Kitchen water control system and control method thereof

Abstract

The invention relates to a kitchen water control system and a control method thereof.The kitchen water control system comprises a range hood and a water heater and is characterized by further comprising a first heat exchanger communicated with a smoke exhaust pipe and a second heat exchanger arranged in a water storage tank, and the first heat exchanger and the second heat exchanger are communicated through a pipeline; the first heat exchanger and the second heat exchanger are configured as follows: in a first state, the first heat exchanger is used as an evaporator to absorb heat from oil smoke, and the second heat exchanger is used as a condenser to release energy so as to heat water in the water storage tank; and in the second state, the first heat exchanger is used as a condenser to release energy, and the second heat exchanger is used as an evaporator to absorb heat, so that the water temperature in the water storage tank is reduced. The device has the advantages that on one hand, heat in cooking smoke is recycled to heat water in the water tank, hot water needed by life is provided, the energy utilization rate is increased, and the device is more energy-saving and environment-friendly; on the other hand, the water temperature in the water tank can be reduced, and water use experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household kitchens, and particularly to a kitchen water control system and a control method thereof. Background Art

[0002] In the prior art for kitchen or domestic water, heating is usually carried out by gas or electricity. For example, a Chinese invention patent with the application number CN 202111067908.0 (publication number CN 113757990A) discloses a multifunctional kitchen water heating system and an intelligent control method thereof, including a main unit, a control main board, and a water purification faucet; a water purification heater, a solenoid valve I, and a solenoid valve II are arranged in the main unit. The water inlet end of the water purification heater is connected to a pure water pipeline by the solenoid valve II, the water outlet end is connected to the water purification faucet, and the pure water pipeline is connected to the water purification faucet by the solenoid valve I.

[0003] On the one hand, although the above kitchen water heating system can output high-temperature pure water and high-temperature tap water through the heater, since the water heaters in the prior art usually can only provide hot water and normal-temperature water, but cannot provide cold water; on the other hand, during the cooking process, the range hood is usually used to directly discharge the high-temperature gas generated during cooking in the kitchen to the outside, resulting in waste of resources. Therefore, it is necessary to further improve the prior art. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is in view of the above prior art, and to provide a kitchen water control system that can utilize the heat in the gas discharged by the range hood to heat water and can provide cold water.

[0005] The second technical problem to be solved by the present invention is to provide a control method applied to the above kitchen water control system.

[0006] The technical solution adopted by the present invention to solve the above first technical problem is as follows: A kitchen water control system includes a range hood and a water heater arranged in the kitchen. The air outlet of the range hood is connected to an exhaust pipe. The water heater includes a water storage tank and a heater arranged in the water storage tank. It is characterized in that: it further includes a first heat exchanger communicated with the exhaust pipe and a second heat exchanger arranged in the water storage tank. The first heat exchanger and the second heat exchanger are connected by a pipeline. The first heat exchanger and the second heat exchanger are configured in the following two states:

[0007] In the first state, the first heat exchanger is used as an evaporator to absorb heat from the oil fume in the exhaust pipe, and the second heat exchanger is used as a condenser to release energy to heat the water in the water storage tank;

[0008] In the second state, the first heat exchanger is used as a condenser to release energy, and the second heat exchanger is used as an evaporator to absorb heat to reduce the water temperature in the water storage tank.

[0009] In order to enable the first heat exchanger to both discharge smoke and have a heat exchange function, the interior of the first heat exchanger is hollow to form an air flow channel communicating with the smoke exhaust pipe, and a first flow channel for the heat transfer working medium to flow through is circumferentially arranged on the outer wall of the first heat exchanger around the air flow channel.

[0010] In order to enable the second heat exchanger to ensure the passage of water and have a heat exchange function, the interior of the second heat exchanger is hollow to form a water flow channel for water to pass through, and a second flow channel for the heat transfer working medium to flow through is circumferentially arranged on the outer wall of the second heat exchanger around the water flow channel. The second flow channel and the first flow channel are connected through the above pipeline.

[0011] To improve the heat exchange efficiency, a circulation conveying device is further arranged on the pipeline.

[0012] To avoid heat conduction through the pipeline and thus reduce the heat transfer efficiency of the system, the pipeline is made of heat-insulating material.

[0013] The water heater further includes a water inlet pipe communicating with the water inlet end of the water storage tank and a first water outlet pipe communicating with the water outlet end of the water storage tank. A three-way valve is further arranged on the water inlet pipe, and the three-way valve is communicated with a faucet in the kitchen through a second water outlet pipe.

[0014] The water heater further includes a controller electrically connected to the three-way valve and the circulation conveying device.

[0015] The water heater further includes a first temperature sensor for detecting the water inlet temperature in the water inlet pipe and a second temperature sensor for detecting the water temperature in the water storage tank. The first temperature sensor, the second temperature sensor and the heater are also all electrically connected to the controller.

[0016] The technical solution adopted by the present invention to solve the above second technical problem is: a control method applied to the above kitchen water control system, which is characterized by including: the user selects to set the faucet to the hot water mode or the cold water mode through the controller;

[0017] When the faucet is set to the hot water mode, the controller controls the circulation conveying device to work so that the above first heat exchanger and second heat exchanger are in the first state to heat the water in the water storage tank, so that the water flowing out of the faucet is hot water;

[0018] When the faucet is set to the cold water mode, the controller controls the circulation conveying device to work so that the above first heat exchanger and second heat exchanger are in the second state to cool the water in the water storage tank, so that the water flowing out of the faucet is cold water.

[0019] Preferably, when the faucet is set to the hot water mode, during the process of heating the water in the water storage tank, the following steps are further included:

[0020] Step 1-1: Determine whether the detected temperature value T2 of the second temperature sensor is greater than the first temperature preset value. If so, go to Step 1-2; if not, go to Step 1-5.

[0021] Step 1-2: Determine whether the range hood is in the working state. If so, the range hood continues to work at the current gear and go to Step 1-3; if not, make the range hood work at a low gear and go to Step 1-3.

[0022] Step 1-3: When T0 - T2 is less than or equal to the second temperature preset value, where T0 is the preset water outlet water temperature of the faucet, control the circulating conveying device to stop working and go to Step 1-4.

[0023] Step 1-4: Determine whether it is during the cooking period at this time. If so, the range hood continues to work at the current gear and end; if not, the range hood stops working and end.

[0024] Step 1-5: Start the heater to work and go to Step 1-3.

[0025] Preferably, when the faucet is set to the hot water mode, the value range of T0 is: 30°C ≤ T0 ≤ 55°C.

[0026] Preferably, when the faucet is set to the cold water mode, the following steps are further included:

[0027] Step 1-a: Determine whether the detected temperature values of the first temperature sensor and the second temperature sensor are both greater than the third temperature preset value. If so, start the cold water mode and go to Step 1-b; if not, the cold water mode is not started and the faucet provides normal temperature water.

[0028] Step 1-b: Control the circulating conveying device to work through the controller so that the above-mentioned first heat exchanger and second heat exchanger are in the second state.

[0029] Step 1-c: Determine whether the range hood is in the working state. If so, the range hood continues to work at the current gear and go to Step 1-d; if not, make the range hood work at a low gear and go to Step 1-d.

[0030] Step 1-d: When T2 - T0 is greater than or equal to the fourth temperature preset value, control the circulating conveying device to stop working and go to Step 1-e.

[0031] Step 1-e: Determine whether it is during cooking. If so, the range hood continues to operate at the current gear and the process ends; if not, the range hood stops operating and the process ends.

[0032] Preferably, when the faucet is set to the cold water mode, the value range of T0 is: 20°C ≤ T0 ≤ 25°C.

[0033] Preferably, the user also selects to set the faucet to the anti-freezing mode through the controller. When the faucet is set to the anti-freezing mode, if the detected temperature of the second temperature sensor is lower than the first temperature threshold, the heater is started to heat; if the detected temperature of the second temperature sensor is higher than the second temperature threshold, the heater is turned off.

[0034] Compared with the prior art, the advantages of the present invention are as follows: By arranging the first heat exchanger in the exhaust pipe of the range hood and the second heat exchanger in the water storage tank, on the one hand, the heat in the cooking fumes is recovered to heat the water in the tank, providing hot water for daily life, improving the energy utilization rate, and being more energy-saving and environmentally friendly; on the other hand, when cold water is needed, the flow directions of the two heat exchangers are switched to lower the water temperature in the tank, providing water with a suitable temperature for the user and improving the water use experience. Therefore, the control system has a more compact structure, saves space, reduces costs, and has higher reliability. Description of the Drawings

[0035] Figure 1 is a schematic diagram of the kitchen water heating system in the embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of the kitchen water cooling system in the embodiment of the present invention;

[0037] Figure 3 is Figure 1 a schematic structural diagram of the first heat exchanger and the second heat exchanger in

[0038] Figure 4 is a flowchart of the kitchen water control method in the embodiment of the present invention. Detailed Embodiments

[0039] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0040] As Figures 1 to 3 shown, the kitchen water control system in this embodiment includes a range hood 1 and a water heater 2 installed in the kitchen. The air outlet of the range hood 1 is connected to an exhaust pipe 3. The water heater 2 includes a water storage tank 21 and a heater 22 installed in the water storage tank 21.

[0041] The kitchen water control system further includes a first heat exchanger 41 connected to the exhaust pipe 3 and a second heat exchanger 42 disposed in the water storage tank 21. The first heat exchanger 41 and the second heat exchanger 42 are connected by a pipeline a. The first heat exchanger 41 and the second heat exchanger 42 are configured in the following two states: in the first state, the first heat exchanger 41 is used as an evaporator to absorb heat from the oil fume in the exhaust pipe 3, and the second heat exchanger 42 is used as a condenser to release energy to heat the water in the water storage tank 21; in the second state, the first heat exchanger 41 is used as a condenser to release energy, and the second heat exchanger 42 is used as an evaporator to absorb heat to reduce the water temperature in the water storage tank 21.

[0042] The inside of the first heat exchanger 41 is hollow to form an air flow channel 411 connected to the exhaust pipe 3. A first flow channel 412 for the heat transfer working medium to flow through is circumferentially arranged around the air flow channel 411 on the outer wall of the first heat exchanger 41. To improve the anti-oil pollution performance of the first heat exchanger 41, its surface is treated by a spraying process, such as a super-hydrophobic nano-coating, etc.; the inside of the second heat exchanger 42 is hollow to form a water flow channel 421 for water to pass through. A second flow channel 422 for the heat transfer working medium to flow through is circumferentially arranged around the water flow channel 421 on the outer wall of the second heat exchanger 42. The second flow channel 422 and the first flow channel 412 are connected by the above pipeline a. As Figure 3 shown, the first flow channel 412 and the second flow channel 422 in this embodiment are both spirally arranged on the outer peripheral wall of the corresponding heat exchanger. Heat exchange fins (not shown in the figure) are provided in the air flow channel 411. The first heat exchanger 41 and the second heat exchanger 42 in this embodiment are cylindrical, and can also be of other shapes. 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 (to accommodate the expansion and contraction of the volume of the heat transfer working medium when the temperature in the system changes); the cross-sections of the first flow channel 412 and the second flow channel 422 are not limited to shapes such as circles, ellipses, and polygons.

[0043] To improve the heat recovery efficiency, the area ratio of the first heat exchanger 41 and the second heat exchanger 42 in the heat transfer system can be adjusted according to the actual application environment, scenario, climate conditions, etc.

[0044] In this embodiment, heat transfer is achieved by the cyclic flow of the heat transfer working medium. To enhance the heat exchange efficiency, a circulation conveying device 5 is also provided on the pipeline a. The circulation conveying device 5 in this embodiment is a circulation pump, which conveys the heat transfer medium to overcome the flow resistance of the system, etc. The above pipeline a is made of a heat-insulating material to prevent heat from being conducted through the pipeline and thus reduce the heat transfer efficiency of the system. In this embodiment, the heat transfer working medium can flow forward and backward in the heat exchange system, which is realized by the forward and reverse rotation of the circulation pump.

[0045] The water heater 2 in this embodiment further includes a water inlet pipe 61 connected to the water inlet end of the water storage tank 21 and a first water outlet pipe 62 connected to the water outlet end of the water storage tank 21. A three-way valve 7 is further provided on the water inlet pipe 61, and the three-way valve 7 is connected to a faucet 8 in the kitchen through a second water outlet pipe 63. In addition, the water heater 2 further includes a controller 9 electrically connected to the three-way valve 7 and the circulating conveying device 5.

[0046] Of course, in order to control the water temperature of the water flowing out of the faucet 8, the water heater 2 in this embodiment further includes a first temperature sensor 101 for detecting the water inlet temperature in the water inlet pipe 61 and a second temperature sensor 102 for detecting the water temperature in the water storage tank 21. The first temperature sensor 101, the second temperature sensor 102 and the heater 22 are also electrically connected to the controller 9.

[0047] As Figure 4 shown, the control method of the above kitchen water control system applied in this embodiment includes: the user selects to set the faucet to the hot water mode or the cold water mode through the controller;

[0048] When the faucet is set to the hot water mode, the controller controls the circulating conveying device to work so that the above first heat exchanger and second heat exchanger are in the first state to heat the water in the water storage tank, so that the water flowing out of the faucet is hot water;

[0049] When the faucet is set to the hot water mode, during the process of heating the water in the water storage tank, the following steps are further included:

[0050] Step 1-1: Determine whether the detected temperature value T2 of the second temperature sensor is greater than the first temperature preset value. If so, go to step 1-2; if not, go to step 1-5;

[0051] Step 1-2: Determine whether the range hood is in the working state. If so, the range hood continues to work at the current gear and goes to step 1-3; if not, the range hood works at a low gear and goes to step 1-3;

[0052] Step 1-3: When T0 - T2 is less than or equal to the second temperature preset value, where T0 is the preset water outlet water temperature of the faucet, control the circulating conveying device to stop working and go to step 1-4; in this embodiment, when the faucet is set to the hot water mode, the value range of T0 is: 30°C ≤ T0 ≤ 55°C;

[0053] Step 1-4: Determine whether it is during cooking at this time. If so, the range hood continues to work at the current gear and ends; if not, the range hood stops working and ends;

[0054] Step 1-5: Start the heater to work and go to step 1-3;

[0055] When the faucet is set to the cold water mode, the controller controls the operation of the circulating conveying device to make the first heat exchanger and the second heat exchanger in the second state, so as to cool the water in the water storage tank, so that the water flowing out of the faucet is cold water;

[0056] When the faucet is set to the cold water mode, the following steps are further included:

[0057] Step 1-a: Judge whether the detected temperature values of the first temperature sensor and the second temperature sensor are both greater than the third temperature preset value. If so, start the cold water mode and go to step 1-b; if not, the cold water mode is not started, and the faucet provides normal temperature water;

[0058] Step 1-b: The controller controls the operation of the circulating conveying device to make the first heat exchanger and the second heat exchanger in the second state;

[0059] Step 1-c: Judge whether the range hood is in the working state. If so, the range hood continues to work at the current gear and goes to step 1-d; if not, make the range hood work at a low gear and go to step 1-d;

[0060] Step 1-d: When T2 - T0 is greater than or equal to the fourth temperature preset value, control the circulating conveying device to stop working and go to step 1-e; in this embodiment, when the faucet is set to the cold water mode, the value range of T0 is: 20°C ≤ T0 ≤ 25°C;

[0061] Step 1-e: Judge whether it is during cooking at this time. If so, the range hood continues to work at the current gear and ends; if not, the range hood stops working and ends.

[0062] In addition, the user also selects to set the faucet to the anti-freezing mode through the controller. When the faucet is set to the anti-freezing mode, if the detected temperature of the second temperature sensor is lower than the first temperature threshold, start the heater to heat; if the detected temperature of the second temperature sensor is higher than the second temperature threshold, turn off the heater.

[0063] In this embodiment, first, the user selects the hot water mode, cold water mode or anti-freezing function through the water temperature controller according to needs, and detects the current water temperature through the second temperature sensor. The control program controls the normal operation of the system according to the difference between the current water temperature and the target water temperature of the corresponding mode. ① If the user turns on the range hood for normal cooking at this time, then the heat in the exhausted cooking fumes is recovered by this control system to heat or cool the water in the water storage tank until the water temperature reaches the water temperature of the selected mode. ② If the water temperature still does not meet the temperature corresponding to the set mode after the user finishes cooking, such as the selected hot water mode or anti-freezing function, the heater is started for auxiliary heating until the water temperature reaches the water temperature corresponding to the selected mode, and then the heater is stopped. ③ Usually, the user will select the cold water mode on hot summer days. When working in this mode, if the water temperature does not reach the set water temperature, the range hood will run at a low gear all the time until the water temperature reaches the set value. During this process, if the user wants to perform cooking operations, the gear of the range hood gives priority to the gear selected by the user, and automatically jumps to the low gear operation after cooking, making the system more energy-efficient.

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

Claims

1. A kitchen water control system, comprising an oil fume extractor (1) and a water heater (2) provided in the kitchen. The air outlet of the oil fume extractor (1) is connected to a smoke exhaust pipe (3). The water heater (2) includes a water storage tank (21) and a heater (22) provided in the water storage tank (21), and is characterized in that: It further includes a first heat exchanger (41) communicated with the smoke exhaust pipe (3) and a second heat exchanger (42) disposed in the water storage tank (21). The first heat exchanger (41) and the second heat exchanger (42) are communicated through a pipeline (a). The first heat exchanger (41) and the second heat exchanger (42) are configured in the following two states: In the first state, the first heat exchanger (41) is used as an evaporator to absorb heat from the oil fume in the smoke exhaust pipe (3), and the second heat exchanger (42) is used as a condenser to release energy to heat the water in the water storage tank (21); In the second state, the first heat exchanger (41) is used as a condenser to release energy, and the second heat exchanger (42) is used as an evaporator to absorb heat to reduce the water temperature in the water storage tank (21).

2. The kitchen water control system according to claim 1, wherein: The interior of the first heat exchanger (41) is hollow to form an air flow channel (411) communicated with the smoke exhaust pipe (3). A first flow channel (412) for the heat transfer working medium to flow through is circumferentially arranged on the outer wall of the first heat exchanger (41) around the air flow channel (411).

3. The kitchen water control system according to claim 2, characterized in that: The interior of the second heat exchanger (42) is hollow to form a water flow channel (421) for water to pass through. A second flow channel (422) for the heat transfer working medium to flow through is circumferentially arranged on the outer wall of the second heat exchanger (42) around the water flow channel (421). The second flow channel (422) and the first flow channel (412) are communicated through the above pipeline (a).

4. The kitchen water control system according to any one of claims 1 to 3, characterized in that: A circulation conveying device (5) is further arranged on the pipeline (a).

5. The kitchen water control system according to claim 4, wherein: The pipeline (a) is made of heat-insulating material.

6. The kitchen water control system according to claim 4, wherein: The water heater (2) further includes a water inlet pipe (61) communicated with the water inlet end of the water storage tank (21) and a first water outlet pipe (62) communicated with the water outlet end of the water storage tank (21). A three-way valve (7) is further arranged on the water inlet pipe (61). The three-way valve (7) is communicated with a faucet (8) in the kitchen through a second water outlet pipe (63).

7. The kitchen water control system according to claim 6, wherein: The water heater (2) further includes a controller (9) electrically connected to the three-way valve (7) and the circulation conveying device (5).

8. The kitchen water control system according to claim 7, wherein: The water heater (2) further includes a first temperature sensor (101) for detecting the water temperature of the water inlet in the water inlet pipe (61) and a second temperature sensor (102) for detecting the water temperature in the water storage tank (21). The first temperature sensor (101), the second temperature sensor (102) and the heater (22) are also electrically connected to the controller (9).

9. A control method for a kitchen water control system using the system as described in claim 8 above, characterized in that Including: The user selects to set the faucet to the hot water mode or the cold water mode through the controller; When the faucet is set to the hot water mode, the controller controls the circulation conveying device to work so that the above-mentioned first heat exchanger and second heat exchanger are in the first state to heat the water in the water storage tank, so that the water flowing out of the faucet is hot water; When the faucet is set to the cold water mode, the controller controls the circulation conveying device to work so that the above-mentioned first heat exchanger and second heat exchanger are in the second state to cool the water in the water storage tank, so that the water flowing out of the faucet is cold water.

10. The control method according to claim 9, wherein: When the faucet is set to the hot water mode, during the process of heating the water in the water storage tank, the following steps are further included: Step 1-1: Determine whether the detected temperature value T2 of the second temperature sensor is greater than the first temperature preset value. If so, proceed to Step 1-2; if not, proceed to Step 1-5. Step 1-2: Determine whether the range hood is in the working state. If so, the range hood continues to work at the current gear and proceeds to Step 1-3; if not, the range hood works at a low gear and proceeds to Step 1-3. Step 1-3: When T0 - T2 is less than or equal to the second temperature preset value (where T0 is the preset water outlet water temperature of the faucet), control the circulating conveying device to stop working and proceed to Step 1-4. Step 1-4: Determine whether it is during the cooking period at this time. If so, the range hood continues to work at the current gear and ends; if not, the range hood stops working and ends. Step 1-5: Start the heater to work and proceed to Step 1-3.

11. The control method according to claim 10, characterized in that: When the faucet is set to the hot water mode, the value range of T0 is: 30°C ≤ T0 ≤ 55°C.

12. The control method according to claim 11, wherein: When the faucet is set to the cold water mode, the following steps are further included: Step 1-a: Determine whether the detected temperature values of the first temperature sensor and the second temperature sensor are both greater than the third temperature preset value. If so, start the cold water mode and proceed to Step 1-b; if not, the cold water mode is not started, and the faucet provides normal temperature water. Step 1-b: Control the circulating conveying device to work through the controller so that the above-mentioned first heat exchanger and second heat exchanger are in the second state. Step 1-c: Determine whether the range hood is in the working state. If so, the range hood continues to work at the current gear and proceeds to Step 1-d; if not, the range hood works at a low gear and proceeds to Step 1-d. Step 1-d: When T2 - T0 is greater than or equal to the fourth temperature preset value, control the circulating conveying device to stop working and proceed to Step 1-e. Step 1-e: Determine whether it is during the cooking period at this time. If so, the range hood continues to work at the current gear and ends; if not, the range hood stops working and ends.

13. The control method according to claim 12, wherein: When the faucet is set to the cold water mode, the value range of T0 is: 20°C ≤ T0 ≤ 25°C.

14. The control method according to any one of claims 9 to 13, characterized in that: The user also selects to set the faucet to the anti-freezing mode through the controller. When the faucet is set to the anti-freezing mode, if the detected temperature of the second temperature sensor is lower than the first temperature threshold, start the heater to heat; if the detected temperature of the second temperature sensor is higher than the second temperature threshold, turn off the heater.

Images