A control method of a refrigeration type range hood

Abstract

The application relates to a control method of a refrigeration type range hood, which comprises the following steps: controlling a refrigeration system and a cold air blower to work according to a set gear; when the ambient temperature r1 of the refrigeration type range hood is equal to a set temperature k2, the refrigeration temperature of the refrigeration system is adjusted, and the rotating speed of the cold air blower is reduced; when the adjusted refrigeration temperature of the refrigeration system is greater than k2, the working rotating speed and the heat exchange plate temperature of the cold air blower required when the air outlet of the cold air blower reaches a target temperature in the shortest time are calculated; the heat conduction plate and the heat exchange plate are controlled to be intermittently contacted, the temperature of the heat exchange plate is kept unchanged, the cold air blower is controlled to work according to the set working rotating speed; and when the ambient temperature of the refrigeration type range hood reaches r1*k3, the heat conduction plate and the heat exchange plate are controlled to be separated, and the cold air blower is controlled to work according to the set working rotating speed. The control method can realize the quick adjustment of the air outlet temperature of the cold air channel, greatly shorten the time for reaching the set temperature, and make the control more accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil fume purification, and in particular to a control method of a refrigeration type range hood. BACKGROUND

[0002] In order to improve the cooking environment, a refrigeration system is introduced into the range hood in the prior art, such as a Chinese utility model patent with the patent number ZL202220922936.X (the authorized announcement number CN217274392U) discloses a side range hood with refrigeration function. The oil fume hood forms an air inlet through the upper end opening of the mounting frame, and an air outlet is formed on the front end face of the mounting frame. Since the refrigeration device is connected to the outside air through the air inlet, the outside air enters the refrigeration device through the air inlet and is cooled into cold air, which is discharged to the room through the air outlet.

[0003] Although the refrigeration type range hood in the prior art can achieve the purpose of reducing the temperature of the kitchen, the existing refrigeration type range hood has the following use limitations: the cold air outlet of the existing refrigeration type range hood is usually arranged above the air inlet of the range hood. Due to the limitation of the overall volume, the range hoods on the market are mostly single refrigeration range hoods, i.e., they can only provide refrigeration function, and therefore cannot meet the different temperature requirements of users, thus greatly reducing the control accuracy and sensitivity of the temperature. SUMMARY

[0004] The present application solves the technical problem of the prior art by providing a control method of a refrigeration type range hood which can control the outlet air temperature by utilizing the heat of oil fume to meet the different temperature requirements of users.

[0005] The technical solution adopted by the present application to solve the above technical problem is as follows: a control method of a refrigeration type range hood, the refrigeration type range hood comprising a casing, the casing being provided with an oil fume channel and a cold air channel which are independent of each other, the cold air channel being provided with a cold air fan and a refrigeration system which is in fluid communication with the cold air fan, characterized in that: the oil fume channel is provided with a heat exchange grid, the cold air channel is provided with a heat exchange plate, and the casing is further provided with a heat conduction plate for connecting the heat exchange grid, the heat conduction plate being capable of being in contact with or separated from the heat exchange plate under the driving of a driving mechanism.

[0006] The control method comprises the following steps:

[0007] Step 1: starting the refrigeration system and the cold air fan;

[0008] Step 2: obtaining the ambient temperature k1 of the refrigeration type range hood, and confirming the working speed of the cold air fan;

[0009] Step 3: controlling the refrigeration system and the cold air fan to work according to the set gear;

[0010] Step 4, judge whether the ambient temperature k1 of the current refrigeration range hood is equal to the set temperature k2, if yes, turn to step 5; if no, turn to step 3;

[0011] Step 5, adjust the refrigeration temperature of the refrigeration system and reduce the rotating speed of the cooling fan;

[0012] Step 6, judge whether the adjusted refrigeration temperature k3 of the refrigeration system is greater than k2, if yes, turn to step 7; if no, turn to step 2;

[0013] Step 7, calculate the working rotating speed of the cooling fan and the heat exchange plate temperature k5 when the outlet of the cooling fan reaches the target temperature in the shortest time;

[0014] Step 8, control the intermittent contact between the heat conducting plate and the heat exchange plate, and keep the temperature k5 of the heat exchange plate unchanged;

[0015] Step 9, control the cooling fan to work according to the set working rotating speed;

[0016] Step 10, judge whether the ambient temperature of the current refrigeration range hood reaches r1*k3, r1 is a set constant, if yes, control the heat conducting plate and the heat exchange plate to separate, and turn to step 11; if no, turn to step 9;

[0017] Step 11, control the cooling fan to work according to the set working rotating speed;

[0018] Step 12, judge whether the ambient temperature k1 of the current refrigeration range hood reaches k3, if yes, turn to step 6; if no, turn to step 11.

[0019] Preferably, the set temperature k2 in step 4 is the target temperature required to be reached by the outlet of the cooling fan.

[0020] In order to control the temperature of the cooling fan outlet more accurately, the working rotating speed required by the cooling fan in step 7 is calculated as follows:

[0021] Calculate the difference dek1 between the adjusted refrigeration temperature k3 of the refrigeration system and the ambient temperature, and obtain the temperature k4 of the heat exchange grid in the current oil fume channel, and calculate the working rotating speed required by the cooling fan according to dek1, k4 and the current kitchen space information.

[0022] To achieve different temperature gradient adjustments, preferably, there are two heat exchange grids, namely a first heat exchange grid and a second heat exchange grid; there are also two heat conduction plates, namely a first heat conduction plate in contact with the first heat exchange grid and a second heat conduction plate in contact with the second heat exchange grid. The driving mechanism includes a first motor driven by the first heat conduction plate and a second motor driven by the second heat conduction plate. The first heat conduction plate can contact or separate from the heat exchange plate under the drive of the first motor, and the second heat conduction plate can contact or separate from the heat exchange plate under the drive of the second motor.

[0023] Preferably, the control logic for the intermittent contact between the heat-conducting plate and the heat exchange plate in step 8 is as follows:

[0024] Determine whether the temperature difference between the first heat exchange grid and the second heat exchange grid is greater than the preset temperature difference dek2. If so, control the first heat conduction plate to keep in contact with the heat exchange plate, and control the second heat conduction plate to keep in intermittent contact with the heat exchange plate, so as to keep the temperature k5 of the heat exchange plate constant. If not, control the first heat conduction plate to keep in intermittent contact with the heat exchange plate, and control the second heat conduction plate to keep in contact with the heat exchange plate, so as to keep the temperature k5 of the heat exchange plate constant.

[0025] To avoid the impact of oil fumes on the operation of the refrigeration system, an installation cavity is provided inside the housing. The cold air channel is located in the installation cavity. The heat exchange plate has a connecting part that passes through the wall of the cold air channel, and the first heat-conducting plate and the second heat-conducting plate can both contact the connecting part under the drive of their respective motors.

[0026] Preferably, the connecting part is L-shaped and includes a first connecting plate and a second connecting plate perpendicular to the first connecting plate. The first connecting plate, the first heat-conducting plate and the second heat-conducting plate are all arranged parallel to the heat exchange plate, and the first heat-conducting plate and the second heat-conducting plate can both contact the second connecting plate.

[0027] In order to increase the heat exchange area and improve the heat exchange efficiency, the cold air channel is also provided with multiple baffles spaced apart along the direction parallel to the second connecting plate, and the heat exchange plate is in contact with the end of each baffle.

[0028] Preferably, the air inlet of the fume duct is located at the lower part of the housing, and the air outlet of the cold air duct is located at the front of the housing and above the air inlet of the fume duct.

[0029] More preferably, the cold air duct is located in the front half of the housing, and the oil fume duct is located in the rear half of the housing and behind the cold air duct.

[0030] Compared with existing technologies, the advantages of this invention are as follows: By setting a heat exchange grid in the fume duct and a heat exchange plate in the cold air duct, and by setting a heat-conducting plate that can contact or separate from the heat exchange plate under the drive of the driving mechanism, the heat exchange grid can transfer heat from the fume duct to the heat exchange plate through the heat-conducting plate by controlling the intermittent contact between the heat-conducting plate and the heat exchange plate. This, in conjunction with the operation of the refrigeration system and the air cooler, ultimately achieves control of the outlet air temperature of the cold air duct. Therefore, this control method can achieve rapid adjustment of the outlet air temperature of the cold air duct, greatly shortening the time to reach the set temperature, making the control more precise, and improving the temperature control accuracy and sensitivity. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the refrigerated range hood in an embodiment of the present invention;

[0032] Figure 2 for Figure 1 A sectional view;

[0033] Figure 3 for Figure 1 A partial structural diagram. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0035] like Figures 1 to 3 As shown, the refrigerated range hood in this embodiment includes a housing 1. The housing 1 contains independent fume ducts 1a and cold air ducts 1b. The cold air duct 1b contains a cooler (not shown) and a refrigeration system (not shown) in fluid communication with the cooler. The fume duct 1a contains a heat exchange grid, and the cold air duct 1b contains a heat exchange plate 10. The housing 1 also contains a heat-conducting plate for connecting the heat exchange grid. The heat-conducting plate can contact or separate from the heat exchange plate 10 under the drive of a driving mechanism. The refrigeration system and cooler in this embodiment are existing technologies and will not be elaborated further here. Please refer to the content disclosed in patent number ZL202222533236.4, "A Refrigerated Range Hood".

[0036] like Figure 2 and Figure 3As shown, this embodiment has two heat exchange grids, namely a first heat exchange grid 11 and a second heat exchange grid 12; there are also two heat conduction plates, namely a first heat conduction plate 21 that contacts the first heat exchange grid 11 and a second heat conduction plate 22 that contacts the second heat exchange grid 12. The driving mechanism includes a first motor 31 that is driven and connected to the first heat conduction plate 21 and a second motor 32 that is driven and connected to the second heat conduction plate 22. The first heat conduction plate 21 can contact or separate from the heat exchange plate 10 under the drive of the first motor 31, and the second heat conduction plate 22 can contact or separate from the heat exchange plate 10 under the drive of the second motor 32. In this embodiment, both the first heat exchange grid 11 and the second heat exchange grid 12 are provided with through holes for the passage of oil fumes.

[0037] like Figure 2 As shown, the housing 1 also includes an installation cavity 1c, and a cold air channel 1b is located within the installation cavity 1c. The heat exchange plate 10 has a connecting portion 4 that passes through the wall of the cold air channel 1b, and the first heat-conducting plate 21 and the second heat-conducting plate 22 can both contact the connecting portion 4 under the drive of their respective motors. In this embodiment, the connecting portion 4 is L-shaped, including a first connecting plate 41 and a second connecting plate 42 perpendicular to the first connecting plate 41. The first connecting plate 41, the first heat-conducting plate 21, and the second heat-conducting plate 22 are all arranged parallel to the heat exchange plate 10, and both the first heat-conducting plate 21 and the second heat-conducting plate 22 can contact the second connecting plate 42. In addition, the cold air channel 1b is also provided with a plurality of partitions 5 spaced apart along a direction parallel to the second connecting plate 42, and the heat exchange plate 10 contacts the end of each partition 5.

[0038] In this embodiment, by directly contacting the heat exchange plate 10 with the partition 5 in the cold air channel 1b, the effective heat exchange area is greatly increased, the heat exchange efficiency is improved, and the temperature adjustment time is shortened.

[0039] The air inlet 10a of the fume duct 1a is located at the lower part of the housing 1, and the air outlet 10b of the cold air duct 1b is located on the front side of the housing 1 and above the air inlet 10a of the fume duct 1a. Furthermore, the cold air duct 1b is located in the front half of the housing 1, and the fume duct 1a is located in the rear half of the housing 1 and behind the cold air duct 1b.

[0040] The control method for the refrigerated range hood in this embodiment includes the following steps:

[0041] Step 1: Start the refrigeration system and air cooler;

[0042] Step 2: Obtain the ambient temperature k1 of the current cooling range hood and confirm the operating speed of the cooling fan;

[0043] Step 3: Control the refrigeration system and air cooler to operate according to the set settings;

[0044] Step 4: Determine whether the ambient temperature k1 of the current cooling range hood is equal to the set temperature k2. If yes, proceed to step 5; otherwise, proceed to step 3.

[0045] In this embodiment, temperature k2 is set as the target temperature that the air outlet of the air cooler needs to reach;

[0046] Step 5: Adjust the cooling temperature of the refrigeration system and reduce the speed of the air cooler;

[0047] Step 6: Determine whether the adjusted cooling temperature k3 of the refrigeration system is greater than k2. If yes, proceed to step 7; otherwise, proceed to step 2.

[0048] Step 7: Calculate the required operating speed of the air cooler and the temperature k5 of the heat exchange plate 10 when the air outlet of the air cooler reaches the target temperature in the shortest time.

[0049] In this embodiment, the required operating speed of the air cooler is calculated as follows:

[0050] The difference between the adjusted cooling temperature k3 and the ambient temperature dek1 is calculated, and the current heat exchange grid temperature k4 in the fume duct 1a is obtained. Based on dek1, k4 and the current kitchen space information, the required operating speed of the air cooler is calculated. In addition, the current kitchen space information is estimated by recording the working time of the air cooler, the cooling system and the stove.

[0051] Step 8: Control the intermittent contact between the heat conduction plate and the heat exchange plate 10 to keep the temperature k5 of the heat exchange plate 10 constant;

[0052] Step 9: Control the air cooler to operate at the set operating speed;

[0053] Step 10: Determine whether the ambient temperature of the current cooling range hood has reached r1*k3, where r1 is a set constant. If yes, control the heat conduction plate and heat exchange plate 10 to separate and proceed to step 11; otherwise, proceed to step 9.

[0054] Step 11: Control the air cooler to operate at the set operating speed;

[0055] Step 12: Determine whether the ambient temperature k1 of the current cooling range hood has reached k3. If yes, proceed to step 6; otherwise, proceed to step 11.

[0056] In step 8 of this embodiment, the control logic for the intermittent contact between the heat-conducting plate and the heat exchange plate 10 is as follows:

[0057] If the temperature difference between the first heat exchange grid 11 and the second heat exchange grid 12 is greater than the preset temperature difference dek2, then the first heat-conducting plate 21 is kept in contact with the heat exchange plate 10, and the second heat-conducting plate 22 is kept in intermittent contact with the heat exchange plate 10, so that the temperature k5 of the heat exchange plate 10 remains unchanged; otherwise, the first heat-conducting plate 21 is kept in intermittent contact with the heat exchange plate 10, and the second heat-conducting plate 22 is kept in contact with the heat exchange plate 10, so that the temperature k5 of the heat exchange plate 10 remains unchanged.

[0058] This invention utilizes the first heat exchange grid 11 and the second heat exchange grid 12 to extract heat from the fume duct 1a, transferring the heat from the fumes in the fume duct 1a to the cold air duct 1b. This enables precise control of the outlet temperature of the cold air duct 1b. Furthermore, the selective use of the first heat exchange grid 11 and the second heat exchange grid 12 significantly improves the sensitivity of the airflow control in the cold air duct 1b, allowing for precise and rapid temperature increases and decreases within a short period, greatly enhancing user comfort. This cooling range hood also enables the reuse of waste heat in the fume duct by transferring heat from the fume duct to the cold air duct 1b, thereby cooling the fume duct, improving fume treatment capacity, and reducing the risk of excessive temperature rise of the main fan motor in the fume duct, making the use of the range hood more scientific.

Claims

1. A control method for a refrigerated range hood, the refrigerated range hood comprising a housing (1), wherein the housing (1) has an independent fume duct (1a) and a cold air duct (1b), and the cold air duct (1b) is provided with a cooler and a refrigeration system fluidly connected to the cooler, characterized in that: The fume duct (1a) is provided with heat exchange grids (11, 12), the cold air duct (1b) is provided with heat exchange plates (10), and the housing (1) is also provided with heat-conducting plates (21, 22) for connecting the heat exchange grids (11, 12). The heat-conducting plates (21, 22) can contact or separate from the heat exchange plates (10) under the drive of the drive mechanism (31, 32). The control method includes the following steps: Step 1: Start the refrigeration system and air cooler; Step 2: Obtain the ambient temperature k1 of the current cooling range hood and confirm the operating speed of the cooling fan; Step 3: Control the refrigeration system and air cooler to operate according to the set settings; Step 4: Determine whether the ambient temperature k1 of the current cooling range hood is equal to the set temperature k2. If yes, proceed to step 5; otherwise, proceed to step 3. Step 5: Adjust the cooling temperature of the refrigeration system and reduce the speed of the air cooler; Step 6: Determine whether the adjusted cooling temperature k3 of the refrigeration system is greater than k2. If yes, proceed to step 7; otherwise, proceed to step 2. Step 7: Calculate the required operating speed of the air cooler and the temperature k5 of the heat exchange plate (10) when the air outlet of the air cooler reaches the target temperature in the shortest time. Step 8: Control the intermittent contact between the heat-conducting plate (21, 22) and the heat exchange plate (10) to keep the temperature k5 of the heat exchange plate (10) constant; Step 9: Control the air cooler to operate at the set operating speed; Step 10: Determine whether the ambient temperature of the current cooling range hood has reached r1*k3, where r1 is a set constant. If yes, control the heat conduction plate (21, 22) and the heat exchange plate (10) to separate and proceed to step 11; otherwise, proceed to step 9. Step 11: Control the air cooler to operate at the set operating speed; Step 12: Determine whether the ambient temperature k1 of the current cooling range hood has reached k3. If yes, proceed to step 6; otherwise, proceed to step 11.

2. The control method according to claim 1, characterized in that: The set temperature k2 in step 4 is the target temperature that the air outlet of the air cooler needs to reach.

3. The control method according to claim 1, characterized in that: The calculation method for the required operating speed of the air cooler in step 7 is as follows: Calculate the difference between the adjusted cooling temperature k3 and the ambient temperature dek1, and obtain the current heat exchange grid temperature k4 in the fume duct (1a). Based on dek1, k4 and the current kitchen space information, calculate the required operating speed of the air cooler.

4. The control method according to claim 1, characterized in that: There are two heat exchange grids (11, 12), namely a first heat exchange grid (11) and a second heat exchange grid (12); there are also two heat conduction plates (21, 22), namely a first heat conduction plate (21) in contact with the first heat exchange grid (11) and a second heat conduction plate (22) in contact with the second heat exchange grid (12). The driving mechanism (31, 32) includes a first motor (31) connected to the first heat conduction plate (21) and a second motor (32) connected to the second heat conduction plate (22). The first heat conduction plate (21) can contact or separate from the heat exchange plate (10) under the drive of the first motor (31), and the second heat conduction plate (22) can contact or separate from the heat exchange plate (10) under the drive of the second motor (32).

5. The control method according to claim 4, characterized in that: The control logic for the intermittent contact between the heat-conducting plates (21, 22) and the heat exchange plate (10) in step 8 is as follows: Determine whether the temperature difference between the first heat exchange grid (11) and the second heat exchange grid (12) is greater than the preset temperature difference dek2. If so, control the first heat-conducting plate (21) to keep in contact with the heat exchange plate (10), and control the second heat-conducting plate (22) to keep in intermittent contact with the heat exchange plate (10) to keep the temperature k5 of the heat exchange plate (10) unchanged. If not, control the first heat-conducting plate (21) to keep in intermittent contact with the heat exchange plate (10), and control the second heat-conducting plate (22) to keep in contact with the heat exchange plate (10) to keep the temperature k5 of the heat exchange plate (10) unchanged.

6. The control method according to claim 5, characterized in that: The housing (1) is also provided with an installation cavity (1c), the cold air channel (1b) is located in the installation cavity (1c), the heat exchange plate (10) has a connecting part (4) that passes through the wall of the cold air channel (1b), and the first heat conduction plate (21) and the second heat conduction plate (22) can both contact the connecting part (4) under the drive of their respective motors.

7. The control method according to claim 6, characterized in that: The connecting part (4) is L-shaped and includes a first connecting plate (41) and a second connecting plate (42) perpendicular to the first connecting plate (41). The first connecting plate (41), the first heat-conducting plate (21), and the second heat-conducting plate (22) are all arranged parallel to the heat exchange plate (10), and the first heat-conducting plate (21) and the second heat-conducting plate (22) can both contact the second connecting plate (42).

8. The control method according to claim 7, characterized in that: The cold air duct (1b) is also provided with a plurality of partitions (5) spaced apart along the direction parallel to the second connecting plate (42), and the heat exchange plate (10) is in contact with the end of each partition (5).

9. The control method according to any one of claims 1 to 8, characterized in that: The air inlet (10a) of the fume duct (1a) is located at the lower part of the housing (1), and the air outlet (10b) of the cold air duct (1b) is located on the front side of the housing (1) and above the air inlet (10a) of the fume duct (1a).

10. The control method according to claim 9, characterized in that: The cold air duct (1b) is located in the front half of the housing (1), and the oil fume duct (1a) is located in the rear half of the housing (1) and is located behind the cold air duct (1b).

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