Anti-overheating device and water heater

Abstract

The utility model relates to the technical field of household appliances, and discloses an anti-overheating device and a water heater, and the anti-overheating device comprises a water passing module which comprises a water passing cavity; the heat dissipation module comprises a heat dissipation part and a driving part, and the heat dissipation part is provided with a working position in contact with the outer wall of the water passing cavity and a non-working position out of contact with the outer wall of the water passing cavity; a phase change medium is arranged in the heat dissipation component, when the heat dissipation component is located at the working position, heat of the water passing cavity can be absorbed through phase change of the phase change medium, and the driving component drives the heat dissipation component to move between the working position and the non-working position. When the outlet water temperature is higher than the preset temperature, the driving component drives the heat dissipation component to move to the working position, so that the phase change medium in the heat dissipation component is subjected to phase change for heat exchange and cooling, the heat exchange efficiency is high, and when the outlet water temperature reaches the preset temperature, the driving component drives the heat dissipation component to move to the non-working position. And cooling of the hot water is stopped in time, and the problem that the outlet water temperature is too low is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to an overheat prevention device and a water heater. Background Art

[0002] For the existing gas water heaters, the outlet water temperature is generally set through a knob or a display panel. When affected by other factors, when it is monitored that the outlet water temperature is higher than the temperature set by the user, the water temperature cannot be adjusted in time. In particular, when the user is taking a bath, if water is used simultaneously in other places, the water flow rate into the water heater decreases. Due to the unchanged combustion condition, the outlet water temperature of the water heater will be too high, seriously affecting the user experience. To solve the above problems, some water heaters on the market introduce cold water from the inlet end and mix it with the overheated outlet water. However, the mixing situation is difficult to control, and it is easy to cause the situation of sudden cold and sudden heat, and this problem cannot be well solved. Content of the Utility Model

[0003] In view of this, the utility model provides an overheat prevention device and a water heater to solve the problem that the outlet water temperature of the existing water heater is higher than the temperature set by the user, affecting the user experience.

[0004] In the first aspect, the utility model provides an overheat prevention device, including:

[0005] A water passing module, including a water passing cavity, and the water passing cavity has a hot water inlet and a hot water outlet;

[0006] A heat dissipation module, including a heat dissipation component and a driving component, and the heat dissipation component has a working position in contact with the outer wall of the water passing cavity and a non-working position separated from the outer wall of the water passing cavity;

[0007] A phase change medium is arranged in the heat dissipation component, and when the heat dissipation component is in the working position, it can absorb the heat of the water passing cavity through the phase change of the phase change medium. The driving component is connected to the heat dissipation component to drive the heat dissipation component to move between the working position and the non-working position.

[0008] Beneficial effects: The heat of the hot water flowing through the water passage cavity will be transferred to the surface of the water passage cavity. When the outlet water temperature is higher than the preset temperature, the driving component will drive the heat dissipation component to move to the working position where it fits with the water passage cavity, causing the phase change medium in the heat dissipation component to undergo a phase change for heat exchange and cooling, and absorbing the heat on the surface of the water passage cavity through heat conduction. The heat exchange efficiency is relatively high, and it can effectively cool the hot water flowing through the water passage cavity. When this anti-overheating device is applied to a water heater, it can automatically cool the water heater when the water flow suddenly decreases and the combustion condition remains unchanged, ensuring that the outlet water temperature will not suddenly rise, thus improving the user experience. This effectively solves the problem in the prior art that for water heater products, when the water flow suddenly decreases and the combustion condition remains unchanged, the outlet water temperature of the water heater suddenly rises, affecting the user experience. In addition, in this application, when the outlet water temperature reaches the preset temperature, the driving component drives the heat dissipation component to move to the non-working position where it is disengaged from the outer wall of the water passage cavity, timely stopping the cooling of the hot water and avoiding the problem of too low outlet water temperature.

[0009] In an optional embodiment, the heat dissipation component includes a heat dissipation pipe, and the phase change medium includes a coolant disposed in the heat dissipation pipe.

[0010] Beneficial effects: The heat dissipation component adopts a heat dissipation pipe with a coolant disposed inside, which has a simple structure and good heat dissipation effect. When the heat dissipation pipe contacts the water passage cavity, heat can be conducted through the coolant, and the liquid-phase coolant turns into a gas-phase, undergoing heat exchange and cooling through phase change, with better heat exchange efficiency.

[0011] In an optional embodiment, a heat dissipation interface structure is provided on the outer wall of the water passage cavity, and the heat dissipation interface structure has an insertion channel for the heat dissipation pipe to extend into; alternatively, the outer wall of the water passage cavity is recessed inward to form an insertion channel for the heat dissipation pipe to extend into.

[0012] Beneficial effects: By providing the heat dissipation interface structure on the water passage cavity, it is convenient to dock with the heat dissipation pipe, improving the cooperation efficiency between the two. At the same time, it can also increase the contact area between the water passage cavity and the heat dissipation pipe, enabling the heat dissipation pipe and the water passage cavity to cooperate more deeply, further improving the heat dissipation effect. Alternatively, by adopting the form that the outer wall of the water passage cavity is recessed inward to form an insertion channel, the heat dissipation pipe can be inserted more deeply into the water passage cavity, so that the water on both the outer peripheral side and the central position in the water passage cavity can form a good heat dissipation effect, making the hot water in the entire water passage cavity dissipate heat more evenly and efficiently, further improving the heat dissipation effect.

[0013] In an optional embodiment, one end of the heat dissipation pipe in contact with the water passage cavity is inclined downward.

[0014] Beneficial effects: One end of the heat dissipation pipe in contact with the water passing cavity is inclined downward. By setting one end of the heat dissipation pipe in contact with the water passing cavity to be inclined downward, the coolant in the heat dissipation pipe can flow back and converge to one side close to the water passing cavity under the action of gravity, so as to efficiently absorb heat from the water passing cavity.

[0015] In an alternative embodiment, the heat dissipation component further includes:

[0016] A heat sink, one end of the heat dissipation pipe is inserted into the heat sink;

[0017] A heat dissipation fan, arranged on one side of the heat sink, for generating an air flow to dissipate heat from the heat sink and the heat dissipation pipe.

[0018] Beneficial effects: By adopting the above settings of the heat sink and the heat dissipation fan, the heat dissipation pipe is inserted into the heat sink. The setting of the heat sink can increase the heat dissipation area of the heat dissipation pipe, and by arranging the heat dissipation fan on one side of the heat sink, the heat dissipation fan can utilize the convection with the outside air to quickly dissipate the heat on the surface of the heat sink, thereby improving the condensation effect on the coolant in the heat dissipation pipe, and further effectively cooling the hot water in the water passing cavity.

[0019] In an alternative embodiment, the heat dissipation fan is fixed above the heat sink, and the heat dissipation component further includes:

[0020] A wind shield, the wind shield is arranged around the outer periphery of the heat dissipation fan.

[0021] Beneficial effects: The wind shield can make the cold air generated by the heat dissipation fan be concentrated and directed to the heat sink, effectively preventing the air flow generated by the heat dissipation fan from diffusing to the outside and affecting the heat dissipation effect of the heat sink. At the same time, the wind shield can also play a role in protecting the heat dissipation fan, reducing the risk of the heat dissipation fan being damaged by collision.

[0022] In an alternative embodiment, the heat dissipation component further includes:

[0023] A heat dissipation mounting seat, the heat sink is mounted and fixed on the heat dissipation mounting seat;

[0024] The driving component has a telescopically movable connecting seat, and the connecting seat is connected to the heat dissipation mounting seat.

[0025] Beneficial effects: The heat dissipation mounting seat facilitates the connection between the heat dissipation component and the driving component.

[0026] In an alternative embodiment, the hot water outlet is arranged on the bottom wall of the water passing cavity, and the water passing module further includes:

[0027] An outlet water temperature detection component, arranged on the bottom wall of the water passing cavity or at the hot water outlet, for detecting the outlet water temperature of the overheat prevention device.

[0028] Beneficial effects: The provided water outlet temperature detection component facilitates controlling the operation of the overheat prevention device by monitoring the water outlet temperature of the overheat prevention device, ensuring that the actual water outlet temperature can meet user requirements and avoiding the problem that too low or too high water outlet temperature affects the user experience.

[0029] In a second aspect, the present utility model further provides a water heater, including the overheat prevention device of any of the above embodiments, and the overheat prevention device is installed at the water outlet end of the water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of the water heater in the embodiment of the present utility model;

[0032] Figure 2 It is a schematic structural diagram of the overheat prevention device in the working position in the embodiment of the present utility model;

[0033] Figure 3 It is Figure 2 the front view of

[0034] Figure 4 It is Figure 2 the front view with a partial section;

[0035] Figure 5 It is a schematic structural diagram of the overheat prevention device in the non - working position in the embodiment of the present utility model;

[0036] Figure 6 It is Figure 5 the front view of

[0037] Figure 7 It is a schematic structural diagram of the heat dissipation component of the overheat prevention device in the embodiment of the present utility model;

[0038] Figure 8 It is Figure 7 the top view of

[0039] Figure 9 It is a schematic diagram of the change in the phase state of the cooling liquid in the heat dissipation pipe in the embodiment of the present utility model;

[0040] Figure 10 It is a schematic structural diagram of the driving component of the overheat prevention device in the embodiment of the present utility model;

[0041] Figure 11 Schematic diagram of the water passing module of the overheat prevention device in the embodiment of the present utility model;

[0042] Figure 12 is Figure 11 the cross-sectional view of.

[0043] Description of the reference numerals in the drawings:

[0044] 10. Overheat prevention device;

[0045] 11. Water passing module; 111. Water passing cavity; 1110. Insertion channel; 1111. Hot water inlet; 1112. Hot water outlet; 1113. Heat dissipation interface structure; 11130. Guide inclined plane; 112. Outlet water temperature detection component;

[0046] 12. Heat dissipation module;

[0047] 121. Heat dissipation component; 1211. Heat dissipation pipe; 1212. Heat dissipation fin; 1213. Heat dissipation fan; 1214. Heat dissipation mounting seat; 1215. Wind blocking piece;

[0048] 122. Driving component; 1221. Motor; 1222. Push rod; 1223. Connecting seat;

[0049] 20. Controller;

[0050] 30. Inlet water temperature detection component;

[0051] 40. Heat exchanger; 41. Inlet pipe; 42. Outlet pipe;

[0052] 50. Machine shell;

[0053] 60. Gas blower;

[0054] 70. Burner. Specific embodiments

[0055] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0056] The following will be combined with Figures 1 to 12 , to describe the embodiments of the present utility model.

[0057] According to an embodiment of the present utility model, on the one hand, the present utility model provides an overheat prevention device 10, including: a water passing module 11 and a heat dissipation module 12. The water passing module 11 includes a water passing cavity 111, and the water passing cavity 111 has a hot water inlet 1111 and a hot water outlet 1112; the heat dissipation module 12 includes a heat dissipation component 121 and a driving component 122. The heat dissipation component 121 has a working position in contact with the outer wall of the water passing cavity 111 and a non-working position separated from the outer wall of the water passing cavity 111; a phase change medium is provided in the heat dissipation component 121, and when the heat dissipation component is in the working position, heat of the water passing cavity 111 can be absorbed through the phase change of the phase change medium. The driving component 122 is connected to the heat dissipation component 121 to drive the heat dissipation component 121 to move between the working position and the non-working position.

[0058] In the above embodiment, the heat of the hot water flowing through the water passing cavity 111 is transferred to the surface of the water passing cavity 111. When the outlet water temperature is higher than the preset temperature, the driving component 122 drives the heat dissipation component 121 to move to the working position in contact with the water passing cavity 111, so that the phase change medium in the heat dissipation component 121 undergoes a phase change for heat exchange and cooling, and the heat on the surface of the water passing cavity 111 is absorbed by heat conduction. The heat exchange efficiency is relatively high, and efficient cooling of the hot water flowing through the water passing cavity 111 can be achieved. When the overheat prevention device 10 is applied to a water heater, it can automatically cool the water heater when the water flow suddenly decreases and the combustion condition remains unchanged, ensuring that the outlet water temperature will not suddenly rise, improving the user experience, and effectively solving the problem in the prior art that when the water flow of water heater products suddenly decreases and the combustion condition remains unchanged, the outlet water temperature of the water heater suddenly rises, affecting the user experience. In addition, in the present application, when the outlet water temperature reaches the preset temperature, the driving component 122 drives the heat dissipation component 121 to move to the non-working position separated from the outer wall of the water passing cavity 111, timely stopping the cooling of the hot water and avoiding the problem of too low outlet water temperature.

[0059] It should be noted that in this embodiment, the phase change medium includes but is not limited to coolant, phase change energy storage material, and inorganic phase change material, and the overheat prevention device 10 provided in this embodiment is not limited to being applied to water heaters or bathroom equipment for supplying water and steam in an electric steam generator.

[0060] Of course, the overheat prevention device 10 in this embodiment is not limited to being applied to bathroom equipment, and can also be applied to other hot water output devices, such as water purifiers, hot water machines, instant hot water dispensers, and instant hot water boilers.

[0061] As an example, the overheat prevention device 10 provided in this embodiment is applied to a water heater to solve the problem that the outlet water temperature is higher than the preset temperature due to an increase in the number of water usage points of the water heater. Specifically, the overheat prevention device 10 is installed at the outlet end of the water heater.

[0062] Further, in this embodiment, the water passing module 11 includes a hollow housing. The inner cavity of the housing forms a water passing cavity 111. The housing is made of a heat-conducting material. Preferably, the housing is made of copper, aluminum alloy or other materials with high heat conductivity, that is, the housing is a copper shell or an aluminum shell. The hot water inlet 1111 is connected to the water outlet pipe 42 of the water heater, and the hot water outlet 1112 can be directly used as the water outlet of the water heater or connected to an external water pipe.

[0063] In some embodiments, the heat dissipation component 121 includes a heat dissipation pipe 1211, and the phase change medium includes a coolant disposed in the heat dissipation pipe 1211.

[0064] In the above embodiment, the heat dissipation component 121 adopts a heat dissipation pipe 1211 with a coolant disposed inside. The structure is simple and the heat dissipation effect is good. When the heat dissipation pipe contacts the water passing cavity, heat can be conducted through the coolant, and the liquid-phase coolant becomes a gas-phase, and heat exchange and cooling are carried out through phase change, and the heat exchange efficiency is better.

[0065] Specifically, the heat dissipation pipe 1211 is a closed thin-walled container with a coolant disposed inside. The coolant is usually a low-boiling liquid such as alcohol or cooling oil. The heat dissipation pipe 1211 can be in a straight tubular shape, or can also be set as an arc-shaped or annular tubular structure matching the outer wall shape of the water passing cavity 111. In the drawings of this embodiment, the heat dissipation pipe 1211 is shown in a straight tubular form.

[0066] In some embodiments, one end of the heat dissipation pipe 1211 in contact with the water passing cavity 111 is inclined downward.

[0067] By setting one end of the heat dissipation pipe 1211 in contact with the water passing cavity 111 to be inclined downward, the coolant in the heat dissipation pipe 1211 can flow back and converge to one side close to the water passing cavity 111 under the action of gravity, so as to efficiently absorb heat from the water passing cavity 111.

[0068] Preferably, the heat dissipation pipe 1211 is arranged at an angle of 15° to 90° with the horizontal plane.

[0069] In some embodiments, a heat dissipation interface structure 1113 is provided on the outer wall of the water passing cavity 111. The heat dissipation interface structure 1113 has an insertion channel 1110 for the heat dissipation pipe 1211 to extend into, or the outer wall of the water passing cavity 111 is recessed inward to form an insertion channel 1110 for the heat dissipation pipe 1211 to extend into.

[0070] In the above embodiments, through the heat dissipation interface structure 1113 provided on the water passing cavity 111, it is convenient to dock with the heat dissipation pipe 1211, improving the cooperation efficiency between the two. At the same time, it can also increase the contact area between the water passing cavity 111 and the heat dissipation pipe 1211, enabling a deeper cooperation between the heat dissipation pipe 1211 and the water passing cavity 111, and further improving the heat dissipation effect. Or, by adopting the form that the outer wall of the water passing cavity 111 is recessed inward to form the insertion channel 1110, the heat dissipation pipe 1211 can be inserted deeper into the water passing cavity 111, so that the water on both the outer peripheral side and the central position in the water passing cavity 111 can form a good heat dissipation effect, making the hot water in the entire water passing cavity 111 dissipate heat more evenly and efficiently, and further improving the heat dissipation effect.

[0071] Specifically, the insertion channel 1110 is arranged to incline downward from the end close to the heat dissipation pipe 1211 to the end far from the heat dissipation pipe 1211, so that the heat dissipation pipe 1211 can extend obliquely downward into the insertion channel 1110. A heat dissipation interface structure 1113 is fixedly arranged on one side of the water passing cavity 111 close to the heat dissipation module 12. The heat dissipation interface structure 1113 is in the shape of a hollow cylinder, and its inner diameter matches the outer diameter of the heat dissipation pipe 1211. The heat dissipation pipe 1211 can extend along the insertion channel 1110 of the heat dissipation interface structure 1113 under the drive of the driving component 122 to a position where it abuts against the outer wall of the water passing cavity 111.

[0072] Preferably, the heat dissipation interface structure 1113 is also made of a heat-conducting material. More preferably, the heat dissipation interface structure 1113 and the water passing cavity 111 are integrally formed.

[0073] More preferably, a guiding inclined surface 11130 is arranged on the inner circumference of the end of the heat dissipation interface structure 1113 far from the water passing cavity 111. By arranging the guiding inclined surface 11130, it can play a guiding role, facilitating the insertion of the heat dissipation pipe 1211 and improving the docking efficiency between the two. Specifically, the guiding inclined surface 11130 is annular, and the end of the heat dissipation interface structure 1113 forms an outwardly expanding guiding channel, and the inner diameter of the guiding channel gradually narrows from the end far from the water passing cavity 111 to the end close to the water passing cavity 111. The guiding inclined surface 11130 can be formed by chamfering.

[0074] Or, in other alternative embodiments, an outwardly expanding guiding portion in the shape of a frustum of a cone can also be arranged at the end of the heat dissipation interface structure 1113 far from the water passing cavity 111.

[0075] It should be noted that in this embodiment, taking the method of forming the insertion channel 1110 on the water passing cavity 111 to realize the contact and cooperation between the heat dissipation tube 1211 and the water passing cavity 111 as an example, of course, in other alternative embodiments, the contact and cooperation between the heat dissipation tube 1211 and the water passing cavity 111 can be realized by the form that the heat dissipation tube 1211 surrounds the outer wall of the water passing cavity 111.

[0076] In some embodiments, the heat dissipation component 121 further includes: heat dissipation fins 1212 and a heat dissipation fan 1213. One end of the heat dissipation tube 1211 is inserted into the heat dissipation fins 1212, and the other end can be inserted into the insertion channel 1110; the heat dissipation fan 1213 is arranged on one side of the heat dissipation fins 1212 and is used to generate an air flow to dissipate heat from the heat dissipation fins 1212 and the heat dissipation tube 1211.

[0077] In the above embodiment, by adopting the arrangement of the heat dissipation fins 1212 and the heat dissipation fan 1213, the heat dissipation tube 1211 is inserted into the heat dissipation fins 1212. The arrangement of the heat dissipation fins 1212 can increase the heat dissipation area of the heat dissipation tube 1211, and through the heat dissipation fan 1213 arranged on one side of the heat dissipation fins 1212, the heat dissipation fan 1213 can utilize the convection with the outside air to quickly dissipate the heat on the surface of the heat dissipation fins 1212, thereby improving the condensation effect on the coolant in the heat dissipation tube 1211, and further effectively cooling the hot water in the water passing cavity 111.

[0078] Specifically, in this embodiment, there are a plurality of heat dissipation fins 1212 arranged in sequence. Insertion holes for the ends of the heat dissipation tubes 1211 to be inserted are formed in the plurality of heat dissipation fins 1212, and the heat dissipation tubes 1211 horizontally penetrate through the plurality of heat dissipation fins 1212.

[0079] Optionally, the heat dissipation tube 1211 is press-fitted into the insertion holes of the heat dissipation fins 1212; or, an anti-disengagement structure is provided at the end of the heat dissipation tube 1211, and the anti-disengagement structure is engaged with the heat dissipation fins 1212 to prevent the heat dissipation tube 1211 from disengaging from the heat dissipation fins 1212; or, the heat dissipation tube 1211 is fixedly welded to the heat dissipation fins 1212.

[0080] Optionally, the heat dissipation fan 1213 is fixed above the heat sink 1212. Preferably, the heat dissipation component further includes a wind shield 1215, which is fixed above the heat sink 1212. The wind shield 1215 is an annular member that surrounds the outer periphery of the heat dissipation fan 1213. By providing the wind shield 1215, the cold air generated by the heat dissipation fan 1213 can be concentrated and directed towards the heat sink 1212, effectively preventing the airflow generated by the heat dissipation fan 1213 from diffusing to the outside and affecting the heat dissipation effect of the heat sink 1212. At the same time, the wind shield 1215 can also protect the heat dissipation fan 1213 and reduce the risk of the heat dissipation fan 1213 being damaged by bumps.

[0081] More preferably, the wind shield 1215 is an annular wind baffle, and the shape and size of the annular wind baffle match the shape and size of the largest transverse cross-section of the heat sink 1212. A wind guiding channel is formed in the middle of the wind shield 1215, and the wind guiding channel communicates the heat dissipation fan 1213 and the heat sink 1212. The heat dissipation fan 1213 includes a connecting shaft at the center and fan blades arranged on the outer periphery of the connecting shaft. The connecting shaft is connected and fixed to the heat sink 1212, and the height of the wind shield 1215 is not less than the height of the fan blades.

[0082] Optionally, there are multiple heat dissipation tubes 1211, and multiple insertion channels 1110 are correspondingly formed on the water passing cavity 111.

[0083] Preferably, there are two heat dissipation tubes 1211, and the two heat dissipation tubes 1211 are arranged at intervals. Correspondingly, two insertion channels 1110 are arranged at intervals on the water passing cavity 111.

[0084] In some embodiments, the heat dissipation component 121 further includes a heat dissipation mounting seat 1214. The heat sink 1212 is installed and fixed on the heat dissipation mounting seat 1214. The driving component 122 has a telescopic and movable connecting seat, and the connecting seat is connected to the heat dissipation mounting seat 1214. By providing the heat dissipation mounting seat 1214, it is convenient to connect the heat dissipation component 121 and the driving component 122.

[0085] Specifically, the heat dissipation mounting seat 1214 includes a side plate and a bottom plate arranged in an L shape. The heat sink 1212 is fixed on the bottom plate of the heat dissipation mounting seat 1214. The side plate is located on the side of the bottom plate close to the water passing cavity 111, and a through hole for the heat dissipation tube 1211 to pass through is provided on the side plate. The driving component 122 includes a motor 1221, a push rod 1222, and a connecting seat 1223 connected to the end of the push rod 1222.

[0086] Further, the motor 1221 is a linear motion motor. Mounting holes are provided on the body of the motor 1221, and it can be mounted on the water heater body by means of threaded connection or the like, so as to fix the motor 1221 to the water heater. A push rod 1222 is provided on the motor 1221, and a connection seat 1223 is provided on the push rod 1222 by screw connection or welding. The connection seat 1223 is fixedly connected to the heat dissipation mounting seat 1214. The push rod 1222, the connection seat 1223, etc. are not fixedly connected to the water heater body and can perform linear motion inside the water heater. Heat dissipation fins 1212 and a heat dissipation pipe 1211 are provided on the heat dissipation mounting seat 1214. The heat dissipation fins 1212 are fixed to the heat dissipation mounting seat 1214 by welding. Insertion holes are provided on the heat dissipation fins 1212 for the heat dissipation pipe 1211 to pass through. The heat dissipation pipe 1211 and the heat dissipation fins 1212 can be fixed by interference fit or welding. A heat dissipation fan 1213 is provided at the top of the heat dissipation fins 1212. The heat dissipation fan 1213 can be fixed to the heat dissipation fins 1212 by threaded connection or welding to dissipate heat from the heat dissipation fins 1212 and the heat dissipation pipe 1211.

[0087] In some embodiments, the water passing module 11 further includes an outlet water temperature detection component 112, which is disposed on the bottom wall of the water passing cavity 111 or at the hot water outlet 1112 for detecting the outlet water temperature of the overheat prevention device 10.

[0088] In the above embodiments, by providing the outlet water temperature detection component 112, it is convenient to control the operation of the overheat prevention device 10 by monitoring the outlet water temperature of the overheat prevention device 10, so as to ensure that the actual outlet water temperature can meet the user's needs and avoid the problem that the outlet water temperature is too low or too high, which affects the user experience.

[0089] Specifically, the outlet water temperature detection component 112 is an embedded temperature sensor, and the outlet water temperature detection component 112 has a temperature sensing end. In one example, an installation opening is provided on the bottom wall of the water passing cavity 111, and the temperature sensing end of the outlet water temperature detection component 112 extends into the water passing cavity 111 through the installation opening to detect the outlet water temperature. In another example, the hot water outlet 1112 is an interface structure, and an installation opening is provided on the side wall of the interface structure. The temperature sensing end of the outlet water temperature detection component 112 extends into the interface structure from the installation opening on the side wall of the interface structure to detect the outlet water temperature.

[0090] Optionally, the outlet water temperature detection component 112 is fixed to the water passing cavity 111 by threaded connection or welding.

[0091] In some embodiments, the hot water outlet 1112 is provided at the bottom of the water passing cavity 111, and the hot water inlet 1111 is provided at the top of the water passing cavity 111. Hot water enters from the hot water inlet 1111 at the top of the water passing cavity 111 and flows out from the hot water outlet 1112 at the bottom of the water passing cavity 111 under the action of gravity.

[0092] Preferably, the hot water inlet 1111 and the hot water outlet 1112 are arranged offset in the vertical direction. With such a design, the water flow will not directly flow out. After the hot water enters the water passing cavity 111, it can stay in the water passing cavity 111 for a certain period of time to ensure sufficient heat dissipation and cooling time, thereby improving the cooling effect on the hot water.

[0093] More preferably, the hot water inlet 1111 and the hot water outlet 1112 are respectively arranged on the top wall and the bottom wall of the water passing cavity 111. The hot water inlet 1111 and the hot water outlet 1112 are respectively configured as an inlet interface structure and an outlet interface structure to facilitate docking with external pipelines.

[0094] Even more preferably, the lower end of the outlet interface structure is exposed outside the water passing cavity 111, and the upper end of the outlet interface structure extends into the water passing cavity 111 and is higher than the lowest position of the water passing cavity 111. With such a design, it can be ensured that the hot water will not directly flow out after entering the water passing cavity 111, but will flow out only after the water level in the water passing cavity 111 reaches a certain height, thereby ensuring sufficient heat dissipation and cooling time and avoiding the problem of poor cooling effect due to too short residence time of the hot water.

[0095] In this embodiment, when the outlet water temperature is higher than the preset temperature, the overheat prevention device 10 is activated, the motor 1221 operates, and the control push rod 1222 is controlled to push the heat dissipation component 121, so that the heat dissipation pipe 1211 extends into the heat dissipation interface structure 1113, making the heat dissipation pipe 1211 contact with the heat dissipation interface structure 1113 and the outer wall of the water passing cavity 111, and the heat dissipation fan 1213 operates. Combined Figures 2 to 4 、 Figure 9 As shown, the low-boiling coolant inside the heat dissipation pipe 1211 absorbs the heat in the water passing cavity 111 and vaporizes. The vaporized coolant flows to the side of the heat dissipation pipe 1211 close to the heat dissipation fins 1212 through transpiration, and the coolant is condensed and releases heat under the action of the heat dissipation fan 1213 and the heat dissipation fins 1212. The condensed coolant flows back to the side of the heat dissipation pipe 1211 close to the water passing cavity 111 under the action of gravity, and then cools down the hot water in the water passing cavity 111.

[0096] According to an embodiment of the present invention, on the other hand, a water heater is provided, including the overheat prevention device 10 of any of the above embodiments, and the overheat prevention device 10 is installed at the water outlet end of the water heater.

[0097] Specifically, the water passing module 11 of the overheat prevention device 10 is installed on the water outlet pipe 42 of the water heater, and the heat dissipation module 12 of the overheat prevention device 10 is installed on the body of the water heater. Exactly, the driving component 122 is fixed on the body of the water heater, and the heat dissipation component 121 can be movably connected to the body of the water heater.

[0098] The water heater provided by this embodiment further includes a casing 50, a controller 20, a heat exchanger 40, a gas blower 60, a burner 70, and a water inlet temperature detection component 30. Among them, the heat exchanger 40 is arranged inside the casing 50, and the heat exchanger 40 is respectively connected with a water inlet pipe 41 and a water outlet pipe 42; the burner 70 is arranged below the heat exchanger 40, the gas blower 60 is arranged above the burner 70, and the water inlet temperature detection component 30 is arranged on the water inlet pipe 41 for detecting the water inlet temperature.

[0099] The working process of the water heater is as follows:

[0100] When the user sets a preset water outlet temperature and turns on the water heater for hot water use. The gas blower 60 in the water heater system rotates, gas enters the burner 70, and at the same time, tap water enters the tube side of the heat exchanger 40 from the water inlet pipe 41. The burner 70 heats the tap water. During this process, the water inlet temperature detection component 30 obtains and sends the water inlet temperature in real time. The controller 20 controls the gas proportional valve according to the water inlet temperature and the preset water outlet temperature to adjust the gas ratio entering the burner 70. The hot water and the tap water exchange heat in the heat exchanger 40 and then flow into the anti-overheat device 10. When the water outlet temperature detection component 112 detects that the water outlet temperature of the water heater is higher than the preset water outlet temperature, the anti-overheat device 10 is started.

[0101] According to an embodiment of the present invention, on the other hand, a control method applied to the above-mentioned water heater is provided. The control method includes the following steps:

[0102] Step S101: Control the water heater to start;

[0103] Step S102: Obtain the preset water outlet temperature T1 set by the user and the actual water outlet temperature T2 of the water heater;

[0104] Step S103: When it is determined that the difference between the actual water outlet temperature T2 and the preset water outlet temperature T1 satisfies the preset anti-overheat device start condition, control the anti-overheat device 10 to start.

[0105] In the above embodiment, after the water heater is started, the actual water outlet temperature T2 of the water heater is monitored in real time, and when it is determined that the difference between the actual water outlet temperature T2 and the preset water outlet temperature T1 satisfies the preset anti-overheat device start condition, the anti-overheat device 10 is controlled to start, which can effectively reduce the water temperature flowing through the water passing cavity 111, avoid the water outlet temperature of the water heater from being too high, improve the user experience, and effectively solve the problem that when the existing water heater users take a bath and if other places use water at the same time, due to the unchanged combustion condition, the water outlet temperature of the water heater will be too high, seriously affecting the user experience.

[0106] In some embodiments, the preset anti-overheat device start condition includes:

[0107] The difference between the actual outlet water temperature T2 and the preset outlet water temperature T1 is greater than the set first temperature difference threshold △T1, where △T1 is between 1°C and 1.5°C.

[0108] In the above embodiment, when it is determined that T2 - T1 > △T1, the motor 1221 is controlled to act to insert the heat dissipation pipe 1211 into the insertion channel 1110 of the water passing cavity 111, and at the same time, the heat dissipation fan 1213 is controlled to start to efficiently dissipate heat from the water passing cavity 111, reduce the water temperature of the hot water flowing through the water passing cavity 111, ensure that the outlet water temperature does not suddenly rise, and improve the user experience.

[0109] In some more preferred embodiments, the preset starting conditions of the overheat prevention device further include:

[0110] When it is detected that the difference between the actual outlet water temperature T2 and the preset outlet water temperature T1 is greater than the set first temperature difference threshold △T1, and the duration of T2 - T1 > △T1 is greater than the set duration t0.

[0111] In the above embodiment, when it is determined that the difference between the actual outlet water temperature and the preset outlet water temperature is greater than the first temperature difference threshold and the duration is greater than the set duration, the overheat prevention device 10 is controlled to start, avoiding the problem that the outlet water temperature of the water heater fluctuates briefly during use, and this fluctuation does not affect the user experience, but frequently opening and closing the overheat prevention device 10 affects its service life.

[0112] In some embodiments, after the overheat prevention device 10 is started, the following steps are further executed:

[0113] Step S201: Continuously monitor the actual outlet water temperature T2;

[0114] Step S202: When it is determined that the difference between the actual outlet water temperature T2 and the preset outlet water temperature T1 is less than or equal to the second temperature difference threshold △T2, control the overheat prevention device 10 to close, where △T2 < △T1.

[0115] In the above embodiment, after the overheat prevention device 10 is started, if it is detected that T2 - T1 < △T2, the heat dissipation module 12 in the overheat prevention device 10 is controlled not to work, and the hot water flows out normally. The overheat prevention device 10 will be started only when the difference between T2 and T1 rises to △T1, and the overheat prevention device 10 will be closed only when the difference between T2 and T1 drops to △T2. There is a certain difference between △T2 and △T1, which can provide a buffer between the opening and closing of the overheat prevention device 10, avoiding the problem that the hot water temperature of the water heater frequently fluctuates slightly during use, and the overheat prevention device 10 frequently opens and closes, affecting the user experience.

[0116] Preferably, △T2 is between 0.1°C and 0.5°C.

[0117] In some embodiments, after the overheat prevention device 10 is started, if it is determined that the difference between the actual outlet water temperature T2 and the preset outlet water temperature T1 is between △T2 and △T1, the overheat prevention device 10 is controlled not to be turned off, and normal operation is controlled or the rotation speed of the cooling fan 1213 is reduced.

[0118] In some embodiments, controlling the start of the overheat prevention device 10 specifically includes the following steps:

[0119] Step S301: Control the driving component 122 to act to insert the heat dissipation pipe 1211 into the insertion channel 1110 of the water passing cavity 111, and at the same time control the cooling fan 1213 to start;

[0120] Step S303: By controlling the rotation speed of the cooling fan 1213, the actual outlet water temperature of the water heater is maintained at T2 = T1 + (△T1 + △T2) / 2.

[0121] In the above embodiments, by controlling the rotation speed of the cooling fan 1213, the outlet water temperature is controlled at T2 = T1 + (△T1 + △T2) / 2, so that the hot water temperature is in the buffer zone, and the phenomenon of overheating of the outlet water temperature is avoided.

[0122] It should be explained that by controlling the actual outlet water temperature of the water heater at T1 + (△T1 + △T2) / 2 in this embodiment, the actual outlet water temperature may be slightly on the high side, but the value that is higher is set within a reasonable range and will not cause obvious discomfort to the user.

[0123] The working principle of the water heater and the overheat prevention device 10 in this embodiment will be introduced below with reference to the accompanying drawings.

[0124] In this embodiment, when the overheat prevention device 10 works, the push rod 1222 of the motor 1221 extends, so that the heat dissipation pipe 1211 contacts the outside of the water passing cavity 111, and the cooling fan 1213 rotates; when the overheat prevention device 10 does not work, the push rod 1222 of the motor 1221 retracts, the cooling fan 1213 stops rotating, and the heat dissipation pipe 1211 does not contact the water passing cavity 111.

[0125] When hot water flows into the overheat prevention device 10, the water heater detects the actual outlet water temperature, and the measured value of the actual outlet water temperature is T2. The water heater detects whether the temperature of T2 - T1 is greater than the second temperature difference threshold △T2, and △T2 is the temperature threshold for turning off the overheat prevention device 10, usually taking 0.1 - 0.5 °C. When the temperature rise of the hot water does not exceed △T2, the heat dissipation part in the overheat prevention device 10 does not work, and the hot water flows out normally.

[0126] When the user is taking a bath and water is being used elsewhere, the water flow rate changes, and the detected hot water temperature T2 - T1 > ΔT2. The hot water temperature is detected again to check if the hot water outlet temperature T2 - T1 is greater than the first temperature difference threshold ΔT1. ΔT1 is the temperature threshold for controlling the start of the anti-overheating device 10, usually taken as 1 - 1.5 °C. When the temperature rise is higher than ΔT1, the anti-overheating device 10 of the water heater starts.

[0127] When the anti-overheating device 10 starts, the motor 1221 operates to push the push rod 1222, causing the heat dissipation tube 1211 to contact the heat dissipation interface structure 1113, and the heat dissipation fan 1213 operates. The low-boiling liquid inside the heat dissipation tube 1211 absorbs the heat in the water passing cavity 111 and vaporizes. The vaporized coolant flows to the side of the heat dissipation tube 1211 inserted into the heat sink 1212 through transpiration. Under the action of the heat dissipation fan 1213 and the heat sink 1212, the coolant is condensed and releases heat. The condensed coolant flows back to the side of the heat dissipation interface structure 1113 of the heat dissipation tube 1211 close to the water passing cavity 111 under the action of gravity. The rotation speed and rotation frequency of the heat dissipation fan 1213 are controlled by the controller 20 to control the outlet water temperature at T2 = T1 + (ΔT1 + ΔT2) / 2, so as to control the outlet water temperature without overheating.

[0128] When the water flow rate returns to normal, if it is determined that T2 - T1 ≤ ΔT2, the motor 1221 controls the push rod 1222 to retract, and the heat dissipation module 12 in the anti-overheating device 10 does not operate. In this way, it can be avoided that when the user is taking a bath and water is used elsewhere at the same time, the water temperature will not suddenly rise, resulting in a bad experience for the user.

[0129] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the protection scope of the embodiments of the present application.

Claims

1. An overheating prevention device, characterized in that: include: A water flow module (11) comprises a water flow chamber (111), wherein the water flow chamber (111) has a hot water inlet (1111) and a hot water outlet (1112); A heat dissipation module (12) comprising a heat dissipation component (121) and a driving component (122), wherein the heat dissipation component (121) has a working position in contact with the outer wall of the water passage chamber (111) and a non-working position out of contact with the outer wall of the water passage chamber (111); A phase change medium is provided in the heat dissipation component (121), and when the heat dissipation component (121) is in the working position, the heat of the water passage chamber (111) can be absorbed by phase change of the phase change medium. The driving component (122) is connected to the heat dissipation component (121) to drive the heat dissipation component (121) to move between the working position and the non-working position.

2. The overheating prevention device according to claim 1, characterized in that: The heat dissipation component (121) comprises a heat dissipation pipe (1211), and the phase change medium comprises a cooling liquid arranged in the heat dissipation pipe (1211).

3. The overheating prevention device according to claim 2, characterized in that: A heat dissipation interface structure (1113) is provided on the outer wall of the water passage chamber (111), and a plug-in channel (1110) is provided in the heat dissipation interface structure (1113) for the heat dissipation pipe (1211) to extend into.

4. The overheating prevention device according to claim 2, characterized in that: The outer wall of the water passage cavity (111) is recessed inwardly to form a plug-in channel (1110) into which the heat dissipation pipe (1211) can extend.

5. The overheating prevention device according to claim 2, characterized in that: The end of the heat dissipation pipe (1211) that contacts the water passage chamber (111) is inclined downward.

6. The overheating prevention device according to any one of claims 2 to 5, characterized in that: The heat dissipation component (121) further comprises: A heat sink (1212), one end of the heat sink pipe (1211) being plugged into the heat sink (1212); A heat dissipation fan (1213) is arranged on one side of the heat dissipation fin (1212) and is used to generate airflow to dissipate heat from the heat dissipation fin (1212) and the heat dissipation pipe (1211).

7. The overheating prevention device according to claim 6, characterized in that: The heat dissipation fan (1213) is fixed above the heat dissipation fin (1212), and the heat dissipation component (121) further comprises: A wind shield (1215), wherein the wind shield (1215) is arranged around the outer periphery of the heat dissipation fan (1213).

8. The overheating prevention device according to claim 6, characterized in that: The heat dissipation component (121) further includes: A heat dissipation mounting seat (1214), the heat sink (1212) being mounted and fixed on the heat dissipation mounting seat (1214); The driving component (122) has a telescopically movable connecting seat (1223), and the connecting seat (1223) is connected to a heat dissipation mounting seat (1214).

9. The overheating prevention device according to any one of claims 1 to 5, characterized in that: The hot water outlet (1112) is arranged on the bottom wall of the water passage chamber (111), and the water passage module (11) further comprises: The water outlet temperature detection component (112) is arranged on the bottom wall of the water passage chamber (111) or at the hot water outlet (1112) and is used to detect the water outlet temperature of the overheating prevention device (10).

10. A water heater, characterized in that: It comprises the overheating prevention device (10) according to any one of claims 1 to 9, and the overheating prevention device (10) is installed at the water outlet of the water heater.

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