A central flue system and its control method

Abstract

A central flue system and its control method include range hoods installed on different floors. Each range hood includes a fume extraction module, a compressor, a heat dissipation module, and an indoor unit module. The fume extraction module includes a fume extraction fan, and the fan's outlet is connected to a common flue via a flue pipe. The heat dissipation module includes a condenser and a cooling fan. The indoor unit module includes an evaporator and an indoor unit fan. Ventilation openings are formed in the volute wall of the fume extraction fan, and the cooling fan's outlet is in fluid communication with the interior of the volute through these openings. A pressure sensor for detecting the back pressure of the common flue is installed at the outlet of each range hood's flue pipe. The controller receives the output signal from the corresponding pressure sensor and adjusts the speed of the cooling fan accordingly. The controller of this central flue system can automatically adjust the cooling fan speed based on the back pressure of the corresponding common flue, the condenser temperature, and whether the fume sensor alarms, demonstrating a high degree of intelligence.

Description

Technical Field

[0001] This invention relates to central flue systems, and more particularly to a central flue system and its control method. Background Technology

[0002] Currently, newly built urban residential buildings are generally getting taller and taller, and are mostly equipped with high-end interior decoration. High-rise residential buildings mostly use indoor range hoods, flues, check valves, and shared flues connected together. This allows kitchen fumes to be exhausted from the indoor range hoods through the flues into the shared flue. Since the outlet of the shared flue in high-rise buildings is usually located at the top, the operation of the user's range hood affects the system's outlet resistance. Increased flue distance leads to increased friction loss, and exhaust from upstairs range hoods increases exhaust resistance on downstairs, resulting in extremely uneven pressure distribution within the shared flue. Generally, higher floors have better exhaust performance, while lower floors have higher pressure and poorer exhaust performance, especially during peak cooking times. However, the cross-sectional area of ​​the shared flue is generally defined by building design codes. Increasing the airflow without increasing the flue area can lead to flue blockage, increasing the flow velocity and noise of the entire flue system.

[0003] Traditional range hoods typically only have two modes: low and high. Residents on the second floor often use the high setting due to the higher resistance in the shared exhaust duct, as do residents on the 15th floor, who are in the middle. However, compared to residents on the second floor, the resistance in the shared exhaust duct for residents on the 15th floor is much lower. Therefore, residents on the 15th floor can use a lower setting (below the high setting) to achieve effective smoke extraction while reducing fan speed and noise for a better user experience. For example, some central exhaust systems have pressure sensors at the exhaust outlet of each household's duct. These sensors detect the back pressure resistance in the shared exhaust duct. To balance effective smoke extraction and user noise levels, a cruise mode is implemented. The pressure sensors on each floor detect the back pressure in the shared exhaust duct and automatically adjust the fan speed accordingly, maintaining the lowest speed while ensuring effective smoke extraction. For a 30-story building, floors 1-10, 11-20, and 21-30 can all be set to the same mode, with pressure sensors placed on floors 1, 11, and 21 respectively. For floors 1-10, the highest noise level is activated based on the worst-case scenario for the user on floor 1. Floors 1-20 are then in medium-speed mode, based on the worst-case scenario for the user on floor 11. This significantly reduces noise compared to users manually setting the highest setting. For floors 21-30, the lowest noise level is activated based on the worst-case scenario for the user on floor 21. This control method for the central flue system effectively reduces noise and improves the efficiency of the range hoods, and is generally applicable to various central flue systems. However, for central flue systems where each floor has a refrigerated range hood, further improvements to the control method are needed. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a central flue system that can intelligently adjust the air volume of the cooling fan according to the back pressure of the public flue, in light of the above-mentioned existing technology.

[0005] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned central flue system in view of the current state of the prior art.

[0006] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: The central flue system includes range hoods installed on different floors. Each range hood includes a fume extraction module, a compressor, a heat dissipation module, and an indoor unit module. The fume extraction module includes a fume extraction fan, and the outlet of the fume extraction fan is connected to the common flue through a flue pipe. The heat dissipation module includes a condenser and a heat dissipation fan. The indoor unit module includes an evaporator and an indoor unit fan. The compressor, condenser, and evaporator are connected through refrigerant pipes. The feature is that the volute ring wall of the fume extraction fan has a ventilation opening, and the outlet of the heat dissipation fan can be fluidly connected to the inside of the volute through the ventilation opening. A pressure sensor for detecting the back pressure of the common flue is installed at the outlet of the flue pipe of each range hood. Each range hood also includes a controller, which can receive the output signal of the corresponding pressure sensor and adjust the speed of the heat dissipation fan accordingly based on the received signal.

[0007] Preferably, the controller can adjust the speed of the cooling fan and the fume extractor fan according to the output signal received from the pressure sensor.

[0008] To enhance the intelligence of the central flue system, it also includes temperature and fume sensors. The temperature sensor is mounted on the condenser surface to detect the condenser temperature, while the fume sensor is installed at the air outlet of the cooling fan. The controller receives the output signals from the temperature and fume sensors and adjusts the speed of the cooling and fume extraction fans accordingly. This configuration allows for precise adjustment of the airflow of the cooling and fume extraction fans based on the condenser temperature and whether fumes are flowing back into the cooling fan, resulting in a high degree of intelligence.

[0009] To improve air intake efficiency, the vent is located at the front section of the volute ring wall and close to the root of the volute tongue of the fume extractor.

[0010] In order to effectively guide the air blown out by the cooling fan into the fume extractor, an air guide cover is installed at the vent.

[0011] To fully utilize the condensate from the air conditioner, a water collection box is installed inside the range hood to collect the condensate that forms on the evaporator surface. The condensate in the collection box can be transported to the condenser and / or the interior of the cooling fan. The condensate can be used to cool the condenser or transported to the cooling fan. Inside the cooling fan, the condensate cools the fan and then enters the range hood through its outlet, ultimately being discharged outwards.

[0012] The fume extractor and the cooling fan can be arranged in various ways. Preferably, both the fume extractor and the cooling fan are centrifugal fans, and the impeller central axis of the fume extractor and the impeller central axis of the cooling fan are parallel to each other.

[0013] In order to allow the air blown out by the cooling fan to smoothly enter the kitchen exhaust fan, the cooling fan is located above the kitchen exhaust fan, and the air outlet of the cooling fan faces the ventilation opening.

[0014] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a control method for a central flue system, characterized in that: the control method divides the floors into low-floor intervals, middle-floor intervals and high-floor intervals, adjusts the speed of the cooling fan and the fume extraction fan according to the back pressure of the public flue corresponding to the lowest floor in different floor intervals, adjusts the speed of the cooling fan according to the temperature of the condenser, and increases the speed of the cooling fan when the fume sensor alarms.

[0015] Further preferred, the control method for the central flue system includes the following steps:

[0016] S1. The range hood enters air conditioning mode;

[0017] S2. Determine whether the back pressure P of the common flue corresponding to the lowest floor range hood in the low floor interval, middle floor interval and high floor interval satisfies P>P2;

[0018] If so, proceed to step S3.

[0019] If not, proceed to step S4;

[0020] S3. The range hood fan for the corresponding floor area is turned on at high speed, the corresponding cooling fan is turned on at low speed, and the indoor unit fan is turned on according to the user's air conditioner mode. Then proceed to step S7.

[0021] S4. Determine whether the back pressure P of the common flue of the range hood on the lowest floor in the low-floor, middle-floor, and high-floor intervals satisfies P1<P≤P2.

[0022] If so, proceed to step S5.

[0023] If not, proceed to step S6;

[0024] S5. The range hood fan for the corresponding floor area is turned on at medium speed, the corresponding cooling fan is turned on at medium speed, and the indoor unit fan is turned on according to the user's air conditioner setting mode. Then proceed to step S8.

[0025] S6. The range hood fan for the corresponding floor area is turned on at a low speed, the corresponding cooling fan is turned on at a high speed, and the indoor unit fan is turned on according to the user's air conditioner setting. Then proceed to step S9.

[0026] S7. Determine whether the condenser temperature T satisfies the condition T < T1.

[0027] If T < T1, then reduce the cooling fan speed, and then determine whether the condenser temperature T satisfies T > T2, or whether the oil fume sensor alarms. If yes, then increase the cooling fan speed; if no, then reduce the cooling fan speed, where T2 > T1.

[0028] If T < T1 is not satisfied, return to step S3;

[0029] S8. Determine whether the condenser temperature T satisfies the condition T < T1.

[0030] If T < T1, then reduce the cooling fan speed and then check if the condenser temperature T meets the condition T > T2, or check if the oil fume sensor alarms. If yes, then increase the cooling fan speed; otherwise, reduce the cooling fan speed.

[0031] If T < T1 is not satisfied, return to step S5;

[0032] S9. Determine whether the condenser temperature T satisfies the condition T < T1.

[0033] If T < T1, then reduce the cooling fan speed and then check if the condenser temperature T meets the condition T > T2, or check if the oil fume sensor alarms. If yes, then increase the cooling fan speed; otherwise, reduce the cooling fan speed.

[0034] If T < T1 is not satisfied, return to step S6.

[0035] Compared with the prior art, the advantages of this invention are as follows: the central flue system is equipped with a refrigerated range hood on each different floor. The refrigerated range hood includes a fume extraction module, a compressor, a heat dissipation module, and an indoor unit module. The air outlet of the heat dissipation fan can be fluidly connected to the inside of the volute through the ventilation holes on the volute ring wall. The back pressure of each range hood is detected by a pressure sensor. The controller can receive the output signal of the corresponding pressure sensor and adjust the speed of the heat dissipation fan accordingly. That is, the speed of the heat dissipation fan can be adaptively adjusted according to the back pressure. This control method can also automatically adjust the speed of the heat dissipation fan according to the condenser temperature and whether the fume sensor alarms, which has a high degree of intelligence. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a range hood according to an embodiment of the present invention;

[0037] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the range hood.

[0038] Figure 3 This is a schematic diagram of the central flue system according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the air conditioning component connection of the range hood according to an embodiment of the present invention;

[0040] Figure 5 This is a flowchart of the control method for the central flue system according to an embodiment of the present invention. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0042] like Figures 1 to 4 As shown, the central flue system in this embodiment includes range hoods 1 installed on different floors. Each range hood 1 is a refrigerated range hood, comprising a fume extraction module 11, a compressor 12, a heat dissipation module 13, and an indoor unit module 14. The fume extraction module 11 includes a fume extraction fan 111, the outlet of which is connected to the common flue 2 via a flue pipe. The heat dissipation module 13 includes a condenser 131 and a heat dissipation fan 132. The indoor unit module 14 includes an evaporator 141 and an indoor unit fan 142. The compressor 12, condenser 131, and evaporator 141 are connected via refrigerant piping 15. The compressor 12, condenser 131, and evaporator 141 constitute an air conditioning assembly, the working principle of which is the same as that of existing air conditioning systems and will not be described further here.

[0043] The range hood fan 111 has a vent 113 on its volute annular wall 112. The outlet of the cooling fan 132 can communicate with the interior of the volute through the vent 113. In this embodiment, the vent 113 is located at the front of the volute annular wall 112 and near the root of the volute tongue 114 of the range hood fan 111. A guide cover 115 is installed on the vent 113. Both the range hood fan 111 and the cooling fan 132 are centrifugal fans, and the impeller central axis of the range hood fan 111 is parallel to the impeller central axis of the cooling fan 132. The cooling fan 132 is located above the range hood fan 111, and its outlet faces the vent 113. The cooling fan 132 is used to dissipate heat from the condenser 131, and the hot air blown out by the cooling fan 132 enters the interior of the range hood fan 111 through the vent 113.

[0044] A water collection box 18 is installed inside the range hood 1 to collect condensate water condensed on the surface of the evaporator 141. The condensate water in the water collection box 18 can be transported to the condenser 131 and / or the interior of the cooling fan 132. The condensate water can be used to cool the condenser 131 or transported to the cooling fan 132. The condensate water enters the cooling fan 132, cooling it on one hand, and then enters the range hood 111 through the air outlet of the cooling fan 132, and is finally discharged outwards.

[0045] A pressure sensor for detecting back pressure in the common flue 2 is installed at the exhaust outlet of each range hood 1. Each range hood 1 has a controller that receives the output signal from the corresponding pressure sensor and adjusts the speed of the cooling fan 132 and the exhaust fan 111 accordingly. Under conditions of high back pressure, the speed of the exhaust fan 111 is typically increased, while the speed of the cooling fan 132 is decreased.

[0046] In addition, a temperature sensor 16 is installed on the surface of the condenser 131 to detect its temperature, and an oil fume sensor 17 is installed at the air outlet of the cooling fan 132. When oil fumes from the exhaust fan 111 flow back into the cooling fan 132 through the vent 113, the oil fume sensor 17 sends an alarm signal to the controller. The controller can receive the output signals from the temperature sensor 16 and the oil fume sensor 17 and adjust the speed of the cooling fan 132 and the exhaust fan 111 according to the received signals.

[0047] like Figure 5 As shown, the control method of the central flue system in this embodiment divides the floors into low-floor, middle-floor, and high-floor sections. The speed of the cooling fan 132 and the fume extractor 111 is adjusted according to the back pressure of the lowest floor in each section's common flue 2. The speed of the cooling fan 132 is also adjusted according to the temperature of the condenser 131. Furthermore, the speed of the cooling fan 132 is increased when the fume sensor 17 alarms. Specifically, the following steps are included:

[0048] S1, Range Hood 1 enters air conditioning mode;

[0049] S2. Determine whether the back pressure P of the common flue 2 corresponding to the lowest floor range hood 1 in the low floor interval, middle floor interval and high floor interval satisfies P>P2;

[0050] If so, proceed to step S3.

[0051] If not, proceed to step S4;

[0052] S3. The range hood 111 of the corresponding floor area is turned on at high speed, the corresponding cooling fan 132 is turned on at low speed, and the indoor unit fan 142 is turned on according to the user's air conditioner mode. Then proceed to step S7.

[0053] S4. Determine whether the back pressure P of the common flue 2 of the range hood 1 on the lowest floor in the low floor interval, middle floor interval and high floor interval satisfies P1<P≤P2.

[0054] If so, proceed to step S5.

[0055] If not, proceed to step S6;

[0056] S5. The range hood 111 of the corresponding floor area is turned on at medium speed, the corresponding cooling fan 132 is turned on at medium speed, and the indoor unit fan 142 is turned on according to the user's air conditioner mode. Then proceed to step S8.

[0057] S6. The range hood 111 of the corresponding floor area is turned on at a low speed, the corresponding cooling fan 132 is turned on at a high speed, and the indoor unit fan 142 is turned on according to the user's air conditioner setting mode. Then proceed to step S9.

[0058] S7. Determine whether the temperature T of condenser 131 satisfies the condition T < T1.

[0059] If T < T1, then reduce the speed of the cooling fan 132, and then determine whether the temperature T of the condenser 131 satisfies T > T2, or determine whether the oil fume sensor 17 alarms. If yes, then increase the speed of the cooling fan 132; if no, then reduce the speed of the cooling fan 132, where T2 > T1.

[0060] If T < T1 is not satisfied, return to step S3;

[0061] S8. Determine whether the temperature T of condenser 131 satisfies the condition T < T1.

[0062] If T < T1 is satisfied, then the cooling fan 132 is reduced in speed, and then it is determined whether the temperature T of the condenser 131 satisfies T > T2, or whether the oil fume sensor 17 alarms. If yes, the cooling fan 132 is increased in speed; if no, the cooling fan 132 is reduced in speed.

[0063] If T < T1 is not satisfied, return to step S5;

[0064] S9. Determine whether the temperature T of condenser 131 satisfies the condition T < T1.

[0065] If T < T1 is satisfied, then the cooling fan 132 is reduced in speed, and then it is determined whether the temperature T of the condenser 131 satisfies T > T2, or whether the oil fume sensor 17 alarms. If yes, the cooling fan 132 is increased in speed; if no, the cooling fan 132 is reduced in speed.

[0066] If T < T1 is not satisfied, return to step S6.

[0067] In this embodiment, T1 = 60℃ and T2 = 70℃.

[0068] Taking a 30-story building as an example, floors 1-10 are considered the low-rise section, floors 11-20 the middle-rise section, and floors 21-30 the high-rise section. For floors 21-30, based on the worst-case scenario for the 21st-floor user, the cooling system is set to low-power mode, with the cooling fans running at high power. For floors 11-20, based on the worst-case scenario for the 11th-floor user, a medium-power mode is used, with the cooling fans running at medium power. Compared to users manually setting the cooling system to high power, this significantly reduces noise. For floors 1-10, based on the worst-case scenario for the 1st-floor user, a high-power mode is used, with the cooling fans running at low power.

Claims

1. A central flue system, comprising range hoods (1) installed on different floors, wherein each range hood (1) includes a fume extraction module (11), a compressor (12), a heat dissipation module (13), and an indoor unit module (14), wherein the fume extraction module (11) includes a fume extraction fan (111), the outlet of which is connected to a common flue (2) via a flue pipe, the heat dissipation module (13) includes a condenser (131) and a heat dissipation fan (132), and the indoor unit module (14) includes an evaporator (141) and an indoor unit fan (142), wherein the compressor (12), the condenser (131), and the evaporator (141) are connected via a refrigerant pipe (15), characterized in that: The volute ring wall (112) of the range hood (111) has a ventilation opening (113). The air outlet of the cooling fan (132) can be fluidly connected to the inside of the volute through the ventilation opening (113). A pressure sensor for detecting the back pressure of the common flue (2) is installed at the flue outlet of each range hood (1). Each range hood (1) also includes a controller. The controller can receive the output signal of the corresponding pressure sensor and adjust the speed of the cooling fan (132) accordingly based on the received signal.

2. The central flue system according to claim 1, characterized in that: The controller can adjust the speed of the cooling fan (132) and the fume extractor fan (111) according to the output signal received from the pressure sensor.

3. The central flue system according to claim 1, characterized in that: It also includes a temperature sensor (16) and an oil fume sensor (17). The temperature sensor (16) is installed on the surface of the condenser (131) and is used to detect the temperature of the condenser (131). The oil fume sensor (17) is installed at the air outlet of the cooling fan (132). The controller can receive the output signals of the temperature sensor (16) and the oil fume sensor (17) and adjust the speed of the cooling fan (132) and the oil fume fan (111) according to the received signals.

4. The central flue system according to claim 1, characterized in that: The ventilation opening (113) is located at the front section of the volute ring wall (112) and near the root of the volute tongue (114) of the fume extractor (111).

5. The central flue system according to claim 1, characterized in that: An air guide cover (115) is installed at the vent (113).

6. The central flue system according to claim 1, characterized in that: Inside the range hood (1), there is a water collection box (18) for collecting condensate water condensed on the surface of the evaporator (141). The condensate water in the water collection box (18) can be transported to the condenser (131) and / or the interior of the cooling fan (132).

7. The central flue system according to claim 1, characterized in that: Both the fume extractor (111) and the cooling fan (132) are centrifugal fans, and the impeller center axis of the fume extractor (111) is parallel to the impeller center axis of the cooling fan (132).

8. The central flue system according to claim 1, characterized in that: The cooling fan (132) is located above the fume extractor (111), and the air outlet of the cooling fan (132) faces the ventilation opening (113).

9. A control method for a central flue system, characterized in that: The control method is applied to the central flue system of claim 3. The control method divides the floors into low floor intervals, middle floor intervals and high floor intervals. The speed of the cooling fan (132) and the oil fume fan (111) is adjusted according to the back pressure of the public flue (2) corresponding to the lowest floor in different floor intervals. The speed of the cooling fan (132) is adjusted according to the temperature of the condenser (131). The speed of the cooling fan (132) is increased when the oil fume sensor (17) is alarmed.

10. The control method for a central flue system according to claim 9, characterized in that... The control method includes the following steps: S1. The range hood (1) enters air conditioning mode; S2. Determine whether the back pressure P of the common flue (2) corresponding to the lowest floor range hood in the low floor interval, middle floor interval and high floor interval satisfies P>P2; If so, proceed to step S3. If not, proceed to step S4; S3. The range hood (111) of the corresponding floor area is turned on at high speed, the corresponding cooling fan (132) is turned on at low speed, and the indoor unit fan (142) is turned on according to the user's air conditioner mode. Then proceed to step S7. S4. Determine whether the back pressure P of the common flue (2) of the range hood (1) in the lowest floor of the low floor interval, middle floor interval and high floor interval satisfies P1<P≤P2; If so, proceed to step S5. If not, proceed to step S6; S5. The range hood (111) of the corresponding floor area is turned on at medium speed, the corresponding cooling fan (132) is turned on at medium speed, and the indoor unit fan (142) is turned on according to the user's air conditioner mode. Then proceed to step S8. S6. The range hood (111) of the corresponding floor area is turned on at a low speed, the corresponding cooling fan (132) is turned on at a high speed, and the indoor unit fan (142) is turned on according to the user's air conditioner mode. Then proceed to step S9. S7. Determine whether the temperature T of the condenser (131) satisfies the condition T < T1. If T < T1, then reduce the speed of the cooling fan (132), and then determine whether the temperature T of the condenser (131) satisfies T > T2, or determine whether the oil fume sensor (17) alarms. If yes, then increase the speed of the cooling fan (132). If no, then reduce the speed of the cooling fan (132), where T2 > T1. If T < T1 is not satisfied, return to step S3; S8. Determine whether the temperature T of the condenser (131) satisfies the condition that T < T1. If T < T1 is satisfied, the speed of the cooling fan (132) is reduced, and then it is determined whether the temperature T of the condenser (131) satisfies T > T2, or whether the oil fume sensor (17) alarms. If yes, the speed of the cooling fan (132) is increased; if no, the speed of the cooling fan (132) is reduced. If T < T1 is not satisfied, return to step S5; S9. Determine whether the temperature T of the condenser (131) satisfies the condition T < T1. If T < T1 is satisfied, the speed of the cooling fan (132) is reduced, and then it is determined whether the temperature T of the condenser (131) satisfies T > T2, or whether the oil fume sensor (17) alarms. If yes, the speed of the cooling fan (132) is increased; if no, the speed of the cooling fan (132) is reduced. If T < T1 is not satisfied, return to step S6.

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