell (501) and a spiral blade (502); the guide shell (501) is sleeved on the outside of the centrifugal fan (12) without a volute; the inner wall of the guide shell (501) is provided with a spiral blade (502) at a position corresponding to the motor position of the centrifugal fan (12) without a volute; the spiral blade (502) is used to guide the airflow; The middle part of the flow-disturbing device (4) is rotatably connected to a spiral dust-cleaning device (6), and the spiral dust-cleaning device (6) is used to clean dust on the inner wall of the flow-disturbing device (4); The spiral dust cleaning device (6) comprises a sleeve (601) and a rotating shaft (605), wherein the rotating shaft (605) is rotatably connected in the sleeve (601), a plurality of equally spaced reels (602) are fixedly connected to the rotating shaft (605), a scraping strip (603) is fixedly connected to the reel (602), the scraping strip (603) passes through the sleeve (601) and extends outside the sleeve (601), and a mounting block (604) is fixedly connected to one end of the scraping strip (603) away from the sleeve (601); The end of the fitting block (604) is a flexible cloth, and the flexible cloth can be in contact with the outer wall of the guide sliding surface (404).

2. The explosion-proof low-noise fan box according to claim 1, characterized in that: One side of the flow-turbulating device (4) is fixedly connected to a ventilation frame (9), the middle portion of the ventilation frame (9) is rotatably connected to a sleeve (601), and the outer end of the sleeve (601) away from the volute-less centrifugal fan (12) is fixedly connected to a fan (607).

3. The explosion-proof low-noise fan box according to claim 2, characterized in that: One end of the rotating shaft (605) extends out of the end surface of the sleeve (601) and is fixedly connected to a ratchet (606); A synchronization device (7) is provided between the silencer housing (1) and the coupling (10), and the synchronization device (7) includes a shaft sleeve (706) and a rocker arm (701); The outer side of the coupling (10) is fixedly connected to a shaft sleeve (706), two sliding sleeves (707) are slidably connected to the shaft sleeve (706), an elastic sleeve (708) is fixedly connected between the sliding sleeves (707), and a counterweight ball (709) is provided in a cavity formed by the sliding sleeves (707) and the elastic sleeves (708); A swing rod (701) is hinged inside the silencer housing (1), the swing rod (701) corresponds to the ratchet (606) in position, and a latching tooth (703) is provided at the corresponding position, and the end of the swing rod (701) away from the hinge axis contacts the elastic sleeve (708); A waist-shaped groove (702) is provided on the swing rod (701), a control rod (704) is fixedly connected to the silencer housing (1), a slider on the control rod (704) is slidably connected in the waist-shaped groove (702), and a limit spring (705) is provided on the outer side of the control rod (704), and the limit spring (705) supports the waist-shaped groove (702) close to the elastic sleeve (708).

4. The explosion-proof low-noise fan box according to claim 1, characterized in that: The air outlet of the silencer housing (1) is provided with a silencer device (3), and the silencer device (3) is used to silence the output airflow; The silencer device (3) comprises a silencer channel 1 (301) and a silencer channel 2 (302). The silencer channel 1 (301) is connected to the silencer housing (1). The silencer channel 1 (301) and the silencer channel 2 (302) are arranged correspondingly. The silencer channel 1 (301) and the silencer channel 2 (302) are honeycomb-shaped.

5. The explosion-proof low-noise fan box according to claim 4, characterized in that: The outer side of the silencer housing (1) is connected to a pressure relief channel (306), and two groups of bursting discs (307) with different thresholds are arranged inside the pressure relief channel (306), the threshold of the bursting disc (307) close to the spoiler (4) is lower than the threshold of the other bursting disc (307), and a closed cavity is formed between the bursting discs (307); A plurality of support sheets (303) are distributed in an array on the outer side of the support sleeve (308), an annular airbag (304) is sleeved on the outer side of the support sleeve (308), and the support sheet (303) is tightly fitted with the outer wall of the support sleeve (308) under the support of the annular airbag (304), and the silencer channel (301) and the support sleeve (308) are made of elastic material; The annular airbag (304) is connected to the bursting disc (307) through a pipe (305) to form a closed cavity.

6. The explosion-proof low-noise fan box according to claim 1, characterized in that: A flow blocking device (8) is provided in the silencer housing (1), and the flow blocking device (8) is used to clean dust from the air filter (2); The flow blocking device (8) comprises a stepper motor 1 (801) and a second swing rod (802); the second swing rod (802) is hingedly connected to the position of the air outlet inside the silencer housing (1); a folding cloth (803) is fixedly connected to one side of the second swing rod (802); and the other end of the folding cloth (803) is fixedly connected to the inner wall of the silencer housing (1); The stepper motor 1 (801) is used to drive the swing rod 2 (802) to swing.

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