Steam humidifier and control method

Abstract

The present invention belongs to the technical field of humidifiers, and in particular to a steam humidifier and a control method, comprising a shell, an inner liner, a heating component and a control circuit. The shell is provided with a cavity, and a support portion is provided in the cavity or at the upper end of the shell. The inner liner is provided in the cavity of the shell and supported on the support portion. The support portion may be at the bottom of the cavity, in which case the bottom end of the inner liner is supported on the support portion, or the support portion may be at the top edge of the shell or at the upper end of the cavity, in which case the mouth of the inner liner extends outward with an extension portion that is mutually limited by the support portion, thereby achieving fixed installation of the inner liner in the cavity of the shell. The inner liner comprises a cavity with an air vent at the upper end and a bottom cover sealed at the bottom of the cavity. The heating component is attached to the bottom wall of the bottom cover. The control circuit is provided in the shell and is electrically connected to the heating component for controlling the on and off of the heating component.

Description

Technical Field

[0001] The present invention belongs to the technical field of household appliances, and in particular relates to a steam humidifier and a control method thereof. Background Art

[0002] A humidifier is a household appliance that increases the humidity in a room. It can be used to humidify a specific room or connected to a boiler or central air conditioning system to humidify an entire building. Humidifiers are primarily categorized by their operating principle: ultrasonic humidifiers and steam humidifiers.

[0003] Ultrasonic humidifiers use high-frequency ultrasonic oscillations at a frequency of 1.7 MHz to atomize water into ultrafine particles 1-5 microns in size, refreshing the air, promoting health, and creating a comfortable environment. The advantages of ultrasonic humidifiers include strong, uniform, and efficient humidification; energy-saving and power-saving, consuming only 1 / 10 to 1 / 15 of that of electric humidifiers; long service life, automatic humidity balance, and automatic water-depletion protection; and they can also be used for medical atomization, cold compress baths, and jewelry cleaning.

[0004] Thermal evaporative humidifiers, also known as electric humidifiers, operate by heating water to 100°C in a heating element, generating steam that is then blown out by a fan. Therefore, electric humidifiers are the simplest humidification method in terms of both technology and structure.

[0005] A steam humidifier heats water to boiling, which produces steam. Therefore, the water in the humidifier will become less and less. Since the humidifier is in a static state, it is usually not noticed after the water is boiled dry, especially when sleeping at night, it is even more difficult to detect; therefore, it will cause the dry burning phenomenon. Summary of the Invention

[0006] The object of the present invention is to provide a steam humidifier and a control method thereof, so as to solve the problem that current electric steam heaters are prone to dry burning.

[0007] To achieve the above-mentioned object, an embodiment of the present invention provides a steam humidifier, comprising:

[0008] The shell is provided with a cavity, and a support portion is provided in the cavity or at the upper end of the shell;

[0009] The inner liner is arranged in the cavity and supported on the support portion, and the inner liner includes a cavity with a vent at the upper end and a bottom cover sealed at the bottom of the cavity;

[0010] A heating component is attached to the bottom wall of the bottom cover to heat the water in the cavity; and

[0011] A control circuit is disposed in the housing and electrically connected to the heating component for controlling the on and off of the heating component;

[0012] The bottom wall of the bottom cover is provided with a heating area and a non-heating area. The heating component is attached to the heating area. The non-heating area is attached with a temperature sensor and is electrically connected to the control circuit. The temperature sensor is used to detect the temperature change of the non-heating area, so that the control circuit will sound an alarm or control the heating component to cut off power.

[0013] Furthermore, the shell includes a base and an outer cover, the base is arranged at the bottom end of the outer cover, the control circuit is arranged in the base, and the inner shell is arranged in the outer cover.

[0014] Furthermore, the base includes a bottom wall, side walls and a top wall that form an installation cavity, and the control circuit is arranged in the installation cavity; the top wall is recessed downward to form an insulation cavity, and the bottom of the inner tank extends into the insulation cavity.

[0015] Furthermore, an annular slot is provided at the top of the base, and the bottom end of the outer cover is clamped in the slot.

[0016] The cam is secured to the upper edge of the support frame, and the cam has a first end secured to the lower edge of the support frame, the second end secured to the lower edge of the support frame, and the second end secured to the lower edge of the support frame. The inner side of the support ring is inserted into the top of the limit ring, and a tapered portion is extended outward and downward at an angle. The bottom end of the tapered portion is provided with a pressure ring that extends into the card slot to press the bottom end of the outer cover in the card slot. A closed sound insulation cavity is formed between the tapered portion and the top wall; a step portion is extended inward from the bottom end of the vertical side wall, a third connecting column is extended from the bottom of the step portion, and a bottom ring is extended downward from the inner edge of the step portion; the limit seat includes a bottom plate, and a support wall abutting the support ring is extended upward from the edge of the bottom plate, and a sealing ring is extended upward from the top of the bottom plate, and the sealing ring abuts the bottom ring; the locking screw passes through the bottom plate and is connected to the third connecting column; the seat body, the support seat and the limit seat form an installation cavity.

[0017] Furthermore, the bottom cover is a glass-ceramic plate.

[0018] Furthermore, the temperature sensor is an NTC thin film sensor.

[0019] Furthermore, a limit member is provided at the bottom of the cavity for limiting the NTC film sensor from being attached to the bottom wall of the bottom cover; the limit member includes a fixing seat and a silicone rod, the fixing seat is provided at the bottom of the cavity, the silicone rod is fixed on the fixing seat, and the silicone rod supports the NTC film sensor on the bottom wall of the bottom cover.

[0020] Furthermore, a capacitive spring water detection device is provided at the bottom of the cavity to detect whether there is water in the inner tank.

[0021] Furthermore, two thermostats and a fuse in contact with the bottom cover are provided at the bottom of the cavity. The two thermostats are relatively arranged on both sides of the heating component. The two thermostats, the fuse and the heating component are connected in series.

[0022] Furthermore, the heating component includes a graphene heating film and an insulation pad. The graphene heating film is attached to the bottom of the bottom cover, and the insulation pad completely covers the graphene heating film, so that the graphene heating film is located between the insulation pad and the bottom cover; an insulation space is also provided between the insulation pad and the bottom wall of the cavity.

[0023] Furthermore, the top wall of the bottom cover is a smooth surface, and the bottom wall of the bottom cover is a frosted surface.

[0024] The above one or more technical solutions in the steam humidifier provided by the embodiment of the present invention have at least the following technical effects:

[0025] When water is added to the humidifier, the control circuit powers on the heating element, heating the water to a boil. The boiling water forms steam and escapes through the vents, increasing the humidity of the air. When the water in the humidifier dries up or nearly dries up, the temperature of the non-heating area changes significantly. A temperature sensor quickly detects this temperature change, confirming that the water in the humidifier is dry or nearly dry. The control circuit then powers off the heating element, effectively preventing dry boiling and protecting the humidifier.

[0026] A control method for a steam humidifier is used to control a steam humidifier; a heating component heats water in an inner tank, and a temperature sensor detects that the temperature of a bottom cover remains constant, and then a control circuit controls the heating power of the heating component to be reduced to 30% to 60% of the rated power.

[0027] Furthermore, after the heating component keeps the water in the inner pot boiling, the temperature sensor detects that the temperature of the non-heating area of ​​the bottom cover changes rapidly, and the control circuit controls the heating component to cut off power.

[0028] The above one or more technical solutions in the control method provided by the embodiment of the present invention have at least the following technical effects:

[0029] 1. The heating element heats the water in the inner tank. Before the water boils, the temperature sensor can detect that the water temperature in the inner tank will continue to rise. When the detected water temperature remains unchanged for a certain period of time, it can be recognized that the water has boiled. Therefore, the control circuit controls the current or voltage of the heating element to reduce, thereby reducing the heating power of the heating element, so that the water in the inner tank is in a slightly boiling state. This not only ensures the generation of steam, but also reduces the sound of the water boiling and reduces noise. It also allows the humidifier to quickly boil the water. After boiling, it can enter a low-power heating state, saving energy and preventing the problem of the water in the inner tank from drying up quickly.

[0030] 2. When the water in the inner tank is in a boiling state, the water temperature remains unchanged. When the temperature sensor suddenly detects a change in the temperature of the bottom cover of the inner tank, it can be judged that the water in the inner tank is close to being dried up or has been dried up. The heating component can be controlled to cut off the power and stop heating, thereby achieving a good protection for the humidifier as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a structural diagram of a steam humidifier provided in an embodiment of the present invention.

[0033] Figure 2 This is a structural diagram of another embodiment of the steam humidifier provided by an embodiment of the present invention.

[0034] Figure 3 This is a diagram of the internal structure of a steam humidifier provided in an embodiment of the present invention.

[0035] Figure 4 for Figure 3 sectional view of .

[0036] Figure 5 for Figure 3 A partial enlarged view of .

[0037] Figure 6 This is a structural diagram of the base of the steam humidifier provided in an embodiment of the present invention.

[0038] Figure 7 This is an exploded view of the base of the steam humidifier provided in an embodiment of the present invention.

[0039] Figure 8A cross-sectional view of the base of a steam humidifier provided in an embodiment of the present invention.

[0040] Figure 9 for Figure 7 A partial enlarged view of .

[0041] Figure 10 This is an exploded view of the inner tank portion of the steam humidifier provided in an embodiment of the present invention.

[0042] Figure 11 A cross-sectional view of a top cover of a steam humidifier provided in an embodiment of the present invention.

[0043] Figure 12 for Figure 11 A partial enlarged view of .

[0044] Figure 13 An exploded view of a locking member of a steam humidifier provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0046] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0048] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0049] In one embodiment of the present invention, the steam humidifier provided in this embodiment refers to Figures 1 to 4 what Figure 10 , which includes an outer shell 100, an inner liner 200, a heating component 300 and a control circuit 400. Specifically, the outer shell 100 is provided with a cavity, and a support portion is provided in the cavity or at the upper end of the outer shell 100. The inner liner 200 is arranged in the cavity of the outer shell 100 and supported on the support portion. Specifically, the support portion can be at the bottom of the cavity, and the bottom end of the inner liner 200 is supported on the support portion, or the support portion can be at the top edge of the outer shell 100 or the upper end of the cavity, and the mouth of the inner liner 200 extends outward with an extension portion that is mutually limited by the support portion, thereby achieving the inner liner 200 being fixedly installed in the cavity of the outer shell 100. The inner liner 200 includes a cavity 201 with an air vent at the upper end and a bottom cover 210 sealed at the bottom of the cavity 201. The heating component 300 is attached to the bottom wall of the bottom cover 210 to heat the water in the cavity 201. The control circuit 400 is arranged in the housing 100 and is electrically connected to the heating component 300 for controlling the power on and off of the heating component 300. The control circuit includes a circuit board and an integrated circuit, as well as an alarm device. More specifically, the bottom wall of the bottom cover 210 is provided with a heating area and a non-heating area, the heating component 300 is attached to the heating area, and the non-heating area is attached with a temperature sensor 500 and electrically connected to the control circuit 400. The temperature sensor 500 is used to detect changes in the temperature of the non-heating area, so that the alarm device in the control circuit 400 sounds an alarm, which is convenient for the user to turn off the power, or the control circuit 400 directly controls the heating component 300 to cut off the power, thereby protecting the entire humidifier.

[0050] The humidifier operates as follows: water is added to the cavity 201 of the inner liner 200, and the control circuit 400 controls the heating element 300 to energize and heat the water in the inner liner 200 until it boils. The boiling water forms water vapor and escapes through the vents, thereby increasing the humidity in the air. When the water in the inner liner 200 boils dry or nearly dry, the temperature of the non-heating zone changes significantly. Whether the temperature in the non-heating zone increases or decreases depends on the material of the bottom cover 210. If the bottom cover 210 is made of metal, the temperature will increase. If it is made of inorganic non-metallic materials such as glass or microcrystalline silicon glass, the detected temperature will decrease. The temperature sensor 500 can quickly detect the temperature change in the non-heating zone, thereby determining whether the water in the inner liner 200 has boiled dry or nearly dry. Therefore, the control circuit 400 can control the heating element 300 to shut off power, effectively preventing the dry-out phenomenon and protecting the humidifier.

[0051] Furthermore, a control method for the steam humidifier of this embodiment may be: heating the water in the inner tank 200 via the heating assembly 300. When the temperature sensor 500 detects that the temperature of the bottom cover 210 remains constant, it can be determined that the water in the inner tank 200 has been heated to boiling. Therefore, the heating power of the heating assembly 300 can be controlled by the control circuit 400 to be reduced to 30% to 60% of the rated power, preferably to 50% to 55% of the rated power, thereby causing the water in the inner tank 200 to be in a slightly boiling state. This not only ensures the generation of steam but also reduces the sound of the boiling water, thereby reducing noise. This humidifier can quickly boil water and then enter a low-power heating state after boiling, saving electricity and also preventing the problem of the water in the inner tank 200 quickly drying up. In addition, in this solution, the temperature sensor 500 is used to detect the change in the water temperature in the inner tank 200 to determine whether the water is boiling, rather than directly detecting the water temperature to determine the boiling of the water. This avoids the problem that the boiling of water is different at different atmospheric pressures, and it is impossible to determine whether the water is boiling by temperature, and thus the heating component 300 cannot be automatically controlled to adjust the heating power.

[0052] Furthermore, after the heating assembly 300 keeps the water in the inner tank 200 boiling, the temperature sensor 500 detects a rapid change in the temperature of the non-heating area of ​​the bottom cover 210, and the control circuit 400 controls the heating assembly 300 to be powered off. This can determine that the water in the inner tank 200 is close to being boiled dry or has already been boiled dry, and the heating assembly 300 can be controlled to be powered off and stop heating, thereby effectively protecting the humidifier as a whole.

[0053] For further information, please refer to Figures 1 to 4The housing 100 includes a base 120 and an outer cover 110. The base 120 is disposed at the bottom of the outer cover 110, the control circuit 400 is disposed within the base 120, and the inner container 200 is located within the outer cover 110. This isolates the inner container 200 from the control circuit 400, preventing heat from the heating element 300 from being transferred to the control circuit 400, thereby providing good thermal insulation and protection for the control circuit 400. Furthermore, an annular groove 1202 is provided at the top of the base 120, and the bottom end of the outer cover 110 is retained within the groove 1202.

[0054] Further, please refer to Figures 4 to 10 The base 120 includes a bottom wall, side walls and a top wall that enclose an installation cavity 1200, and the control circuit 400 is arranged in the installation cavity 1200. The top wall is recessed downward to form an insulation cavity 1201, and the bottom of the inner tank 200 extends into the insulation cavity 1201. In this embodiment, the heating component 300 is completely located in the insulation cavity 1201, which can achieve a good insulation effect, prevent excessive heat from being transferred into the installation cavity 1200, and also prevent heat from being transferred to the outer wall of the base 120, thereby effectively preventing the base 120 from being overheated and scalding the user. Furthermore, after the heating component 300 is attached to the bottom side of the bottom cover 210, a piece of insulation pad 310 is used to completely cover the heating component 300 to achieve an insulation effect, prevent the heat generated by the heating component 300 from being transferred downward, and enable the heating component 300 to concentrate heating on the bottom cover 210; this not only improves the thermal efficiency, but also prevents the base 120 from being overheated. In addition, the heat insulation pad 310 is made of silicon dioxide. A more preferred embodiment of the heating component 300 is that the heating portion of the heating component 300 is a graphene heating film, which has high heating efficiency and a large heating coverage area.

[0055] Further, refer to Figures 4 to 9The base 120 includes a base body 121, a support base 122, a limiting ring 123, and a limiting base 124. A first supporting ring 1210 extends upward from the periphery of the base body 121, and a first connecting column 1211 extends upward from the top wall. A limiting groove is provided on the top of the first supporting ring 1210 (not shown in the drawings). A second supporting ring 1220 extends downward from the periphery of the support base 122, and a second connecting column corresponding to the first connecting column 1211 extends from the bottom. A clamping portion is provided at the bottom of the second supporting ring 1220 to engage with the limiting groove. A locking screw passes through the first connecting column 1211 from the bottom of the base body 121 and is connected to the second connecting column. A top ring 1222 extends inward from the upper end of the support base 122. The top ring 1222 has an inner ring. A supporting ring 1223 extends downward from the inner ring of the top ring 1222. The clamping groove 1202 is provided on the top wall of the top ring 1222. The retaining ring 123 includes a vertical sidewall 1230 that extends into the inner side of the support ring 1223. A tapered portion 1231 extends outward and downward from the top of the retaining ring 123. The bottom end of the tapered portion 1231 is provided with a pressure ring 1232 that extends into the slot 1202 to press the bottom end of the outer cover into the slot 1202. The tapered portion 1231 and the top wall of the support base 122 define a closed soundproofing chamber 125, which provides excellent sound insulation. Therefore, when the water in the inner liner 200 boils, it can achieve a good quieting effect. A stepped portion 1233 extends inward from the bottom end of the vertical sidewall 1230. A third connecting column 1234 extends from the bottom of the stepped portion 1233. A bottom ring 1235 extends downward from the inner edge of the stepped portion 1233. The limiting seat 124 includes a bottom plate 1240. The edge of the bottom plate 1240 extends upward to form a support wall 1241 that abuts against the support ring 1223. A sealing ring 1242 extends upward from the top of the bottom plate 1240, and the sealing ring 1242 abuts against the bottom ring 1235. The locking screw passes through the bottom plate 1240 and is connected to the third connecting column 1234. The base 121, the support seat 122 and the limiting seat 124 form an installation cavity 1200. The base 120 structure of this embodiment can be formed into a multi-circle structure, which not only has a good heat insulation effect, but also can reduce the noise generated by boiling water.

[0056] For further information, please refer to Figure 6 what Figure 7 The vertical sidewall 1230 is also provided with a plurality of U-shaped grooves 1236, forming a plurality of elastic walls 1237 on the vertical sidewall 1230. The inner side of the elastic wall 1237 is also provided with a resisting portion for elastically gripping the lower end of the inner liner 200, thereby elastically limiting the position of the inner liner 200. Furthermore, after the base 120 is assembled, the structure of the support seat 122 effectively limits the position of the elastic wall 1237, preventing the elastic wall 1237 from rebounding. This allows the resisting portion to effectively limit the position of the inner liner 200 and prevent it from loosening.

[0057] Furthermore, the bottom cover 210 is a microcrystalline glass plate. The microcrystalline glass plate has characteristics such as high temperature resistance. More importantly, when the microcrystalline glass plate is used as the bottom cover 210, the temperature difference between the heating area and the non-heating area will be very large. Specifically, according to the characteristics of microcrystalline glass, the temperature of the non-heat source part changes greatly. When there is less water, the temperature of the non-heating part changes relatively greatly, thereby judging whether the water in the inner pot 200 is close to being boiled dry. More specifically, after the water in the inner pot is almost dried up, the temperature of the non-heating area of ​​the bottom cover 210 will be in a declining state for a period of time. The temperature sensor 500 detects that the temperature of the bottom cover 210 drops during this period, and then the water level in the inner pot 200 can be judged. As for the phenomenon of the temperature drop in the non-heating area of ​​the bottom cover 210, it is obtained through multiple tests and inspections. You can refer to the test data recorded in the following icon. This test data intercepts the data when the heating component 300 just starts to heat up, as well as the test data when the water in the inner pot 200 is close to being boiled dry.

[0058]

[0059] From the above test data, it can be seen that when the water is close to drying up, the temperature detected by the temperature sensor decreases. The water level in the last set of data is that only a water mass remains in the central 2 / 3 part of the cavity 201.

[0060] In addition, since the temperature of the non-heating area of ​​the bottom cover 210 is decreasing, it can effectively protect the temperature sensor 500 and prevent the temperature sensor 500 from being damaged by overheating. Furthermore, the bottom cover 210 is made of silicone and connected to the inner container 200 as an integral structure.

[0061] Furthermore, the top wall of the bottom cover 210 is a smooth surface, while the bottom wall of the bottom cover 210 is a frosted surface. The surface in contact with water is changed from a conventional grained surface to a smooth surface, which reduces the height difference of the surface in contact with water, reduces the area for generating bubbles, and thus reduces the noise.

[0062] Furthermore, the temperature sensor 500 is an NTC thin film sensor, which has higher detection sensitivity and high detection accuracy, effectively avoiding the phenomenon of misjudgment.

[0063] Further, refer to Figure 6 what Figure 7To better secure the temperature sensor 500 against the bottom of the bottom cover 210, a limiting member 600 is provided at the bottom of the cavity to prevent the NTC thin film sensor from being attached to the bottom wall of the bottom cover 210. The limiting member 600 includes a fixing base 610 and a silicone rod 620. The fixing base 610 is provided at the bottom of the cavity, specifically at the bottom of the thermal insulation cavity 1201 of the base 120. The silicone rod 620 is fixed to the fixing base 610, and the silicone rod 610 supports the NTC thin film sensor against the bottom wall of the bottom cover 210.

[0064] Further, refer to Figure 6 and Figure 7 A capacitive spring water detection device is also provided at the bottom of the insulating cavity 1201 of the base 120 to detect whether there is water in the inner pot 200. In this embodiment, after water is added to the inner pot, the capacitive spring water detection device 700 can detect the water. When there is water in the inner pot 200, the capacitive spring water detection device 700 can detect the potential difference. If there is no water, the potential difference cannot be detected, which can further prevent dry boiling. The capacitive spring water detection device 700 is a capacitive touch switch. Its operating principle and structure are related to the prior art and are therefore not described in detail in this embodiment.

[0065] Furthermore, the bottom of the cavity is also provided with two thermostats 220 and a fuse 230 in contact with the bottom cover 210. Figure 7 Thermostat 220 and fuse 230 are mounted on the bottom wall of the insulating cavity 1201 of the base 120. The two thermostats 220 are positioned on opposite sides of the heating assembly 300. The two thermostats 220, fuse 230, and heating assembly 300 are connected in series. Therefore, the two thermostats 220 can monitor the temperature of the bottom cover 210. If the temperature is too high, the thermostats 220 can disconnect, cutting off the power supply. The addition of fuse 230 provides further protection.

[0066] Furthermore, to facilitate cleaning of the inner liner 200, the top of the cavity 201 of the inner liner 200 in this embodiment is open, making it very convenient to clean residual scale and other debris inside the inner liner 200. To prevent contact or foreign matter from falling into the inner liner 200, the steam humidifier of this embodiment also includes a top cover 800, which is used to cover the opening of the cavity 201 of the inner liner 200. The top cover 800 is provided with multiple steam vents, through which steam can be discharged.

[0067] Further, refer to Figure 11 and Figure 5The top cover 800 includes a connecting cover 810, a fixed cover 820, a movable cover 830 and a locking member 840. The inner liner 200 and the outer shell 100 form an insulating cavity 101, and the upper end of the insulating cavity 101 is formed with an annular opening. The connecting cover 810 is fixedly connected to the opening of the insulating cavity 101. The fixed cover 820 is arranged on the connecting cover 810. The fixed cover 820 has an installation opening 821 connected to the inner liner 200. The inner side wall of the installation opening 821 is provided with an installation groove 822. A mounting portion 831 pivotally connected to the installation groove 822 extends from one side of the movable cover 830. The locking member 840 is arranged on the fixed cover 820 or the connecting cover 810, and can lock the movable cover 830 to seal the installation opening 821; the steam vent is arranged on the movable cover 830. In this embodiment, the inner container 200 is covered by a movable cover 830. When water needs to be added, the movable cover 830 can be loosened by the locking member 840, thereby opening the movable cover 830 and adding water to and cleaning the inner container 200. To facilitate the opening of the movable cover 830, a torsion spring can be installed on the rotating shaft connecting the mounting portion 831 and the mounting groove 822, so that the movable cover 830 can be automatically opened by the torsion spring.

[0068] Further, refer to Figure 11The movable cover 830 includes an upper air outlet cover 832, a lower air outlet cover 833, an insulating cover 834, and a waterproof ring 835. The lower air outlet cover 833 includes a side ring 8330. A connecting ring 8331 extends inward from the lower end of the side ring 8330. A support ring 8332 extends upward from the inner end of the connecting ring 8331. A steam channel 8333, with a basin-like structure, extends obliquely downward from the upper end of the support ring 8332. The insulating cover 834 is sealed against the bottom end of the steam channel 8333 and is also provided with multiple through-holes that communicate with the steam channel 8333. The bottom of the side ring 8330 is provided with an annular groove 8335; a waterproof ring 835 is located within the annular groove 8335. The waterproof ring 835 is provided with a sealing groove. The edge of the thermal insulation cover 834 is bent upward and snapped into the sealing groove, providing a waterproof effect. Water vapor can only enter the steam channel 8333 through the through hole, and then be released into the air through the steam channel 8333. Multiple fourth connecting posts 8336 extend upward from the connecting ring 83331. The air outlet cover 832 covers the opening of the side ring 8330. Fifth connecting posts 8320 extend downward from the top of the air outlet cover 832, corresponding to the fourth connecting posts 8336. Locking screws pass through the fourth connecting posts 8336 to connect to the fifth connecting posts 8320. The air outlet cover 832 is provided with multiple air holes 8321. In this embodiment, water vapor generated by the inner liner 200 enters the steam channel 8333 through the through-holes and is then discharged into the air through the air holes 8321. This increases the steam flow path, lowering the temperature of the water vapor and preventing the discharged water from being too hot and potentially scalding human skin. It also effectively provides thermal insulation, effectively preventing the area around the top cover 800 from overheating. Furthermore, the structure of this top cover 800 also provides excellent sound-absorbing properties, reducing the noise of boiling water.

[0069] For further information, please refer to Figure 12 A water trough 8334 is also provided at the top of the support ring 8332. A sealing ring 8323 extends downward from the bottom of the air outlet cover 832 and extends into the water trough 8334. In this embodiment, the generated water vapor condenses into water and collects in the water trough 8334. This forms a dense structure with the sealing ring 8323, preventing the steam from being discharged only through the air holes 8321, further enhancing the thermal insulation effect.

[0070] Furthermore, the top of the air outlet cover 832 is recessed with a groove 8322, which sinks into the steam channel 8333. The sidewall of the groove 8322 is provided with a plurality of air holes 8321. In this embodiment, the boiling sound of water can be better reduced and the temperature of the water vapor can be further reduced.

[0071] Further, refer to Figure 13The locking member 840 includes a knob 841, a swinging member 842, a lock catch 843, a first spring 844, a second spring 849, and a stopper 845. A second mounting cavity 811 is provided at the top of the connecting cover 810, with a gap 812 provided on the outside for evacuation. The gap 812 and the second mounting cavity 811 form a front sidewall 813, and the second mounting cavity 811 and the inner sidewall of the connecting cover 810 form a rear sidewall 814. The front sidewall 813 is provided with a rotatable connection portion 846 facing the gap 812. The knob 841 is rotatably connected to the rotatable connection portion 846. The lower end of the front sidewall 813 is provided with a evacuation position 815 that communicates with the second mounting cavity 811. A cam surface 847 is provided on the inner side of the knob 841, extending through the evacuation position 815 and into the second mounting cavity 811. The swinging member 842 is rotatably mounted within the second mounting cavity 811, with its lower end abutting against the cam surface 847. A slide slot 816 is provided at the upper end of the rear sidewall 814. A latch 843 is slidably disposed within the second mounting cavity 811. A snap-fit ​​portion extends from one side of the latch 843 and slides through the slide slot 816. A retaining slot is provided on one side of the movable cover 830. A first spring 844 is disposed between the front sidewall 813 and the latch 843, configured to push the retaining portion out of the slide slot 816 and engage with the retaining slot of the movable cover 830. A toggle portion 848 is provided at the upper end of the swing member 842, configured to abut against the latch 843. A retaining seat 845 is disposed at the mouth of the second mounting cavity 811, configured to retain the latch 843 and first spring 844 within the second mounting cavity 811. A screw hole is provided in the rotating connection portion 846, and a limited through-hole is provided in the knob 841. A locking screw slides through the limited through-hole and connects to the screw hole. The head of the locking screw is retained outside the through-hole, preventing the knob 841 from separating from the connection cover 810. A second spring 849 is sleeved on the locking screw, with one end abutting the knob and the other end abutting the rotating connection portion 846. Therefore, after the locking member 840 of this embodiment has locked the movable cover 830, the knob 841 can be rotated, causing the cam surface 847 on the inner side of the knob 841 to be offset from the clearance position 815. The cam surface 847 is limited by the front side wall 813, so that pressing the knob 841 will not open the locking member 840. Furthermore, even if the knob 841 is rotated so that the cam surface 847 is located at the avoidance position 815, the movable cover 830 cannot be opened. Instead, the knob 841 needs to be pressed again to cause the cam surface 847 to squeeze the swinging member so that the lock 843 can open the movable cover, effectively preventing the top cover 800 from being opened by a child.

[0072] Furthermore, refer to Figure 5The connecting cover 810 includes a lower cover 8101 and a top cover 8102. The mouth of the inner liner 200 extends outward to form a stepped opening structure 202. The lower cover 8101 is arranged between the outer shell 100 and the inner liner 200, and the outer wall of the stepped opening abuts the inner side edge of the lower cover 8101. The lower cover 8101 has a first side wall 8105 extending upward near the inner side wall, and a second side wall 8103 extending upward from the outer side wall. The two side walls of the top cover 8102 extend downward to form a third side wall 8104 and a fourth side wall 8107. The third side wall 8104 abuts the upper end of the first side wall 8105, and the fourth side wall 8107 is sleeved on the outer side of the second side wall 8103 to form an annular cavity 8108. A sealing portion 8106 also extends upward from the inner side of the top cover 8102, and the sealing portion 8106 overlaps the top edge of the inner liner 200. The connecting cover 810 structure of this embodiment can effectively fix the inner liner 200 and also provide good heat insulation effect.

[0073] In addition, in order to facilitate carrying, a handle is provided on the fixed cover 820, and the handle can be rotated and stored in the concave cavity on the top surface of the fixed cover 820, so as to be flush with the fixed cover 820.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A steam humidifier, characterized in that: The steam humidifier comprises: The housing is provided with a cavity, and a support portion is provided in the cavity or at the upper end of the housing; An inner liner is disposed in the cavity and supported on the support portion, the inner liner comprising a cavity with a vent at the upper end and a bottom cover sealed at the bottom of the cavity; a heating component attached to the bottom wall of the bottom cover to heat the water in the cavity; and a control circuit disposed in the housing and electrically connected to the heating component to control the on and off of the heating component; The bottom wall of the bottom cover is provided with a heating area and a non-heating area, the heating component is attached to the heating area, the non-heating area is attached with a temperature sensor and is electrically connected to the control circuit, the temperature sensor is used to detect the change of the temperature of the non-heating area, so as to make the control circuit issue an alarm or control the heating component to be powered off; The bottom cover is a glass-ceramic plate; the temperature sensor is an NTC thin film sensor; a limiter is further provided at the bottom of the cavity for limiting the position of the NTC thin film sensor against the bottom wall of the bottom cover; the limiter includes a fixing seat and a silicone rod; the fixing seat is provided at the bottom of the cavity; the silicone rod is fixed to the fixing seat; and the silicone rod supports the NTC thin film sensor on the bottom wall of the bottom cover; When the water is nearly boiled dry, the temperature of the non-heating area of ​​the bottom cover decreases, and the temperature detected by the temperature sensor also decreases.

2. The steam humidifier according to claim 1, characterized in that: The housing includes a base and an outer cover, the base is arranged at the bottom end of the outer cover, the control circuit is arranged in the base, and the inner container is arranged in the outer cover; The base includes a bottom wall, side walls and a top wall that form an installation cavity, and the control circuit is arranged in the installation cavity; the top wall is recessed downward to form a heat insulation cavity, and the bottom of the inner tank extends into the heat insulation cavity.

3. The steam humidifier according to claim 2, characterized in that: The cam is secured to a position 50 metres high and has a top, pivotal portion for securing the cam and a bottom, and the cam is secured to a position 56 metres high and a bottom, respectively. The top of the limiting ring is provided with a tapered portion extending downward and obliquely outward, and the bottom end of the tapered portion is provided with a pressure ring extending into the slot for pressing the bottom end of the outer cover in the slot, and a closed soundproof cavity is formed between the tapered portion and the top wall; the bottom end of the vertical side wall is provided with a step portion extending inward, and a third connecting column is extended from the bottom of the step portion, and a bottom ring is extended downward from the inner edge of the step portion; the limiting seat includes a bottom plate, and a support wall abutting against the support ring is extended upward from the edge of the bottom plate, and a sealing ring is extended upward from the top of the bottom plate, and the sealing ring abuts against the bottom ring; a locking screw passes through the bottom plate and is connected to the third connecting column; the seat body, the support seat and the limiting seat form the installation cavity.

4. The steam humidifier according to any one of claims 1 to 3, characterized in that: A capacitive spring water detection device is also provided at the bottom of the cavity to detect whether there is water in the inner container.

5. The steam humidifier according to any one of claims 1 to 3, characterized in that: The bottom of the cavity is also provided with two thermostats and a fuse in contact with the bottom cover. The two thermostats are arranged on both sides of the heating component opposite to each other. The two thermostats, the fuse and the heating component are connected in series.

6. The steam humidifier according to any one of claims 1 to 3, characterized in that: The heating component includes a graphene heating film and a thermal insulation pad. The graphene heating film is attached to the bottom of the bottom cover, and the thermal insulation pad completely covers the graphene heating film, so that the graphene heating film is located between the thermal insulation pad and the bottom cover; an insulating space is also provided between the thermal insulation pad and the bottom wall of the cavity.

7. The steam humidifier according to any one of claims 1 to 3, characterized in that: The top wall of the bottom cover is a smooth surface, and the bottom wall of the bottom cover is a frosted surface.

8. A method for controlling a steam humidifier, characterized in that: Used to control the steam humidifier according to any one of claims 1 to 7; the heating component heats the water in the inner tank, and the temperature sensor detects that the temperature of the bottom cover remains unchanged, then the control circuit controls the heating power of the heating component to be reduced to 30% to 60% of the rated power.

9. The control method of the steam humidifier according to claim 8, characterized in that: After the heating component keeps the water in the inner pot boiling, the temperature sensor detects that the temperature of the non-heating area of ​​the bottom cover changes rapidly, and then the control circuit controls the heating component to cut off power.

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