A range hood and a control method thereof

Abstract

The application discloses a range hood and a control method thereof. The range hood comprises a first box body and a second box body arranged above the first box body. An air inlet is formed in the front side of the first box body. A fan frame in fluid communication with the first box body is arranged in the second box body. A fan is arranged in the fan frame. The range hood further comprises a refrigeration device arranged outside the first box body and the fan frame. The refrigeration device comprises a compressor, a condenser and an evaporator. The range hood further comprises a third box body arranged in front of the first box body. The condenser comprises fins and a main heat dissipation coil pipe arranged in the third box body. The range hood further comprises a cleaning spray assembly which selectively sprays into the first box body or the fins.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to a range hood and a control method for the range hood. Background Technology

[0002] The kitchen is the primary place for cooking, and the quality of its air quality directly impacts the cooking experience. Kitchens are hot in summer and cold in winter, requiring both heating and cooling. To provide cool air in summer and warm air in winter, various air-conditioning range hoods were invented, integrating air conditioning components with the range hood itself, with air conditioning vents on the hood's casing. These air-conditioning range hoods can operate in multiple modes; when the air conditioning mode is activated, the vents will blow cool or warm air, either directly towards the cook or into the rest of the kitchen, effectively improving the cooking experience.

[0003] Currently, there are usually two ways to dissipate heat from the condenser in a refrigeration system. One way is to use an independent fan to dissipate heat from the condenser. This method is divided into two types: one is to use a common flue. This exhaust heat dissipation requires a large pressure to be discharged into the common flue, which requires a large independent fan, resulting in high cost and heavy weight of the whole unit; the other is to drill holes separately for exhaust heat dissipation, which will cause installation inconvenience, and users do not want holes to be drilled in the walls of the room.

[0004] Another type utilizes the range hood's fan to dissipate heat from the condenser. For example, Chinese patent application number 201920460790.X discloses a refrigerated range hood, comprising: a range hood system, a refrigeration system, and a housing. The housing forms a cavity, and the range hood system and refrigeration system are installed within the cavity. The refrigeration system has a cold air passage and an exhaust passage, while the range hood system has an exhaust passage. The refrigeration system is connected to an air outlet device, and the cold air passage is connected to the air outlet device. In this type of refrigerated range hood, the condenser is located in the fume passage, and the airflow from the fumes dissipates heat from the condenser. Over time, the condenser easily becomes dirty, reducing its heat dissipation efficiency.

[0005] The condensate from a refrigeration unit is usually used to dissipate heat from the condenser and then drained. In humid summers, the amount of condensate is relatively large, and if it cannot be drained in time, it will cause the unit to shut down.

[0006] In addition, existing range hoods usually have filters installed at the air inlet. Although this can extend the time before the fan system is polluted, it requires manual cleaning. If the cleaning is not timely, the filter will become clogged, affecting the smoke extraction effect and causing smoke to escape. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that uses the range hood's own fan to dissipate heat from the cooling device, eliminating the need for an additional fan, and also achieving cooling and cleaning of the condenser and the inner cavity of the range hood.

[0008] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned range hood, in order to address the shortcomings of the prior art.

[0009] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a range hood, including a first housing and a second housing disposed on the first housing, the first housing having an air inlet on the front side, and the second housing having a fan frame fluidly communicating with the first housing, and a fan disposed in the fan frame;

[0010] The range hood also includes a refrigeration unit located outside the first housing and fan frame, the refrigeration unit comprising a compressor, a condenser, and an evaporator; characterized in that:

[0011] The range hood also includes a third housing located before the first housing, and the condenser includes fins and a main heat dissipation coil located within the third housing;

[0012] The range hood also includes a cleaning spray assembly that selectively sprays water into the first housing or onto the fins.

[0013] The range hood's own fan dissipates heat from the condenser of the cooling unit, eliminating the need for an additional cooling fan. Furthermore, the fumes do not flow through the condenser, preventing contamination and reducing cooling efficiency. The cleaning spray component not only cools but also cleans the condenser, purifying the fumes and cleaning the interior of the range hood. This improves the cooling efficiency of the unit and reduces air resistance within the range hood.

[0014] Furthermore, the cleaning spray assembly includes a water spraying element and a spraying element that can rotate relative to each other. The water spraying element is connected to a water source and has a first nozzle. The spraying element has a second nozzle, which is slit-shaped. The water spraying element and the spraying element can cooperate in at least the following modes:

[0015] Water jet mode: The first nozzle and the second nozzle are misaligned, and water is sprayed directly from the first nozzle;

[0016] Water mist mode: The first nozzle and the second nozzle overlap, and water is sprayed through the first nozzle and the second nozzle in sequence.

[0017] Therefore, in water jet mode, the spray volume is larger, which can effectively clean the water, while in water mist mode, the spray volume and flow rate are smaller, which can effectively cool the water.

[0018] Furthermore, the cleaning spray assembly also includes a frame, a conduit, and a rotating shaft. The frame has an opening, and a notch is provided on the rear side wall of the third housing to accommodate the frame. The frame can rotate relative to the third housing and remains closed on the notch during rotation. The water spray element is mounted on the conduit and is in fluid communication with the conduit. The conduit is fixed to the frame, and the first nozzle faces the opening of the frame.

[0019] The spraying component is mounted on a rotating shaft, which is rotatably connected to the frame.

[0020] This allows the spray direction to be changed, and the cleaning spray assembly to be in a smoke-free chamber when not in operation, thus avoiding nozzle clogging.

[0021] Furthermore, the cleaning spray assembly also includes a water inlet pipe connected to a water source. The conduit is connected to the water inlet pipe, and the water inlet pipe passes through one end of the frame. The end of the frame is provided with a water pipe storage groove, in which part of the water inlet pipe is stored, thereby preventing the water inlet pipe from getting tangled.

[0022] Furthermore, a water box assembly for receiving condensate from the condenser is provided below the condenser in the third chamber. The water box assembly includes a water box and a water pump. The water pump is connected to the water spray component, thereby making full use of the condensate and avoiding the need to stop the machine for drainage when the amount of condensate exceeds the processing capacity of the whole machine.

[0023] Furthermore, a baffle plate is also provided in the third chamber below the condenser. The baffle plate is located above the water box assembly and gradually slopes downward from front to back, thereby guiding condensate into the water box.

[0024] Furthermore, a filter screen is provided inside the first housing, and the condenser also includes an auxiliary heat dissipation coil. The auxiliary heat dissipation coil is positioned above and below the filter screen. One end of the auxiliary heat dissipation coil is connected to the main heat dissipation coil of the condenser, and the other end is connected to the compressor. Thus, the filter screen can also exchange heat using the temperature rise of the condenser, making the filter screen easy to clean.

[0025] Furthermore, a filter screen is installed inside the first housing, and the condenser also includes an auxiliary heat dissipation coil, which is positioned above and below the filter screen. One end of the auxiliary heat dissipation coil is connected to the main heat dissipation coil of the condenser, and the other end is connected to the compressor. The cleaning spray assembly is positioned between the filter screen and the fins of the condenser and can spray water towards the filter screen. Thus, the condenser can utilize the process of the range hood exhausting oil fumes for auxiliary heat dissipation, and the filter screen can also utilize the temperature rise of the condenser for heat exchange, making the filter screen easy to clean. Moreover, the filter screen can be cleaned using condensate water, without the need for an additional heating module.

[0026] Preferably, the compressor and evaporator are placed in the second housing, the front of the second housing has a cold air outlet for blowing out the cold air after heat exchange with the evaporator, and the top of the second housing has an air inlet for evaporator makeup air.

[0027] To facilitate the use of evaporator condensate to cool the condenser, a downwardly recessed condensate collection trough is formed at the lower edge of the cold air outlet inside the second chamber. A liquid distributor is provided below the evaporator to spray the condensate collected from the evaporator onto the fins of the condenser. The condensate collection trough and the liquid distributor are connected by a water pipe.

[0028] Furthermore, to ensure uniform liquid distribution, the liquid distributor includes a housing and an orifice plate disposed within the housing. The orifice plate is inclined upwards from the left and right sides towards the center. The water pipe corresponds to the highest point of the orifice plate, and a drainage hole is provided at the bottom of the housing.

[0029] Furthermore, the bottom of the fan frame extends to the bottom of the second housing, and the bottom of the fan frame is adapted to the top of the first housing, thereby preventing oil fumes from leaking into the space outside the fan frame inside the second housing and contaminating the refrigeration unit.

[0030] Furthermore, to facilitate the rapid guidance of oil fumes into the fan, the fan frame includes an upper part and a lower part, with the lower part of the fan frame gradually tilting from the left and right sides towards the middle from bottom to top.

[0031] Furthermore, the refrigeration device also includes a flow distribution plate disposed below the fins of the condenser, and the third housing includes an air inlet and a valve that allows communication between the interior of the third housing and the fan frame when the condenser dissipates heat.

[0032] The flow distribution plate is positioned corresponding to the air intake. The flow distribution plate has through holes, with the smallest through holes on the left and right sides and the largest through hole in the middle. Since the air intake passes through the flow distribution plate from both sides, and the flow area is larger in the middle and smaller on the sides, the cold air is evenly distributed on the condenser, improving the condenser's heat dissipation efficiency and thus enhancing the cooling efficiency of the refrigeration unit.

[0033] Furthermore, the flow distribution plate is located below the cleaning spray assembly, so that the water spray component and the spray component of the cleaning spray assembly can rotate to spray onto the flow distribution plate, thereby also allowing the cleaning spray assembly to cool the flow distribution component.

[0034] The first technical solution adopted by the present invention to solve the second technical problem mentioned above is: a heat dissipation control method for a range hood as described above, characterized by comprising the following steps:

[0035] 1) Turn on the range hood and check if the cooling device is cooling. If it is, proceed to step 2).

[0036] 2) Collect the current temperature T of the condenser, and then determine the operating condition of the refrigeration unit at this time:

[0037] 2.1) If T < T0, where T0 is the preset normal operating temperature of the condenser, the refrigeration device continues to operate under the existing conditions, and then the heat dissipation control program ends.

[0038] 2.2) If T0 < T ≤ T1, where T1 is the preset condenser heat dissipation threshold, then determine whether cooking is in progress. If yes, proceed to step 2.2.1); otherwise, proceed to step 2.2.2).

[0039] 2.2.1) Determine whether the oil fume concentration has reached the preset threshold CF. If yes, start the cleaning spray assembly to spray water mist onto the upper part of the filter screen, and then return to step 2); if no, proceed to step 2.2.2).

[0040] 2.2.2) Start the cleaning spray assembly to spray water mist onto the condenser to cool it down, and then repeat step 2);

[0041] 2.3) If T > T1, it indicates that the refrigeration unit is under overheat protection. Start the cleaning spray assembly to spray water mist onto the condenser fins to cool them down. Then determine if it is still under overheat protection. If yes, start the cleaning spray assembly to complete one spray cooling of the condensers in the first and third chambers. Then repeat step 2). If no, repeat step 2).

[0042] The second technical solution adopted by the present invention to solve the second technical problem mentioned above is: a filter cleaning control method for a range hood as described above, characterized in that: a water box assembly for receiving condensate from the condenser is provided in the third box, the water box assembly includes a water box and a water pump, and the water pump is connected to the water spray component;

[0043] The filter cleaning control method includes the following steps:

[0044] 1) Begin by determining the degree of filter contamination and taking appropriate action based on the detected level of contamination:

[0045] 1.1) If the air volume Q < Q0, Q is the air volume loss through the filter (13), Q0 is the first preset air volume value, and the cleaning control program ends;

[0046] 1.2) If Q0 < Q ≤ Q1, Q1 is the second preset air volume value. Whether to clean the filter screen depends on whether the cooling unit is in operation during the season. 1.3) If Q > Q1, the filter screen is cleaned by spraying water jets after the water temperature in the water box reaches the preset cleaning temperature Tx.

[0047] Preferably, in step 1.2), if it is the season for turning on the refrigeration unit, proceed to step 1.2.1); otherwise, proceed to step 1.2.2); 1.2.1) Detect the water temperature in the water box and compare it with the ambient temperature. If it is the same as the ambient temperature, wait for the next time the refrigeration unit is turned on before judging the temperature again. If it is higher than the ambient temperature, proceed to step 1.2.2); 1.2.2) Start the cleaning spray assembly to spray water jets onto the filter screen for cleaning, and the cleaning control program ends.

[0048] Preferably, in step 1.3), it is determined whether it is the season for turning on the refrigeration unit. If yes, proceed to step 1.3.1); if no, proceed to step 1.3.2.

[0049] 1.3.1) Check if the water temperature in the water tank has reached the preset cleaning temperature Tx. If yes, start the cleaning spray assembly to spray water jets onto the filter screen to clean it, and the cleaning control program ends. If no, wait for the cooling device to start again before judging the temperature.

[0050] 1.3.2) Check if the water temperature in the water tank has reached the preset cleaning temperature Tx. If yes, start the cleaning spray assembly to spray water onto the filter screen and end the cleaning control program. If no, start the cooling device to heat the filter screen using the heat from the condenser. When the temperature of the condenser is higher than the preset heating temperature Ty, start the cleaning spray assembly to spray water onto the condenser and increase the temperature of the condensate collected in the water tank until the water temperature in the water tank reaches the preset cleaning temperature Tx. Then, start the cleaning spray assembly to spray water onto the filter screen.

[0051] Compared with existing technologies, the advantages of this invention are as follows: The range hood's own fan dissipates heat from the condenser of the cooling device, eliminating the need for an additional cooling fan. Furthermore, the fumes do not flow through the condenser, preventing contamination and reducing cooling efficiency. The cleaning spray component not only cools but also cleans, purifying both the condenser and fumes, thus cleaning the range hood's interior, improving cooling efficiency, and reducing air resistance. The condenser utilizes the fume extraction process for auxiliary heat dissipation, and the filter uses the condenser's temperature rise for heat exchange, making it easy to clean. The filter can be cleaned using condensate water, eliminating the need for an additional heating module, resulting in higher condensate water utilization. This not only purifies fumes but also cools the condenser and cleans both the filter and condenser. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present invention;

[0053] Figure 2 for Figure 1 A schematic diagram showing the concealed front walls of the second and third housings of the range hood;

[0054] Figure 3 for Figure 1 A schematic diagram showing the concealed front wall of the second housing, evaporator, and water pipes of a range hood;

[0055] Figure 4 This is a cross-sectional view of a range hood according to an embodiment of the present invention;

[0056] Figure 5 for Figure 4 A magnified schematic diagram of part I;

[0057] Figure 6 This is a schematic diagram of the water box assembly of a range hood according to an embodiment of the present invention;

[0058] Figure 7 This is a schematic diagram of the liquid distributor of a range hood according to an embodiment of the present invention;

[0059] Figure 8 This is a schematic diagram of the cleaning spray assembly of a range hood according to an embodiment of the present invention;

[0060] Figure 9 for Figure 8 A magnified schematic diagram of part II;

[0061] Figure 10 for Figure 8 A magnified schematic diagram of part III;

[0062] Figure 11 This is a schematic diagram of the water spray baffle and its rotating shaft of the cleaning spray assembly of the range hood according to an embodiment of the present invention;

[0063] Figure 12 This is a partial schematic diagram of the cleaning filter mode of the range hood according to an embodiment of the present invention;

[0064] Figure 13 for Figure 12 A magnified schematic diagram of part IV;

[0065] Figure 14 This is a partial schematic diagram of the fume purification mode of the range hood according to an embodiment of the present invention;

[0066] Figure 15 for Figure 14 A magnified view of part of V;

[0067] Figure 16 This is a partial schematic diagram of the cleaning condenser fin pattern of a range hood according to an embodiment of the present invention;

[0068] Figure 17 for Figure 16 A magnified schematic diagram of part VI;

[0069] Figure 18 This is a partial schematic diagram of the condenser cooling mode of the range hood according to an embodiment of the present invention;

[0070] Figure 19 for Figure 18 A magnified view of part of VII;

[0071] Figure 20 This is a partial schematic diagram of the cleaning flow distribution plate mode of the range hood according to an embodiment of the present invention;

[0072] Figure 21 for Figure 20 A magnified view of part of VIII;

[0073] Figure 22 This is a control flowchart of the heat dissipation method for a range hood according to an embodiment of the present invention;

[0074] Figure 23 This is a control flowchart for cleaning the filter screen of a range hood according to an embodiment of the present invention. Detailed Implementation

[0075] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0077] See Figures 1 to 11 A range hood includes a first housing 1, a second housing 2 disposed on top of the first housing 1, and a third housing 3 disposed on the front side of the first housing 1. The three housings can be an integral structure or separate structures.

[0078] The first housing 1 has an air inlet 11 on its front side for drawing in cooking fumes. A baffle 12 is installed at the air inlet 11, which can be flipped open and closed. A fan frame 21 is installed inside the second housing 2, and a fan 22 is installed inside the fan frame 21. The bottom of the fan frame 21 extends to the bottom of the second housing 2 and is in fluid communication with the inside of the first housing 1. The top of the fan frame 21 extends to the top of the second housing 2. The bottom of the fan frame 21 is adapted to the top of the first housing 1, so that cooking fumes from the first housing 1 can only enter the fan frame 21. The fan frame 21 includes an upper part 211 and a lower part 212. The upper part 211 can be rectangular, while the lower part 212 can be gradually inclined from bottom to top from the left and right sides towards the middle, thereby guiding the airflow of cooking fumes from the first housing 1 quickly into the upper part 211.

[0079] The range hood also includes a refrigeration unit, comprising a compressor 41, a condenser assembly 42, and an evaporator 43. The compressor 41, condenser assembly 42, and evaporator 43 form a refrigerant circulation path for refrigeration, using the same refrigeration method as existing technology. The compressor 41 and evaporator 43 can be housed within the second housing 2, both located outside the fan frame 21. A cold air outlet 23 is provided on the front side of the second housing 2, with the evaporator 43 corresponding to this outlet. An air inlet 24 can be provided on the top front side of the second housing 2 to supply air to the evaporator 43 for heat exchange.

[0080] The condenser assembly 42 includes a condenser 421, a mounting bracket 422, and a flow distribution plate 423. The condenser 421 is mounted inside the third housing 3 via the mounting bracket 422. The condenser 421 includes fins 4211, a main heat dissipation coil 4212, and an auxiliary heat dissipation coil 4213. The main heat dissipation coil 4212 is used to dissipate heat from the fins 4211. The fins 4211 and the main heat dissipation coil 4212 are located inside the third housing 3 and are isolated from oil fumes. The flow distribution plate 423 is located below the fins 4211 of the condenser 421. The flow distribution plate 423 has through holes 4231, with the through holes 4231 on the left and right sides having the smallest area and the through hole 4231 in the middle having the largest area. Air intake ports 34 can be formed on the left and right sides of the third housing 3, so that air can be supplied into the third housing 3 by the fan 22 to cool the condenser 421. A valve 35 can be installed on the top of the third housing 3 so that the third housing 3 can be opened during heat dissipation to make it fluidly connected with the fan frame 21.

[0081] The position of the flow distribution plate 423 corresponds to the air intake vent 31. When the flow distribution plate 423 is horizontal, the air intake vent 34 is located below the flow distribution plate 423, and the incoming air needs to pass through the flow distribution plate 423 to reach the condenser 421. The valve 32 is located above the condenser 421 and can be rotatably opened and closed, thereby allowing fluid communication or disconnection between the third housing 3 and the fan frame 21. When the condenser 421 needs heat dissipation, once the fan 22 starts, a negative pressure zone will be formed at the lower end of the fan 22, and the external atmospheric pressure will push the valve 32 open, realizing heat dissipation of the condenser 421. When the fan 22 stops, the valve 32 is closed under the action of gravity to prevent backflow of oil fumes. During the heat dissipation process, the flow distribution plate 423 is in a horizontal state. Since the airflow enters from the left and right, without the flow distribution plate 523, the make-up air would blow over the fins 4211 of the condenser 421 from the closest left and right positions, and the airflow in the middle position would be very small. Therefore, by making the flow distribution plate 423 have a large flow area in the middle and a small flow area on the left and right, the cold air will be evenly distributed on the condenser 421, improving the heat dissipation efficiency of the condenser 421, and thus improving the cooling efficiency of the refrigeration device.

[0082] Inside the second housing 2, a downwardly recessed condensate collection tank 25 is formed along the lower edge of the cold air outlet 23. A liquid distributor 44 is located below the evaporator 43 and above the condenser 421. The liquid distributor 44 and the condensate collection tank 25 are connected by a water pipe 26 to achieve fluid communication. The liquid distributor 44 includes a housing 441 and an orifice plate 442 disposed within the housing 441. The orifice plate 442 is inclined upwards from the left and right sides towards the middle. The water pipe 26 corresponds to the highest point of the orifice plate 442. A drain hole 443 is provided at the bottom of the housing 441. Thus, the condensate entering the housing 441 from the water pipe 26 can be relatively evenly distributed through the orifice plate 442, flowing to the bottom of the housing 441, and then flowing through the drain hole 443 to the fins 4211 of the condenser 421, cooling the fins 4211 and improving the refrigeration efficiency of the refrigeration unit.

[0083] Inside the third housing 3, below the condenser 421, there is a baffle plate 31 and a water box assembly 32. The baffle plate 31 gradually slopes downwards from front to back. The water box assembly 32 includes a water box 321, a water temperature sensor 322, and a water pump 323. The water temperature sensor 322 is located inside the water box 321. Condensate near the rear flows directly into the water box 321, while external condensate first flows onto the baffle plate 31 and then is guided backwards into the water box 321. The water box 321 is at least partially located behind the baffle plate 31, and the baffle plate 31 and the water box 321 are staggered, which facilitates airflow for heat dissipation from the condenser 421.

[0084] A filter screen 13 is installed inside the first housing 1, located below the fan frame 21. The auxiliary heat dissipation coil 4213 of the aforementioned condenser 421 is positioned above and below the filter screen 13. Multiple sets of wind speed sensors (not shown) can be arranged above and below the filter screen 13 to detect the clogging status of the filter screen 13. One end of the auxiliary heat dissipation coil 4213 of the condenser 421 is connected to the main heat dissipation coil 4212 of the condenser 421, and the other end is connected to the compressor 41, i.e., connected in series between the compressor 41 and the main heat dissipation coil 4212 of the condenser. The function of the auxiliary heat dissipation coil 4213 is, on the one hand, to dissipate heat from the fins 4211 when the range hood is exhausting smoke during operation of the refrigeration device; on the other hand, due to the cooling of the refrigeration device, the condenser 421 will reach a high temperature, and the high temperature of the auxiliary heat dissipation coil 4213 will radiate heat to the filter screen 13, increasing the fluidity of grease and extending the cleaning and maintenance cycle of the filter screen 13.

[0085] A cleaning spray assembly 5 is also provided between the condenser 421 and the filter screen 13, and it is also located above the flow distribution plate 423 of the condenser assembly 42. The cleaning spray assembly 5 includes a water spray element 51, a spray element 52, a frame 53, a first drive mechanism 54, and a second drive mechanism 55. The frame 53 may be semi-cylindrical and has an opening 531. A notch 33 may be provided on the rear side wall of the third housing 3 to accommodate the frame 53. The frame 53 can rotate relative to the third housing 3 and remains closed on the notch 33 on the third housing 3 during rotation. There are at least two water spray elements 51, arranged at intervals from left to right. Each water spray element 51 is mounted on a conduit 56 and is in fluid communication with the conduit 56. The left and right ends of the conduit 56 are respectively connected to the frame 53. The cleaning spray assembly 5 also includes a water inlet pipe 57. The conduit 56 and the water inlet pipe 57 may be an integral structure. The water inlet pipe 57 passes through one end of the frame 53, and a water pipe receiving groove 532 may be provided at this end of the frame 53. The water inlet pipe 57 is a flexible hose connected to the water pump 323. When the frame 53 rotates, part of the water inlet pipe 57 is contained within the water pipe receiving groove 532, preventing interference during rotation. Each water spray element 51 can be an arched or semi-circular shape protruding away from the conduit 56. A first nozzle 511 is provided on the side away from the conduit 56. At least three first nozzles 511 are arranged at left-right intervals. The middle first nozzle 511 is perpendicular to the opening of the water spray element 51, while the left first nozzle 511 is tilted to the left and the right first nozzle 511 is tilted to the right, thereby achieving a wide range of cleaning. The portion of the first nozzle 511 faces the opening of the frame 53.

[0086] The spray element 52 is disposed within the frame 53 and may be arc-shaped, with the arc curvature direction consistent with the frame 53. There are at least two spray elements 52 arranged at intervals on the left and right sides, one end of which is fixed to the rotating shaft 58. The two ends of the rotating shaft 58 are respectively connected to the two ends of the frame 53. A second nozzle 521 is provided at the end of the spray element 52 away from the rotating shaft 58. The second nozzle 521 is slit-shaped.

[0087] The first drive mechanism 54 drives the frame 53 to rotate, while the second drive mechanism 55 drives the rotating shaft 58 to rotate. The rotation axes of both the guide tube 56 and the rotating shaft 58 extend in the left-right direction, allowing the cleaning spray assembly 5 to switch between water mist and water jet modes, as well as the spray target. When water mist is needed, the second drive mechanism 55 drives the rotating shaft 58 to rotate. When the second nozzle 521 on the spray element 52 coincides with the first nozzle 511 of the water spray element 51, water mist is sprayed. The spray element 52 can be made of elastic rubber material, which can seal the contact process between the two parts. (See [reference]). Figure 14 and Figure 15When a water jet is needed, the second drive mechanism 55 drives the rotating shaft 58 to rotate. When the second nozzle 521 on the spraying component 52 is misaligned with the first nozzle 511 of the water spraying component 51, a water jet will be sprayed directly from the first nozzle 511.

[0088] See Figure 12 and Figure 13 When the filter 13 needs cleaning, the first drive mechanism 54 drives the frame 53 to rotate so that its opening 531 faces the rear of the filter 13, and causes the spray element 52 to rotate into water jet mode. This state can also clean the inside of the first housing 1; see also Figure 14 and Figure 15 When it is necessary to purify oil fumes, the opening 531 of the first drive mechanism 54 drives the frame 53 toward the rear filter 13, and causes the spray element 52 to rotate into water mist mode; see also Figure 16 and Figure 17 When the fins 4211 of the condenser 421 need to be cleaned, the opening 531 of the first drive mechanism 54 drives the frame 53 to face forward, causing the first nozzle 511 to face upward, and causing the spray element 52 to rotate into water column mode; see also Figure 18 and Figure 19 When cooling of the fins 4211 of the condenser 421 is required, the opening 531 of the first drive mechanism 54 drives the frame 53 to face forward, causing the first nozzle 511 to face upward, and causing the spray element 52 to rotate into water mist mode; see also Figure 20 and Figure 21 When the flow distribution plate 423 needs to be cleaned, the opening 531 of the first drive mechanism 54 drives the frame 53 to face downward, causing the first nozzle 511 to face downward, and causing the spray element 52 to rotate to the water column mode.

[0089] When the cleaning spray assembly 5 is not in operation, the opening 531 of the frame 53 faces forward and away from the filter screen 13 to prevent oil fumes from clogging the first nozzle 511 and the second nozzle 521. The water source for the cleaning spray assembly 5 comes from the condensate discharged from the evaporator 43, and no additional water is required.

[0090] See Figure 21 The condenser heat dissipation control method for the range hood of the present invention includes the following steps:

[0091] 1) Turn on the range hood and check if the cooling device is cooling. If it is, proceed to step 2).

[0092] 2) The current temperature T of the condenser 421 is collected by the temperature sensor built into the condenser 421, and then the operating condition of the refrigeration unit at this time is determined:

[0093] 2.1) If T < T0, T0 is the preset normal operating temperature of condenser 421. At this time, the refrigeration unit is refrigerating at normal efficiency. No intervention is needed to dissipate heat. It will continue to operate under the existing conditions and then the program will end.

[0094] 2.2) If T0 < T ≤ T1, where T1 is the preset heat dissipation threshold of condenser 421, the refrigeration device is inefficient. At this time, it will determine again whether cooking is in progress. If yes, proceed to step 2.2.1); otherwise, proceed to step 2.2.2).

[0095] 2.2.1) Determine whether the oil fume concentration has reached the preset threshold CF. If yes, start the cleaning spray assembly 5 to spray water mist onto the upper part of the filter screen 13 to accelerate the settling of oil fumes. The auxiliary heat dissipation coil 4213 under the filter screen 13 can also cool the fins 4211 of the condenser 421. This can improve the purification effect and the cooling efficiency of the refrigeration device. Then return to step 2); if no, proceed to step 2.2.2).

[0096] 2.2.2) Start the cleaning spray assembly 5 to cool down the condenser 421, and then repeat step 2);

[0097] 2.3) If T > T1, the refrigeration device is in overheat protection and stops cooling. Then, the cleaning spray assembly 5 is activated, and the first drive mechanism 54 drives the frame 53 to rotate, cooling the condenser 421 and completing one condenser 421 spray heat dissipation. Then, it is determined whether it is still in overheat protection. If so, the cleaning spray assembly 5 is activated, causing the frame 53 to rotate one revolution. When its opening 531 faces backward, it dissipates heat to the auxiliary heat dissipation coil 4213 below the filter 13 on the rear side. When its opening 531 rotates to face forward, it dissipates heat to the fins 4211 of the condenser 421 on the front side. Then, step 2) is repeated. If not, step 2) is repeated.

[0098] The preset thresholds T0, T1, and CF mentioned above are data obtained from previous experimental tests. Optionally, T0 is 20–25°C, T1 is 45–50°C, and the CF value is 15–20 mg / m³. 3 .

[0099] See Figure 22 The filter cleaning control method for a range hood of the present invention includes the following steps:

[0100] 1) First, determine the degree of contamination of filter 13. The degree of contamination of filter 13 can be determined by using a wind speed sensor to detect the rate of change of wind speed loss at the upper and lower positions of the filter. The air volume loss Q (wind speed multiplied by cross-sectional area) is calculated based on the wind speed loss, thereby determining the contamination status of the filter, and taking corresponding actions based on the detected degree of contamination:

[0101] 1.1) If the air volume Q < Q0, it is assumed that the filter 13 is not clogged or has no effect on the fume extraction effect. In this case, no action is required, and the process ends.

[0102] 1.2) If Q0 < Q ≤ Q1, it can be judged as a mild blockage. Then, it is determined whether it is the season for turning on the cooling device. This is mainly determined by the month and time set in the range hood system and by detecting the ambient temperature. If it is summer, it is judged as the season for turning on the cooling device, and then proceed to step 1.2.1). If not, proceed to step 1.2.2).

[0103] 1.2.1) Check the water temperature in water box 321 against the ambient temperature. If it is the same as the ambient temperature, wait for the next time the cooling device is turned on before checking the temperature again. If it is higher than the ambient temperature, proceed to step 1.2.2).

[0104] 1.2.2) Start the cleaning spray assembly 5 to clean the filter screen 13. This is done to make full use of the condensate flowing through the condenser 421 for heat exchange, increase the water temperature and enhance the cleaning effect of the filter screen 13. End.

[0105] 1.3) If Q > Q1, it can be judged as a severe blockage. Then, determine whether it is the season for turning on the refrigeration unit. The judgment method is the same as step 1.2). If yes, proceed to step 1.3.1); if no, proceed to step 1.3.2.

[0106] 1.3.1) Check if the water temperature in water box 321 has reached Tx. If so, start the cleaning spray assembly 5 to clean the filter screen 13 and then stop. If not, wait for the next time the cooling device is turned on before judging the temperature.

[0107] 1.3.2) Check if the water temperature in the water box 321 reaches Tx. If yes, start the cleaning spray assembly 5 to clean the filter screen 13 and end the process. If no, start the cooling device, close the heat dissipation channel of the condenser 421, that is, close the air inlet 34 and valve 35, use the heat of the condenser 421 to heat the filter screen 13, and when the temperature of the condenser 421 is greater than the preset heating temperature Ty, start the cleaning spray assembly 5 to spray water jets onto the condenser 421 to clean it and increase the temperature of the condensate collected in the water box 321 until the water temperature in the water box 321 reaches the preset cleaning temperature Tx. Then start the cleaning spray assembly 5 to spray water jets onto the filter screen 13 to clean it.

[0108] In the above steps, Q0 is the preset first airflow value, which can be 1m³ / s. 3 / min, Q1 is the preset second preset airflow value, which can be selected as 3m³ / min. 3 / min, Tx is the preset cleaning temperature, which is the temperature at which the filter screen grease is easier to clean, and can be set to 60-70 degrees. Ty can be set to 60 degrees.

[0109] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A range hood, comprising a first housing (1) and a second housing (2) disposed on the first housing (1), wherein an air inlet (11) is provided on the front side of the first housing (1), and a fan frame (21) fluidly communicating with the first housing (1) is provided inside the second housing (2), wherein a fan (22) is provided inside the fan frame (21); The range hood also includes a refrigeration unit located outside the first housing (1) and the fan frame (21), the refrigeration unit including a compressor (41), a condenser (421) and an evaporator (43); characterized in that: The range hood also includes a third housing (3) located before the first housing (1), and the condenser (421) includes fins (4211) and a main heat dissipation coil (4212) located in the third housing (3); The range hood also includes a cleaning spray assembly (5), which selectively sprays water into the first housing (1) or onto the fins (4211). The cleaning spray assembly (5) includes a water spraying element (51) and a spraying element (52) that can rotate relative to each other. The water spraying element (51) is connected to a water source and has a first nozzle (511). The spraying element (52) has a second nozzle (521) that is slit-shaped. The water spraying element (51) and the spraying element (52) can cooperate in at least the following modes: Water jet mode: The first nozzle (511) and the second nozzle (521) are misaligned, and water is sprayed directly from the first nozzle (511); Water mist mode: The first nozzle (511) and the second nozzle (521) overlap, and water is sprayed through the first nozzle (511) and the second nozzle (521) in sequence.

2. The range hood according to claim 1, characterized in that: The cleaning spray assembly (5) further includes a frame (53), a conduit (56), and a rotating shaft (58). The frame (53) has an opening (531). A notch (33) is provided on the rear side wall of the third housing (3) to accommodate the frame (53). The frame (53) can rotate relative to the third housing (3) and remains closed on the notch (33) during rotation. The water spray element (51) is disposed on the conduit (56) and is in fluid communication with the conduit (56). The conduit (56) is fixed to the frame (53). The first nozzle (511) faces the opening (531) of the frame (53). The spraying component (52) is mounted on a rotating shaft (58), which is rotatably connected to the frame (53).

3. The range hood according to claim 2, characterized in that: The cleaning spray assembly (5) also includes a water inlet pipe (57) connected to a water source. The conduit (56) is connected to the water inlet pipe (57). The water inlet pipe (57) is inserted through one end of the frame (53). The end of the frame (53) is provided with a water pipe storage groove (532). Part of the water inlet pipe (57) is stored in the water pipe storage groove (532).

4. The range hood according to claim 1, characterized in that: The third housing (3) is provided with a water box assembly (32) for receiving the condensate of the condenser (421) located below the condenser (421). The water box assembly (32) includes a water box (321) and a water pump (323), and the water pump (323) is connected to the water spray component (51).

5. The range hood according to claim 4, characterized in that: Inside the third housing (3), below the condenser (421), there is a baffle plate (31). The baffle plate (31) is located above the water box assembly (32). The baffle plate (31) gradually slopes downward from front to back. The water box (321) is at least partially located behind the baffle plate (31).

6. The range hood according to claim 1, characterized in that: The first housing (1) is provided with a filter screen (13). The condenser (421) also includes an auxiliary heat dissipation coil (4213). The auxiliary heat dissipation coil (4213) is arranged above and below the filter screen (13). One end of the auxiliary heat dissipation coil (4213) is connected to the main heat dissipation coil (4212) of the condenser (421), and the other end is connected to the compressor (41).

7. The range hood according to claim 1, characterized in that: The first housing (1) is provided with a filter screen (13). The condenser (421) also includes an auxiliary heat dissipation coil (4213). The auxiliary heat dissipation coil (4213) is arranged above and below the filter screen (13). One end of the auxiliary heat dissipation coil (4213) is connected to the main heat dissipation coil (4212) of the condenser (421) and the other end is connected to the compressor (41). The cleaning spray assembly (5) is arranged between the filter screen (13) and the fins (4211) of the condenser (421) and can spray towards the filter screen (13).

8. The range hood according to any one of claims 1 to 7, characterized in that: The compressor (41) and evaporator (43) are placed inside the second housing (2). The front side of the second housing (2) is provided with a cold air outlet (23) for blowing out the cold air after heat exchange with the evaporator (43). The top of the second housing (2) is provided with an air inlet (24) for making up the air for the evaporator (43).

9. The range hood according to claim 8, characterized in that: The second housing (2) has a downwardly recessed condensate collection tank (25) formed at the lower edge of the cold air outlet (23). The evaporator (43) is provided with a distributor (44) for spraying the condensate from the evaporator (43) onto the fins (4211) of the condenser (421). The condensate collection tank (25) and the distributor (44) are connected by a water pipe (26).

10. The range hood according to claim 9, characterized in that: The liquid distributor (44) includes a housing (441) and an orifice plate (442) disposed inside the housing (441). The orifice plate (442) is inclined upward from the left and right sides towards the middle. The water pipe (26) corresponds to the highest point of the orifice plate (442). A water leakage hole (443) is provided at the bottom of the housing (441).

11. The range hood according to any one of claims 1 to 7, characterized in that: The bottom of the fan frame (21) extends to the bottom of the second housing (2), and the bottom of the fan frame (21) is adapted to the top of the first housing (1).

12. The range hood according to claim 11, characterized in that: The fan frame (21) includes an upper part (211) and a lower part (212), and the lower part (212) of the fan frame is in a state of gradually tilting from the left and right sides to the middle from bottom to top.

13. The range hood according to any one of claims 1 to 7, characterized in that: The refrigeration device also includes a flow distribution plate (423) disposed below the fins (4211) of the condenser (421), and the third housing (3) includes an air inlet (34) and a valve (35) that allows communication between the inside of the third housing (3) and the inside of the fan frame (21) when the condenser (421) dissipates heat. The flow distribution plate (423) is set at the position corresponding to the air supply port (34). The flow distribution plate (423) has through holes (4231), with the through holes (4231) on the left and right sides having the smallest area and the through hole (4231) in the middle having the largest area.

14. The range hood according to claim 13, characterized in that: The flow distribution plate (423) is located below the cleaning spray assembly (5), so that the water spray component (51) and the spray component (52) of the cleaning spray assembly (5) can rotate to spray onto the flow distribution plate (423).

15. A heat dissipation control method for a range hood as described in claim 7, characterized in that: Includes the following steps: 1) Turn on the range hood and check if the cooling device is cooling. If it is, proceed to step 2). 2) Collect the current temperature T of the condenser (421), and then determine the operating condition of the refrigeration unit at this time: 2.1) If T < T0, where T0 is the preset normal operating temperature of the condenser (421), the refrigeration device continues to operate under the existing conditions, and then the heat dissipation control program ends; 2.2) If T0 < T ≤ T1, T1 is the preset heat dissipation threshold of the condenser (421). Then, determine whether cooking is in progress. If yes, proceed to step 2.2.1); otherwise, proceed to step 2.2.

2. 2.2.1) Determine whether the oil fume concentration has reached the preset threshold CF. If yes, start the cleaning spray assembly (5) to spray water mist onto the upper part of the filter (13), and then return to step 2); if no, proceed to step 2.2.2). 2.2.2) Start the cleaning spray assembly (5) to spray water mist onto the condenser (421) to cool it down, and then repeat step 2); 2.3) If T > T1, it means that the refrigeration device is under overheat protection. Start the cleaning spray assembly (5) to spray water mist onto the fins (4211) of the condenser (421) to cool it down. Then determine whether it is still under overheat protection. If yes, start the cleaning spray assembly (5) so that the cleaning spray assembly (5) completes one spray cooling of the condenser (421) in the first box (1) and the third box (3). Then repeat step 2). If no, repeat step 2).

16. A method for controlling the cleaning of a range hood filter as described in claim 7, characterized in that: The third housing (3) is provided with a water box assembly (32) for receiving condensate from the condenser (421). The water box assembly (32) includes a water box (321) and a water pump (323). The water pump (323) is connected to the water spray component (51). The filter cleaning control method includes the following steps: 1) Begin by determining the degree of contamination of the filter (13) and performing corresponding operations based on the detected degree of contamination: 1.1) If the air volume Q < Q0, Q is the air volume loss through the filter (13), Q0 is the first preset air volume value, and the cleaning control program ends; 1.2) If Q0<Q≤Q1, Q1 is the second preset air volume value. Whether to clean the filter depends on whether it is the season when the cooling unit is turned on (13). 1.3) If Q > Q1, the water temperature in the water box (321) reaches the preset cleaning temperature Tx and the filter screen (13) is cleaned by spraying water jets.

17. The filter cleaning control method for a range hood according to claim 16, characterized in that: In step 1.2), if it is the season for turning on the refrigeration unit, proceed to step 1.2.1); otherwise, proceed to step 1.2.

2. 1.2.1) Detect the water temperature in the water box (321) and compare it with the ambient temperature. If it is the same as the ambient temperature, wait for the next time the cooling device is turned on before judging the temperature. If it is higher than the ambient temperature, proceed to step 1.2.2). 1.2.2) Start the cleaning spray assembly (5) to spray water jets onto the filter screen (13) for cleaning, and the cleaning control program ends.

18. The filter cleaning control method for a range hood according to claim 17, characterized in that: In step 1.3), determine whether it is the season for turning on the refrigeration unit. If yes, proceed to step 1.3.1); otherwise, proceed to step 1.3.

2. 1.3.1) Check whether the water temperature in the water box (321) has reached the preset cleaning temperature Tx. If yes, start the cleaning spray assembly (5) to spray water jets onto the filter screen (13) for cleaning, and the cleaning control program ends. If no, wait for the next cooling device to be turned on before judging the temperature. 1.3.2) Check whether the water temperature in the water box (321) has reached the preset cleaning temperature Tx. If yes, start the cleaning spray assembly (5) to spray water jets onto the filter screen (13) for cleaning, and the cleaning control program ends. If no, start the refrigeration device to heat the filter screen (13) using the heat of the condenser (421). When the temperature of the condenser (421) is greater than the preset heating temperature Ty, start the cleaning spray assembly (5) to spray water jets onto the condenser (421) for cleaning, and increase the temperature of the condensate collected in the water box (321) until the water temperature in the water box (321) reaches the preset cleaning temperature Tx. Then start the cleaning spray assembly (5) to spray water jets onto the filter screen (13) for cleaning.

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