Oil fume purification device with emission temperature difference adjustment function, purification method and adjustment method

Abstract

The invention provides an oil fume purification device with an emission temperature difference adjusting function, a purification method and an adjusting method. The oil fume purification device comprises an oil fume purification unit, a connecting pipeline and a heat exchange unit. The oil fume purification unit can perform four-stage purification on oil fume and communicates with the heat exchange unit through a connecting pipeline, and the heat exchange unit can balance the temperature difference between the oil fume and the natural environment; the lampblack purification unit is used for purification; the heat exchange unit is used for adjusting the method. Through mutual cooperation of the cooking fume purification unit, the connecting pipeline and the heat exchange unit, the cooking fume purification unit can perform four-stage purification on cooking fume, and the heat exchange unit can balance the temperature difference between the cooking fume and the natural environment; due to the arrangement of the purification method, the oil fume can be subjected to four-stage purification, and the oil fume removal efficiency reaches 98%; through the setting of the adjusting method, the difference between the cooled exhaust gas temperature and the environment temperature is controlled within + / -10 DEG C, the exhaust gas temperature cannot be captured by external thermal imaging during field operation, and the concealment during use can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil fume purification, and in particular to an oil fume purification device capable of adjusting emission temperature difference, a purification method and an adjustment method. Background Art

[0002] Conventional kitchen fume emissions are generally discharged directly without treatment. Some are discharged after simple purification, which inevitably causes pollution and impact on the external environment. However, in cases where there are special requirements for exhaust temperature (such as field operations do not want to be captured by enemy thermal imaging, in order to increase concealment during use, it is necessary to control the exhaust fume temperature), such as requiring the temperature difference with the natural environment to be controlled within the range of ±10℃ (the natural environment temperature condition is -40℃~50℃), the conventional kitchen fume treatment method cannot meet the technical requirements for kitchen fume emission temperature, because the kitchen fume discharged indoors is generally around 40℃, and the temperature difference is large under extremely cold and extremely hot environmental conditions, especially the temperature difference is the largest under extremely cold environmental conditions, with a temperature difference of nearly 80℃.

[0003] For example, the comparative document with announcement number CN209840228U discloses a composite system for oil fume purification and fresh air treatment in the catering industry, which belongs to the field of oil fume purification and fresh air treatment in the catering industry. The system includes an oil fume purification system and a fresh air treatment system: the oil fume purification system includes a mechanical electrostatic composite unit connected to the oil fume inlet in sequence, a UV light deodorization unit and an activated carbon adsorption deodorization unit, an air-to-air heat exchanger, an exhaust fan and an oil fume outlet; the fresh air treatment system includes an air filter connected to the fresh air inlet in sequence, the air-to-air heat exchanger, a heat exchange coil, a blower and a fresh air supply port; the oil fume purification system in the composite system can only perform simple purification treatment on the oil fume, and the purification effect is general; the fresh air treatment system in the composite system is used to warm the fresh air and discharge it into the room, and cannot control the temperature difference between the oil fume emission and the natural environment. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to improve the effect of oil fume purification and control the temperature difference between oil fume emission and the natural environment.

[0005] The present invention solves the above technical problems through the following technical means:

[0006] A fume purification device capable of adjusting the emission temperature difference comprises an fume purification unit (1), a connecting pipe (2), and a heat exchange unit (3); the fume purification unit (1) is capable of performing four-stage purification on the fume; the fume purification unit (1) is connected to the heat exchange unit (3) via the connecting pipe (2); and the heat exchange unit (3) is capable of balancing the temperature difference between the fume and the natural environment.

[0007] Beneficial effects: Through the cooperation of the oil fume purification unit, the connecting pipe and the heat exchange unit, the oil fume purification unit can perform four-stage purification of the oil fume, and the heat exchange unit can balance the temperature difference between the oil fume and the natural environment.

[0008] Furthermore, the oil fume purification unit (1) comprises a main body (11), a control system (12), a mechanical cyclone separator (14), a liquid film generator (15), a differential oil fume separator (16), and a UV photolysis purification and deodorizing device (17). The main body (11) is provided with a control system (12). The main body (11) is provided with a mechanical cyclone separator (14), a liquid film generator (15), a differential oil fume separator (16), and a UV photolysis purification and deodorizing device (17) in sequence according to the flow sequence of the oil fume. The main body (11) is provided with a smoke outlet passage (113) near the mechanical cyclone separator (14). The main body (11) is provided with a smoke inlet passage (114) near the UV photolysis purification and deodorizing device (17). The control system (12) is electrically connected to the liquid film generator (15), the differential oil fume separator (16), and the UV photolysis purification and deodorizing device (17).

[0009] Beneficial effects: Through the coordination of the control system, mechanical cyclone separator, liquid film generator, differential oil fume separator, and UV photolysis purification and deodorization device; the control system can coordinate the mechanical cyclone separator, liquid film generator, differential oil fume separator, and UV photolysis purification and deodorization device according to the actual working conditions; the mechanical cyclone separator uses the centrifugal force generated to perform the first-level separation and purification of oil fume, which can intercept larger particle impurities and oil fume, realize oil fume separation, and filter oil particles with a particle size of 3 to 10 um; the liquid film generator is centered It can separate and absorb small particles of impurities and oil smoke, cool down the oil smoke, and filter grease particles with a particle size of 0.01um~10um; the differential oil smoke separator realizes oil and gas separation and purification, and filters grease particles and water particles with a particle size of more than 1um; the UV photolysis purification deodorizer can generate a large amount of ultraviolet light to irradiate the odorous gas, degrade and transform the odorous gas into low molecular compounds, such as harmless gases such as CO2 and H2O, to achieve the effect of effectively removing odors, and filter grease particles with a particle size of less than 3um.

[0010] Furthermore, the main body (11) comprises a first substrate (111) and a second substrate (112); the first substrate (111) is located above the second substrate (112) and the first substrate (111) and the second substrate (112) are connected to each other; a smoke outlet passage (113) is provided on the side wall of the first substrate (111); a smoke inlet passage (114) is provided on the bottom wall of the second substrate (112); an operating component (13) is fixed on the second substrate (112); the operating component (13) is electrically connected to the control system (12); a mechanical cyclone separator (14) and a liquid film generator (15) are arranged in sequence in the second substrate (112) according to the flow sequence of the oil smoke; and a differential oil smoke separator (16) and a UV photolysis purification and deodorizer (17) are arranged in sequence in the first substrate (111) according to the flow sequence of the oil smoke.

[0011] Beneficial effect: By setting the operating components, it is possible to cooperate with the control system to realize manual interaction.

[0012] Furthermore, a waterproof guide plate (115) is fixed inside the main body (11) between the smoke inlet passage (114) and the mechanical cyclone separator (14), and the output end of the waterproof guide plate (115) is connected to the circulating water tank (152) of the liquid film generator (15).

[0013] Beneficial effect: By setting the waterproof guide plate, the water mist of the liquid film generator can be blocked and recovered.

[0014] Furthermore, the mechanical cyclone separator (14) is provided as a rectangular plate, and a plurality of cyclone centrifugal wind slots (141) are provided through the rectangular plate. The output end of the mechanical cyclone separator (14) is connected to the circulating water tank (152) of the liquid film generator (15).

[0015] Beneficial effect: Through the setting of the swirl centrifugal wind slot, the centrifugal force can be generated, and the centrifugal force can perform the first-stage separation and purification of the oil fume, and can intercept larger particles of impurities and oil fume to achieve oil fume separation.

[0016] Furthermore, the liquid film generator (15) comprises a water pump (151), a circulating water tank (152), and a nozzle (153); the circulating water tank (152) is fixed to the input end of the water pump (151); a plurality of nozzles (153) are fixed to the output end of the water pump (151); the plurality of nozzles (153) form a uniformly distributed liquid film layer above the mechanical cyclone separator (14).

[0017] Beneficial effect: Through the cooperation of the water pump, circulating water tank and nozzle, a uniform liquid film layer can be formed above the mechanical cyclone separator for second-stage separation and purification. Fume removal purifier is added to the liquid film to separate and absorb small and medium-sized particle impurities and fume, and can cool the fume.

[0018] Furthermore, the heat exchange unit (3) comprises a shell (31), an oil fume inlet (32), a first exhaust fan (33), an oil fume exhaust port (34), an air inlet (35), a second exhaust fan (36), an air outlet (37), an air heat exchanger (38), and a control mechanism (39); an oil fume inlet (32) is provided on one side of the shell (31), an oil fume exhaust port (34) is provided on the other side of the shell (31), and the first exhaust fan (33) is fixed on one side of the shell (31) near the oil fume exhaust port (34). An air inlet (35) is provided at the bottom of the shell (31), an air outlet (37) is provided at the top of the shell (31), a plurality of second exhaust fans (36) are fixed along the X-axis on one side of the shell (31) close to the air outlet (37), and an air heat exchanger (38) is detachably provided in the shell (31); a control mechanism (39) is fixed in the shell (31), a first temperature sensor is fixed at the air inlet (35), a second temperature sensor is fixed at the oil fume exhaust port (34), and the control mechanism (39) is electrically connected to each sensor.

[0019] Beneficial effect: Through the setting of the control mechanism, the first temperature sensor and the second temperature sensor, the first temperature sensor is used to detect the ambient temperature, and the second temperature sensor is used to detect the temperature of the oil fume after cooling treatment. The control mechanism controls the speed of the second exhaust fan by comparing the outlet air temperature with the ambient temperature signal, thereby balancing the temperature difference between the oil fume and the natural environment.

[0020] Furthermore, a pressure sensor is fixed at the oil fume and smoke inlet (32).

[0021] Beneficial effect: The pressure sensor is set to detect the inlet wind pressure of the oil fume, and the control mechanism uses this inlet wind pressure to control the speed of the first exhaust fan, so that a certain negative pressure value is maintained at the oil fume inlet to ensure smooth discharge of oil fume in the oil fume exhaust port.

[0022] The present invention also discloses a purification method using the oil fume purification device with adjustable emission temperature difference described in any of the above technical solutions, comprising the following steps:

[0023] S1 turns on the control system (12), and the kitchen fumes are sucked into the first chamber through the external exhaust fan to generate negative pressure, and then pass through the mechanical cyclone separator (14) for primary purification;

[0024] S2 The oil smoke after the primary purification enters the second chamber and undergoes secondary purification through the water film generated by the liquid film generator (15);

[0025] S3 The oil smoke after the secondary purification enters the third chamber and undergoes the third purification through the differential oil smoke separator (16);

[0026] The oil smoke after the three-stage purification in S4 enters the fourth chamber and is purified by the UV photolysis purification and deodorization device (17) before being discharged.

[0027] Beneficial effect: Through the setting of the purification method, the oil fume can be purified in four stages. After the comprehensive four-stage purification, the oil fume removal efficiency reaches 98%.

[0028] The present invention also discloses a method for adjusting the oil fume purification device capable of adjusting the emission temperature difference using any of the above technical solutions, comprising the following steps:

[0029] S1 The oil smoke is sucked from the inner cavity of the air heat exchanger (38) by the first exhaust fan (33) and discharged outside, and the external air is sucked and discharged by the second exhaust fan (36) through the outer cavity of the air heat exchanger (38), completing the heat exchange between the oil smoke and the external air;

[0030] The first temperature sensor S2 is used to detect the ambient temperature, and the second temperature sensor is used to detect the temperature of the oil smoke after cooling. The control mechanism (39) controls the rotation speed of the second exhaust fan (36) by comparing the outlet air temperature with the ambient temperature signal, and finally controls the difference between the exhaust temperature after cooling and the ambient temperature to be within ±10°C.

[0031] Beneficial effect: By setting the adjustment method, the difference between the exhaust temperature after cooling and the ambient temperature can be controlled within ±10°C. It will not be captured by external thermal imaging during field operations, which can increase the concealment during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the assembly of a fume purification device capable of adjusting the emission temperature difference according to the first embodiment of the present invention;

[0033] Figure 2 It is a three-dimensional diagram of an oil fume purification unit in an oil fume purification device capable of adjusting the emission temperature difference according to a first embodiment of the present invention;

[0034] Figure 3 It is a front view of an oil fume purification unit in an oil fume purification device capable of adjusting the emission temperature difference according to a first embodiment of the present invention;

[0035] Figure 4 for Figure 3 BB cross-sectional view;

[0036] Figure 5 for Figure 3 The CC section view;

[0037] Figure 6 It is a three-dimensional diagram of a mechanical cyclone separator in a fume purification device capable of adjusting the emission temperature difference according to a first embodiment of the present invention;

[0038] Figure 7 It is a schematic diagram of a liquid film generator in a fume purification device capable of adjusting the emission temperature difference according to a first embodiment of the present invention;

[0039] Figure 8 It is a front cross-sectional view of a heat exchange unit in a fume purification device capable of adjusting the emission temperature difference according to a first embodiment of the present invention;

[0040] Fig. 9 It is a bottom view of a heat exchange unit in a fume purification device capable of adjusting the emission temperature difference according to a first embodiment of the present invention;

[0041] Fig.10 The top view of the heat exchange unit in the oil fume purification device with adjustable emission temperature difference is shown in Example 1 of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Embodiment 1

[0044] like Figure 1 As shown, this embodiment provides an oil fume purification device capable of adjusting the emission temperature difference, including an oil fume purification unit 1, a connecting pipe 2, a heat exchange unit 3, and a stove 4.

[0045] like Figure 1 As shown, an oil fume purification unit 1 is arranged above the stove 4, and the oil fume purification unit 1 is connected to the heat exchange unit 3 through a connecting pipe 2. The heat exchange unit 3 can balance the temperature difference between the oil fume and the natural environment.

[0046] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the oil fume purification unit 1 includes a main body 11, a control system 12, an operating component 13, a mechanical cyclone separator 14, a liquid film generator 15, a differential oil fume separator 16, and a UV photolysis purification deodorizer 17. The main body 11 includes a first substrate 111 and a second substrate 112. The first substrate 111 and the second substrate 112 are both hollow. The first substrate 111 is located above the second substrate 112 and the first substrate 111 and the second substrate 112 are connected. The control system 12 is fixed on the first substrate 111, and the operating component 13 is fixed on the second substrate 112. A smoke outlet passage 113 is opened on the side wall of the first substrate 111, and a smoke inlet passage 114 is opened on the bottom wall of the second substrate 112; the control system 12 is electrically connected to the operating component 13, and the control system 12 is electrically connected to the liquid film generator 15, the differential oil fume separator 16, and the UV photolysis purification deodorizer 17;

[0047] like Figure 2 , Figure 4 As shown, a waterproof guide plate 115 is fixed inside the second base body 112 between the smoke inlet passage 114 and the mechanical cyclone separator 14, and the output end of the waterproof guide plate 115 is connected to the circulating water tank 152 of the liquid film generator 15;

[0048] like Figure 2 , Figure 4 , Figure 6 As shown, the mechanical cyclone separator 14 is fixed in the second base body 112. The mechanical cyclone separator 14 is a rectangular plate. A plurality of cyclone centrifugal wind slots 141 are provided on the rectangular plate. The output end of the mechanical cyclone separator 14 is connected to the circulating water tank 152 of the liquid film generator 15. The generated centrifugal force is used to perform the first-stage separation and purification of the oil fume, and can intercept larger particle impurities and oil fume to achieve oil fume separation. The particle size of the filtered grease particles is 3 to 10 um, and the removal rate of larger particle oil fume reaches 90%;

[0049] like Figure 2 , Figure 4 , Figure 7 As shown, the liquid film generator 15 includes a water pump 151, a circulating water tank 152, and a nozzle 153. The liquid film generator 15 is fixed in the second substrate 112. The input end of the water pump 151 is fixed with a circulating water tank 152, and the output end of the water pump 151 is fixed with a plurality of nozzles 153. The plurality of nozzles 153 form a uniform liquid film layer above the mechanical cyclone separator 14 to perform the second stage of separation and purification. A fume removal purifier is added to the liquid film to separate and absorb small and medium-sized particle impurities and fume, and can cool the fume. The particle size of the filtered grease particles is 0.01um to 10um, the small and medium-sized oil particle removal rate is 90%, and the odor removal rate is 70%;

[0050] like Figure 4 , Figure 5As shown, the differential oil fume separator 16 is provided with a plurality of oil fume separators which are fixed in the first substrate 111 along the X-axis, and the first substrate 111 and the second substrate 112 are connected between the mechanical cyclone separator 14 and the differential oil fume separator 16; the differential oil fume separator 16 adopts a double-layer oil fume separation plate, an upper and a lower layer, a differential structure, and a motor drives the rotating oil fume separation plate at a speed of 1420 revolutions per minute. The differential oil fume separator 16 is a prior art, forming an airflow wall to intercept oil fume, and then the oil is thrown out by the centrifugal force generated by the high-speed rotation, and recovered by the mechanical cyclone separator 14; the high-speed rotating fan blades form a physical shield, which effectively intercepts oil vapor particles, water vapor particles, fiber, colloid, etc., and the gas can pass freely to perform the third-level separation and purification, thereby realizing oil and gas separation and purification, filtering oil particles and water particles with a particle size of more than 1um, and the oil and water particle removal rate reaches 93.7%;

[0051] like Figure 5 As shown, the UV photolysis purification and deodorizer 17 is fixed in the first substrate 111. The UV photolysis purification and deodorizer 17 is a prior art. The photolysis technology of the UV photolysis purification and deodorizer 17 is used as the fourth-level purification and deodorization. The flue gas separated by the first three levels of purification enters the UV photolysis purification and deodorizer 17 for the fourth-level purification. After the UV lamp 171 is started, it can generate a large amount of ultraviolet light to irradiate the odorous gas, degrade and transform the odorous gas into low molecular compounds, such as harmless gases such as CO2 and H2O, so as to achieve the effect of effectively removing odors, filter oil and fat particles with a particle size of less than 3um, and have a deodorization efficiency of more than 90%; after the comprehensive four-level purification, the oil fume removal efficiency reaches 98%.

[0052] like Figure 2 As shown, the heat exchange unit 3 includes a housing 31, a fume inlet 32, a first exhaust fan 33, a fume exhaust port 34, an air inlet 35, a second exhaust fan 36, an air outlet 37, an air heat exchanger 38, and a control mechanism 39;

[0053] like Figure 1 , Figure 8 As shown, the shell 31 is an integrated frame structure, and a fume inlet 32 ​​is provided on one side of the shell 31, and the fume inlet 32 ​​is connected to the connecting pipe 2, and is used to introduce the high-temperature kitchen exhaust smoke after fume purification into the heat exchange unit 3, and a fume exhaust port 34 is provided on the other side of the shell 31, and an air outlet louver is fixed to the fume exhaust port 34. A first exhaust fan 33 is fixed on one side of the shell 31 near the fume exhaust port 34, and the first exhaust fan 33 is used to provide power for kitchen fume extraction, and is an EC direct-connected fan with a built-in speed control driver. The fan working power supply is single-phase AC220V, the speed control signal is 0-10V, and the fan speed controller is built-in on the fan stator;

[0054] like Figure 8 , Fig. 9 , Fig.10 As shown, an air inlet 35 is provided at the bottom of the shell 31, and an air inlet louver and an air filter (not shown) are fixed on one side of the shell 31 near the air inlet 35 to prevent air dust from entering the air heat exchanger 38; an air outlet 37 is provided at the top of the shell 31, and an air outlet louver is fixed on the air outlet 37, and a plurality of second exhaust fans 36 are fixed along the X-axis on one side of the shell 31 near the air outlet 37, and the number of the second exhaust fans 36 is matched according to the cooling air volume, and the EC direct-connected fan with a built-in speed control driver, the fan working power supply is single-phase AC220V, the speed control signal is 0-10V, and the fan speed controller is built-in on the fan stator;

[0055] like Figure 8 , Fig. 9 As shown, an air heat exchanger 38 is detachably provided in the shell 31. In this embodiment, the air heat exchanger 38 is detachable from the air inlet 35. The material of the air heat exchanger 38 is SUS304 stainless steel, and the structure of the air heat exchanger 38 is the prior art; the detachable setting facilitates the cleaning and maintenance of the air heat exchanger 38 during use, and can ensure that the equipment obtains the best working performance for a long time. During use, the service life of the equipment can be extended by cleaning; the air heat exchanger 38 is used for heat exchange between oil smoke and external air. The oil smoke is sucked into the inner cavity of the air heat exchanger 38 by the first exhaust fan 33 and discharged to the outside, and the external air is sucked into and discharged by the second exhaust fan 36 through the outer cavity of the air heat exchanger 38.

[0056] like Figure 8 As shown, a control mechanism 39 is fixed in the housing 31, and the control mechanism 39 is electrically connected to each sensor;

[0057] like Figure 8 As shown, a pressure sensor (not shown) is fixed at the oil fume inlet 32 ​​for detecting the inlet wind pressure of the oil fume; the control mechanism 39 uses the inlet wind pressure to control the rotation speed of the first exhaust fan 33, so that a certain negative pressure value is maintained at the oil fume inlet 32 ​​to ensure smooth discharge of the oil fume in the oil fume exhaust port 34;

[0058] like Figure 8 As shown, a first temperature sensor (not shown) is fixed at the air inlet 35 for detecting the ambient temperature, and a second temperature sensor (not shown) is fixed at the oil fume exhaust port 34 for detecting the temperature of the oil fume after cooling. The control mechanism 39 controls the rotation speed of the second exhaust fan 36 by comparing the outlet air temperature with the ambient temperature signal.

[0059] When in use, the oil smoke in the cooker 4 is purified in four stages through the oil smoke purification unit 1. The overall oil smoke purification process of the oil smoke purification unit 1 is as follows: click the operating component 13 on the outside to transmit it to the control system 12. Through the control system 12, the kitchen oil smoke generates negative pressure through the external exhaust fan, and the oil smoke is first sucked into the first chamber ①, and then purified by the mechanical cyclone separator 14 and enters the second chamber ②, and then purified by the water film generated by the liquid film generator 15 in the second chamber ② and enters the third chamber ③, and then purified by the differential oil smoke separator 16 and enters the fourth chamber ④, and finally purified by the UV photolysis purification deodorizer 17 and discharged; the purified oil smoke enters the heat exchange unit 3 through the connecting pipe 2, and the oil smoke The air is sucked in from the inner cavity of the air heat exchanger 38 and discharged to the outside by the first exhaust fan 33, and the external air is sucked in and discharged by the second exhaust fan 36 through the outer cavity of the air heat exchanger 38, thereby completing the heat exchange between the oil smoke and the external air; the first temperature sensor is used to detect the ambient temperature, and the second temperature sensor is used to detect the temperature of the oil smoke after cooling treatment. The control mechanism 39 controls the rotation speed of the second exhaust fan 36 by comparing the air outlet temperature with the ambient temperature signal; if the temperature difference between the two is large, the control mechanism 39 gives an instruction to increase the rotation speed of the second exhaust fan 36, accelerate the heat exchange airflow, increase the heat exchange amount, and thus reduce the temperature difference between the two, and vice versa. Finally, the difference between the exhaust temperature after cooling and the ambient temperature is controlled to be within ±10°C.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fume purification device capable of adjusting the emission temperature difference, characterized in that: It comprises an oil fume purification unit (1), a connecting pipe (2), and a heat exchange unit (3); The oil fume purification unit (1) is capable of performing four-stage purification of oil fume; the oil fume purification unit (1) is connected to a heat exchange unit (3) via a connecting pipe (2); and the heat exchange unit (3) is capable of balancing the temperature difference between the oil fume and the natural environment.

2. The oil fume purification device capable of adjusting the emission temperature difference according to claim 1, characterized in that: The oil fume purification unit (1) comprises a main body (11), a control system (12), a mechanical cyclone separator (14), a liquid film generator (15), a differential oil fume separator (16), and a UV photolysis purification and deodorizing device (17). The main body (11) is provided with a control system (12). The main body (11) is provided with a mechanical cyclone separator (14), a liquid film generator (15), a differential oil fume separator (16), and a UV photolysis purification and deodorizing device (17) in sequence according to the flow sequence of the oil fume. A smoke outlet passage (113) is provided on the main body (11) near the mechanical cyclone separator (14). A smoke inlet passage (114) is provided on the main body (11) near the UV photolysis purification and deodorizing device (17). The control system (12) is electrically connected to the liquid film generator (15), the differential oil fume separator (16), and the UV photolysis purification and deodorizing device (17).

3. The oil fume purification device capable of adjusting the emission temperature difference according to claim 2, characterized in that: The main body (11) comprises a first base (111) and a second base (112); the first base (111) is located above the second base (112) and the first base (111) and the second base (112) are connected to each other; a smoke outlet passage (113) is provided on the side wall of the first base (111); a smoke inlet passage (114) is provided on the bottom wall of the second base (112); an operating component (13) is fixed on the second base (112); the operating component (13) is electrically connected to the control system (12); a mechanical cyclone separator (14) and a liquid film generator (15) are arranged in sequence in the second base (112) according to the flow sequence of the oil smoke; and a differential oil smoke separator (16) and a UV photolysis purification and deodorizer (17) are arranged in sequence in the first base (111) according to the flow sequence of the oil smoke.

4. The oil fume purification device capable of adjusting the emission temperature difference according to claim 2, characterized in that: A waterproof guide plate (115) is fixed inside the main body (11) between the smoke inlet passage (114) and the mechanical cyclone separator (14), and the output end of the waterproof guide plate (115) is connected to the circulating water tank (152) of the liquid film generator (15).

5. The oil fume purification device capable of adjusting the emission temperature difference according to claim 2, characterized in that: The mechanical cyclone separator (14) is provided in the form of a rectangular plate, and a plurality of cyclone centrifugal air slots (141) are provided through the rectangular plate. The output end of the mechanical cyclone separator (14) is connected to the circulating water tank (152) of the liquid film generator (15).

6. The oil fume purification device capable of adjusting the emission temperature difference according to claim 2, characterized in that: The liquid film generator (15) comprises a water pump (151), a circulating water tank (152), and a nozzle (153); the circulating water tank (152) is fixed to the input end of the water pump (151); a plurality of nozzles (153) are fixed to the output end of the water pump (151); the plurality of nozzles (153) form a uniformly distributed liquid film layer above the mechanical cyclone separator (14).

7. The oil fume purification device capable of adjusting the emission temperature difference according to claim 1, characterized in that: The heat exchange unit (3) comprises a shell (31), an oil fume inlet (32), a first exhaust fan (33), an oil fume exhaust port (34), an air inlet (35), a second exhaust fan (36), an air outlet (37), an air heat exchanger (38), and a control mechanism (39); an oil fume inlet (32) is provided on one side of the shell (31), an oil fume exhaust port (34) is provided on the other side of the shell (31); a first exhaust fan (33) is fixed on one side of the shell (31) close to the oil fume exhaust port (34); and a second exhaust fan (36) is provided on the other side of the shell (31). An air inlet (35) is provided at the bottom of the shell (31), an air outlet (37) is provided at the top of the shell (31), a plurality of second exhaust fans (36) are fixed along the X-axis on one side of the shell (31) close to the air outlet (37), and an air heat exchanger (38) is detachably provided in the shell (31); a control mechanism (39) is fixed in the shell (31), a first temperature sensor is fixed at the air inlet (35), a second temperature sensor is fixed at the oil fume exhaust port (34), and the control mechanism (39) is electrically connected to each sensor.

8. The oil fume purification device capable of adjusting the emission temperature difference according to claim 7, characterized in that: A pressure sensor is fixed at the oil fume and smoke inlet (32).

9. A purification method using the oil fume purification device capable of adjusting the emission temperature difference according to claim 2, characterized in that: The following steps are involved: S1 turns on the control system (12), and the kitchen fumes are sucked into the first chamber through the external exhaust fan to generate negative pressure, and then pass through the mechanical cyclone separator (14) for primary purification; S2 The oil smoke after the primary purification enters the second chamber and undergoes secondary purification through the water film generated by the liquid film generator (15); S3 The oil smoke after the secondary purification enters the third chamber and undergoes the third purification through the differential oil smoke separator (16); After the three-stage purification in S4, the oil smoke enters the fourth chamber and is purified by the UV photolysis purification and deodorization device (17) before being discharged.

10. A method for adjusting the oil fume purification device capable of adjusting the emission temperature difference according to claim 7, characterized in that: The following steps are involved: S1 The oil smoke is sucked from the inner cavity of the air heat exchanger (38) by the first exhaust fan (33) and discharged outside, and the external air is sucked and discharged by the second exhaust fan (36) through the outer cavity of the air heat exchanger (38), completing the heat exchange between the oil smoke and the external air; The first temperature sensor S2 is used to detect the ambient temperature, and the second temperature sensor is used to detect the temperature of the oil smoke after cooling. The control mechanism (39) controls the rotation speed of the second exhaust fan (36) by comparing the outlet air temperature with the ambient temperature signal, and finally controls the difference between the exhaust temperature after cooling and the ambient temperature to be within ±10°C.

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