Oil mist filtering and discharging system and oil mist interceptor

Abstract

The invention relates to the technical field of oil mist treatment, in particular to an oil mist filtering and discharging system and an oil mist interceptor. Wherein the oil mist filtering and discharging system comprises a main air pipe and a branch air pipe, and an air outlet of the main air pipe is connected with a main fan; the air outlet ends of the branch air pipes are connected with the main air pipe, the air inlet ends of the branch air pipes are connected with oil mist generation equipment, and each branch air pipe is provided with an oil mist interceptor; the main fan is arranged on the main air pipe, and the oil mist purification system is used for filtering oil mist and then discharging the filtered oil mist to the external environment. The oil mist interceptor comprises a shell; an intercepting turntable is rotationally arranged in the shell; a plurality of radially-distributed intercepting spokes are arranged on the intercepting rotating disc, an oil storage groove which is sunken downwards is formed in the bottom of the inner wall of the shell, and an oil discharging opening is formed in the oil storage groove. According to the technical scheme, pollutants in oil mist are preliminarily intercepted through the oil mist interceptor, deposition of oil stains in the air pipe is reduced, and the treatment pressure of an oil mist purification system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil mist treatment, and particularly to an oil mist filtration and emission system and an oil mist interceptor. Background Art

[0002] During the mechanical processing production process, some production steps will mix liquid pollutants with air to form oil mist that pollutes the environment. For example, when a machine tool uses an oil-based cutting fluid for processing, the cutting fluid is atomized by the agitation of a high-speed rotating tool to form a mixed oil mist of cutting fluid and air. The atomized paint that is not attached to the workpiece surface during the painting process will float in the air to form oil mist. The stretching oil used in stretch forming will be heated and atomized to form oil mist during the processing.

[0003] In the early mechanical processing production process, the treatment and emission of oil mist were relatively rough. For the oil mist generated during machine tool cutting and stretch forming, it was usually directly dispersed into the workshop without treatment, and then an exhaust fan was installed on the workshop to conduct air exchange. The oil mist would disperse in the workshop and then be directly discharged to the external environment by the exhaust fan. For the oil mist generated during painting operations, the treatment would be more meticulous. Painting is usually arranged in a dedicated painting room or a closed painting cabinet, and the oil mist containing paint is directly passed through a filter by an induced draft fan and then discharged to the external environment.

[0004] This simple and crude treatment method will pollute the environment on the one hand and affect the health of the operators on the production line on the other hand. Oil mist usually contains various chemical substances, and suspending in the workshop will cause harm to the respiratory system and skin health. In addition, the direct emission of oil mist will also shorten the service life of the workshop equipment and even pose a safety hazard. Summary of the Invention

[0005] In view of the above deficiencies or defects in the prior art, the first aspect of the present invention provides an oil mist filtration and emission system, which can reduce the deposition of oil stains in the air duct, avoid the blockage or increased vibration of the air duct, greatly extend the maintenance cycle of the air duct and the oil mist purification system, extend the service life of the filter element and activated carbon consumables in the oil mist purification system, and reduce the consumable cost and replacement cost.

[0006] An oil mist filtration and emission system, comprising:

[0007] An air duct, including a main air duct and a plurality of branch air ducts. The air outlet of the main air duct is connected to a main fan; the air outlet end of the branch air duct is connected to the main air duct, and the air inlet end of the branch air duct is connected to an oil mist generating device. An oil mist interceptor is provided on each branch air duct.

[0008] A main fan, whose air outlet is connected to an oil mist purification system, for passing the oil mist in the main air duct into the oil mist purification system.

[0009] An oil mist purification system is used to filter the oil mist and discharge it into the external environment.

[0010] An oil mist interceptor includes a housing with an air inlet and an air outlet respectively connected to branch air ducts, and an air flow channel is formed inside the housing; an intercepting turntable is rotatably installed inside the housing, and the driving motor is connected to and drives the intercepting turntable to rotate; the intercepting turntable has a plurality of intercepting spokes distributed radially, and the oil mist entering the air flow channel from the air inlet passes through the rotating intercepting turntable and flows out from the air outlet; a downwardly concave oil storage tank is formed at the bottom of the inner wall of the housing, and the oil storage tank is provided with an oil drain port.

[0011] In some embodiments, a motor bracket is arranged inside the housing, the driving motor is fixed on the motor bracket, and the output shaft of the driving motor is connected to the intercepting turntable; the driving motor is arranged on one side of the intercepting turntable close to the air outlet of the housing.

[0012] In some embodiments, the intercepting turntable includes a mounting shaft, intercepting spokes and an outer ring frame, the inner ends of the intercepting spokes are fixed on the mounting shaft, and the outer ends are connected to the outer ring frame;

[0013] The mounting shaft is connected to the output shaft of the driving motor;

[0014] The outer ring frame is annular, a guiding groove surrounding the outer ring frame is formed on the inner edge of the outer ring, and the guiding groove includes a number of guiding holes penetrating from the guiding groove through the outer ring frame to the outer edge of the outer ring frame;

[0015] The outer ends of the intercepting spokes are fixed on the guiding groove of the outer ring frame, and the intercepting spokes are perpendicular to the air flow direction inside the housing.

[0016] In some embodiments, a recovery container is arranged at the oil mist generating device, the outlet of the oil drain port is connected to a U-shaped liquid seal, the outlet of the U-shaped liquid seal is connected to a downwardly extending drain pipe, and the bottom of the drain pipe communicates with the recovery container.

[0017] In some embodiments, the main air duct is arranged at the top of the workshop where the oil mist generating device is located; the branch air duct includes an upwardly extending rising part, the bottom of the rising part is connected to the oil mist generating device, and the oil mist in the rising part moves upward;

[0018] The oil mist interceptor is arranged in the rising part of the branch air duct.

[0019] In some embodiments, independent induced draft fans are arranged at the air inlets of the branch air ducts, the air inlets of the induced draft fans communicate with the oil mist generating devices, the outlets of the induced draft fans are connected to the inlets of the branch air ducts, and check valves are arranged on the branch air ducts to prevent air from flowing back;

[0020] An oil mist concentration sensor is arranged on the oil mist generating device, the oil mist concentration sensor is electrically connected to the induced draft fan and controls the working power of the induced draft fan; the detection result of the oil mist concentration sensor is positively correlated with the power of the induced draft fan.

[0021] In some embodiments, the air outlet of the oil mist interceptor is connected to an expansion duct, and the diameter of the expansion duct gradually increases from the outlet of the oil mist interceptor.

[0022] In some embodiments, the oil mist purification system includes an oil mist purifier and an adsorber. The oil mist purifier is connected to the main fan through a duct. The air outlet of the oil mist purifier is connected to the adsorber, and the air outlet of the adsorber communicates with the atmosphere.

[0023] The oil mist purifier is a filter type oil mist purifier or an electrostatic adsorption type oil mist purifier.

[0024] The adsorber is an activated carbon adsorption tower.

[0025] In some embodiments, the main air duct is horizontally arranged and is composed of a plurality of pipe segments connected end to end.

[0026] Both ends of the pipe segment are provided with flanges extending outward perpendicular to the axis of the pipe segment, and a sealing material is filled in the gap between the flanges of adjacent pipe segments to seal the gap.

[0027] L-shaped corner codes are respectively arranged on the outer sides of adjacent flanges. The vertical sides of the L-shaped corner codes are closely attached to the flanges, and the horizontal sides are closely attached to the outer wall of the pipe segment.

[0028] The two L-shaped corner codes are connected by bolts and clamp the flange between the L-shaped corner codes. One side of the L-shaped corner code is closely attached to the flange, and the other side is closely attached to the outer wall of the pipe segment.

[0029] A baffle is arranged at the joint of the pipe segments. The baffle is annularly arranged around the joint of the pipe segments, and the baffle is closely attached to the inner walls of the pipe segments on both sides of the joint.

[0030] The baffle is riveted and fixed to the horizontal side of the L-shaped corner code, and the baffle and the horizontal side of the L-shaped corner code clamp the pipe segment wall in the middle.

[0031] The present invention also provides an oil mist interceptor, which can preliminarily intercept and separate oil mist. Installing it at the air outlet of the oil mist generating device or on the branch air duct of the exhaust system can effectively reduce the oil stain deposition in the air duct.

[0032] Specifically, the oil mist interceptor includes a housing, an interception turntable and a driving motor. The housing is provided with an air inlet and an air outlet, and an air flow channel is formed inside the housing; the interception turntable is rotatably arranged inside the housing.

[0033] A motor bracket is arranged inside the housing, the driving motor is fixed on the motor bracket, and the output shaft of the driving motor is connected to the interception turntable; the driving motor is arranged on one side of the interception turntable close to the air outlet of the housing.

[0034] The intercepting turntable includes a mounting shaft, intercepting spokes, and an outer ring frame; the mounting shaft is connected to the output shaft of the driving motor; a plurality of intercepting spokes are radially fixed on the mounting shaft, the outer ends of the intercepting spokes are connected to the outer ring frame, and the intercepting spokes are perpendicular to the air flow direction inside the housing; the outer ring frame is annular, a guiding groove surrounding the outer ring frame is provided on the inner edge of the outer ring, and the guiding groove includes a number of guiding holes that penetrate from the guiding groove through the outer ring frame to the outer edge of the outer ring frame; the outer ends of the intercepting spokes are fixed on the guiding groove of the outer ring frame;

[0035] At the bottom of the inner wall of the housing, an oil storage tank that is recessed downward is formed, and the oil storage tank is provided with an oil drain port to drain the oil stain.

[0036] Applying the oil mist filtration and emission system of the present invention has the following effects:

[0037] There are mainly three treatment methods for the oil mist generated during the machining process:

[0038] (1) An oil mist collection system is set on the machine tool and the airtight painting cabinet. Currently, some high-end machine tools (such as CNC machine tools, turning centers, grinders, etc.) are equipped with built-in oil mist collectors, and usually there are exhaust ports on the upper part or side of the machine tool to directly extract the oil mist generated during the processing.

[0039] (2) An external independent oil mist collector is connected. If the machine tool itself does not have an exhaust device, factories usually install an independent oil mist purifier, which is connected to the protective cover or the inside of the machine shell of the machine tool through a pipeline to suck away and filter the oil mist.

[0040] (3) An oil mist exhaust system is set. The exhaust pipe is directly connected to the machine tool and painting equipment that generate oil mist to extract the oil mist for treatment in the production workshop.

[0041] The first two treatment methods require updating the equipment or modifying the existing equipment. If the number of equipment in the factory area is large, the comprehensive cost will be very high. Therefore, for large-scale processing plants, they are more inclined to set up an oil mist exhaust system.

[0042] However, in actual use, a large amount of oil stain will quickly accumulate in the air duct. These oil stains will cause the cross-sectional area of the air duct to become smaller, affecting the normal flow of the oil mist gas. Since the oil stain adheres to the pipe wall, it will also cause the turbulence in the air duct to intensify and the air duct to vibrate. Even more, the relatively fluid oil mist will corrode the joints of the air duct, affecting the airtightness of the air duct, resulting in the leakage of the oil mist gas, and even the leakage of the relatively fluid oil stain.

[0043] The main air duct of the present invention is connected to the oil mist generating device through a branch air duct, and the oil mist generated from the oil mist generating device flows through the branch air duct to the main air duct. The diameter of the main air duct is much larger than that of the branch air duct, and the flow velocity of the oil mist gas decreases at the main air duct. The pollutant droplets in the oil mist are likely to settle at the main air duct and adhere to the inner wall of the main air duct. Therefore, the present invention provides an oil mist interceptor on the branch air duct to preliminarily intercept the oil mist. After being intercepted by the oil mist interceptor, it is preliminarily purified and then flows from the branch air duct to the main air duct, and then flows through the main air duct to the oil mist purification system.

[0044] After the oil mist is preliminarily treated by the oil mist interceptor, the concentration of the pollutant droplets in the oil mist drops significantly. The amount of oil stains deposited in the main air duct is greatly reduced, and the concentration of pollutants contained in the oil mist is also greatly reduced, significantly reducing the working load of the oil mist purification system. Equipment with a lower oil mist purification treatment capacity can be used, reducing the equipment procurement cost and the floor area occupied by the installation of the oil mist purification system. Moreover, the replacement cycle of the filter element and the activated carbon for adsorbing odors in the oil mist purification system can be extended.

[0045] The larger the diameter of the oil mist droplets, the easier it is for them to be intercepted by the oil mist interceptor. Therefore, the average diameter of the oil mist droplets in the main air duct is smaller, which is more conducive to the droplets flowing in a suspended form and reducing the settlement of the oil mist droplets in the main air duct.

[0046] The oil mist interceptor of the present invention forms an air flow channel by using a housing, and an interception turntable is arranged in the air flow channel. The oil mist gas needs to pass through the interception turntable to reach the outlet of the oil mist interceptor. The interception turntable includes a plurality of interception spokes distributed radially. When the interception turntable rotates at a high speed. The interception spokes collide with the droplets in the oil mist, and most of the droplets in contact with the interception spokes will be captured by the interception spokes. Under the action of centrifugal motion, the oil mist droplets are thrown from the interception spokes to the housing. Under the action of gravity, the oil mist flows along the inner wall of the housing to the oil storage tank and then is discharged from the oil drain port. A small part of the droplets impacted by the interception spokes will be broken up into smaller droplets.

[0047] The oil mist interceptor of the present invention does not include consumables and structures such as filter elements and filter meshes that need to be replaced and cleaned regularly, but intercepts the oil mist by using interception spokes. The entire device does not need to be cleaned for a long time. As long as the motor and bearings do not fail, it can ensure normal operation. Although the filtering effect of this oil mist interceptor is not as good as that of a filtering or spray-type oil mist filter. However, it can effectively reduce the oil mist concentration and can reduce the average diameter of the droplets in the oil mist. These characteristics exactly meet the requirements of the present invention for reducing the deposition of oil stain droplets in the main air duct. Description of the Drawings

[0048] Figure 1 is a schematic diagram of the installation state of the oil mist filtration and emission system of the present invention in a production workshop;

[0049] Figure 2 It is a schematic top view of the oil mist filtration and emission system of the present invention;

[0050] Figure 3 is Figure 2 the front view of;

[0051] Figure 4 It is a schematic diagram of the working principle of the oil mist filtration and emission system and also Figure 2 the side view of;

[0052] Figure 5 is Figure 4 the enlarged view of part A in;

[0053] Figure 6 It is a schematic diagram of the connection structure at the joint of the main air duct section;

[0054] Figure 7 It is an exploded view of an oil mist interceptor of the present invention;

[0055] Figure 8 It is a three-dimensional view of the interception turntable part in the oil mist interceptor;

[0056] Figure 9 It is a sectional view of the internal structure of the oil mist interceptor.

[0057] Explanation of reference numerals

[0058] 1 - air duct, 1a - main air duct, 1a1 - duct section, 1a2 - flanging, 1a3 - L-shaped angle code, 1a4 - baffle, 1a5 - sealing material, 1b - branch air duct, 1b1 - rising part, 1b2 - expansion duct;

[0059] 2 - main fan;

[0060] 3 - oil mist purification system;

[0061] 4 - oil mist interceptor, 4a - housing, 4b - interception turntable, 4b1 - mounting shaft, 4b2 - interception spokes, 4b3 - outer ring frame, 4b4 - guide groove, 4b5 - guide hole;

[0062] 4c - drive motor, 4d - oil storage tank, 4e - oil drain port;

[0063] 5 - induced draft fan;

[0064] 6 - U-shaped liquid seal;

[0065] 7 - recovery container;

[0066] 8 - oil mist generating equipment. Detailed implementation manners

[0067] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0068] The object "oil mist" targeted by the present invention refers to a mixture of a large number of liquid pollutant particles and air. These liquid pollutants can be cutting oil, or undried paint, ink, etc. As mentioned in the background art, a large amount of oil mist will be generated during cutting processing, die stretching, and painting operations.

[0069] The present invention is not applicable to the treatment and discharge of dust and smoke generated by the mixture of solid pollutant particles and air.

[0070] It should be noted that the oil mist generating device 8 is not a part of the oil mist filtration and discharge system of the present invention, but the object served by the oil mist filtration and discharge system of the present invention. The oil mist generating device 8 can refer to any device in the workshop that generates oil mist and requires the discharge treatment of oil mist. For example, machine tools, spray booths, paint cabinets, inkjet printers, etc. When a machine tool is cutting, the cutting tool will break up and atomize the cutting fluid and mix it with air to form oil mist; the unattached paint in the spray booth and paint cabinet will disperse in the spray booth and paint cabinet to form oil mist. There are many devices that generate oil mist in machining, which will not be listed one by one herein.

[0071] The present invention provides an oil mist filtration and discharge system, including:

[0072] Air duct 1

[0073] The air duct 1 includes a main air duct 1a and a plurality of branch air ducts 1b. The air outlet of the main air duct 1a is connected to the main fan 2. The air outlet end of the branch air duct 1b is connected to the main air duct 1a. The air inlet end of the branch air duct 1b is connected to the oil mist generating device 8, and an oil mist interceptor 4 is provided on each branch air duct 1b. Different from the air duct of the air conditioning system, the air duct 1 in the present invention needs to transport oil mist, and during the transportation process, part of the oil mist will adhere to the inner wall of the air duct 1, which has a certain corrosiveness to the air duct 1. Therefore, the air duct 1 needs to be made of corrosion-resistant materials, or a corrosion-resistant coating is laid on the inner wall of the air duct 1.

[0074] Such as Figures 1-4As shown in the figure, the air duct 1 is divided into a main air duct 1a and branch air ducts 1b. A main fan 2 is provided at the air outlet of the main air duct 1a. The main fan 2 can generate negative pressure on the main air duct 1a to drive the air flow to flow from the branch air duct 1b to the main air duct 1a and then be discharged from the fan to the oil mist purification system 3. A plurality of branch air ducts 1b are connected to the main air duct 1a, and each branch air duct 1b is connected to an oil mist generating device 8. A valve is provided on each branch air duct 1b. On the one hand, the valve can prevent gas backflow. On the other hand, when the oil mist generating device 8 connected to the branch air duct 1b is not started, that is, no oil mist is generated, the valve can close the branch air duct 1b.

[0075] Main fan 2

[0076] The air outlet of the main fan 2 is connected to the oil mist purification system 3 to send the oil mist in the main air duct 1a into the oil mist purification system 3. The blades and the housing 4a of the main fan 2 also need to be made of corrosion-resistant materials, such as stainless steel.

[0077] Oil mist purification system 3

[0078] The oil mist purification system 3 is used to filter the oil mist and discharge it to the external environment. The oil mist purification system 3 can adopt a mechanical filtration type oil mist purifier, an electrostatic adsorption type oil mist purifier, a centrifugal oil mist separator, an activated carbon adsorption type oil mist purifier, a spray type oil mist purifier, etc.

[0079] The mechanical filtration type oil mist purifier is internally provided with multiple layers of filter meshes. Its advantage is good treatment effect, and its disadvantage is limited service life. If the pollutant concentration in the oil mist is high, the filter meshes need to be frequently cleaned or replaced.

[0080] The working principle of the electrostatic adsorption type oil mist purifier is to adsorb and settle the oil mist particles through a high-voltage electric field. Its advantages are high efficiency and the ability to handle fine oil mist particles. However, its disadvantages are that if the oil mist concentration is high, the settled oil mist will adhere to the electrode plates, resulting in a decrease in the treatment capacity and the need for frequent cleaning.

[0081] The centrifugal oil mist separator uses high-speed rotation to separate the liquid particles from the air in the oil mist. Its advantage is that it can recover the separated pollutant droplets, and its disadvantage is low treatment capacity and high energy consumption.

[0082] The spray type oil mist purifier uses the sprayed liquid droplets to capture the pollutants in the oil mist. Its advantages are low operating cost, no need for cleaning and maintenance, and large treatment capacity; its disadvantages are large equipment floor area, long construction period, and high construction cost.

[0083] Since an oil mist interceptor 4 is provided at the branch air duct 1b of the present invention, the pollutant concentration in the oil mist is significantly reduced, and the treatment load of the oil mist purification system 3 is reduced. Therefore, the oil mist purification system 3 in the present invention uses a mechanical filtration type oil mist purifier or an electrostatic adsorption type oil mist purifier. After being treated by the mechanical filtration type oil mist purifier or the electrostatic adsorption type oil mist purifier, the treated gas is then introduced into an activated carbon adsorption tower to remove the odor and other gaseous pollutants in the gas.

[0084] oil mist interceptor 4

[0085] The present invention specifically designs an oil mist interceptor 4. As Figures 7-9 shown, the oil mist interceptor 4 is installed on the branch air duct 1b to initially intercept the pollutants in the oil mist. And this oil mist interceptor 4 does not require cleaning or filter element replacement and other maintenance operations for a long time.

[0086] The oil mist interceptor 4 includes a housing 4a. The housing 4a is provided with an air inlet and an air outlet that are respectively connected to the branch air duct 1b, and an air flow channel is formed inside the housing 4a. An intercepting turntable 4b is rotatably installed inside the housing 4a. The driving motor 4c is connected to and drives the intercepting turntable 4b to rotate. The intercepting turntable 4b has a plurality of intercepting spokes 4b2 distributed radially. The oil mist entering the air flow channel inside the housing 4a from the air inlet passes through the rotating intercepting turntable 4b and flows out from the air outlet. A downwardly concave oil storage tank 4d is formed at the bottom of the inner wall of the housing 4a, and the oil storage tank 4d is provided with an oil drain port 4e for discharging the oil stain.

[0087] The working process of the oil mist interceptor 4 is as follows. As Figure 9 shown, the oil mist gas containing liquid pollutants enters the air flow channel inside the housing 4a from the air inlet, and then collides with the rotating intercepting turntable 4b. The intercepting spokes 4b2 on the intercepting turntable 4b collide with and capture most of the oil mist droplets. After the oil mist passes through the intercepting turntable 4b, the pollutant content is greatly reduced, and then it is discharged from the air outlet into the branch air duct 1b.

[0088] A motor bracket is provided inside the housing 4a. The driving motor 4c is fixed on the motor bracket, and the output shaft of the driving motor 4c is connected to the intercepting turntable 4b. The driving motor 4c is arranged on one side of the intercepting turntable 4b close to the air outlet of the housing 4a. After the oil mist passes through the intercepting turntable 4b, it then passes through the driving motor 4c, which can reduce the deposition of oil stain on the driving motor 4c.

[0089] intercepting turntable 4b

[0090] The structure of the intercepting turntable 4b is as Figure 8 shown. The intercepting turntable 4b includes a mounting shaft 4b1, intercepting spokes 4b2 and an outer ring frame 4b3. The inner ends of the intercepting spokes 4b2 are fixed on the mounting shaft 4b1, and the outer ends are connected to the outer ring frame 4b3.

[0091] The mounting shaft 4b1 is connected to the output shaft of the driving motor 4c. The outer ring frame 4b3 is annular, and a guiding groove 4b4 surrounding the outer ring frame 4b3 is formed on the inner edge of the outer ring. A number of guiding holes 4b5 are formed in the guiding groove 4b4, and the guiding holes 4b5 penetrate from the guiding groove 4b4 through the outer ring frame 4b3 to the outer edge of the outer ring frame 4b3. The outer end of the intercepting spoke 4b2 is fixed on the guiding groove 4b4 of the outer ring frame 4b3, and the intercepting spoke 4b2 is perpendicular to the air flow direction inside the housing 4a.

[0092] After the droplets in the oil mist collide with the intercepting spoke 4b2, they will adhere to the surface of the intercepting spoke 4b2, forming a flowing oil stain. Since the intercepting spoke 4b2 rotates around the mounting shaft 4b1, the flowing oil stain will flow outward along the intercepting spoke 4b2 to the guiding groove 4b4 based on the centrifugal force. After the oil stain accumulates in the guiding groove 4b4 to a certain extent, it is thrown out from the guiding hole 4b5 to the inner wall of the housing 4a, and flows along the inner wall of the housing 4a to the oil storage tank 4d under the action of gravity, and finally is discharged from the oil drain hole.

[0093] Oil stain recovery

[0094] As Figure 4 shown, a recovery container 7 is provided at the oil mist generating device 8. The outlet of the oil drain port 4e is connected to a U-shaped liquid seal 6. The outlet of the U-shaped liquid seal 6 is connected to a downward extending drain pipe. The bottom of the drain pipe communicates with the recovery container 7. Some oil mist generating devices 8 themselves have a liquid discharge or sewage discharge system. For example, some machine tools are equipped with a waste cutting fluid discharge system. Under the condition of not considering the recycling of cutting fluid, the oil stain collected by the oil mist interceptor 4 can also be directly discharged through the discharge system of the oil mist generating device 8. The recovery container 7 is a tank for containing oil stain, and a sensor for detecting the liquid level can be provided in the tank to give an alarm or feedback information.

[0095] The U-shaped liquid seal 6 is a device that uses the self-weight of the liquid to seal the gas passage, which can effectively prevent gas from overflowing. The liquid oil stain intercepted by the oil mist interceptor 4 enters the U-shaped liquid seal 6 from the oil drain port 4e. The liquid oil stain is first deposited in the middle of the U-shaped pipe, and the liquid oil stain will block the U-shaped pipe to prevent the gas in the oil mist interceptor 4 from overflowing from the U-shaped liquid seal 6. The U-shaped pipe will form a communicating vessel as long as the outlet of the U-shaped liquid seal 6 is lower than the inlet.

[0096] The specific setting requirements of the air duct 1 are as follows: The main air duct 1a is arranged at the top of the workshop where the oil mist generating device 8 is located. The branch air duct 1b includes an ascending part 1b1 that extends upward. The bottom of the ascending part 1b1 is connected to the oil mist generating device 8, and the oil mist in the ascending part 1b1 moves upward. The oil mist interceptor 4 is arranged in the ascending part 1b1 of the branch air duct 1b. Oil mist will not only deposit in the main air duct 1a, but also deposit in the branch air duct 1b. Vertically arranging the branch air duct 1b can effectively reduce the deposition of oil stains in the branch air duct 1b.

[0097] Independent induced draft fans 5 are arranged at the air inlets of the branch air ducts 1b. The air inlets of the induced draft fans 5 are connected to the oil mist generating device 8, and the outlets of the induced draft fans 5 are connected to the inlets of the branch air ducts 1b. A check valve is arranged on the branch air duct 1b to prevent air from flowing back.

[0098] An oil mist concentration sensor is arranged on the oil mist generating device 8. The oil mist concentration sensor is electrically connected to the induced draft fan 5 and controls the working power of the induced draft fan 5. The detection result of the oil mist concentration sensor is positively correlated with the power of the induced draft fan 5. The drive motor 4c in the oil mist interceptor 4 uses a constant-speed motor. When the oil mist generating device 8 is turned on, the oil mist interceptor 4 on the branch air duct 1b connected to the oil mist generating device 8 is started.

[0099] The induced draft fan 5 uses a speed-regulating motor, so the air flow rate of the induced draft fan 5 can be adjusted and controlled. When the oil mist concentration in the oil mist generating device 8 is low, the working power of the induced draft fan 5 connected to the oil mist generating device 8 is reduced. As the detection data of the oil mist concentration sensor on the oil mist generating device 8 increases, the power of the induced draft fan 5 is gradually increased.

[0100] The air outlet of the oil mist interceptor 4 is connected to an expansion pipe 1b2, and the diameter of the expansion pipe 1b2 gradually increases from the outlet of the oil mist interceptor 4. The diameter of the front branch air duct from the induced draft fan 5 to the oil mist interceptor 4 is smaller, and the diameter of the rear branch air duct from the oil mist interceptor 4 to the main air duct 1a is larger. The flow rate of the gas in the front branch air duct is greater than that in the rear branch air duct, so oil mist is not likely to deposit in the front branch air duct.

[0101] The rear branch air duct 1b is also vertically arranged. If oil mist deposits in the rear branch air duct 1b, the deposited oil stains will flow downward along the pipe of the rear branch air duct 1b into the oil mist interceptor 4, then downward along the inner wall of the housing 4a from the air outlet of the oil mist interceptor 4, and finally flow into the oil storage tank 4d.

[0102] The oil mist purification system 3 includes an oil mist purifier and an adsorber. The oil mist purification system 3 is arranged outdoors. The air inlet of the oil mist purifier is connected to the main fan 2 through a pipeline, the air outlet of the oil mist purifier is connected to the adsorber, and the air outlet of the adsorber is communicated with the atmosphere.

[0103] Connection design of the pipe section 1a1 of the main air duct 1a

[0104] The main air duct 1a is usually arranged on the roof of the building, and the main air duct 1a is arranged horizontally. The main air duct 1a is relatively long, so the main air duct 1a is composed of a plurality of pipe sections 1a1 connected end to end. Oil stains are likely to deposit at the joints of the pipe sections 1a1, and the joints of the pipe sections 1a1 are corroded, causing leakage and air leakage. Therefore, the present invention improves the connection method of the pipe sections 1a1.

[0105] As Figure 6 shown, both ends of the pipe section 1a1 are provided with flanges 1a2 extending outward perpendicular to the axis of the pipe section 1a1. A sealing material 1a5 is filled in the gap between the flanges 1a2 of adjacent pipe sections 1a1 to seal the gap. L-shaped angle codes 1a3 are respectively arranged on the outer sides of adjacent flanges 1a2. The vertical side of the L-shaped angle code 1a3 is in close contact with the flange 1a2, and the horizontal side is in close contact with the outer wall of the pipe section 1a1.

[0106] The two L-shaped angle codes 1a3 are connected by bolts and clamp the flange 1a2 between the L-shaped angle codes 1a3. One side of the L-shaped angle code 1a3 is in close contact with the flange 1a2, and the other side is in close contact with the outer wall of the pipe section 1a1. A baffle 1a4 is arranged at the joint of the pipe section 1a1. The baffle 1a4 is arranged in a ring around the joint of the pipe section 1a1. The baffle 1a4 is in close contact with the inner walls of the pipe sections 1a1 on both sides of the joint respectively. The baffle 1a4 is riveted and fixed to the horizontal side of the L-shaped angle code 1a3. The baffle 1a4 and the horizontal side of the L-shaped angle code 1a3 clamp the pipe wall in the middle.

[0107] On the one hand, the baffle 1a4 maintains the flatness of the inner wall of the air duct 1 and avoids forming a groove at the joint of the pipe section 1a1. On the other hand, the baffle 1a4 also improves the tightness of the joint of the pipe section 1a1. The gas needs to pass through the gap between the baffle 1a4 and the inner wall of the pipe section 1a1 directly before reaching the gap between the flanges 1a2 of the pipe section 1a1. And a sealing material 1a5 is arranged at the gap between the flanges 1a2 of the pipe section 1a1. The sealing material 1a5 can be made of rubber or directly bonded and fixed by structural adhesive.

[0108] The present invention also provides an oil mist interceptor 4. As Figures 7-9 shown in, the oil mist interceptor 4 includes a housing 4a, an intercepting turntable 4b and a driving motor 4c. The housing 4a is provided with an air inlet and an air outlet, and an air flow channel is formed in the housing 4a; the intercepting turntable 4b is rotatably arranged in the housing 4a.

[0109] A motor bracket is arranged in the housing 4a, and the driving motor 4c is fixed on the motor bracket. The output shaft of the driving motor 4c is connected to the intercepting turntable 4b. The driving motor 4c is arranged on one side of the intercepting turntable 4b close to the air outlet of the housing 4a.

[0110] The intercepting turntable 4b includes a mounting shaft 4b1, intercepting spokes 4b2, and an outer ring frame 4b3. The mounting shaft 4b1 is connected to the output shaft of the driving motor 4c. A plurality of intercepting spokes 4b2 are radially fixed on the mounting shaft 4b1. The outer ends of the intercepting spokes 4b2 are connected to the outer ring frame 4b3, and the intercepting spokes 4b2 are perpendicular to the air flow direction inside the housing 4a. The outer ring frame 4b3 is annular. A guiding groove 4b4 surrounding the outer ring frame 4b3 is formed on the inner edge of the outer ring. The guiding groove 4b4 includes a number of guiding holes 4b5 that penetrate from the guiding groove 4b4 through the outer ring frame 4b3 to the outer edge of the outer ring frame 4b3. The outer ends of the intercepting spokes 4b2 are fixed on the guiding groove 4b4 of the outer ring frame 4b3.

[0111] At the bottom of the inner wall of the housing 4a, an oil storage groove 4d that is recessed downward is formed. The oil storage groove 4d is provided with an oil drain port 4e for discharging oil stains.

[0112] Compared with the prior art, the oil mist filtration and emission system of the present invention has the following remarkable advantages and technical effects:

[0113] Limitations of the prior art

[0114] In the field of machining, the treatment methods for oil mist mainly include the following three types:

[0115] 1. Built-in oil mist collection system: Some high-end machine tools (such as CNC machine tools, turning centers, grinders, etc.) are equipped with built-in oil mist collectors, which directly extract the oil mist generated during the machining process through the exhaust port.

[0116] 2. External independent oil mist purifier: For machine tools without exhaust devices, factories usually install independent oil mist purifiers, which are connected to the inside of the machine tool protective cover or the machine shell through pipes to achieve the extraction and filtration of oil mist.

[0117] 3. Oil mist exhaust system: Directly connect the equipment that generates oil mist (such as machine tools, painting equipment) through the exhaust duct 1, and extract the oil mist from the production workshop for centralized treatment.

[0118] Although the above treatment methods solve the oil mist emission problem to a certain extent, they have the following limitations:

[0119] High cost and high transformation difficulty: The first two methods require updating equipment or modifying existing equipment. For large-scale processing factories, due to the large number of equipment, the comprehensive cost is high.

[0120] Maintenance problems of the air duct 1: Oil mist is easily deposited in the air duct 1, resulting in a reduction in the cross-sectional area of the air duct 1 and affecting gas flow. The turbulence caused by the attachment of oil stains will intensify the vibration of the air duct 1, and even corrode the joints of the air duct 1, destroying the airtightness, causing oil mist leakage and oil stain leakage.

[0121] Technical advantages of the present invention

[0122] Through innovative system design, the present invention effectively solves the problems existing in the prior art, and the specific advantages are as follows:

[0123] 1. Reduced oil stain deposition in the main air duct 1a

[0124] In the present invention, the main air duct 1a is connected to the oil mist generating device 8 through the branch air duct 1b. When the oil mist flows through the branch air duct 1b to the main air duct 1a, due to the relatively large diameter of the main air duct 1a, the flow rate of the oil mist significantly decreases, and the pollutant droplets in the oil mist are likely to settle in the main air duct 1a and adhere to the pipe wall. In the present invention, an oil mist interceptor 4 is provided on the branch air duct 1b. After the oil mist is intercepted by the oil mist interceptor 4, it is preliminarily purified, reducing the pollutant concentration of the oil mist entering the main air duct 1a, thereby reducing the accumulation of oil stains in the main air duct 1a.

[0125] 2. Preliminary purification effect of the oil mist interceptor 4

[0126] In the present invention, an oil mist interceptor 4 is provided on the branch air duct 1b for preliminary treatment of the oil mist:

[0127] Efficient interception: When the interception spokes 4b2 of the interception turntable 4b rotate at high speed, they collide with the oil mist droplets, and the droplets are thrown towards the housing 4a by centrifugal force. The oil droplets flow into the oil storage tank 4d under the action of gravity and are discharged.

[0128] Droplet fragmentation: Some droplets are broken into smaller droplets after hitting the interception spokes 4b2, further reducing oil mist deposition and the amount of oil stain deposition in the air duct.

[0129] 3. Reduced working load of the purification system

[0130] After preliminary treatment by the oil mist interceptor 4, the pollutant concentration in the oil mist is significantly reduced, greatly reducing the working load of the oil mist purification system 3. This enables the system to use equipment with lower processing capacity, thus reducing the equipment procurement cost and the installation floor area. At the same time, the replacement cycle of the filter element and activated carbon of the purification system is extended, further reducing the maintenance cost.

[0131] 4. Optimized droplet diameter distribution

[0132] Through the design of the interception spokes 4b2 in the present invention, the average diameter of the droplets in the oil mist is reduced, which is more conducive to the suspension of the droplets in the main air duct 1a, reducing the possibility of settlement, and thus reducing the oil stain deposition in the main air duct 1a.

[0133] 5. Maintenance-free design

[0134] The oil mist interceptor 4 of the present invention does not rely on components such as filter elements or filter meshes that need to be regularly cleaned or replaced, but realizes the physical interception of oil mist through the interception spokes 4b2, significantly reducing the maintenance frequency and cost of the equipment.

[0135] In summary, through the innovative design of the oil mist interceptor 4 and the system architecture, the present invention effectively solves the problems in the prior art such as the difficult maintenance of the air duct 1 and the high load of the purification system. It not only reduces the equipment procurement and operation costs, but also significantly improves the stability and environmental protection performance of the system, providing an efficient, economical and reliable oil mist treatment solution for the machining industry.

[0136] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. An oil mist filtration and exhaust system, characterized in that: include: An air duct (1) comprises a main air duct (1a) and a plurality of branch air ducts (1b); the air outlet of the main air duct (1a) is connected to a main fan (2); the air outlet end of the branch air duct (1b) is connected to the main air duct (1a); the air inlet end of the branch air duct (1b) is connected to an oil mist generating device (8); and each branch air duct (1b) is provided with an oil mist interceptor (4); A main fan (2), whose air outlet is connected to the oil mist purification system (3) and is used to pass the oil mist in the main air duct (1a) into the oil mist purification system (3); An oil mist purification system (3) is used to filter the oil mist and discharge it into the external environment; The oil mist interceptor (4) comprises a shell (4a), the shell (4a) is provided with an air inlet and an air outlet respectively connected to a branch air duct (1b), and an air flow channel is formed in the shell (4a); an interception turntable (4b) is rotatably installed in the shell (4a), and a driving motor (4c) is connected to and drives the interception turntable (4b) to rotate; the interception turntable (4b) is provided with a plurality of radially distributed interception spokes (4b2), and the oil mist entering the air flow channel from the air inlet passes through the rotating interception turntable (4b) and flows out from the air outlet; a downwardly concave oil storage tank (4d) is formed at the bottom of the inner wall of the shell (4a), and the oil storage tank (4d) is provided with an oil discharge port (4e).

2. The oil mist filtration exhaust system according to claim 1, characterized in that: A motor bracket is arranged inside the shell (4a), a driving motor (4c) is fixed on the motor bracket, and an output shaft of the driving motor (4c) is connected to the intercepting turntable (4b); the driving motor (4c) is arranged on a side of the intercepting turntable (4b) close to the air outlet of the shell (4a).

3. The oil mist filtration exhaust system according to claim 1, characterized in that: The interception turntable (4b) comprises a mounting shaft (4b1), interception spokes (4b2) and an outer ring frame (4b3), wherein the inner ends of the interception spokes (4b2) are fixed on the mounting shaft (4b1), and the outer ends are connected to the outer ring frame (4b3); The mounting shaft (4b1) is connected to the output shaft of the driving motor (4c); The outer ring frame (4b3) is annular, and a guide groove (4b4) surrounding the outer ring frame (4b3) is provided on the inner edge of the outer ring, and the guide groove (4b4) includes a plurality of guide holes (4b5) extending from the guide groove (4b4) through the outer ring frame (4b3) to the outer edge of the outer ring frame (4b3); The outer end of the intercepting spoke (4b2) is fixed on the guide groove (4b4) of the outer ring frame (4b3), and the intercepting spoke (4b2) is perpendicular to the flow direction of the airflow in the shell (4a).

4. The oil mist filtration exhaust system according to claim 1, characterized in that: A recovery container (7) is provided at the oil mist generating device (8); the outlet of the oil discharge port (4e) is connected to a U-shaped liquid seal (6); the outlet of the U-shaped liquid seal (6) is connected to an oil discharge pipe extending downward; and the bottom of the oil discharge pipe is connected to the recovery container (7).

5. The oil mist filtration exhaust system according to claim 1, characterized in that: The main air duct (1a) is arranged at the top of the workshop where the oil mist generating device (8) is located; the branch air duct (1b) includes a rising portion (1b1) extending upward, the bottom of the rising portion (1b1) is connected to the oil mist generating device (8), and the oil mist moves upward in the rising portion (1b1); The oil mist interceptor (4) is arranged at the rising portion (1b1) of the branch air duct (1b).

6. The oil mist filtration exhaust system according to claim 1, characterized in that: An independent induced draft fan (5) is provided at the air inlet of the branch air duct (1b); the air inlet of the induced draft fan (5) is connected to the oil mist generating device (8); the outlet of the induced draft fan (5) is connected to the inlet of the branch air duct (1b); and a check valve is provided on the branch air duct (1b) to prevent air backflow; An oil mist concentration sensor is provided on the oil mist generating device (8), the oil mist concentration sensor is electrically connected to the induced draft fan (5) and controls the working power of the induced draft fan (5); the detection result of the oil mist concentration sensor is positively correlated with the power of the induced draft fan (5).

7. The oil mist filtration exhaust system according to claim 6, characterized in that: The air outlet of the oil mist interceptor (4) is connected to the expansion pipe (1b2), and the diameter of the expansion pipe (1b2) gradually increases from the outlet of the oil mist interceptor (4).

8. The oil mist filtration exhaust system according to claim 1, characterized in that: The oil mist purification system (3) comprises an oil mist purifier and an adsorber, and the oil mist purification system (3) is arranged outdoors; The air inlet of the oil mist purifier is connected to the main fan (2) through a pipeline, the air outlet of the oil mist purifier is connected to the adsorber, and the air outlet of the adsorber is connected to the atmosphere; The oil mist purifier is a filtering oil mist purifier or an electrostatic adsorption oil mist purifier; the adsorber is an activated carbon adsorption tower.

9. The oil mist filtration exhaust system according to claim 1, characterized in that: The main air duct (1a) is arranged horizontally, and the main air duct (1a) is composed of a plurality of pipe sections (1a1) connected end to end; Both ends of the pipe section (1a1) are provided with folded edges (1a2) extending outward perpendicularly to the axis of the pipe section (1a1), and the gaps between the folded edges (1a2) of adjacent pipe sections (1a1) are filled with sealing material (1a5) to seal the gaps; L-shaped corner brackets (1a3) are respectively arranged on the outer sides of adjacent folded edges (1a2), the vertical sides of the L-shaped corner brackets (1a3) are closely attached to the folded edges (1a2), and the horizontal sides are closely attached to the outer wall of the pipe section (1a1); The two L-shaped corner brackets (1a3) are connected by bolts and the folded edge (1a2) between the L-shaped corner brackets (1a3) is clamped, and one side of the L-shaped corner bracket (1a3) is in close contact with the folded edge (1a2), and the other side is in close contact with the outer wall of the pipe section (1a1); A baffle (1a4) is arranged at the joint of the pipe section (1a1), the baffle (1a4) being arranged in an annular shape around the joint of the pipe section (1a1), and the baffle (1a4) is respectively in close contact with the inner wall of the pipe section (1a1) on both sides of the joint; The baffle plate (1a4) is fixed to the transverse side of the L-shaped angle code (1a3) by riveting, and the transverse sides of the baffle plate (1a4) and the L-shaped angle code (1a3) clamp the wall of the pipe section (1a1) in the middle.

10. An oil mist interceptor, characterized in that: It comprises a shell (4a), an interception turntable (4b) and a driving motor (4c); the shell (4a) is provided with an air inlet and an air outlet, and an air flow channel is formed in the shell (4a); the interception turntable (4b) is rotatably arranged in the shell (4a); A motor bracket is arranged in the shell (4a), a driving motor (4c) is fixed on the motor bracket, and an output shaft of the driving motor (4c) is connected to the intercepting turntable (4b); the driving motor (4c) is arranged on a side of the intercepting turntable (4b) close to the air outlet of the shell (4a); The interception turntable (4b) comprises a mounting shaft (4b1), interception spokes (4b2) and an outer ring frame (4b3); the mounting shaft (4b1) is connected to the output shaft of the driving motor (4c); a plurality of interception spokes (4b2) are radially fixed on the mounting shaft (4b1), the outer ends of the interception spokes (4b2) are connected to the outer ring frame (4b3), and the interception spokes (4b2) are perpendicular to the flow direction of the airflow in the shell (4a); the outer ring frame (4b3) is annular, and a guide groove (4b4) surrounding the outer ring frame (4b3) is provided on the inner edge of the outer ring, and the guide groove (4b4) comprises a plurality of guide holes (4b5) extending from the guide groove (4b4) through the outer ring frame (4b3) to the outer edge of the outer ring frame (4b3); the outer ends of the interception spokes (4b2) are fixed on the guide groove (4b4) of the outer ring frame (4b3); The bottom of the inner wall of the housing (4a) forms an oil storage groove (4d) which is recessed downwards, and the oil storage groove (4d) is provided with an oil discharge port (4e).

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