Raise dust prevention unit and desilting and filtering device

Abstract

The utility model provides a dust raising prevention unit and a desilting filter device, the dust raising prevention unit comprises a falling pipe, and the falling pipe is provided with an inlet end and an outlet end which are communicated with each other in the length direction; the multiple baffles are located in the falling pipe, the baffles are sequentially arranged at intervals in the length direction of the falling pipe, and a sand and dust falling gap is reserved between each baffle and the inner wall of the falling pipe; the sand and dust falling gaps corresponding to the baffles and the adjacent baffles in the length direction of the falling pipe are oppositely arranged. Falling sand and dust enter the falling pipe through the inlet end in the dust raising prevention unit and are discharged through the outlet end, a baffle in the falling pipe shields the sand and dust possibly raising reversely, the dust is prevented from overflowing through the inlet end, dust raising is avoided, a sand and dust falling gap in the baffle is used for normal falling of the sand and dust, and the dust raising efficiency is improved. A traditional movable opening and closing dust raising prevention structure is omitted, and the operation and maintenance cost of on-site constructors is reduced.

Description

Technical Field

[0001] The utility model relates to the field of heating and ventilation, and in particular to a dust prevention unit and a sand settling filtering device. Background Art

[0002] HVAC is an integral part of a building, encompassing heating, ventilation, and air conditioning. Ventilation, in particular, involves using fans and ducts to improve the indoor air quality through ventilation. Currently, ventilation systems also incorporate filters to condition the incoming air, particularly in windy and dusty areas. This prevents outdoor wind from carrying dust and fine sand particles into the ducts, where they enter the fans and related equipment, potentially impacting the efficiency of HVAC equipment and indoor air quality. For example, fans can become stuck, shortening their service life. Larger sand particles can erode and wear the duct surface, causing noise. Dust entering the room through the air intake system can also degrade indoor air quality, causing discomfort and harming the health of those inside.

[0003] In order to prevent dust overflow and avoid secondary dust generation from the dust collection unit during the operation of the air intake system, the existing Chinese invention patent with publication number CN114570117A discloses a sand settling and filtering device and an air intake system, in which a movable flap structure is placed in the channel of the dust collection unit to avoid possible dust generation. However, the movable structure generally requires manual or electric drive operation, which increases the operation and maintenance costs of on-site construction personnel. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a maintenance-free dust prevention unit and a sand filtering device which can avoid the generation of dust.

[0005] According to one purpose of the present invention, the present invention provides a dust prevention unit, comprising:

[0006] A drop pipe having an inlet end and an outlet end connected in a length direction;

[0007] A plurality of baffles are located in the drop tube, and the baffles are arranged in sequence along the length direction of the drop tube. A gap for dust falling is reserved between each baffle and the inner wall of the drop tube, and the dust falling gap corresponding to the baffle is relatively arranged with the adjacent baffle in the length direction of the drop tube.

[0008] Preferably, the projection of the baffle on the radial cross section of the drop tube along the length direction of the drop tube completely covers the radial cross section of the drop tube.

[0009] Preferably, the sum of the cross-sectional dimensions of each baffle in the radial direction of the drop tube is equal to the cross-sectional dimension of the inner wall of the drop tube.

[0010] Preferably, the side of the baffle facing the inlet end is a contact surface, the side of the baffle facing the outlet end is a shielding surface, the side of the contact surface close to the dust falling gap is inclined toward the outlet end, and the side of the shielding surface close to the dust falling gap is inclined toward the outlet end.

[0011] Preferably, an air outlet slope and an air inlet slope are provided above the inlet end, and in the horizontal direction, the inlet end is located between the air outlet slope and the air inlet slope;

[0012] The extension lines on the air outlet slope and the air inlet slope both pass through the contact surface close to the inlet baffle, and the extension lines on the contact surface close to the inlet baffle and the shielding surface both pass through the contact surface of the adjacent baffle.

[0013] Preferably, the intersection of the extension line on the air outlet slope and the contact surface of the baffle, as well as the intersection of the extension line on the air inlet slope and the contact surface of the baffle, are both located above the center of the baffle in the length direction of the drop pipe;

[0014] The intersection points of the extended lines of the contact surface and shielding surface of the baffle close to the inlet end and the contact surface of the adjacent baffle are both located above the center of the baffle where the intersection point is located in the length direction of the drop tube.

[0015] Preferably, the number of the baffles is two, namely an upper baffle and a lower baffle, and the upper baffle and the lower baffle are sequentially arranged between the inlet end and the outlet end;

[0016] In one radial direction of the drop tube, the upper baffle includes an upper first baffle and an upper second baffle connected in sequence, the proximal ends of the upper first baffle and the upper second baffle are located at the center of the drop tube, and a gap for dust falling is reserved between the distal ends of the upper first baffle and the upper second baffle and the inner wall of the drop tube, and the lower baffle includes a lower first baffle and a lower second baffle, the lower first baffle and the lower second baffle are respectively connected to both sides of the inner wall of the drop tube, and a gap for dust falling is reserved between a side of the lower first baffle facing away from the inner wall of the drop tube and a side of the lower second baffle facing away from the inner wall of the drop tube;

[0017] The upper first baffle is arranged relative to the air inlet slope and the lower first baffle, and the upper second baffle is arranged relative to the air outlet slope and the lower second baffle.

[0018] Preferably, the cross-sectional dimension of the dust falling gap in the radial direction of the drop pipe is much smaller than the cross-sectional dimension of the inner wall of the drop pipe in the radial direction.

[0019] Preferably, the dust prevention unit is arranged in the drop pipe close to the inlet end.

[0020] This solution also provides a sand filtering device, comprising the above-mentioned dust prevention unit, and further comprising:

[0021] A gravity sand settling unit, a dust collecting unit and a dust blocking component, wherein the dust blocking component is arranged inside the gravity sand settling unit, the gravity sand settling unit is connected to the inlet end of the drop pipe, and the dust collecting unit is connected to the outlet end of the drop pipe.

[0022] Compared with the existing technology, this technical solution has the following advantages:

[0023] The falling dust enters the down pipe through the inlet end and is discharged through the outlet end in the dust prevention unit, wherein the baffle in the down pipe blocks the dust that may be raised in the reverse direction, preventing the dust from overflowing through the inlet end and avoiding dust. The dust falling gap on the baffle allows the dust to fall normally, which eliminates the traditional movable opening and closing dust prevention structure and reduces the operation and maintenance costs of on-site construction personnel.

[0024] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of the gravity sedimentation unit of the utility model;

[0026] Figure 2 This is a schematic structural diagram of the dust prevention unit of the present invention;

[0027] Figure 3 This is a structural diagram of the sand filtering device of the air intake system of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the dust collection unit of the present invention. DETAILED DESCRIPTION

[0029] The following description is intended to disclose the present invention and enable those skilled in the art to implement the present invention. The preferred embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0030] like Figure 3As shown, the sand settling filtering device 100 includes a gravity sand settling unit 110 and a dust collecting unit 130. The gravity sand settling unit 110 includes a sand settling shell 111, an air inlet pipe 112, an air outlet pipe 113 and a dust blocking component 114. The bottom of the sand settling shell is connected to the dust collecting unit 130. The air inlet pipe 112 and the air outlet pipe 113 are respectively connected to the two sides of the sand settling shell 111, and the horizontal height of the air inlet pipe 112 is lower than the horizontal height of the air outlet pipe 113. The dust blocking component 114 is arranged inside the sand settling shell 111 to block the dust from the wind introduced into the sand settling shell 111.

[0031] The outdoor wind is introduced into the interior of the sand settling shell 111 through the air inlet pipe 112, and is dust-blocked by the dust-blocking assembly 114 provided in the sand settling shell 111, so that the dust-blocked wind is introduced into the room through the air outlet pipe 113, achieving the purpose of air intake, and the dust trapped by the dust-blocking assembly 114 falls directly into the dust collecting unit 130. Compared with the traditional filter structure, it effectively avoids the defects of difficulty in disassembly and assembly and high maintenance cost caused by replacing the filter. The height difference between the air inlet pipe 112 and the air outlet pipe 113 allows some sand and gravel to fall directly into the dust collecting unit 130, and is further blocked by the dust-blocking assembly 114, effectively improving the filtering effect. It avoids the noise and wear caused by the wear of the air duct by particles in the wind, effectively prolongs the service life of the equipment, fan and air duct, and has the advantages of optimizing indoor air quality, reducing the difficulty of operation and maintenance, easy installation, maintenance-free, simple operation, and wide application.

[0032] like Figure 1 and Figure 3 As shown, the air inlet pipe 112 has an upper air inlet edge 1121 and an air inlet lower edge 1122 connected to the sand settling shell 111, the dust blocking component 114 is connected to the upper air inlet edge 1121, and an air inlet slope 1111 is formed between the lower air inlet edge 1122 and the sand settling shell 111, and the air inlet slope 1111 is opposite to the dust blocking component 114.

[0033] Air drawn in from the air inlet duct 112 is blocked by the dust blocking assembly 114, allowing the blocked dust to flow directly through the air inlet slope 1111 into the dust collection unit 130, further improving collection efficiency. The air inlet slope 1111 replaces the corner where the lower edge 1122 of the air inlet meets the sand settling housing 111, preventing dust from collecting at the corner and causing low filtration efficiency.

[0034] Specifically, the dust blocking assembly 114 includes an air inlet dust blocking plate 1141 and an air inlet power part 1142. The air inlet dust blocking plate 1141 is rotatably connected to the air inlet upper edge 1121. The air inlet power part 1142 is transmission-connected to the air inlet dust blocking plate 1141 to drive the air inlet dust blocking plate 1141 to rotate.

[0035] The air inlet dust blocking plate 1141 is rotatably connected to the air inlet upper edge 1121, so that it can be operated according to usage requirements. For example, when the outdoor environment is severely dusty, the air inlet power component 1142 drives the bottom of the air inlet dust blocking plate 1141 to block dust; when there is no dust in the outdoor environment, the air inlet power component 1142 drives the air inlet dust blocking plate 1141 to be folded to reduce the air inlet resistance and reduce the energy consumption of the system.

[0036] refer to Figure 1 and 3 The air inlet power part 1142 can be an electric limiter, and the air inlet dust blocking plate 1141 can be rotated by pulling the pull rope 1143, wherein the pull rope 1143 can be a galvanized steel core rope to prevent the pull rope from breaking, thereby extending the service life.

[0037] Continue to refer Figure 1 and 3 The air inlet dust blocker 1141 comprises two plates 11411, which are arranged at an angle, and the top of the angle is pivotally connected to the air inlet upper edge 1121. The ends of the plates 11411 are connected to the air inlet power member 1142 via a pull rope 1143. The air inlet dust blocker 1141 can be counterweighted to prevent it from being blown away by high wind speeds, thereby preventing it from failing.

[0038] like Figure 1 and 3 As shown, the air outlet pipe 113 has an upper air outlet edge 1131 and an air outlet lower edge 1132 connected to the sand settling shell 111, the dust blocking component 114 is connected to the air outlet lower edge 1132, and the sand settling shell 111 has an air outlet slope 1112 located below the air outlet lower edge 1132 and opposite to the dust blocking component 114.

[0039] Since the air outlet pipe 113 is located above the air inlet pipe 112, and the dust blocking component 114 is installed on the lower edge 1132 of the air outlet of the air outlet pipe 113, the wind in the sand settling shell 111 is blocked by the dust blocking component 114 and then introduced into the room through the air outlet pipe 113. The dust blocked by the dust blocking component 114 uses the air outlet slope 1112 to effectively slide into the dust collecting unit 130, further improving the collection efficiency.

[0040] It should be noted that the outlet pipe 113 is located above the air inlet pipe 112, and the dust blocking component 114 is located at the lower edge 1132 of the air outlet of the outlet pipe 113. In this way, the wind introduced from the air inlet pipe 112 enters the outlet pipe 113 from bottom to top. At this time, some sand and gravel fall directly into the dust collecting unit 130, and the dust blocking component 114 located at the lower edge 1132 of the air outlet can effectively block the dust, and make the blocked dust slide into the dust collecting unit 130 using the wind slope 1112.

[0041] refer to Figure 1 and 3 Because the outlet slope 1112 and the inlet slope 1111 are located on the same horizontal plane, the sand settling housing 111 is funnel-shaped. The outlet slope 1112 may be shorter than the inlet slope 1111 to make them asymmetrical, and the inclination between the outlet slope 1112 and the inlet slope 1111 may be greater than 55 degrees.

[0042] Specifically, the dust blocking assembly 114 includes an air outlet dust blocking plate 1143 and an air outlet power part 1144. The air outlet dust blocking plate 1143 is rotatably connected to the air outlet lower edge 1132. The air outlet power part 1144 is transmission-connected to the air outlet dust blocking plate 1143 to drive the air outlet dust blocking plate 1143 to rotate.

[0043] The shape of the outlet air blocking plate 1143 can be consistent with the shape of the inlet air blocking plate 1141. The outlet air power member 1144 and the inlet air power member 1142 can both be electric limiters. A detailed description is omitted here. For details, please refer to the above content. The inlet air blocking plate 1141 can be larger than the outlet air blocking plate 1143 so that the inlet air blocking plate 1141 can adapt to the longer inlet air slope 1111 to achieve a greater dust blocking effect.

[0044] like Figure 3 and 4 As shown, the dust collecting unit 130 includes a dust collecting shell 131 and a dust collecting sensor 132. The dust collecting shell 131 is connected to the bottom of the sand settling shell 111. The dust collecting sensor 132 is arranged on the dust collecting shell 131 for sensing the dust collection condition in the dust collecting shell 131.

[0045] The dust collection housing 131 may be a cylindrical barrel structure to avoid the problem of difficulty in cleaning caused by dust collection in the corners of the barrel. The sand settling housing 111 may be plugged into the dust collection housing 131, and a rubber gasket 135 may be provided between the two to enhance the sealing of the connection between the two and prevent dust leakage. The rubber gasket 135 may adopt a spiral pattern to enhance the anti-slip sealing effect to ensure that the entire device is airtight. The dust collection sensor 132 may be an infrared sensor, which is provided inside the dust collection housing 131 and is used to sense the dust collection situation inside the dust collection housing 131.

[0046] refer to Figure 4 The dust collecting unit 130 further includes a transparent observation window 133 and / or a signal prompt light 134. The transparent observation window 133 and the signal prompt light 134 are arranged on the dust collecting shell 131. The signal prompt light 134 is linked to the dust collecting sensor 132.

[0047] The transparent observation window 133 can be made of glass so that the user can directly observe the internal situation of the dust collection shell 131 through the transparent observation window 133, and the transparent observation window 133 can be set with a scale to indicate the corresponding dust collection volume, which is convenient for operation and maintenance personnel to clean later. The signal prompt light 134 is linked to the dust collection sensor 132. When the dust collection sensor 132 senses that the sand and dust in the dust collection shell 131 exceeds the set value, such as 50% or 70% of the capacity of the dust collection shell 131, the signal prompt light 134 outside the dust collection shell 131 is set to light up, and a signal is simultaneously sent to the staff to prompt cleaning, which is convenient for operation and maintenance management.

[0048] like Figure 1 and Figure 2 As shown, the sand filtering device 100 further includes a dust prevention unit 120 , which is disposed between the gravity sand setting unit 110 and the dust collecting unit 130 .

[0049] Specifically, the gravity sand settling unit 110 further includes a drop pipe 121, and the drop pipe 121 connects the gravity sand settling unit 110 and the dust collecting unit 130;

[0050] The anti-dust unit 120 includes a plurality of baffles 122 arranged in sequence along the length direction of the drop pipe 121. A dust falling gap 123 is reserved between each baffle 122 and the inner wall of the drop pipe 121. The dust falling gap 123 corresponding to the baffle 122 is relatively arranged with the baffle 122 adjacent to the length direction of the drop pipe 121.

[0051] The dust falling in the gravity sedimentation unit 110 enters the dust collecting unit 130 through the down pipe 121 to collect the dust. By arranging a baffle 122 in the down pipe 121 and making the dust falling gap 123 on the baffle 122 opposite to the adjacent baffle 122, the baffle 122 can block the dust that may be raised in the dust collecting unit 130, thereby avoiding secondary dust in the dust collecting unit 130.

[0052] The projection of the baffle 122 on the radial cross-section of the drop tube 121 along the length direction of the drop tube 121 completely covers the radial cross-section of the drop tube 121. Through the above definition, the baffle 122 in the anti-dust unit 120 can completely block the internal channel of the drop tube 121 in the radial direction of the drop tube 121, thereby improving the anti-dust effect of the anti-dust unit 120. Furthermore, the sum of the cross-sectional dimensions of each baffle 122 in the radial direction of the drop tube 121 is equal to the cross-sectional dimension of the inner wall of the drop tube 121. The size of the baffle 122 is consistent with the cross-sectional dimension of the drop tube 121 in which it is located, thereby preventing dust from overflowing and avoiding secondary dusting of the dust collecting unit 130 during the operation of the air intake system.

[0053] The drop pipe 121 has an inlet end 1211 and an outlet end 1212 that are connected in the length direction. The inlet end 1211 is connected to the dust housing 111, and the outlet end 1212 is connected to the dust collecting housing 131. The dust falling gap communicates with the inlet end 1211 and the outlet end 1212 of the drop pipe 121. In the vertical direction, the inlet end 1211 is located below the air outlet slope 1112 and the air inlet slope 1111. In the horizontal direction, the inlet end 1211 is located between the air outlet slope 1112 and the air inlet slope 1111.

[0054] The side of the baffle 122 facing the inlet end 1211 is a contact surface 122a, and the side of the baffle 122 facing the outlet end 1212 is a shielding surface 122b. To ensure that dust falling on the baffle 122 can fully fall into the dust collection unit, the side of the baffle 122 that contacts the falling dust is inclined. Specifically, the side of the contact surface 122a near the dust falling gap 123 is inclined toward the outlet end 1212. Dust entering through the inlet end 1211 of the drop pipe 121 falls onto the contact surface 122a of the baffle 122. Due to the inclination of the contact surface 122a, the dust on the contact surface 122a slides toward the dust falling gap 123 and falls into the dust collection unit through the dust falling gap 123. To ensure that the baffle 122 can block dust flying out of the dust collection unit 130, the side of the shielding surface 122b near the dust falling gap 123 is inclined toward the outlet end 1212. In one embodiment of the present invention, the shielding surface 122b and the contact surface 122a are parallel. The angle between the contact surface 122a and the vertical direction, as well as the angle between the shielding surface 122b and the vertical direction, are both no less than 45°.

[0055] The extension line on the air outlet slope 1112 and the extension line on the air inlet slope 1111 both pass through the contact surface 122a of the baffle 122 near the inlet end 1211; the extension line of the contact surface 122a of the baffle 122 near the inlet end 1211 and the extension line of the shielding surface 122b both pass through the contact surface 122a of the adjacent baffle 122. The dust and sand sliding down the outlet slope 1112 and the inlet slope 1111 can slide in the direction of their extension line, and the contact surface 122a of the baffle 122 near the inlet end 1211 receives the falling dust and sand, ensuring that the dust and sand can move along the set motion trajectory, and the dust and sand sequentially contact the contact surfaces 122a of several baffles 122 in the length direction of the drop tube 121, and the contact surfaces 122a can reduce the falling speed of the dust and play a certain role in preventing dust from being raised. Similarly, the raised dust enters the drop tube 121 through the outlet end 1212, and after the raised dust and sand contact the shielding surface 122b of the baffle 122 near the inlet end 1211, the raised dust and sand bounces up and moves in a direction close to the extension line of the shielding surface 122b, and the raised dust and sand further contact the contact surface 122a of the adjacent baffle 122, thereby achieving the deceleration and falling back of the raised dust and sand.

[0056] Furthermore, the intersection of the extension line of the air outlet slope 1112 and the contact surface 122a of the baffle 122, as well as the intersection of the extension line of the air inlet slope 1111 and the contact surface 122a of the baffle 122, are both located above the center of the baffle 122 in the length direction of the drop pipe 121 where the intersection is located.

[0057] The intersection of the extended lines of the contact surface 122a and the shielding surface 122b of the baffle 122 near the inlet end 1211 and the contact surface 122a of the adjacent baffle 122 is located above the center of the baffle 122 in the longitudinal direction of the drop tube 121. This allows the dust to slide over a larger distance on the inclined surface, further reducing the kinetic energy of the dust and preventing dust from being raised.

[0058] The cross-sectional dimension of the dust falling gap in the radial direction of the drop tube 121 is much smaller than the cross-sectional dimension of the inner wall of the drop tube 121 in the radial direction. Preferably, the cross-sectional dimension of the dust falling gap in the radial direction of the drop tube 121 is no greater than one-third of the cross-sectional dimension of the inner wall of the drop tube 121 in the radial direction. By limiting the radial dimension of the dust falling gap 123 in the drop tube 121, the dust prevention unit 120 can shield the dust in the dust collection unit 130, further preventing the dust that falls into the dust collection unit 130 from escaping from the dust collection unit 130 under the influence of the airflow of the gravity sedimentation unit 110 above, generating dust.

[0059] The dust prevention unit 120 is disposed within the drop pipe 121 in proximity to the inlet end 1211. Preferably, the distance between the dust prevention unit 120 and the inlet end 1211 is no greater than one-third of the distance between the dust prevention unit 120 and the outlet end 1212. By limiting the installation position of the dust prevention unit 120 within the drop pipe 121, the dust prevention unit 120 is relatively far from the outlet end 1212 where the dust collection unit 130 is installed. During use, dust generated within the dust collection unit 130 consumes a significant amount of kinetic energy when moving through the drop pipe 121 to the dust prevention unit 120, facilitating dust blocking by the dust prevention unit 120.

[0060] Specifically, there are two baffles 122, namely an upper baffle 1221 and a lower baffle 1222. The upper baffle 1221 and the lower baffle 1222 are arranged respectively between the inlet end 1211 and the outlet end 1212. In one radial direction of the drop tube 121, the upper baffle 1221 is located at the center of the inner wall of the drop tube 121, and the lower baffle 1222 is located on both sides of the inner wall of the drop tube 121.

[0061] More specifically, in one radial direction of the drop tube 121, the upper baffle 1221 includes an upper first baffle 12211 and an upper second baffle 12212 sequentially connected along the radial direction of the drop tube 121, the proximal ends of the upper first baffle 12211 and the upper second baffle 12212 are located at the center of the drop tube 121, and the dust barrier is reserved between the distal ends of the upper first baffle 12211 and the upper second baffle 12212 and the inner wall of the drop tube 121. The lower baffle 1222 includes a first lower baffle 12221 and a second lower baffle 12222. The first lower baffle 12221 and the second lower baffle 12222 are respectively connected to two sides of the inner wall of the drop tube 121. The dust falling gap 123 is reserved between the side of the first lower baffle 12221 facing away from the inner wall of the drop tube 121 and the side of the second lower baffle 12222 facing away from the inner wall of the drop tube 121.

[0062] The upper first baffle 12211 is arranged relative to the air inlet slope 1111 and the lower first baffle 12221 , and the upper second baffle 12212 is arranged relative to the air outlet slope 1112 and the lower second baffle 12222 .

[0063] In summary, the outdoor wind is introduced into the interior of the sand settling shell 111 through the air inlet pipe 112, and the dust is blocked by the dust blocking component 114 set in the sand settling shell 111, so that the dust-blocked wind is introduced into the room through the air outlet pipe 113, achieving the purpose of air intake, and the dust blocked by the dust blocking component 114 falls directly into the dust collection unit 130. Compared with the traditional filter structure, it effectively avoids the defects of difficult disassembly and assembly caused by replacing the filter, high maintenance cost, etc. The height difference between the air inlet pipe 112 and the air outlet pipe 113 can cause some sand and gravel to fall directly into the dust collection unit 130, and further block it in combination with the dust blocking component 114, effectively improving the filtering effect.

[0064] Among them, an anti-dust unit 120 is set between the gravity sedimentation unit 110 and the dust collecting unit 130, and sand and dust fall onto the baffle 122 of the anti-dust unit 120. The baffle 122 does not completely close the passage between the gravity sedimentation unit 110 and the dust collecting unit 130, which not only ensures that the sand and dust fall into the dust collecting unit 130, but also prevents the sand and dust in the dust collecting unit 130 from escaping and generating dust under the influence of the wind flow in the gravity sedimentation unit 110.

[0065] The above design avoids the noise and wear caused by particles in the wind abrading the air duct, effectively extending the service life of the equipment, fan and air duct. At the same time, it has the advantages of optimizing indoor air quality, reducing the difficulty of operation and maintenance, easy installation, maintenance-free, simple operation and wide application.

[0066] like Figure 3 As shown, the utility model also provides an air intake system, including the sand filtering device 100 of the above embodiment, and the air intake system also includes a fan 200 and an air valve 300, and the fan 200 and the air valve 300 are arranged on the pipe connecting the air outlet pipe 113 to the room.

[0067] The air inlet pipe 112 of the sand filtering device 100 is connected to the outdoors, and the air outlet pipe 113 is connected to the indoors. When the fan 200 is working and the air valve 300 is opened, the outdoor wind enters the sand setting shell 111 through the air inlet pipe 112, and is dust-blocked by the dust-blocking component 114 arranged in the sand setting shell 111, so that the dust-blocked wind is introduced into the room through the air outlet pipe 113, thereby achieving the purpose of air intake, and the dust blocked by the dust-blocking component 114 directly falls into the dust collecting unit 130.

[0068] Since the air intake system adopts the sand filtering device 100 of the above embodiment, the beneficial effects of the air intake system brought about by the sand filtering device 100 can be referred to the above embodiment.

[0069] refer to Figure 3 The air intake system also includes a plug-in filter assembly 400, which is installed on the air outlet duct 113. It can be installed on the air outlet duct 113 by plugging it into the duct using an external handle, making it easy to assemble and disassemble, and easy for staff to replace regularly. Its average filtration efficiency for 0.4μm particles is 80% to 90%, providing excellent filtration effects, further enhancing filtration capacity. The air introduced into the room is first filtered by the sand filter 100, thereby correspondingly extending the service life of the plug-in filter assembly 400.

[0070] In summary, there is a height difference between the air inlet pipe 112 and the air outlet pipe 113, which allows some sand and gravel to fall directly into the dust collection unit 130, and is further blocked by the dust blocking component 114, effectively improving the filtering effect. It avoids the noise and wear caused by the particles in the wind wearing the air duct, effectively prolongs the service life of the equipment, fan and air duct, and has the advantages of optimizing indoor air quality, reducing the difficulty of operation and maintenance, easy installation, maintenance-free, simple operation, and wide application. By providing a rotatable flap 121 at the bottom of the gravity sedimentation unit 110, dust overflow is prevented, and secondary dusting of the dust collection unit 130 during the operation of the air intake system is avoided. The dust collection unit 130 is equipped with a transparent observation window 133, a signal prompt light 134 and a dust collection sensor 132, which can actually observe the dust collection situation inside the dust collection unit 130. The signal raising light 134 can also be used to work in conjunction with the dust collection sensor 132 to remind the staff to clean it in time, thereby facilitating operation and maintenance management.

[0071] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention cannot be limited by these embodiments alone. That is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A dust prevention unit (120), characterized in that: include: A drop pipe (121), wherein the drop pipe (121) has an inlet end (1211) and an outlet end (1212) that are connected in the length direction; A plurality of baffles (122), wherein the baffles (122) are located in the drop tube (121), and the baffles (122) are arranged in sequence at intervals along the length direction of the drop tube (121), and a dust falling gap (123) is reserved between each of the baffles (122) and the inner wall of the drop tube (121), and the dust falling gap (123) corresponding to any one of the baffles (122) is arranged relative to the adjacent baffle (122).

2. The dust prevention unit (120) according to claim 1, characterized in that: The projection of the baffle (122) on the radial cross section of the drop tube (121) along the length direction of the drop tube (121) completely covers the radial cross section of the drop tube (121).

3. The dust prevention unit (120) according to claim 2, characterized in that: The sum of the cross-sectional dimensions of each baffle (122) in the radial direction of the drop tube (121) is equal to the cross-sectional dimension of the inner wall of the drop tube (121).

4. The dust prevention unit (120) according to claim 1, characterized in that: The side surface of the baffle plate (122) facing the inlet end (1211) is a contact surface (122a), and the side surface of the baffle plate (122) facing the outlet end (1212) is a shielding surface (122b); the side of the contact surface (122a) close to the dust falling gap (123) is inclined toward the outlet end (1212), and the side of the shielding surface (122b) close to the dust falling gap (123) is inclined toward the outlet end (1212).

5. The dust prevention unit (120) according to claim 4, characterized in that: An air outlet slope (1112) and an air inlet slope (1111) are provided above the inlet end (1211); in the horizontal direction, the inlet end (1211) is located between the air outlet slope (1112) and the air inlet slope (1111); The extension line on the air outlet slope (1112) and the extension line on the air inlet slope (1111) both pass through the contact surface (122a) of the baffle (122) close to the inlet end (1211); the extension line of the contact surface (122a) of the baffle (122) close to the inlet end (1211) and the extension line of the shielding surface (122b) both pass through the contact surface (122a) of the adjacent baffle (122).

6. The dust prevention unit (120) according to claim 5, characterized in that: The intersection of an extension line on the air outlet slope (1112) and the contact surface (122a) of the baffle plate (122), as well as the intersection of an extension line on the air inlet slope (1111) and the contact surface (122a) of the baffle plate (122), are both located above the center of the baffle plate (122) at the intersection point in the length direction of the down pipe (121); The intersection points of the extended lines of the contact surface (122a) and the shielding surface (122b) of the baffle (122) close to the inlet end (1211) and the contact surface (122a) of the adjacent baffle (122) are both located above the center of the baffle (122) at the intersection point in the length direction of the drop tube (121).

7. The dust prevention unit (120) according to claim 5, characterized in that: There are two baffles (122), namely an upper baffle (1221) and a lower baffle (1222); the upper baffle (1221) and the lower baffle (1222) are sequentially arranged between the inlet end (1211) and the outlet end (1212); In one radial direction of the drop tube (121), the upper baffle (1221) comprises an upper first baffle (12211) and an upper second baffle (12212) which are connected in sequence, the proximal ends of the upper first baffle (12211) and the upper second baffle (12212) are located at the center of the drop tube (121), and the sand and dust falling gap (123) is reserved between the distal ends of the upper first baffle (12211) and the upper second baffle (12212) and the inner wall of the drop tube (121). The lower baffle plate (1222) comprises a lower first baffle plate (12221) and a lower second baffle plate (12222); the lower first baffle plate (12221) and the lower second baffle plate (12222) are respectively connected to two sides of the inner wall of the lower drop tube (121); and the dust falling gap (123) is reserved between a side of the lower first baffle plate (12221) facing away from the inner wall of the lower drop tube (121) and a side of the lower second baffle plate (12222) facing away from the inner wall of the lower drop tube (121); The upper first baffle (12211) is arranged relative to the air inlet slope (1111) and the lower first baffle (12221), and the upper second baffle (12212) is arranged relative to the air outlet slope (1112) and the lower second baffle (12222).

8. The dust prevention unit (120) according to claim 1, characterized in that: The cross-sectional dimension of the dust falling gap in the radial direction of the drop pipe (121) is much smaller than the cross-sectional dimension of the inner wall of the drop pipe (121) in the radial direction.

9. The dust prevention unit (120) according to claim 1, characterized in that: The dust prevention unit (120) is arranged in the drop pipe (121) in a manner close to the inlet end (1211).

10. A sedimentation and filtering device (100), characterized in that: The dust prevention unit (120) comprises any one of claims 1 to 9 above, and further comprises: A gravity sand settling unit (110), a dust collection unit (130) and a dust blocking component (114), wherein the dust blocking component (114) is arranged inside the gravity sand settling unit (110), the gravity sand settling unit (110) is connected to an inlet end (1211) of the down pipe (121), and the dust collection unit (130) is connected to an outlet end (1212) of the down pipe (121).

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