Heating structure, temperature measurement structure and temperature control method of milk warmer and milk warmer

Abstract

The invention relates to a heating structure, a temperature measurement structure and a temperature control method of a milk warmer and the milk warmer, and belongs to the technical field of maternal and infant electric appliances. By arranging a heating structure, a temperature measuring structure and a temperature control method, the feeding bottle is clamped by utilizing the self weight of the feeding bottle, heat of a heating film is conducted to the side wall of the feeding bottle, and the heating efficiency and the use comfort of a user are improved; the first temperature sensor and the second temperature sensor are used for accurate measurement; according to the method, the heating process is divided into a plurality of heating sections, when milk is far lower than a heating target, the temperature of the milk is rapidly increased in a high-power heating mode, and when the milk is close to the heating target, the temperature of the milk is slowly increased in a low-power heating mode, so that residual temperature interference of a heating film and a temperature conduction piece can be reduced in the later heating period, and the heating efficiency is improved. And the accuracy of the actual temperature of milk is improved. Meanwhile, by means of the temperature control method, the temperature of the surface of the heating film is always higher than the liquid temperature and is within a certain controllable range, the milk quality can be better protected, and nutritional ingredients of the milk are not prone to being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of household maternal and infant products, and in particular to a heating structure, a temperature measuring structure, a temperature control method and a milk warmer. Background Art

[0002] Milk warmers are primarily used to keep milk, juice, and other foods warm and heated to a suitable drinking temperature for babies. Currently, existing milk warmers offer a variety of heating methods, including tray heating, water bath heating, steam heating, and warm air heating. While tray heating offers faster heating, it can lead to uneven heating of the milk. Furthermore, contact with the heating plate requires immediate cleaning, impacting the infant's feeding experience. While water bath heating ensures uniform heating of the milk, it is slower and lacks the required speed. Water stains on the bottle must be wiped clean after the water bath, making it inconvenient and potentially harmful to the baby's health. Steam heating, while more efficient through high-temperature steam convection, can still lead to localized overheating or incomplete heating, as well as the inconvenience of needing to clean water stains from the bottle afterward. While warm air heating is convenient, it can be noisy and impact user comfort.

[0003] How to improve the heating efficiency of milk warmers and improve the comfort of use has become an urgent problem to be solved in the industry.

[0004] In addition, existing milk warmers often suffer from inaccurate temperature control, especially for those that do not use a water bath. This problem is particularly prominent, as the temperature can easily be too high or too low, damaging the nutritional value of the milk. A search revealed that existing approaches to improving the temperature detection accuracy of milk warmers primarily rely on improving the accuracy of temperature sensors. However, this approach is limited by cost and operating environment, resulting in poor overall effectiveness. Summary of the Invention

[0005] In order to solve the problems of low heating efficiency and inaccurate temperature control in the prior art milk warmers, the present invention provides a heating structure, a temperature measuring structure, a temperature control method and a milk warmer to improve the milk warming efficiency and temperature control accuracy.

[0006] The present invention adopts the following technical solutions: A heating structure of a milk warmer comprises a base body with a space for accommodating a milk bottle, a clamping structure being provided in the accommodating space of the base body, the clamping structure comprising at least two oppositely arranged L-shaped clamping arms, the clamping arms having a vertical arm and a connected horizontal arm, a heating film being provided on the inner side of the vertical arm; each clamping arm is hinged to a fixed hinge part, and the clamping arm can swing relative to the hinge point; when the horizontal arm on the lower side of the clamping arm is subjected to a downward force generated by the deadweight of the milk bottle, the vertical arm on the upper side of the clamping arm tilts inward to press the heating film against the milk bottle, and the heating film transfers heat to the liquid in the milk bottle through heat conduction.

[0007] Furthermore, the vertical arm has an elastic fitting structure. When the vertical arm is pressed against the feeding bottle, the elastic fitting structure undergoes elastic deformation, thereby improving the fit between the heating film and the feeding bottle.

[0008] Furthermore, the elastic fitting structure is an elastic body that constitutes part or all of the material of the vertical arm, and the deformation direction of the elastic body is toward the fitting point between the heating film and the feeding bottle.

[0009] Furthermore, the elastic fitting structure is a spring, the vertical arm includes an upper vertical arm and a lower vertical arm, the heating film is located on the upper vertical arm, and the two ends of the spring respectively connect the upper and lower vertical arms into one.

[0010] The present invention also provides a temperature measurement structure of a milk warmer, including the above-mentioned heating structure of a milk warmer, and also including a first temperature sensor located on the vertical arm and capable of detecting the side of the milk bottle. A second temperature sensor capable of detecting the temperature of the bottom of the milk bottle is also provided at the bottom of the seat accommodating space. The first and second temperature sensors are electrically connected to the control module.

[0011] Furthermore, the first temperature sensor is connected to the vertical arm through a first elastic pressing portion, so that the detection end of the first temperature sensor is elastically pressed against the side wall of the bottle; the second temperature sensor is connected to the base through a second elastic pressing portion, so that the detection end of the second temperature sensor is elastically pressed against the bottom of the bottle.

[0012] Furthermore, the heating film is also provided with a third temperature sensor for detecting the temperature of the heating surface of the heating film, and the third temperature sensor is electrically connected to the control module.

[0013] The present invention also provides a temperature control method for a milk warmer, using the temperature measurement structure of the milk warmer described above, wherein the control module control program has a set of preset temperature intervals arranged in sequence from low temperature to high temperature and having a certain temperature range, and a set of milk warming temperature values ​​T for user selection, wherein the set of milk warming temperature values ​​T is within the preset temperature intervals; The control module control program also presets multiple sets of heating parameters T0, and the multiple sets of heating parameters T0 correspond one to one with multiple feeding bottle model parameters preset in the control module; Among them, the value of the heating parameter T0 corresponds to the power of the heating film: the greater the difference between the warm milk temperature value T and the preset temperature interval, the greater the value of the heating parameter T0, and the greater the value by which the corresponding temperature value detected by the first temperature sensor is higher than the warm milk temperature value T; conversely, the smaller the difference between the warm milk temperature value T and the preset temperature interval, the smaller the value of the heating parameter T0, and the smaller the value by which the corresponding temperature value detected by the first temperature sensor is higher than the warm milk temperature value T; The method includes: S1. Turn on the milk warmer and the user selects a specific milk warming temperature from the set of milk warming temperature values ​​T; S2. When the second temperature sensor detects that the temperature of the milk in the bottle is lower than the user-set temperature value, the heating film heats at a preset power and obtains the actual temperature rising parameters of the bottle within a predetermined time; S3, the control module compares the actual heating parameter with the heating parameter threshold of the pre-stored feeding bottle model, compares and selects the corresponding feeding bottle model; S4. The control module selects a corresponding preset temperature interval according to the temperature parameter detected by the second temperature sensor, selects a corresponding heating parameter T0 according to the corresponding feeding bottle model, and adjusts the heating film to a corresponding power for heating according to the heating parameter T0; S5. Repeat step S4 until the second temperature sensor detects that the temperature of the milk in the bottle is equal to the temperature set by the user, the heating film stops working, and the milk warming is completed.

[0014] Furthermore, when the milk warming temperature value T is within the preset temperature range corresponding to the milk, the heating parameter T0 is minimum, and the corresponding temperature value detected by the first temperature sensor is equal to or slightly lower than the milk warming temperature value T.

[0015] The present invention also provides a milk warmer, comprising the heating structure of the milk warmer, the temperature measuring structure of the milk warmer, and the temperature control method of the milk warmer.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By setting up a clamping structure, the weight of the bottle is converted into a clamping force caused by the vertical arm tilting inward, so that the heating film is pressed tightly against the bottle to achieve the purpose of warming milk; since milk bottles are generally vertically long columnar structures with a small bottom area, the side heating method of the multiple heating films of this device has a larger and more uniform heating surface area than the bottom heating method, thereby improving heating efficiency; the heating method of the heating film also eliminates water stains, has low working noise, and improves user comfort.

[0017] By setting the first and second temperature sensors, the temperature of the milk and the heating temperature of the side wall of the feeding bottle are detected in real time by utilizing the temperature difference between the two temperature sensors, thereby improving the accuracy of temperature measurement and temperature control.

[0018] The temperature control method used by the system divides the heating process into multiple heating stages. When the milk temperature is far below the heating target, high-power heating is used to quickly raise the milk temperature. When the milk temperature is close to the heating target, low-power heating is used to slowly raise the temperature. This reduces residual heat interference from the heating film and temperature conductors in the later stages of heating, improving the accuracy of the actual milk temperature. Furthermore, this temperature control method ensures that the surface temperature of the heating film is always higher than the liquid temperature within a certain controllable range, which can better protect the milk quality and prevent its nutrients from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the use of a milk warmer according to an embodiment of the present invention; Figure 2 is a schematic diagram of the three-dimensional structure of a milk warmer according to an embodiment of the present invention; Figure 3 yes Figure 2 Schematic diagram of the cross-section structure; Figure 4 is a structural schematic diagram of another elastic fitting structure according to an embodiment of the present invention; Figure 5 This is a schematic block diagram of a temperature measurement circuit structure of a milk warmer according to an embodiment of the present invention; Figure 6 This is a schematic block diagram of the steps of a temperature control method for a milk warmer according to an embodiment of the present invention; Figure 7 : is the milk temperature curve in the embodiment of the present invention.

[0020] Explanation of the accompanying drawings: 100, base; 101, hinged part; 102, hinge seat; 103, second elastic pressing part; 200, clamping structure; 210, clamping arm; 211, vertical arm; 211a, upper vertical arm; 211b, lower vertical arm; 212, horizontal arm; 213, fitting part; 214, supporting part; 215, hinge point; 220, elastic fitting structure; 221, elastomer; 222, spring; 230, first elastic pressing part; 300, heating film; 401, first temperature sensor; 402, second temperature sensor; 403, third temperature sensor; 500, control module; 900, feeding bottle. DETAILED DESCRIPTION

[0021] To make the present invention more clear, the heating structure, temperature measuring structure and milk warmer of the present invention are further described below with reference to the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] like Figures 1 to 3The figure shows a heating structure for a milk warmer. The structure includes a cylindrical base 100 with a concave cylindrical receiving space at its center for placing a milk bottle 900 to be heated. A clamping structure 200 is disposed within the receiving space to secure and support the milk bottle. The clamping structure 200 includes at least two L-shaped clamping arms 210, which are arranged in opposition to each other to provide a clamping force. In this embodiment, in order to improve the stability of bottle clamping and fixation, three clamping arms 210 are taken as an example. The group of clamping arms 210 are evenly distributed around the central circumference of the base body 100, wherein each clamping arm 210 includes a vertical arm 211 and a connected horizontal arm 212, and the vertical arm 211 is located above the horizontal arm 212. A hinge point 215 is provided near the area where the horizontal and vertical arms are connected, and the hinge point cooperates with the hinge part 101 provided in the accommodating space of the base body 100. The hinge part 101 is in the form of a hinge seat. In the figure, the hinge seat 102 adopts a shaft + hole matching method to realize the hinged matching of the clamping arm 210 and the hinge part 101. Under the action of external force, the clamping arm 210 can rotate relative to the hinge part (subject to spatial constraints, it is actually a swinging effect).

[0023] Specifically, the top end of the vertical arm 211 has a contact portion 213, which has a specific area. A heating film 300 is disposed inside the contact portion 213. The heating film 300 can be a flexible film, such as a PI heating film made of a thin-film insulating material, which is conventionally used. The heating surface of the heating film can be attached to the side surface of a feeding bottle. The free end of the horizontal arm 212 has a support portion 214, which has a specific support surface for supporting and contacting the bottom of the feeding bottle. When a feeding bottle containing a certain amount of milk is placed in the clamping structure 200, the bottom of the feeding bottle contacts the support portion of the horizontal arm 212. Under the weight of the feeding bottle, the clamping arm 210 swings relative to the hinge point 215, and the vertical arm 211 tilts inward (toward the feeding bottle) to press the heating film 300 against the side wall of the feeding bottle. The heat generated by the heating film 300 is directly transferred through the side wall of the feeding bottle into the milk, thereby heating the milk. Here, in order to improve heating efficiency, the heating film 300 can increase its heating contact area while taking into account the cost and actual layout space, so as to cover a larger variation in the amount of milk stored in the bottle. Correspondingly, the number of pairs of clamping arms 210 can also be appropriately increased.

[0024] In actual use, when the diameter or width of the feeding bottle (for non-circular feeding bottles) is significantly different from the size of the opening formed by the set of vertical arms 211, after the mechanism is clamped, the heating film 300 will not fit the side wall of the feeding bottle well, resulting in a smaller heat conduction surface and thus affecting the milk warming efficiency. Therefore, it is necessary to provide an elastic fitting structure 220 to improve the above-mentioned fitting effect.

[0025] The elastic fitting structure 220 has a certain elastic deformation capability. When the vertical arm 211 is pressed against the feeding bottle 900 , the elastic fitting structure 220 is elastically deformed, thereby increasing the fit between the heating film 300 and the feeding bottle 900 .

[0026] As a preferred option, combined Figure 3 As shown, the elastic fitting structure 220 is an elastomer 221 that forms part or all of the material of the vertical arm 211. The deformation direction of the elastomer 221 is toward the contact point between the heating film 300 and the feeding bottle. It can be a conventional elastic polymer material such as high-temperature resistant rubber or silicone. It can be the material that forms the fitting portion along the length of the vertical arm 211 or the material of the area located below the fitting portion. For example, the fitting portion 213 is entirely made of an elastomer. Alternatively, as shown in the figure, the elastomer 221 is located below the fitting portion 213 and serves as part of the vertical arm 211. The outer shape has multiple wavy protrusions to enhance elastic deformation capability. This structure better fits the heating film 300 to the side wall of the feeding bottle by deforming the elastomer 221 itself. Of course, considering processability, the vertical arm 211 can also be composed entirely of an elastomer, and its outer contour is preferably easy to elastically deform while having a certain degree of rigidity.

[0027] As another preferred embodiment, the elastic fitting structure 220 may also be as follows Figure 4 As shown in the structure, the elastic fitting structure 220 is a spring 222, such as a helical cylindrical spring. The vertical arm 211 includes an upper vertical arm 211a and a lower vertical arm 211b. The fitting portion is located at the end of the upper vertical arm 211a. The two ends of the spring 222 respectively connect the upper and lower vertical arms into one body in a fixed manner. In this way, the upper vertical body can change its relative position relative to the lower vertical arm under the action of the spring 222 to improve the fitting effect between the heating film 300 and the bottle.

[0028] Of course, the elastic fitting structure 220 with elastic deformation capability is not limited to an elastomer or a spring, but may also be some other elastic deformation structures or materials, so as to achieve stable fitting between the heating film 300 and the surface of the milk bottle 900.

[0029] This embodiment also provides a temperature measurement structure for a milk warmer, which is formed by adding other technical features based on the above heating structure. Figure 3 、 Figure 5As shown, the temperature measurement structure also includes a first temperature sensor 401 located on the vertical arm 211 and capable of detecting the side of the feeding bottle. The first temperature sensor 401 can detect the temperature of the milk in the heating area. The number of the first temperature sensors 401 corresponds to the number of the heating films 300. The first temperature sensors 401 are disposed on the fitting portion 213, and the heating films 300 can be made to move out of position by providing avoidance notches, holes, etc. To further improve the detection accuracy of the first temperature sensor 401 and to ensure that the first temperature sensor 401 is in close contact with the side wall of the feeding bottle to reduce external environmental interference, the first temperature sensor 401 can be connected to the fitting portion via a first elastic pressing portion 230. For example, the first elastic pressing portion 230 can be a spring or a polymer elastomer with vertical elasticity. The first elastic pressing portion 230 elastically presses the first temperature sensor 401 connected to its telescopic end against the side wall of the feeding bottle through the elastic change of its telescopic end.

[0030] A second temperature sensor 402 capable of detecting the temperature of the bottom of a feeding bottle is also provided at the bottom of the housing space of the base 100. The second temperature sensor 402 detects the temperature of the milk in the feeding bottle by measuring the temperature of the bottom of the feeding bottle. Multiple second temperature sensors 402 may be provided, and the arithmetic mean of the temperature measurement data can be used to more accurately measure the actual temperature of the milk in the feeding bottle. Furthermore, the second temperature sensor 402 can be connected to the base 100 via a second elastic pressing portion 103 to improve the fit between the second temperature sensor 402 and the bottom of the feeding bottle, thereby increasing temperature detection accuracy. Of course, the first and second elastic pressing portions are not limited to springs or polymer elastomers with vertical elasticity, but may also be other forms of elastic deformation mechanisms.

[0031] In addition, a third temperature sensor 403 is provided in each heating film 300 for measuring the temperature of the heating surface of the corresponding heating film 300. There is already a structure on the market that integrates the temperature sensor with the PI heating film, which will not be elaborated here. The first, second, and third temperature sensors and the heating film 300 are all electrically connected to the control module 500 through wires. The control module 500 stores a control program with an operating algorithm through its storage medium. The control program is controlled by its internal algorithm to obtain a more accurate temperature of the milk in the bottle. Among them, the third temperature sensor is mainly used to compensate and calibrate the actual heating temperature of the PI heating film, further improve the accuracy of the temperature of the heating source itself, and provide a basis for subsequent milk temperature control.

[0032] This embodiment also provides a temperature control method for a milk warmer, which is based on the above-mentioned temperature measurement structure to improve the accuracy of milk temperature control.

[0033] The first temperature sensor 401 detects the temperature of the surface in contact with the side wall of the feeding bottle; the second temperature sensor 402 detects the temperature of the milk in the bottom of the feeding bottle.

[0034] The control module control program presets a set of preset temperature intervals arranged in sequence from low temperature to high temperature and having a certain temperature range, and a set of warm milk temperature values ​​T for user selection, and the set of warm milk temperature values ​​T is within the above-mentioned preset temperature intervals.

[0035] The control module control program also presets multiple sets of heating parameters T0, which correspond one-to-one to multiple feeding bottle model parameters preset in the control module. The value of the heating parameter T0 varies in a direction with the power of the heating film. Specifically, the greater the difference between the milk warming temperature value T and the preset temperature range, the greater the value of the heating parameter T0, and the greater the value by which the corresponding temperature value detected by the first temperature sensor 401 is higher than the milk warming temperature value T. Conversely, the smaller the difference between the milk warming temperature value T and the preset temperature range, the smaller the value of the heating parameter T0, and the smaller the value by which the corresponding temperature value detected by the first temperature sensor 401 is higher than the milk warming temperature value T. When the milk warming temperature value T is within the preset temperature range corresponding to the milk, the heating parameter T0 is minimum, and the corresponding temperature value detected by the first temperature sensor 401 is equal to or slightly lower than the milk warming temperature value T.

[0036] Combine Figure 6 As shown, the method includes: S1. Turn on the milk warmer and the user selects a specific milk warming temperature from the set of milk warming temperature values ​​T; S2. When the second temperature sensor 402 detects that the temperature of the milk in the bottle is lower than the milk warming temperature value set by the user, the heating film 300 heats the bottle at a preset power and obtains the actual heating parameters of the bottle within a predetermined time. The actual heating parameters include the heating time and the temperature difference within the set time. S3, the control module 500 compares the actual heating parameter with the heating parameter threshold of the pre-stored feeding bottle model, compares and selects the corresponding feeding bottle model; S4. The control module 500 selects a preset temperature interval of the corresponding group according to the temperature parameter detected by the second temperature sensor 402, selects a corresponding heating parameter T0 according to the corresponding feeding bottle model, and adjusts the heating film 300 to a corresponding power for heating according to the heating parameter T0; S5. Repeat step S4 until the second temperature sensor 402 detects that the temperature of the milk in the bottle is equal to the temperature set by the user, and the heating film 300 stops working, and the milk warming process ends.

[0037] For example: The control module is pre-set with a set of preset temperature intervals and a milk warming temperature value T for user selection. The set of preset temperature intervals are a first temperature interval (0°C-20°C, excluding 0°C), a second temperature interval (20°C-35°C, excluding 20°C), a third temperature interval (35°C-37°C, excluding 35°C), a fourth temperature interval (37°C-38°C, excluding 37°C), a fifth temperature interval (38°C-39°C, excluding 38°C), a sixth temperature interval (39°C-40°C, excluding 39°C), a seventh temperature interval (40°C-41°C, excluding 40°C), an eighth temperature interval (41°C-42°C, excluding 41°C), a ninth temperature interval (42°C-43°C, excluding 42°C), a tenth temperature interval (43°C-44°C, excluding 43°C), and an eleventh temperature interval (44°C-45°C, excluding 44°C).

[0038] The set of milk warming temperature values ​​T is an integer value between 37° C. and 45° C., including both end points.

[0039] The control module 500 also presets a plurality of feeding bottle model parameters and a plurality of corresponding groups of heating parameters T0.

[0040] The parameters of the feeding bottle model include the feeding bottle material, feeding bottle wall thickness, milk volume, and temperature reading interval. These parameters are obtained through experiments and are shown in the following table (Table 1):

[0041] In the table: ΔT represents the temperature difference of the milk in the feeding bottle detected by the second temperature sensor 402, Δt represents the interval time, and t represents the temperature reading time.

[0042] The multiple sets of heating parameters T0 preset in the control module 500 correspond one-to-one with the multiple preset feeding bottle model parameters. In this embodiment, using feeding bottle model A1 as an example, the heating parameter T0 satisfies the relationship shown in the following table (Table 2), which is the difference between the above-mentioned milk warming temperature value T and the maximum value of the preset temperature range.

[0043]

[0044] In the table, α1 to α10 and β each represent a multiplication coefficient, with α1 to α10 decreasing in value, and β being the smallest. Their specific values ​​can be set to ensure that the final heating parameter T0 is positively correlated with the power of the heating film. The larger the value, the higher the corresponding temperature value detected by the first temperature sensor 401 (the temperature at the contact point of the heating film) is above the milk warming temperature T, and vice versa. The β multiplication coefficient corresponds to the smallest heating parameter T0, and the corresponding temperature value detected by the first temperature sensor 401 is equal to or slightly lower than the milk warming temperature T.

[0045] In one embodiment, the temperature control method of the milk warmer is as follows: First, place a 2mm thick bottle made of PP plastic with 120ml of milk into the accommodating cavity of the milk warmer base 100, fix the bottle with the clamping structure 200, turn on the milk warmer, and set the milk warming temperature to 38°C and the ambient temperature (milk temperature) to 22°C.

[0046] Secondly, the second temperature sensor 402 detects that the temperature of the milk in the bottle is 22°C, which is lower than the user-set temperature value of 38°C, and collects the temperature value parameters of the milk, starts the heating film 300, and the heating film 300 heats at a predetermined constant power within a predetermined time (25 seconds). The first temperature sensor 401 detects the temperature of the milk at intervals of 2 seconds to obtain the actual temperature rise parameters of the milk in the bottle.

[0047] By comparing the actual heating parameters with the pre-stored heating rate thresholds for different feeding bottle models (Table 1), it is determined that it is feeding bottle model A1 with a capacity of 120 ml, a material of PP / PPSU, and a wall thickness of 2 mm.

[0048] Next, the control module 500 selects the corresponding second preset temperature interval according to the temperature parameter detected by the second temperature sensor 402 (the first preset temperature interval is directly skipped because the ambient temperature is higher than 20°C), and selects the corresponding heating parameter T0 (Table 2) according to the corresponding bottle model A1. The heating film 300 is adjusted to the corresponding power for heating through the heating parameter T0. Here, the temperature at the contact point of the heating film is 50°C in the second preset temperature interval.

[0049] As the heating film 300 works, the second temperature sensor 402 detects a temperature increase. The control module selects the corresponding third preset temperature range and the corresponding heating parameter T0 based on the feedback information of the second temperature sensor 402, and adjusts the heating film 300 to the corresponding power for heating. Here, the temperature at the contact point of the heating film is 45°C.

[0050] Next, the control module selects the corresponding fourth preset temperature range and heating parameter T0 based on the feedback from the second temperature sensor 402, and adjusts the heating film 300 to the corresponding power for heating. Here, the temperature at the contact point of the heating film is 38°C. Of course, to further reduce the impact of residual heat, the internal program can be modified to adjust the temperature at the contact point of the heating film slightly lower than the set milk warming temperature, generally not exceeding 0.5°C. In this example, the temperature can also be set to 37.8°C.

[0051] Finally, when the second temperature sensor 402 detects that the temperature of the milk in the bottle is 38° C., which is equal to the temperature set by the user, the heating film 300 stops working, the milk warming is completed, the milk warmer prompts that the milk warming is completed, and the user takes out the bottle.

[0052] During this process, the actual temperature curve of the milk in the bottle Figure 7 As shown by Figure 7 As can be seen in the figure, at the beginning, the heating film 300 is heated at a predetermined preset power and the actual temperature rise parameters of the milk bottle are obtained within a predetermined time for judging the milk bottle model parameters; then, in the second preset temperature interval, the heating film 300 is heated at the maximum power, and the milk temperature rise rate is the fastest; then, in the third preset temperature interval, the heating film 300 is heated at a larger power, and the milk temperature rise rate is slower than that in the first preset temperature interval; finally, in the fourth preset temperature interval, the heating film 300 is heated at a smaller power, and the milk temperature rise rate is slower than that in the second preset temperature interval.

[0053] The above temperature control method has the following advantages: 1. Divide the heating process into multiple heating sections. When the milk temperature is far below the heating target, use high-power heating to quickly increase the milk temperature. When the milk temperature is close to the heating target, use low-power heating to slowly increase the milk temperature. This can reduce the residual temperature interference of the heating film and temperature conduction components in the later stage of heating, and improve the accuracy of the actual temperature of the milk.

[0054] 2. This temperature control method ensures that the surface temperature of the heating film is always higher than the liquid temperature within a certain controllable range, which can better protect the milk quality and is not easy to destroy its nutrients.

[0055] The above embodiments of the present invention are merely examples for the purpose of illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all embodiments here. However, obvious variations or modifications arising from the essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A heating structure for a milk warmer, comprising a base (100) having a space for accommodating a milk bottle (900), characterized in that: A clamping structure (200) is provided in the accommodating space of the base (100), and the clamping structure (200) includes at least two L-shaped clamping arms (210) arranged opposite to each other, the clamping arms (210) having vertical arms (211) and connected horizontal arms (212), and a heating film (300) is provided on the inner side of the vertical arms (211); each clamping arm (210) is hinged to a fixed hinge portion (101), and the clamping arm (210) can swing relative to the hinge point (215); when the horizontal arm (212) on the lower side of the clamping arm (210) is subjected to a downward force generated by the weight of the milk bottle (900), the vertical arm (211) on the upper side of the clamping arm (210) tilts inward to fit and press the heating film (300) onto the milk bottle (900), and the heating film (300) transfers heat to the liquid in the milk bottle through heat conduction.

2. The heating structure of a milk warmer according to claim 1, characterized in that: The vertical arm (211) has an elastic fitting structure (220). When the vertical arm (211) is pressed against the milk bottle (900), the elastic fitting structure (220) undergoes elastic deformation, thereby improving the fitting degree between the heating film (300) and the milk bottle (900).

3. The heating structure of a milk warmer according to claim 2, characterized in that: The elastic fitting structure (220) is an elastic body (221) that constitutes part or all of the material of the vertical arm (211), and the deformation direction of the elastic body (221) is toward the fitting position between the heating film (300) and the feeding bottle (900).

4. The heating structure of a milk warmer according to claim 2, characterized in that: The elastic fitting structure (220) is a spring (222), the vertical arm (211) comprises an upper vertical arm (211a) and a lower vertical arm (211b), the heating film (300) is located on the upper vertical arm (211a), and the two ends of the spring (222) respectively connect the upper and lower vertical arms into one body.

5. A temperature measurement structure of a milk warmer, comprising the heating structure of a milk warmer according to claim 2, characterized in that: It also includes a first temperature sensor (401) located on the vertical arm (211) and capable of detecting the side of the milk bottle. A second temperature sensor (402) capable of detecting the temperature of the bottom of the milk bottle is also provided at the bottom of the accommodating space of the base (100). The first and second temperature sensors are electrically connected to the control module (500).

6. The temperature measurement structure of a milk warmer according to claim 5, characterized in that: The first temperature sensor (401) is connected to the vertical arm (211) via a first elastic pressing portion (230), so that the detection end of the first temperature sensor (401) is elastically pressed against the side wall of the milk bottle; the second temperature sensor (402) is connected to the base (100) via a second elastic pressing portion (103), so that the detection end of the second temperature sensor (402) is elastically pressed against the bottom of the milk bottle.

7. The temperature measurement structure of a milk warmer according to claim 6, characterized in that: The heating film (300) is further provided with a third temperature sensor (403) for detecting the temperature of the heating surface of the heating film (300), and the third temperature sensor (403) is electrically connected to the control module (500).

8. A temperature control method for a milk warmer, using the temperature measurement structure of a milk warmer according to claim 6, characterized in that: The control module control program has a set of preset temperature intervals arranged in sequence from low temperature to high temperature and having a certain temperature range, and a set of milk warming temperature values ​​T for the user to select, and the set of milk warming temperature values ​​T are within the above-mentioned preset temperature intervals; The control module control program also presets multiple sets of heating parameters T0, and the multiple sets of heating parameters T0 correspond one to one with multiple feeding bottle model parameters preset in the control module; The value of the heating parameter T0 corresponds to the power of the heating film: the greater the difference between the milk warming temperature value T and the preset temperature interval, the greater the value of the heating parameter T0, and the greater the value by which the corresponding temperature value detected by the first temperature sensor 401 is higher than the milk warming temperature value T; conversely, the smaller the difference between the milk warming temperature value T and the preset temperature interval, the smaller the value of the heating parameter T0, and the smaller the value by which the corresponding temperature value detected by the first temperature sensor 401 is higher than the milk warming temperature value T; The method includes: S1. Turn on the milk warmer and the user selects a specific milk warming temperature from the set of milk warming temperature values ​​T; S2. When the second temperature sensor (402) detects that the temperature of the milk in the milk bottle is lower than the temperature value set by the user, the heating film (300) heats the milk bottle at a preset power and obtains the actual temperature increase parameter of the milk bottle within a predetermined time; S3, the control module compares the actual heating parameter with the heating parameter threshold of the pre-stored feeding bottle model, compares and selects the corresponding feeding bottle model; S4, the control module selects a corresponding preset temperature interval according to the temperature parameter detected by the second temperature sensor (402), selects a corresponding heating parameter T0 according to the corresponding milk bottle model, and adjusts the heating film (300) to a corresponding power for heating according to the heating parameter T0; S5. Repeat step S4 until the second temperature sensor (402) detects that the temperature of the milk in the bottle is equal to the temperature value set by the user, and the heating film (300) stops working, and the milk warming is completed.

9. The temperature control method of a milk warmer according to claim 8, characterized in that: When the milk warming temperature value T is within the preset temperature range corresponding to the milk, the heating parameter T0 is minimum, and the corresponding temperature value detected by the first temperature sensor 401 is equal to or slightly lower than the milk warming temperature value T.

10. A milk warmer, characterized by: The invention comprises a heating structure of a milk warmer according to any one of claims 1 to 4, a temperature measuring structure of a milk warmer according to any one of claims 5 to 7, and a temperature control method of a milk warmer according to any one of claims 8 to 9.

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