Low-frequency acoustic agglomeration oil mist filter

Abstract

The utility model discloses a low-frequency sound wave agglomeration oil mist filter which comprises an agglomeration chamber, a first sound wave generating mechanism is arranged at the axial front end of the agglomeration chamber, a second sound wave generating mechanism is arranged at the axial rear end of the agglomeration chamber, and the second sound wave generating mechanism and the first sound wave generating mechanism are arranged in a mirror symmetry mode. The agglomeration chamber comprises a square-tube-shaped agglomeration chamber shell, and an inner cavity of the agglomeration chamber shell is an agglomeration cavity. An air inlet is formed in the upper side wall of the agglomeration chamber shell, is close to the axial front end of the agglomeration chamber shell and is communicated with the agglomeration cavity; an air outlet is further formed in the upper side wall of the agglomeration chamber shell, is close to the axial rear end of the agglomeration chamber shell and is communicated with the agglomeration cavity. The first sound wave generating mechanism comprises a first horn, and the two ends of the first horn are connected with the axial front end of the agglomeration chamber shell and the first compression type driver correspondingly. And the oil mist liquid drops are promoted to collide with one another and grow up by utilizing the entrainment effect of low-frequency sound waves, so that the purification efficiency of oil mist particles is improved.

Description

Technical Field

[0001] This utility model belongs to the field of particulate purification technology, and relates to oil mist filters, specifically a low-frequency acoustic agglomeration oil mist filter. Background Technology

[0002] The processing of aluminum and copper materials often involves rolling, cutting, or wire drawing. During these processes, metalworking fluids and lubricating oils are sprayed onto the rollers and cutting tools to improve efficiency and protect the tools. After atomization and condensation, these oils form small oil mist droplets, which are then treated by local or centralized purification devices before being released into the atmosphere.

[0003] While these purification devices are highly efficient at removing large droplets, a common drawback is their low efficiency in removing micron- and submicron-sized droplets. If these small droplets are not controlled, when they diffuse in indoor and outdoor environments, they can not only harm human skin, causing allergic dermatitis, but also accumulate deep within the respiratory system, leading to various respiratory diseases and even inducing cancer. Furthermore, when oil mist diffuses into the environment, it can adhere to equipment surfaces, reducing equipment lifespan, blocking ventilation systems, causing greater energy consumption, and encasing electrical circuits, potentially leading to fires.

[0004] Mechanical filtration is a common industrial method for oil mist purification. It involves introducing pollutants into the filter media along with the airflow, utilizing the media's porous structure to trap the pollutants. Filter materials can be categorized into natural and synthetic materials. Natural materials include natural fibers and metal mesh, while synthetic materials include synthetic filter paper, fiber remnants, and artificial polymers. The efficiency of a filtration purifier is primarily affected by the performance of the filter media; the quality of the media directly impacts the overall filter performance. Generally, metal mesh filter media achieves excellent purification of large-diameter oil mist particles, but its purification effect is lower for oil mist particles smaller than 5μm. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a low-frequency acoustic agglomeration oil mist filter to solve the technical problem that the purification effect of existing oil mist filters for oil mist particles with a particle size of less than 5μm needs to be further improved.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A low-frequency acoustic agglomeration oil mist filter includes an agglomeration chamber. A first acoustic wave generating mechanism is provided at the axial front end of the agglomeration chamber, and a second acoustic wave generating mechanism is provided at the axial rear end of the agglomeration chamber. The second acoustic wave generating mechanism and the first acoustic wave generating mechanism are arranged in a mirror-symmetrical manner in the axial direction.

[0008] The agglomeration chamber includes a square tubular agglomeration chamber shell, and the cavity inside the agglomeration chamber shell is an agglomeration cavity.

[0009] An air inlet is provided on the upper side wall of the agglomeration chamber shell, the air inlet is close to the axial front end of the agglomeration chamber shell, and the air inlet is connected to the agglomeration cavity; an air outlet is also provided on the upper side wall of the agglomeration chamber shell, the air outlet is close to the axial rear end of the agglomeration chamber shell, and the air outlet is connected to the agglomeration cavity.

[0010] The first sound wave generating mechanism includes a first horn, the open end of which can be connected to the axial front end of the agglomeration chamber shell, and the throat end of the first horn is connected to a first compression actuator.

[0011] This utility model also has the following technical features:

[0012] Specifically, the side wall of the agglomeration chamber shell is also provided with a front particle number detection port, a sound pressure level and wind speed detection port and a rear particle number detection port, which are evenly arranged from front to back along the axial direction between the air inlet and the air outlet.

[0013] One end of the aforementioned front-end particle count detection port can be connected to the aggregation cavity, and the other end of the front-end particle count detection port can be opened or closed.

[0014] One end of the sound pressure level and wind speed detection port can be connected to the aggregation cavity, and the other end of the sound pressure level and wind speed detection port can be opened or closed.

[0015] One end of the rear particle number detection port can be connected to the aggregation cavity, and the other end of the rear particle number detection port can be opened or closed.

[0016] Specifically, the central axis of the air inlet and the central axis of the air outlet are located in the same vertical plane and are both perpendicular to the central axis of the agglomeration cavity.

[0017] The right-angled channel formed by the air outlet and the agglomeration cavity is the oil mist particle interception section.

[0018] Specifically, the second sound wave generating mechanism includes a second horn, the open end of which can be connected to the axial rear end of the aggregation chamber shell, and the throat end of the second horn is connected to a second compression actuator.

[0019] Specifically, the open end of the first horn is connected to the axial front end of the agglomeration chamber shell via a first flange.

[0020] The open end of the second horn is connected to the axial rear end of the agglomeration chamber shell via a second flange.

[0021] Specifically, sound-absorbing sponge is also provided on the outer surface of the agglomeration chamber shell.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] (I) The device in this utility model has a first sound wave generating mechanism and a second sound wave generating mechanism arranged mirror-symmetrically at both ends of the agglomeration cavity, thereby enabling the formation of a stable standing wave in the agglomeration cavity, and thus enabling efficient and stable agglomeration of oil mist particles.

[0024] (II) The device in this invention utilizes the entrainment effect of low-frequency sound waves to promote the collision and growth of oil mist droplets, thereby improving the purification efficiency of oil mist particles.

[0025] (III) The air inlet and air outlet of this utility model device are both set on the upper side wall of the agglomeration chamber shell, and the central axis of the air inlet and the central axis of the air outlet are perpendicular to the central axis of the agglomeration chamber. The purpose is to use the inertial effect of the oil mist particles to remove some large-diameter oil mist particles at the right-angle corner connecting the agglomeration chamber and the air outlet, so as to increase the overall efficiency of the filter. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the main structure of the device in this utility model.

[0027] Figure 2 This is a top view of the device in this utility model.

[0028] The meanings of the labels in the diagram are as follows: 1-aggregation chamber, 2-first sound wave generating mechanism, 3-second sound wave generating mechanism, 4-first flange, 5-second flange, 6-sound absorbing sponge.

[0029] 101 - Aggregation chamber shell, 102 - Aggregation cavity.

[0030] 201 - First horn, 202 - First compression drive.

[0031] 301 - Second horn, 302 - Second compression drive.

[0032] 10101-Air inlet, 10102-Air outlet, 10103-Front-end particle count detection port, 10104-Sound pressure level and wind speed detection port, 10105-Rear-end particle count detection port.

[0033] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, all devices and components in this invention are based on existing technologies. For example, the signal generator uses a known signal generator, and the oil mist generator uses a known oil mist generator.

[0035] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0036] Example:

[0037] This embodiment provides a low-frequency acoustic agglomeration oil mist filter, such as... Figures 1 to 2 As shown, it includes a coalescence chamber 1, a first sound wave generating mechanism 2 is provided at the front end of the coalescence chamber 1, and a second sound wave generating mechanism 3 is provided at the rear end of the coalescence chamber 1. The second sound wave generating mechanism 3 and the first sound wave generating mechanism 2 are arranged in a mirror-symmetrical manner in the axial direction.

[0038] like Figures 1 to 2 As shown, the aggregation chamber 1 includes a square tubular aggregation chamber shell 101, and the cavity inside the aggregation chamber shell 101 is an aggregation cavity 102.

[0039] like Figures 1 to 2 As shown, an air inlet 10101 is provided on the upper side wall of the agglomeration chamber shell 101. The air inlet 10101 is close to the axial front end of the agglomeration chamber shell 101 and is connected to the agglomeration cavity 102. An air outlet 10102 is also provided on the upper side wall of the agglomeration chamber shell 101. The air outlet 10102 is close to the axial rear end of the agglomeration chamber shell 101 and is connected to the agglomeration cavity 102.

[0040] like Figures 1 to 2 As shown, the first sound wave generating mechanism 2 includes a first horn 201, the open end of which can be connected to the axial front end of the aggregation chamber shell 101, and the throat end of the first horn 201 is connected to the first compression driver 202.

[0041] In this embodiment, both the first sound wave generating mechanism 2 and the second sound wave generating mechanism 3 are capable of generating low-frequency adjustable sound waves from 0 to 5000 Hz.

[0042] In this embodiment, the cross-section of the air inlet 10101 and the cross-section of the air outlet 10102 are both circular.

[0043] As a preferred embodiment of this invention, such as Figures 1 to 2 As shown, the side wall of the agglomeration chamber shell 101 is also provided with a front particle number detection port 10103, a sound pressure level and wind speed detection port 10104 and a rear particle number detection port 10105. The front particle number detection port 10103, the sound pressure level and wind speed detection port 10104 and the rear particle number detection port 10105 are evenly arranged from front to back along the axial direction between the air inlet 10101 and the air outlet 10102.

[0044] One end of the front-end particle number detection port 10103 can be connected to the agglomeration cavity 102, and the other end of the front-end particle number detection port 10103 can be opened or closed.

[0045] One end of the sound pressure level and wind speed detection port 10104 can be connected to the aggregation cavity 102, and the other end of the sound pressure level and wind speed detection port 10104 can be opened or closed.

[0046] One end of the rear particle number detection port 10105 can be connected to the agglomeration cavity 102, and the other end of the rear particle number detection port 10105 can be opened or closed.

[0047] In this embodiment, the other end of the front particle number detection port 10103 and the other end of the rear particle number detection port 10105 are in a closed state when they are not connected to external oil mist particle number concentration detection devices of various particle size ranges.

[0048] In this embodiment, the external oil mist particle number concentration detection equipment for each particle size range adopts commonly used oil mist particle number concentration detection equipment for each particle size range known in the art.

[0049] In this embodiment, the other end of the sound pressure level and wind speed detection port 10104 is in a closed state when it is not connected to an external wind speed detector or an external sound pressure meter.

[0050] In this embodiment, the external wind speed detector is a commonly used wind speed detector known in the art; the external sound pressure meter is a commonly used sound pressure meter known in the art.

[0051] In this embodiment, the distance between the front-end particle number detection port 10103 and the sound pressure level and wind speed detection port 10104 is 0.4m; the distance between the sound pressure level and wind speed detection port 10104 and the rear-end particle number detection port 10105 is 0.4m.

[0052] In this embodiment, when measuring the wind speed inside the agglomeration cavity 102, the other end of the sound pressure level and wind speed detection port 10104 is connected to an external anemometer to realize the measurement of the wind speed inside the agglomeration cavity 102; when measuring the sound pressure level inside the agglomeration cavity 102, the other end of the sound pressure level and wind speed detection port 10104 is connected to an external sound pressure meter to realize the measurement of the sound pressure level inside the agglomeration cavity 102.

[0053] In this embodiment, the external wind speed detector is a commonly used wind speed detector known in the art; the external sound pressure meter is a commonly used sound pressure meter known in the art.

[0054] As a preferred embodiment of this invention, such as Figures 1 to 2 As shown, the central axis of the air inlet 10101 and the central axis of the air outlet 10102 are located in the same vertical plane and are both perpendicular to the central axis of the agglomeration cavity 102.

[0055] The right-angle corner channel formed by the air outlet 10102 and the agglomeration cavity 102 is the oil mist particle interception section.

[0056] In this embodiment, the oil mist generated by the oil mist generator enters from the air inlet 10101 and flows out from the air outlet 10102. The sound field direction inside the agglomeration cavity 102 is parallel to the direction of the oil mist between the air inlet 10101 and the air outlet 10102, so as to enhance the particle disturbance within the oil mist.

[0057] As a preferred embodiment of this invention, such as Figures 1 to 2 As shown, the second sound wave generating mechanism 3 includes a second horn 301, the open end of which can be connected to the axial rear end of the aggregation chamber housing 101, and the throat end of the second horn 301 is connected to the second compression driver 302.

[0058] As a preferred embodiment of this invention, such as Figures 1 to 2 As shown, the open end of the first horn 201 is connected to the axial front end of the agglomeration chamber shell 101 via the first flange 4.

[0059] like Figures 1 to 2 As shown, the open end of the second horn 301 is connected to the axial rear end of the agglomeration chamber shell 101 via the second flange 5.

[0060] As a preferred embodiment of this invention, such as Figures 1 to 2 As shown, a sound-absorbing sponge 6 is also provided on the outer surface of the agglomeration chamber shell 101.

[0061] In this embodiment, the sound-absorbing sponge 6 is used to achieve noise reduction.

[0062] In this embodiment, an external signal generator is used to generate low-frequency sine waves, triangle waves, and square waves. Compared to high-frequency sound waves, low-frequency sound waves are less affected by the gas medium during transmission and attenuate slowly, making them suitable for long-distance transmission. The signals generated by the external signal generator are transmitted to an external power amplifier, which amplifies the waveform generated by the signal source and then transmits them to the first compression driver 202 and the second compression driver 302, respectively. The first compression driver 202 transmits the signal directionally into the aggregation cavity 102 through the first horn 201, and the second compression driver 302 transmits the signal directionally into the aggregation cavity 102 through the second horn 301.

[0063] In this embodiment, the external signal generator is a commonly known signal generator in the art; the external power amplifier is a commonly known power amplifier in the art.

[0064] In this embodiment, before using an external fan to blow clean the agglomeration chamber 102, the first sound wave generating mechanism 2 and the second sound wave generating mechanism 3 need to be removed from the agglomeration chamber shell 101, and the external fan is connected to the axial front end of the agglomeration chamber shell 101 so that the air volume generated by the external fan can blow clean the agglomeration chamber 102 from front to back along the axial direction.

[0065] The experimental results of the device in this embodiment are obtained by comparing the number concentration differences of oil mist particles in different particle size ranges before and after the agglomeration chamber 102 along the axial direction. The specific steps include:

[0066] Error elimination before use of the device in this embodiment: With the sound wave off, connect one end of the external fan to the air inlet 10101 and turn on the external fan, measuring the wind speed inside the agglomeration chamber 102. When the airflow inside the agglomeration chamber 102 stabilizes, turn on the oil mist generator connected to the other end of the external fan and feed it through the air inlet 10101. After the oil mist-containing airflow stabilizes, measure the oil mist particle number concentration of each particle size segment at the axial front end near the agglomeration chamber 102 through the front particle number detection port 10103, and measure the oil mist particle number concentration of each particle size segment at the axial rear end near the agglomeration chamber 102 through the rear particle number detection port 10105. To avoid errors, three sets of data are measured through the front particle number detection port 10103 and the rear particle number detection port 10105 respectively, and the average value is taken, with each set sampled for 10 seconds. The number concentrations of each particle size segment before and after the axial direction of the agglomeration chamber 102 were compared as a control experiment to eliminate the influence of the agglomeration chamber 102 on the oil mist particles.

[0067] The working process of the device in this embodiment is as follows: First, remove the first sound wave generating mechanism 2 and the second sound wave generating mechanism 3 from the agglomeration chamber shell 101. Then, connect the external fan to the axial front end of the agglomeration chamber shell 101 and turn on the external fan to increase the air volume and blow clean the agglomeration cavity 102. After blowing clean, remove the external fan from the axial front end of the agglomeration chamber shell 101. Then, connect one end of the external fan to the air inlet 10101 and the other end of the external fan to the oil mist generator. Then, install the first sound wave generating mechanism 2 and the second sound wave generating mechanism 3 onto the agglomeration chamber shell 101. Then, adjust the air volume of the external fan connected to the air inlet 10101 so that the wind speed measured in the agglomeration cavity 102 at this time is equal to the wind speed measured in the agglomeration cavity 102 when the device in this embodiment was used for error elimination. Once the airflow stabilizes, the oil mist generator is turned on and feed is initiated through the air inlet 10101. After the oil mist-laden airflow stabilizes, the parameters of the signal generator are adjusted, and the sound wave is activated. An external sound pressure meter measures the sound pressure level within the agglomeration chamber 102 through the sound pressure level and wind speed detection port 10104, and the sound pressure level is adjusted by adjusting the parameters of the power amplifier. After the sound wave stabilizes, the number concentration of oil mist particles in each particle size segment along the axial direction before and after the agglomeration chamber 102 is measured through the front particle number detection port 10103 and the rear particle number detection port 10105. Three sets of data are measured, and the average value is taken. The number concentration of oil mist particles in each particle size segment along the axial direction before and after the agglomeration chamber 102 is compared, and the agglomeration efficiency is calculated.

[0068] Experimental results: As the frequency increases, the reduction rate of oil mist particle number concentration reaches its maximum at 1800 Hz. The device in this embodiment can reduce the number concentration of oil mist particles smaller than 5 μm by 8.75%. Thereafter, the reduction effect gradually weakens with increasing frequency. When the frequency reaches 2800 Hz, the overall reduction rate is the smallest, only 2%.

[0069] Under the influence of a 140dB sound wave with a residence time of 3s, the agglomeration effect varies significantly with frequency. Agglomeration is generally poor for oil mist droplets smaller than 1μm, while it is better for droplets between 1 and 5μm. For oil mist droplets larger than 5μm, the agglomeration effect is most pronounced at a sound wave frequency of 1800Hz. Therefore, selecting a low-frequency sound wave of 1800Hz yields the best results during the agglomeration process.

[0070] After acoustic treatment, the concentration of oil mist particles in the oil mist-containing airflow exiting from the air outlet 10102 is significantly reduced. This is because the oil mist particles collide and agglomerate into larger particles under the influence of acoustic waves, thus reducing the overall concentration. Furthermore, the larger particles, due to their greater gravity, settle within the agglomeration chamber 102. Simultaneously, as these larger particles flow out of the air outlet 10102 through the agglomeration chamber, they are intercepted by the right-angle corner-shaped oil mist particle interception section due to their greater inertia, resulting in a significant reduction in the concentration of oil mist particles exiting from the air outlet 10102.

Claims

1. A low-frequency acoustic agglomeration oil mist filter, characterized in that, It includes a coalescence chamber (1), wherein a first sound wave generating mechanism (2) is provided at the front end of the coalescence chamber (1) and a second sound wave generating mechanism (3) is provided at the rear end of the coalescence chamber (1). The second sound wave generating mechanism (3) and the first sound wave generating mechanism (2) are arranged in a mirror-symmetrical manner in the axial direction. The agglomeration chamber (1) includes a square tubular agglomeration chamber shell (101), and the cavity inside the agglomeration chamber shell (101) is an agglomeration cavity (102); An air inlet (10101) is provided on the upper side wall of the agglomeration chamber shell (101), the air inlet (10101) is close to the axial front end of the agglomeration chamber shell (101), and the air inlet (10101) is connected to the agglomeration cavity (102); an air outlet (10102) is also provided on the upper side wall of the agglomeration chamber shell (101), the air outlet (10102) is close to the axial rear end of the agglomeration chamber shell (101), and the air outlet (10102) is connected to the agglomeration cavity (102); The first sound wave generating mechanism (2) includes a first horn (201), the open end of which can be connected to the axial front end of the aggregation chamber shell (101), and the throat end of the first horn (201) is connected to a first compression driver (202).

2. The low-frequency acoustic agglomeration oil mist filter as described in claim 1, characterized in that, The agglomeration chamber shell (101) is also provided with a front particle number detection port (10103), a sound pressure level and wind speed detection port (10104) and a rear particle number detection port (10105) respectively on its side wall. The front particle number detection port (10103), the sound pressure level and wind speed detection port (10104) and the rear particle number detection port (10105) are evenly arranged from front to back along the axial direction between the air inlet (10101) and the air outlet (10102). One end of the front-end particle number detection port (10103) can be connected to the agglomeration cavity (102), and the other end of the front-end particle number detection port (10103) can be opened or closed; One end of the sound pressure level and wind speed detection port (10104) can be connected to the aggregation cavity (102), and the other end of the sound pressure level and wind speed detection port (10104) can be opened or closed; One end of the rear particle number detection port (10105) can be connected to the agglomeration cavity (102), and the other end of the rear particle number detection port (10105) can be opened or closed.

3. The low-frequency acoustic agglomeration oil mist filter as described in claim 1, characterized in that, The central axis of the air inlet (10101) and the central axis of the air outlet (10102) are located in the same vertical plane and are both perpendicular to the central axis of the agglomeration cavity (102); The right-angle corner channel formed by the air outlet (10102) and the agglomeration cavity (102) is an oil mist particle interception section.

4. The low-frequency acoustic agglomeration oil mist filter as described in claim 1, characterized in that, The second sound wave generating mechanism (3) includes a second horn (301), the open end of which can be connected to the axial rear end of the aggregation chamber shell (101), and the throat end of the second horn (301) is connected to a second compression driver (302).

5. The low-frequency acoustic agglomeration oil mist filter as described in claim 4, characterized in that, The open end of the first horn (201) is connected to the axial front end of the agglomeration chamber shell (101) via the first flange (4); The open end of the second horn (301) is connected to the axial rear end of the agglomeration chamber shell (101) via a second flange (5).

6. The low-frequency acoustic agglomeration oil mist filter as described in claim 1, characterized in that, The outer surface of the agglomeration chamber shell (101) is also provided with sound-absorbing sponge (6).

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