A static pressure box for fire exhaust fans

Abstract

This invention belongs to the field of static pressure box technology, and particularly relates to a static pressure box for fire-fighting smoke exhaust fans. It includes an outer shell, which is composed of a mounting shell, a conical air outlet, a conical outer baffle, a conical inner baffle, and an L-shaped tube. A base plate with a notch in the middle is fixedly installed at the bottom of the mounting shell. Four adjusting slide plates are slidably installed on the upper side of the base plate. Four trigger slide plates are slidably installed on the upper side of the base plate and are circumferentially staggered with the four adjusting slide plates. Adjacent adjusting slide plates and trigger slide plates are connected by a connector. A control mechanism is installed between two adjacent adjusting slide plates. In actual use, when the exhaust airflow is disturbed, the space between the adjusting slide plates and trigger slide plates is increased by adjusting them, reducing the impact of the disturbed airflow on the adjusting slide plates and trigger slide plates, thereby reducing the noise caused by airflow disturbance during use.

Description

Technical Field

[0001] This invention belongs to the field of static pressure box technology, and particularly relates to a static pressure box for fire smoke exhaust fans. Background Technology

[0002] A plenum chamber is an essential component in air supply systems, used to reduce dynamic pressure, increase static pressure, stabilize airflow, and reduce airflow vibration, thus improving air supply performance. A plenum chamber is a device that allows airflow while effectively preventing or reducing the outward propagation of sound energy.

[0003] In practical use, if the transported gas is disturbed, the impact force of the disturbed gas on the wall of the expansion area of ​​the plenum chamber will change in a traditional plenum chamber. Since the volume of the expansion area is fixed, the change in impact force will cause the wall of the expansion area of ​​the plenum chamber to make a sound, generating noise. For places with strict noise requirements, traditional plenum chambers cannot meet the requirement of automatically adjusting the size of the expansion area to reduce noise when airflow disturbance occurs.

[0004] In addition, the noise requirements of a fixed location vary at different times of day. Traditional static pressure chambers, because their expansion area volume is fixed, cannot adjust the noise level according to the different time periods.

[0005] This invention designs a static pressure box for fire-fighting smoke exhaust fans to solve the above problems. Summary of the Invention

[0006] Therefore, it is necessary to address the problems existing in current static pressure boxes by providing a static pressure box for fire exhaust fans. In specific use, when the exhaust airflow is disturbed, the space between the adjusting slide plate and the trigger slide plate can be increased by adjusting the adjusting slide plate and the trigger slide plate, thereby reducing the impact of the disturbed airflow on the adjusting slide plate and the trigger slide plate, and thus reducing the noise caused by the airflow disturbance during use.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A static pressure box for a fire-fighting smoke exhaust fan, comprising:

[0009] The outer casing consists of a mounting shell, a conical air outlet mounted on the upper end of the mounting shell, a conical outer baffle and a conical inner baffle mounted on the lower end of the mounting shell, and an L-shaped tube mounted on the lower side of the conical outer baffle and the conical inner baffle. A bottom plate with a notch in the middle is fixedly mounted on the bottom of the mounting shell.

[0010] Four adjusting slide plates are slidably mounted on the upper side of the base plate, and a first return spring is fixedly installed between the four adjusting slide plates and the inner wall of the mounting shell; four trigger slide plates are slidably mounted on the upper side of the base plate and are staggered with the four adjusting slide plates in the circumferential direction, and a second return spring is fixedly installed between the four trigger slide plates and the inner wall of the mounting shell; adjacent adjusting slide plates and trigger slide plates are connected by a connector.

[0011] An adjustment mechanism is installed between two adjacent adjustment slides.

[0012] The control mechanism includes a winding wheel, a worm spring, a movable pulley, a fixed pulley, and a transmission belt. Two winding wheels are symmetrically and rotatably mounted on both sides of the upper end of the adjusting slide plate, and a worm spring is installed between each winding wheel and its corresponding adjusting slide plate. The upper end of the trigger slide plate has a mounting groove, in which two movable pulleys are rotatably mounted. Four first fixed supports are fixedly mounted inside the mounting housing and located above the four trigger slide plates. Three fixed pulleys are rotatably mounted on the lower side of one end of each fixed support. Two winding wheels mounted at the closest end of two adjacent adjusting slide plates are connected by a transmission belt, which passes over the two movable pulleys mounted on the trigger slide plate between the two adjusting slide plates and the three fixed pulleys mounted on the corresponding first fixed supports. The adjusting slide plate and the mounting housing are connected by a gear and rack transmission.

[0013] In one embodiment, two first guide slide rods are fixedly installed on the back of each of the adjustment slide plates, which are symmetrically distributed vertically. The ends of the two first guide slide rods away from the adjustment slide plate protrude from the corresponding wall surface on the mounting shell and slide in cooperation with the wall surface. The upper end of the conical inner baffle is fixedly connected to the edge of the notch in the middle of the bottom plate.

[0014] Two second guide slide rods are fixedly installed on the back of each trigger slide plate, which are symmetrically distributed vertically. The ends of the two second guide slide rods away from the trigger slide plate protrude through the wall of the mounting shell and slide in cooperation with the mounting shell.

[0015] In one embodiment, the connector consists of an elastic band and two fixing strips fixedly installed at both ends of the elastic band. The elastic band is fixedly installed on the corresponding adjustment slide and trigger slide by the two fixing strips at both ends.

[0016] In one embodiment, the upper end of the vertical tube of the L-shaped tube is fixedly connected to the lower ends of the conical outer baffle and the conical inner baffle, and an annular drainage plate evenly distributed from the inside to the outside is fixedly installed inside the vertical tube of the L-shaped tube.

[0017] In one embodiment, the end of the horizontal tube of the L-shaped tube away from the vertical tube is the air inlet end, and a spiral guide plate is fixedly installed inside the horizontal tube of the L-shaped tube.

[0018] In one embodiment, an anti-disengagement plate is fixedly installed on the fixed pulley to prevent the transmission belt from coming off.

[0019] In one embodiment, the control mechanism further includes a first gear, a fixed rack, a fixed housing, a first rotating shaft, a control worm spring, a second rotating shaft, a third fixed support, a fourth fixed support, a limiting rod, a third gear, a fifth fixed support, a fourth gear, and a gear ring. The winding wheel is rotatably mounted on the adjusting slide plate via the first rotating shaft, and the upper end of the first rotating shaft passes through the corresponding adjusting slide plate where the first gear is fixedly mounted. The fixed housing is fixedly mounted on the corresponding adjusting slide plate via the third and fifth fixed supports. The second rotating shaft is rotatably mounted on the third and fifth fixed supports and passes through the fixed housing. The lower end of the second rotating shaft is fixedly mounted with the third gear, which meshes with the first gear. A control worm spring is installed between the second rotating shaft and the fixed housing. A gear ring is rotatably mounted on the outer surface of the fixed housing, and a limiting rod is slidably mounted on the gear ring via a threaded engagement. The limiting rod engages with the outer layer of the control worm spring, and the position of the connection point between the outer layer of the control worm spring and the fixed housing can be controlled via the limiting rod. A fourth gear is fixedly mounted at the lower end of the fixed housing, and a fixed rack is fixedly mounted inside the housing, meshing with the fourth gear.

[0020] In one embodiment, the second servo motor is fixedly mounted on the gear ring by a fourth fixed support, and the output shaft of the second servo motor is fixedly connected to the limit rod.

[0021] In one embodiment, the first servo motor is fixedly mounted on the fixed housing by a second fixed support, and a second gear is fixedly mounted on the output shaft of the first servo motor, the second gear meshing with a gear ring.

[0022] In one embodiment, the outer layer of the regulating worm spring has teeth, and one end of the limiting rod that penetrates into the fixed shell engages with the teeth of the outer layer of the regulating worm spring.

[0023] Compared with existing technologies, the advantages of this invention are:

[0024] 1. In actual use, when the exhaust airflow is disturbed, the present invention increases the space between the adjusting slide plate and the trigger slide plate by adjusting the adjusting slide plate and the trigger slide plate, thereby reducing the impact of the disturbed airflow on the adjusting slide plate and the trigger slide plate, and thus reducing the noise caused by the disturbance of airflow during use.

[0025] 2. This invention controls the engagement position between the end of the limiting rod inserted into the fixed shell and the teeth of the regulating worm spring by controlling the circumferential rotation and sliding of the limiting rod. This controls the compressibility of the regulating worm spring, i.e., the angle by which the second rotating shaft rotates to drive the fixed shell to rotate via the regulating worm spring. Thus, the sliding distance of the regulating slide and trigger slide under different impact forces can be adjusted according to the noise requirements of the equipment installation site. In other words, the spatial variation between the regulating slide and trigger slide can be adjusted according to different noise requirements of the equipment installation site. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall component appearance.

[0027] Figure 2 This is a schematic diagram of the overall component distribution.

[0028] Figure 3 This is a schematic diagram of the outer shell structure.

[0029] Figure 4 This is a schematic diagram of the drainage plate installation.

[0030] Figure 5 This is a schematic diagram showing the distribution of regulatory agencies.

[0031] Figure 6 This is a schematic diagram of the adjustable sliding plate installation.

[0032] Figure 7 This is a diagram showing the installation of the connectors.

[0033] Figure 8 This is a schematic diagram of the installation of fixed pulleys and movable pulleys.

[0034] Figure 9 This is a schematic diagram of the connector structure.

[0035] Figure 10 This is a schematic diagram of the transmission belt installation.

[0036] Figure 11 This is a schematic diagram of the installation of a fixed pulley.

[0037] Figure 12 This is a schematic diagram of the trigger slide structure.

[0038] Figure 13 This is a schematic diagram of the installation of a fixed rack.

[0039] Figure 14 This is a schematic diagram of the regulatory mechanism.

[0040] Figure 15 This is a schematic diagram of the installation of the first and second servo motors.

[0041] Figure 16 This is a schematic diagram of the connection between the limit rod and the regulating worm spring.

[0042] Figure 17 This is a schematic diagram of the installation of a spiral spring.

[0043] The labels in the diagram are as follows: 1. Outer shell; 2. Trigger slide plate; 3. First guide slide rod; 4. Second guide slide rod; 5. Connector; 6. Adjusting slide plate; 7. Control mechanism; 8. First return spring;

[0044] 1001. Conical air outlet; 1002. Mounting housing; 1003. Base plate; 1005. Conical outer baffle; 1006. Conical inner baffle; 1007. Drain plate; 1008. L-shaped tube; 1009. Spiral drainage plate;

[0045] 2001, Mounting slot;

[0046] 5001, Elastic band; 5002, Fixing strip;

[0047] 7001. Transmission belt; 7002. Winding wheel; 7003. Movable pulley; 7004. Fixed pulley; 7005. First fixed support; 7006. First gear; 7007. Anti-arc plate; 7008. Fixed rack; 7009. Fixed housing; 7010. First rotating shaft; 7011. Second fixed support; 7012. First servo motor; 7013. Second gear; 7014. Adjustable worm spring; 7015. Second rotating shaft; 7016. Third fixed support; 7017. Fourth fixed support; 7018. Second servo motor; 7019. Limiting rod; 7020. Third gear; 7021. Fifth fixed support; 7022. Fourth gear; 7023. Gear ring; 7024. Limiting tooth; 7025. Worm spring; 7026. Second return spring. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0049] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] like Figure 1 -like Figure 16 As shown, a static pressure box for a fire-fighting smoke exhaust fan, such as Figure 1 As shown, it includes a housing 1, as Figure 3 As shown, the outer casing 1 is composed of a mounting shell 1002, a conical air outlet 1001 mounted on the upper end of the mounting shell 1002, a conical outer baffle 1005 and a conical inner baffle 1006 mounted on the lower end of the mounting shell 1002, and an L-shaped tube 1008 mounted on the lower side of the conical outer baffle 1005 and the conical inner baffle 1006. A bottom plate 1003 with a notch in the middle is fixedly mounted on the bottom of the mounting shell 1002; four adjusting slide plates 6 are slidably mounted on the upper side of the bottom plate 1003, such as... Figure 1 , 2 As shown in Figures 5 and 6, a first return spring 8 is fixedly installed between the four adjusting slide plates 6 and the inner wall of the mounting housing 1002; four trigger slide plates 2 are slidably installed on the upper side of the base plate 1003 and are circumferentially staggered with the four adjusting slide plates 6, as shown in Figures 6 and 6. Figure 1 , 5 As shown, a second return spring 7026 is fixedly installed between the four trigger slide plates 2 and the inner wall of the mounting housing 1002; as Figure 6 As shown, the adjacent adjusting slide plate 6 and trigger slide plate 2 are connected by a connector 5.

[0052] The first return spring 8 functions to reset the four adjusting slide plates 6, and the second return spring 7026 functions to reset the four trigger slide plates 2. The pressure of the second return spring 7026 is less than that of the first return spring 8. When the four adjusting slide plates 6 are in their initial state, the lower ends of the four adjusting slide plates 6 are flush with the edge of the notch in the middle of the base plate 1003, and the space between the four adjusting slide plates 6 is at the minimum adjustable state of the device. At this time, the lower ends of the four trigger slide plates 2 are flush with the edge of the notch in the middle of the base plate 1003. When the four trigger slide plates 2 and the four adjusting slide plates 6 are adjusted to slide outward, the corresponding first return spring 8 and second return spring 7026 are compressed. During the adjustment process, when the four trigger slide plates 2 and the four adjusting slide plates 6 slide from the outside to the inside, the first return spring 8 provides a reset force to the four adjusting slide plates 6, and the second return spring 7026 provides a reset force to the four trigger slide plates 2.

[0053] The present invention provides two layers of plates, namely a conical outer baffle 1005 and a conical inner baffle 1006, at the lower end of the mounting shell 1002. The mounting shell 1002, the adjusting slide plate 6, and the trigger slide plate 2 also form two layers, inner and outer. When vibration occurs, the inner layer plate will generally vibrate, while the outer layer plate will vibrate relatively less, which can also reduce noise to a certain extent.

[0054] like Figure 5 As shown, a control mechanism 7 is installed between two adjacent adjusting slide plates 6.

[0055] like Figure 8 , 13 As shown in Figures 14 and 15, the control mechanism 7 includes a winding wheel 7002, a worm spring 7025, a movable pulley 7003, a fixed pulley 7004, and a transmission belt 7001. Two winding wheels 7002 are symmetrically and rotatably mounted on both sides of the upper end of the adjusting slide plate 6. Figure 17 As shown, a spiral spring 7025 is installed between the winding wheel 7002 and the corresponding adjusting slide plate 6; as Figure 12 As shown, the upper end of the trigger slide plate 2 has a mounting groove 2001, and two movable pulleys 7003 are rotatably mounted in the mounting groove 2001; four first fixed supports 7005 are fixedly mounted in the mounting shell 1002 and located on the upper side of the four trigger slide plates 2, as shown. Figure 11 As shown, three fixed pulleys 7004 are rotatably mounted on the underside of one end of each fixed support; as... Figure 8 , 10As shown, the two winding wheels 7002 installed at one end of the two adjacent adjusting slide plates 6 are connected by a transmission belt 7001. The transmission belt 7001 passes around the two movable pulleys 7003 installed on the trigger slide plate 2 between the two adjusting slide plates 6 and the three fixed pulleys 7004 installed on the corresponding first fixed support 7005. The adjusting slide plate 6 is connected to the mounting shell 1002 by gear and rack transmission.

[0056] The function of the spiral spring is to reset the eight winding wheels 7002; when the four trigger slide plates 2 and the four adjusting slide plates 6 slide outward, the corresponding spiral spring is compressed, and the winding wheel 7002 rotates to release the transmission belt 7001; during the adjustment process, when the four trigger slide plates 2 and the four adjusting slide plates 6 slide from the outside to the inside, the winding wheel 7002 rotates in the opposite direction under the action of the corresponding spiral spring, winding and collecting the transmission belt 7001.

[0057] In this invention, the design of the movable pulley 7003 and the fixed pulley 7004 can amplify the transmission ratio between the trigger slide plate 2 and the adjusting slide plate 6. Based on the small sliding stroke of the trigger slide plate 2, the design of the fixed pulley 7004 and the movable pulley 7003 amplifies the length of the transmission belt 7001 pulled out from the winding wheel 7002 and amplifies the rotation angle of the winding wheel 7002, thereby ensuring that the adjusting slide plate 6 has sufficient driving force and ensuring that the adjusting slide plate 6 slides smoothly.

[0058] In a further embodiment, such as Figure 1 , 2 As shown in Figure 5, two first guide slide rods 3 are fixedly installed on the back of each of the adjusting slide plates 6, which are symmetrically distributed vertically. The ends of the two first guide slide rods 3 away from the adjusting slide plate 6 protrude from the corresponding wall surface on the mounting shell 1002 and slide in cooperation with the wall surface. The upper end of the conical inner baffle 1006 is fixedly connected to the edge of the notch in the middle of the base plate 1003. The function of the first guide slide rods 3 is to guide the corresponding adjusting slide plate 6.

[0059] like Figure 1 , 5 As shown, each trigger slide plate 2 has two symmetrically distributed second guide slide rods 4 fixedly installed on its back. The ends of the two second guide slide rods 4 away from the trigger slide plate 2 protrude from the wall of the mounting shell 1002 and slide in cooperation with the mounting shell 1002. The function of the second guide slide rods 4 is to guide the corresponding trigger slide plate 2.

[0060] In a further embodiment, such as Figure 9As shown, the connecting member 5 consists of an elastic band 5001 and two fixing strips 5002 fixedly installed at both ends of the elastic band 5001. The elastic band 5001 is fixedly installed on the corresponding adjusting slide plate 6 and trigger slide plate 2 by the two fixing strips 5002 at both ends. The function of the elastic band 5001 is to ensure that when the four adjusting slide plates 6 slide outward or inward, the elastic band 5001 can block and seal the gap between adjacent adjusting slide plates 6. In addition, the present invention designs two fixing strips 5002 at both ends of the elastic band 5001. The fixing strips 5002 are fixedly installed on the corresponding adjusting slide plate 6 and trigger slide plate 2 at positions away from the middle gap. This design can ensure the width of the elastic band 5001 and ensure that the extension and contraction of the elastic band 5001 can adapt to the outward sliding range of the four adjusting slide plates 6, thus ensuring the adjustment effect.

[0061] In a further embodiment, such as Figure 3 , 4 As shown, the upper end of the vertical tube of the L-shaped tube 1008 is fixedly connected to the lower ends of the conical outer baffle 1005 and the conical inner baffle 1006. Annular guide plates 1007, evenly distributed from the inside to the outside, are fixedly installed inside the vertical tube of the L-shaped tube 1008. The function of the annular guide plates 1007 is to guide the gas flowing through the vertical tube of the L-shaped tube 1008, ensuring that the gas flowing through the vertical tube of the L-shaped tube 1008 can flow smoothly into the conical inner baffle 1006; and to prevent turbulent flow that could generate noise.

[0062] In a further embodiment, such as Figure 3 As shown, the end of the horizontal tube of the L-shaped tube 1008 furthest from the vertical tube is the air inlet. A spiral guide vane 1009 is fixedly installed inside the horizontal tube of the L-shaped tube 1008. The function of the spiral guide vane 1009 is to increase the flow path of the airflow through the horizontal tube of the L-shaped tube 1008, reduce the impact force of the airflow on the tube wall, and thus achieve the effect of reducing noise.

[0063] In a further embodiment, such as Figure 10 , 11 As shown, an anti-disengagement plate 7007 is fixedly installed on the fixed pulley 7004 to prevent the transmission belt 7001 from disengaging.

[0064] In a further embodiment, such as Figure 14 , 15As shown, the control mechanism 7 further includes a first gear 7006, a fixed rack 7008, a fixed housing 7009, a first rotating shaft 7010, a control worm spring 7014, a second rotating shaft 7015, a third fixed support 7016, a fourth fixed support 7017, a limit rod 7019, a third gear 7020, a fifth fixed support 7021, a fourth gear 7022, and a gear ring 7023. The winding wheel 7002 is rotatably mounted on the adjusting slide plate 6 via the first rotating shaft 7010. The upper end of the first rotating shaft 7010 extends through the corresponding adjusting slide plate 6 and is fixedly mounted with the first gear 7006. The fixed housing 7009 is fixedly mounted on the corresponding adjusting slide plate 6 via the third fixed support 7016 and the fifth fixed support 7021. The second rotating shaft 7015 is rotatably mounted on the third fixed support 7016 and the fifth fixed support 7021. The second rotating shaft 7015 passes through the fixed housing 7009, and a third gear 7020 is fixedly installed at the lower end of the second rotating shaft 7015. The third gear 7020 meshes with the first gear 7006. An adjusting worm spring 7014 is installed between the second rotating shaft 7015 and the fixed housing 7009. A gear ring 7023 is rotatably installed on the outer surface of the fixed housing 7009. A limit rod 7019 is slidably installed on the gear ring 7023 through a threaded engagement. The limit rod 7019 engages with the outer layer of the adjusting worm spring 7014, and the position of the connection point between the outer layer of the adjusting worm spring 7014 and the fixed housing 7009 can be controlled by the limit rod 7019. A fourth gear 7022 is fixedly installed at the lower end of the fixed housing 7009, and a fixed rack 7008 is fixedly installed inside the mounting housing 1002. The fixed rack 7008 meshes with the fourth gear 7022.

[0065] When airflow is disturbed during use, the impact force of the airflow entering between the adjusting slide plate 6 and the trigger slide plate 2 on the adjusting slide plate 6 and the trigger slide plate 2 will increase. At this time, because the pressure of the first return spring 8 installed on the adjusting slide plate 6 is greater than the pressure of the second return spring 7026 installed on the trigger slide plate 2, the trigger slide plate 2 will be squeezed and slid first. The sliding of the trigger slide plate 2 will drive the corresponding movable pulley 7003 to slide. The sliding of the movable pulley 7003 will pull the transmission belt 7001. The transmission belt 7001 being pulled will drive the winding wheel 7002 to rotate. When the winding wheel 7002 is pulled and rotated, the winding wheel 7002 will drive the first rotating shaft 7010 to rotate. The rotation of the first rotating shaft 7010 will drive the first gear 7006 to rotate. The rotation of the first gear 7006 will drive the third gear 7020 to rotate. The rotation of the third gear 7020 will drive the second rotating shaft 7015 to rotate. The rotation of the second rotating shaft 7015 will drive the limiting rod 7019 to rotate around the fixed shell 7009 through the control of the worm spring 7014. The rotation of the limiting rod 7019 causes the fixed housing 7009 to rotate, which in turn causes the gear ring 7023 to rotate. Because the gear ring 7023 meshes with the fixed rack 7008 fixedly installed inside the mounting housing 1002, the gear ring 7023 rotates under the action of the fixed rack 7008, causing the fixed housing 7009 to slide relative to the mounting housing 1002. This sliding of the fixed housing 7009, through the third fixed support 7016 and the fifth fixed support 7021, causes the corresponding adjusting slide plate 6 to slide relative to the mounting housing 1002, thus achieving the adjustment of the adjusting slide plate 6. Adjusting the adjusting slide plate 6 and the trigger slide plate 2 increases the space between them. During actual use, when the exhaust airflow is disturbed, adjusting the adjusting slide plate 6 and the trigger slide plate 2 increases the space between them, reducing the impact of the disturbed airflow on the adjusting slide plate 6 and the trigger slide plate 2, thereby reducing noise caused by airflow disturbances during use.

[0066] In a further embodiment, such as Figure 13 , 14 As shown in Figure 15, the second servo motor 7018 is fixedly mounted on the gear ring 7023 by the fourth fixed support 7017, and the output shaft of the second servo motor 7018 is fixedly connected to the limit rod 7019.

[0067] In a further embodiment, such as Figure 13 , 14 As shown in Figure 15, the first servo motor 7012 is fixedly mounted on the fixed housing 7009 by the second fixed support 7011, and the second gear 7013 is fixedly mounted on the output shaft of the first servo motor 7012. The second gear 7013 meshes with the gear ring 7023.

[0068] In a further embodiment, such as Figure 16 As shown, the outer layer of the regulating worm spring 7014 has teeth, and one end of the limiting rod 7019 that penetrates into the fixed shell 7009 engages with the teeth of the outer layer of the regulating worm spring 7014.

[0069] The second servo motor 7018 can control the rotation of the limit rod 7019. Since the limit rod 7019 is threadedly mounted on the gear ring 7023, when the limit rod 7019 rotates, it slides relative to the gear ring 7023 under the action of the thread. When the first servo motor 7012 is activated, it drives the second gear 7013 to rotate. The rotation of the second gear 7013 causes the gear ring 7023 to rotate circumferentially around the fixed housing 7009. The rotation of the gear ring 7023 causes the limit rod 7019 to rotate circumferentially around the fixed housing 7009. Therefore, the first servo motor 7012 and the second servo motor 7018 can control the circumferential rotation and sliding of the limit rod 7019 relative to the fixed housing 7009. By controlling the circumferential rotation and sliding of the limit rod 7019, the limit rod 7019 can be controlled. The engagement position of the end of the 9-pinion inserted into the fixed housing 7009 with the teeth of the outer layer of the regulating worm spring 7014 controls the compressibility of the regulating worm spring 7014, i.e., controls the angle by which the second rotating shaft 7015 rotates to drive the fixed housing 7009 to rotate via the regulating worm spring 7014. In this way, the sliding size of the regulating slide plate 6 and the trigger slide plate 2 under different impact forces can be adjusted according to the noise requirements of the equipment installation site. In other words, the different spatial changes between the regulating slide plate 6 and the trigger slide plate 2 can be adjusted according to the different noise requirements of the equipment installation site.

[0070] The present invention has a conical air outlet 1001 installed at the upper end of the mounting shell 1002. The exhaust gas will eventually be discharged from the conical air outlet 1001. The lower end of the conical air outlet 1001 is a plane with a gap between it and the upper end of the mounting shell 1002. The control mechanism 7 is installed at this gap. In actual use, when the airflow flows upward, some gas will flow into the gap. However, when the airflow in the gap is full, the airflow will no longer enter the gap. The airflow in the gap reaches a stable state and will not affect the normal airflow.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A static pressure box for a fire-fighting smoke exhaust fan, characterized in that: It includes The outer casing consists of a mounting shell, a conical air outlet, a conical outer baffle, a conical inner baffle, and an L-shaped tube. A base plate with a notch in the middle is fixedly installed at the bottom of the mounting shell; the conical air outlet is located at the upper end of the mounting shell; the conical outer baffle and the conical inner baffle are respectively located at the lower end of the base plate; the upper end of the vertical tube of the L-shaped tube is fixedly connected to the lower end of the conical outer baffle and the conical inner baffle. Four adjusting slide plates are slidably mounted on the upper side of the base plate, and a first return spring is fixedly installed between the four adjusting slide plates and the inner wall of the mounting shell; four trigger slide plates are slidably mounted on the upper side of the base plate and are staggered with the four adjusting slide plates in the circumferential direction; a second return spring is fixedly installed between the four trigger slide plates and the inner wall of the mounting shell; adjacent adjusting slide plates and trigger slide plates are connected by a connector. An adjustment mechanism is installed between two adjacent adjusting slides; The control mechanism includes a winding wheel, a movable pulley, a fixed pulley, and a transmission belt. Two winding wheels are symmetrically and rotatably mounted on both sides of the upper end of the adjusting slide plate, and a spiral spring is installed between each winding wheel and its corresponding adjusting slide plate. The upper end of the trigger slide plate has a mounting groove, within which two movable pulleys are rotatably mounted. Four first fixed supports are fixedly mounted inside the mounting housing and located above the four trigger slide plates. Three fixed pulleys are rotatably mounted on the lower side of one end of each fixed support. Two winding wheels mounted at the closest ends of two adjacent adjusting slide plates are connected by a transmission belt, which passes over the two movable pulleys mounted on the trigger slide plate between the two adjusting slide plates and the three fixed pulleys mounted on the corresponding first fixed supports. The adjusting slide plate and the mounting housing are connected by a gear and rack transmission.

2. The static pressure box for a fire-fighting smoke exhaust fan according to claim 1, characterized in that: Two first guide slide rods are fixedly installed on the back of each of the aforementioned adjusting slide plates, which are symmetrically distributed vertically. The ends of the two first guide slide rods away from the adjusting slide plate protrude from the corresponding wall surface on the mounting shell and slide in cooperation with the wall surface. The upper end of the conical inner baffle is fixedly connected to the edge of the notch in the middle of the bottom plate. Two second guide slide rods are fixedly installed on the back of each trigger slide plate, which are symmetrically distributed vertically. The ends of the two second guide slide rods away from the trigger slide plate protrude through the wall of the mounting shell and slide in cooperation with the mounting shell.

3. The static pressure box for a fire-fighting smoke exhaust fan according to claim 1, characterized in that: The connector consists of an elastic band and two fixing strips fixedly installed at both ends of the elastic band. The elastic band is fixedly installed on the corresponding adjustment slide and trigger slide by the two fixing strips at both ends.

4. The static pressure box for a fire-fighting smoke exhaust fan according to claim 1, characterized in that: The L-shaped tube has a fixedly installed annular drainage plates that are evenly distributed from the inside to the outside.

5. The static pressure box for a fire-fighting smoke exhaust fan according to claim 1, characterized in that: The end of the horizontal tube of the L-shaped tube furthest from the vertical tube is the air inlet, and a spiral guide plate is fixedly installed inside the horizontal tube of the L-shaped tube.

6. The static pressure box for a fire-fighting smoke exhaust fan according to claim 1, characterized in that: An anti-disengagement plate is fixedly installed on the fixed pulley to prevent the transmission belt from coming off.

7. A static pressure box for a fire-fighting smoke exhaust fan according to claim 1, characterized in that: The control mechanism further includes a first gear, a fixed rack, a fixed housing, a first rotating shaft, a control worm spring, a second rotating shaft, a third fixed support, a fourth fixed support, a limit rod, a third gear, a fifth fixed support, a fourth gear, and a gear ring. The winding wheel is rotatably mounted on the adjusting slide plate via the first rotating shaft. The upper end of the first rotating shaft passes through the corresponding adjusting slide plate and is fixedly mounted with the first gear. The fixed housing is fixedly mounted on the corresponding adjusting slide plate via the third and fifth fixed supports. The second rotating shaft is rotatably mounted on the third and fifth fixed supports and passes through the fixed housing. The lower end of the second rotating shaft is fixedly mounted with the third gear, which meshes with the first gear. A control worm spring is installed between the second rotating shaft and the fixed housing. A gear ring is rotatably mounted on the outer surface of the fixed housing, and a limit rod is slidably mounted on the gear ring via a threaded engagement. The limit rod engages with the outer layer of the control worm spring, allowing control of the connection point between the outer layer of the control worm spring and the fixed housing. A fourth gear is fixedly mounted at the lower end of the fixed housing, and a fixed rack is fixedly mounted inside the housing, meshing with the fourth gear.

8. A static pressure box for a fire-fighting smoke exhaust fan according to claim 7, characterized in that: The second servo motor is fixedly mounted on the gear ring via the fourth fixed support, and the output shaft of the second servo motor is fixedly connected to the limit rod.

9. A static pressure box for a fire-fighting smoke exhaust fan according to claim 7, characterized in that: The first servo motor is fixedly mounted on the fixed housing by the second fixed support, and a second gear is fixedly mounted on the output shaft of the first servo motor, which meshes with the gear ring.

10. A static pressure box for a fire-fighting smoke exhaust fan according to claim 7, characterized in that: The outer layer of the regulating worm spring has teeth, and one end of the limiting rod that penetrates into the fixed shell engages with the teeth of the outer layer of the regulating worm spring.

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