Heat source power-on and power-off method and device, heating device and cooking appliance having the same

Abstract

The present invention provides a heat source power-off method and device, and a heating device and cooking appliance equipped therewith. The method comprises the following steps: S1: determining whether the heating chamber temperature T has risen to a first set temperature T1; S2: if so, shutting off all first heating relays, wherein each set of indoor heat sources in the heating device corresponds to at least one set of the first heating relays in series; if not, returning to step S1; S3: determining whether the heating chamber temperature T has risen to a second set temperature T2, wherein T2>T1; S4: if so, shutting off the second heating relay that controls the heating device in series; if not, returning to step S3; S5: activating a third steam relay for controlling the steam heater to power on and heat up, thereby operating a thermostat to shut off the appliance power, or shutting off only the heat source power to all indoor heat sources. The heat source power-off method and device, and the heating device and cooking appliance equipped therewith, according to the present invention, prevent abnormal overcurrent from occurring when power is shut off to the heat source.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking appliances, and in particular to a method and device for switching on and off a heat source, and a heating device and a cooking appliance having the same. Background Art

[0002] When the temperature in the heating chamber of a cooking appliance exceeds a specified temperature, it is desirable to safely shut off the heat source as quickly as possible. However, it is undesirable that the heat source be shut off by a fuse that blows due to excessive current.

[0003] In the prior art, when the temperature in the heating chamber rises to a certain temperature, the cooking appliance will determine that a short circuit has occurred due to a heating relay that has been turned off. Then, the steam heater on the steam generator outside the heating chamber will be powered on, and the power supply to the cooking appliance will be cut off by the thermostat that is activated by the rising temperature of the steam heater.

[0004] However, under the above-mentioned cut-off method, if individual heating relays are short-circuited and individual heaters and steam heaters are turned on at the same time, the cooking appliance may very likely experience abnormal overcurrent due to the rated power of the cooking appliance, and the external connection parts of the cooking appliance, such as sockets and wires, may generate abnormal heat, putting the user in danger. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is: the first aspect is to provide a heat source power-on cutting-off method, so that when the heat source power-on cutting-off device cuts off the power to the heat source, no abnormal overcurrent will occur, thereby ensuring that the operation of the electrical equipment is safer and more reliable.

[0006] To solve the above-mentioned technical problem in the first aspect, the present invention provides a method for cutting off power to a heat source, comprising the following steps:

[0007] S1: Determine whether the heating chamber temperature T rises to the first set temperature T1;

[0008] S2: If yes, turn off all first heating relays, wherein each group of indoor heat sources of the heating device corresponds to at least one group of the first heating relays in series; if no, return to step S1;

[0009] S3: Determine whether the heating chamber temperature T rises to a second set temperature T2, where T2>T1;

[0010] S4: If yes, turn off the second heating relay that controls the heating device in series; if no, return to step S3;

[0011] S5: Turn on the third steam relay for controlling the steam heater to be powered on and heated, so that the thermostat operates to cut off the power supply to the electrical appliances, or only cuts off the power supply to the heat sources of all indoor heat sources.

[0012] The technical problem to be solved by the present invention is also: the second aspect provides a heat source power-off device, and / or the third aspect provides a heating device, and / or the fourth aspect provides a cooking appliance, so that when the heat source power-off device cuts off the power to the heat source, no abnormal overcurrent will occur, thereby ensuring that the operation of the electrical equipment is safer and more reliable.

[0013] In order to solve the technical problem of the second aspect mentioned above, the present invention provides a heat source power-on and power-off device for controlling the cut-off of indoor heat sources, wherein the indoor heat sources are distributed in multiple groups in parallel and use the heat source power-on and power-off method described in any embodiment of the first aspect.

[0014] Preferably, the indoor heat source is an upper heating pipe and a lower heating pipe distributed in parallel.

[0015] Preferably, the heat source power-on cut-off device comprises:

[0016] The indoor heat source control circuit is switched on and off by a second heating relay, one end of the second heating relay is connected in series with the indoor heat source, and the other end is connected in series with the thermostat, wherein the upper heating tube and the lower heating tube are also connected in series with at least one corresponding set of first heating relays;

[0017] The heat source energizes and cuts off the circuit, comprising a steam heater, a third steam relay, and the thermostat connected in series.

[0018] Preferably, the heat source power-on cut-off device comprises:

[0019] The indoor heat source control circuit is controlled by a second heating relay for on-off control, one end of the second heating relay is connected in series with the indoor heat source, and the other end is connected in series with the thermostat, wherein the front end of the upper heating tube is connected in series with the first group of first heating relays, and the front end of the lower heating tube is connected in series with the second group of first heating relays;

[0020] The heat source power-on and power-off circuit includes the thermostat, and also includes a steam heater and a first group of third steam relays, which are arranged in series in sequence at the rear end of the first group of first heating relays and the front end of the upper heating tube. The first group of first heating relays and the first group of third steam relays together constitute the third steam relay.

[0021] Preferably, the heat source power-on cut-off device further comprises:

[0022] The inverter circuit is arranged in parallel with the main control circuit, wherein the main control circuit includes the indoor heat source control circuit and the heat source power-on and power-off circuit.

[0023] Preferably, the first heating relay, the second heating relay, and the third steam relay are all connected to and arranged on a control substrate.

[0024] Preferably, the heating method of the indoor heat source includes microwave heating.

[0025] In order to solve the technical problem in the third aspect mentioned above, the present invention provides a heating device having the heat source power-on and power-off device described in any embodiment of the second aspect.

[0026] In order to solve the technical problem in the fourth aspect mentioned above, the present invention provides a cooking appliance having the heat source power-on and power-off device described in any embodiment of the second aspect.

[0027] Compared with the prior art, the heat source power-on and power-off method, heat source power-on and power-off device, heating device, and cooking appliance of the present invention have the following beneficial effects:

[0028] This ensures that when the heat source power-off device cuts off the power to the heat source, no abnormal overcurrent will occur, thereby ensuring that the operation of the electrical equipment is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of a cooking appliance according to a specific embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the circuit structure of a heat source power-on cut-off device in a cooking appliance according to Example 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of the circuit structure of a heat source power-on cut-off device in a cooking appliance according to Example 2 of the present invention;

[0033] Figure 4 This is a schematic diagram of the circuit structure of a heat source power-on cut-off device in a cooking appliance described in Example 3 of the present invention.

[0034] Description of reference numerals:

[0035] 1-Heating chamber, 2-Heating device, 21-Upper heating tube, 22-Lower heating tube, 3-Steam generator, 31-Steam heater, 32-Thermostat, 41-First heating relay, 411-First group of first heating relays, 412-Second group of first heating relays, 42-Second heating relay, 43-Third steam relay, 431-First group of third steam relays, 5-Control substrate. DETAILED DESCRIPTION

[0036] To make the above-mentioned objectives, technical solutions and advantages of the present invention more clearly understood, 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 of the present invention described herein only constitute part of the embodiments of the present invention, which are only used to explain the present invention and do not constitute a limitation of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] See also Figure 1 The figure is a schematic diagram of the three-dimensional structure of a cooking appliance according to the present invention, wherein the cooking appliance includes a heating chamber 1, a heating device 2 arranged in the heating chamber 1, and a steam generator 3 arranged outside the heating chamber 1. The heating device 2 has multiple sets of indoor heat sources distributed in parallel, and the steam generator 3 is equipped with a steam heater 31 and a thermostat 32.

[0038] Specifically, the heating device 2 may include multiple sets of indoor heat sources arranged in parallel. For example, the heating device 2 may include upper heating pipes 21 and lower heating pipes 22 arranged in parallel. When the multiple sets of indoor heat sources are powered on, the temperature within the heating chamber 1 will rise rapidly. A first thermistor for detecting the heating chamber temperature T may be provided on the wall surface and / or the external air duct within the heating chamber 1. When the heating chamber temperature T detected by the first thermistor rises to a certain temperature, the cooking appliance will control the steam heater 31 to power on and increase the temperature. The thermostat 32, which is activated by the rising temperature of the steam heater 31, will then shut off the power to the cooking appliance. Alternatively, the power to all indoor heat sources, i.e., the heat source of the heating device 2, may be shut off.

[0039] Unlike the prior art, the present invention aims to ensure that all indoor heat sources are effectively disconnected during the aforementioned disconnection process, or more precisely, during the entire period that the steam heater 31 is powered on, thereby preventing abnormal overcurrent from occurring in the cooking appliance. To this end, the present invention proposes a heat source power disconnection method comprising the following steps:

[0040] S1: Determine whether the heating chamber temperature T rises to the first set temperature T1;

[0041] S2: If yes, turn off all first heating relays 41, wherein each group of indoor heat sources of the heating device 2 corresponds in series to at least one group of the first heating relays 41; if no, return to step S1;

[0042] S3: Determine whether the heating chamber temperature T rises to a second set temperature T2, where T2>T1;

[0043] S4: If yes, turn off the second heating relay 42 controlling the heating device 2 in series; if no, return to step S3;

[0044] S5: Turn on the third steam relay 43 for controlling the steam heater 31 to be powered on and heated, so that the thermostat 32 operates to cut off the power supply of the electrical appliances, or only cuts off the power supply of the heat sources of all indoor heat sources.

[0045] Specifically, in the present invention, even if the heating chamber temperature T rises to the second set temperature T2 due to a short circuit of an individual first heating relay 41, when T≥T2, since the second heating relay 42 used to control the heating device 2 in series has been turned off before the third steam relay 43 is turned on, any group of indoor heat sources will not be in the on state at the same time as the steam heater 31.

[0046] Therefore, through the heat source power-off method described in the present invention, when the heat source power-off device cuts off the power to the heat source, abnormal overcurrent will not occur, thereby ensuring that the operation of the electrical equipment is safer and more reliable.

[0047] Of course, it should be specifically noted here that in step S5, the purpose of opening the third steam relay 43 is to energize the steam heater 31 so that it can quickly heat up to the third set temperature T3, and then cut off the power supply of the appliance through the operation of the thermostat 32, or only cut off the power supply of all indoor heat sources. Therefore, during the power-on and heating period of the steam heater 31, the steam generator 3 will not be supplied with water.

[0048] To facilitate further understanding of the technical solutions of this application by those skilled in the art, the present invention will further elaborate on the heat source power-on / off device in the form of embodiments. At the same time, for ease of description, all of the following embodiments of the present invention will be described using the example of "an indoor heat source comprising upper heating pipes 21 and lower heating pipes 22 connected in parallel." However, those skilled in the art will appreciate that the indoor heat source may also have other configurations.

[0049] Example 1

[0050] See also Figure 2 As shown, the present invention provides a heat source power-off device for controlling the cut-off of an indoor heat source, wherein the indoor heat source is an upper heating pipe 21 and a lower heating pipe 22 connected in parallel. The heat source power-off device includes:

[0051] The indoor heat source control circuit is controlled by the second heating relay 42 for on-off control. One end of the second heating relay 42 is connected in series with the indoor heat source, and the other end is connected in series with the thermostat 32. The upper heating tube 21 and the lower heating tube 22 are also connected in series with at least one corresponding set of first heating relays 41.

[0052] The heat source power-on and power-off circuit includes a steam heater 31 , a third steam relay 43 , and the thermostat 32 connected in series.

[0053] For details, see Figure 2 As shown, the first heating relay 41 includes: RL5, which is connected in series to control the power supply of the upper heating tube 21, and RL6, which is connected in series to control the power supply of the lower heating tube 22; the second heating relay 42 is RL1, which controls the power supply of the upper heating tube 21 and the lower heating tube 22; the third steam relay 43 is RL7 and RL8, which are connected in series to both ends of the steam heater 31; after the thermostat 32 is running, Figure 2 The temperature fuse of the steam generator shown in the figure is blown, and the power supply to all indoor heat sources and even electrical appliances will be effectively cut off.

[0054] Of course, if the thermostat 32 is of the type that can automatically reset, when the operating temperature of the thermostat 32 drops below the third set temperature T3, the thermostat 32 can also automatically restore, but the power supply of all indoor heat sources and even electrical appliances will remain in an effectively cut-off state.

[0055] Example 2

[0056] See also Figure 3 As shown, the present invention provides another heat source power-off device for controlling the cut-off of an indoor heat source, wherein the indoor heat source is an upper heating pipe 21 and a lower heating pipe 22 connected in parallel. The heat source power-off device includes:

[0057] The indoor heat source control circuit is controlled by the second heating relay 42 for on-off control. One end of the second heating relay 42 is connected in series with the indoor heat source, and the other end is connected in series with the thermostat 32. The front end of the upper heating tube 21 is connected in series with the first group of first heating relays 411, and the front end of the lower heating tube 22 is connected in series with the second group of first heating relays 412.

[0058] The heat source power-on and power-off circuit includes the thermostat 32, and also includes a steam heater 31 and a first group of third steam relays 431, which are arranged in series in sequence at the rear end of the first group of first heating relays 411 and the front end of the upper heating tube 21. The first group of first heating relays 411 and the first group of third steam relays 431 together constitute the third steam relay 43.

[0059] For details, see Figure 3As shown, the first group of first heating relays 411 is RL5, which is set at the front end of the upper heating tube 21 and the front end of the steam heater 31, and controls the power supply of the upper heating tube 21 and the steam heater 31 together; the second group of first heating relays 412 is RL6, which controls the power supply of the lower heating tube 22 in series; the second heating relay 42 is RL1, which controls the power supply of the upper heating tube 21 and the lower heating tube 22 together; the third steam relay 43 includes RL5 set at the front end of the steam heater 31 and RL7 set at the rear end of the steam heater 31; after the thermostat 32 is running, Figure 3 The temperature fuse of the steam generator shown in the figure is blown, and the power supply to all indoor heat sources and even electrical appliances will be effectively cut off.

[0060] Compared to Example 1, Example 2 omits RL8, which helps reduce the cost of the heat source power-off device. RL5 functions as the first relay when RL1 is in the ON state and as the third relay when RL1 is in the OFF state. Of course, those skilled in the art will also understand that the upper heating tube 21 and the lower heating tube 22 can be interchanged.

[0061] Example 3

[0062] See also Figure 4 As shown, the present invention provides another heat source power-off device for controlling the cut-off of an indoor heat source, wherein the indoor heat source is an upper heating pipe 21 and a lower heating pipe 22 connected in parallel. The heat source power-off device includes:

[0063] The indoor heat source control circuit is controlled by the second heating relay 42 for on-off control. One end of the second heating relay 42 is connected in series with the indoor heat source, and the other end is connected in series with the thermostat 32. The front end of the upper heating tube 21 is connected in series with the first group of first heating relays 411, and the front end of the lower heating tube 22 is connected in series with the second group of first heating relays 412.

[0064] The heat source power-on / off circuit includes the thermostat 32 and further includes a steam heater 31 and a first group of third steam relays 431, which are arranged in series in sequence at the rear end of the first group of first heating relays 411 and the front end of the upper heating tube 21. The first group of first heating relays 411 and the first group of third steam relays 431 together constitute the third steam relay 43.

[0065] The inverter circuit is arranged in parallel with the main control circuit, wherein the main control circuit includes the indoor heat source control circuit and the heat source power-on and power-off circuit.

[0066] For details, see Figure 4As shown, the first group of first heating relays 411 is RL5, which is set at the front end of the upper heating tube 21 and the front end of the steam heater 31, and controls the power supply of the upper heating tube 21 and the steam heater 31 together; the second group of first heating relays 412 is RL6, which controls the power supply of the lower heating tube 22 in series; the second heating relay 42 is RL1, which controls the power supply of the upper heating tube 21 and the lower heating tube 22 together; the third steam relay 43 includes RL5 set at the front end of the steam heater 31 and RL7 set at the rear end of the steam heater 31; after the thermostat 32 is running, Figure 4 The thermal fuse of the steam generator shown in FIG is blown, thereby effectively cutting off the heat source power to all indoor heat sources.

[0067] It should be noted that, compared to Example 3, Example 2 also includes an inverter circuit. However, the limited configuration of Example 2 does not preclude the possibility that the inverter circuit will not include the thermostat 32. Consequently, when the thermostat 32 is operating, the inverter circuit will likely be disconnected, corresponding to the "appliance power supply" in step S5. However, in Example 3, since the main control circuit is provided and the inverter circuit is configured in parallel with the main control circuit, the inverter circuit does not include the thermostat 32. Therefore, when the thermostat 32 is operating, the variable frequency side of the inverter circuit will not be disconnected, corresponding to the "disconnection of only the heat source power to all indoor heat sources" in step S5. Furthermore, in Example 3, it is still possible to restore the heat source power to all indoor heat sources using the variable frequency power supply, ensuring continued use of the cooking appliances.

[0068] Therefore, when the cooking appliance is a product that integrates baking, steaming and microwave heating functions, such as a microwave-steam-bake machine, the functions of the microwave-steam-bake machine can be ensured to be used normally, and the heating method of the indoor heat source of the cooking appliance can include microwave heating.

[0069] Preferably, at least the first heating relay 41 , the second heating relay 42 , and the third steam relay 43 are all connected to and arranged on the control substrate 5 , or the inverter circuit is also connected to and arranged on the control substrate 5 .

[0070] Specifically, the first heating relay 41, the second heating relay 42, and the third steam relay 43 can all be connected to the control substrate 5 for switching control. It should also be noted that this setting is also fully applicable to Example 1 and Example 2.

[0071] When the inverter circuit is also connected to the control substrate 5, corresponding to the "de-energizing only all indoor heat sources" in step S5, the power to the control substrate 5 will not be de-energized when the thermostat 32 is operating, thereby ensuring normal power to the inverter circuit. However, neither Example 1 nor Example 2 can guarantee that the power to the control substrate 5 will not be de-energized.

[0072] Example 4

[0073] See also Figure 1-4 As shown, the present invention also provides a heating device having the heat source power-on and power-off device described in any one of embodiments 1-3.

[0074] The present invention also provides a cooking appliance having the heat source power-on and power-off device described in any one of embodiments 1-3.

[0075] Specifically, those skilled in the art can understand that when the heating device and cooking appliance provided in Example 4 have the heat source power-on and power-off device described in any of Examples 1-3, the solutions to the corresponding technical problems and the achievement of their technical effects can all be found in the description of the heat source power-on and power-off device in Examples 1-3, and no further details will be given here.

[0076] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A method for cutting off power supply of a heat source, characterized in that: The steps include: S1: Determine whether the heating chamber temperature T rises to the first set temperature T1; S2: If yes, turn off all first heating relays (41), wherein each group of indoor heat sources of the heating device (2) corresponds to at least one group of the first heating relays (41) in series; if no, return to step S1; S3: Determine whether the heating chamber temperature T rises to a second set temperature T2, where T2>T1; S4: If yes, turn off the second heating relay (42) that controls the heating device (2) in series; if no, return to step S3; S5: Turn on the third steam relay (43) for controlling the steam heater (31) to be powered on and heated, so that the thermostat (32) operates to cut off the power supply of the electrical appliances, or only cuts off the power supply of the heat sources of all indoor heat sources.

2. A heat source power-off device, characterized in that: Used to cut off the indoor heat source, the indoor heat source is distributed in multiple groups in parallel, and the heat source power-on and power-off method as claimed in claim 1 is used.

3. A heat source power-on cut-off device according to claim 2, characterized in that: The indoor heat source is an upper heating pipe (21) and a lower heating pipe (22) distributed in parallel.

4. A heat source power-on cut-off device according to claim 3, characterized in that: The heat source power-on and power-off device comprises: The indoor heat source control circuit is switched on and off by a second heating relay (42), one end of the second heating relay (42) is connected in series with the indoor heat source, and the other end is connected in series with the thermostat (32), wherein the upper heating tube (21) and the lower heating tube (22) are also connected in series with at least one corresponding set of first heating relays (41); The heat source energized cut-off circuit comprises a steam heater (31), a third steam relay (43), and the thermostat (32) connected in series.

5. The heat source power-on cut-off device according to claim 3, characterized in that: The heat source power-on and power-off device comprises: The indoor heat source control circuit is switched on and off by a second heating relay (42), one end of the second heating relay (42) is connected in series with the indoor heat source, and the other end is connected in series with the thermostat (32), wherein the front end of the upper heating tube (21) is connected in series with the first group of first heating relays (411), and the front end of the lower heating tube (22) is connected in series with the second group of first heating relays (412); The heat source power-on and power-off circuit includes the thermostat (32), and further includes a steam heater (31) and a first group of third steam relays (431) which are sequentially arranged in series at the rear end of the first group of first heating relays (411) and the front end of the upper heating tube (21). The first group of first heating relays (411) and the first group of third steam relays (431) together constitute a third steam relay (43).

6. A heat source power-on cut-off device according to claim 5, characterized in that: The heat source power-on cut-off device further comprises: The inverter circuit is arranged in parallel with the main control circuit, wherein the main control circuit includes the indoor heat source control circuit and the heat source power-on and power-off circuit.

7. A heat source power-on cut-off device according to any one of claims 4 to 6, characterized in that: The first heating relay (41), the second heating relay (42), and the third steam relay (43) are all connected to and arranged on a control substrate (5).

8. A heat source power-on cut-off device according to any one of claims 2 to 6, characterized in that: The heating method of the indoor heat source includes microwave heating.

9. A heating device, characterized in that: The heating device includes the heat source power-on cutoff device according to any one of claims 2 to 8.

10. A cooking appliance, characterized in that: The cooking appliance comprises the heat source power-on cut-off device according to any one of claims 2 to 8.

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