Inner tube and heating device for heating liquid

Abstract

The present application relates to the technical field of liquid heating, and in particular to an inner tube and a heating device for heating liquid, wherein the inner tube comprises a hollow tube body, wherein the outer peripheral wall of the tube body is recessed toward the center of the tube body axis to form a groove, and the position of the groove corresponding to the inner peripheral wall of the tube body is raised toward the center of the tube body axis; the groove extends from the lower end of the outer peripheral wall of the tube body to the upper end of the outer peripheral wall of the tube body, and the groove adopts a tortuous bending structure; the width of the section of the groove near the water inlet end of the tube body is greater than the width of the section of the groove away from the water inlet end of the tube body. The inner tube provides a method of integrally molding the surface of the tube body to form a groove, which helps to reduce the risk of water leakage caused by gaps between the grooves; the tortuous bending structure helps to ensure that the temperature of the hot water output after heating meets the requirements; the width of the section of the groove changes from large to small, which plays a role in increasing water pressure. The present application optimizes the output of hot water through structural mutual correlation and coordination.

Description

Technical Field

[0001] The present application relates to the technical field of liquid heating, and in particular to an inner tube and a heating device for heating liquid. Background Art

[0002] A coffee machine is a machine that uses hot water to generate high temperature for the edible molecules in coffee bean powder, and uses an internal water pump to increase the high pressure to physically extract the coffee liquid. The performance of the coffee machine regarding hot water is mainly reflected by the heating device.

[0003] Conventional heating devices are mostly provided with a disc-type water pipe structure 10, such as Figure 1 As shown, the disc-type water pipe structure 10 refers to a flat disc body in which a water pipe is continuously coiled into a shape similar to a coiled spring. A constant flow of water enters the water pipe from the water inlet, flows along the water pipe, and then flows out from the water outlet of the water pipe. In the process of water flowing in the water pipe, the heating device exchanges heat with the water in the water pipe based on the principle of electric heating, thereby achieving the effect of continuously outputting hot water. However, the disc-type water pipe structure 10 has the following defects: the material used for spacing between adjacent water pipes is mostly made of silicone. Due to long-term heating, the silicone used for spacing will bulge, and the bulging will cause gaps to form between the pipes, resulting in water not flowing along the water pipe after entering the water pipe, increasing the risk of water leakage in the gap, which makes it impossible to implement heat exchange well, affects the heating effect, and even affects the water pressure due to water leakage, resulting in a reduction in the flow rate of the final output water. Therefore, the above problems need to be solved urgently. Summary of the Invention

[0004] In order to solve the problem of poor hot water output due to structural defects in the prior art, the present application provides an inner tube for heating liquid and a heating device.

[0005] In the first aspect, the present application provides an inner tube for heating liquid, comprising a hollow tube body, the outer peripheral wall of the tube body being recessed toward the axial center of the tube body to form a groove, and the position of the inner peripheral wall of the tube body corresponding to the groove protrudes toward the axial center of the tube body; the groove extends from the lower end of the outer peripheral wall of the tube body to the upper end of the outer peripheral wall of the tube body, and the groove adopts a tortuous bending structure; the section cross-sectional width of the groove close to the water inlet end of the tube body is greater than the section cross-sectional width of the groove away from the water inlet end of the tube body.

[0006] By adopting the above solution, the present application provides a method in which the surface of the tube body is integrally formed with grooves. When water flows through the grooves, the integrally formed structure prevents the grooves from bulging due to temperature increases, helping to reduce the risk of water leakage caused by gaps between the grooves. While reducing the risk of water leakage, the grooves extend from the lower end of the outer peripheral wall of the tube body to the upper end of the outer peripheral wall of the tube body, presenting a vertical layout. Combined with the grooves adopting a tortuous bending structure, the total length of the grooves is increased, allowing the time for water to flow along the grooves to be extended, thereby extending the time for heat exchange with the heating component installed on the outer tube, helping to ensure that the temperature of the hot water output after heating reaches the required level. Furthermore, based on the vertical layout of the grooves, in order to effectively ensure the flow rate of the output water flow, the cross-sectional width of the grooves near the water inlet end of the tube body is greater than the cross-sectional width of the grooves far from the water inlet end of the tube body. In this way, when a constant flow of water flows into the grooves, the cross-sectional width of the grooves changes from large to small, which acts to increase the water pressure, helping to increase the flow rate of the water output from the water outlet end of the grooves. Through the interrelated coordination of the structures, the present application achieves an optimized effect on the output of hot water.

[0007] Optionally, the circuitous bending structure is that the groove is arranged to bend back and forth in a continuous S shape from the lower end of the outer peripheral wall of the tube body to the upper end of the outer peripheral wall of the tube body.

[0008] By adopting the above solution and the above arrangement, the grooves can be fully distributed on the outer surface of the tube body, effectively utilizing the area of ​​the outer surface of the tube body.

[0009] Optionally, the tortuous bending structure is that the groove includes several annular segments located on the outer peripheral wall of the tube body, and the several annular segments are arranged in sequence from bottom to top, and adjacent annular segments are respectively connected with connecting sections, and multiple connecting sections are staggered in sequence from the lower end of the outer peripheral wall of the tube body to the upper end of the outer peripheral wall of the tube body.

[0010] By adopting the above solution, the above arrangement can ensure that the grooves are fully distributed on the outer surface of the tube body, and the water flowing in the grooves can exchange heat with the heating components arranged on the outer tube for a longer time.

[0011] In a second aspect, the present application further provides a heating device, comprising:

[0012] For example, the winding structure is an inner tube in which the groove is arranged to be reciprocally bent in a continuous S-shape from the lower end of the outer peripheral wall of the tube body to the upper end of the outer peripheral wall of the tube body;

[0013] The outer tube is cylindrical and is sleeved on the outer peripheral wall of the tube body. The two ends of the outer tube are respectively sealed with the two ends of the tube body. The outer peripheral wall of the outer tube is provided with a heating component.

[0014] The inner circumferential wall of the outer tube is in close contact with the raised portion of the outer circumferential wall of the inner tube. The inner circumferential wall of the outer tube, the outer circumferential wall of the tube body and the groove cooperate to form a flow channel. The upper end of the flow channel is connected to a water outlet pipe, and the lower end of the flow channel is connected to a water inlet pipe.

[0015] By adopting the above solution, the heating device is connected to a constant flow of water through the water inlet pipe. The water flows into the flow channel from the water inlet pipe and flows along the continuous S-shaped reciprocating curved flow channel to the water outlet pipe. During the flow of water in the flow channel, the heating component arranged on the outer pipe is used as a heat source to perform heat exchange on the water in the flow channel, thereby raising the water temperature to the specified requirements, and finally outputting hot water from the water outlet pipe.

[0016] In a third aspect, the present application further provides a heating device, comprising:

[0017] For example, the zigzag structure is that the groove includes a plurality of annular segments located on the outer peripheral wall of the tube body, the plurality of annular segments are arranged in sequence from bottom to top, adjacent annular segments are respectively connected by connecting segments, and the plurality of connecting segments are sequentially staggered from the lower end of the outer peripheral wall of the tube body to the upper end of the outer peripheral wall of the tube body;

[0018] The outer tube is cylindrical and is sleeved on the outer peripheral wall of the tube body. The two ends of the tube body are sealed with the two ends of the tube body respectively. The outer peripheral wall of the outer tube is provided with a heating component.

[0019] The inner circumferential wall of the outer tube is in close contact with the raised portion of the outer circumferential wall of the tube body. The inner circumferential wall of the outer tube, the outer circumferential wall of the inner tube and the groove cooperate to form a flow channel. The upper end of the flow channel is connected to a water outlet pipe, and the lower end of the flow channel is connected to a water inlet pipe.

[0020] By adopting the above solution, the heating device is connected to a constant flow water source through a water inlet pipe. The water flows into the water inlet pipe and flows along a flow channel with a tortuous bending structure to the water outlet pipe. During the flow of water in the flow channel, the heating component arranged on the outer pipe serves as a heat source to perform heat exchange on the water in the flow channel, thereby raising the water temperature to the specified requirements, and finally outputting hot water from the water outlet pipe.

[0021] Optionally, the heating component includes an insulating layer, a heating resistor and a terminal seat, the insulating layer is arranged on the outer peripheral wall of the outer tube, the heating resistor is printed on the insulating layer, the heating resistor is distributed in a circuitous manner on the insulating layer, and the terminal seat is installed on the outer peripheral wall of the outer tube; power pads are provided at both ends of the heating resistor, and the terminal seat is provided with power terminals for connecting to the power pads, and the number of the power terminals is the same as the number of the power pads.

[0022] By adopting the above solution, the heating resistors are distributed in a circuitous manner in the insulating layer, which increases the heating area and helps to efficiently exchange heat with the water in the flow channel; the setting of the power pad, power terminal and terminal seat facilitates the electrical connection between the heating component and the outside.

[0023] Optionally, the heating component also includes a first temperature sensor for detecting the outlet water temperature and a second temperature sensor for detecting the heating resistor, and the first temperature sensor and the second temperature sensor are both arranged in the insulating layer; the common end of the first temperature sensor and the second temperature sensor is connected to a common solder pad, the first temperature sensor is connected to a first solder pad, and the second temperature sensor is connected to a second solder pad; the power supply solder pad is opposite to and spaced from the first solder pad, the second solder pad, and the common solder pad sheet; the terminal seat is provided with a common signal terminal for connecting to the common solder pad, a first signal terminal for connecting to the first solder pad, and a second signal terminal for connecting to the second solder pad.

[0024] By adopting this solution, the first temperature sensor automatically senses and monitors the output water temperature by using changes in its resistivity corresponding to changes in temperature. The second temperature sensor automatically detects the heating resistor by using changes in its resistivity corresponding to changes in temperature, helping to prevent the heating resistor from drying out the tube. The provision of a common solder pad helps optimize circuit layout. Furthermore, by collectively installing the power terminal, common signal terminal, first signal terminal, and second signal terminal in the same terminal block, material costs can be reduced and processing can be more convenient.

[0025] Optionally, the water inlet pipe is installed on the inner circumferential wall of the tube body, and the inner circumferential wall of the tube body is provided with a water inlet opening for connecting the water inlet pipe and the flow channel; the water outlet pipe is installed on the outer circumferential wall of the outer tube, and the outer tube is provided with a water outlet opening for connecting the water outlet pipe and the flow channel.

[0026] By adopting the above solution, the water outlet pipe is located outside the tube body, so the water outlet pipe will not block the entry into the hollow space inside the tube body, which helps to fully utilize the space in the hollow position of the tube body to accommodate external circuit boards or other components.

[0027] Optionally, the water inlet pipe and the water outlet pipe are both installed on the outer peripheral wall of the outer pipe, the outer pipe is provided with a water inlet opening for communicating the water inlet pipe with the flow channel, and the outer pipe is provided with a water outlet opening for communicating the water outlet pipe with the flow channel.

[0028] By adopting the above solution, neither the water outlet pipe nor the water inlet pipe will block access to the space inside the hollow tube body, which helps to fully utilize the space in the hollow position of the tube body to accommodate external circuit boards or other components.

[0029] The water inlet pipe and the water outlet pipe are both installed on the inner circumferential wall of the tube body. The lower end of the tube body is provided with a water inlet opening for connecting the water inlet pipe and the flow channel, and the upper end of the tube body is provided with a water outlet opening for connecting the water outlet pipe and the flow channel.

[0030] By adopting the above solution, the present application arranges both the water inlet pipe and the water outlet pipe on the inner peripheral wall of the pipe body, thereby reducing the peripheral size of the entire heating pipe device assembly.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. The present invention provides an inner tube for heating liquids with grooves integrally formed on the surface of the tube body. When water flows through the grooves, the integrally formed structure prevents bulging between the grooves due to temperature increases, helping to reduce the risk of water leakage caused by gaps between the grooves. While reducing the risk of water leakage, the grooves extend from the lower end of the outer peripheral wall of the tube body to the upper end of the outer peripheral wall of the tube body, presenting a vertical layout. The grooves adopt a tortuous bending structure to increase the total length of the grooves, allowing the time for water to flow along the grooves to be extended, thereby extending the time for heat exchange with the heating element arranged on the outer peripheral wall of the outer tube, helping to ensure that the temperature of the hot water output after heating reaches the required level. Furthermore, based on the vertical layout of the grooves, in order to effectively ensure the flow rate of the output water, the cross-sectional width of the grooves near the water inlet end of the tube body is greater than the cross-sectional width of the grooves farther from the water inlet end of the tube body. This allows the grooves to have a constant flow of water. The change in the cross-sectional width of the grooves increases the water pressure, helping to increase the flow rate of water output from the water outlet end of the grooves. Through the interrelated coordination of the structures, the present invention optimizes the output of hot water.

[0033] 2. The heating device of the present application is connected to a constant flow water source through a water inlet pipe. Water enters from the water inlet pipe and flows along the flow channel to the water outlet pipe. During the flow of water in the flow channel, the heating component arranged on the outer wall of the outer tube serves as a heat source to perform heat exchange on the water in the flow channel, thereby raising the water temperature to the specified requirements, and finally outputting hot water from the water outlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a simplified structural diagram of a conventional disc water pipe structure.

[0035] Figure 2 This is a schematic structural diagram of an inner tube for heating liquid described in Example 1 of the present application.

[0036] Figure 3 This is a structural schematic diagram of a heating device described in Example 1 of the present application.

[0037] Figure 4 This is a structural schematic diagram of a heating device described in Example 1 of the present application from another angle.

[0038] Figure 5 This is a schematic internal cross-sectional view of a heating device described in Example 1 of the present application.

[0039] Figure 6 This is a schematic internal cross-sectional view of a heating device described in Example 1 of the present application, in which the water inlet pipe is installed on the inner peripheral wall of the pipe body and the water outlet pipe is installed on the outer peripheral wall of the outer pipe.

[0040] Figure 7 This is a structural schematic diagram of a heating device described in Example 1 of the present application, ignoring the terminal seat and the water outlet pipe.

[0041] Figure 8 This is a schematic diagram of the expanded structure of the heating component of a heating device described in Example 1 of the present application.

[0042] Figure 9 This is a schematic internal cross-sectional view of a heating device described in Example 2 of the present application, in which the water inlet pipe and the water outlet pipe are both installed on the outer peripheral wall of the outer tube.

[0043] Figure 10 This is a schematic internal cross-sectional view of a heating device described in Example 3 of the present application, in which the water inlet pipe and the water outlet pipe are both installed on the inner circumferential wall of the pipe body.

[0044] Figure 11 This is a schematic structural diagram of an inner tube for heating liquid described in Example 4 of the present application.

[0045] Figure 12 This is a schematic structural diagram from another angle of an inner tube for heating liquid described in Example 4 of the present application.

[0046] Figure 13 This is a schematic internal cross-sectional view of a heating device described in Example 4 of the present application.

[0047] Figure markings: 1. Inner tube; 11. Tube body; 2. Groove; 21. Horizontal groove section; 22. Vertical groove section; 23. Ring section; 24. Connecting section; 3. Outer tube; 4. Flow channel; 5. Water outlet pipe; 6. Water inlet pipe; 7. Heating component; 71. Insulation layer; 72. Heating resistor; 73. Terminal seat; 74. Power pad; 75. Power terminal; 76. First temperature sensor; 77. Second temperature sensor; 78. Common pad; 79. First pad; 710. Second pad; 711. First signal terminal; 712. Second signal terminal; 713. Common signal terminal; 714. Ground terminal; 715. Support terminal; 8. Water inlet opening; 9. Water outlet opening; 10. Disc-type water pipe structure. DETAILED DESCRIPTION

[0048] Below, in conjunction with the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that, without conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form new embodiments.

[0049] In the description of the present invention, it should be understood that terms such as "center," "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," "inner," and "outer" to indicate positions or relationships are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific manner, and are therefore not to be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0051] Example 1

[0052] Compared to Figure 1 The disc-type water pipe structure 10 shown in the present application provides an inner pipe 1 for heating liquid, referring to Figure 2 , including a hollow tube body 11, which is adapted to be installed in the heating device of the coffee machine. The hollow setting can reduce space occupation. The outer peripheral wall of the tube body 11 is recessed toward the axial center of the tube body 11 to form a groove 2, and the position of the inner peripheral wall of the tube body 11 corresponding to the groove 2 is raised toward the axial center of the tube body 11. The tube body 11 can be made of metal or alloy material, and the tube is formed into the above shape by pressing, so that the tube body 11 and the groove 2 form an integrally formed structure. In this way, when water flows in the groove 2, the risk of water leakage due to gaps between the grooves is greatly reduced.

[0053] Among them, the groove 2 extends from the lower end of the outer peripheral wall of the tube body 11 to the upper end of the outer peripheral wall of the tube body 11. The present application allows the groove 2 to present the characteristics of a vertical layout through the above structure. And the groove 2 adopts a tortuous bending structure. This setting allows the groove 2 to make full use of the outer surface of the tube body 11, increasing the total length of the groove 2, and extending the time for water to flow along the groove 2, thereby extending the time for water to exchange heat with the external heating component 7, helping to ensure that the temperature of the final output water meets the requirements. As one embodiment, the tortuous bending structure is a continuous S-shaped reciprocating bending setting of the groove 2 from the lower end of the outer peripheral wall of the tube body 11 to the upper end of the outer peripheral wall of the tube body 11. Specifically, referring to Figure 2 The grooves 2, arranged in a continuous S-shaped reciprocating curve, specifically include at least eight transverse groove segments 21 and a plurality of vertical groove segments 22 on the outer peripheral wall of the tube body 11, which connect the eight transverse groove segments 21 end to end. The eight transverse groove segments 21 are arranged from bottom to top. This arrangement allows the grooves 2 to be fully distributed on the outer surface of the tube body 11 while ensuring smooth water flow.

[0054] In this embodiment, in order to allow water to flow through the groove 2 more smoothly, refer to Figure 2 The cross-sectional width of the groove 2 near the water inlet end of the tube body 11 is greater than the cross-sectional width of the groove 2 far from the water inlet end of the tube body 11. With this arrangement, after a constant flow of water from the outside continuously enters the groove 2 from the water inlet end of the tube body 11, the water gradually flows upward from the groove 2 position with a relatively large cross-sectional width to the groove 2 position with a relatively small cross-sectional width. The water pressure increases, which helps to increase the flow rate of water output from the water outlet end of the groove 2.

[0055] As one of the implementation methods, Figure 2 As shown, the cross-sectional width of one of the eight transverse groove segments 21 close to the water inlet end of the tube body 11 , i.e., the transverse groove segment 21 located at the lowest end of the outer peripheral wall of the tube body 11 , is greater than the cross-sectional widths of the remaining seven transverse groove segments 21 and the vertical groove segment 22 .

[0056] As another embodiment, the cross-sectional width of at least one of the eight transverse groove segments 21 located at the lower end of the outer peripheral wall of the tube body 11 may be greater than the cross-sectional widths of the remaining transverse groove segments 21 and the vertical groove segments 22 .

[0057] As another embodiment, the cross-sectional width of the groove 2 arranged in a continuous S-shaped reciprocating bend may be gradually reduced from bottom to top.

[0058] This application provides a heating device based on the above-mentioned inner tube 1 for heating liquid, referring to Figure 3 and Figure 4, including: the inner tube 1 as described above; the outer tube 3, which is cylindrical, so as to help adapt to the shape of the outer wall of the inner tube 1, the outer tube 3 is sleeved on the outer wall of the tube body 11, and the two ends of the outer tube 3 are respectively sealed with the two ends of the tube body 11, and the outer wall of the outer tube 3 is provided with a heating component 7. Figure 5 The inner circumferential wall of the outer tube 3 is in close contact with the raised portion of the outer circumferential wall of the tube body 11. The inner circumferential wall of the outer tube 3 and the raised portion of the outer circumferential wall of the inner tube 1 can be connected by abutment or bonding. The contact portion of the two tubes is sealed to prevent water leakage between the channels. Figure 5 The inner circumferential wall of the outer tube 3, the outer circumferential wall of the tube body 11, and the groove 2 cooperate to form a flow channel 4. The upper end of the flow channel 4 is connected to a water outlet pipe 5, and the lower end of the flow channel 4 is connected to a water inlet pipe 6. The heating device provided in this embodiment can be used as an assembly component for other beverages such as coffee machines. A constant flow water source is connected through the water inlet pipe 6. Water enters from the water inlet pipe 6 and flows along the flow channel 4 to the water outlet pipe 5. As the water flows through the flow channel 4, the heating component 7 provided on the outer circumferential wall of the outer tube serves as a heat source for heat exchange with the water in the flow channel 4, thereby raising the water temperature to the specified requirement. Finally, the hot water is output through the water outlet pipe 5.

[0059] As one of the implementation methods, look back Figure 2 and reference Figure 6 、 Figure 7 The water inlet pipe 6 is mounted on the inner circumferential wall of the tube body 11, which is provided with an inlet opening 8 for communicating between the water inlet pipe 6 and the flow channel 4. The water outlet pipe 5 is mounted on the outer circumferential wall of the outer tube 3, which is provided with an outlet opening 9 for communicating between the water outlet pipe 5 and the flow channel 4. This arrangement allows the water outlet pipe 5 to be located outside the tube body 11, thereby preventing access to the hollow interior of the tube body 11 and facilitating full utilization of the hollow space within the tube body 11 to accommodate external circuit boards or other components. Furthermore, the water inlet pipe 6 is partially bent downward at an angle of 90°-160°, and can be bent 150° downward to facilitate connection to an external hose.

[0060] In terms of heating component 7, specifically, look back Figure 3 and reference Figure 7 、 Figure 8 The heating component 7 includes an insulating layer 71 , a heating resistor 72 and a terminal seat 73 . The insulating layer 71 is arranged on the outer peripheral wall of the outer tube 3 . Specifically, the insulating layer 71 is printed on the outer peripheral wall of the outer tube 3 .

[0061] The heating resistor 72 is printed on the insulating layer 71, and the heating resistor 72 is distributed in a circuitous manner in the insulating layer 71. Figure 8The heating resistors 72 are fully distributed in the insulating layer 71 in a circuitous manner, thereby increasing the heating area and facilitating efficient heat exchange of the water in the flow channel 4.

[0062] Furthermore, a terminal block 73 is mounted on the outer peripheral wall of the outer tube 3. Power supply pads 74 are provided at both ends of the heating resistor 72. The terminal block 73 is provided with power terminals 75 for connecting to the power supply pads 74. The number of power supply terminals 75 is the same as the number of power supply pads 74. The power supply pads 74 are electrically connected to an external power source via the power supply terminals 75, thereby energizing the heating resistor 72.

[0063] Further, refer to Figure 7 and Figure 8 The heating component 7 further includes a first temperature sensor 76 for detecting the water temperature and a second temperature sensor 77 for detecting the heating resistor 72. The first temperature sensor 76 and the second temperature sensor 77 are both arranged on the insulating layer 71. Figure 8 The first temperature sensor 76 can be located at the upper end of the outer peripheral wall of the outer tube 3 corresponding to the insulating layer 71, that is, close to the water outlet opening 9, and the second temperature sensor 77 can be located below the first temperature sensor 76, that is, close to the heating resistor 72.

[0064] With this configuration, the first temperature sensor 76 and the second temperature sensor 77 can utilize NTC (Negative Temperature Coefficient) temperature controllers. Their primary function is to change resistivity in response to changes in sensed temperature. The first temperature sensor 76 is positioned near the water outlet 9, effectively sensing the temperature of the water near the outlet pipe 5 and about to be discharged, i.e., the outlet water temperature. Specifically, as the water temperature increases, the resistance of the first temperature sensor 76 decreases accordingly. The resistance signal from the first temperature sensor 76 is transmitted to an external control unit, which then reduces the operating voltage or current of the heating resistor 72, thereby sensing and monitoring the outlet water temperature and assisting in achieving the automatic temperature control function.

[0065] The second temperature sensor 77 is located close to the heating resistor 72, which can effectively implement the heating protection function. Specifically, when the temperature sensed by the second temperature sensor 77 exceeds the preset temperature threshold, the resistance of the second temperature sensor 77 is reduced to within the corresponding resistance range. The resistance signal from the second temperature sensor 77 after the reduction is transmitted to the external control unit, which cuts off the external power supply and stops the heating resistor 72 from heating, thereby helping to prevent dry burning, achieve a protective effect, and improve safety of use. Among them, the preset temperature threshold can range from 130°C to 190°C.

[0066] For signal connection, refer to Figure 7 and Figure 8 The first temperature sensor 76 and the second temperature sensor 77 are commonly connected with a common pad 78, the first temperature sensor 76 is connected with a first pad 79, and the second temperature sensor 77 is connected with a second pad 710. The provision of the common pad 78 helps to optimize the circuit layout and reduce material costs. In addition, the power pad 74 is opposite to and spaced apart from the first pad 79, the second pad 710, and the common pad 78; the terminal block 73 is provided with a common signal terminal 713 for connecting to the common pad 78, a first signal terminal 711 for connecting to the first pad 79, and a second signal terminal 712 for connecting to the second pad 710. The power terminal 75, the common signal terminal 713, the first signal terminal 711, and the second signal terminal 712 are collectively mounted on the same terminal block 73, which helps to optimize the circuit layout, reduce material costs, and is more convenient in terms of processing.

[0067] Replay Figure 3 The terminal block 73 is also provided with a grounding terminal 714. The provision of the grounding terminal 714 helps prevent the terminal block 73 housing from being charged, thereby improving the safety of use. In addition, the terminal block 73 is also provided with a firmly mounted fixed terminal 715.

[0068] Based on the above-mentioned heating device, the present application further provides a method for manufacturing the heating device, comprising the following steps:

[0069] S1. Cutting a sheet of metal or alloy into strips of specified size.

[0070] S2. Pressing and forming the surface of the slat into a prescribed shape; wherein the prescribed shape is specifically a continuous S-shaped reciprocating bend.

[0071] S3, rolling the pressed strips to form an inner tube 1, wherein the pressed shape corresponds to the groove 2 formed on the outer peripheral wall of the inner tube 1.

[0072] S4. The cylindrical outer tube 3 is sleeved on the inner tube 1, the inner circumferential wall of the outer tube 3 abuts against the raised part of the outer circumferential wall of the inner tube 1, the two ends of the outer tube 3 are respectively sealed with the two ends of the inner tube 1, the inner circumferential wall of the outer tube 3, the outer circumferential wall of the inner tube 1 and the groove 2 cooperate to form a flow channel 4, the upper end of the flow channel 4 is connected to the water outlet pipe, and the lower end of the flow channel 4 is connected to the water inlet pipe 6.

[0073] S5. A heating component 7 is provided on the outer peripheral wall of the outer tube 3. The connection method of the heating component 7 is the same as that of the above-mentioned heating device, and will not be repeated here.

[0074] Example 2

[0075] The difference from Example 1 is that Figure 9The water inlet pipe 6 and the water outlet pipe 5 are both mounted on the outer peripheral wall of the outer tube 3. The lower end of the outer tube 3 is provided with a water inlet opening 8 for communicating the water inlet pipe 6 with the flow channel 4, and the upper end of the outer tube 3 is provided with a water outlet opening 9 for communicating the water outlet pipe 5 with the flow channel 4. This arrangement ensures that neither the water outlet pipe 5 nor the water inlet pipe 6 blocks access to the interior of the hollow tube body 11, thereby making full use of the hollow space of the tube body 11 to accommodate external circuit boards or other components.

[0076] Example 3

[0077] The difference from Example 1 and Example 2 is that Figure 10 The water inlet pipe 6 and the water outlet pipe 5 are both installed on the inner circumferential wall of the tube body 11. The lower end of the tube body 11 is provided with a water inlet opening 8 for connecting the water inlet pipe 6 with the flow channel 4, and the upper end of the tube body 11 is provided with a water outlet opening 9 for connecting the water outlet pipe 5 with the flow channel 4. This arrangement can reduce the outer dimensions of the entire heating pipe device assembly. On the other hand, the water inlet pipe 6 is partially bent downward at a bending angle of 90°-160°, wherein the water inlet pipe 6 can be partially bent downward at 150°, which is convenient for connecting to an external hose. The water outlet pipe 5 is partially bent upward at a bending angle of 90°-160°, wherein the water outlet pipe 5 can be partially bent upward at 150°, which is convenient for connecting to an external hose.

[0078] Example 4

[0079] The present application also provides another inner tube 1 for heating liquid. Different from embodiments 1, 2, and 3, the tortuous bending structure is that the groove 2 includes several annular segments 23 located on the outer peripheral wall of the tube body 11. The several annular segments 23 are arranged in sequence from bottom to top, and adjacent annular segments 23 are respectively connected to connecting segments 24, and multiple connecting segments 24 are staggered in sequence from the lower end of the outer peripheral wall of the tube body 11 to the upper end of the outer peripheral wall of the tube body 11.

[0080] Reference Figure 11 and Figure 12 This arrangement allows the grooves 2 to be fully distributed across the outer surface of the tube body 11 while also ensuring smooth water flow. Specifically, there are eight annular segments 23. The annular segment 23 closest to the water inlet of the tube body 11, i.e., at the lowest end of the outer circumferential wall of the tube body 11, has a greater cross-sectional width than the remaining seven annular segments 23 and the connecting segment 24.

[0081] As another embodiment, the cross-sectional width of at least one of the eight annular segments 23 located at the lower end of the outer peripheral wall of the tube body 11 is greater than the cross-sectional widths of the remaining annular segments 23 and the connecting segment 24 .

[0082] As another embodiment, the cross-sectional widths of the annular segment 23 and the connecting segment 24 gradually decrease from bottom to top.

[0083] With this arrangement, after the constant flow of water from the outside world continuously enters the groove 2 from the water inlet end of the pipe body 11, the water gradually flows upward from the groove 2 with a relatively large section width through the groove 2 with a relatively small section width, and its water pressure will increase, which helps to increase the flow rate of water output from the water outlet end of the groove 2.

[0084] Based on the inner tube 1 for heating liquid, the present application further provides a heating device, comprising: the inner tube 1 as described above; an outer tube 3, which is cylindrical and is sleeved on the outside of the inner tube 1, with both ends of the outer tube 3 sealed to the two ends of the inner tube 1, and a heating component 7 provided on the outer peripheral wall of the outer tube 3. The inner peripheral wall of the outer tube 3 is in close contact with the raised portion of the outer peripheral wall of the inner tube 1, with reference to Figure 13 The specific connection method can be abutment or bonding, and sealing the contact parts of the two pipes will help prevent water leakage between the pipes. Figure 13 The inner circumferential wall of the outer tube 3, the outer circumferential wall of the inner tube 1 and the groove 2 cooperate to form a flow channel 4. The upper end of the flow channel 4 is connected to the water outlet pipe 5, and the lower end of the flow channel 4 is connected to the water inlet pipe 6.

[0085] The heating device provided in this embodiment can be used in other beverage heating equipment such as coffee machines. A constant flow water source is connected through the water inlet pipe 6. Water enters from the water inlet pipe 6 and flows along the flow channel 4 to the water outlet pipe 5. During the flow of water in the flow channel 4, the heating component 7 arranged on the outer wall of the outer tube 3 serves as a heat source for heat exchange with the water in the flow channel 4, thereby raising the water temperature to the specified requirements, and finally outputting hot water from the water outlet pipe 5.

[0086] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A heating device, characterized in that: include: An inner tube (1); the inner tube (1) comprises a hollow tube body (11); the outer peripheral wall of the tube body (11) is recessed in the direction of the axial center of the tube body (11) to form a groove (2); the position of the inner peripheral wall of the tube body (11) corresponding to the groove (2) is protruded in the direction of the axial center of the tube body (11); the groove (2) extends from the lower end of the outer peripheral wall of the tube body (11) to the upper end of the outer peripheral wall of the tube body (11), and the groove (2) adopts a circuitous bending structure; the cross-sectional width of the groove (2) close to the water inlet end of the tube body (11) is greater than the cross-sectional width of the groove (2) away from the water inlet end of the tube body (11); The circuitous bending structure is that the groove (2) includes a plurality of annular segments (23) located on the outer peripheral wall of the tube body (11), the plurality of annular segments (23) are arranged in sequence from bottom to top, adjacent annular segments (23) are respectively connected to a connecting segment (24), and the plurality of connecting segments (24) are staggeredly arranged in sequence from the lower end of the outer peripheral wall of the tube body (11) to the upper end of the outer peripheral wall of the tube body (11); The outer tube (3) is cylindrical and is sleeved on the outer peripheral wall of the tube body (11). The two ends of the outer tube (3) are respectively sealed with the two ends of the tube body (11). A heating component (7) is provided on the outer peripheral wall of the outer tube (3); The inner peripheral wall of the outer tube (3) is in close contact with the raised portion of the outer peripheral wall of the tube body (11); the inner peripheral wall of the outer tube (3), the outer peripheral wall of the tube body (11) and the groove (2) cooperate to form a flow channel (4); the upper end of the flow channel (4) is connected to a water outlet pipe (5), and the lower end of the flow channel (4) is connected to a water inlet pipe (6); The heating component (7) comprises an insulating layer (71), a heating resistor (72) and a terminal seat (73); the insulating layer (71) is arranged on the outer peripheral wall of the outer tube (3); the heating resistor (72) is printed on the insulating layer (71); the heating resistor (72) is distributed in a circuitous manner on the insulating layer (71); and the terminal seat (73) is installed on the outer peripheral wall of the outer tube (3); power supply pads (74) are provided at both ends of the heating resistor (72); the terminal seat (73) is provided with power supply terminals (75) for connecting to the power supply pads (74); the number of the power supply terminals (75) is the same as the number of the power supply pads (74); The heating component (7) further comprises a first temperature sensor (76) for detecting the outlet water temperature and a second temperature sensor (77) for detecting the heating resistor (72), wherein the first temperature sensor (76) and the second temperature sensor (77) are both arranged on the insulating layer (71); a common end of the first temperature sensor (76) and the second temperature sensor (77) is connected to a common soldering pad (78), the first temperature sensor (76) is connected to a first soldering pad (79), and the second temperature sensor (77) is connected to a second soldering pad (710); the power soldering pad (74) is arranged opposite to and spaced from the first soldering pad (79), the second soldering pad (710), and the common soldering pad (78); the terminal block (73) is provided with a common signal terminal (713) for connecting to the common soldering pad (78), a first signal terminal (711) for connecting to the first soldering pad (79), and a second signal terminal (712) for connecting to the second soldering pad (710); The water inlet pipe (6) is mounted on the inner peripheral wall of the tube body (11), and the inner peripheral wall of the tube body (11) is provided with a water inlet opening (8) for allowing the water inlet pipe (6) to communicate with the flow channel (4); the water outlet pipe (5) is mounted on the outer peripheral wall of the outer tube (3), and the outer tube (3) is provided with a water outlet opening (9) for allowing the water outlet pipe (5) to communicate with the flow channel (4).

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