Air filter assembly with backflushing negative pressure dust removal

Abstract

This utility model discloses a reverse-flushing negative pressure dust removal air filter assembly, including a housing, a reverse-flushing mechanism, and a dust collection mechanism. The housing contains a filter element. The reverse-flushing mechanism includes a pulse valve and a reverse-flushing pipe. The upper end of the reverse-flushing pipe is connected to the outlet of the pulse valve via a pulse connection port, and the lower end of the reverse-flushing pipe extends into the inner side of the filter element. Several reverse-flushing air outlets are sequentially opened from top to bottom at the lower end of the reverse-flushing pipe. The dust collection mechanism includes a lower support and a fan. The lower support is located below the housing and includes a lower locking seat and a negative pressure chamber. The lower locking seat is fixed to the top of the negative pressure chamber, and a dust removal hole communicating with the inner side of the negative pressure chamber is opened at the top of the negative pressure chamber. The fan is fixed to the bottom of the negative pressure chamber. This utility model uses a pulse valve to control high-pressure gas to blow towards the inner wall of the filter element through the reverse-flushing air outlet of the reverse-flushing pipe, blowing dust back into the air inlet chamber, and then into the negative pressure chamber through the dust removal hole, where it is discharged by the fan, achieving efficient dust removal.

Description

Technical Field

[0001] This utility model relates to the field of air filter technology, and in particular to an air filter assembly for backflushing negative pressure dust removal. Background Technology

[0002] Air filters are an essential component of construction machinery such as air compressors, drilling rigs, and excavators. Their filtration efficiency and filtration pressure differential play a vital role in the air compressor head, engine, and other downstream air-consuming equipment, effectively extending their service life and improving work efficiency.

[0003] As the usage time of conventional air filters increases, dust and impurities accumulate on the filter media, leading to a continuous decline in filtration efficiency. Maintaining stable filtration performance within the specified maintenance period is a technical challenge. Furthermore, the air inlet of most existing air filters is circular, occupying a significant amount of space on the filter housing and making filter installation inconvenient. Utility Model Content

[0004] The purpose of this invention is to provide an air filter assembly for reverse-flushing negative pressure dust removal, in order to solve the technical problems of the continuous decline in efficiency and large space occupation of existing air filters after use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The air filter assembly for reverse-flushing negative pressure dust removal includes a housing, which is square in shape. An air outlet pipe is fixedly connected to the top of the housing via an upper fastening seat. Air inlets are provided on all four sides of the housing. A filter element is installed inside the housing. The air outlet of the filter element is connected to the air outlet pipe. The space enclosed by the inner wall of the filter element forms an air outlet cavity. The space enclosed between the outer wall of the filter element and the inner wall of the housing forms an air inlet cavity.

[0007] This utility model also includes a backflush mechanism, which includes a pulse valve and a backflush pipe. The upper end of the backflush pipe is connected to the air outlet of the pulse valve through a pulse connection port, and the lower end of the backflush pipe extends into the inner side of the filter element. Several backflush air outlet holes are opened sequentially from top to bottom at the lower end of the backflush pipe.

[0008] This utility model also includes a dust collection mechanism, which includes a lower support and a fan. The lower support is located below the housing and includes a lower locking seat and a negative pressure chamber. The lower locking seat is fixed to the top of the negative pressure chamber, and the lower end of the filter element is fastened to the lower locking seat. The top of the negative pressure chamber has a dust removal hole that communicates with the inner side of the negative pressure chamber. The fan is fixed to the bottom of the negative pressure chamber, and the air outlet of the fan is set in a direction away from the housing.

[0009] As a preferred embodiment of this utility model, the backflush outlet on the backflush pipe forms a 45° angle with the horizontal direction.

[0010] As a preferred embodiment of this utility model, the backflush pipe has backflush vent holes with the diameter gradually increasing from top to bottom.

[0011] As a preferred embodiment of this utility model, the number of backflush vents on the backflush pipe that are on the same horizontal plane is not less than four, and the backflush vents on the same horizontal plane are distributed in a ring-shaped equidistant array.

[0012] As a preferred embodiment of this utility model, a front filter is provided on all four sides of the shell. The front filter is located inside the shell and includes a support plate with several through holes. A filter plate is fixedly connected to the side of the support plate away from the filter element.

[0013] As a further embodiment of this utility model, the top and bottom of the support plate are both formed with flanges. The upper flange is fixedly connected to the inner top of the shell, and the lower flange is fixedly connected to the top of the negative pressure cavity.

[0014] As a preferred embodiment of this utility model, the bottom of the backflush pipe is sealed with a sealing plate.

[0015] As a preferred embodiment of this utility model, a mounting bracket is fixedly installed on the housing.

[0016] As a preferred embodiment of this utility model, the dust removal hole is located between the outer wall of the filter element and the inner wall of the housing.

[0017] Compared with existing technologies, the air filter assembly for reverse-flushing negative pressure dust removal provided by this utility model has the following beneficial effects:

[0018] This invention uses a pulse valve to control high-pressure gas to blow it through the backflush outlet of the backflush pipe toward the inner wall of the filter element, blowing dust back into the air inlet chamber, and then into the negative pressure chamber through the dust removal hole, and is discharged by the fan, thus achieving efficient dust removal.

[0019] The pre-filter performs preliminary filtration of the air entering the housing, intercepting large dust particles and impurities, reducing the amount of dust entering the air intake cavity, reducing the burden on the filter element, extending its service life, and at the same time ensuring even air distribution and reducing localized damage to the filter element.

[0020] The back-blowing vents are at a 45° angle to the horizontal, and the oblique impact force can more effectively blow away dust. The diameter of the back-blowing vents gradually increases from top to bottom, ensuring stable gas flow and impact force at different heights, and ensuring that the entire height of the filter element is effectively cleaned. The number of back-blowing vents on the same horizontal plane is no less than four and they are distributed in a ring at equal intervals, so that all parts of the same circumference of the filter element are impacted, resulting in more comprehensive cleaning.

[0021] The square-shaped housing, combined with the mounting bracket, not only reduces the space occupied by the housing but also makes it easier to fix the housing in place. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model;

[0024] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0025] Figure 3 This is a partial structural schematic diagram of an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the backflush pipe in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the pre-filter in an embodiment of this utility model;

[0028] Figure 6 This is a schematic diagram of the lower drag member in an embodiment of the present utility model. Figure 1 ;

[0029] Figure 7 This is a schematic diagram of the lower drag member in an embodiment of the present utility model. Figure 2 .

[0030] Figure label:

[0031] 1. Pulse valve; 2. Housing; 21. Air outlet pipe; 22. Backflush pipe; 221. Pulse connection port; 222. Backflush air outlet; 223. Sealing plate; 23. Upper snap-fit ​​seat; 24. Air inlet; 3. Mounting bracket; 4. Pre-filter; 41. Support plate; 42. Flanged edge; 43. Through hole; 44. Filter plate; 5. Lower support piece; 51. Lower snap-fit ​​seat; 52. Dust removal hole; 53. Negative pressure chamber; 6. Fan; 7. Filter element. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0033] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and 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 embodiments of the present invention.

[0034] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention should be understood according to the specific circumstances.

[0035] See Figures 1 to 7 As shown, the air filter assembly for backflushing negative pressure dust removal in this embodiment of the utility model includes a housing 2, a backflushing mechanism, and a dust collection mechanism.

[0036] The housing 2 is square in shape, and the top of the housing 2 is fixedly fastened with the air outlet pipe 21 by the upper fastening seat 23.

[0037] The backflush mechanism includes a pulse valve 1 and a backflush pipe 22. The upper end of the backflush pipe 22 is connected to the outlet of the pulse valve 1 via a pulse connection port 221. The pulse valve 1 controls the timing and flow rate of the high-pressure gas. When the pulse valve 1 is open, the high-pressure gas flows out from the outlet of the pulse valve 1 and enters the backflush pipe 22. The lower end of the backflush pipe 22 extends into the inner side of the filter element 7, and several backflush outlet holes 222 are sequentially opened from top to bottom at the lower end of the backflush pipe 22. The high-pressure gas is blown out from the backflush outlet holes 222 and directly impacts the inner wall of the filter element 7. The impact force of the gas blows the dust adhering to the filter element 7 off the outer wall in the opposite direction, causing the dust to detach from the filter element 7 and enter the air inlet chamber.

[0038] The dust collection mechanism includes a lower support 5 and a fan 6. The lower support 5 is located below the housing 2 and includes a lower locking seat 51 and a negative pressure chamber 53. The lower locking seat 51 is fixed to the top of the negative pressure chamber 53, and the lower end of the filter element 7 is fastened to the lower locking seat 51, which stabilizes the filter element 7 and ensures a relative seal between the air inlet chamber and the negative pressure chamber 53. A dust removal hole 52 is provided at the top of the negative pressure chamber 53, communicating with the inside of the chamber. Dust blown down from the filter element 7 and entering the air inlet chamber can enter the negative pressure chamber 53 through the dust removal hole 52. The fan 6 is fixed to the bottom of the negative pressure chamber 53, and the air outlet of the fan 6 is oriented away from the housing 2. When the fan 6 is working, the motor drives the blades to rotate. The rotation of the blades causes airflow and creates negative pressure in the negative pressure chamber 53, so that the dust entering the negative pressure chamber 53 can be blown out from the air outlet of the fan 6, thereby achieving the functions of dust collection and dust removal.

[0039] During operation, clean air filtered by filter element 7 enters the air outlet chamber formed by the inner wall of filter element 7 through the air outlet of filter element 7, and is discharged through air outlet pipe 21, delivering it to equipment requiring clean air. Air inlets 24 are provided on all four sides of the housing 2. Outside air containing dust and impurities enters the air inlet chamber formed by the outer wall of filter element 7 and the inner wall of housing 2 through the air inlets 24. The filter element 7 inside housing 2 filters the air entering the air inlet chamber, allowing only clean air to pass through filter element 7 into the air outlet chamber, and then be discharged through air outlet pipe 21.

[0040] When the fan 6 and pulse valve 1 are turned on, high-pressure gas is blown out from the backflush pipe 22 and hits the inner wall of the filter element 7, blowing the dust filtered on the outer wall of the filter element 7 back into the air intake chamber, and then entering the negative pressure chamber 53 through the dust removal hole 52, and being blown out from the air outlet of the fan 6.

[0041] In this embodiment of the utility model, the backflush outlet 222 on the backflush pipe 22 forms a 45° angle with the horizontal direction, so that when the high-pressure gas blown out from the backflush outlet 222 hits the inner wall of the filter element 7, it can generate an oblique impact force. Compared with vertical blowing, the oblique impact force can more effectively blow off the dust at different positions on the outer wall of the filter element 7, improve the dust cleaning effect of backflush, and avoid some dust being difficult to blow off due to the angle.

[0042] The backflush pipe 22 has backflush outlet holes 222, with the diameter gradually increasing from top to bottom. As the high-pressure gas flows downwards inside the backflush pipe 22, the gas pressure gradually decreases. The gradual increase in the diameter of the backflush outlet holes 222 from top to bottom ensures that the flow rate and impact force of the gas blown out at different heights within the backflush pipe 22 remain relatively stable. Even with reduced gas pressure, increasing the hole diameter allows more gas to be blown out, maintaining effective backflush cleaning of dust at different heights on the inner wall of the filter element 7, ensuring a good backflush cleaning effect throughout the entire filter element 7 from top to bottom.

[0043] The backflush pipe 22 has at least four backflush vents 222 on the same horizontal plane, and these vents are arranged in a ring-shaped, equidistant array. This large number of ring-shaped, equidistant backflush vents 222 ensures that high-pressure gas can be evenly blown from multiple directions onto the inner wall of the filter element 7 at the same horizontal height. This guarantees that all parts of the filter element 7 at the same circumference are impacted by the gas, preventing areas from being missed during backflush cleaning. This improves the comprehensiveness of dust removal along the circumference of the filter element 7 at the same height, resulting in a more thorough backflush cleaning of the filter element 7.

[0044] A pre-filter 4 is provided on all four sides of the housing 2. The pre-filter 4 is located inside the housing 2 and includes a support plate 41 with several through holes 43. A filter plate 44 is fixedly connected to the side of the support plate 41 away from the filter element 7. Before entering the intake chamber, the air containing dust and impurities from the outside is filtered by the pre-filter 4. As the air passes through the through holes 43 on the support plate 41, large dust particles are intercepted by the filter plate 44, which plays a preliminary filtration role, reducing the amount of dust entering the intake chamber, reducing the filtration burden on the filter element 7, and extending the service life of the filter element 7. At the same time, the air entering the housing 2 through the intake hole 24 collides with the pre-filter 4 and is then evenly distributed inside the housing 2, reducing the possibility of localized damage to the filter element 7 caused by gas impact.

[0045] The support plate 41 has flanges 42 formed at both its top and bottom. The upper flange 42 is fixedly connected to the inner top of the housing 2, and the lower flange 42 is fixedly connected to the top of the negative pressure chamber 53. The flanges 42 serve two purposes: firstly, to enhance the structural strength of the support plate 41; and secondly, by fixing the upper and lower flanges to the inner top of the housing 2 and the top of the negative pressure chamber 53 respectively, to ensure the stability of the pre-filter 4 during operation and enable it to continuously and effectively perform its preliminary filtration function.

[0046] The bottom of the backflush pipe 22 is sealed with a sealing plate 223. The sealing plate 223 prevents high-pressure gas from leaking from the bottom of the backflush pipe 22, ensuring that all high-pressure gas is blown out from the backflush outlet 222, concentrating the energy of the gas, ensuring the backflush effect, improving the working efficiency of the backflush mechanism, and enabling the backflush pipe 22 to more effectively blow dust off the filter element 7.

[0047] A mounting bracket 3 is fixedly installed on the housing 2. The mounting bracket 3 securely installs the air filter assembly on the required equipment, facilitating the installation and positioning of the air filter assembly, ensuring the stability of the air filter assembly during operation, and enabling it to operate normally to filter and remove dust from the air.

[0048] The dust removal hole 52 is located between the outer wall of the filter element 7 and the inner wall of the housing 2, so that the dust blown down from the outer wall of the filter element 7 into the air intake cavity can easily enter the negative pressure cavity 53 through the dust removal hole 52 under the action of gravity and the negative pressure generated by the fan 6, ensuring that the dust can be smoothly transferred from the air intake cavity to the dust collection mechanism, thereby improving the dust removal efficiency and dust collection effect of the entire air filter assembly.

[0049] During use, before purging, the fan 6 starts rotating when the pulse valve 1 is energized, creating a negative pressure in the negative pressure chamber 53. High-pressure gas flows out from the outlet of the pulse valve 1 and enters the backflush pipe 22. The lower end of the backflush pipe 22 extends into the inner side of the filter element 7, and several backflush outlet holes 222 are sequentially opened from top to bottom at the lower end of the backflush pipe 22. The high-pressure gas is blown out from the backflush outlet holes 222, directly hitting the inner wall of the filter element 7. The impact force of the gas blows the dust adhering to the filter element 7 off the outer wall, causing the dust to detach from the filter element 7 and enter the air inlet chamber. Then, it enters the negative pressure chamber 53 through the dust removal hole 52 and is blown out from the outlet of the fan 6. After the pulse valve 1 is de-energized, the fan 6 stops rotating, effectively drawing the blown-out dust into the negative pressure chamber and discharging it through the fan 6.

[0050] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. An air filter assembly for reverse-flushing negative pressure dust removal, characterized in that... include: The housing (2) has an air outlet pipe (21) fixedly fastened to its top by an upper fastening seat (23). The housing (2) has air inlets (24) on all four sides. The housing (2) has a filter element (7) inside. The air outlet of the filter element (7) is connected to the air outlet pipe (21). The space enclosed by the inner wall of the filter element (7) forms an air outlet cavity. The space enclosed between the outer wall of the filter element (7) and the inner wall of the housing (2) forms an air inlet cavity. The backflush mechanism includes a pulse valve (1) and a backflush pipe (22). The upper end of the backflush pipe (22) is connected to the air outlet of the pulse valve (1) through a pulse connection port (221). The lower end of the backflush pipe (22) extends into the inner side of the filter element (7). The lower end of the backflush pipe (22) is provided with a plurality of backflush air outlet holes (222) from top to bottom. The dust collection mechanism includes a lower support (5) and a fan (6). The lower support (5) is located below the housing (2). The lower support (5) includes a lower fastening seat (51) and a negative pressure chamber (53). The lower fastening seat (51) is fixed to the top of the negative pressure chamber (53). The lower end of the filter element (7) is fastened to the lower fastening seat (51). The top of the negative pressure chamber (53) is provided with a dust removal hole (52) that communicates with the inside of the negative pressure chamber (53). The fan (6) is fixed to the bottom of the negative pressure chamber (53). The air outlet of the fan (6) is set in a direction away from the housing (2).

2. The air filter assembly for reverse-flushing negative pressure dust removal according to claim 1, characterized in that: The backflush outlet (222) on the backflush pipe (22) forms a 45° angle with the horizontal direction.

3. The air filter assembly for reverse-flushing negative pressure dust removal according to claim 1, characterized in that: The backflush pipe (22) has backflush vents (222) with the diameter gradually increasing from top to bottom.

4. The air filter assembly for reverse-flushing negative pressure dust removal according to claim 1, characterized in that: The backflush pipe (22) has at least four backflush vents (222) on the same horizontal plane, and the backflush vents (222) on the same horizontal plane are arranged in a ring-shaped equidistant array.

5. The air filter assembly for reverse-flushing negative pressure dust removal according to claim 1, characterized in that: The housing (2) has a front filter (4) on all four sides. The front filter (4) is located inside the housing (2). The front filter (4) includes a support plate (41). The support plate (41) has several through holes (43). A filter plate (44) is fixedly connected to the side of the support plate (41) away from the filter element (7).

6. The air filter assembly for reverse-flushing negative pressure dust removal according to claim 5, characterized in that: The support plate (41) has flanges (42) formed at both the top and bottom. The upper flange (42) is fixedly connected to the inner top of the shell (2), and the lower flange (42) is fixedly connected to the top of the negative pressure cavity (53).

7. The air filter assembly for reverse-flushing negative pressure dust removal according to claim 1, characterized in that: The bottom of the backflush pipe (22) is sealed with a sealing plate (223).

8. The air filter assembly for reverse-flushing negative pressure dust removal according to claim 1, characterized in that: A mounting bracket (3) is fixedly installed on the housing (2).

9. The air filter assembly for reverse-flushing negative pressure dust removal according to claim 1, characterized in that: The dust removal hole (52) is located between the outer wall of the filter element (7) and the inner wall of the housing (2).

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