Kitchen air supplement system and air supplement method using same

Abstract

The invention relates to a kitchen air supplement system and an air supplement method applying the system, and the kitchen air supplement system comprises an air supplement assembly which comprises an air supplement pipeline, an air inlet of the air supplement pipeline is communicated with a natural air source, and an air outlet of the air supplement pipeline is communicated with the interior of a kitchen; the air supplementing assembly further comprises a heat exchanger located between the air inlet and the air outlet of the air supplementing pipeline, the heat exchanger is provided with a water flow channel and an air flow channel, and the two ends of the air flow channel communicate with the air inlet and the air outlet of the air supplementing pipeline correspondingly. A water inlet of the water flow channel is communicated with a hot water outlet end of the water heating device in the kitchen through a first pipeline, and a water outlet of the water flow channel is communicated with a water inlet end of the water heating device in the kitchen through a second pipeline. According to the system, fresh air is supplemented and preheated, the problem of kitchen negative pressure pumping caused by door and window closing is solved, meanwhile, the air supplementing use experience is improved, an existing water heating device in a kitchen is fully utilized, the dual-purpose effect is achieved, energy is saved, and the cost is low.

Description

Technical Field

[0001] The present invention relates to a kitchen air make-up system and an air make-up method using the system. Background Art

[0002] When cooking, in order to reduce the spread of kitchen fumes into the living room or bedroom, people generally close the kitchen door to form a closed space. However, the kitchen space is generally small. During cooking, the range hood continuously sucks and discharges the air in the kitchen, resulting in negative pressure in the kitchen, which affects the fume suction and discharge effect of the range hood. At the same time, it is extremely easy to cause insufficient oxygen supply for the gas stove, resulting in incomplete combustion and a large amount of harmful components in the discharged waste gas.

[0003] In the prior art, the method of opening windows for ventilation is usually adopted to alleviate the above technical problems. However, in rainy, windy or cold weather, if the windows are opened, the temperature of the fresh air replenished into the room in cold weather is relatively low, which may cause discomfort to users and lead to poor use experience.

[0004] For this reason, a Chinese utility model patent with the patent number ZL202022871874.8 (the authorized announcement number is CN215001761U) discloses an air make-up system for a kitchen. The air make-up system includes an air make-up power component, an air duct, a pressure detection component and an air make-up valve component. One end of the air make-up power component is communicated with the outside, the other end is communicated with one end of the air make-up valve component through the air duct, the other end of the air make-up valve component is communicated with the kitchen, and the pressure detection component is connected with the air make-up valve component. In the above air make-up system, air make-up is carried out only when the range hood is working and the pressure difference between the inside and outside of the kitchen meets certain conditions. Compared with the traditional air make-up method that starts as long as the range hood is working, it ensures the balance of the pressure difference between the inside and outside of the kitchen. And the air make-up power component includes a fan, a first power supply module, a first communication module, a temperature sensor, a refrigeration module, a heating module and a controller.

[0005] Although the above air make-up system can obtain the current ambient temperature through the temperature sensor and control the working states of the refrigeration module and the heating module according to the ambient temperature, thereby improving the comfort level of the kitchen environment by cooling the outside air through the refrigeration module or heating the outside air through the heating module. However, there are still the following limitations in the use of the above air make-up system: on the one hand, since the air make-up power component in the above air make-up system is placed outdoors and the air make-up power component is connected to one end of the air make-up valve component of each kitchen through the air duct, due to the long distance between the air make-up power component and the air make-up valve component of each kitchen, the energy loss of the air replenished through the air duct will occur, so the temperature of the air entering each kitchen cannot be accurately controlled; on the other hand, the above air make-up power component has both a refrigeration module and a heating module, and its power consumption during operation is large and the cost is high. Therefore, further improvement of the prior art is needed. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide an energy-saving kitchen air supply system that can accurately control the temperature of fresh air entering the kitchen in response to the above-mentioned existing technology.

[0007] The second technical problem to be solved by the present invention is to provide an air supply method using the above-mentioned kitchen air supply system.

[0008] The technical solution adopted by the present invention to solve the first technical problem is: a kitchen air supply system, comprising:

[0009] An air supply component includes an air supply duct, the air inlet of the air supply duct is connected to a natural wind source, and the air outlet of the air supply duct is connected to the kitchen;

[0010] It is characterized in that: the air supply component also includes a heat exchanger located between the air inlet and the air outlet of the air supply duct, the heat exchanger has a water flow channel and an air flow channel, the two ends of the air flow channel are respectively connected to the air inlet and the air outlet of the air supply duct, the water inlet of the water flow channel is connected to the hot water outlet end of the water heating device in the kitchen through a first pipe, and the water outlet of the water flow channel is connected to the water inlet end of the water heating device in the kitchen through a second pipe.

[0011] In order to ensure the heat exchange effect, preferably, the interior of the heat exchanger is hollow to form the above-mentioned air flow channel, and the water flow channel is spirally arranged on the outer peripheral wall of the heat exchanger.

[0012] In order to improve the heat exchange effect, heat exchange fins are provided in the air flow channel.

[0013] In order to realize automatic control of the air supply action, the air supply component also includes an air supply valve arranged in the air supply duct and a controller electrically connected to the air supply valve. The controller is configured to: control the air supply valve to open so that the air supply duct can supply air to the kitchen or control the air supply valve to close so that the air supply duct stops supplying air to the kitchen.

[0014] In order to realize intelligent control of the air supply action in the kitchen, the kitchen air supply system also includes a detection module for detecting the working status of the range hood in the kitchen. The detection module is electrically connected to the controller, and the controller is used to control the linkage between the air supply valve and the range hood.

[0015] Preferably, along the air flow direction, the make-up air assembly further includes a first temperature sensor disposed upstream of the heat exchanger and adjacent to the air inlet of the make-up air duct. The first temperature sensor is electrically connected to a controller, and the controller is configured to determine whether it is necessary to heat the make-up air according to the detection result of the first temperature sensor. In this way, by preliminarily judging the temperature of the natural air source, it is determined whether it is necessary to heat the make-up air, thereby improving the user experience.

[0016] To determine whether the temperature of the make-up air reaches a temperature suitable for the human body, along the air flow direction, the make-up air assembly further includes a second temperature sensor disposed downstream of the heat exchanger and adjacent to the air outlet of the make-up air duct. The second temperature sensor is electrically connected to the controller.

[0017] To realize the detection of the make-up air volume, along the air flow direction, the make-up air assembly further includes an air volume sensor disposed downstream of the heat exchanger. The air volume sensor is electrically connected to the controller.

[0018] Preferably, the controller is also electrically connected to a water heating device. In this way, the controller controls the water heating device to realize the automatic control of the make-up air process in the kitchen.

[0019] Preferably, a circulation pump is provided in the water heating device, or a circulation pump is provided in at least one of the first pipe and the second pipe.

[0020] Preferably, the water heating device is a gas water heater, an electric water heater, an air source heat pump water heater or a solar water heater.

[0021] The technical solution adopted by the present invention to solve the above second technical problem is: a make-up air method using the kitchen make-up air system as described above, which is characterized by including the following steps:

[0022] Step 1: Turn on the range hood;

[0023] Step 2: Open the make-up air valve;

[0024] Step 3: Determine whether the temperature T1 detected by the first temperature sensor is lower than a preset temperature. If so, go to step 4; if not, do not start the heat exchanger;

[0025] Step 4: Obtain the real-time detected make-up air volume Q0 of the air volume sensor, and calculate the energy W0 required to heat the make-up air according to the make-up air volume Q0 detected by the air volume sensor, the temperature T1 detected by the first temperature sensor, and the set fresh air temperature T2 at the air outlet of the make-up air duct, and adjust the working power W1 of the water heating device in the kitchen according to the energy W0.

[0026] Step 5: Determine whether the range hood is turned off. If so, control the makeup air valve to close; if not, continue to execute Steps 3 and 4 above.

[0027] Preferably, the calculation formula for the energy W in Step 4 is:

[0028] W0 = Q0 * (T2 - T1).

[0029] Preferably, the calculation formula for W1 in Step 4 is:

[0030] W1 = K * W0 = K * Q0 * (T2 - T1)

[0031] where K is the heat transfer coefficient and K > 1.

[0032] Preferably, the value range of K is 1 < K ≤ 1.2.

[0033] Compared with the prior art, the advantages of the present invention are as follows: By setting up a heat exchanger, and connecting the water flow channel inlet of the heat exchanger to the hot water outlet end of the water heating device in the kitchen through the first pipeline, and connecting the water flow channel outlet of the heat exchanger to the inlet end of the water heating device in the kitchen through the second pipeline, the hot water of the water heater is used for heat exchange to heat the fresh air replenished into the kitchen. This heating method can make the temperature field of the heated fresh air more uniform, and fully utilize the function of the existing water heating device in the kitchen, realizing the dual use of one thing, saving energy and having low cost. Therefore, by replenishing fresh air and preheating the replenished fresh air in cold weather, the problem of negative pressure in the kitchen caused by closing doors and windows in cold seasons is solved, and at the same time, the use experience of makeup air is improved, and the comfort is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of a household kitchen in an embodiment of the present invention;

[0035] Figure 2 is Figure 1 an enlarged view of part A in

[0036] Figure 3 is Figure 1 an enlarged view of part B in

[0037] Figure 4 is Figure 1 a schematic structural diagram of the heat exchanger in

[0038] Figure 5 is a control block diagram of the makeup air system in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] AsFigures 1 to 5 As shown in the figure, the make-up air system in this embodiment includes a make-up air component 1. The make-up air component 1 includes a make-up air duct 11. The air inlet 1a of the make-up air duct 11 is connected to a natural air source, and the air outlet 1b of the make-up air duct 11 is connected to the interior of the kitchen. The air inlet 1a of the make-up air duct 11 extends outside the kitchen, that is, the natural air source is the natural air outside the kitchen. In this embodiment, the make-up air duct 11 is placed on the ceiling of the kitchen, but it is not limited to being placed on the ceiling of the kitchen. It can also be in positions such as under the kitchen countertop or in the base cabinet. And there is a cooking appliance 10, an exhaust hood 20 located above the cooking appliance 10, and a water heating device 3 installed on the kitchen wall in the kitchen. The water heating device 3 in this embodiment is a gas water heater, an electric water heater, an air source heat pump water heater, or a solar water heater. The above cooking appliance 10, exhaust hood 20, and water heating device 3 are all existing products and will not be elaborated here.

[0041] As Figures 1 to 3 shown, the make-up air component 1 further includes a heat exchanger 2 located between the air inlet 1a and the air outlet 1b of the make-up air duct 11. The heat exchanger 2 has a water flow channel 21 and an air flow channel 22. The two ends of the air flow channel 22 are respectively connected to the air inlet 1a and the air outlet 1b of the make-up air duct 11. The water inlet 21a of the water flow channel 21 is connected to the hot water outlet end 31 of the water heating device 3 in the kitchen through a first pipe 3a, and the water outlet 21b of the water flow channel 21 is connected to the water inlet end 32 of the water heating device 3 in the kitchen through a second pipe 3b. The above first pipe 3a and second pipe 3b are preferably made of heat-insulating materials. Of course, a blower (not shown in the figure) for realizing active make-up air is also provided in the make-up air duct 11. A filter screen 30 for filtering out impurities is also provided at the air inlet 1a of the make-up air duct 11, and a rain cap 40 is provided at the front end of the air inlet 1a of the make-up air duct 11.

[0042] In addition, as Figure 4 shown, the interior of the heat exchanger 2 in this embodiment is hollow to form the above air flow channel 22. The water flow channel 21 is arranged in a spiral shape on the outer peripheral wall of the heat exchanger 2. Heat exchange fins (not shown in the figure) are provided in the air flow channel 22. The heat exchanger 2 in this embodiment is cylindrical, and it can also be of other shapes. The cross-section of the water flow channel 21 is not limited to shapes such as circular, oval, and polygonal.

[0043] The air supply assembly 1 further includes an air supply valve 12, a first temperature sensor 6, a second temperature sensor 7, an air volume sensor 8 and a controller 4. The air supply valve 12, the first temperature sensor 6, the second temperature sensor 7 and the air volume sensor 8 are all arranged in the air supply duct 11. Along the air flow direction, the first temperature sensor 6 is located upstream of the heat exchanger 2 and adjacent to the air inlet 1a of the air supply duct 11, and is used to detect the temperature of the air supplied from the air inlet 1a of the air supply duct 11; along the air flow direction, the second temperature sensor 7 is located downstream of the heat exchanger 2 and adjacent to the air outlet 1b of the air supply duct 11, and is used to detect the temperature of the air discharged from the air outlet 1b of the air supply duct 11; Figure 2 As shown, the air supply valve 12 is provided between the air supply valve 12 and the heat exchanger 2. Along the air flow direction, the air volume sensor 8 is provided downstream of the heat exchanger 2 and adjacent to the heat exchanger 2. Figure 2 The air volume sensor 8 is located upstream of the second temperature sensor 7; and the air supply valve 12, the first temperature sensor 6, the second temperature sensor 7 and the air volume sensor 8 are all electrically connected to the controller 4. The controller 4 is configured to: control the air supply valve 12 to open so that the air supply duct 11 can supply air to the kitchen or control the air supply valve 12 to close so that the air supply duct 11 stops supplying air to the kitchen, and the controller 4 is used to determine whether the air supply needs to be heated according to the detection result of the first temperature sensor 6 and to set the fresh air temperature at the air outlet of the air supply duct and the detection result of the air volume sensor 8 to control the working power of the water heating device 3 accordingly. Its specific working process can be found in the air supply method described below.

[0044] The kitchen air supply system also includes a detection module 5 for detecting the operating status of the range hood 20 in the kitchen. This detection module 5 is electrically connected to a controller 4, which controls the linkage between the air supply valve 12 and the range hood 20. The detection module 5 is conventional and will not be described in detail here. Of course, the controller 4 is also electrically connected to the water heating device 3.

[0045] A circulation pump is provided in the water heating device 3 , or in at least one of the first pipe 3 a and the second pipe 3 b , so as to provide circulation power for the water flow channel 21 in the heat exchanger 2 through the circulation pump.

[0046] like Figure 3As shown in the figure, the water heating device 3 in this embodiment is a gas water heater, which is internally provided with a circulation pump 33 and a heat exchanger 34. The hot water outlet end 31 of the water heating device 3 is connected to the first pipeline 3a and the water outlet pipe 2a through a first three-way valve 35. The water inlet end 32 of the water heating device 3 is connected to the second pipeline 3b and the water inlet pipe 2b through a second three-way valve 36. The hot water outlet end 31 of the above-mentioned water heating device 3 is the outlet of the heat exchanger 34, and the water inlet end 32 of the water heating device 3 is the inlet of the heat exchanger 34. The first three-way valve 35 is communicated with the inlet of the heat exchanger 34, and the second three-way valve 36 is communicated with the outlet of the heat exchanger 34. A water flow sensor 37 and an inlet water temperature sensor are also provided at the inlet of the heat exchanger 34. 38, and an outlet water temperature sensor 39 is also provided at the outlet of the heat exchanger 34.

[0047] In this embodiment, a make-up air method applying the above kitchen make-up air system is also disclosed, including the following steps:

[0048] Step 1, turn on the range hood;

[0049] Step 2, open the make-up air valve;

[0050] Step 3, determine whether the temperature T1 detected by the first temperature sensor is lower than the preset temperature. If so, go to step 4; if not, do not start the heat exchanger;

[0051] The preset temperature in this embodiment is 15°, and it can also be set by the user according to actual scenario needs;

[0052] Step 4, obtain the make-up air volume Q0 detected by the air volume sensor in real time, and calculate the energy W0 required for heating and make-up air according to the make-up air volume Q0 detected by the air volume sensor, the temperature T1 detected by the first temperature sensor, and the outlet fresh air temperature T2 of the set make-up air duct, and adjust the working power W1 of the water heating device in the kitchen according to the energy W0;

[0053] The energy W calculation formula is:

[0054] W0 = Q0 * (T2 - T1);

[0055] The calculation formula of W1 is:

[0056] W1 = K * W0 = K * Q0 * (T2 - T1)

[0057] Wherein, K is the heat transfer coefficient, K > 1;

[0058] In this embodiment, the value range of K is 1 < K ≤ 1.2; the value range of the above T2 is: 25°C ≤ T2 ≤ 35°C;

[0059] Step 5: Determine whether the range hood is turned off. If so, control the air supply replenishing valve to close; if not, continue to execute the above-mentioned Step 3 and Step 4.

[0060] In the above air supply replenishing method, when Q0 changes, it is dynamically adjusted through the PID algorithm to ensure constant-temperature air supply replenishing.

[0061] Using the calculation formula in the above air supply replenishing method makes the control of the fresh air temperature simpler, more accurate, with small temperature fluctuations and more energy-saving; due to the extremely high heat transfer efficiency of the cylindrical heat exchanger, according to the law of conservation of energy, the following formula can be obtained:

[0062]

[0063] Wherein, q0 is the water flow rate detected by the water flow sensor 37, t2 is the inlet water temperature detected by the outlet water temperature sensor 39, t1 is the outlet water temperature detected by the inlet water temperature sensor 38, and η is the combustion efficiency of the water heating device 3. Usually, η≥0.85. Therefore, the value range of the heat transfer coefficient K is: 1.0<K≤1.2.

[0064] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A kitchen air supply system, comprising: An air supply assembly (1) comprises an air supply duct (11), an air inlet (1a) of the air supply duct (11) being connected to a natural wind source, and an air outlet (1b) of the air supply duct (11) being connected to the kitchen; The invention is characterized in that: the air supply component (1) also includes a heat exchanger (2) located between the air inlet (1a) and the air outlet (1b) of the air supply duct (11), the heat exchanger (2) having a water flow channel (21) and an air flow channel (22), the two ends of the air flow channel (22) being respectively connected to the air inlet (1a) of the air supply duct (11) and the air outlet (1b) of the air supply duct (11), the water inlet (21a) of the water flow channel (21) being connected to the hot water outlet (31) of the water heating device (3) in the kitchen through a first pipe (3a), and the water outlet (21b) of the water flow channel (21) being connected to the water inlet (32) of the water heating device (3) in the kitchen through a second pipe (3b).

2. The kitchen makeup air system according to claim 1, wherein: The heat exchanger (2) is hollow inside to form the above-mentioned air flow channel (22), and the water flow channel (21) is arranged in a spiral shape on the outer peripheral wall of the heat exchanger (2).

3. The kitchen makeup air system according to claim 2, wherein: Heat exchange fins are provided in the air flow channel (22).

4. The kitchen makeup air system according to any one of claims 1 to 3, characterized in that: The air supply component (1) further comprises an air supply valve (12) arranged in the air supply duct (11) and a controller (4) electrically connected to the air supply valve (12), wherein the controller (4) is configured to control the air supply valve (12) to open so that the air supply duct (11) can supply air to the kitchen, or to control the air supply valve (12) to close so that the air supply duct (11) stops supplying air to the kitchen.

5. The kitchen makeup air system according to claim 4, wherein: The kitchen air supply system further comprises a detection module (5) for detecting the working state of the range hood (20) in the kitchen, wherein the detection module (5) is electrically connected to a controller (4), and the controller (4) is used to control the linkage between the air supply valve (12) and the range hood (20).

6. The kitchen makeup air system according to claim 5, wherein: Along the air flow direction, the air supply component (1) further includes a first temperature sensor (6) located upstream of the heat exchanger (2) and arranged at the air inlet (1a) of the air supply duct (11). The first temperature sensor (6) is electrically connected to the controller (4). The controller (4) is used to determine whether the air supply needs to be heated based on the detection result of the first temperature sensor (6).

7. The kitchen makeup air system according to claim 6, wherein: Along the air flow direction, the air supply component (1) further includes a second temperature sensor (7) located downstream of the heat exchanger (2) and adjacent to the air outlet (1b) of the air supply duct (11), and the second temperature sensor (7) is electrically connected to the controller (4).

8. The kitchen makeup air system according to claim 7, wherein: Along the air flow direction, the air supply component (1) further includes an air volume sensor (8) located downstream of the heat exchanger (2), and the air volume sensor (8) is electrically connected to the controller (4).

9. The kitchen makeup air system according to claim 8, wherein: The controller (4) is also electrically connected to the water heating device (3).

10. The kitchen makeup air system according to claim 9, characterized in that: A circulation pump is provided in the water heating device (3), or a circulation pump is provided in at least one of the first pipe (3a) and the second pipe (3b).

11. The kitchen makeup air system according to claim 10, wherein: The water heating device (3) is a gas water heater, an electric water heater, an air source heat pump water heater or a solar water heater.

12. A make-up air method using the make-up air system according to any one of claims 8 to 11 above, characterized in that It includes the following steps: Step 1: Turn on the range hood. Step 2: Open the air supply valve. Step 3: Determine whether the temperature T1 detected by the first temperature sensor is lower than the preset temperature. If so, go to Step 4; if not, do not start the heat exchanger. Step 4: Obtain the real-time air supply volume Q0 detected by the air volume sensor, and calculate the energy W0 required for heating the air supply according to the air supply volume Q0 detected by the air volume sensor, the temperature T1 detected by the first temperature sensor, and the fresh air temperature T2 at the air outlet of the set air supply duct, and adjust the working power W1 of the water heating device in the kitchen according to the energy W0. Step 5: Determine whether the range hood is turned off. If so, control the air supply valve to close; if not, continue to execute Steps 3 and 4 above.

13. The air supply replenishment method according to claim 12, wherein: The energy W calculation formula in Step 4 is: W0 = Q0 * (T2 - T1).

14. The air make-up method according to claim 13, wherein: The calculation formula for W1 in Step 4 is: W1 = K * W0 = K * Q0 * (T2 - T1) where K is the heat transfer coefficient and K > 1.

15. The air supply replenishment method according to claim 14, characterized in that: The value range of K is 1 < K ≤ 1.2.

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