Foot bath machine

Abstract

The utility model provides a kind of foot bath machine, including body and liquid heating module, and the cavity for containing foot bath liquid is equipped in body, liquid heating module includes liquid pipe, insulating heat conduction layer, heating element and shell cover, liquid pipe is made of metal material and inside is formed with the pipe hole of liquid flow, pipe hole is communicated with cavity, shell cover is sleeved in the outer periphery of liquid pipe, heating element is located between shell cover and liquid pipe, heating element and liquid pipe have spacing, insulating heat conduction layer includes insulating heat conduction powder, insulating heat conduction powder is filled between the outer surface of liquid pipe and shell cover, insulating heat conduction layer wraps heating element therein, shell cover is compacted to form insulating heat conduction layer by reducing diameter process to insulating heat conduction powder, the compaction density of insulating heat conduction layer after compaction is greater than the bulk density of insulating heat conduction powder under normal state. By reducing diameter of shell cover to compact insulating heat conduction powder, the thermal efficiency of insulating heat conduction layer is high, and foot bath liquid can be heated quickly.

Description

Technical Field

[0001] This utility model relates to the field of massage equipment, and in particular to a foot bath machine. Background Technology

[0002] In existing foot bath machines, the liquid heating module typically places the heating element inside a heating shell with a water heating chamber. The middle of the heating element is located inside the heating shell to heat the water in the chamber. The water enters the chamber through an opening at the top of the heating shell, is heated, and then flows out from the bottom of the chamber. Structurally, this liquid heating module results in uneven water heating and low thermal efficiency, with lower temperatures at the top and bottom of the heating shell and higher temperatures at the sides. Utility Model Content

[0003] To at least solve one of the above-mentioned technical problems, one objective of this utility model is to provide a foot bath machine with high heating efficiency and uniform heating.

[0004] The foot bath machine of this utility model includes a body and a liquid heating module. The body has a cavity for holding foot bath liquid. The liquid heating module includes a liquid pipe, an insulating and heat-conducting layer, a heating element, and a shell. The liquid pipe is made of metal and has a pipe hole formed inside through which liquid flows. The pipe hole communicates with the cavity. The shell is fitted around the outer periphery of the liquid pipe. The heating element is disposed between the shell and the liquid pipe, and there is a gap between the heating element and the liquid pipe. The insulating and heat-conducting layer includes insulating and heat-conducting powder. The insulating and heat-conducting powder is filled between the outer surface of the liquid pipe and the shell, and the insulating and heat-conducting layer encloses the heating element therein. The shell is formed by compacting the insulating and heat-conducting powder through a diameter reduction process. The compacted density of the insulating and heat-conducting layer after compaction is greater than the bulk density of the insulating and heat-conducting powder under normal conditions.

[0005] In this embodiment of the invention, the liquid pipe is placed inside the liquid heating module and a compacted insulating heat-conducting layer is provided between the heating element and the liquid pipe. The heat transfer effect of the compacted insulating heat-conducting layer is higher than that of the conventional stacked state. Therefore, the heating element transfers heat to the liquid pipe through the insulating heat-conducting layer with high efficiency, which can quickly heat the foot bath liquid. Moreover, the insulating heat-conducting layer is formed by compacting the insulating heat-conducting powder by reducing the diameter of the shell, which is convenient and efficient to manufacture.

[0006] In some embodiments, 2. the insulating thermally conductive powder is magnesium oxide powder, and the compaction density of the insulating thermally conductive layer is 2.5~3.5 g / cm³.

[0007] In some embodiments, the liquid heating module further includes a temperature sensing element, at least a portion of which is embedded within the insulating thermally conductive layer.

[0008] In some embodiments, the liquid heating module further includes a protective sleeve made of metal material, and the temperature sensing element is housed inside the protective sleeve.

[0009] In some embodiments, the liquid heating module further includes a temperature sensing element, the housing is made of metal material, the outer wall surface of the housing is provided with a mounting position, and the temperature sensing element is disposed at the mounting position.

[0010] In some embodiments, the shell is a hollow tubular structure with openings at both ends. The two ends of the shell are respectively provided with a first cover plate and a second cover plate to block the openings. Both the first cover plate and the second cover plate are provided with through holes, and the two ends of the liquid tube respectively pass through the two through holes.

[0011] In some embodiments, the first cover plate is provided with a positioning hole, and the liquid heating module further includes a temperature sensing element, at least a portion of which is embedded in the insulating thermally conductive layer, and a first end of which extends out from the positioning hole.

[0012] In some embodiments, the temperature sensing element includes a temperature controller and a temperature fuse. The first end of the temperature controller has a first electrical connection and is exposed. The second end of the temperature controller is embedded in the insulating and thermally conductive layer. The first end of the temperature fuse has a second electrical connection and is exposed. The second end of the temperature fuse is embedded in the insulating and thermally conductive layer.

[0013] In some embodiments, the heating element includes a heating tube with terminals at both ends, the heating tube is spirally wound around the outer periphery of the liquid tube, and the terminals extend out from both ends of the housing.

[0014] In some embodiments, the heating element includes a heating tube with terminals at both ends. The heating tube includes a first straight section, a second straight section, and a bent section. The first straight section and the second straight section are arranged adjacent to each other and are respectively connected to two terminals. The first straight section and the second straight section both extend in a straight line along the length direction of the liquid tube to the middle of the liquid tube and are respectively connected to the bent section. The bent section extends circumferentially around the liquid tube from the connection point with the first straight section to the second straight section. The bent section is formed as a continuous plurality of concave and convex structures.

[0015] In some embodiments, the body further includes an assembly cavity located below the cavity, the liquid heating module is installed in the assembly cavity, and the liquid pipe is connected to the cavity via a water pipe to form a circulating water path.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a liquid heating module according to one embodiment.

[0018] Figure 2 This is a cross-sectional schematic diagram of a liquid heating module according to one embodiment.

[0019] Figure 3 This is an exploded view of a liquid heating module according to one embodiment.

[0020] Figure 4 This is a schematic diagram of the liquid heating module according to another embodiment.

[0021] Figure 5 This is a cross-sectional schematic diagram of a liquid heating module according to another embodiment.

[0022] Figure 6 This is an exploded view of a liquid heating module according to another embodiment.

[0023] Figure 7 This is a cross-sectional schematic diagram of one embodiment of a foot bath machine.

[0024] Figure 8 This is a schematic diagram of the structure of a foot bath machine according to one embodiment.

[0025] Figure label: Body 1, cavity 11, assembly cavity 12, side cavity 13 Liquid heating module 2, liquid pipe 21, pipe hole 211, insulating heat-conducting layer 22, heating element 23, terminal block 231, first straight section 232, second straight section 233, bent section 234, housing 24, first cover plate 25, through hole 251, first positioning hole 252, second positioning hole 253, through hole 254, second cover plate 26, temperature controller 3, first electrical wiring 31, temperature fuse 4, second electrical connection wire 41, first protective sleeve 61, second protective sleeve 62, massage component 7, water pump 8, water inlet 91, water outlet 92, main control board 10 Detailed Implementation Although the present invention can be readily embodied in various forms of implementation, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is also understood that this specification should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0026] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0027] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, inside, outside, left, right, front, back, etc.) used to explain the structure and movement of the various components of this invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0028] It should also be noted that when the connection between components is described as "fixed to" or "set on" another component, the component can be directly on the other component or there may be an intervening component. When a component is described as "connected" to another component, it can be directly connected to the other component or indirectly connected to the other component.

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the description of the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0030] The preferred embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0031] This utility model foot bath machine, reference Figures 1 to 8As shown, the foot bath machine includes a body 1 and a liquid heating module 2. The body 1 has a cavity 11 for holding foot bath liquid. The liquid heating module 2 includes a liquid pipe 21, an insulating heat-conducting layer 22, a heating element and a shell 24. The liquid pipe 21 has a pipe hole 211 through which the liquid flows. The pipe hole 211 communicates with the cavity 11. The shell 24 is fitted around the outer periphery of the liquid pipe 21. The heating element is located between the shell 24 and the liquid pipe 21. The insulating and heat-conducting layer 22 includes insulating and heat-conducting powder, which fills the space between the outer surface of the liquid pipe 21 and the shell 24. There is a gap between the heating element and the liquid pipe. The insulating and heat-conducting layer 22 encloses the heating element, meaning the heating element is located inside the insulating material layer 22. The insulating material layer 22 directly contacts the liquid pipe 21 and the shell 24, while the heating element does not directly contact the liquid pipe 21. Therefore, the insulating and heat-conducting layer effectively insulates the heating element from the liquid pipe 21. Simultaneously, the insulating material layer 22 transfers heat from the heating element to the liquid pipe 21, which then transfers the heat to the foot bath liquid flowing through its orifice 211. By placing the liquid pipe inside the heating element, the heating element can heat the foot bath liquid inside the liquid pipe through the insulating and heat-conducting powder, resulting in high heating efficiency.

[0032] The liquid tubing is typically made of a metal with good thermal conductivity, which helps improve heat transfer efficiency and quickly transfers heat from the heating element to the foot bath liquid. The metal can be iron, stainless steel, aluminum, copper, or alloys of these materials. The outer casing is also usually made of a metal.

[0033] The shell 24 compacts the insulating thermally conductive powder using a diameter reduction process to form an insulating thermally conductive layer 22. The compacted density of the insulating thermally conductive layer 22 after compaction is greater than the bulk density of the insulating thermally conductive powder under normal conditions. The shell compacts the insulating thermally conductive layer using a diameter reduction process. This process compacts the powder filling the insulating thermally conductive layer between the shell and the liquid pipe. By assembling the insulating thermally conductive powder inside the shell and reducing the diameter of the shell using the diameter reduction process, the insulating thermally conductive powder is compacted. This makes it easy to assemble the insulating thermally conductive powder and facilitates the formation of a compact insulating thermally conductive layer, resulting in high manufacturing efficiency.

[0034] Because the compacted insulating and heat-conducting layer reduces or even eliminates the gaps between powder particles, the powder particles are tightly bonded together. This results in better thermal conductivity of the insulating and heat-conducting layer, which can conduct more heat from the heater to the water pipe more quickly, thus heating the foot bath liquid flowing through the pipe more rapidly.

[0035] The specific liquid heating module can be directly installed in the cavity, for example, the liquid heating module can be installed in a concave cavity, with both ends of the liquid pipe extending into the cavity. Of course, it is best to keep both ends of the liquid pipe away from the foot area in the cavity to avoid scalding the feet by the heated water. Preferably, the liquid heating module is placed outside the cavity, for example, it can be placed in an assembly cavity located below the cavity on the machine body.

[0036] Magnesium oxide powder possesses excellent insulation properties and high thermal conductivity. In some preferred embodiments, magnesium oxide powder is selected as the insulating and thermally conductive powder, and the compacted density of the insulating and thermally conductive layer 22 can be 2.5~3.5 g / cm³. Magnesium oxide powder is a very good insulating and thermally conductive material. The density of magnesium oxide powder in its packed state under normal pressure is approximately 0.2~0.5 g / cm³, and after compaction, the density increases to the range of 2.5~3.5 g / cm³. On the one hand, this density range can meet the requirements of relatively rapid heat conduction; on the other hand, it is easy to process, as this compaction can be achieved without a long pressing time, ensuring the manufacturing efficiency of the heating element.

[0037] If the shell diameter before the diameter reduction process is 6mm (tube thickness 1mm, hollow cavity 4mm), the insulating and thermally conductive powder that can be filled is magnesium oxide powder, with a filling thickness of 4mm. At this time, the magnesium oxide powder is in a relatively loosely packed state under normal pressure, with a bulk density of 0.5g / cm³. By reducing the diameter of the shell to 4.5mm through the diameter reduction process, the thickness of the magnesium oxide powder becomes 2.5mm, and the compacted density of the magnesium oxide powder after compaction is 3.5g / cm³.

[0038] The liquid heating module 2 also includes a temperature sensing element, at least a portion of which is embedded within the insulating and thermally conductive layer 22. Embedding the temperature sensing element within the insulating and thermally conductive layer means that the layer can wrap and fix the temperature sensing element, eliminating the need for an additional assembly structure and simplifying the structure of the liquid heating module. Furthermore, the close contact between the temperature sensing element and the insulating and thermally conductive layer ensures more accurate temperature measurement.

[0039] Specifically, the temperature sensor can be entirely embedded within the insulating and heat-conducting layer 22, as long as the terminals of the temperature sensor or its built-in electrical wiring extend to the outside, allowing the temperature sensor to form an electrical connection with other electrical components (such as the main control board of a foot bath machine). Alternatively, the temperature sensor can be partially embedded within the insulating and heat-conducting layer 22, with a portion exposed outside, which also secures the temperature sensor.

[0040] Temperature sensing devices can be one or more different types of temperature sensing, temperature control, and other temperature elements. For example, a temperature sensing device may include a temperature controller, such as a reset temperature controller, which can disconnect the circuit when the current temperature exceeds a preset temperature, causing the heating element to stop heating, and then restore the circuit connection when the temperature drops to a certain level, allowing the heating element to continue working; a temperature sensing device may also include a temperature fuse, which melts and disconnects the circuit when the temperature is abnormal, preventing the heating element from continuing to work.

[0041] like Figure 3 and Figure 6As shown, the liquid heating module 2 also includes a protective sleeve made of metal. The temperature sensing element is housed within the protective sleeve, at least partially within the insulating thermally conductive layer 22. Alternatively, a protective sleeve can be provided that completely covers the temperature sensing element. By placing the protective sleeve around the temperature sensing element, it protects the element from damage during casing diameter reduction. When the temperature sensing element has multiple temperature elements, the number of protective sleeves corresponds to the number of temperature elements. The metal material of the protective sleeve allows for greater heat transfer from the insulating thermally conductive layer to the temperature sensing element, preventing heat loss and inaccurate temperature readings. The housing 24 is a hollow tubular structure with openings at both ends. A first cover plate 25 and a second cover plate 26 are respectively provided at both ends of the housing 24 to seal the openings. Both the first cover plate 25 and the second cover plate 26 have through holes 251, through which the liquid tube 21 extends. By sealing the openings at the ends of the housing with the first and second cover plates, the two ends of the insulating and heat-conducting layer are sealed, thus encapsulating and fixing the insulating and heat-conducting layer inside the housing. The liquid tube extends through the through holes of the first and second cover plates, exposing both ends of the liquid tube for easy connection to the water pipe. The through holes also allow for positioning of the liquid tube, preventing it from shifting when the housing diameter decreases or when subjected to other external forces. This ensures a stable distance between the liquid tube and the heating element, guaranteeing the insulation effect between them.

[0042] The first cover plate 25 has positioning holes. The liquid heating module 2 also includes a temperature sensing element, at least part of which is embedded in the insulating and heat-conducting layer 22. The first end of the temperature sensing element protrudes from the positioning hole, allowing it to be fixed by the insulating and heat-conducting layer while the exposed end can be easily connected to other electrical components on the foot bath machine, facilitating maintenance and replacement. Typically, the first end of the temperature sensing element is the end with electrical wiring. Furthermore, the positioning holes can position the temperature sensing element, preventing it from shifting when the casing diameter is reduced or when subjected to other external forces.

[0043] The temperature detection components include a temperature controller 3 and a temperature fuse 4. The temperature controller 3 is typically a temperature controller with a reset function, effectively controlling whether the heating element heats up based on the temperature set by the user on the foot bath machine. This allows the water temperature within the foot bath machine to be regulated within a small range, achieving a constant temperature effect. The temperature fuse 4 melts in case of abnormal temperature, stopping the heating element from heating. By integrating a temperature controller and a temperature fuse into the liquid heating module, heating can be disconnected in case of overheating, reducing the risk of burns or dry burning caused by abnormal temperatures, making the product safer and more reliable. Furthermore, under normal operating conditions, the temperature is controlled within a suitable range, improving the comfort of the water temperature during foot bath machine use.

[0044] The shape of the positioning hole is adapted to the shape of the temperature sensing element. When the temperature sensing element includes a temperature controller 3 and a temperature fuse 4, the positioning hole on the first cover plate 25 can have two corresponding holes, including a first positioning hole 252 adapted to the temperature sensor 3 and a second positioning hole 253 adapted to the temperature fuse 4.

[0045] The shape of the protective sleeve is also adapted to the shape of the temperature sensing element. When the temperature sensing element includes a temperature controller 3 and a temperature fuse 4, the protective sleeve can have two corresponding protective sleeves, including a first protective sleeve 61 adapted to the temperature controller and a second protective sleeve 62 adapted to the temperature fuse 4.

[0046] like Figure 3 and Figure 6 As shown, the temperature controller 3 has a first electrical connection 31 at its first end, which is exposed. The second end of the temperature controller 3 is embedded in the insulating and heat-conducting layer 22. The temperature controller 3 is covered by a first protective sleeve 61, which at least protects the portion of the temperature controller 3 located within the insulating and heat-conducting layer 22 from damage. This design allows the temperature controller to be fixed in place by the insulating and heat-conducting layer, while the exposed end can be easily connected to other electrical components on the foot bath machine, facilitating maintenance and replacement of the temperature controller. The positioning hole allows for positioning of the temperature controller, preventing it from shifting when the casing diameter is reduced or when subjected to other external forces.

[0047] The first end of the thermal fuse 4 has a second electrical connection 41, which is exposed. The second end of the thermal fuse 4 is embedded in the insulating and heat-conducting layer 22. The thermal fuse 4 is covered by a second protective sleeve 62, which at least protects the portion of the thermal fuse 4 located within the insulating and heat-conducting layer 22 from damage. This design allows the thermal fuse to be fixed in place by the insulating and heat-conducting layer, while the exposed end can be easily connected to other electrical components on the foot bath machine, facilitating maintenance and replacement of the thermal fuse. The positioning hole can position the thermal fuse, preventing it from shifting when the housing diameter is reduced or when subjected to other external forces.

[0048] In some embodiments, such as Figures 1-3As shown, the heating element includes a heating tube 23 with terminals 231 at both ends. The heating tube 23 is spirally wound around the outer circumference of the liquid tube. The spiral shape of the heating tube 23 helps to extend the actual length of the heating tube and can heat the entire circumference of the liquid tube, resulting in good heating uniformity and high heating efficiency. The terminals 231 of the heating tube 23 extend from both ends of the housing 24, so that the spiral of the heating tube extends from one end of the housing to the other along the length of the housing, effectively heating the entire liquid tube inside the housing, resulting in a large heating area and rapid heating of the foot bath liquid. Specifically, both the first cover plate 25 and the second cover plate 26 are provided with through holes 254. The two ends of the heating tube 23 pass through the through holes 254 and extend out of the two ends of the housing 24. The through holes 254 also serve to limit the movement of the heating tube.

[0049] In other embodiments, such as Figures 4-6 As shown, the shape of the heating element is similar to... Figures 1-3 The heating element differs slightly from the original. It includes a heating tube 23 with terminals 231 at both ends. The heating tube 23 includes a first straight section 232, a second straight section 233, and a bent section 234. The first straight section 232 and the second straight section 233 are adjacent to each other and connected to the two terminals 231 respectively. Both the first straight section 232 and the second straight section 233 extend linearly along the length of the liquid pipe 21 to the middle of the liquid pipe 21. Their extended rear ends are connected to the bent section 234. The bent section 234 extends circumferentially around the liquid pipe 21 from the connection point with the first straight section 232 to the second straight section 233. The bent section 234 forms a continuous series of undulating structures. The undulating structure of the bent section effectively lengthens the actual length of the heating tube, forming a concentrated heating zone around the liquid pipe where the bent section surrounds, enabling the water to be heated instantly and rapidly with high heating efficiency. In this embodiment, the first straight section 232 and the second straight section 233 are both located at the same end of the housing 24. Only the first cover plate 25 is provided with two through holes 254. The ends of the first straight section 232 connected to the terminal 231 and the ends of the second straight section 233 connected to the terminal 231 pass through the through holes 254 and extend out of both ends of the housing 24. The through holes 254 also serve to limit the heating element.

[0050] The body 1 has an assembly cavity 12 for assembling the massage component 7 and its drive structure, and may also have a side cavity 13 on the side of the cavity 11. The assembly cavity 12 is usually connected to the side cavity 13. The liquid heating module 2 is preferably installed in the assembly cavity 12 below the cavity 11. The liquid pipe 21 is connected to the cavity 11 via a water pipe to form a circulating water path. The circulating water path has an inlet 91, an outlet 92, and a water pump 8. The water pump 8 can be located at any position in the circulating water path to accelerate water circulation. Figure 7As shown by the middle arrow, the foot bath water in the cavity 11 enters through the inlet 91, flows through the liquid pipe, is heated, and then flows out through the outlet 92 back into the cavity 11. Because the assembly cavity is isolated from the cavity containing the foot bath water, this design solves the problem of waterproofing the terminals, temperature controller, and other electrical components of the liquid heating module. It also facilitates the connection of the liquid heating module to electrical components in the assembly cavity or those located in the side cavity, for example... Figure 7 As shown, this facilitates connection with the main control board 10 in the side cavity 13. Of course, the main control board can also be located in the assembly cavity 12.

[0051] In some embodiments, the liquid heating module 2 further includes a temperature sensing element. The housing 24 is made of a metal material with good thermal conductivity, and the outer wall surface of the housing 24 has a mounting position where the temperature sensing element is located. If the housing 24 is thick, the mounting position can be a groove formed by an inward recess on the outer wall surface of the housing. The mounting position can also be a structure such as a buckle on the outer wall surface of the housing, which can be used to fix the temperature sensing element by fastening it. This assembly method can also fix the temperature sensing element to the housing, and indirectly measure the temperature by measuring the temperature of the housing. Since the housing is made of a metal material with good thermal conductivity, heat loss is reduced, and the temperature measurement is more accurate.

[0052] Although this application has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Because this application can be embodied in many forms without departing from the spirit or essence of the embodiments, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A foot bath machine, characterized by, The device includes a body and a liquid heating module. The body has a cavity for holding foot bath liquid. The liquid heating module includes a liquid pipe, an insulating and heat-conducting layer, a heating element, and a shell. The liquid pipe is made of metal and has internal holes through which the liquid flows. The holes communicate with the cavity. The shell is fitted around the outer periphery of the liquid pipe. The heating element is located between the shell and the liquid pipe, with a gap between them. The insulating and heat-conducting layer includes insulating and heat-conducting powder, which fills the space between the outer surface of the liquid pipe and the shell, enclosing the heating element. The shell is formed by compacting the insulating and heat-conducting powder through a diameter reduction process. The compacted density of the insulating and heat-conducting layer after compaction is greater than the bulk density of the insulating and heat-conducting powder under normal conditions.

2. The foot bath machine according to claim 1, characterized in that, The insulating and thermally conductive powder is magnesium oxide powder, and the compaction density of the insulating and thermally conductive layer is 2.5~3.5 g / cm³.

3. The foot bath machine according to claim 1, wherein The liquid heating module also includes a temperature sensing element, at least a portion of which is embedded within the insulating and thermally conductive layer.

4. The foot bath machine according to claim 3, characterized in that, The liquid heating module also includes a protective sleeve made of metal, and the temperature sensing element is housed inside the protective sleeve.

5. The foot bath machine according to claim 1, wherein The liquid heating module also includes a temperature detection element. The housing is made of metal material, and the outer wall of the housing has a mounting position, where the temperature detection element is located.

6. The foot bath machine according to claim 1, wherein The shell is a hollow tubular structure with openings at both ends. The two ends of the shell are respectively provided with a first cover plate and a second cover plate to seal the openings. Both the first cover plate and the second cover plate are provided with through holes. The two ends of the liquid tube pass through the two through holes respectively.

7. The foot bath machine according to claim 6, wherein The first cover plate is provided with a positioning hole, and the liquid heating module further includes a temperature detection element, at least a portion of which is embedded in the insulating thermally conductive layer, and the first end of which extends out from the positioning hole.

8. The foot bath machine according to any one of claims 3-5 or 7, wherein, The temperature detection device includes a temperature controller and a temperature fuse. The first end of the temperature controller has a first electrical connection and is exposed. The second end of the temperature controller is embedded in the insulating and heat-conducting layer. The first end of the temperature fuse has a second electrical connection and is exposed. The second end of the temperature fuse is embedded in the insulating and heat-conducting layer.

9. The foot bath machine according to claim 1, wherein The heating element includes a heating tube with terminals at both ends. The heating tube is spirally wound around the outer circumference of the liquid tube, and the terminals extend out from both ends of the housing.

10. The foot bath machine according to claim 1, wherein The heating element includes a heating tube with terminals at both ends. The heating tube includes a first straight section, a second straight section, and a bent section. The first straight section and the second straight section are arranged adjacent to each other and are respectively connected to two terminals. The first straight section and the second straight section extend in a straight line along the length of the liquid tube to the middle of the liquid tube and then connect to the bent section. The bent section extends circumferentially around the liquid tube from the connection point with the first straight section to the second straight section. The bent section is formed into a continuous plurality of concave and convex structures.

11. The foot bath machine according to claim 1, wherein The body also includes an assembly cavity located below the container cavity, the liquid heating module is installed in the assembly cavity, and the liquid pipe is connected to the container cavity through a water pipe to form a circulating water circuit.

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