A heat exchange system, a kitchen ventilation device, and a kitchen integrated device

Abstract

This utility model discloses a heat exchange system applied to a kitchen ventilation device. It includes a first heat exchange unit, a second heat exchange unit, a refrigerant pipeline, and a power pump. The refrigerant pipeline connects the first and second heat exchange units to form a reversible refrigerant circulation loop. The first and second heat exchange units have a height difference. Refrigerant circulation in one direction of the heat exchange system is achieved by gravity due to the height difference, while refrigerant circulation in the other direction is achieved by the power pump. The first heat exchange unit is used for heat exchange with outside air in the kitchen, and the second heat exchange unit is used for heat exchange with inside air in the kitchen. Outside air is output to the kitchen environment. This utility model also discloses a kitchen ventilation device and integrated kitchen equipment. The advantages of this utility model are that it ensures a suitable air temperature introduced into the kitchen environment and has low energy consumption.

Description

Technical Field

[0001] This utility model relates to a heat exchange system, a kitchen ventilation device, and an integrated kitchen equipment, belonging to the technical field of kitchen appliances. Background Technology

[0002] In a kitchen environment, cooking produces fumes. Although technologies such as range hoods and air curtains exist, the air quality in the kitchen is still affected to some extent. Therefore, installing appropriate ventilation devices to introduce outside air into the kitchen can effectively improve this situation. However, in summer or winter scenarios, excessively high or low outdoor air temperatures can lead to unsuitable temperatures for the introduced air, reducing the user's cooking experience. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a heat exchange system, a kitchen ventilation device, and an integrated kitchen equipment to ensure that the air temperature introduced into the kitchen environment is suitable and that energy consumption is low.

[0004] This utility model is achieved through the following technical solution.

[0005] A heat exchange system is applied to a kitchen ventilation device, comprising a first heat exchange unit, a second heat exchange unit, a refrigerant pipe, and a power pump. The refrigerant pipe connects the first heat exchange unit and the second heat exchange unit to form a reversible refrigerant circulation loop.

[0006] The first heat exchange unit and the second heat exchange unit have a height difference. The refrigerant circulation in one direction of the heat exchange system is achieved by gravity caused by the height difference, while the refrigerant circulation in the other direction of the heat exchange system is achieved by a power pump.

[0007] The first heat exchange unit is used for heat exchange with the air outside the kitchen, the second heat exchange unit is used for heat exchange with the air inside the kitchen, and the air outside the kitchen is output to the kitchen environment.

[0008] As a further improvement of this utility model, it also includes a control valve, which and the power pump are connected in parallel on the refrigerant pipeline.

[0009] As a further improvement of this utility model, it also includes a controller for controlling the start and stop of the power pump and the control valve.

[0010] As a further improvement of this utility model, the first heat exchange unit is positioned higher than the second heat exchange unit.

[0011] When the temperature of the air outside the kitchen is lower than the temperature of the air inside the kitchen, the cold medium in the first heat exchange unit changes from a gaseous state to a liquid state, and the cold medium in the second heat exchange unit changes from a liquid state to a gaseous state. The cold medium circulates through gravity.

[0012] When the temperature of the air outside the kitchen is higher than the temperature of the air inside the kitchen, the cold medium in the first heat exchange unit changes from a liquid state to a gaseous state, and the cold medium in the second heat exchange unit changes from a gaseous state to a liquid state. The cold medium is circulated through the power pump.

[0013] As a further improvement of this utility model, it also includes a temperature sensor for detecting the temperature of the air outside the kitchen and providing the controller with the judgment conditions for controlling the power pump and control valve.

[0014] As a further improvement to this utility model, it also includes:

[0015] The third heat exchange unit is used for heat exchange of kitchen air that has been heat-exchanged by the second heat exchange unit, and the heat transfer direction of the third heat exchange unit is opposite to that of the second heat exchange unit.

[0016] As a further improvement of this utility model, the second heat exchange unit and the third heat exchange unit are integrated into a heat exchange assembly.

[0017] A kitchen ventilation device, comprising:

[0018] The casing and a first fan, a second fan and a heat exchange system installed inside the casing, wherein the first fan is used to introduce air from outside the kitchen and the second fan is used to introduce air from inside the kitchen;

[0019] The casing is provided with at least one air curtain opening for outputting kitchen outside air that has been heat-exchanged by the first heat exchange unit and forming an air curtain.

[0020] As a further improvement to this utility model, it also includes:

[0021] The air curtain duct assembly connects the first fan and multiple air curtain openings.

[0022] An integrated kitchen appliance, comprising:

[0023] Kitchen ventilation system;

[0024] The range hood unit is installed at the bottom of the kitchen ventilation system.

[0025] The beneficial effects of this utility model are:

[0026] 1. The heat exchange system is used in the kitchen ventilation device. It exchanges heat between the air inside the kitchen and the air outside the kitchen through the first heat exchange unit and the second heat exchange unit. The heat exchanged air outside the kitchen is then output to the kitchen environment. It is not limited to forming an air curtain through the air curtain outlet to block the escape of oil fumes, but also includes using the air outside the kitchen as fresher and higher quality fresh air at a suitable temperature to improve the air quality inside the kitchen.

[0027] 2. By setting the first heat exchange unit and the second heat exchange unit at different horizontal heights, the cold medium can be circulated in one direction by utilizing gravity, thus saving energy without the need for power. Attached Figure Description

[0028] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein:

[0029] Figure 1 This is a schematic diagram of a heat exchange system;

[0030] Figure 2 This is a connection diagram of a heat exchange system;

[0031] Figure 3 This is a schematic diagram of a heat exchange system operating in a winter scenario.

[0032] Figure 4 This is a schematic diagram of a heat exchange system operating in a summer scenario.

[0033] Figure 5 A schematic diagram illustrating how outside air introduced into the kitchen is heated or cooled to form an air curtain;

[0034] Figure 6 A schematic diagram of the internal structure of a kitchen ventilation system from one perspective;

[0035] Figure 7 A schematic diagram of the internal structure of a kitchen ventilation system from another perspective;

[0036] Figure 8 This is a schematic diagram showing the arrangement of air curtain openings and air outlets on a kitchen ventilation system.

[0037] Figure 9 This is a schematic diagram of an air curtain duct assembly from one perspective.

[0038] Figure 10 This is a schematic diagram of the air curtain duct assembly from another perspective.

[0039] Figure 11 This is a schematic diagram illustrating the steps of a control method based on a kitchen ventilation device.

[0040] Figure 12This is a schematic diagram of an integrated kitchen appliance. Detailed Implementation

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

[0042] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0043] Implementation Case 1:

[0044] Reference Figures 1-9 A kitchen ventilation device, specifically referring to... Figure 6 and Figure 7 It includes a housing 11, a first fan 121, a second fan 122, and a heat exchange system, all of which are located inside the housing 11.

[0045] In this embodiment, the first fan 121 is used to introduce outside air into the casing 11 and eventually output outside air into the kitchen environment. The outside air is usually outdoor air, which is fresher than the air inside the kitchen. The second fan 122 is used to introduce inside air into the casing 11.

[0046] In this implementation case, refer to Figure 1 and Figure 2 The heat exchange system includes a first heat exchange unit 131 and a second heat exchange unit 132, which form a reversible refrigerant circulation loop. The first heat exchange unit 131 exchanges heat with outside air introduced by the first fan 121, and the second heat exchange unit 132 exchanges heat with inside air introduced by the second fan 122. (Refer to...) Figure 8 In this embodiment, the kitchen ventilation device works in conjunction with the range hood device 2. The kitchen ventilation device is located above the range hood device 2. The casing 11 is provided with at least one air curtain opening a. The air curtain opening a is used to output the kitchen outside air that has undergone heat exchange in the first heat exchange unit 131 and forms an air curtain. The air curtain can effectively prevent the cooking fumes from escaping during the process of being sucked in by the range hood device 2, thereby improving the fume extraction effect.

[0047] By introducing outside air into the kitchen, an air curtain can be created to prevent cooking fumes from escaping, effectively improving kitchen air quality. However, in summer, the outside air temperature is high, resulting in a high-temperature air curtain in the kitchen environment. In winter, the outside air temperature is low, resulting in a low-temperature air curtain in the kitchen environment. Both of these factors lead to a relatively poor user experience.

[0048] In this implementation case, the heat exchange system exchanges heat with the air outside the kitchen and the air inside the kitchen respectively through the first heat exchange unit 131 and the second heat exchange unit 132, which form a reversible refrigerant circulation loop. This effectively achieves heat exchange between the air outside the kitchen and the air inside the kitchen, making the air curtain temperature output to the kitchen environment more suitable and improving the user's comfort.

[0049] In addition, by exchanging heat between the air outside and inside the kitchen through a heat exchange system, the temperature of the air curtain can be improved, which can effectively reduce the energy consumption of the kitchen ventilation device in this embodiment and achieve the effect of saving energy.

[0050] It should be noted that the kitchen ventilation device in this embodiment is used in extreme climates. The heat exchange system alone is used to exchange heat between the air outside the kitchen and the air inside the kitchen. The temperature of the air curtain cannot reach the range of comfort for users. Therefore, the kitchen ventilation device in this embodiment is also equipped with a preheating device and a precooling device (not shown in the figure). In extreme climates, the air outside the kitchen introduced by the first fan 121 can be preheated or cooled before the air outside the kitchen and the air inside the kitchen can be exchanged through the heat exchange system.

[0051] Specifically, in winter, the temperature of the air outside the kitchen is low, while the temperature of the air inside the kitchen is higher. The second heat exchange unit 132 absorbs heat from the air inside the kitchen, and through refrigerant circulation, the first heat exchange unit 131 transfers the heat to the air outside the kitchen, thus heating the air outside the kitchen and increasing the temperature of the air curtain output to the kitchen environment. In summer, the temperature of the air outside the kitchen is high, while the temperature of the air inside the kitchen is lower. The first heat exchange unit 131 absorbs heat from the air outside the kitchen, and through refrigerant circulation, the second heat exchange unit 132 transfers the heat to the air inside the kitchen, thus cooling the air outside the kitchen and lowering the temperature output to the kitchen environment.

[0052] In winter, the first heat exchange unit 131 functions as a condenser and the second heat exchange unit 132 functions as an evaporator; in summer, the first heat exchange unit 131 functions as an evaporator and the second heat exchange unit 132 functions as a condenser.

[0053] In this implementation case, refer to Figure 1 and Figure 2 The heat exchange system also includes a refrigerant pipe 133 and a power pump 134. The refrigerant pipe 133 connects the first heat exchange unit 131 and the second heat exchange unit 132 and forms a reversible refrigerant circulation loop. The refrigerant flows in the first heat exchange unit 131, the second heat exchange unit 132 and the refrigerant pipe 133. The refrigerant is the refrigerant, usually Freon. The power pump 134 is used to provide the power for the flow of the refrigerant.

[0054] In this embodiment, the first heat exchange unit 131 and the second heat exchange unit 132 have a height difference, which is integral to the whole. The refrigerant, in a liquid state, flows from the higher position to the lower position under the influence of gravity, thus enabling refrigerant circulation in one direction of the heat exchange system through gravity. The refrigerant circulation in the other direction of the heat exchange system is powered by the power pump 134. By setting the first heat exchange unit 131 and the second heat exchange unit 132 at different horizontal heights, gravity can be used to achieve refrigerant circulation in one direction, eliminating the need for additional power and thus saving energy.

[0055] It should be noted that in some implementation cases, the heat exchange system of this implementation case is applied in the kitchen ventilation device. The first heat exchange unit 131 and the second heat exchange unit 132 exchange heat between the air inside the kitchen and the air outside the kitchen. The heat exchanged air outside the kitchen is output to the kitchen environment. This is not limited to forming an air curtain through the air curtain outlet a to block the escape of oil fumes, but also includes using the air outside the kitchen as fresher and higher quality fresh air at a suitable temperature to improve the air quality inside the kitchen.

[0056] In this embodiment, the first heat exchange unit 131 is positioned higher than the second heat exchange unit 132 within the casing 11. When the temperature of the air outside the kitchen is lower than the temperature of the air inside the kitchen, the refrigerant in the first heat exchange unit 131 changes from a gaseous state to a liquid state, and the refrigerant in the second heat exchange unit 132 changes from a liquid state to a gaseous state, with the refrigerant circulating due to gravity. When the temperature of the air outside the kitchen is higher than the temperature of the air inside the kitchen, the refrigerant in the first heat exchange unit 131 changes from a liquid state to a gaseous state, and the refrigerant in the second heat exchange unit 132 changes from a gaseous state to a liquid state, with the refrigerant circulating through the power pump 134. (Refer to...) Figure 3 In winter applications, the heat exchange system can exchange heat between the air outside and inside the kitchen without requiring power, thus heating the air outside the kitchen; (Refer to...) Figure 4In summer applications, the heat exchange system needs to start the power pump 134 to exchange heat between the air outside the kitchen and the air inside the kitchen, thereby completing the cooling effect on the air outside the kitchen.

[0057] In this embodiment, the heat exchange system also includes a control valve 135, which is connected in parallel with the power pump 134 on the refrigerant pipeline 133, i.e., the control valve 135 serves as a bypass route. In applications requiring a higher air curtain temperature, such as in winter, the control valve 135 is opened and the power pump 134 is turned off. The refrigerant in the first heat exchange unit 131 changes from a gaseous state to a liquid state and flows through the control valve 135 into the second heat exchange unit 132 for vaporization and circulation. In applications requiring a lower air curtain temperature, such as in summer, the control valve 135 is closed and the power pump 134 is started. The refrigerant in the second heat exchange unit 132 changes from a gaseous state to a liquid state and flows through the power pump 134 into the first heat exchange unit 131 for liquefaction and circulation. In applications where the air curtain temperature does not need to be changed, such as in spring and autumn, both the control valve 135 and the power pump 134 are closed. The control valve 135 can be configured as a solenoid valve, which offers advantages such as fast response, high control accuracy, and high reliability.

[0058] In this embodiment, the heat exchange system also includes a controller (not shown in the figure), which controls the starting and stopping of the power pump 134 and the control valve 135. In applications requiring increased air curtain temperature, the controller opens the control valve 135 and shuts down the power pump 134; in applications requiring decreased air curtain temperature, the controller closes the control valve 135 and starts the power pump 134; in applications where no change in air curtain temperature is required, the controller shuts down both the control valve 135 and the power pump 134.

[0059] In this embodiment, the heat exchange system also includes a temperature sensor (not shown in the figure) for detecting the temperature of the air outside the kitchen. Based on the detection result, it is determined whether the heat exchange system needs to intervene to increase or decrease the temperature of the air curtain. That is, the temperature sensor provides the controller with the judgment conditions for controlling the power pump 134 and the control valve 135.

[0060] In this implementation case, refer to Figure 5The kitchen ventilation system also includes a heater c1, a cooler c2, a first temperature sensor, and a second temperature sensor (not shown in the figure). The heater c1 and cooler c2 are used to compensate for heating or cooling the outside air introduced by the first fan 121. The heater c1 and cooler c2 are primarily used in extreme climates, such as extremely hot or cold climates, where the first heat exchange unit 131 of the heat exchange system alone cannot control the air curtain temperature within a suitable range. In such cases, the heater c1 and cooler c2 compensate for heating or cooling the introduced outside air, thus working in conjunction with the first heat exchange unit 131 to ensure the output air curtain reaches a suitable temperature range. The first and second temperature sensors are used to detect the temperature of the air inside the kitchen and the temperature of the air curtain, respectively. By determining the temperature difference between the two, the system determines whether the heater c1 or cooler c2 should be activated, thus providing the conditions for controlling the activation of the heater c1 and cooler c2.

[0061] The heater c1 and the cooler c2 can be located upstream of the first heat exchange unit 131 or downstream of the first heat exchange unit 131. The heater c1 can be specifically configured as an electric heating wire or a PTC heating element, and the cooler c2 can be specifically configured as a semiconductor refrigeration chip.

[0062] In this embodiment, the first fan 121 has multiple power levels. Even after compensating for heating or cooling with heater c1 or cooler c2, the temperature difference between the air temperature inside the kitchen and the air curtain temperature, as detected by the first and second temperature sensors, remains significant. This means the air curtain temperature cannot be controlled to a suitable range. Therefore, reducing the power level of the first fan 121 decreases the flow rate of outside air introduced by the fan, allowing for more thorough heat exchange with the first heat exchange unit 131, heater c1, and cooler c2. This enhances the heating or cooling effect, bringing the air curtain temperature to a suitable range. Thus, the first and second temperature sensors not only provide the conditions for controlling heater c1 and cooler c2 but also for adjusting the power level of the first fan 121.

[0063] In this embodiment, air curtain opening a is equipped with a movable adjusting plate (not shown in the figure). The adjusting plate is used to control the size of the air curtain opening a. The adjusting plate can be configured as a rotatable blade embedded in the air curtain opening a, and its opening and closing angle is driven by a stepper motor. While the air curtain temperature can be controlled within a suitable range by reducing the power level of the first fan 121 to enhance the heating or cooling effect, the airflow from air curtain opening a decreases due to the sacrifice of power output by the first fan 121. Therefore, the first and second temperature sensors provide the conditions for adjusting the adjusting plate, controlling it to reduce the size of the air curtain opening a. By utilizing the Venturi effect, the airflow velocity from air curtain opening a is increased, thereby ensuring the coverage area of ​​the air curtain and preventing the escape of oil fumes due to a reduced coverage area.

[0064] The kitchen ventilation system in this implementation case refers to... Figure 9 and Figure 10 and combined Figure 6 and Figure 7 It also includes an air curtain duct assembly 14, which connects the first fan 121 and multiple air curtain outlets a. The air outside the kitchen introduced by the first fan 121 flows along the air curtain duct assembly 14 and is finally output from the air curtain outlets a to form a stable air curtain.

[0065] In this implementation case, combined with Figure 8 The air curtain opening a includes a front air curtain opening a1 and a side air curtain opening a2. The housing 11 is provided with at least one front air curtain opening a1 on the front side of the range hood device 2, and at least one side air curtain opening a2 is provided on each side of the range hood device 2. The air curtain pipe assembly 14 connects the first fan 121 and the front air curtain opening a1 and the side air curtain opening a2, so that the front air curtain opening a1 forms an air curtain on the front side of the range hood device 2, and the side air curtain opening a2 forms air curtain openings a on both sides of the range hood device 2. The air curtain at the front of the range hood unit 2 prevents cooking fumes from escaping towards the user, effectively preventing the user from inhaling the fumes. The air curtains on both sides of the range hood unit 2 prevent cooking fumes from escaping to the sides. The air curtains formed at these three different locations can surround the cooking fumes, improving the efficiency of the range hood in absorbing cooking fumes and preventing the fumes from escaping and polluting the air quality in the kitchen. In addition, since the air curtains are formed by outside air at a suitable temperature, they can further improve the air quality in the kitchen environment, enhancing the user's comfort and experience while cooking.

[0066] In addition, the front air curtain opening a1 and the side air curtain opening a2 are designed to be horizontally narrow and long. On the one hand, this can increase the width of the air curtain to increase the blocking range of oil fumes, and on the other hand, it can increase the wind force, making the blocking effect of the air curtain stronger.

[0067] In this implementation case, the position of the front air curtain opening a1 corresponding to the air curtain pipe group 14 is located upstream of the side air curtain opening a2 corresponding to the air curtain pipe group 14. Therefore, the air force of the air curtain located in front of the range hood device 2 is theoretically the strongest, which can effectively isolate the oil fumes from the user and prevent the user from inhaling oil fumes while cooking.

[0068] In this implementation case, refer to Figure 9 and Figure 10 The air curtain pipe assembly 14 includes an air curtain main pipe 141 and an air curtain branch pipe 142. The air curtain main pipe 141 is connected to the first fan 121. The middle part of the air curtain branch pipe 142 is connected to the air curtain main pipe 141, and both ends of the air curtain branch pipe 142 are closed ends. The air curtain branch pipe 142 has a front air hole 14a that connects to the front air curtain opening a1 and a side air hole 14b that connects to the side air curtain opening a2. The outdoor air introduced by the first fan 121 flows along the main air curtain duct 141. When it reaches the middle of the air curtain branch duct 142, it splits into two streams, which flow to opposite ends of the branch duct 142. The outdoor air first flows through the front air vent 14a and is discharged from the front air curtain outlet a1, forming an air curtain located in front of the range hood device 2. Then it flows through the side air vent 14b and is discharged from the side air curtain outlet a2, forming an air curtain located on the side of the range hood device 2. By configuring the air curtain duct assembly 14 as a combination of the main air curtain duct 141 and the air curtain branch duct 142, the structure of the air curtain duct assembly 14 can be simplified, and the output efficiency of the outdoor air can be improved.

[0069] In this embodiment, the air curtain diversion pipe 142 has a front pipe 1421 extending in the left-right direction and two side pipes 1422 connecting the left and right ends of the front pipe 1421 and extending in the front-back direction. The middle of the front pipe 1421 connects to the main air curtain pipe 141, and the rear ends of the two side pipes 1422 are closed. The front pipe 1421 is positioned within the housing 11 corresponding to the front panel of the housing 11, and the two side pipes 1422 are positioned within the housing 11 corresponding to the two side panels of the housing 11. The front pipe portion of the air curtain diversion pipe 142 corresponds to the front panel of the housing 11, and the side pipe portions correspond to the side panels of the housing 11. This arrangement prevents the air curtain diversion pipe 142 from encroaching on the space within the housing 11, which is beneficial for the layout of other functional components within the housing 11.

[0070] In this embodiment, at least one burner (not shown in the figure) is located below the range hood device 2. The casing 11 has a front air curtain opening a1 at least above the corresponding burner, so that the air curtain formed by the front air curtain opening a1 is located directly in front of the oil fumes generated by the burner, making the air curtain more effective at blocking the oil fumes. Typically, household kitchens have two burners, and correspondingly, the casing 11 has a front air curtain opening a1 above each of the two burners.

[0071] The kitchen ventilation device in this embodiment has a width in the left-right direction that is roughly the same as that of the range hood device 2, and a thickness in the front-back direction that is greater than that of the range hood device 2. Therefore, the front air curtain opening a1 is located at the front of the bottom plate of the housing 11, and the side air curtain opening a2 is located at the bottom of the side plate of the housing 11, so that the distance between the air curtain and the fumes at the three positions is kept within an effective and reliable blocking range.

[0072] The kitchen ventilation device in this embodiment also includes a filter structure for filtering the outside air introduced by the first fan 121 to prevent dust and other contaminants from being brought into the kitchen environment. More specifically, the filter structure can be a filter screen, which can be installed on the first fan 121, on the air curtain duct assembly 14, or simultaneously on both the first fan 121 and the air curtain duct assembly 14.

[0073] The kitchen ventilation system in this implementation case refers to... Figure 1 It also includes a third heat exchange unit 151, where the kitchen air that has undergone superheat exchange with the second heat exchange unit 132 exchanges heat again with the third heat exchange unit 151. The heat transfer directions of the third heat exchange unit 151 and the second heat exchange unit 132 are opposite, thereby ensuring that the temperature of the kitchen air introduced by the second fan 122 reaches a suitable level. (Refer to...) Figure 8 The housing 11 is provided with at least one air outlet b for outputting kitchen air that has undergone heat exchange with the third heat exchange unit 151, so as to maintain a suitable temperature in the kitchen environment. In addition, the air outlet b is located on the front panel of the housing 11 and extends laterally.

[0074] By incorporating a third heat exchange unit 151 and an air outlet b, the kitchen ventilation system in this embodiment can be adapted to various application scenarios. For example, when cooking in an environment that generates fumes, an air curtain can be provided by air curtain outlet a. In summer or winter application scenarios, a temperature-appropriate air curtain can be provided through the heat exchange system. In this application scenario, temperature-appropriate air can also be output through air outlet b. When cooking without generating fumes, and in summer or winter application scenarios, temperature-appropriate air can be output through air outlet b to improve the temperature of the kitchen environment.

[0075] Reference Figure 6 and Figure 7 The casing 11 also contains an exhaust fan 152, a compressor 153, a condenser 154, a connecting pipe 155, etc. The above components and the third heat exchange unit 151 constitute the air conditioning module "indoor unit" and "outdoor unit" integrated in the casing 11. Its working principle is existing technology and will not be described again.

[0076] In this implementation case, refer to Figure 1The second heat exchange unit 132 and the third heat exchange unit 151 are integrated into a heat exchange assembly 16, which can improve the integration of internal components of the housing 11, reduce costs, and compress the space of the internal layout.

[0077] Implementation Case 2:

[0078] A control method, referring to Figure 11 and combined Figures 1-8 Based on the kitchen ventilation device 1 in Implementation Case 1.

[0079] The steps include:

[0080] Step S1: Start the first fan 121 to introduce outside air into the kitchen, and output air from the air curtain outlet a to form an air curtain;

[0081] Step S2: Determine the temperature of the air outside the kitchen, and determine whether the heat exchange system should be put into operation based on the temperature of the air outside the kitchen.

[0082] Step S2 involves determining the temperature of the air outside the kitchen and then determining whether the heat exchange system is operational based on that temperature. This includes the following three scenarios:

[0083] Scenario a: When the temperature of the air outside the kitchen is between the low temperature threshold and the high temperature threshold, the heat exchange system does not enter the working state.

[0084] In scenario a, the temperature of the air outside the kitchen is detected by a temperature sensor. The temperature of the air outside the kitchen is in a suitable state, that is, there is no need to heat or cool the air outside the kitchen through a heat exchange system. In this implementation case, the low temperature threshold is set to 16℃ and the high temperature threshold is set to 30℃.

[0085] Scenario b: When the temperature of the air outside the kitchen is lower than the low temperature threshold, the second fan 122 is activated to introduce air into the kitchen, the heat exchange system enters the working state, and the first heat exchange unit 131 transfers heat to the air outside the kitchen, while the air inside the kitchen transfers heat to the second heat exchange unit 132.

[0086] In scenario b, the temperature sensor detects the air temperature outside the kitchen, which is found to be low, below 16°C.

[0087] Scenario c: When the temperature of the air outside the kitchen is higher than the high temperature threshold, the fan is activated to introduce air into the kitchen, the heat exchange system enters the working state, and the air outside the kitchen transfers heat to the first heat exchange unit 131, and the second heat exchange unit 132 transfers heat to the air inside the kitchen.

[0088] In scenario c, the temperature sensor detects the air temperature outside the kitchen, which is found to be high, i.e., above 30°C.

[0089] The control method in this implementation case, in the case of scenario b or scenario c, also includes the following steps:

[0090] The control method in this implementation case, in the case of scenario b or scenario c, also includes the following steps:

[0091] Step S3: When the heat exchange system is in operation, detect the air in the kitchen and the air curtain, and compare the temperature difference between the two with the threshold temperature difference. If the temperature difference between the air in the kitchen and the air curtain is less than the threshold temperature difference, then no compensation heating or cooling is performed on the air from outside the kitchen introduced by the first fan 121; if the temperature difference between the air in the kitchen and the air curtain is not less than the threshold temperature difference, then compensation heating or cooling is performed on the air from outside the kitchen introduced by the first fan 121.

[0092] In step S3, the temperature Tn of the air in the kitchen and the temperature Ts of the air curtain are detected by the first temperature sensor and the second temperature sensor. The temperature difference ΔT between the air temperature Tn and the air curtain temperature Ts is determined. Then, the temperature difference ΔT is compared with the threshold temperature difference to determine whether the heater or cooler needs to be intervened to compensate for heating or cooling of the air outside the kitchen.

[0093] The control method in this implementation case, in the case of scenario b or scenario c, also includes the following steps:

[0094] Step S4: If the temperature difference between the air inside the kitchen and the air curtain is still not less than the threshold temperature difference after compensating for heating or cooling the air outside the kitchen introduced by the first fan 121, reduce the power level of the first fan 121 and reduce the size of the air curtain opening a.

[0095] In step S4, after compensating for heating or cooling, if the temperature difference ΔT is still not less than the threshold temperature difference, the power level of the first fan 121 is reduced to decrease the flow rate of the incoming outside air, thereby making the heat exchange between the outside air and the first heat exchange unit 131 and the heater or cooler more complete, thus improving the heating or cooling effect. At the same time, the size of the air curtain opening a is reduced, which can increase the air outlet speed of the air curtain opening a at the expense of air volume, so as to ensure that the coverage of the air curtain is still sufficient to block the fumes.

[0096] Implementation Case 3:

[0097] An integrated kitchen appliance, as described above Figure 12 It includes a kitchen ventilation device 1 and a range hood device 2, wherein the kitchen ventilation device 1 is as shown in Embodiment 1, and the range hood device 2 is installed at the bottom of the kitchen ventilation device 1.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat exchange system characterized by, The device is used in kitchen ventilation systems and includes a first heat exchange unit (131), a second heat exchange unit (132), a refrigerant pipe (133), and a power pump (134). The refrigerant pipe (133) connects the first heat exchange unit (131) and the second heat exchange unit (132) to form a reversible refrigerant circulation loop. The first heat exchange unit (131) and the second heat exchange unit (132) have a height difference. The refrigerant circulation in one direction of the heat exchange system is achieved by the gravity formed by the height difference, and the refrigerant circulation in the other direction of the heat exchange system is achieved by the power pump (134). The first heat exchange unit (131) is used to exchange heat with the air outside the kitchen, and the second heat exchange unit (132) is used to exchange heat with the air inside the kitchen. The air outside the kitchen is output to the kitchen environment.

2. The heat exchange system of claim 1, wherein, It also includes a control valve (135), which is connected in parallel with the power pump (134) on the refrigerant pipe (133).

3. The heat exchange system of claim 2, wherein, It also includes a controller for controlling the start and stop of the power pump (134) and the control valve (135).

4. The heat exchange system of claim 2, wherein, The first heat exchange unit (131) is positioned higher than the second heat exchange unit (132); When the temperature of the air outside the kitchen is lower than the temperature of the air inside the kitchen, the cold medium in the first heat exchange unit (131) changes from a gaseous state to a liquid state, and the cold medium in the second heat exchange unit (132) changes from a liquid state to a gaseous state, and the cold medium circulates through gravity. When the temperature of the air outside the kitchen is higher than the temperature of the air inside the kitchen, the cold medium in the first heat exchange unit (131) changes from liquid to gas, the cold medium in the second heat exchange unit (132) changes from gas to liquid, and the cold medium is circulated through the power pump (134).

5. The heat exchange system of claim 3, wherein, It also includes a temperature sensor for detecting the temperature of the air outside the kitchen and providing the controller with the conditions for controlling the power pump (134) and the control valve (135).

6. The heat exchange system according to any one of claims 1 to 5, wherein Also includes: The third heat exchange unit (151) is used for heat exchange of kitchen air that has been heat exchanged by the second heat exchange unit (132), and the heat transfer directions of the third heat exchange unit (151) and the second heat exchange unit (132) are opposite.

7. The heat exchange system of claim 6, wherein, The second heat exchange unit (132) and the third heat exchange unit (151) are integrated into a heat exchange assembly (16).

8. A kitchen ventilation device, characterized in that, include: The housing (11) and the first fan (121), the second fan (122) disposed within the housing (11) and the heat exchange system according to any one of claims 1-7, wherein the first fan (121) is used to introduce air from outside the kitchen and the second fan (122) is used to introduce air from inside the kitchen; The housing (11) is provided with at least one air curtain opening (a) for outputting kitchen outside air that has been heat-exchanged by the first heat exchange unit and forming an air curtain.

9. The kitchen ventilation device according to claim 8, characterized in that Also includes: An air curtain duct assembly (14) is connected to the first fan (121) and the plurality of air curtain openings (a).

10. A kitchen integrated device characterized by, include: - a kitchen ventilation device (1) according to claim 8 or 9; - an extractor hood device (2) arranged at the bottom of the kitchen ventilation device (1).

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