An electric heating module

Abstract

This utility model discloses an electric heating module, comprising: a stainless steel heating container with an inlet and an outlet; an electric heating tube disposed inside the stainless steel heating container, wherein the outer wall of the electric heating tube and the inner wall of the stainless steel heating container form a heating cavity; wherein an upper shell and a lower shell are welded to form the stainless steel heating container; the electric heating tube is made of stainless steel, and the upper shell has a square cross-section. Existing aluminum heating tubes suffer from high manufacturing costs and low heating efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of electric heating technology, and more specifically, it relates to an electric heating module. Background Technology

[0002] As living standards improve, more and more people are using coffee machines to brew coffee. Most existing coffee machines come with a water heater, especially drip coffee machines, where the water heater is an essential component.

[0003] However, existing electric heating elements are typically aluminum, which is costly to manufacture. Furthermore, they are usually attached to the outer wall of the heating container or spirally wrapped around its periphery to heat the liquid inside, resulting in low heating efficiency. Utility Model Content

[0004] To address the problems of high manufacturing cost and low heating efficiency of existing heating tubes, the purpose of this utility model is to provide an electric heating module, which includes: a stainless steel heating container with an inlet and an outlet; an electric heating tube disposed inside the stainless steel heating container, wherein the outer wall of the electric heating tube and the inner wall of the stainless steel heating container form a heating cavity; wherein the upper shell and the lower shell are welded to form the stainless steel heating container; the electric heating tube is made of stainless steel, and the upper shell has a square cross-section.

[0005] Furthermore, the lower housing has a circular arc cross-section, and the bottom of the lower housing is a flat surface.

[0006] Furthermore, the heating element is located inside the heating chamber on the side near the lower housing.

[0007] Furthermore, the lower housing includes a bottom plate, side plates, and a connecting plate. The two side plates are connected to both sides of the bottom plate, and the connecting plate is connected to the side of the side plate away from the bottom plate. The connecting plate forms a stop structure at the connection between the upper housing and the lower housing.

[0008] Furthermore, the connecting plate is L-shaped.

[0009] Furthermore, the electric heating module also includes a temperature detection unit, which is located below the water outlet and above the cold end of the electric heating tube.

[0010] Furthermore, the stainless steel heating container has an installation opening, and the temperature detection unit extends into the heating chamber through the installation opening.

[0011] Furthermore, the stainless steel heating container has a concave structure, and the temperature detection unit is disposed within the concave structure.

[0012] Furthermore, the electric heating module also includes a self-resetting thermostat and a manual reset thermostat mounted on the upper housing; wherein the self-resetting thermostat is connected in series with the manual reset thermostat.

[0013] Furthermore, the electric heating module also includes a mounting bracket disposed within the heating cavity for supporting the middle portion of the electric heating tube.

[0014] The technical effects and advantages of this utility model are as follows: 1. Compared to existing aluminum heating tubes, using stainless steel for both the heating tube and the heating container, and placing the heating tube inside the heating container, significantly reduces the manufacturing cost of the electric heating module while minimizing heat loss from the heating tube and improving its heating efficiency for the liquid inside the container. Furthermore, since the upper and lower shells, as well as the heating tube, are all made of stainless steel, the assembly process for the stainless steel heating container and heating tube is simplified, requiring only welding, thereby further reducing the manufacturing cost of the electric heating module.

[0015] 2. Because the lower shell is a semi-circular tube with a flat bottom and the heating element is located in the lower part of the heating chamber, the heating element can still contact the stainless steel heating container even when there is very little water. This avoids the problem of water concentrating in the arc-shaped bottom area, resulting in slow heating speed and low heating efficiency. By setting the upper shell as a U-shaped square tube, a stainless steel heating container with a round bottom and an upper top can be formed. Compared with traditional circular heating containers, the stainless steel heating container has a larger capacity and can heat more water, thereby further improving heating efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an electric heating module provided by this utility model; Figure 2 yes Figure 1 Side view of the electric heating module; Figure 3 This is a cross-section of the electric heating module. Figure 1 This is to show the position of the heating element inside the heating chamber; Figure 4 for Figure 1 Top view of the electric heating module; Figure 5 This is a schematic diagram showing the connection between the bracket and the heating element; Figure 6 Cross-section of the electric heating module Figure 2 To illustrate the structure of the support; Figure 7 for Figure 1 A bottom view of the electric heating module.

[0017] In the picture: 10. Stainless steel heating container; 11. Upper shell; 12. Lower shell; 121. Base plate; 122. Side plate; 123. Connecting plate; 13. Water inlet; 14. Water outlet; 15. Heating chamber; 20. Heating tube; 31. Self-resetting thermostat; 32. Manually reset thermostat; 33. Temperature detection unit; 40. Mounting plate; 50. Bracket. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0019] See Figure 1 This is a structural schematic diagram of an electric heating module provided by this utility model. Combined with... Figures 1 to 7 The electric heating module includes: a stainless steel heating container 10, an electric heating element 20, a self-resetting thermostat 31, a manually reset thermostat 32, a temperature detection unit 33, and a mounting plate 40. Both the stainless steel heating container 10 and the electric heating element 20 have a U-shaped structure. The stainless steel heating container 10 includes an upper shell 11 and a lower shell 12. The upper shell 11 is a square tube with a U-shaped cross-section, and the lower shell 12 is a semi-circular tube with a flat bottom. The upper shell 11 and the lower shell 12 are welded together. The electric heating element 20 is made of stainless steel and has a circular cross-section. The electric heating element 20 is placed inside the stainless steel heating container 10, and a heating chamber 15 is formed between the inner wall of the stainless steel heating container 10 and the outer wall of the electric heating element 20. The electric heating element 20 heats the liquid in the heating chamber 15 to obtain hot water or steam.

[0020] In one specific embodiment, both the inlet 13 and the outlet 14 are located on the top of the upper housing 11. A self-resetting thermostat 31 and a manual-resetting thermostat 32 are also mounted on the top of the upper housing 11. A temperature detection unit 33 is located near the outlet 14 and is used to detect the water temperature. For example, the temperature detection unit 33 is an NTC thermistor. A mounting plate 40 is welded to the bottom of the lower housing 12 and has mounting holes. The electric heating module is fixed inside the heating device via the mounting plate. For example, this heating device is a drip coffee maker.

[0021] In one specific embodiment, three mounting plates 40 are welded to the bottom of the lower housing 12. The three mounting plates 40 are respectively disposed at both ends and the middle of the lower housing 12, and are used to install and fix the electric heating module at both ends and the middle.

[0022] Understandably, compared to existing aluminum heating tubes, using stainless steel for both the heating tube and the heating container, and placing the heating tube inside the heating container, can significantly reduce the manufacturing cost of the electric heating module while minimizing heat loss from the heating tube and improving its heating efficiency for the liquid inside the heating container. Furthermore, since the upper shell 11, lower shell 12, and heating tube 20 are all made of stainless steel, the assembly process for the stainless steel heating container 10 and heating tube 20 can be simplified, requiring only welding, thereby further reducing the manufacturing cost of the electric heating module.

[0023] Because the lower shell 12 is a semi-circular tube with a flat bottom, the heating element 20 can still be in contact even when there is very little water in the stainless steel heating container 10. This avoids the problem of water concentrating in the arc-shaped bottom area, resulting in slow heating speed and low heating efficiency. By setting the upper shell 11 as a U-shaped square tube, a stainless steel heating container 10 with a circular lower section and an upper upper section can be formed. Compared to traditional heating containers with a circular cross section, the stainless steel heating container 10 has a larger capacity and can heat more water, thereby further improving heating efficiency.

[0024] Furthermore, the heating element 20 is located slightly lower within the heating chamber 15, meaning the distance between the heating element 20 and the top of the upper housing 11 is greater than the distance between the heating element 20 and the bottom of the lower housing 12. Compared to placing the heating element 20 centrally within the heating chamber 15, this results in higher heating efficiency and faster heating speed.

[0025] Specifically, the lower housing 12 includes a base plate 121, side plates 122, and connecting plates 123. Two arc-shaped side plates 122 are symmetrically arranged on the base plate 121, and two L-shaped connecting plates 123 are located at the ends of the side plates 122 away from the base plate 121. During welding, the vertical plates of the two L-shaped connecting plates 123 are positioned outside the upper housing 11, forming a stop structure at the connection between the upper housing 11 and the lower housing 12 to improve the welding quality at the connection between the upper housing 11 and the lower housing 12.

[0026] Furthermore, a support 50 is also provided inside the heating chamber 15. The support 50 is located in the middle of the heating tube 20 and is used to support and fix the middle part of the heating tube 20, ensuring that the heating tube 20 will not shift during welding. For example, the support 50 consists of an arc-shaped bottom support plate and a retaining spring.

[0027] In one specific embodiment, the heating element 20 is first fixed to the lower housing 12 by the bracket 50, and then the upper housing 11 is aligned with the lower housing 12 and welded to fix it.

[0028] Furthermore, the temperature detection unit 33 is located below the water outlet 14 and above the cold end of the heating element 20. It should be noted that the heating element 20 includes a heating section and conductive ends at both ends. When the heating element 20 is energized, the conductive ends do not heat up and are considered the cold ends of the heating element 20.

[0029] In one specific embodiment, the side wall of the upper housing 11 has an installation opening, and the temperature detection unit 33 is an NTC thermistor that extends into the heating chamber 15 through the installation opening to detect the temperature at the water outlet 14. A sealing ring is provided at the installation opening to ensure the sealing performance of the heating chamber 15 and prevent water leakage or seepage at the installation opening. Since the temperature detection unit 33 is located above the cold end of the heating element 20, the temperature detection unit 33 is not affected by the temperature of the heating element 20, and the measured water temperature is more accurate.

[0030] In one specific embodiment, the side wall of the upper housing 11 has a recessed structure. This recessed structure is located below the water outlet 14 and above the cold end of the heating element 20. The temperature detection unit 33 is an NTC thermistor installed within the recessed structure. When the pressure inside the heating chamber 15 is relatively high, installing the NTC thermistor through the recessed structure on the side wall of the upper housing 11 avoids the problem of the NTC thermistor being ejected from the installation opening due to excessive steam pressure, thereby ensuring the operational stability of the electric heating module under high internal pressure conditions.

[0031] Furthermore, the self-resetting thermostat 31, connected in series with the manual-resetting thermostat 32, forms a double-layer fuse against high-temperature dry burning, resulting in higher safety performance. Compared to fuses that blow directly, the manual-resetting thermostat 32 can be used multiple times, eliminating the need to replace the fuse every time it blows, making it more convenient for users.

[0032] In one specific embodiment, the disconnection temperature of the self-resetting thermostat 31 is lower than that of the manual reset thermostat 32. When the self-resetting thermostat 31 detects that the temperature of the heating section 22 is higher than the jump temperature, the self-resetting thermostat 31 disconnects, and the stainless steel heating element 10 stops heating. When the temperature drops to the reset temperature, the self-resetting thermostat 31 automatically returns to the conducting state, and the stainless steel heating element 10 is powered on again. After the manual reset thermostat 32 disconnects, the user needs to manually turn it on to ensure electrical safety.

[0033] Furthermore, the heating wire of the stainless steel heating element 10 is either a regular heating wire or a thermistor heating wire. Compared to a regular heating wire, with a constant voltage, the power of a thermistor heating wire decreases as its resistance increases. Therefore, when the stainless steel heating element 10 heats the liquid to the set temperature, the power supply to the stainless steel heating element 10 using the thermistor heating wire will not automatically disconnect and stop heating, but will continue to be powered on to operate at low power, achieving a heat preservation effect.

[0034] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. An electric heating module, characterized in that, The electric heating module includes: Stainless steel heating container, equipped with a water inlet and a water outlet; An electric heating element is disposed inside the stainless steel heating container, and a heating cavity is formed between the outer wall of the electric heating element and the inner wall of the stainless steel heating container. The upper shell and the lower shell are welded together to form the stainless steel heating container; the heating element is made of stainless steel, and the upper shell has a square cross-section.

2. The electric heating module according to claim 1, characterized in that, The lower housing has a circular arc cross-section, and the bottom of the lower housing is a flat surface.

3. The electric heating module according to claim 2, characterized in that, The heating element is located inside the heating chamber on the side near the lower housing.

4. The electric heating module according to claim 2, characterized in that, The lower housing includes a bottom plate, side plates, and a connecting plate. The two side plates are connected to both sides of the bottom plate, and the connecting plate is connected to the side of the side plate away from the bottom plate. The connecting plate forms a stop structure at the connection between the upper housing and the lower housing.

5. The electric heating module according to claim 4, characterized in that, The connecting plate is L-shaped.

6. The electric heating module according to claim 1, characterized in that, The electric heating module further includes a temperature detection unit, which is located below the water outlet and above the cold end of the electric heating tube.

7. The electric heating module according to claim 6, characterized in that, The stainless steel heating container has an installation opening, and the temperature detection unit extends into the heating chamber through the installation opening.

8. The electric heating module according to claim 6, characterized in that, The stainless steel heating container has a concave structure, and the temperature detection unit is located inside the concave structure.

9. The electric heating module according to claim 1, characterized in that, The electric heating module further includes a self-resetting thermostat and a manual reset thermostat installed on the upper housing; wherein the self-resetting thermostat is connected in series with the manual reset thermostat.

10. The electric heating module according to claim 1, characterized in that, The electric heating module further includes a mounting bracket disposed within the heating cavity to support the middle portion of the electric heating tube.

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