Refrigeration type range hood and control method thereof

Abstract

A refrigerated range hood and a control method thereof include a housing and a range hood fan. A smoke exhaust pipe is mounted on the top of the housing. An air outlet passage is provided within the housing, isolated from the internal flue. A vortex tube and a three-way air inlet valve are provided outside the housing. A first air inlet of the three-way air inlet valve is externally connected to an outdoor air inlet pipe, a second air inlet is connected to the smoke exhaust pipe, and an air outlet is connected to the inlet of the vortex tube. The cold-end air outlet of the vortex tube is fluidically connected to the air outlet passage, while the hot-end air outlet of the vortex tube is fluidically connected to the smoke exhaust pipe. The refrigerated range hood is configured such that low-temperature airflow discharged from the cold-end air outlet of the vortex tube enters the air outlet passage. When the range hood is in operation, the high back pressure gas from the range hood is utilized for cooling. When the range hood is not in use, air can be delivered to the vortex tube by an air pump connected to the external air duct, thereby achieving cooling. Furthermore, high-temperature airflow discharged from the hot-end air outlet of the vortex tube can be discharged into the smoke exhaust pipe.

Description

Technical Field

[0001] The present invention relates to a range hood, and in particular to a refrigeration-type range hood and a control method thereof. Background Art

[0002] As living standards improve, people's expectations for kitchen environments are becoming increasingly stringent. Cooking with stoves generates significant heat, raising the overall kitchen temperature and reducing comfort. Currently, most households resort to adding temporary fans to address this issue. However, this approach is inconvenient and takes up space in the kitchen. To address this issue, various air-conditioning range hood designs are available in the prior art. These incorporate air conditioning components into the range hood platform, achieving both the functions of a range hood and those of an air conditioner. Typically, a refrigeration module is added to the range hood to deliver cool air to the kitchen, improving environmental comfort. Existing refrigeration modules employ either semiconductor refrigeration or a refrigeration cycle consisting of a compressor, evaporator, and condenser. Compression refrigeration consumes additional energy, is noisy, and has many moving parts that are prone to failure. Semiconductor refrigeration, on the other hand, presents challenges such as low power consumption, high power consumption, high power requirements, and electrical safety risks. Consequently, further improvements to existing air-conditioning range hoods are needed. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide a refrigeration-type range hood that can utilize oil fume gas or external air to achieve cooling in response to the above-mentioned existing technical status.

[0004] The second technical problem to be solved by this statement is to provide a control method for a refrigeration range hood that can switch between a refrigeration mode and an impeller self-cleaning mode in response to the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: the refrigeration type range hood includes a casing and a range fume fan installed inside the casing, and a smoke exhaust pipe connected to the range fume fan outlet is installed on the top of the casing, which is characterized in that: an air outlet channel isolated from the internal flue of the casing is provided inside the casing, and a vortex tube and an air inlet three-way valve are provided outside the casing, and the air inlet three-way valve has a first air inlet, a second air inlet and an air outlet, the first air inlet is connected to the outdoor air inlet pipe, the second air inlet is connected to the smoke exhaust pipe, the air outlet is connected to the inlet of the vortex tube, the cold end air outlet of the vortex tube is fluidically connected to the air outlet channel, and the hot end air outlet of the vortex tube is fluidically connected to the smoke exhaust pipe.

[0006] To utilize the heat from the hot end of the vortex tube, a heating water tank and a high-temperature water tank are installed outside the housing. A high-temperature airflow pipe is also connected to the hot end outlet of the vortex tube. This high-temperature airflow pipe is coiled around the heating water tank, and its exhaust end extends into the high-temperature water tank. The heating water tank and the high-temperature water tank are connected via a drain pipe. A nozzle is connected to the outlet of the high-temperature water tank, which extends into the volute of the range hood fan. This allows the heat from the hot end of the vortex tube to clean the volute and impeller, achieving self-cleaning of the range hood fan.

[0007] In order to divide the high-temperature airflow discharged from the hot-end air outlet of the vortex tube into two paths, the hot-end air outlet of the vortex tube is installed with an exhaust three-way valve, and the exhaust three-way valve has an air inlet, a first air outlet and a second air outlet. The hot-end air outlet of the vortex tube is connected to the air inlet, the first air outlet is connected to the smoke exhaust pipe, and the second air outlet is connected to the high-temperature airflow pipe.

[0008] In order to prevent the high-temperature gas discharged from the vortex tube from flowing back to the vortex tube inlet, a flue check valve is installed in the exhaust pipe, and the exhaust pipe air inlet connected to the first exhaust port is arranged downstream of the flue check valve along the direction of oil smoke flow.

[0009] In order to filter the oil smoke in the exhaust pipe, a filter module is installed in the exhaust pipe. Along the flow direction of the oil smoke, the filter module is arranged upstream of the flue check valve.

[0010] In order to detect the water temperature in the heating water tank, a temperature sensor is installed in the heating water tank.

[0011] Further preferably, the vortex tube, the heating water tank and the high-temperature water tank are arranged on the top of the casing.

[0012] To ensure effective indoor cooling, an air compressor is installed on the outdoor air inlet pipe, and a booster pump is installed in the pipe between the exhaust pipe and the second air inlet. The compressor increases the air velocity introduced by the outdoor air inlet pipe, and the booster pump ensures that even when the range hood has low air volume, the air at the vortex tube inlet has sufficient velocity.

[0013] In order to enable the air outlet channel to blow out cold air smoothly, an air outlet fan is installed at the outlet of the air outlet channel, and a cold air outlet connected to the outlet of the air outlet fan is opened on the casing.

[0014] To enhance cooking comfort, the air outlet duct is located in front of the range hood fan. The exhaust fan is a cross-flow fan arranged horizontally at the bottom of the air outlet duct. The cold air outlet is a strip-shaped air outlet arranged horizontally at the lower front of the housing. This allows the cold air from the strip-shaped air outlet to blow towards the cook's face, providing a better user experience.

[0015] In order to detect the outlet air temperature, a temperature sensor for detecting the temperature of air blown out of the cold air outlet is installed at the cold air outlet.

[0016] The second technical problem to be solved by this statement is that, in response to the above-mentioned existing technical status, the control method of the refrigeration range hood includes the following steps:

[0017] Step A1: System startup self-test;

[0018] Step A2: Determine whether it is cooling mode or self-cleaning mode.

[0019] If it is neither cooling mode nor self-cleaning mode, the oil smoke will be discharged to the outside through the exhaust pipe;

[0020] If it is cooling mode, go to step B;

[0021] If it is in self-cleaning mode, go to step C.

[0022] There may be multiple different steps in the cooling mode. Preferably, a flue check valve is installed in the exhaust pipe of the refrigeration range hood, a crossflow fan is installed at the outlet of the air outlet channel, a temperature sensor is installed at the outlet of the air outlet channel, an air compressor is installed on the outdoor air inlet pipe, and a booster pump is installed on the pipeline between the exhaust pipe and the second air inlet of the air inlet three-way valve. Step B includes the following steps:

[0023] B1. Determine whether the range hood fan is turned on;

[0024] If it is open, the flue check valve is closed, the crossflow fan is turned on, the temperature sensor is turned on, and then the process goes to step B2;

[0025] If closed, the outdoor air inlet pipe is opened, the air compressor is turned on, and then the process goes to step B3;

[0026] B2, detect the ratio k of the outlet air temperature t1 to the set temperature t2;

[0027] If k>1, the booster pump is started. If the booster pump is already started, the booster pump speed is increased, and then the process returns to the judgment logic of step B2;

[0028] If k=1, the current booster pump speed is maintained, or the booster pump is stopped, and the current flue check valve angle is maintained;

[0029] If k < 1, the flue check valve is opened to a certain angle, and then the process returns to the judgment logic of step B2;

[0030] B3. Open the outdoor air inlet pipe and the air compressor;

[0031] B4. Detect the ratio k of the outlet air temperature t1 to the set temperature t2 of the outlet air duct;

[0032] If k>1, the air pump increases the current to increase the speed, and then returns to the judgment logic of step B4;

[0033] If k=1, the air pump maintains the current speed;

[0034] If k < 1, the air pump reduces its speed and then returns to the judgment logic of step B4.

[0035] There may be multiple steps in the self-cleaning mode. Preferably, step C includes the following steps:

[0036] C1. The range hood fan drives the impeller to rotate forward and reverse, the flue check valve is closed, and the high-temperature airflow discharged from the hot end outlet of the vortex tube is introduced into the high-temperature airflow pipe through the exhaust three-way valve;

[0037] C2, detect t3, t4 and Tmax, where t3 is the water temperature of the heating water tank, t4 is the cleaning set temperature, and Tmax is the maximum water temperature;

[0038] If t3>Tmax, the air pump reduces its speed, the one-way valve between the heating water tank and the high-temperature water tank opens, and then the process returns to the judgment logic of step C2;

[0039] If Tmax≥t3≥t4, the air pump maintains the current speed and the one-way valve between the heating water tank and the high-temperature water tank opens;

[0040] If t3 < t4, the one-way valve is closed, the air pump increases its speed, and then the process returns to the judgment logic of step C2.

[0041] Compared with the prior art, the advantages of the present invention are that: the refrigeration type range hood is provided with a vortex tube and an air inlet three-way valve on the outside of the casing; the first air inlet of the air inlet three-way valve is connected to the outdoor air inlet duct, the second air inlet is connected to the smoke exhaust duct, and the air outlet is connected to the inlet of the vortex tube; the low-temperature airflow discharged from the cold end outlet of the vortex tube enters the air outlet channel; the high back pressure gas of the range hood can be used for cooling when the range hood is turned on; and when the range hood is not in use, the air pump connected to the external air duct can be used to transport gas to the vortex tube to achieve indoor air cooling; in addition, the high-temperature airflow discharged from the hot end outlet of the vortex tube can be discharged into the smoke exhaust duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a structural diagram of a range hood according to an embodiment of the present invention;

[0043] Figure 2 for Figure 1 The structural diagram of the range hood shown;

[0044] Figure 3 for Figure 1 Schematic diagram of the internal structure of the range hood shown;

[0045] Figure 4 A cross-sectional view of the structure of a smoke exhaust pipe according to an embodiment of the present invention;

[0046] Figure 5 This is a control logic diagram of a control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0048] like Figures 1 to 3 As shown, the refrigerated range hood of this embodiment includes a housing 1, within which a range fume blower 2 is mounted. A fume exhaust duct 3, connected to the outlet of the range fume blower 2, is mounted on the top of the housing 1. The housing 1 includes a flue and an air outlet duct 4, each isolated from the other. Fumes drawn in by the range fume blower 2 are discharged into the exhaust duct 3 through the flue. An air outlet fan is mounted at the outlet of the air outlet duct 4. A cold air outlet 100, connected to the outlet of the air outlet fan, is formed in the housing 1. In this embodiment, the air outlet duct 4 is located in front of the range fume blower 1. The air outlet fan is a crossflow blower 5 arranged horizontally at the bottom of the air outlet duct 4. The cold air outlet 100 is a strip-shaped air outlet arranged horizontally at the lower front portion of the housing 1. The air outlet duct 4 forms an air flow reduction box, enabling flexible air delivery. Furthermore, a temperature sensor (not shown) is installed at the cold air outlet to detect the temperature of the air blowing out of the cold air outlet 100.

[0049] A vortex tube 6 and an air inlet three-way valve (not shown) are provided at the top of the housing 1. The air inlet three-way valve has a first air inlet, a second air inlet, and an air outlet. The first air inlet is connected to an outdoor air inlet duct 7, and an air compressor 8 is installed on the outdoor air inlet duct 7. The second air inlet is connected to the smoke exhaust duct 3, and a booster pump 9 is installed on the pipeline between the smoke exhaust duct 3 and the second air inlet. The use of the air compressor 8 and the booster pump 9 can ensure that the gas at the inlet of the vortex tube 6 has sufficient speed, thereby ensuring the indoor cooling effect. The air outlet is connected to the inlet of the vortex tube 6, the cold end air outlet 61 of the vortex tube 6 is in fluid communication with the air outlet channel 4, and the hot end air outlet 62 of the vortex tube 6 is in fluid communication with the smoke exhaust duct 3.

[0050] In addition, a heating water tank 10 and a high-temperature water tank 11 are mounted on the top of the housing 1. The heating water tank 10 and the high-temperature water tank 11 are connected via a drain pipe 12. A one-way valve (not shown) allows hot water to flow only from the heating water tank 10 into the high-temperature water tank 11. A temperature sensor (not shown) is mounted in the heating water tank 10 to detect the water temperature in the heating water tank 10. The hot end air outlet 62 of the vortex tube 6 is externally connected to a high-temperature airflow pipe 13. The high-temperature airflow pipe 13 is coiled around the heating water tank 10 to heat the water in the heating water tank 10. The exhaust end of the high-temperature airflow pipe 13 extends into the high-temperature water tank 11. The outlet of the high-temperature water tank 11 is externally connected to a nozzle 14, which extends into the volute of the range hood fan 2.

[0051] In addition, in order to divert or switch the air duct at the hot end air outlet 62 of the vortex tube 6, an exhaust three-way valve (not shown) is installed at the hot end air outlet 62 of the vortex tube 6. The exhaust three-way valve has an air inlet, a first air outlet, and a second air outlet. The hot end air outlet 62 of the vortex tube 6 is connected to the air inlet, the first air outlet is connected to the smoke exhaust pipe 3, and the second air outlet is connected to the high-temperature air flow pipe 13. The high-temperature airflow discharged from the hot end air outlet 62 can be discharged into the smoke exhaust pipe 3 and discharged outward along with the oil smoke, or it can be discharged into the high-temperature air flow pipe 13 to heat the water in the heating water tank 10. When the water temperature rises to a certain temperature, the water tank one-way valve opens, and the hot water in the heating water tank 10 flows into the high-temperature water tank 11. Finally, it is sprayed into the volute of the range hood fan 2 through the nozzle 14, impacting the impeller and self-cleaning the impeller.

[0052] like Figure 4 As shown, a flue check valve 15 is installed in the exhaust pipe 3. The exhaust pipe air inlet, which is connected to the first exhaust port of the exhaust three-way valve, is located downstream of the flue check valve 15 along the direction of oil fume flow. This prevents the high-temperature gas discharged from the vortex tube 6 from flowing back to the inlet of the vortex tube 6. A filter module 16 is also installed in the exhaust pipe 3, upstream of the flue check valve 15 along the direction of oil fume flow. The filter module 16 filters the oil fume in the exhaust pipe 3.

[0053] like Figure 5 As shown, the control method of the refrigeration type range hood includes the following steps:

[0054] Step A1: System startup self-test;

[0055] Step A2: Determine whether it is cooling mode or self-cleaning mode.

[0056] If it is neither cooling mode nor self-cleaning mode, the smoke is discharged to the outside through the exhaust pipe 3;

[0057] If it is cooling mode, go to step B;

[0058] If it is in self-cleaning mode, go to step C.

[0059] Step B in the cooling mode specifically includes the following steps:

[0060] B1. Determine whether the range hood fan 2 is turned on;

[0061] If it is open, the flue check valve 15 is closed, the crossflow fan 5 is turned on, the temperature sensor is turned on, and then the process goes to step B2;

[0062] If closed, the outdoor air inlet pipe 7 is opened, the air pump 8 is turned on, and then the process goes to step B3;

[0063] B2, detect the ratio k of the outlet air temperature t1 to the set temperature t2;

[0064] If k>1, the booster pump 9 is started. If the booster pump 9 is already started, the speed of the booster pump 9 is increased, and then the process returns to the judgment logic of step B2;

[0065] If k=1, the speed of the existing booster pump 9 is maintained, or the booster pump 9 is stopped, and the angle of the existing flue check valve 15 is maintained;

[0066] If k < 1, the flue check valve 15 is opened to a certain angle, and then the process returns to the judgment logic of step B2;

[0067] B3, open the outdoor air inlet pipe 7 and the air compressor 8;

[0068] B4. Detect the ratio k of the outlet air temperature t1 and the set temperature t2 of the outlet air channel 4;

[0069] If k>1, the air pump 8 increases the current to increase the speed, and then returns to the judgment logic of step B4;

[0070] If k=1, the air pump 8 maintains the current speed;

[0071] If k<1, the air pump 8 reduces its rotation speed and then returns to the judgment logic of step B4.

[0072] Step C in the self-cleaning mode includes the following steps:

[0073] C1. The range hood fan 2 drives the impeller to rotate forward and reverse, the flue check valve 15 is closed, and the high-temperature airflow discharged from the hot end outlet 62 of the vortex tube 6 is introduced into the high-temperature airflow pipe 13 through the exhaust three-way valve;

[0074] C2, detecting t3, t4 and Tmax, where t3 is the water temperature of the heating water tank 10, t4 is the cleaning set temperature, and Tmax is the maximum water temperature;

[0075] If t3>Tmax, the air pump 8 reduces its speed, the one-way valve between the heating water tank 10 and the high-temperature water tank 11 opens, and then the process returns to the judgment logic of step C2;

[0076] If Tmax≥t3≥t4, the air pump 8 maintains the current speed, and the one-way valve between the heating water tank 10 and the high-temperature water tank 11 opens;

[0077] If t3<t4, the one-way valve is closed, the air pump 8 increases its speed, and then the process returns to the judgment logic of step C2.

Claims

1. A refrigeration-type range hood comprising a housing and a range hood fan installed inside the housing, with a smoke exhaust pipe connected to the outlet of the range hood fan installed on the top of the housing, characterized in that: An air outlet channel isolated from the internal flue of the casing is provided inside the casing, and a vortex tube and an air inlet three-way valve are provided outside the casing. The air inlet three-way valve has a first air inlet, a second air inlet and an air outlet. The first air inlet is externally connected to the outdoor air inlet pipe, the second air inlet is connected to the smoke exhaust pipe, the air outlet is connected to the inlet of the vortex tube, the cold end air outlet of the vortex tube is fluidically connected to the air outlet channel, and the hot end air outlet of the vortex tube is fluidically connected to the smoke exhaust pipe.

2. The refrigeration-type range hood according to claim 1, characterized in that: A heating water tank and a high-temperature water tank are installed on the outside of the casing. The hot end air outlet of the vortex tube is also externally connected to a high-temperature airflow pipe. The high-temperature airflow pipe is coiled on the heating water tank, and the exhaust end of the high-temperature airflow pipe extends into the high-temperature water tank. The heating water tank and the high-temperature water tank are connected through a drainage pipe. The outlet of the high-temperature water tank is externally connected to a nozzle, and the nozzle extends into the interior of the volute of the range hood fan.

3. The refrigeration-type range hood according to claim 2, characterized in that: The hot end air outlet of the vortex tube is installed with an exhaust three-way valve, and the exhaust three-way valve has an air inlet, a first air outlet and a second air outlet. The hot end air outlet of the vortex tube is connected to the air inlet, the first air outlet is connected to the smoke exhaust pipe, and the second air outlet is connected to the high-temperature air flow pipe.

4. The refrigeration-type range hood according to claim 3, characterized in that: A flue check valve is installed in the smoke exhaust pipe, and along the flow direction of the oil smoke, the smoke exhaust pipe air inlet connected with the first air outlet is arranged downstream of the flue check valve.

5. The refrigeration-type range hood according to claim 4, characterized in that: A filter module is installed in the smoke exhaust pipe. Along the flow direction of the oil smoke, the filter module is arranged upstream of the flue check valve.

6. The refrigeration-type range hood according to claim 2, characterized in that: A temperature sensor is installed in the heating water tank.

7. The refrigeration-type range hood according to claim 2, characterized in that: The vortex tube, the heating water tank and the high-temperature water tank are arranged on the top of the casing.

8. The refrigeration-type range hood according to claim 2, characterized in that: An air compressor is installed on the outdoor air inlet pipe, and a booster pump is installed on the pipeline between the smoke exhaust pipe and the second air inlet.

9. The refrigeration-type range hood according to claim 2, characterized in that: An air outlet fan is installed at the outlet of the air outlet channel, and a cold air outlet connected to the outlet of the air outlet fan is opened on the casing.

10. The refrigeration-type range hood according to claim 9, characterized in that: The air outlet channel is arranged at the front side of the range fumes suction fan, the air outlet fan is a cross-flow fan arranged horizontally at the bottom of the air outlet channel, and the cold air outlet is a strip-shaped air outlet arranged horizontally at the lower part of the front side of the casing.

11. The refrigeration-type range hood according to claim 10, characterized in that: A temperature sensor for detecting the temperature of air blown out of the cold air outlet is installed at the cold air outlet.

12. A control method for a refrigeration-type range hood, characterized in that: The control method is implemented by the refrigeration range hood according to any one of claims 2 to 11, and the control method comprises the following steps: Step A1: System startup self-test; Step A2: Determine whether it is cooling mode or self-cleaning mode. If it is neither cooling mode nor self-cleaning mode, the oil smoke will be discharged to the outside through the exhaust pipe; If it is cooling mode, go to step B; If it is in self-cleaning mode, go to step C.

13. The control method of the refrigeration-type range hood according to claim 12, characterized in that: The exhaust pipe of the refrigeration range hood is equipped with a flue check valve, the outlet of the air outlet channel is equipped with a crossflow fan, the outlet of the air outlet channel is equipped with a temperature sensor, the outdoor air inlet pipe is equipped with an air compressor pump, and the pipeline between the exhaust pipe and the second air inlet of the air inlet three-way valve is equipped with a booster pump. Step B includes the following steps: B1. Determine whether the range hood fan is turned on; If it is open, the flue check valve is closed, the crossflow fan is turned on, the temperature sensor is turned on, and then the process goes to step B2; If closed, the outdoor air inlet pipe is opened, the air compressor is turned on, and then the process goes to step B3; B2, detect the ratio k of the outlet air temperature t1 to the set temperature t2; If k>1, the booster pump is started. If the booster pump is already started, the booster pump speed is increased, and then the process returns to the judgment logic of step B2; If k=1, the current booster pump speed is maintained, or the booster pump is stopped, and the current flue check valve angle is maintained; If k < 1, the flue check valve is opened to a certain angle, and then the process returns to the judgment logic of step B2; B3. Open the outdoor air inlet pipe and the air compressor; B4. Detect the ratio k of the outlet air temperature t1 to the set temperature t2 of the outlet air duct; If k>1, the air pump increases the current to increase the speed, and then returns to the judgment logic of step B4; If k=1, the air pump maintains the current speed; If k < 1, the air pump reduces its speed and then returns to the judgment logic of step B4.

14. The control method of a refrigeration-type range hood according to claim 12, characterized in that: Described step C comprises the following steps: C1. The range hood fan drives the impeller to rotate forward and reverse, the flue check valve is closed, and the high-temperature airflow discharged from the hot end outlet of the vortex tube is introduced into the high-temperature airflow pipe through the exhaust three-way valve; C2, detect t3, t4 and Tmax, where t3 is the water temperature of the heating water tank, t4 is the cleaning set temperature, and Tmax is the maximum water temperature; If t3>Tmax, the air pump reduces its speed, the one-way valve between the heating water tank and the high-temperature water tank opens, and then the process returns to the judgment logic of step C2; If Tmax≥t3≥t4, the air pump maintains the current speed and the one-way valve between the heating water tank and the high-temperature water tank opens; If t3 < t4, the one-way valve is closed, the air pump increases its speed, and then the process returns to the judgment logic of step C2.

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