Kitchen air conditioning system and control method thereof

Abstract

The invention discloses a kitchen air conditioning system and a control method thereof.The kitchen air conditioning system comprises an oil fume suction assembly and a fresh air assembly, the oil fume suction assembly comprises a draught fan, and the fresh air assembly comprises a fresh air inlet pipe for introducing fresh air into a kitchen; the kitchen air conditioning system further comprises a heat transfer system, and the heat transfer system comprises a first heat exchanger which is in a hollow pipeline shape, is arranged at an air outlet of the draught fan and exchanges heat with oil smoke exhausted by the oil smoke suction assembly; the second heat exchanger is in a hollow pipeline shape, is arranged on the fresh air inlet pipe and exchanges heat with air introduced by the fresh air inlet pipe; and the circulating pump can rotate forwards and reversely, so that the heat transfer working medium circularly flows among the first heat exchanger, the circulating pump and the second heat exchanger. Compared with the prior art, the air conditioner has the advantages that the heat pipe technology is utilized, the positive and negative rotation of the working medium circulation conveying pump achieves conversion of the functions of the two heat exchangers, the temperature of supplemented fresh air can be adjusted according to the environment temperature, the comfort of a user in a kitchen is improved, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to indoor air treatment technology, in particular to a kitchen air conditioning system and a control method for the kitchen air conditioning system. Background Art

[0002] With the increasing air volume of range hoods, in rainy and windy days or in weather with relatively low temperatures, when cooking, the range hood continuously sucks and discharges the air in the kitchen. If users do not open the doors and windows in time, there will be problems such as negative pressure in the kitchen, poor smoking effect, and odor backflow from the sewer. At the same time, it causes insufficient oxygen supply for the gas stove, resulting in incomplete combustion, and a large amount of harmful components in the exhaust gas emitted. If the windows are opened, the air introduced into the room in winter has a relatively low temperature, and the air introduced in summer has a relatively high temperature, resulting in a poor user experience and low energy efficiency.

[0003] To this end, it is usually alleviated by separately setting up a fresh air device. However, the existing fresh air devices are generally not suitable for cooking scenarios with a large amount of oil fume in Chinese kitchens. At the same time, they do not have a total heat exchange function suitable for kitchen scenarios, and particles such as grease in the oil fume cause a significant reduction in the service life of the fresh air device and a significant reduction in the heat exchange efficiency. The Chinese patent with the application number 202220019021.8 of the present applicant discloses a kitchen air conditioning system. A first heat exchanger is provided on the air inlet channel, and a second heat exchanger is provided at the air outlet of the range hood. When working in the cooling mode, the first heat exchanger is a condenser, and the second heat exchanger is an evaporator. Outdoor fresh air flows into the air conditioner outdoor unit from the fresh air inlet and dissipates heat from the first heat exchanger during the process of flowing to the fresh air outlet. The dissipated heat flows from the fresh air outlet to the smoke exhaust channel along with the fresh air, and the second heat exchanger uses the indoor air in the kitchen for refrigeration, and cold air is blown out from the air outlet of the air conditioner.

[0004] However, the above system uses compression refrigeration technology, which has problems such as complex structure, high failure rate, and high cost, and can only achieve refrigeration and cannot meet the use requirements in winter. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a kitchen air conditioning system that adapts to different use scenarios, improves comfort, and enhances the user experience in view of the deficiencies of the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned kitchen air conditioning system.

[0007] The technical solution adopted by the present invention to solve the above first technical problem is: A kitchen air conditioning system includes an oil fume extraction component and a fresh air component. The oil fume extraction component includes a fan, and the fresh air component includes a fresh air inlet pipe for introducing fresh air into the kitchen. It is characterized in that:

[0008] The kitchen air conditioning system further includes a heat transfer system, which includes:

[0009] The first heat exchanger is in the shape of a hollow pipe and is arranged at the air outlet of the fan to exchange heat with the oil smoke exhausted by the oil smoke suction component;

[0010] The second heat exchanger is in the shape of a hollow pipe and is installed on the fresh air inlet pipe to exchange heat with the air introduced by the fresh air inlet pipe; and

[0011] The circulating pump capable of forward and reverse rotation enables the heat transfer medium to circulate between the first heat exchanger, the circulating pump and the second heat exchanger.

[0012] By using heat pipe technology, the forward and reverse rotation of the working medium circulation delivery pump can realize the conversion of the functions of the two heat exchangers. The first heat exchanger is set on the oil smoke flow path, and the second heat exchanger is set on the fresh air flow path. When the circulation pump is reversed, the first heat exchanger acts as a condenser to release heat to the cooking smoke, and the second heat exchanger acts as an evaporator to absorb heat from the introduced fresh air, which can pre-cool the fresh air. The first heat exchanger uses the exhaust oil smoke airflow to take away its heat, and uses the large air volume of the oil smoke suction fan to achieve the ultimate heat dissipation effect, so the pre-cooling effect is good; when the circulation pump rotates forward, the first heat exchanger acts as an evaporator to take away the heat from the cooking smoke. The heat is absorbed from the flue gas, and the second heat exchanger acts as a condenser to release heat to the introduced fresh air, and the oil fume gas exhausted from cooking is used to preheat the fresh air, which is more environmentally friendly and energy-saving. In this way, the temperature of the fresh air is adjusted according to the ambient temperature, so that the fresh air is kept at a comfortable temperature, which improves the comfort of users in the kitchen and improves the user experience. The fume extraction component and the fresh air component share a fan, which has a more compact structure, saves space, saves costs, and has higher reliability. The introduction of fresh air can balance the airflow in the kitchen, solving a series of pain points in the kitchen caused by the exhaust of the range hood, such as negative pressure, poor smoking effect, and incomplete gas combustion.

[0013] Preferably, the first heat exchanger and the second heat exchanger have the same structure and both have a heat transfer medium channel, the heat transfer medium channel of the first heat exchanger has a first channel opening and a second channel opening at both ends thereof, and the heat transfer medium channel of the second heat exchanger has a third channel opening and a fourth channel opening at both ends thereof;

[0014] The first channel port of the first heat exchanger and the third channel port of the second heat exchanger are connected by a first connecting pipe made of a thermally insulating material to achieve fluid communication, and the second channel port of the first heat exchanger and the fourth channel port of the second heat exchanger are connected by a second connecting pipe made of a thermally insulating material to achieve fluid communication;

[0015] The circulation pump is arranged on the first connecting pipe or the second connecting pipe.

[0016] Thus, the first heat exchanger, the first connecting pipe, the second heat exchanger, the second connecting pipe and the circulation pump form a closed space for the transfer of the heat transfer medium, avoiding heat conduction through the pipes and thus reducing the heat transfer efficiency of the system.

[0017] Preferably, to further improve the heat dissipation efficiency, each heat exchanger includes a main body which is in the shape of a hollow pipe. The space enclosed by the main body constitutes an air flow channel for air to pass through, and the heat transfer medium channel is formed inside the wall of the main body. Thus, the heat transfer medium can directly exchange heat with the main body, with a short heat conduction path and high heat transfer efficiency.

[0018] Preferably, to ensure the heat dissipation efficiency, the main body includes two layers of heat conducting plates, and the heat transfer medium channel is formed between the two layers of heat conducting plates.

[0019] Preferably, the fresh air inlet duct includes a first inlet duct and a second inlet duct. The first inlet duct and the second inlet duct are respectively connected to opposite ends of the second heat exchanger. The first inlet duct is also connected to the outside, while the second inlet duct is connected to the inside of the kitchen.

[0020] Further, along the air flow path, a first temperature sensor is provided upstream of the second heat exchanger in the fresh air inlet duct, and a second temperature sensor is provided downstream of the second heat exchanger in the fresh air inlet duct. Thus, the circulation pump can be controlled according to the detected temperature.

[0021] Preferably, along the air flow path, an electric valve for controlling the on / off of the flow path in the first inlet duct is provided upstream of the second heat exchanger in the fresh air inlet duct. Thus, the fresh air inlet duct can be opened only when makeup air is needed.

[0022] The technical solution adopted by the present invention to solve the above second technical problem is: a control method for a kitchen air conditioning system as described above, characterized in that it includes the following steps:

[0023] 1) The oil fume extraction component is turned on, and the fresh air inlet duct is opened;

[0024] 2) Detect the incoming air temperature T1 upstream of the second heat exchanger, compare this incoming air temperature with the outgoing air temperature T2 downstream of the second heat exchanger, and correspondingly control the rotation direction and speed of the circulation pump according to the comparison difference ΔT = T2 - T1.

[0025] Specifically, in step 2), if T1≥a, where a is the first preset temperature threshold, the circulation pump rotates in reverse and adjusts its rotational speed according to the value of the temperature difference ΔT, and maintains operation; when the circulation pump rotates in reverse, the first heat exchanger serves as a condenser, and the second heat exchanger serves as an evaporator; if a>T1>b, where b is the second preset temperature threshold and b<a, the circulation pump rotates forward and adjusts its rotational speed according to the value of the temperature difference ΔT, and maintains operation; when the circulation pump rotates forward, the first heat exchanger serves as an evaporator, and the second heat exchanger serves as a condenser.

[0026] Specifically, in step 2), if b≥T1≥c, where c is the third preset temperature threshold and c<b, the circulation pump rotates forward and adjusts its rotational speed according to the value of the temperature difference ΔT; if c>T1, the circulation pump rotates forward and adjusts its rotational speed according to the value of the temperature difference ΔT.

[0027] To avoid the influence of too long heating duration on use and reduce energy consumption, an electric auxiliary heating device is provided in the fresh air inlet duct. When the circulation pump rotates forward for a preset heating time and the value of ΔT is detected not to reach the preset target value, the electric auxiliary heating function is turned on.

[0028] Compared with the prior art, the advantages of the present invention are as follows: Utilizing the heat pipe technology, the forward and reverse rotations of the working fluid circulation pump realize the function conversion of the two heat exchangers. For the two heat exchangers, the first heat exchanger is arranged on the oil fume flow path, and the second heat exchanger is arranged on the fresh air flow path. When the circulation pump rotates in reverse, the first heat exchanger serves as a condenser to release heat to the cooking fume, and the second heat exchanger serves as an evaporator to absorb heat from the introduced fresh air, which can pre-cool the fresh air. The first heat exchanger uses the external exhaust oil fume airflow to take away its heat, and utilizes the large air volume of the oil fume suction fan to achieve an excellent heat dissipation effect, so the pre-cooling effect is good; when the circulation pump rotates forward, the first heat exchanger serves as an evaporator to absorb heat from the cooking fume, and the second heat exchanger serves as a condenser to release heat to the introduced fresh air, using the oil fume gas discharged from cooking to pre-heat the fresh air, which is more environmentally friendly and energy-saving. Thus, the temperature of the supplemented fresh air is adjusted according to the ambient temperature, so that the supplemented fresh air is maintained at a comfortable temperature, improving the comfort of users in the kitchen and enhancing the user experience; the oil fume suction component and the fresh air component share a fan, with a more compact structure, saving space, cost, and having higher reliability; supplementing fresh air can balance the air flow balance in the kitchen, solving a series of pain points such as negative pressure caused by the oil fume exhaust of the range hood, poor smoking effect, and incomplete combustion of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the operation of the kitchen air conditioning system according to an embodiment of the present invention in cold weather;

[0030] Figure 2 It is a schematic diagram of the operation of the kitchen air conditioning system according to an embodiment of the present invention in hot weather;

[0031] Figure 3 Schematic diagram of the first heat exchanger of the kitchen air conditioning system according to an embodiment of the present invention;

[0032] Figure 4 Cross-sectional view of the first heat exchanger of the kitchen air conditioning system according to an embodiment of the present invention;

[0033] Figure 5 is Figure 4 Enlarged schematic view of partial region I of

[0034] Figure 6 Schematic diagram of the second heat exchanger of the kitchen air conditioning system according to an embodiment of the present invention;

[0035] Figure 7 is Figure 1 Schematic diagram of the fluid flowing through the first heat exchanger in the shown operating mode;

[0036] Figure 8 is Figure 1 Schematic diagram of the fluid flowing through the second heat exchanger in the shown operating mode;

[0037] Figure 9 is Figure 2 Schematic diagram of the fluid flowing through the first heat exchanger in the shown operating mode;

[0038] Figure 10 is Figure 2 Schematic diagram of the fluid flowing through the second heat exchanger in the shown operating mode;

[0039] Figure 11 Control flow chart of the kitchen air conditioning system according to an embodiment of the present invention. Detailed Description of the Invention

[0040] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0042] See Figure 1 and Figure 2 , a kitchen air conditioning system, including an oil fume extraction component and a fresh air component. The oil fume extraction component includes a fan 11, a first heat exchanger 12 arranged at the air outlet of the fan 11, and an exhaust pipe 13 connected to one end of the first heat exchanger 12 away from the fan 11. A part of the exhaust pipe 13 enters above the ceiling 100 of the kitchen, and the exhaust pipe 13 is connected to the outside or a common flue through a fire and check valve 14.

[0043] The fresh air component can adopt a modular design and includes a first air inlet pipe 21, a second air inlet pipe 22, and a second heat exchanger 23. The above components are all located above the ceiling 100. The first air inlet pipe 21 and the second air inlet pipe 22 form a fresh air inlet pipe and are respectively connected to opposite ends of the second heat exchanger 23. Among them, the first air inlet pipe 21 is also connected to the outside, while the second air inlet pipe 22 is connected to the interior of the kitchen. The end of the second air inlet pipe 22 away from the second heat exchanger 23 forms a fresh air inlet 221. The ceiling 100 can be hollowed out at a position corresponding to the fresh air inlet 221, that is, the end of the second air inlet pipe 22 is embedded in the ceiling 100, so that the second air inlet pipe 22 and the interior of the kitchen can be in fluid communication.

[0044] A filter screen 24 is provided at a position where the first air inlet pipe 21 is far from the second heat exchanger 23. Other protective devices can also be provided. The filter screen 24 filters and purifies the introduced external air, and the protective device can prevent foreign objects from entering to ensure safety. A first temperature sensor 25 and an electric valve 26 are also provided in the first air inlet pipe 21. The first temperature sensor 25 is used to detect the temperature of the entering air, and the electric valve 26 is used to control the on-off of the flow path in the first air inlet pipe 21, that is, to control whether the external air can enter the second heat exchanger 23 through the first air inlet pipe 21, and it is in a closed state by default. A second temperature sensor 27 is provided at a position close to the fresh air inlet 221 in the second air inlet pipe 22, which is used to detect the temperature of the fresh air replenished into the kitchen after heat exchange. An electric auxiliary heating device 30 can also be provided in the first air inlet pipe 21.

[0045] The oil fume extraction component and the fresh air component share the above-mentioned first heat exchanger 12 and second heat exchanger 23. The first heat exchanger 12 and the second heat exchanger 23 have the same structure and are both in the shape of a hollow pipe. See Figures 3 to 6 , taking the first heat exchanger 12 as an example, it includes a main body 121 and a heat transfer working medium channel 122. The main body 121 is in the shape of a hollow pipe, preferably cylindrical. The heat transfer working medium channel 122 is formed inside the wall of the main body 121. In this embodiment, it is spirally wound along the wall of the main body 121. In this embodiment, the main body 121 is arranged vertically, and the heat transfer working medium channel 122 is also arranged longitudinally. The cross-section of the heat transfer working medium channel 122 is not limited to shapes such as circular, elliptical, and polygonal, and a certain amount of heat transfer working medium can be filled inside, and the filling amount is about 50% - 70% of the total volume of the flow channel, leaving a phase change space for the heat transfer working medium.

[0046] The main body 121 includes two layers of heat conducting plates 1211, and the heat transfer working medium channel 122 is formed between the two layers of heat conducting plates 1211. The two layers of heat conducting plates 1211 only have a gap at the position where the heat transfer working medium channel 122 is formed, and are in contact with each other in other parts. Optionally, the heat conducting plate 1211 is a metal plate, such as preferably an aluminum plate. The two aluminum plates are hot-rolled and shaped, and the heat transfer working medium channel 122 is formed by blowing between the two aluminum plates, and then the whole is rolled into the required shape. The heat transfer working medium in the heat transfer working medium channel 122 is in zero-gap contact with the heat conducting plate 1211, and the heat exchange efficiency is extremely high.

[0047] The space surrounded by the inner heat conducting plate 1211 of the main body 121 constitutes an air flow channel 1212 for air to pass through. The inner side wall surface of the inner heat conducting plate 1211 (i.e., the inner side wall surface of the main body 121) and the outer side wall surface of the outer heat conducting plate 1211 (i.e., the outer side wall surface of the main body 121) both constitute heat exchange surfaces. Heat exchange fins can be provided in the space surrounded by the main body 121. To improve the anti-oil pollution performance of the first heat exchanger 12, the surface is treated by spraying process, such as super-oleophobic nano-coating, new water coating, etc.

[0048] The heat transfer medium channel 122 of the first heat exchanger 12 has a first channel opening 1221 and a second channel opening 1222 at its ends, respectively. The heat transfer medium channel 122 of the second heat exchanger 23 has a third channel opening 1223 and a fourth channel opening 1224 at its ends, respectively. The first channel opening 1221 of the first heat exchanger 12 and the third channel opening 1223 of the second heat exchanger 23 are connected by a first connecting pipe 281 to achieve fluid communication. The second channel opening 1222 of the first heat exchanger 12 and the fourth channel opening 1224 of the second heat exchanger 23 are connected by a second connecting pipe 282 to achieve fluid communication. The first connecting pipe 281 and the second connecting pipe 282 are made of a thermally insulating material to prevent heat from being conducted through the pipes, thereby reducing the system's heat transfer efficiency.

[0049] The heat transfer medium circulates between the first heat exchanger 12, the first connecting pipe 281, the second heat exchanger 23, the second connecting pipe 282, and the first heat exchanger 12 to achieve heat transfer. The circulation path is a closed space. To enhance the heat exchange efficiency, a circulation pump 29 is provided on the first connecting pipe 281 or the second connecting pipe 282 to transport the heat transfer medium to overcome the resistance of the system. The first heat exchanger 12, the first connecting pipe 281, the second heat exchanger 23, the second connecting pipe 282, and the circulation pump constitute a heat transfer system (the heat transfer system is equivalent to a heat pipe). The heat transfer medium can flow in the heat exchange system in a forward and reverse direction, which is achieved by the forward and reverse rotation of the circulation pump 29.

[0050] Cold weather, see Figure 1 、 Figure 7 and Figure 8 , the circulation pump 29 rotates forward, the first heat exchanger 12 acts as an evaporator to absorb heat from the cooking smoke, and the second heat exchanger 23 acts as a condenser to release heat to the incoming fresh air. The arrows indicate the direction of fluid flow. The heat transfer medium flows from the third channel port 1223 of the second heat exchanger 23 to the first channel port 1221 of the first heat exchanger 12. After heat exchange in the first heat exchanger 12, it flows from the second channel port 1221 to the fourth channel port 1224 of the second heat exchanger 23, and then flows out again after heat exchange in the second heat exchanger 23. The opposite is true in hot weather, see Figure 2 、 Figure 9 and Figure 10 Circulating pump 29 rotates in reverse, with the first heat exchanger 12 acting as a condenser to release heat to the cooking fumes, and the second heat exchanger 23 acting as an evaporator to absorb heat from the incoming fresh air. The arrows indicate the direction of fluid flow. In normal temperature weather, circulating pump 29 rotates forward at a relatively low speed, slightly adjusting the incoming fresh air temperature. The specific control method will be described in detail below.

[0051] Based on the temperature difference detected by the above-mentioned first temperature sensor 25 and second temperature sensor 27, the rotation direction and speed of the circulation pump 29 are adjusted. On the one hand, the functions of the two heat exchangers are switched under different seasons and different inlet air temperature conditions. On the other hand, the temperature of the introduced fresh air is reasonably controlled to ensure that the temperature of the fresh air introduced into the room is appropriate under different temperature conditions.

[0052] To achieve a better temperature regulation effect, the area ratio of the two heat exchangers in the heat transfer system can be adjusted according to the actual application environment, scenario, climate conditions, etc. For example, in cold regions, the heat transfer area of the second heat exchanger 23 can be increased to enhance the heat dissipation capacity of the introduced fresh air. In regions with higher temperatures, the heat transfer area of the first heat exchanger 12 can be appropriately increased to improve the heat dissipation capacity of the first heat exchanger 12, thereby achieving a better cooling effect on the introduced fresh air.

[0053] See Figure 11 , the control method of the kitchen air conditioning system of the present invention includes the following steps:

[0054] 1) The oil fume extraction component is turned on, and the electric valve 26 of the fresh air component is turned on (i.e., the fresh air inlet pipe is opened);

[0055] 2) The first temperature sensor 25 detects the inlet air temperature T1 (the temperature upstream of the second heat exchanger 23), and performs corresponding processing according to this inlet air temperature:

[0056] 2.1) If T1 ≥ a, where a is the first preset temperature threshold, such as 28°C in this embodiment, indicating that the ambient air is relatively hot and needs to be cooled; then the second temperature sensor 27 detects the outlet air temperature T2 (the temperature downstream of the second heat exchanger 23), and calculates ΔT = T2 = T1. The circulation pump 29 rotates in the reverse direction, and the speed is adjusted according to the value of the temperature difference ΔT (usually, -5K ≥ ΔT), and then step 4) is entered;

[0057] 2.2) If a > T1 > b, where b is the second preset temperature threshold and b < a, such as b is 15°C in this embodiment, indicating that the ambient air is at normal temperature; then the second temperature sensor 27 detects the outlet air temperature T2, and calculates ΔT = T2 = T1. The circulation pump 29 rotates forward, and the speed is adjusted according to the value of the temperature difference ΔT (usually, 3K ≥ ΔT ≥ -3K), and then step 4) is entered;

[0058] 2.3) If b ≥ T1 ≥ c, where c is the third preset temperature threshold and c < b, such as b is 5°C in this embodiment, indicating that the ambient air is relatively cold; then the second temperature sensor 27 detects the outlet air temperature T2, and calculates ΔT = T2 = T1. The circulation pump 29 rotates forward, and the speed is adjusted according to the value of the temperature difference ΔT (usually, ΔT ≥ 10K), and then step 3) is entered;

[0059] 2.4) If c > T1, indicating that the ambient air is cold; then the second temperature sensor 27 detects the outlet air temperature T2, calculates ΔT = T2 - T1, the circulation pump 29 rotates forward, adjusts the rotational speed according to the value of the temperature difference ΔT (usually, ΔT ≥ 15K), and then proceeds to step 3);

[0060] 3) If the value of ΔT cannot reach the target value after a long time (such as it can be set that more than n minutes is considered a long time, and n can be 10 for example), then turn on the electric auxiliary heating function, and then proceed to step 4);

[0061] 4) The system maintains normal operation;

[0062] 5) After cooking is completed, turn off the oil fume extraction component, stop the circulation pump 29, and finally close the electric valve 26.

[0063] The rotational speed of the circulation pump 29 is related to the change rate of the required temperature, and this speed change rate can be set according to requirements or can be determined and stored in advance through experiments. In addition, the target value of ΔT can be set according to experiments, experience or user requirements, such as setting ΔT so that T2 reaches a or between b and a.

[0064] As used in the present invention, "fluid communication" refers to the spatial position relationship between two components or parts (hereinafter uniformly referred to as the first part and the second part respectively), that is, a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first part and / or be transported to the second part. It can be that the first part and the second part are directly connected, or it can be that the first part and the second part are indirectly connected through at least one third party. The third party can be a fluid passage such as a pipe, a channel, a conduit, a flow guide, a hole, a groove, etc., or it can be a chamber allowing the fluid to flow through or a combination of the above.

Claims

1. A kitchen air conditioning system, comprising an oil fume extraction component and a fresh air component. The oil fume extraction component includes a fan (11), and the fresh air component includes a fresh air inlet duct for introducing fresh air into the kitchen. It is characterized in that: The kitchen air conditioning system further includes a heat transfer system, and the heat transfer system includes: A first heat exchanger (12), in the shape of a hollow pipe, arranged at the air outlet of the fan (11) and exchanging heat with the oil fume discharged by the oil fume extraction component; A second heat exchanger (23), in the shape of a hollow pipe, arranged on the fresh air inlet duct and exchanging heat with the air introduced by the fresh air inlet duct; and A circulation pump (29) capable of rotating forward and backward, enabling the heat transfer working medium to circulate between the first heat exchanger (12), the circulation pump (29) and the second heat exchanger (23).

2. The kitchen air conditioning system according to claim 1, wherein: The first heat exchanger (12) and the second heat exchanger (23) have the same structure and both have a heat transfer working medium channel (122). The two ends of the heat transfer working medium channel (122) of the first heat exchanger (12) respectively form a first channel port (1221) and a second channel port (1222), and the two ends of the heat transfer working medium channel (122) of the second heat exchanger (23) respectively form a third channel port (1223) and a fourth channel port (1224); The first channel port (1221) of the first heat exchanger (12) and the third channel port (1223) of the second heat exchanger (23) are connected through a first connecting pipe (281) made of heat-insulating material to achieve fluid communication, and the second channel port (1222) of the first heat exchanger (12) and the fourth channel port (1224) of the second heat exchanger (23) are connected through a second connecting pipe (282) made of heat-insulating material to achieve fluid communication; The circulation pump (29) is arranged on the first connecting pipe (281) or the second connecting pipe (282).

3. The kitchen air conditioning system according to claim 2, wherein: Each heat exchanger includes a main body (121). The main body (121) is in the shape of a hollow pipe, and the space surrounded by the main body (121) constitutes an air flow channel (1212) for air to pass through. The heat transfer working medium channel (122) is formed inside the wall of the main body (121).

4. The kitchen air conditioning system according to claim 3, characterized in that: The main body (121) includes two layers of heat conducting plates (1211), and the heat transfer working medium channel (122) is formed between the two layers of heat conducting plates (1211).

5. The kitchen air conditioning system according to claim 1, characterized in that: The fresh air inlet duct includes a first inlet duct (21) and a second inlet duct (22). The first inlet duct (21) and the second inlet duct (22) are respectively connected to opposite ends of the second heat exchanger (23). The first inlet duct (21) is also connected to the outside, while the second inlet duct (22) is connected to the inside of the kitchen.

6. The kitchen air conditioning system according to any one of claims 1 to 5, characterized in that: Along the air flow path, a first temperature sensor (25) is arranged upstream of the second heat exchanger (23) in the fresh air inlet duct, and a second temperature sensor (27) is arranged downstream of the second heat exchanger (23) in the fresh air inlet duct.

7. The kitchen air conditioning system according to any one of claims 1 to 5, characterized in that: Along the air flow path, an electric valve (26) for controlling the on-off of the flow path in the first inlet duct (21) is arranged upstream of the second heat exchanger (23) in the fresh air inlet duct.

8. A control method for a kitchen air conditioning system according to any one of claims 1 to 7, characterized in that: Including the following steps: 1) The oil fume extraction component is turned on, and the fresh air inlet duct is opened; 2) Detect the inlet air temperature T1 upstream of the second heat exchanger (23), compare this inlet air temperature with the outlet air temperature T2 downstream of the second heat exchanger (23), and accordingly control the rotation direction and rotation speed of the circulation pump (29) according to the comparison difference ΔT = T2 - T1.

9. The control method of the kitchen air conditioning system according to claim 8, characterized in that: In step 2), if T1 ≥ a, where a is the first preset temperature threshold, then the circulation pump (29) rotates in reverse and adjusts the rotation speed according to the value of the temperature difference ΔT, and maintains operation; when the circulation pump (29) rotates in reverse, the first heat exchanger (12) serves as a condenser, and the second heat exchanger (23) serves as an evaporator; if a > T1 > b, where b is the second preset temperature threshold and b < a, then the circulation pump (29) rotates forward and adjusts the rotation speed according to the value of the temperature difference ΔT, and maintains operation; when the circulation pump (29) rotates forward, the first heat exchanger (12) serves as an evaporator, and the second heat exchanger (23) serves as a condenser.

10. The control method of the kitchen air conditioning system according to claim 9, characterized in that: In step 2), if b ≥ T1 ≥ c, where c is the third preset temperature threshold and c < b, then the circulation pump (29) rotates forward and adjusts the rotation speed according to the value of the temperature difference ΔT; if c > T1, then the circulation pump (29) rotates forward and adjusts the rotation speed according to the value of the temperature difference ΔT.

11. The control method of the kitchen air conditioning system according to claim 10, characterized in that: An electric auxiliary heating device (30) is provided in the fresh air inlet duct. When the circulation pump (29) rotates forward for a preset heating time and the detected value of ΔT fails to reach the preset target value, the electric auxiliary heating function is turned on.

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