Liquid heater

Abstract

The liquid heater comprises a metal tube, a glass tube and a switching assembly arranged between the metal tube and the glass tube in a sleeving mode, the switching assembly comprises a silicone tube and a plastic tube, the silicone tube is connected outside the plastic tube in a sleeving mode, and the plastic tube is provided with an isolation step protruding inwards in the radial direction; the water outlet end of the metal pipe and the water inlet end of the glass pipe are located on the two opposite sides of the isolation step in the axial direction of the plastic pipe, one of the water outlet end of the metal pipe and the water inlet end of the glass pipe stretches into the plastic pipe and abuts against one side of the isolation step, and the other one of the water outlet end of the metal pipe and the water inlet end of the glass pipe is located on the other side of the isolation step. Therefore, stress concentration caused by direct contact between the metal tube and the glass tube can be avoided, and the risk that the glass tube is broken in the installation and use process is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of household appliances, and particularly relates to a liquid heater. BACKGROUND

[0002] With the strengthening of people's awareness of healthy life, the requirement for the health of the waterway of the liquid heater is also increasing. Patent document CN202223587127.7 discloses an electric thermos bottle, which comprises an inner container and a water outlet assembly. The bottom of the inner container is provided with a water outlet. The water outlet assembly comprises a water pump, a glass tube and a water outlet nozzle. The water pump is in communication with the water outlet. The glass tube is connected between the water pump and the water outlet nozzle to facilitate the user to judge the water level in the inner container by observing the water level of the glass tube. The glass tube and the water outlet joint of the water pump are connected through a silica gel tube. The silica gel tube is provided with a plastic tube. The water inlet end of the plastic tube is in butt joint with the water outlet joint of the water pump, and the water outlet end is in interference fit with the water inlet end of the glass tube. By reducing the probability of the silica gel tube contacting water, the influence of the odor of the silica gel tube and the odor absorbed by the silica gel tube on the water outlet is reduced, and the odor of the water outlet is reduced. In other words, the electric thermos bottle connects the water outlet joint of the water pump and the glass tube through a long plastic tube. However, when the plastic tube is heated at a high temperature above 80 DEG C, a large amount of harmful substances such as polyvinyl chloride and phthalate will be precipitated. When the long waterway passes through the glass tube, the harmful substances precipitated at high temperature are harmful to human health. Moreover, the plastic tube is prone to aging and deformation under long-term high-temperature use, which leads to unstable connection of the waterway and may cause water leakage.

[0003] The glass tube and the metal tube have higher high-temperature resistance and corrosion resistance. Therefore, the prior art gradually adopts the connection of the metal tube and the glass tube to realize the waterway communication between the water outlet of the water pump and the water outlet nozzle. However, due to the large difference in the thermal expansion coefficients of the metal tube and the glass tube, the expansion and contraction degrees of the metal tube and the glass tube are different when the temperature changes. If the metal tube and the glass tube are directly connected, stress concentration will occur at the connection position of the two, which will further cause the glass tube to break. Moreover, when the metal tube and the glass tube are directly connected, it is necessary to strictly ensure that the metal tube and the glass tube are on the same axis, otherwise the glass tube is prone to breakage. In addition, due to the difference in the material properties of the two, it is difficult to ensure the sealing performance between the two at high temperature. Therefore, how to realize the connection between the metal tube and the glass tube and ensure the sealing performance at the connection position of the two has become a technical problem to be solved in the field. UTILITY MODEL CONTENT

[0004] The application provides a liquid heater to solve the technical problem that the glass tube is prone to breakage when the metal tube and the glass tube are assembled in the mutual plug-in mode due to the large difference in the thermal expansion coefficients between the two when the existing liquid heater adopts the metal tube and the glass tube for waterway communication.

[0005] The technical scheme adopted in the present application is as follows:

[0006] The liquid heater comprises a metal pipe, a glass pipe and an adapter assembly sleeved between the metal pipe and the glass pipe, the adapter assembly comprises a silica gel pipe and a plastic pipe, the silica gel pipe is sleeved outside the plastic pipe, the plastic pipe is provided with an isolation step protruding radially inward, the water outlet end of the metal pipe and the water inlet end of the glass pipe are located on opposite sides of the isolation step along the axial direction of the plastic pipe, and one of the water outlet end of the metal pipe and the water inlet end of the glass pipe protrudes into the plastic pipe and abuts against one side of the isolation step, and the other of the water outlet end of the metal pipe and the water inlet end of the glass pipe is located on the other side of the isolation step.

[0007] In the present application, the water outlet end of the metal pipe and the water inlet end of the glass pipe are located on opposite sides of the isolation step of the plastic pipe, and the isolation step is arranged to avoid direct contact between the metal pipe and the glass pipe. One of the water outlet end of the metal pipe and the water inlet end of the glass pipe protrudes into the plastic pipe and abuts against one side of the isolation step, and the other of the water outlet end of the metal pipe and the water inlet end of the glass pipe is located on the other side of the isolation step, thereby avoiding stress concentration caused by direct contact between the metal pipe and the glass pipe and reducing the risk of glass pipe breakage during installation and use. Moreover, in the present application, the metal pipe and the glass pipe are connected by the plastic pipe and the silica gel pipe, which can reduce the requirement for coaxiality of the metal pipe and the glass pipe during assembly and reduce the assembly difficulty. Furthermore, one of the water outlet end of the metal pipe and the water inlet end of the glass pipe protrudes into the plastic pipe and abuts against one side of the isolation step, and the other of the water outlet end of the metal pipe and the water inlet end of the glass pipe is located on the other side of the isolation step, which can greatly reduce the contact area between the water path and the plastic pipe, thereby reducing the damage of the plastic pipe to the water quality under high temperature. In addition, the silica gel pipe can not only prevent water leakage and ensure the sealing performance of the connection position of the metal pipe and the glass pipe, but also can position the plastic pipe, realizing function integration.

[0008] The isolation step continuously extends along the circumferential direction of the inner periphery of the plastic pipe to form a closed ring structure.

[0009] In the present application, the isolation step has a closed ring structure, which can reduce the processing difficulty of the plastic pipe and improve the processing efficiency of the plastic pipe on the one hand, and on the other hand, when water flows out of the metal pipe and flows through the isolation step, it can pass through a complete annular surface, avoiding the existence of gaps and making the water flow become turbulent, which not only ensures the smoothness of the water flow, but also reduces the noise problem caused by turbulence.

[0010] The silica gel pipe has a stop step protruding radially inward to abut against the plastic pipe.

[0011] The silica gel tube in the present application needs to provide an installation channel for the installation of the plastic tube, prevent water leakage after the connection of the plastic tube and the metal tube, and prevent water leakage after the connection of the plastic tube and the glass tube, and is different from the prior art in which only a plastic tube is internally arranged in the silica gel tube. In the present application, the water outlet end of the metal tube and the water inlet end of the glass tube also need to extend into the silica gel tube, so the plastic tube only occupies part of the space in the silica gel tube. The position of the plastic tube as an intermediate medium between the metal tube and the glass tube in the silica gel tube is particularly important. In the technical solution, the internal stop step of the silica gel tube can ensure that the silica gel tube and the plastic tube are tightly fitted, prevent the silica gel tube and / or the plastic tube from being displaced or sliding due to water flow impact or external force during use, thereby improving the stability of the entire waterway connection structure. On the other hand, the abutment of the stop step and the plastic tube forms a reliable sealing point, further enhancing the sealing performance at the connection position, which can effectively prevent water leakage. In addition, the stop step enables the plastic tube to be quickly positioned and fixed in the silica gel tube during installation, reducing the difficulty of centering during installation and improving assembly efficiency.

[0012] The water outlet end of the metal tube extends into the plastic tube, and the inner wall surface of the water outlet end of the metal tube is axially flush with the inner wall surface of the isolation step; or the water inlet end of the glass tube extends into the plastic tube, and the inner wall surface of the water inlet end of the glass tube is axially flush with the inner wall surface of the isolation step.

[0013] In the technical solution, by keeping the inner wall surface of the water outlet end of the metal tube axially flush with the inner wall surface of the isolation step or keeping the inner wall surface of the water inlet end of the glass tube axially flush with the inner wall surface of the isolation step, vortex can be avoided at the butt joint position of the metal tube and the plastic tube or at the butt joint position of the glass tube and the plastic tube due to misalignment, thereby ensuring the smoothness of the water flow and reducing the noise during the flow of the water flow.

[0014] The water outlet end of the metal tube extends into the plastic tube, the water inlet end of the glass tube abuts the other side of the isolation step, and the inner diameter of the metal tube is smaller than the inner diameter of the glass tube.

[0015] In the technical solution, the inner diameter of the metal tube is smaller than the inner diameter of the glass tube, so that the water flow naturally spreads when entering the glass tube, reducing the turbulence and resistance of the water flow, reducing the probability of bubble generation, optimizing the water flow path, and improving the stability of the water flow, thereby making the water outlet at the water outlet nozzle of the liquid heater more stable and improving the user experience. Moreover, the inner diameter of the metal tube is smaller than the inner diameter of the glass tube, so that the water flow has a buffer area when entering the glass tube, which can effectively buffer the sudden change of water pressure and reduce the influence of water pressure fluctuation on the sealing performance at the switching position.

[0016] The plastic pipe has a pipe mouth part for the water outlet end of the metal pipe or the water inlet end of the glass pipe to extend into, and the pipe mouth part is provided with a guide surface.

[0017] The pipe mouth part is provided with a guide surface, so that the metal pipe or the glass pipe can be conveniently inserted into the plastic pipe, and the assembly efficiency of the metal pipe or the glass pipe and the plastic pipe is improved.

[0018] The inner diameter of the plastic pipe gradually decreases from the end far away from the isolation step to the end close to the isolation step.

[0019] The inner diameter of the plastic pipe gradually decreases from the end far away from the isolation step to the end close to the isolation step, so that a flared structure is formed in the plastic pipe, and the metal pipe or the glass pipe is more easily centered during installation, the installation difficulty is reduced, and the assembly efficiency is improved.

[0020] The liquid heater further comprises a light emitting piece, the silica gel pipe is provided with a positioning part for mounting the light emitting piece, the positioning part has a light guide groove matched with the light emitting piece, the silica gel pipe has a sealing segment sleeved outside the glass pipe, and light emitted by the light emitting piece is transmitted into the glass pipe through the light guide groove and the sealing segment.

[0021] The function of the silica gel tube in the prior art liquid heater is single, only having the function of preventing water leakage after connecting two pipelines, in order to further improve the user experience, the requirement of the function diversity of the existing liquid heater is increasing, for example, some liquid heaters need to have night vision function to facilitate users to clearly understand the display information on the operation panel in the case of weak light, and for example, some liquid heaters need to have residual water display function, according to the principle of communicating vessel, the glass tube in the present application can be used to indicate the residual water level of the inner container of the liquid heater, but in the case of weak light, the user needs to exert enough attention to see the water level in the glass tube, which reduces the user experience, in order to solve such problems, some liquid heaters in the prior art add a light emitting piece near the glass tube in the body, and separately set an installation structure for installing the light emitting piece, such setting not only increases the installation space requirement and cost, but also puts forward higher requirements on the relative position between the installation structure and the glass tube during assembly. The technical scheme sets a positioning part for installing the light emitting piece on the silica gel tube, which can realize the function integration of the silica gel tube. The sealing performance of the sealing section of the silica gel tube can ensure the sealing between the light emitting piece and the glass tube, prevent water from penetrating into the light emitting piece, and improve the stability and reliability of the operation of the light emitting piece. The setting of the light guide groove on the positioning part can effectively conduct the light emitted by the light emitting piece, reduce the light loss, and improve the light efficiency. Through the light guide groove and the sealing section, the light emitted by the light emitting piece can enter the glass tube, which not only improves the decorative effect, but also helps users to quickly find the position of the liquid heater in the night or in the environment with weak light, and improves the user experience. Since the glass tube has the function of indicating the water level of the inner container, the light emitted by the light emitting piece illuminates the glass tube, which can help users to more conveniently observe the water level in the glass tube. Of course, the specific function of the light emitting piece is not limited, which can be used to indicate the water temperature, water level or the current running state of the liquid heater, for example, through different colored lights to prompt hot water or cold water.

[0022] The axial direction of the light guide groove and the axial direction of the sealing section are arranged at an obtuse angle.

[0023] In order to make the glass tube display the water level in the inner container of the liquid heater as much as possible, the visible area of the glass tube needs to occupy a certain extension height in the vertical direction. If the straight incidence mode is adopted between the light guide groove and the sealing section, in order to make the light irradiate the visible area of the glass tube as much as possible, the light emitting piece needs to be arranged as much as possible along the height direction of the glass tube to realize the uniformity of the light, which undoubtedly increases the cost. In the technical scheme, the axis direction of the light guide groove and the axis direction of the sealing section are arranged at an obtuse angle, which can make the light better diffuse in the light guide groove, reduce the problem of local over-brightness or over-darkness caused by direct incidence, and make the light distribution in the whole glass tube more uniform. Moreover, the obtuse angle arrangement increases the reflection times of the light in the light guide groove, so that the light can fully utilize the length of the light guide groove, improves the light energy utilization rate, to ensure that more light is guided into the glass tube, and reduces the light loss.

[0024] The liquid heater further comprises a body, a water storage container and a water outlet nozzle, the metal pipe is communicated with the water storage container, the glass tube is communicated with the water outlet nozzle, and the body is provided with a visible area opposite to the position of the glass tube and extending along the length direction of the glass tube.

[0025] In the technical scheme, the visible area opposite to the position of the glass tube and extending along the length direction of the glass tube is arranged on the body, so that the user can more clearly and intuitively observe the water level change in the glass tube through the visible area, and timely understand the remaining water condition in the water storage container, the user can add water according to the actual condition, and the use experience of the user is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0027] Figure 1 It is a sectional view of the partial structure of the liquid heater under one embodiment of the present application;

[0028] Figure 2 It is Figure 1 the enlarged view of A part;

[0029] Figure 3 It is an exploded view of the partial structure of the liquid heater under one embodiment of the present application.

[0030] Among them,

[0031] 1, metal pipe;

[0032] 2, plastic pipe; 21, isolation step; 22, pipe opening part;

[0033] 3, glass tube;

[0034] 4. Silicone tube; 41. Positioning portion; 42. Light guide groove; 43. Sealing section; 44. Stop step;

[0035] 5. Light emitting member. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the overall concepts of the present application, the following will be described in detail with reference to the accompanying drawings.

[0037] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details and other implementations can be employed. In other instances, well-known methods have not been described in detail in order to avoid obscuring the present application. It will be appreciated that embodiments of the present application can be combined with one another, and features of the embodiments can be combined with one another, unless the context clearly dictates otherwise.

[0038] In addition, in the description of the present application, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like refer to the spatial or positional relationships as shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0039] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection", "fixed", and the like should be broadly interpreted, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] AsFigure 1 and Figure 2 As shown in

[0042] In the present application, the relative position relationship between the metal pipe 1, the plastic pipe 2 and the glass pipe 3 can adopt any one of the following embodiments:

[0043] Embodiment one: as shown in Figure 1 and Figure 2 The water outlet end of the metal pipe 1 extends into the plastic pipe 2 and abuts against one side of the isolation step 21, and the water inlet end of the glass pipe 3 is located on the other side of the isolation step 21.

[0044] In the present embodiment one, the more specific relative position relationship between the glass pipe 3 and the plastic pipe 2 can adopt any one of the following embodiments:

[0045] Embodiment one: as shown in Figure 1 and Figure 2 The isolation step 21 is located at one end of the plastic pipe 2, and the glass pipe 3 is located outside the plastic pipe 2 and abuts against the outer end surface of the plastic pipe 2. In this way, the water outlet end of the metal pipe 1 abuts against one end surface of the isolation step 21, and the water inlet end of the glass pipe 3 abuts against the other end surface of the isolation step 21, thereby greatly reducing the contact area between the plastic pipe 2 and the water flow, and reducing the influence of the plastic pipe 2 on the water quality under high temperature conditions.

[0046] Moreover, in the present embodiment one, the glass pipe 3 and the plastic pipe 2 only abut against each other in the axial direction, and there is no radial connection relationship between them. The relative position relationship between the glass pipe 3 and the plastic pipe 2 can rely on the fastening effect of the external silica gel pipe 4 on the glass pipe 3 and the plastic pipe 2. During assembly, after the plastic pipe 2 is installed to the preset installation position in the silica gel pipe 4, only the glass pipe 3 needs to be inserted into the silica gel pipe 4 and abut against the plastic pipe 2, which greatly reduces the assembly difficulty, especially when there is a bent pipe at either of the metal pipe 1 and / or the glass pipe 3 at the connection position thereof, the present embodiment one can greatly reduce the assembly difficulty between the metal pipe 1, the plastic pipe 2, the glass pipe 3 and the silica gel pipe 4, and improve the assembly efficiency.

[0047] Example 2: This example 2 is not illustrated. In this example 2, the isolation step is located inside the plastic tube and is a certain distance away from the end of the plastic tube. The water inlet end of the glass tube also extends into the plastic tube to abut against the isolation step, or the water inlet end of the glass tube also extends into the plastic tube and is a certain distance away from the isolation step.

[0048] Implementation Method 2: This implementation method is not illustrated. In this implementation method, the water inlet end of the glass tube extends into the plastic tube and abuts against one side of the isolation step, while the water outlet end of the metal tube is located on the other side of the isolation step.

[0049] Of course, in this second embodiment, the more specific relative positional relationship between the metal tube and the plastic tube can be referred to in the above embodiments 1 and 2, and will not be repeated here.

[0050] Regardless of whether it is Embodiment 1 or Embodiment 2, the outlet end of the metal tube 1 and the inlet end of the glass tube 3 are located on opposite sides of the isolation step 21 of the plastic tube 2. The isolation step 21 prevents direct contact between the metal tube 1 and the glass tube 3. One of the outlet end of the metal tube 1 and the inlet end of the glass tube 3 extends into the plastic tube 2 and abuts against one side of the isolation step 21, while the other is located on the other side of the isolation step 21. This avoids stress concentration caused by direct contact between the metal tube 1 and the glass tube 3, reducing the risk of the glass tube 3 breaking during installation and use. Furthermore, the use of the plastic tube 2 and silicone tube 4 as a connector between the metal tube 1 and the glass tube 3 reduces the requirements for coaxiality between the metal tube 1 and the glass tube 3 during assembly, thus simplifying the assembly process. Furthermore, the fact that one of the outlet end of the metal pipe 1 and the inlet end of the glass pipe 3 extends into the plastic pipe 2 and abuts against one side of the isolation step 21, while the other end is located on the other side of the isolation step 21, significantly reduces the contact area between the water path and the plastic pipe 2, thereby reducing the damage to water quality caused by the plastic pipe 2 under high temperatures. In addition, the silicone tube 4 serves both to prevent leakage, ensuring the sealing performance at the junction of the metal pipe 1 and the glass pipe 3, and to position the plastic pipe 2, achieving functional integration.

[0051] The isolation step 21 in this application can be configured in any of the following embodiments:

[0052] Implementation Method 3: For example Figure 3 As shown, the isolation step 21 extends continuously along the inner periphery of the plastic tube 2 in a closed loop structure. The closed loop structure of the isolation step 21 reduces the processing difficulty of the plastic tube 2 and improves its processing efficiency. Furthermore, when water flows from the metal tube 1 and through the isolation step 21, it passes through a complete loop, preventing turbulent flow caused by gaps or other obstructions. This ensures smooth water flow and reduces noise problems caused by turbulence.

[0053] Embodiment four: In the embodiment four, which is not shown, the isolation step is spaced along the inner periphery of the plastic tube. The plurality of isolation steps cooperate to form an abutting fit with the outlet end of the metal tube or the inlet end of the glass tube.

[0054] As a preferred embodiment of the present application, as shown in Figure 2 and Figure 3 , the silica gel tube 4 has a stop step 44 protruding radially inward to abut against the plastic tube 2. The provision of the stop step 44 in the silica gel tube 4 can ensure the close fit between the silica gel tube 4 and the plastic tube 2, prevent the silica gel tube 4 and / or the plastic tube 2 from being displaced or sliding due to water flow impact or external force during use, thereby improving the stability of the entire waterway connection structure. On the other hand, the abutment of the stop step 44 against the plastic tube 2 forms a reliable sealing point, further enhancing the sealing performance at the connection position, which can effectively prevent water leakage. In addition, the stop step 44 enables the plastic tube 2 to be quickly positioned and fixed in the silica gel tube 4 during installation, reducing the difficulty of centering during installation and improving the assembly efficiency.

[0055] The isolation step 21 is provided with a through hole for water flow. In the present application, the inner diameter of the metal tube 1, the inner diameter of the through hole, and the inner diameter of the glass tube 3 can be set in any of the following embodiments:

[0056] Embodiment five: In the embodiment five, which is not shown, the isolation step protrudes radially inward, so that the inner diameter of the through hole is smaller than any one of the inner diameter of the metal tube and the inner diameter of the glass tube. Alternatively, the isolation step protrudes radially inward, so that the inner diameter of the through hole is larger than any one of the inner diameter of the metal tube and the inner diameter of the glass tube.

[0057] Embodiment six: As shown in Figure 2 , the outlet end of the metal tube 1 extends into the plastic tube 2, and the inner wall surface of the outlet end of the metal tube 1 is axially flush with the inner wall surface of the isolation step 21; or the inlet end of the glass tube 3 extends into the plastic tube 2, and the inner wall surface of the inlet end of the glass tube 3 is axially flush with the inner wall surface of the isolation step 21.

[0058] In the embodiment six, by keeping the inner wall surface of the outlet end of the metal tube 1 axially flush with the inner wall surface of the isolation step 21 or keeping the inner wall surface of the inlet end of the glass tube 3 axially flush with the inner wall surface of the isolation step 21, the vortex caused by misalignment at the abutting position of the metal tube 1 and the plastic tube 2 or at the abutting position of the glass tube 3 and the plastic tube 2 can be avoided, thereby ensuring the smoothness of the water flow and reducing the noise during the water flow process.

[0059] In this application, the inner diameter of the metal tube 1 and the inner diameter of the glass tube 3 can be any one of the following embodiments:

[0060] Implementation Method Seven: This implementation method seven is not illustrated. In this implementation method seven, the inner diameter of the metal tube is greater than or equal to the inner diameter of the glass tube.

[0061] Implementation method eight: such as Figure 2 As shown, the inner diameter of the metal tube 1 is smaller than that of the glass tube 3. Furthermore, the outlet end of the metal tube 1 extends into the plastic tube 2, and the inlet end of the glass tube 3 abuts against the other side of the isolation step 21. The smaller inner diameter of the metal tube 1 compared to the glass tube 3 allows the water flow to naturally diffuse as it enters the glass tube 3, reducing turbulence and resistance, lowering the probability of bubble formation, optimizing the water flow path, and improving the stability of the water flow. This results in a more stable water flow at the outlet of the liquid heater, enhancing the user experience. Moreover, the smaller inner diameter of the metal tube 1 compared to the glass tube 3 creates a buffer zone when the water enters the glass tube 3, effectively buffering sudden changes in water pressure and reducing the impact of water pressure fluctuations on the sealing performance at the junction.

[0062] As a preferred embodiment of this application, such as Figure 2 and Figure 3 As shown, the plastic tube 2 has a port 22 into which the outlet end of the metal tube 1 or the inlet end of the glass tube 3 extends, and the port 22 is provided with a guide surface. By providing a guide surface in the port 22, the metal tube 1 or glass tube 3 can be easily inserted into the plastic tube 2, thereby improving the assembly efficiency of the metal tube 1 or glass tube 3 and the plastic tube 2.

[0063] In another embodiment of this application, the inner diameter of the plastic tube 2 gradually decreases from the end furthest from the isolation step 21 to the end closest to the isolation step 21. This arrangement creates a flared structure inside the plastic tube 2, making it easier to align the metal tube 1 with the plastic tube 2 or the glass tube 3 with the plastic tube 2 during installation, reducing installation difficulty and improving assembly efficiency.

[0064] Of course, more preferably, such as Figure 2 and Figure 3 As shown, the opening 22 of the plastic tube 2 is provided with a guide surface, and the inner diameter of the plastic tube 2 gradually decreases from the end away from the isolation step 21 to the end closer to the isolation step 21.

[0065] As a preferred embodiment of this application, such as Figures 1 to 3As shown, the liquid heater further comprises a light emitting member 5, the silica gel tube 4 is provided with a positioning portion 41 for mounting the light emitting member 5, the positioning portion 41 has a light guide groove 42 adapted to the light emitting member 5, the silica gel tube 4 has a sealing segment 43 sleeved outside the glass tube 3, and the light emitted by the light emitting member 5 is transmitted into the glass tube 3 through the light guide groove 42 and the sealing segment 43. The positioning portion 41 provided on the silica gel tube 4 can realize the functional integration of the silica gel tube 4. The sealing performance of the sealing segment 43 of the silica gel tube 4 can ensure the sealing between the light emitting member 5 and the glass tube 3, prevent water from seeping into the light emitting member 5, and improve the stability and reliability of the operation of the light emitting member 5. The light guide groove 42 provided on the positioning portion 41 can effectively conduct the light emitted by the light emitting member 5, reduce light loss, and improve light efficiency. Through the light guide groove 42 and the sealing segment 43, the light emitted by the light emitting member 5 can be transmitted into the glass tube 3, which not only improves the decorative effect, but also helps users quickly find the position of the liquid heater in the night or in a relatively dark environment, thereby improving the user experience. Since the glass tube 3 has the function of indicating the water level in the inner container, the light emitted by the light emitting member 5 illuminates the glass tube 3, which can help users more conveniently observe the water level in the glass tube 3. Of course, the specific function of the light emitting member 5 is not limited in this embodiment, which can be used to indicate the water temperature, water level or the current operating state of the liquid heater, for example, by different colored lights to prompt hot water or cold water.

[0066] The specific structure of the light guide groove 42 in this embodiment can adopt any one of the following embodiments:

[0067] Embodiment 3: This embodiment 3 is not shown, in this embodiment 3, the axial direction of the light guide groove is arranged perpendicular to the axial direction of the sealing segment.

[0068] Embodiment 4: As shown in the figure, Figure 2 The axial direction of the light guide groove 42 is arranged at an obtuse angle with the axial direction of the sealing segment 43. Such arrangement can make the light better diffuse in the light guide groove 42, reduce the problem of local over-brightness or over-darkness caused by direct radiation, and make the light distribution in the whole glass tube 3 more uniform. Moreover, the obtuse angle arrangement increases the reflection times of the light in the light guide groove 42, so that the light can fully utilize the length of the light guide groove 42, improve the light energy utilization rate, and ensure that more light is guided into the glass tube 3, thereby reducing light loss.

[0069] Of course, the setting position of the light emitting member 5 in this application is not limited to being arranged on the silica gel tube 4, the liquid heater further comprises a machine body, and the light emitting member 5 and the light guide structure can be arranged at a position corresponding to the glass tube 3 of the machine body to guide the light emitted by the light emitting member 5 to the glass tube 3.

[0070] As a preferred embodiment of the present application, the liquid heater further comprises a body, a water storage container and a water outlet nozzle, the metal pipe 1 is communicated with the water storage container, the glass pipe 3 is communicated with the water outlet nozzle, and the body is provided with a visible area opposite to the position of the glass pipe 3 and extending along the length direction of the glass pipe 3. By arranging the visible area opposite to the position of the glass pipe 3 and extending along the length direction of the glass pipe 3 on the body, the user can more clearly and intuitively observe the water level change in the glass pipe 3 through the visible area, and timely know the remaining water condition in the water storage container, so as to facilitate the user to add water according to the actual condition, and improve the user experience. The visible area may be a transparent glass area or a transparent plastic area such as polypropylene.

[0071] The places not described in the present application can be realized by using or referring to the existing technology.

[0072] Each of the embodiments in the present specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments mainly describes the difference from other embodiments.

[0073] The above only describes the embodiments of the present application and is not used to limit the present application. The technical features or structures in the different embodiments can be combined as needed to form other specific technical solutions. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A liquid heater comprising a metal tube, a glass tube, and an adapter assembly disposed between the metal tube and the glass tube, wherein, The adapter assembly comprises a silica gel tube and a plastic tube, the silica gel tube is sleeved outside the plastic tube, the plastic tube is provided with a radial inward protruding isolation step, the water outlet end of the metal tube and the water inlet end of the glass tube are located on opposite sides of the isolation step along the axial direction of the plastic tube, and one of the water outlet end of the metal tube and the water inlet end of the glass tube extends into the plastic tube and abuts against one side of the isolation step, and the other is located on the other side of the isolation step.

2. The liquid heater according to claim 1, wherein The isolation step continuously extends along the circumference of the inner periphery of the plastic tube to form a closed ring structure.

3. The liquid heater according to claim 1, wherein The silica gel tube has a radial inward protruding stop step abutting against the plastic tube.

4. The liquid heater according to claim 1, wherein The water outlet end of the metal tube extends into the plastic tube, and the inner wall surface of the water outlet end of the metal tube is axially flush with the inner wall surface of the isolation step; or The water inlet end of the glass tube extends into the plastic tube, and the inner wall surface of the water inlet end of the glass tube is axially flush with the inner wall surface of the isolation step.

5. The liquid heater according to claim 1, wherein The water outlet end of the metal tube extends into the plastic tube, the water inlet end of the glass tube abuts against the other side of the isolation step, and the inner diameter of the metal tube is smaller than the inner diameter of the glass tube.

6. The liquid heater according to claim 1, wherein The plastic tube has a pipe opening portion for the water outlet end of the metal tube or the water inlet end of the glass tube to extend into, and the pipe opening portion is provided with a guide surface.

7. The liquid heater according to claim 1, wherein The inner diameter of the plastic tube gradually decreases from the end away from the isolation step to the end close to the isolation step.

8. The liquid heater according to claim 1, further comprising a light emitting member, the silica gel tube is provided with a positioning portion for mounting the light emitting member, the positioning portion has a light guide groove adapted to the light emitting member, the silica gel tube has a sealing segment sleeved outside the glass tube, and the light emitted by the light emitting member passes through the light guide groove and the sealing segment and enters the glass tube.

9. The liquid heater according to claim 8, wherein The axial direction of the light guide groove and the axial direction of the sealing segment are arranged at an obtuse angle.

10. The liquid heater according to claim 1, further comprising a machine body, a water storage container and a water outlet nozzle, the metal tube communicates with the water storage container, the glass tube communicates with the water outlet nozzle, and the machine body is provided with a visible area opposite to the glass tube and extending along the length direction of the glass tube. ​ ​

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