The present invention relates to a barbecue grill, and more particularly to a barbecue grill that can provide a constant heating temperature at a position of a barbecue grid of the barbecue grill.
A conventional barbecue grill has a body, a heating source, and a barbecue grid. The heating source, which can be charcoal fire, fire generated by a heating device, or electric heating generated by an electric heating device, is mounted in the body. The barbecue grid is held in the body at a position above the heating source. Foods on the barbecue grid are grilled by the heating source.
However, an actual temperature at a position of the barbecue grid will be changed by heat output of the heating source, heating time, a distance between the barbecue grid and the heating source, and other environmental factors. Even if the heating source is generated by a heating device with a stable heating output, the actual temperature at the position of the barbecue grid still may change. So foods on the barbecue grid are easily underbaked or overbaked. The conventional barbecue grill cannot provide a constant heating temperature to heat foods on the barbecue grid.
To overcome the shortcomings, the present invention tends to provide a barbecue grill that can provide a constant heating temperature at a position of the barbecue grid to mitigate or obviate the aforementioned problems.
The main objective of the present invention is to provide a barbecue grill that can provide a constant heating temperature at a position of a barbecue grid of the barbecue grill.
The barbecue grill comprises a body, a barbecue grid held in the body, a heating device mounted in the body, a heating adjustment unit connected with the heating device, a thermal sensor mounted in the body and detecting an actual temperature of a position of the thermal sensor, and a control device. The control device has a constant temperature control module electrically connected to the heating adjustment unit and the thermal sensor, determining a difference value between a target temperature and the actual temperature detected by the thermal sensor, and controlling the heating adjustment to adjust heat output of the heating device according to the difference value.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The barbecue grid 20 is held in the body 10. The heating device 30 is mounted in the body 10 and located at a position below the barbecue grid 20. The heating device 30 can be a fuel heating device or an electric heating device to heat foods on the barbecue grid 20 by fire or electric heating. The heating adjustment unit 35 is connected with the heating device 30 to adjust heat output of the heating device 30.
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In the embodiment, the stepper motor 353 of the heating adjustment unit 35 is electrically connected to the constant temperature control module 55 of the control device 50. The constant temperature control module 55 controls the stepper motor 353 according to the difference value to adjust the fuel flow output from the valve 351. When the difference value is larger than or equal to the first threshold, the constant temperature control module 55 transmits a heating control signal to the stepper motor 353 to drive the stepper motor 353 to increase the fuel flow output from the valve 351. When the difference value is less than the first threshold and larger than or equal to 0, the constant temperature control module 55 will not transmit a heating control signal to the stepper motor 353. The stepper motor 353 will not take any action. When the difference value is less than 0, the constant temperature control module 55 will transmit a heating control signal to the stepper motor 353 to drive the stepper motor 353 to decrease the fuel flow output from the valve 351. After each preset time interval, the constant temperature control module 55 will re-determine the difference value between the target temperature and the actual temperature and control the stepper motor 353 to adjust the fuel flow output from the valve 351 according to the difference value. Accordingly, the heat output of the heating device 30 is adjusted to keep the temperature at the position of the barbecue grid 20 at the target temperature.
With reference to
The lifting device 15 can be a manually controlled lifting device or an automatic lifting device. The lifting device 15 substantially has a lifting assembly 150 and a driving member 16. The lifting assembly 150 has a first leadscrew assembly 151 and a supporting frame 155. The supporting frame 155 is vertically movably connected with the first leadscrew assembly 151. The barbecue grid 20 is held on the supporting frame 155. The driving member 16 is connected to the first leadscrew assembly 151 to drive a leadscrew of the first leadscrew assembly 151 to rotate, and the supporting frame 155 is driven to move up and down relative to the first leadscrew assembly 151. The driving member 16 may be a driving rod for a user to manually drive the lifting device 15. The driving member 16 may be a lifting driving device to drive the lifting device 15.
The lifting device 15 further has a second leadscrew assembly 156 and a linkage member 154. The second leadscrew assembly 156 and the first leadscrew assembly 151 are respectively connected to two opposite sides of the supporting frame 151. Two opposite ends of the linkage member 154 are respectively connected to the first leadscrew assembly 151 and the second leadscrew assembly 156. When the driving member 16 drives the leadscrew of the first leadscrew assembly 151 to rotate, the linkage member 154 is simultaneously driven to rotate and drives a leadscrew of the second leadscrew assembly 156 to rotate. The supporting frame 155 can be stably moved up and down by the simultaneous action of the first leadscrew assembly 151 and the second leadscrew assembly 156.
In the embodiment, the driving member 16 is a lifting driving device and has a lifting driving motor 161 connected to the lifting assembly 150 and electrically connected to the control device 50. The control device 50 controls the lifting driving motor 161 to drive the lifting assembly 150 to vertically move the barbecue grid 20 relative to the heating device 30. The control device 50 has a lifting control module 56. The lifting control module 56 is electrically connected to the lifting driving motor 161 to control an act of the lifting driving motor 161.
Preferably, the lifting driving motor 161 is electrically connected to the constant temperature control module 55. The constant temperature control module 55 controls the lifting driving motor 161 to adjust the position of the barbecue grid 20 relative to the heating device 30 according to the difference value between the target temperature and the actual temperature.
For example, when the constant temperature control module 55 determines the difference value is larger than a second threshold, wherein the second threshold is larger than the first threshold, for example, the second threshold is 30, then, the constant temperature control module 55 will firstly determine whether the supporting frame 155 of the lifting device 15 is located at a lowest position. If not, the constant temperature control module 55 controls the lifting driving motor 161 to move down the supporting frame 155 of the lifting device 15. When the constant temperature control module 55 determines the difference value is less than or equal to a third threshold, wherein the third threshold is smaller than 0, for example, minus 30 (−30), then the constant temperature control module 55 will firstly determine whether the supporting frame 155 of the lifting device 15 is located at a highest position. If not, the constant temperature control module 55 controls the lifting driving motor 161 to move up the supporting frame 155 of the lifting device 15.
With such arrangements, the constant temperature control module 55 can determine whether the actual temperature at the position of the thermal sensor 40 is too high or too low according to the difference value between a target temperature and the actual temperature detected by the thermal sensor 40, and then controls the heating adjustment unit 35 to adjust the heat output of the heating device 30, such that the temperature at the position of the barbecue grid 20 can be kept constant. Preferably, the thermal sensor 40 is fixed on the barbecue grid 20 to keep the position of the barbecue grid 20 at the target temperature. In addition, the body 10 has the lifting device 15 mounted therein. The barbecue grid 20 can be moved toward or away from the heating device 30 by the lifting device 15 to adjust the temperature at the position of the barbecue grid 20.
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Number | Date | Country | Kind |
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202120452919.X | Mar 2021 | CN | national |