A steam generator water replenishment control system, method and cooking device

Abstract

The present invention provides a water replenishment control system for a steam generator, which includes a water tank, a water level detection unit, a feed water pump, a steam generator temperature detection unit, a water replenishment controller, and a steam generator body; the water level detection unit is fixed on the water tank; the feed water pump is connected between the water tank and the steam generator body through a water pipe; the steam generator temperature detection unit is fixed on the steam generator body; the water level detection unit, the feed water pump, and the steam generator temperature detection unit are all electrically connected to the water replenishment controller. The present invention also provides a method for the above control system, enabling the steam generator to have sufficient water during operation, and after cooking ends, there will be no excessive residual water inside the steam generator, saving water resources and not generating peculiar smells or scale. The present invention further provides a cooking device using the above water replenishment control system for the steam generator.

Description

Technical Field

[0001] The present invention belongs to the technical field of cooking devices, and particularly relates to a water replenishment control system, method and cooking device for a steam generator. Background Art

[0002] Electric steamers, steam ovens, etc. are cooking devices often used in people's daily lives, and the steam generator is an important component among them. The water injection control logic of the steam generator in the prior art is as follows: when it is detected that the water level inside the steam generator is too low or there is no water and dry burning starts, the water pump is started to inject a certain amount of water from the water tank into the steam generator to complete this water injection; until the steam generator dries out again, water is injected again. Each water injection is a passive waiting for the steam generator to dry out. Since no steam is generated during dry burning, the temperature inside the steam box cavity will drop at this time, which will affect the cooking effect of the ingredients and the user experience is poor. On the other hand, when too much water is injected, after cooking ends, there will be more residual water inside the steam generator, and the residual water will produce a deteriorated odor and scale, affecting the health of the user. Summary of the Invention

[0003] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a water replenishment control system, method and cooking device for a steam generator, to realize intelligent water replenishment of the steam generator, ensure sufficient water supply for the steam generator and at the same time not generate too much residual water.

[0004] To achieve the above purpose, the present invention first provides a water replenishment control system for a steam generator, including a water tank, a water level detection unit, a water supply pump, a steam generator temperature detection unit, a water replenishment controller and a steam generator body; the water level detection unit is fixed on the water tank; the water supply pump is connected between the water tank and the steam generator body through a water pipe; the steam generator temperature detection unit is fixed on the steam generator body; the water level detection unit, the water supply pump and the steam generator temperature detection unit are all electrically connected to the water replenishment controller.

[0005] Further, it also includes a temperature controller, which is fixed on the steam generator body and is electrically connected to the steam generator temperature detection unit.

[0006] Further, the temperature controller includes a snap-action overheat protector for stopping or starting the operation of the steam generator.

[0007] Further, it also includes a steam box temperature detection unit, which is fixed on the steam box cavity.

[0008] The present invention also provides a water replenishment control method for the above-mentioned water replenishment control system of the steam generator, including the following steps:

[0009] S1, the steam generator operates;

[0010] S2. The steam generator temperature detection unit detects the internal temperature of the steam generator body. When the internal temperature reaches the set dry-burning temperature value, it is determined that the steam generator body has a first dry-burning, and step S3 is entered; otherwise, the internal temperature is continuously detected.

[0011] S3. The water tank injects water into the steam generator body, and the steam generator continues to heat. The steam generator temperature detection unit detects the internal temperature of the steam generator body again. When the internal temperature reaches the set dry-burning temperature value again, it is determined that the steam generator body has a second dry-burning, and step S4 is entered; otherwise, the internal temperature is continuously detected.

[0012] S4. The water replenishment controller analyzes the water level information of the water tank detected by the water level detection unit during the two dry-burnings, and calculates the water consumption speed of the steam generator body during the interval between the two dry-burnings; the water replenishment controller adjusts the water injection speed of the water tank into the steam generator body to make it not less than the water consumption speed.

[0013] Further, the bottom area of the water tank is S, the difference in the water tank water level detected by the water level detection unit during the two dry-burnings is H, the interval time between the two dry-burnings is T, and the water consumption speed is V, then V = H * S / T.

[0014] Further, the water replenishment controller controls the water injection speed of the water tank into the steam generator body by adjusting the working load of the water pump.

[0015] Further, the set range of the dry-burning temperature value is 120 - 130 °C.

[0016] Further, when the internal temperature of the steam generator body exceeds the protection temperature, the steam generator body stops heating and resumes heating after the temperature drops to the normal working value; the protection temperature is 180 - 220 °C.

[0017] The present invention also provides a cooking device, including a cooking device body and the above steam generator water replenishment control system, and the steam generator water replenishment control system is located inside the cooking device body.

[0018] Compared with the prior art, the steam generator water replenishment control system, method and cooking device provided by the present invention detect two dry-burnings of the steam generator through the steam generator temperature detection unit, and then the water replenishment controller analyzes the water level information of the water tank detected by the water level detection unit during the two dry-burnings, and calculates the water consumption speed of the steam generator body during the interval between the two dry-burnings; the water replenishment controller adjusts the water injection speed of the water tank into the steam generator body to make the water injection speed slightly greater than the water consumption speed. In this way, it can ensure that there is sufficient water in the steam generator during the next operation, and after the cooking is over, there will be no excessive residual water inside the steam generator, saving water resources and not generating peculiar smells and scale. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the steam generator water replenishment control system provided by Embodiment 1 of the present invention;

[0020] Figure 2 It is a connection relationship diagram of the steam generator water replenishment control system provided by Embodiment 1 of the present invention;

[0021] Figure 3 It is a flowchart of the steam generator water replenishment control method provided by Embodiment 2 of the present invention;

[0022] Figure 4 It is a control logic diagram of the water volume of the steam generator in Embodiment 2 of the present invention;

[0023] Figure 5 It is a temperature curve diagram of the steam generator water replenishment control system in Embodiment 2 of the present invention; Detailed implementation manners

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Embodiment 1:

[0026] Embodiment 1 of the present invention provides a steam generator water replenishment control system. As shown in Figure 1 and 2 , it includes a water tank 1, a water level detection unit, a feed water pump 3, a steam generator temperature detection unit, a water replenishment controller 5 and a steam generator body 6; in this embodiment, the water level detection unit is preferably a water level sensor 2, and the steam generator temperature detection unit is preferably a steam generator temperature sensor; the water level sensor 2 is fixed on the water tank 1; the feed water pump 3 is connected between the water tank 1 and the steam generator body 6 through a water pipe; the steam generator temperature sensor 4 is fixed on the steam generator body 6; the water level sensor 2, the feed water pump 3 and the steam generator temperature sensor 4 are all electrically connected to the water replenishment controller 5.

[0027] With the above structure, the steam generator temperature sensor 4 detects and determines that the steam generator body 6 has experienced two dry burns. Then, the water replenishment controller 5 analyzes the water level information of the water tank 1 detected by the water level sensor 2 during the two dry burns, and calculates the water consumption speed of the steam generator body 6 during the interval between the two dry burns. The water pump 3 pumps the water in the water tank 1 into the steam generator body 6. The water replenishment controller 5 adjusts the working load of the water pump 3, thereby controlling the water injection speed of the water tank 1 into the steam generator body 6. Then, the water injection speed is set to be equal to or slightly greater than the water consumption speed, so that sufficient water can be continuously supplied to the steam generator body 6, and after cooking, there will be no excessive residual water inside the steam generator body 6.

[0028] The first embodiment also includes a thermostat 7 and a steam box temperature sensor 8. The thermostat 7 is fixed on the steam generator body 6 and is electrically connected to the steam generator temperature sensor 4. The steam generator temperature sensor 4 transmits the detected temperature signal to the thermostat 7. The thermostat 7 includes a snap-action overheat protector, which functions to provide overheat protection for the steam generator body 6. When a fault occurs and the steam generator body 6 is continuously dry burned without replenishing water for a long time, and the temperature rises to 200 °C, the snap-action overheat protector trips, causing the steam generator body 6 to stop heating and dry burning. When the fault is eliminated and the temperature drops to the specified value, the snap-action overheat protector can resume the heating operation of the steam generator body 6.

[0029] The steam box temperature sensor 8 is fixed on the steam box cavity 9. When the steam generator body 6 is dry burning, it cannot generate enough steam to enter the inside of the steam box cavity 9, resulting in the temperature of the steam box cavity 9 starting to drop. By detecting the temperature information of the steam box cavity 9 through the steam box sensor 8, it is also possible to determine whether the steam generator body 6 is dry burning.

[0030] Embodiment Two:

[0031] The second embodiment of the present invention provides a steam generator water replenishment control method for the steam generator water replenishment control system in the first embodiment, as Figure 3 and 4 shown, including the following steps:

[0032] S1, the steam generator operates;

[0033] S2, the steam generator temperature sensor 4 detects the internal temperature of the steam generator body 6. When the internal temperature reaches the set dry burn temperature value, it is determined that the steam generator body 6 has its first dry burn, and enters step S3; otherwise, continue to detect the internal temperature;

[0034] S3. The water tank 1 injects water into the interior of the steam generator body 6. The steam generator continues to heat up. The steam generator temperature sensor 4 detects the interior temperature of the steam generator body 6 again. When the interior temperature reaches the set dry-burning temperature value again, it is determined that the steam generator body 6 is dry-burning again, and step S4 is entered; otherwise, the interior temperature is continuously detected.

[0035] S4. The water replenishment controller 5 analyzes the water level information of the water tank 1 detected by the water level sensor 2 during the two dry-burnings, and calculates the water consumption speed of the steam generator body 6 during the interval between the two dry-burnings. The water replenishment controller 5 adjusts the water injection speed of the water tank 1 into the steam generator body 6 so that it is not less than the water consumption speed.

[0036] Among them, the calculation method of the water consumption speed is as follows:

[0037] The bottom area of the water tank is S. The water level values of the water tank 1 detected by the water level sensor 2 at the first dry-burning and the second dry-burning are H0 and H1 respectively. The water level difference H of the water tank 1 between the two dry-burnings is H = H0 - H1. The interval time between the two dry-burnings is T, and the water consumption speed is V. Then V = H * S / T.

[0038] The water replenishment controller 5 adjusts the working load of the water supply pump 3. The water injection speed is V'. Make V' equal to or slightly greater than V. In this way, enough water can be continuously replenished for the steam generator body 6, and excessive remaining water will not be generated, wasting water resources.

[0039] The set range of the dry-burning temperature value is 120 - 130 °C, and this embodiment preferably uses 125 °C.

[0040] In the second embodiment, the temperature change curves of the interior of the steaming chamber 9, the steam generator body 6, and the steam outlet are as Figure 5 shown. A is the temperature curve of the interior of the steaming chamber 9, B is the temperature curve of the steam outlet, C is the temperature curve of the interior of the steam generator body 6, and D is the water injection timing curve of the water supply pump 3. During the dry-burning and water injection processes, there will be two modes of temperature drops at the steam outlet of the steam generator body 6, namely mode ① and mode ②, which are reflected as two troughs in Figure 5 . During the dry-burning process of the steam generator body 6, no steam is generated, as shown in mode ① in the figure; during the water injection process, the temperature of the water in the steam generator body 6 will drop. When it drops below the boiling point, no steam is generated at this time, as shown in mode ② in the figure.

[0041] When the interior temperature of the steam generator body 6 exceeds the protection temperature, the steam generator body 6 will stop heating and resume heating after the temperature drops to the normal working value. The protection temperature is 180 - 220 °C, and this embodiment preferably uses 200 °C.

[0042] Embodiment Three:

[0043] Embodiment 3 of the present invention further provides a cooking device, including a cooking device body and the steam generator water replenishment control system in Embodiment 1, and the steam generator water replenishment control system is located inside the cooking device body.

[0044] The cooking device in this embodiment includes, but is not limited to, a steam box, a steam oven and grill combination, etc.

[0045] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A water replenishment control method for a steam generator, which is used for a steam generator water replenishment control system, and is characterized in that, The described steam generator make-up water control system includes a water tank, a water level detection unit, a feed water pump, a steam generator temperature detection unit, a make-up water controller, and a steam generator body; the water level detection unit is fixed on the water tank; the feed water pump is connected between the water tank and the steam generator body through a water pipe; the steam generator temperature detection unit is fixed on the steam generator body; the water level detection unit, the feed water pump, and the steam generator temperature detection unit are all electrically connected to the make-up water controller; The specific control method includes the following steps: S1, the steam generator operates; S2, the steam generator temperature detection unit detects the internal temperature of the steam generator body. When the internal temperature reaches the set dry-burning temperature value, it is determined that the steam generator body has dry-burned for the first time, and step S3 is entered; otherwise, the internal temperature is continuously detected; S3, the water tank injects water into the steam generator body, the steam generator continues to heat, and the steam generator temperature detection unit detects the internal temperature of the steam generator body again. When the internal temperature reaches the set dry-burning temperature value again, it is determined that the steam generator body has dry-burned again, and step S4 is entered; otherwise, the internal temperature is continuously detected; S4, the make-up water controller analyzes the water level information of the water tank detected by the water level detection unit during the two dry-burns, and calculates the water consumption speed of the steam generator body during the interval between the two dry-burns; the make-up water controller adjusts the water injection speed of the water tank into the steam generator body to make it not less than the water consumption speed.

2. The steam generator water replenishment control method according to claim 1, characterized in that: The bottom area of the water tank is S, the difference in the water level of the water tank detected by the water level detection unit during the two dry-burns is H, the interval time between the two dry-burns is T, and the water consumption speed is V, then V = H * S / T.

3. The water replenishment control method of the steam generator according to claim 1, characterized in that: The make-up water controller controls the water injection speed of the water tank into the steam generator body by adjusting the working load of the feed water pump.

4. The steam generator water replenishment control method according to any one of claims 1-3, characterized in that: The set range of the dry-burning temperature value is 120 - 130 °C.

5. The steam generator water replenishment control method according to any one of claims 1-3, characterized in that: When the internal temperature of the steam generator body exceeds the protection temperature, the steam generator body stops heating and resumes heating after the temperature drops to the normal working value; the protection temperature is 180 - 220 °C.

6. The steam generator water replenishment control method according to claim 1, characterized in that: It also includes a temperature controller, which is fixed on the steam generator and is electrically connected to the steam generator temperature detection unit.

7. The water replenishment control method of the steam generator according to claim 6, characterized in that: The temperature controller includes a snap-action overheat protector for stopping or starting the operation of the steam generator.

8. The steam generator make-up water control method according to claim 1, characterized in that: It also includes a steam box temperature detection unit, which is fixed on the steam box cavity.

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