Method for operating a refrigeration system of a hood

Abstract

The application relates to a refrigeration system working method of a refrigeration oil smoke extractor, which comprises the following steps: S1, initialization; S2, after the refrigeration system is started to work, the swing blade is controlled to reciprocate within the range of the set maximum swing angle theta max and minimum swing angle theta min; S3, the maximum rotating speed Smax of the cold air fan is determined according to the ambient temperature, and the minimum rotating speed Smin of the cold air fan is determined according to the current cooking smoke concentration n and the working parameter d of the oil smoke extractor; S4, the swing blade angle theta is obtained; S5, when (theta1+theta2) / 2<theta<theta max, the rotating speed of the cold air fan is controlled to be Smax; when theta1<=theta<= (theta1+theta2) / 2, the rotating speed of the cold air fan is gradually reduced relative to Smax based on the gradual reduction of the swing blade swing angle; and when theta min<=theta<theta1, the rotating speed of the cold air fan is controlled to be Smin. The refrigeration system working method of the refrigeration oil smoke extractor can adjust the rotating speed of the cold air fan based on the kitchen working condition and the blowing position, improve the user comfort, and reduce the influence on the smoke gathering effect.

Description

Technical Field

[0001] This invention relates to a working method of a refrigeration system for a refrigerated range hood. Background Technology

[0002] To improve the cooking environment, existing technologies have incorporated cooling fans into range hoods to provide a more comfortable cooking experience. For example, the Chinese utility model patent CN209147181U (application number 201821658638.4), entitled "A Cooling Range Hood," includes a cooling component comprising a cooling fan and a cooling duct. The activation of this component is determined based on the ambient temperature. However, the cooling fan in this type of range hood typically operates at a relatively stable speed. Unlike ordinary cooling devices such as air conditioners, where the user's activity area is generally not directly facing the cooling air outlet, cooling range hoods are used in relatively small kitchens where users are typically positioned in front of the stove while cooking. In this situation, the cooling air outlet is directly facing the user's activity area, making a higher demand for comfortable airflow and a greater concern about its impact on smoke extraction. Therefore, this type of cooling range hood often presents the following problems:

[0003] 1. Kitchens are generally small, and the cold air blown out by the evaporative cooler may be directly drawn away by the fan in the range hood, resulting in poor cooling effect;

[0004] 2. When the baffle of the range hood opens at a small angle, the cold air will move downward along the surface of the decorative cover. If the air conditioner fan speed is high at this time, the smoke above the cookware will be significantly disturbed and diffused, which will affect the smoke collection effect of the range hood and cause serious smoke leakage.

[0005] 3. If the airflow of the evaporative cooler is small, the kitchen will cool down slowly. If the airflow of the evaporative cooler is large, the user will be exposed to cold air blowing directly on their head or upper body while cooking. Over time, this can easily cause the user to catch a cold or feel uncomfortable. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a working method for a cooling system of a range hood that can be cooled based on kitchen conditions and the position of the blower to adjust the speed of the cooling fan.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a working method of a cooling system for a refrigerated range hood, the refrigerated range hood including a housing, a range hood fan and a cooling system disposed within the housing, the cooling system including a cold air blower, a cold air outlet corresponding to the air outlet of the cold air blower on the housing, and a swing blade that can swing up and down on the cold air outlet, characterized by including the following steps:

[0008] S1. Initialize the maximum swing angle θmax and minimum swing angle θmin of the blades relative to the vertical direction. Initialize the swing angle range θ1~θ2 for users whose air is directly blowing on the cold air, where θmin<θ1<θ2<θmax.

[0009] S2. After the refrigeration system starts working, control the swing blades to swing back and forth within the set maximum swing angles θmax and θmin.

[0010] S3. Determine the maximum speed Smax of the air cooler based on the ambient temperature, and determine the minimum speed Smin of the air cooler based on the current cooking smoke concentration n and the working parameters d of the range hood.

[0011] S4. Obtain the real-time swing angle θ of the blade relative to the vertical direction;

[0012] S5. When (θ1+θ2) / 2<θ<θmax, control the speed of the air cooler to Smax;

[0013] When θ1≤θ≤(θ1+θ2) / 2, based on the gradual decrease of the oscillation angle of the blades, the speed of the air cooler is controlled to gradually decrease relative to Smax;

[0014] When θmin≤θ<θ1, the speed of the air cooler is controlled to be Smin.

[0015] As an improvement, in step S5, the distance p between the user and the stove is detected and obtained. Different speed reduction parameters r are determined based on different distances p. Then, when θ1≤θ≤(θ1+θ2) / 2, the speed of the air cooler is adjusted according to the speed reduction parameter r relative to the maximum speed Smax until the speed drops to the minimum speed Smin.

[0016] As an improvement, the method for determining different deceleration parameters r based on different values ​​of p includes the following steps:

[0017] SA1. Compare p with the set distance threshold p1. If p > p1, it is determined that the user is not in front of the stove, and SA2 is performed. If p ≤ p1, it is determined that the user is in front of the stove, and SA3 is performed.

[0018] SA2. Calculate V1 = (Smax - Smin) / [(θ2 - θ1) / 2H], where H is the speed adjustment cycle of the air cooler; if the exhaust fan parameter d is less than the set parameter, then r = V1; if the exhaust fan parameter is greater than or equal to the set parameter, then r = k1 * (θ + θ2 - 2θ1) * V1 / θ2 - θ1, where k1 is the first calculation parameter;

[0019] SA3: Detect and obtain the current cooking environment temperature t, and compare t with the set temperature threshold T4. If t ≥ T4, proceed to SA2; if t < T4, proceed to SA4.

[0020] SA4. Calculate V2 = (Smax - Smin) / [(θ2 - θ1) / H]; If the parameters of the range hood are less than the set parameters, then r = V2;

[0021] If the fume extraction parameter d is greater than or equal to the set parameter, then r = k3*(θ+2θ2-3θ1)*V2 / 2(θ2-θ1), where k3 is the third calculation parameter.

[0022] As an improvement, the deceleration parameter r is further adjusted based on the current cooking smoke concentration n.

[0023] As an improvement, in step SA2, if n≥N2, where N2 is the second flue gas concentration threshold, then r=r+k2*V1, where k2 is the second calculation coefficient;

[0024] In step SA3, if n≥N3, where N3 is the third flue gas concentration threshold, then r=r+k4*V2, where k4 is the fourth calculation coefficient.

[0025] Preferably, the maximum speed Smax of the air cooler in this operation is determined according to the comparison table of different initial temperature ranges and the maximum speed of the air cooler.

[0026] Simply put, when determining the minimum speed Smin of the evaporative air cooler, if n < N1, where N1 is the first smoke concentration threshold, and the range hood parameter d is less than the set parameter, it indicates that the cooking smoke is relatively small and the range hood airflow is relatively small, and the minimum speed Smin of the evaporative air cooler is set to S4 accordingly; if n < N1, and the range hood parameter d is greater than or equal to the set parameter, it indicates that the cooking smoke is relatively small and the range hood airflow is relatively large, and the minimum speed Smin of the evaporative air cooler is set to S5 accordingly. If n≥N1 and the range hood parameter d is less than the set parameter, it indicates that the cooking fumes are large and the range hood fan volume is small. The minimum speed of the evaporative air cooler is set to Smin = S6 accordingly. If n≥N1 and the range hood parameter d is greater than or equal to the set parameter, it indicates that the cooking fumes are large and the range hood fan volume is large. The minimum speed of the evaporative air cooler is set to Smin = S7 accordingly. S4, S5, S6, and S7 are all preset speed values, and S4 > S5 > S6 > S7.

[0027] Compared with the prior art, the advantages of the present invention are as follows: the cooling system of the refrigerated range hood in the present invention operates at different speeds when the oscillating blades swing to different angles. Compared with the fixed speed of the refrigerated fan in the prior art, it can improve the user's comfort while ensuring the cooling of the cooking space. At the same time, it can also avoid the interference of the cold air blown out by the refrigerated fan with the smoke above the cookware, thus avoiding the impact on the smoke collection effect of the range hood and solving the problem of smoke escape caused by the refrigerated fan. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating the working method of the refrigeration system of the refrigerated range hood in an embodiment of the present invention. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] The cooling system operation method of the refrigerated range hood in this embodiment is used in refrigerated range hoods. A refrigerated range hood typically includes a casing, a range hood fan, and a cooling system housed within the casing. The cooling system includes a cold air blower, and a cold air outlet is provided on the casing corresponding to the outlet of the cold air blower. The cold air outlet has a swing blade that can swing up and down. By controlling the swing blade's swing, the direction of the cold air blown out by the cold air blower can be adjusted. The cold air outlet is usually located at the upper part of the range hood. The swing blade can perform a reciprocating up-and-down swing motion. The maximum swing angle θmax and minimum swing angle θmin relative to the vertical direction of the swing blade can be set as needed. The minimum angle θmin is the minimum limit angle value during the swing process of the swing blade. This angle ensures that even at the highest output level of the cold air blown by the cold air blower, it can still flow out normally with low noise. Generally, θmin is set to 30°. The maximum angle θmax is the maximum limit angle value during the swing process of the swing blade. This angle may be affected by the mechanical structure or can be set manually; it can be set to 75°, while the swing blade's movement speed is fixed. To facilitate the following air cooler speed adjustment, the air cooler speed adjustment cycle is set to H in this embodiment. H is the duration corresponding to the blade swing of 0.5°. In this embodiment, H is approximately 60ms.

[0031] The cold air from an evaporative air cooler typically blows horizontally towards the oscillating blades, and after reflection, is blown downwards into the cooking space. Setting the oscillation angle of the oscillating blades relative to the vertical direction as θx, a simple calculation shows that when θx > 45°, the angle between the direction of the cold air movement and the vertical plane after reflection is θy = 2*(θx - 45°). Therefore, based on factors such as the direction of cold air movement, user experience, and impact on fumes, the required angle range for adjusting the evaporative air cooler's fan speed can be determined. The angle range where the cold air blows directly onto the user's head can usually be used as this range. Therefore, it is necessary to determine the oscillation angle range θ1 to θ2 corresponding to the cold air blowing directly on the user.

[0032] A first threshold angle θ1 is preset for the swing angle of the oscillating blades relative to the vertical direction. When the oscillating blades reach this angle, the cold air will mostly move downwards along the surface of the decorative cover, thus affecting the range hood's smoke collection effect. Obviously, when θ1 equals 45°, under the action of the oscillating blades, the cold air blown out by the fan will change from a horizontal flow to a vertical downward flow. At this time, if there is rising smoke above the cookware, it will escape due to the influence of the vertically downward cold air. For safety and to consider accuracy errors, the first threshold angle is generally set to an angle greater than 45°. In this embodiment, θ1 is set to 47°.

[0033] A second threshold θ2 is preset for the swing angle of the oscillating blades relative to the vertical direction. When the oscillating blade angle is greater than θ1 and less than θ2, if the user is cooking or frying in front of the stove, the cold air will blow directly onto the user's head. If the user's height is set to be between 155cm and 180cm, the height difference between the top of the head and the air outlet is between 45cm and 70cm, based on the overall installation height. If the second threshold θ2 is set to 57°, the horizontal distance D between the top of the head and the decorative cover is between 20cm and 31cm, which is within the user's normal activity range. Therefore, in this embodiment, the oscillating blade angle range θ1~θ2 corresponding to the cold air blowing directly onto the user is set to 47°~57°.

[0034] like Figure 1 As shown, the working method of the refrigeration system of the refrigerated range hood includes the following steps.

[0035] S1. Initialize the maximum swing angle θmax and minimum swing angle θmin of the blades relative to the vertical direction. Initialize the swing angle range θ1~θ2 of the blades for users whose air is directly blowing on them, where θmin<θ1<θ2<θmax.

[0036] S2. After the refrigeration system starts working, the control blades are oscillating back and forth within the set maximum oscillation angles θmax and θmin. In order to ensure that the air cooler can start normally, the initial maximum speed Smax0 and the initial minimum speed Smin0 of the air cooler are usually initialized in S1, and the air cooler is controlled to start working first according to the initial minimum speed Smin0.

[0037] S3. Determine the maximum speed Smax of the evaporative air cooler based on the ambient temperature, and determine the minimum speed Smin of the evaporative air cooler based on the current cooking smoke concentration n and the working parameters d of the exhaust fan.

[0038] Specifically, during the research and development phase, the optimal maximum speed of the air cooler can be experimentally determined for different temperature ranges. Thus, in step S1, an initial table is created to correlate different temperature ranges with the maximum air cooler speed. For example, for a temperature range greater than or equal to the first temperature threshold T1, the corresponding maximum air cooler speed Smax is S1; for a temperature range from T1 to T2, the corresponding maximum air cooler speed Smax is S2, where T2 is the second temperature threshold and T2 < T1; for a temperature range less than or equal to T2, the corresponding maximum air cooler speed Smax is S3. In this embodiment, T1 is 29℃, T2 is 26℃, S1 is 1600 rpm, S2 is 1300 rpm, and S3 is 1000 rpm. That is, the higher the ambient temperature, the higher the corresponding maximum air cooler speed, thus meeting the cooling demand at high temperatures.

[0039] Then, based on the temperature range of the current cooking environment, the maximum speed Smax of the air cooler is determined in this operation according to the initial table of different temperature ranges and maximum speed of the air cooler.

[0040] When determining the minimum speed Smin of the evaporative air cooler, if n < N1, where N1 is the first smoke concentration threshold, and the range hood parameter d is less than the set parameter, it indicates that the cooking smoke is relatively low and the range hood airflow is relatively low; therefore, the minimum speed Smin of the evaporative air cooler is set to S4. If n < N1, and the range hood parameter d is greater than or equal to the set parameter, it indicates that the cooking smoke is relatively low and the range hood airflow is relatively high; therefore, the minimum speed Smin of the evaporative air cooler is set to S5. If n ≥ N1 and the range hood parameter d is less than the set parameter, it indicates that the cooking fumes are large and the range hood airflow is small. Therefore, the minimum speed of the evaporative air cooler is set to Smin = S6. If n ≥ N1 and the range hood parameter d is greater than or equal to the set parameter, it indicates that the cooking fumes are large and the range hood airflow is large. Therefore, the minimum speed of the evaporative air cooler is set to Smin = S7. S4, S5, S6, and S7 are preset speed values, with S4 > S5 > S6 > S7. In this embodiment, N1 is 2 mg / m3, S4 is 1000 rpm, S5 is 850 rpm, S6 is 700 rpm, and S7 is 650 rpm. That is, the higher the fumes concentration, the larger the range hood parameter d, and the smaller the minimum speed of the evaporative air cooler, thus reducing the impact of the evaporative air cooler's output on the fume extraction effect.

[0041] S4. Obtain the real-time swing angle θ of the blades relative to the vertical direction; during the reciprocating motion, regardless of the direction of change of θ, the air cooler speed is the same for the same swing angle θ.

[0042] S5. When (θ1+θ2) / 2<θ<θmax, control the speed of the air cooler to Smax.

[0043] When θ1≤θ≤(θ1+θ2) / 2, the speed of the air cooler is gradually reduced relative to Smax based on the gradual decrease of the swing angle of the blades.

[0044] When θmin≤θ<θ1, the speed of the air cooler is controlled to be Smin.

[0045] In order to ensure that the speed adjustment of the air cooler matches the user's experience and the smoke environment in the kitchen, in step S5, the distance p between the user and the stove is detected and obtained. Based on different distances p, different speed reduction parameters r are determined. Then, when θ1≤θ≤(θ1+θ2) / 2, the air cooler speed is adjusted and reduced according to the speed reduction parameter r, compared to the maximum speed Smax, until the speed drops to the minimum speed Smin, and then the adjustment is stopped.

[0046] Specifically, the method for determining different deceleration parameters r based on different values ​​of p includes the following steps:

[0047] SA1. Compare p with the set distance threshold p1. If p > p1, it is determined that the user is not in front of the stove, and SA2 is performed. If p ≤ p1, it is determined that the user is in front of the stove, and SA3 is performed.

[0048] SA2. Calculate V1 = (Smax - Smin) / [(θ2 - θ1) / 2H], where H is the air cooler speed adjustment cycle. If the range hood parameter d is less than the set parameter, then r = V1; if the range hood parameter is greater than or equal to the set parameter, then r = k1 * (θ + θ2 - 2θ1) * V1 / θ2 - θ1, where k1 is the first calculation parameter. In this embodiment, k1 is 0.8. Therefore, a larger range hood parameter indicates a poorer smoke environment in the kitchen, meaning a relatively larger smoke volume and concentration. Thus, it is necessary to reduce the air cooler speed more quickly to minimize its impact on the smoke.

[0049] SA3: Detect the current cooking environment temperature t and compare it with the set temperature threshold T4. If t ≥ T4, it indicates that the temperature of the Polygonatum is high, and operating the air cooler at a higher speed will provide coolness to the user; in this case, proceed to SA2. If t < T4, proceed to SA4, that is, when the ambient temperature is low, adjust the air cooler speed with a smaller reduction parameter than V1 to improve user comfort. In this embodiment, T4 is 28℃.

[0050] SA4. Calculate V2 = (Smax - Smin) / [(θ2 - θ1) / H]; if the parameters of the range hood are less than the set parameters, then r = V2.

[0051] If the fume extraction parameter d is greater than or equal to the set parameter, then r = k3*(θ+2θ2-3θ1)*V2 / 2(θ2-θ1), where k3 is the third calculation parameter. In this embodiment, k3 is 0.8.

[0052] The aforementioned parameters for fume extraction can be the fume extraction fan speed setting, the fume extraction fan rotation speed, or the fume extraction fan airflow.

[0053] In addition, the speed reduction parameter r is further adjusted based on the current cooking smoke concentration n, thereby taking into account the influence of the evaporator speed on the cooking smoke concentration n, making the adjustment of the evaporator speed more reasonable and reducing the impact of the cold air blown out by the evaporator on the smoke collection effect.

[0054] Specifically, in step SA2, if n ≥ N2, where N2 is the second flue gas concentration threshold, then r = r + k2 * V1, where k2 is the second calculation coefficient; in this embodiment, k2 is 0.25 and N2 is 2.5 mg / m³. 3 .

[0055] In step SA3, if n ≥ N3, where N3 is the third flue gas concentration threshold, then r = r + k4 * V2, where k4 is the fourth calculation coefficient. In this embodiment, k4 is 0.25, and N3 is 2.5 mg / m³. 3 .

[0056] The cooling system of the refrigerated range hood in this invention operates by adjusting the speed of the cooling fan according to different rotation speeds when the oscillating blades swing to different angles. Compared to the fixed rotation speed of the cooling fan in the prior art, this method can improve user comfort while ensuring the cooling of the cooking space. It also avoids the interference of the cold air blown out by the cooling fan with the smoke above the cookware, thus avoiding any impact on the smoke collection effect of the range hood and solving the problem of smoke leakage caused by the cooling fan.

Claims

1. A method for operating the refrigeration system of a refrigerated range hood, the refrigerated range hood comprising a housing, a range hood fan and a refrigeration system disposed within the housing, the refrigeration system comprising a cold air blower, a cold air outlet corresponding to the air outlet of the cold air blower on the housing, and a swing blade that can swing up and down on the cold air outlet, characterized in that: Includes the following steps: S1. Initialize the maximum swing angle θmax and minimum swing angle θmin of the blades relative to the vertical direction. Initialize the swing angle range θ1~θ2 of the blades for users directly blowing cold air, where θmin<θ1<θ2<θmax. S2. After the refrigeration system starts working, control the swing blades to swing back and forth within the set maximum swing angles θmax and θmin. S3. Determine the maximum speed Smax of the air cooler based on the ambient temperature, and determine the minimum speed Smin of the air cooler based on the current cooking smoke concentration n and the working parameters d of the range hood. S4. Obtain the real-time swing angle θ of the blade relative to the vertical direction; S5. When (θ1+θ2) / 2<θ<θmax, control the speed of the air cooler to Smax; When θ1≤θ≤(θ1+θ2) / 2, based on the gradual decrease of the oscillation angle of the blades, the speed of the air cooler is controlled to gradually decrease relative to Smax; When θmin≤θ<θ1, the speed of the air cooler is controlled to be Smin; When performing step S5, the distance p between the user and the stove is detected and obtained. Different speed reduction parameters r are determined based on different distances p. Then, when θ1≤θ≤(θ1+θ2) / 2, the speed of the air cooler is adjusted according to the speed reduction parameter r relative to the maximum speed Smax until the speed drops to the minimum speed Smin. The method for determining different deceleration parameters r based on different values ​​of p includes the following steps: SA1. Compare p with the set distance threshold p1. If p > p1, it is determined that the user is not in front of the stove, and SA2 is performed. If p ≤ p1, it is determined that the user is in front of the stove, and SA3 is performed. SA2. Calculate V1=(Smax-Smin) / [(θ2-θ1) / 2H], where H is the speed adjustment cycle of the air cooler; if the exhaust fan parameter d is less than the set parameter, then r=V1; if the exhaust fan parameter is greater than or equal to the set parameter, then r=k1*(θ+θ2-2θ1)*V1 / θ2-θ1, where k1 is the first calculation parameter; SA3: Detect and obtain the current cooking environment temperature t, and compare t with the set temperature threshold T4. If t ≥ T4, proceed to SA2; if t < T4, proceed to SA4. SA4. Calculate V2 = (Smax - Smin) / [(θ2 - θ1) / H]; If the parameters of the range hood are less than the set parameters, then r = V2; If the fume extraction parameter d is greater than or equal to the set parameter, then r = k3*(θ+2θ2-3θ1)*V2 / 2(θ2-θ1), where k3 is the third calculation parameter.

2. The working method of the refrigeration system of the refrigerated range hood according to claim 1, characterized in that: The reduction rate parameter r is further adjusted based on the current cooking smoke concentration n.

3. The working method of the refrigeration system of the refrigerated range hood according to claim 2, characterized in that: In step SA2, if n≥N2, where N2 is the second flue gas concentration threshold, then r=r+k2*V1, where k2 is the second calculation coefficient; In step SA3, if n≥N3, where N3 is the third flue gas concentration threshold, then r=r+k4*V2, where k4 is the fourth calculation coefficient.

4. The working method of the refrigeration system of the refrigerated range hood according to any one of claims 1 to 3, characterized in that: The maximum speed Smax of the air cooler in this operation is determined based on the table of different initial temperature ranges and maximum air cooler speeds.

5. The method for operating the refrigeration system of the refrigerated range hood according to any one of claims 1 to 3, characterized in that: When determining the minimum speed Smin of the evaporative air cooler, if n < N1 (where N1 is the first smoke concentration threshold) and the range hood parameter d is less than the set parameter, it indicates that the cooking smoke is relatively low and the range hood airflow is relatively low; therefore, the minimum speed Smin of the evaporative air cooler is set to S4. If n < N1 and the range hood parameter d is greater than or equal to the set parameter, it indicates that the cooking smoke is relatively low and the range hood airflow is relatively high; therefore, the minimum speed Smin of the evaporative air cooler is set to S5. If n≥N1 and the range hood parameter d is less than the set parameter, it indicates that the cooking fumes are large and the range hood fan volume is small. The minimum speed of the evaporative air cooler is set to Smin=S6 accordingly. If n≥N1 and the range hood parameter d is greater than or equal to the set parameter, it indicates that the cooking fumes are large and the range hood fan volume is large. The minimum speed of the evaporative air cooler is set to Smin=S7 accordingly. S4, S5, S6, and S7 are all preset speed values, and S4>S5>S6>S7.

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