Cyclone separator for oil fume separation and smoking apparatus

Abstract

A cyclone separator for oil fume separation, comprising a separator body provided with a dirt outlet and an inlet channel in a tangential direction, oil fume enters the separator body through the inlet channel to rotate and discharge separated oil drops through the dirt outlet, and further comprising an outlet channel extending in the tangential direction of the separator body, and an axial direction of the separator body forms an acute angle a with a vertical direction. The technical scheme provided by the present application has the following advantages compared with the prior art: less kinetic energy loss, more reasonable structure design, lower fan air extraction energy consumption, and better oil separation and collection effect.

Description

Technical Field

[0001] This invention relates to the field of oil fume purification, and more particularly to a cyclone separator and smoke extraction device for oil fume separation. Background Technology

[0002] Currently, cyclone separators are commonly used for oil fume purification. Oil fumes enter the cyclone separator tangentially and are induced to rotate, separating particulate matter under centrifugal force. With the increasing demand for diverse and flavorful cuisines and growing environmental awareness regarding wastewater treatment, kitchen oil fume purification equipment urgently needs to be equipped with cyclone separators that offer better grease separation, lower energy consumption, and a more rational structure. This is to compensate for the shortcomings of simply filtering grease with a screen or the incomplete purification effect caused by an improperly designed cyclone separator.

[0003] In the existing technology, although many manufacturers use cyclone separators in smoke extraction equipment such as range hoods or integrated stoves, almost all of them have many problems. For example, the Chinese utility model patent with authorization announcement number CN205174503U, entitled "Novel Self-Suction Swirl Combined Range Hood", discloses: including a fan (1), a venturi tube (2), a 45-degree flange elbow (3), an oil collection jacket (4), an oil drain nozzle (5), a DC guide vane swirler (6), a coalescing grid (7), an air collection structure (8), and an oil collection trough (9). The fan (1) and the venturi tube (2) are coaxially fixedly connected. The venturi tube (2) and the swirler (6) are connected through the 45-degree flange elbow (3). The swirler (6) and the oil collection jacket (4) are coaxially fixedly connected. The oil drain nozzle (5) and the oil collection jacket (4) are fixedly connected. The swirler (6) and the air collection structure (8) are threadedly connected. The coalescing grid (7) and the air collection structure (8) are fixedly connected. The oil collection trough (9) and the air collection structure (8) are tenon-jointed. In the technical solution described in this utility model, when the airflow enters the venturi tube inlet (2.4) through the flange elbow (3), it still has a large rotational kinetic energy. This part of the kinetic energy cannot be converted into pressure energy and can only be dissipated in the end, resulting in a large friction loss. In order to discharge the flue gas as much as possible, the energy consumption of the fan can only be increased, which is contrary to the concept of energy conservation and environmental protection.

[0004] For example, Chinese invention application CN104633736A, entitled "A Novel Oil Fume Emission Purification Device," discloses a device comprising a fan filter, a connecting tee, a transmission hose, an oil-removing cyclone, and an oil dripping cup. The oil-removing cyclone is connected to the transmission hose and the oil dripping cup. The transmission hose is connected to two ports of the connecting tee, and the fan filter is connected to the other port of the connecting tee. The port tangential to the oil-removing cyclone serves as the oil fume inlet, and the outlet of the fan filter is the oil fume exhaust outlet. In this invention application, because the oil dripping cup is in the opposite direction to the oil and gas exhaust, the oil fume entering the oil-removing cyclone through the inlet will create two opposing vortices, causing them to interfere with each other and generate flow resistance. This wastes some kinetic energy, ultimately resulting in a loss of airflow and air pressure, which is detrimental to reducing energy consumption during subsequent fan extraction.

[0005] For example, Chinese utility model patent CN202606304U, entitled "A Device for Electrostatic Treatment of Oily Fumes and Dust-Containing Gases with Cyclone and Hydrocyclone Flow," discloses a device comprising a centrifugal fan, a cyclone separator, and an electrostatic processor. The air inlet of the centrifugal fan and the air inlet of the cyclone separator are installed side-by-side on the same side. The fan's outlet pipe is connected tangentially to the cyclone separator, and the cyclone separator's outlet pipe is located at the top of the cyclone separator. The cyclone separator has an inner and outer cylinder structure; the lower part of the cyclone separator is the air inlet, the upper part is the negative pressure port, and the upper end of the outer cylinder is the air outlet, which is higher than the negative pressure port. The cyclone separator's outlet pipe is connected tangentially to the cyclone separator and aligns with the direction in which the centrifugal fan's outlet pipe tangentially enters the cyclone separator. Although the technical solution of this utility model sets the outlet pipe of the cyclone separator to be connected tangentially to the cyclone separator, the cyclone separator adopts an inner and outer cylinder structure and the outlet of the upper end of the outer cylinder is higher than the negative pressure port. Therefore, the oil fumes entering from the air inlet of the cyclone separator are actually forced into the cyclone separator by the rotation caused by the oil fumes in the centrifugal fan outlet pipe entering the cyclone separator tangentially, thus creating a negative pressure. Therefore, the oil fumes entering from the air inlet of the cyclone separator will first travel a straight distance before rotating under the influence of the rotating oil fumes. This will inevitably consume the rotational kinetic energy of the oil fumes entering the cyclone separator from the outlet pipe, thereby pulling... The fumes entering from the inlet of the cyclone separator are subject to two airflows with different trajectories, which inevitably increases flow resistance. By the time the airflow reaches the outlet at the top of the outer cylinder after passing through the negative pressure port, its rotational kinetic energy has been greatly lost. The reduced energy of the airflow affects the air volume and pressure, making it difficult for the fan to extract air. In addition, the attached diagram shows that the outlet pipe of the cyclone separator is bent, which also causes a significant resistance loss. Furthermore, the technical solution described in this utility model does not perform well in terms of oil droplet collection, especially when the fumes in the centrifugal fan outlet pipe enter tangentially, making it impossible to discharge the oil droplets generated by the rotation of these fumes. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a cyclone separator and smoking device with lower kinetic energy loss, more reasonable structural design, lower fan exhaust energy consumption, and better grease separation and collection effects.

[0007] The present invention adopts the following technical solution:

[0008] A cyclone separator for separating oil fumes includes a separator body, which has a drain outlet and an inlet channel along the tangential direction. Oil fumes enter the separator body through the inlet channel, rotate, and are discharged as separated oil droplets through the drain outlet. The separator body also includes an outlet channel that extends along the tangential direction of the separator body. The axial direction of the separator body forms an acute angle α with the vertical direction.

[0009] The separator body includes a main section and an extension section connected to each other. The inlet channel is connected to the main section, and the outlet channel is connected to the extension section. When the airflow cuts through the extension section and enters the outlet channel, it forms an angle θ with the axial direction of the extension section. The angle θ is related to the cross-sectional area S of the inlet channel. inlet and the cross-sectional area S of the extended segment extend The following relationship applies between them: Wherein, the value of k ranges from 0.38 to 0.41, and the included angle θ is an acute angle of not less than 20°.

[0010] The included angle θ is between 34° and 66°.

[0011] The inlet channel is connected to the top of the main section, and the sewage outlet is located at least at the lowest point of the main section.

[0012] The number of entrance channels is two, and the entrance channels are located opposite each other at the top of the main section.

[0013] The sewage outlet is located at the lowest point of the extension section.

[0014] In this configuration, the bottom edge of the main section bends inward to form an inner flange, and the top end of the extension section is inserted into a through hole formed by the inner flange and extends upward a certain distance; or, the bottom edge of the main section bends inward and upward to form an inner flange, and the top end of the extension section is inserted into a through hole formed by the inner flange, so that the connection structure between the main section and the extension section forms a groove with a U-shaped longitudinal section.

[0015] The outlet channel is connected to the extension section that protrudes over the entire length of the main section.

[0016] The bottom end of the extension section is closed.

[0017] The bottom end of the extension has a beveled surface, and the angle β between the beveled surface and the axial direction of the extension is equal to the angle θ.

[0018] The trajectory of the outlet channel connecting with the extension section is a straight line or a curve, and the cross-sectional area of ​​the outlet channel gradually increases in the direction away from the extension section.

[0019] The outlet channel extends outward in a straight line or extends outward in a curved manner.

[0020] The outlet channel adopts a right-angled trapezoidal structure with a curved top cross-section or a wedge-shaped structure with a curved top cross-section.

[0021] A smoking device employing the aforementioned cyclone separator for separating oil fumes.

[0022] This includes a flue gas passage that discharges smoke from top to bottom or bottom to top, and the flue gas passage is equipped with the cyclone separator for oil fume separation.

[0023] According to the technical solution described in this invention, the following beneficial effects are achieved: the outlet channel extends along the tangential direction of the separator body, and there is only a single-direction vortex in the separator body, avoiding path bends in the airflow entering the outlet channel after centrifugal rotation. The airflow can flow smoothly into the outlet channel, thereby retaining rotational kinetic energy as much as possible so that it can be converted into pressure energy and reduce the energy consumption of the fan. The axial direction of the separator body forms an acute angle α with the vertical direction, which facilitates the collection of separated oil droplets. Combined with the setting of the drain outlet, there will be no situation where some oil droplets cannot be collected or discharged. Moreover, the acute angle α between the axial direction of the separator body and the vertical direction can reduce the influence of gravity on the direction of the vortex, which is conducive to maintaining the original air volume and air pressure, providing conditions for converting rotational kinetic energy into pressure energy and reducing the energy consumption of the fan. When the airflow cuts out of the extension section and enters the outlet channel, it forms an angle θ with the axial direction of the extension section. By limiting the value of the angle θ, the cross-sectional area S of the inlet channel is further limited. inlet and the cross-sectional area S of the extension segment extendThe relationship between the main section and the extension section minimizes the loss of air volume and pressure, maximizes the retention of rotational kinetic energy, and converts almost all rotating airflow into airflow with a consistent flow direction, avoiding significant vortices in the outlet channel. The connection between the main section and the extension section allows the airflow to experience a "from thick to thin" pipe state in its travel, further enhancing the pressurization effect. The angle β between the bottom bevel of the extension section and the axial direction of the extension section is equal to the angle θ, so that the airflow will not impact the bevel and cause energy loss when it enters the outlet channel. The cross-sectional area of ​​the outlet channel gradually increases in the direction away from the extension section. This structural design can gradually convert the kinetic energy of the airflow into pressure energy. The accumulated airflow helps to reduce the energy consumption of the fan when it approaches the fan. The right-angled trapezoidal structure with a curved top bevel or the wedge structure with a curved top bevel serves as the outlet channel to intervene in the outflowing airflow, preventing the kinetic energy of the airflow from being wasted and converting it into pressure energy, thereby reducing the energy consumption of the fan when it is pumping air. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a cyclone separator in one embodiment.

[0025] Figure 2 This is a perspective view of the cyclone separator structure in another embodiment.

[0026] Figure 3 A schematic diagram showing the installation method of the cyclone separator in an integrated stove with the rear shell removed.

[0027] Figure 4 A list of optimal angle values ​​for the included angle θ after specifying the cross-sectional width of the entrance channel.

[0028] 1. Separator body, 10. Drain outlet, 100. Inlet channel, 11. Main section, 111. Inner flange, 12. Extension section, 120. Beveled surface, 2. Outlet channel. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0030] See Figure 1-3As shown, a cyclone separator for separating oil fumes includes a separator body 1, which has a drain port 10 and an inlet channel 100 along the tangential direction. Oil fumes enter the separator body 1 through the inlet channel 100, rotate, and are discharged as separated oil droplets through the drain port 10. It also includes an outlet channel 2, which extends along the tangential direction of the separator body 1. The axis of the separator body 1 forms an acute angle α with the vertical direction. In this application, the inclined arrangement where the axis of the separator body forms an acute angle α with the vertical direction allows the oil droplets to converge using gravity acting in the vertical direction, avoiding the situation where some oil droplets cannot converge. Moreover, this inclined structural design can better adapt to the "top-down" smoke passage in smoke extraction devices such as integrated stoves or "bottom-up" smoke extraction hoods (used for the cyclone separator's flip angle), reducing the influence of gravity on the direction of the vortex. Preferably, the separator body can adopt a cylindrical, conical, frustum-shaped, or combined cylindrical-conical curved surface structure to facilitate the centrifugal rotation of oil fumes within it, resulting in the ejection of oil droplets. Simultaneously, the curved surface structure also facilitates the oil droplets sliding along the inner wall and converging together. It should be noted that when using a conical, frustum-shaped, or combined cylindrical-conical structure, the inclination angle of the inner wall should not affect the convergence and aggregation of oil droplets. In this application, the outlet channel extends tangentially along the separator body. The separator body contains only a unidirectional vortex, preventing the airflow entering the outlet channel after centrifugal rotation from experiencing path bends. The airflow can flow smoothly into the outlet channel. Under a specific outlet channel configuration, the airflow can maintain a relatively consistent flow direction, thereby preserving rotational kinetic energy as much as possible, so that it can be converted into pressure energy and reduce the energy consumption of the fan during exhaust.

[0031] See Figure 1-3 As shown, the separator body 1 includes a main section 11 and an extension section 12 connected to each other. The inlet channel 100 is connected to the main section 11, and the outlet channel 2 is connected to the extension section 12. When the airflow cuts through the extension section 12 and enters the outlet channel 2, it forms an angle θ with the axial direction of the extension section 12. The angle θ is related to the cross-sectional area S of the inlet channel 100. inlet and the cross-sectional area S of extension segment 12 extend The following relationship applies between them: Wherein, k ranges from 0.38 to 0.41, and the included angle θ is an acute angle of not less than 20°. Preferably, k is 0.4. This design can effectively ensure that the loss of air volume and air pressure is minimized, without causing excessive flow resistance or insufficient air pressure entering the outlet channel due to excessive air flow difference between the two; it can also effectively ensure that the rotational kinetic energy of the airflow is retained to the maximum extent, and that almost all of the rotating airflow is converted into airflow with the same direction, avoiding obvious vortices in the outlet channel, thus providing the preconditions for converting more rotational kinetic energy into pressure energy. Preferably, the main section 11 and the extension section 12 are respectively adopted as one of the following structures: cylindrical, conical, or frustum-shaped. More preferably, in order to avoid the inner wall tilt angle affecting the convergence and aggregation of oil droplets, the main section 11 and the extension section 12 are respectively adopted as cylindrical structures.

[0032] See Figure 1-3 As shown, the included angle θ ranges from 34° to 66°. In this application, the tangential velocity and axial velocity of the airflow within the extension section are closely related to the magnitude of the included angle θ (i.e., corresponding to the cross-sectional area S of the inlet channel). inlet and the cross-sectional area S of the extension segment extend To maintain the original airflow and pressure as much as possible, reduce frictional resistance, and minimize rotational kinetic energy loss so that more of it is converted into pressure energy accumulated in the outlet channel, preferably, the included angle θ is between 34° and 66°, and more preferably, the included angle θ is 46°. Figure 4 When the cross-sectional width of the inlet channel 100 is given to be 25 mm, the optimal angle θ between the airflow cutting out of the extension section 12 and entering the outlet channel 12 and the axial direction of the extension section 12 is determined as the cross-sectional length of the inlet channel 100 and the radius of the cylindrical extension section 12 change continuously.

[0033] See Figure 1-3 As shown, the inlet channel 100 is connected to the top of the main section 11, and the sewage outlet 10 is located at least at the lowest point of the main section 11.

[0034] See Figure 1-3 As shown, there are two inlet channels 100, which are arranged opposite to each other at the top of the main section 11. Preferably, in order to draw in fumes over a wider range, the inlet channels 100 can be made to have a funnel-shaped opening at the end away from the separator body.

[0035] Furthermore, the drain outlet 10 is located at the lowest point of the extension section 12. This structural design can be used independently of the scheme where the drain outlet is located at the lowest point of the main section, or it can be used as a supplement to the scheme where the drain outlet is located at the lowest point of the main section. This structural design allows the oil droplets separated by centrifugal rotation in the extension section to be collected together and discharged.

[0036] See Figure 1-3 As shown, the bottom edge of the main section 11 bends inward to form an inward flange 111, and the top end of the extension section 12 is inserted into the through hole formed by the inward flange 111 and extends upward a certain distance; or, the bottom edge of the main section 11 bends inward and upward to form an inward flange 111, and the top end of the extension section 12 is inserted into the through hole formed by the inward flange 111, so that the connection structure between the main section 11 and the extension section 12 forms a U-shaped groove in longitudinal section. Preferably, the drain outlet 10 is located at the lowest point of the U-shaped groove. Although this application does not exclude embodiments in which the main section is inserted into the inward flange of the extension section (i.e., "the pipe that gets thicker from thinner"), from the perspective of being more conducive to collecting a larger amount of oil droplets (generally, newly entering fumes will separate a larger amount of oil droplets in the first half of the structure such as the main section) and further pressurizing the airflow through the pipe change, the above scheme is more structurally reasonable and has a better separation effect. It needs to be emphasized again that the airflow can be further pressurized after passing through the "thinning pipe", thereby increasing the rotation speed to prevent the loss of rotational kinetic energy, so as to better convert kinetic energy into pressure energy and reduce the energy consumption of the fan.

[0037] See Figure 1-3 As shown, the outlet channel 2 connects to the extension section 12, which protrudes over the entire length of the main section 11. This structural design prevents the outlet channel from being too far from the moving vortex, thus avoiding excessive airflow rotation and energy loss. Preferably, the sidewall of the outlet channel near the main section can be a curved surface with an inclination angle to the axis of the extension section to form a pointed structure. This minimizes the discharge of the airflow that just enters the rotating extension section, allowing more oil droplets to separate and improving the purification effect. It also facilitates the connection and processing between the outlet channel and the extension section.

[0038] See Figure 2 As shown, the bottom of the extension section 12 is closed. This structural design allows the airflow to fully enter the outlet channel, preventing leakage and loss of air volume.

[0039] See Figure 2 As shown, the bottom end of the extension section 12 has a beveled surface 120, and the angle β between the beveled surface 120 and the axial direction of the extension section 12 is equal to the angle θ. In this application, the airflow will not impact the beveled surface due to angle issues before entering the outlet channel, thus avoiding energy loss and playing a very positive role in maintaining the original airflow and air pressure. In this application, the closed state of the bottom end of the extension section does not contradict the existence of the beveled surface. For example, the bottom end of the extension section can be completely sealed by the beveled surface, or it can be partially blocked by the beveled surface. For example, when the sewage outlet is located at the lowest point of the extension section, a gap can be formed at the lowest point of the side wall of the extension section. In this case, the beveled surface does not need to be blocked, and a matching gap can be formed.

[0040] See Figure 1-3 As shown, the trajectory where the outlet channel 2 connects to the extension section 12 is a straight line or a curve, and the cross-sectional area of ​​the outlet channel 2 gradually increases in the direction away from the extension section 12. This type of outlet channel with "expansion" characteristics is beneficial in two ways: firstly, it helps to reduce pressure drop and flow resistance loss; secondly, it can minimize the loss of kinetic energy and directly convert kinetic energy into pressure energy. Preferably, the trajectory where the outlet channel 2 connects to the extension section 12 is a straight line, which makes it easier to make the airflow direction more consistent and prevents unexpected turbulence from causing loss of kinetic energy of the airflow.

[0041] See Figure 1-3 As shown, the outlet channel 2 extends outward in a straight line or in a curved manner. This application includes at least the following cases: a. When the trajectory connecting the outlet channel and the extension section is straight, for example, when the extension section is cylindrical, the trajectory can be a straight line parallel to the axis of the extension section. In this case, the outlet channel can extend outward in a straight line. b. When the trajectory connecting the outlet channel and the extension section is straight, for example, when the extension section is conical or frustum-shaped, the trajectory can be a straight line at a certain angle to the axis of the extension section, such as at the location of the generatrix of the conical or frustum-shaped section. In this case, the outlet channel can extend outward in a straight line. c. When the trajectory connecting the outlet channel and the extension section is curved, the projection of the trajectory is inclined to the axis of the extension section. For example, when the extension section is cylindrical, conical, or frustum-shaped, the trajectory connecting the outlet channel and the extension section can spirally wrap around the axis of the extension section, for example, the outlet channel will have at least a partial lateral wavy shape and extend outward in a curved manner. Preferably, the extension direction of the outlet channel 2 can have a specific angle with the vertical direction or a gradually changing angle with the vertical direction, or it can coincide with the vertical direction.

[0042] See Figure 1-3As shown, the outlet channel 2 adopts a right-angled trapezoidal structure with a curved top cross-section or a wedge-shaped structure with a curved top cross-section. In this application, if the airflow flowing out of the extension section is not interfered with, the rotational kinetic energy of the airflow itself will gradually dissipate, thereby reducing the overall energy of the airflow, ultimately affecting the air volume and air pressure, making it difficult for the fan to extract air, and increasing energy consumption. However, by adding the above-mentioned outlet channel, the kinetic energy of the airflow can be maintained as much as possible, and the direction of the airflow can be regulated and sorted, thereby converting it into pressure energy as much as possible, which facilitates the fan's extraction. Preferably, the outlet channel 2 adopts a right-angled trapezoidal structure with a curved top cross-section. More preferably, the side wall at the right angle of the right-angled trapezoidal structure is flush with the inclined surface 120. Therefore, when the airflow cuts out of the extension section and enters the outlet channel, it will not collide with the side wall at that end of the outlet channel, avoiding the vibration of the side wall and generating noise, and also preventing turbulence from affecting the accumulation of air pressure in the outlet channel.

[0043] See Figure 3 As shown, a smoking device employs the aforementioned cyclone separator for separating oil fumes.

[0044] See Figure 3 As shown, it includes a flue gas passage that discharges smoke from top to bottom or bottom to top, and a cyclone separator for oil fume separation is installed inside the flue gas passage.

[0045] Although specific embodiments of the present invention have been described above, those skilled in the art can make modifications to them without departing from the spirit and principles of the present invention. The scope of protection of the present invention is defined by its claims and their equivalents.

Claims

1. A cyclone separator for separating oil fumes, comprising a separator body, the separator body having a drain outlet and an inlet channel along a tangential direction, wherein oil fumes enter the separator body through the inlet channel, rotate, and are discharged as separated oil droplets through the drain outlet, characterized in that: It also includes an outlet channel that extends tangentially to the separator body, forming an acute angle α between the axial direction of the separator body and the vertical direction. The separator body comprises a main section and an extension section connected to each other. The inlet channel is connected to the main section, and the outlet channel is connected to the extension section. When the airflow cuts through the extension section and enters the outlet channel, it forms an angle θ with the axial direction of the extension section. The angle θ is related to the cross-sectional area S of the inlet channel. inlet and the cross-sectional area S of the extended segment extend The following relationship holds between them: cotθ=k* Wherein, k ranges from 0.38 to 0.41, and the included angle θ is an acute angle not less than 20°; the inlet channel connects to the top of the main section, and the sewage outlet is located at the lowest point of the main section; there are two inlet channels, which are located opposite each other at the top of the main section; the bottom edge of the main section bends inward to form an inner flange, and the top end of the extension is inserted into the through hole formed by the inner flange and extends upward for a certain distance; or, the bottom edge of the main section bends inward and upward to form an inner flange, and the top end of the extension is inserted into the through hole formed by the inner flange, so that the connection structure between the main section and the extension is formed as a groove with a U-shaped longitudinal section; the trajectory of the outlet channel connecting to the extension is a straight line or a curve, and the cross-sectional area of ​​the outlet channel gradually increases in the direction away from the extension.

2. The cyclone separator for oil fume separation according to claim 1, characterized in that: The included angle θ is between 34° and 66°.

3. The cyclone separator for oil fume separation according to claim 1, characterized in that: The exit channel is connected to the extension section that protrudes over the entire length of the main section.

4. The cyclone separator for oil fume separation according to claim 1, characterized in that: The bottom end of the extension is closed.

5. The cyclone separator for oil fume separation according to claim 1, characterized in that: The bottom end of the extension has a beveled surface, and the angle β between the beveled surface and the axial direction of the extension is equal to the angle θ.

6. The cyclone separator for oil fume separation according to claim 1, characterized in that: The outlet channel extends outward in a straight line or in a curved manner.

7. The cyclone separator for oil fume separation according to claim 6, characterized in that: The exit channel adopts a right-angled trapezoidal structure with a curved top cross-section or a wedge-shaped structure with a curved top cross-section.

8. A smoking device, characterized in that: The cyclone separator for oil fume separation described in any one of claims 1 to 7 is used.

9. The smoking device according to claim 8, characterized in that: It includes a flue gas passage that discharges smoke from top to bottom or bottom to top, and the flue gas passage is equipped with the cyclone separator for oil fume separation.

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