CN210601819U

CN210601819U - Liquid heater and range hood

Info

Publication number: CN210601819U
Application number: CN201921625173.7U
Authority: CN
Inventors: 王宏宇; 刘新; 李星; 黎本锋
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-05-22
Anticipated expiration: 2029-09-26

Abstract

The utility model discloses a liquid heater and range hood, wherein, liquid heater includes: the heating body is provided with a heating cavity, and a water inlet communicated with the heating cavity and a discharge port for discharging steam are formed in the heating body; a heating element mounted within the heating chamber; and the nozzle is arranged corresponding to the discharge port and used for spraying steam out of the nozzle. The utility model discloses technical scheme is favorable to improving liquid heater's cleaning performance.

Description

Liquid heater and range hood

Technical Field

The utility model relates to a range hood technical field, in particular to liquid heater and range hood.

Background

Along with the improvement of living standard of people, self-cleaning devices utilizing steam for cleaning gradually appear in the range hood. The existing steam generator has the defects that the steam pressure sprayed to the cleaning position is low and the range hood is not easy to clean due to the fact that the position where steam is generated is far away from the cleaning position or a long steam conveying pipeline is used.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a liquid heater, which aims to improve the cleaning effect of the liquid heater.

In order to achieve the above object, the present invention provides a liquid heater, including:

the heating body is provided with a heating cavity, and a water inlet communicated with the heating cavity and a discharge port for discharging steam and/or hot water are formed in the heating body;

a heating element mounted within the heating chamber;

and the nozzle is arranged corresponding to the discharge port, so that steam and/or hot water can be sprayed out of the nozzle.

In the technical scheme of the utility model, when needing to produce steam and/or hot water and wash, pour into the washing liquid into the heating chamber through the water inlet, the washing liquid is under the high temperature effect of heat-generating body and heating member, become high-temperature high-pressure gaseous state and/or hot water state by the liquid state, high-temperature steam and/or hot water that produce directly pass through the nozzle and spray to waiting to wash the position, so, with the great shortening of the distance between steam generation position and the steam service position, make high-temperature high-pressure steam can fast and accurate reach and take the washing position, be favorable to improving the pressure that steam flows to waiting to wash the position, speed and temperature, thereby be favorable to improving the cleaning performance; in addition, the liquid heater structure in this application is very succinct, and the miniaturization of being convenient for is favorable to installing liquid heater to being close to the position of treating the washing for liquid heater's use flexibility very.

Optionally, the liquid heater further comprises a second sealing gasket, and the second sealing gasket is sleeved on the nozzle. To improve the sealing performance at the nozzle. Meanwhile, the direct contact between the volute and the heating body made of the conductive material can be avoided, the phenomenon of electric leakage or circuit break is avoided, and the use safety of the liquid heater is improved.

Optionally, the second sealing gasket comprises a compression part, the compression part has elasticity and is sleeved on the nozzle, and the compression part is arranged between the heating element and the side wall which is enclosed to form the region to be cleaned so as to seal the gap between the heating element and the side wall which is enclosed to form the region to be cleaned. The tightness between the liquid heater and the side wall enclosing the area to be cleaned can be further improved.

Optionally, the second gasket further comprises a blocking portion, the blocking portion is fixedly connected with the compression portion, the blocking portion wraps the outer side wall of the nozzle, and the nozzle and the blocking portion penetrate through air inlet holes formed in the side wall of the area to be cleaned.

Optionally, a compression groove is formed on a peripheral side wall of the compression part. The peripheral side wall of the compression part is provided with a compression groove. When the compression part is extruded by external force, the compression part is easier to deform and generates larger deformation, and the gap between the heating body and the volute can be better filled under the action of elastic restoring force, so that the further sealing effect is achieved. Meanwhile, due to the arrangement of the compression groove, the material consumption of the second sealing gasket can be reduced, and the material is saved.

Alternatively, the nozzle is provided in a columnar shape, and the nozzle has an exhaust hole penetrating in a length direction thereof, the exhaust hole communicating the discharge port and the outside of the liquid heater.

Alternatively, the nozzle and the heat generating body are integrally cast.

Optionally, the nozzle includes a base body segment and an introduction segment connected to the base body segment, the base body segment is embedded on the heating body, the length of the base body segment is equivalent to the thickness of the side wall of the heating body, and the introduction segment is used for extending into an area to be cleaned.

Optionally, an installation opening communicated with the heating chamber is formed in the end portion of the heating body, the liquid heater further comprises an end cover and a first sealing gasket, and the end cover is arranged corresponding to the installation opening; the first sealing gasket is arranged between the end cover and the mounting opening. So as to be convenient for maintaining and cleaning the heating cavity and simultaneously ensure that the sealing cover is arranged at the mounting opening under the working state.

Optionally, a through opening is formed in one side of the heating element, and the live wire and zero wire joints of the heating element are exposed out of the heating element through the through opening. So that the heating element is connected with the power supply and the circuit is simplified.

Optionally, the live wire and neutral wire joints of the heating element and the heating element are integrally cast. The installation process of the heating element is simplified, and meanwhile, the sealing performance of the heating element and the heating body is improved.

Optionally, the heating element is arranged in a U-shape, and the two free ends of the heating element extend away from the plane of the U-shape. The heating efficiency of heating member is improved, the power supply line connection of heating member is convenient for simultaneously.

Optionally, the liquid heater further comprises a temperature controller, the temperature controller is arranged on the outer side wall of the heating element, a lead connected with the heating element is electrically connected with the temperature controller, and the temperature controller is connected with a power supply. So as to improve the safety of the heating element.

Optionally, the number of temperature controllers is two, the live wire and the zero line joint of heating member are connected with different temperature controllers electricity through the wire respectively. The use of the heating element is doubly protected.

Optionally, the heating body has the installation face, the live wire and the zero line joint of heating member expose in the installation face, the temperature controller corresponds the live wire and the zero line joint of heating member set up in the installation face.

Optionally, the liquid heater further comprises an insulating cover and a protective cover, and the protective cover is sleeved outside the insulating cover;

the protective cover is connected with the heating element so that the insulating cover and the heating element are enclosed to form a space for accommodating the temperature controller. Protect the temperature controller and improve the use stability of the temperature controller.

Optionally, an avoiding notch is formed in the side wall of the protective cover, an installation boss is arranged on the insulating cover corresponding to the avoiding notch, and a wire passing hole for a wire connected with the temperature controller to pass through is formed in the installation boss. Improve the wiring leakproofness and the convenience of temperature controller power cord.

Optionally, the electrode plate of the temperature controller is arranged close to the wire through hole. So as to simplify the power supply wiring of the temperature controller.

Optionally, the side wall of the insulating cover is further provided with a clamping gap, one end of the clamping gap is communicated with the wire passing hole, and the other end of the clamping gap extends to the edge of the insulating cover to be communicated with the outside. The convenience of power cord installation is improved, the convenience of temperature controller installation is improved.

Optionally, the liquid heater still includes temperature sensor, on the lateral wall of heat-generating body, the corner that corresponds the heating member is provided with the fixed orifices, temperature sensor pass through the fixed orifices with the corner of heating member corresponds the setting. The maximum temperature of the heating element is detected, so that the safety of the use of the heating element is ensured while the work of the heating element is controlled conveniently.

The utility model discloses a range hood is further provided, include:

the volute is internally provided with a wind wheel;

the liquid heater is arranged on the volute, and a nozzle of the liquid heater extends into the volute;

the liquid heater includes:

the heating body is provided with a heating cavity, and a water inlet communicated with the heating cavity and a discharge port for discharging steam are formed in the heating body;

a heating element mounted within the heating chamber;

and the nozzle is arranged corresponding to the discharge port and used for spraying steam out of the nozzle.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of the range hood of the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of the blower of FIG. 1;

FIG. 3 is a schematic diagram of an embodiment of the volute of FIG. 2;

FIG. 4 is a schematic structural view of another embodiment of the fan of FIG. 1;

FIG. 5 is a schematic view of the structure of FIG. 4 under another condition;

FIG. 6 is a schematic diagram of an embodiment of the blower volute of FIG. 4;

fig. 7 is a schematic structural view of an embodiment of the liquid heater of the range hood of the present invention;

FIG. 8 is a schematic structural view of the liquid heater of FIG. 7 with the protective cover opened;

FIG. 9 is a schematic view of the structure of FIG. 7 at another angle;

fig. 10 is a schematic flow chart of an embodiment of a control method of the range hood of the present invention;

fig. 11 is an exploded view of an embodiment of the liquid heater of the present invention;

FIG. 12 is an enlarged view of the structure at A in FIG. 11;

fig. 13 is a schematic view of the internal structure of the liquid heater according to an embodiment of the present invention;

fig. 14 is a schematic view of the internal structure of another embodiment of the liquid heater according to the present invention after installation;

fig. 15 is a schematic structural view of the liquid heater of the present invention mounted on the volute;

fig. 16 is an enlarged schematic view of B in fig. 15.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Casing (CN)	200	Fan blower
210	Spiral casing	211	Air inlet
				212	Air outlet	213	Air intake
300	Liquid heater	310	Heating body
				311	Mounting port	312	First gasket
313	End cap	315	Nozzle with a nozzle body
				320	Water inlet pipe	330	Protective cover
340	Mounting bracket	341	Convex lug
				350	Heating element	360	Temperature controller
318	Injection hole	370	Second gasket
				316	Heating cavity	361	Pole piece
380	Insulating cover	381	Mounting boss
				382	Wire through hole	383	Clamping gap
390	Temperature sensor	220	Impeller
				371	Plugging part	372	Compression part
315a	Base body segment	315b	Lead-in section
				373	Compression groove

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model mainly provides a range hood to increase range hood's automatically cleaning ability.

The specific structure of the range hood will be mainly described below.

Referring to fig. 1 to 9, in the embodiment of the present invention, the range hood includes:

the fan 200 comprises a volute 210 and an impeller 220 arranged in the volute 210, and a plurality of air inlet holes 213 are formed in the side wall of the volute 210;

and a liquid heater 300, the liquid heater 300 having a plurality of injection holes provided corresponding to the intake holes 213 such that the injection holes communicate with the inside of the scroll 210.

Specifically, in the present embodiment, the impeller 220 may be an axial flow impeller 220, or may be a through flow or centrifugal impeller 220, taking the centrifugal impeller 220 as an example. Under the operation of the impeller 220, the flue gas enters the volute 210 from the axial direction of the impeller 220 and exits the volute 210 from the tangential direction of the volute 210. The liquid heater 300 changes the cleaning liquid into vapor, and under the action of the water pump and the phase change (the liquid state is changed into the gas state, the volume is increased, and the pressure is increased), the vapor is sprayed out from the spraying hole of the liquid heater 300 and enters the interior of the volute 210 through the air inlet hole 213.

Wherein the liquid heater 300 includes: the heating body 310 is provided with a cavity, and the cavity is provided with a water inlet and a steam outlet; a heating member connected to the heating body 310 to heat the heating body 310; an injection hole provided corresponding to the steam injection port. The heating member may have many forms, and for example, the heating tube 350 is disposed outside the heating body 310, and when the heating tube 350 is energized, the temperature of the heating body 310 is increased. When the temperature rises to a certain temperature, the cleaning liquid is fed into the container of the heating element 310, and the cleaning liquid is rapidly changed into steam under the action of high temperature and is sprayed out from the water spray holes 318 under the action of pressure. The liquid heater 300 has a complete steam generating structure and is very compact, so that the self-cleaning piping is very compact.

In order to more clearly show the compactness of the liquid heater 300, the specific structure of the liquid heater 300 will be described below.

The heating element 310 is a flat box, and a water inlet pipe 320 is disposed on a side surface (the side surface of the heating element opposite to the scroll 210) with a larger area, so that the cleaning liquid can enter the cavity of the heating element 310. The heating member is exemplified by a heating tube 350, the heating tube 350 is disposed in the cavity of the heating body 310, and both electrodes of the heating member and the water inlet tube 320 are disposed on the same side of the heating body 310 so as to be connected to a power source. In order to conveniently acquire the current temperature of the heating element 310, an even temperature sensor and a temperature controller 360 are further provided on the heating element 310. In order to protect the electrode of the heating tube 350, the temperature controller 360, and the like, a protective cover 330 is further disposed on the heating element 310, and the protective cover 330 and the heating element 310 enclose to form a containing cavity to contain and protect the electrode of the heating tube 350 and the temperature controller 360.

A plurality of injection holes are opened at one side of the heating element facing the scroll 210, and a nozzle is provided at the position of the injection holes to ensure that the mist sufficiently enters the scroll 210. Among them, the water spray holes 318 are arranged along the longitudinal direction of the heating element 310. Meanwhile, the second sealing gasket 370 is sleeved on the nozzle, so that the steam is prevented from leaking from the nozzle and the jet hole, and the steam is prevented from leaking from the jet hole and the air inlet hole of the volute. When the liquid heater 300 is assembled, the second gasket 370 is pressed against the surface of the scroll 210, and its elastic deformation ensures that the steam does not leak from the inlet hole 213 of the scroll 210. It should be noted that the second sealing gasket 370 also has a heat insulation function, so as to isolate the high temperature of the heating element 310 from the volute 210, and prevent the high temperature of the heating element 310 from being transmitted to the volute 210, thereby protecting the volute 210 and improving the utilization of energy by the heating element 310.

In order to ensure the installation stability of the liquid heater 300, it further includes a mounting bracket 340, and the mounting bracket 340 is engaged with a side of the heat-generating body 310 facing the scroll 210. The mounting bracket 340 includes a mounting portion engaged with the heating body 310 and a fastening portion engaged with the scroll 210, the fastening portion includes a lug 341 extending outward from the mounting portion, and the lug 341 is provided with a fastening hole. The mounting bracket 340 is fixedly coupled to the scroll 210 through fastening holes and fasteners.

A plurality of air inlet holes 213 are formed on the sidewall of the scroll 210, and a plurality of spray holes of the liquid heater 300 are respectively communicated with the air inlet holes 213, so that mist sprayed from the water spray holes 318 enters the interior of the scroll 210 through the air inlet holes 213 to clean the impeller 220 and the scroll 210.

In this embodiment, the plurality of air inlet holes 213 are formed on the sidewall of the scroll 210, the plurality of injection holes are formed on the liquid heater 300, and the injection holes are arranged corresponding to the air inlet holes 213, so that the steam generated by the liquid heater 300 can be injected into the scroll 210 from a plurality of positions, thereby increasing the area covered by the steam injection and the injection angle, and improving the cleaning effect of cleaning the impeller 220 and the scroll 210.

In some embodiments, in order to improve the stability of the steam injection, the opening of the injection hole is parallel to the horizontal direction so that the steam is injected in the horizontal direction. The air inlet hole 213 of the volute 210 is arranged corresponding to the impeller 220, and the opening of the spraying hole is parallel to the horizontal direction, so that the steam sprayed from the liquid heater 300 can be horizontally sprayed out, the surface covered by the steam sprayed out from the plurality of water spraying holes 318 is large enough, the impeller 220 can be in the range covered by the steam spraying along the axial area, the impeller 220 can be ensured to be cleaned by the steam, and the cleaning range is also increased to improve the cleaning effect. In addition, the horizontal spraying is beneficial to ensuring the stability of the volute 210, and the sprayed steam and the blades of the impeller 220 are cleaned at a certain angle, so that the vibration frequency of the action of the airflow and the blades is changed, and the noise in the cleaning process is reduced.

In some embodiments, in order to further increase the cleaning area and reduce the cleaning noise, the plurality of air inlet holes 213 are arranged along the thickness direction of the scroll 210 and are disposed at an angle to the axis of the impeller 220. That is, the extending direction of the air inlet holes 213 and the axial direction of the impeller 220 form a deviation included angle, which is greater than zero and smaller than 45 °, for example, 5 ° to 30 °. Like this, when guaranteeing the contained angle between injection steam and the blade (reduce the noise in the cleaning process by a wide margin), still prolong the effective area of the washing region that a plurality of inlet ports 213 formed on impeller 220 to increased the washing area to impeller 220, be favorable to improving the cleaning performance.

In the process of washing the impeller 220 by injecting steam, the impeller 220 is rotated at a predetermined rotation speed, and steam can be injected to any position of the impeller 220 as the impeller rotates. Due to the particular arrangement of the flow lines within the volute 210, there is a difference in pressure within the volute 210. On the side far away from the air outlet 212 of the blower 200, the pressure at the upper right corner of the impeller 220 is higher, which is the high-speed area of the airflow in the volute 210. That is, taking the rotation axis of the impeller 220 as the center, the included angle between the connection line between the scroll 210 and the rotation axis of the impeller 220 and the horizontal plane is greater than or equal to 30 °, and the region less than or equal to 60 ° is the high speed region, taking 40 ° to 50 ° as an example. In the high velocity region of the gas flow, steam may be allowed to flush the blades at a faster rate, thereby improving the cleaning effect of the impeller 220.

Referring to fig. 4 to 6, in some embodiments, in order to improve the cleaning effect, the volute 210 is disposed in the casing 100 of the range hood to be inclined with respect to a vertical plane, and the liquid heater 300 is disposed in a horizontal direction. The range hood has many forms, wherein, in the near-suction type range hood and the side-suction type range hood, the fan 200 can be obliquely arranged, so that the air inlet 211 of the fan 200 is inclined towards the smoke collection cavity (which can be the front side of the range hood), and the smoke can be more smoothly drawn away. At this time, since the spiral case 210 is inclined from the vertical surface, the liquid heater 300 can be set to be horizontal, so that the working stability of the liquid heater 300 can be ensured, and the inclination angle between the injected steam and the blade can be ensured, thereby changing the vibration frequency of the interaction between the air flow and the blade, and effectively reducing the noise in the cleaning process.

Referring to fig. 1 to 3, in some embodiments, to improve the cleaning effect, the scroll 210 is vertically disposed, and the liquid heater 300 extends in an axial direction of the impeller 220. Taking a european style cigarette making machine as an example, in the working process of the european style cigarette making machine, the fan 200 is vertically arranged, the liquid heater 300 is tangent to the volute 210, and the length direction of the liquid heater extends along the thickness direction of the volute 210. At this time, the liquid heater 300 is disposed corresponding to the high speed region of the scroll 210 and is located between 40 ° and 50 ° at the upper right of the impeller 220. The air inlet hole 213 faces the middle of the volute 210 and deviates from the axis of the impeller 220, so that the steam can be sprayed on the blades in a large area, and the air flow and the blades have inclination angles, thereby changing the vibration frequency of the interaction between the air flow and the blades and effectively reducing the noise in the cleaning process.

In order to improve the cleaning effect of the range hood, a control method of the range hood is provided below, and the control method comprises the following steps:

s10, starting the heating pipe 350 of the liquid heater 300 to heat the heating element 310;

specifically, in the self-cleaning process of the range hood, the heating pipe 350 is first turned on to heat the heating element 310. The heating tube 350 is disposed on the heating body, and the temperature of the heating body rapidly and uniformly rises along with the operation of the heating tube 350.

The trigger condition for turning on the heating pipe 350 of the evaporator may be receiving a cleaning command. The cleaning instruction can be an instruction sent by an external mobile terminal or an instruction obtained from the external terminal or a server; the processing result may be obtained by detection, calculation, or the like. If a dirt detection sensor (for example, an optical sensor) is arranged, when the dirt degree is detected to be greater than or equal to a preset degree, self-cleaning is directly and automatically started, or self-cleaning is carried out in a time period when the use frequency of a user is very low or even the user is not used according to the use habit of the user, such as 2-5 points in the morning. Of course, when the degree of contamination is greater than or equal to the preset degree, a prompt message (sound, light, vibration, short message) may be sent to the outside to remind the user to manually start cleaning, or a cleaning instruction may be sent. That is, before the step of turning on the heating tube 350 of the liquid heater 300 to heat the heating element 310, the step of obtaining a cleaning command is also included. Therefore, the self-cleaning is ensured to be in accordance with the use habit or use requirement of the user at the moment, and is consistent with the use of the user, so that the phenomenon that the user carries out self-cleaning in the cooking process (using the range hood) can not occur.

The mode of judging whether the range hood should be cleaned currently can be judged according to the working time of the range hood, namely the effective working time can also be used as a relevant factor of a cleaning instruction. The specific judgment method is as follows:

acquiring the accumulated working time of the range hood;

the accumulated working time of the range hood refers to the accumulated working time of the current period, and the calculator is reset after self-cleaning at each time, so that the preset working time compared at each time can be ensured to be equivalent, the calculation stability is improved, and the accuracy of the cleaning opportunity is improved. In some embodiments, in order to improve the accuracy of the time calculation, the operating time is the time for extracting the oil smoke, and the idling time (the time for rotating without the oil smoke) of the range hood is not counted in the operating time. Of course, in some embodiments, in order to further improve the accuracy of the cleaning time, it may be considered to set a proportionality coefficient for the corresponding operating time period according to the cooking manner. For example, when the cooking mode generates more oil smoke (frying, deep-frying and the like), the proportionality coefficient of the working time is more than 1, and the working time can be set to be 1.1, 1.2, 1.3 and the like according to different cooking modes; when the cooking mode generates less oil smoke (steaming, boiling, etc.), the proportionality coefficient of the working time is less than 1, and can be set to 0.9, 0.8, 0.7, etc. according to different cooking modes. Therefore, the proper self-cleaning time can be calculated more accurately.

And determining that the accumulated working time is greater than or equal to the preset working time, and sending a cleaning prompt outwards.

And comparing the accumulated working time length with the preset working time length, when the accumulated working time length is greater than or equal to the preset working time length, considering that the range hood is dirty and needs to be cleaned, and sending a cleaning prompt outwards to prompt a user that the current range hood needs to be cleaned. When the accumulated working time is shorter than the preset working time, the range hood is considered to be cleaner and does not need cleaning, and a cleaning prompt is not sent outwards at the moment.

S20, determining that the current temperature of the heating element 310 is higher than or equal to a preset temperature;

the current temperature of the heating element 310 is obtained, and the current temperature is compared with the preset temperature, so as to determine the magnitude relation between the current temperature and the preset temperature. When the current temperature is determined to be lower than the preset temperature, no cleaning liquid is supplied to the heating element 310, and when the current temperature is determined to be higher than or equal to the preset temperature, the cleaning liquid is supplied to the heating element.

As to how much cleaning liquid is supplied, a more current value of the temperature is required to determine. When the current temperature of the heating element 310 is greater than or equal to the preset temperature and less than the safe temperature, the cleaning liquid is supplied to the heating element 310 according to the preset amount to generate a large amount of steam. When the current temperature is higher than or equal to the safety temperature, a large amount of cleaning solution needs to be supplied to the heating element 310 to rapidly cool the heating element 310, thereby ensuring the safety of the liquid heater 300.

Specifically, in some embodiments, in order to ensure the safety of the operation of the range hood, after the step of determining that the current temperature of the heating body 310 is higher than the preset temperature, the method further includes:

comparing the temperature of the heating element 310 with the safe temperature;

determining that the temperature of the heating body 310 is greater than or equal to a safe temperature;

the cleaning liquid is supplied into the heating element 310.

When the current temperature is higher than the preset temperature, the current temperature of the heating element 310 is compared with the safe temperature, and when the temperature of the heating element 310 is determined to be higher than or equal to the safe temperature, the cleaning liquid is continuously supplied into the heating element 310 until the current temperature of the heating element 310 is lower than the safe temperature. Thus, even in a sudden situation, the steam output can be increased while ensuring the safety, and the cleaning effect can be improved.

In some embodiments, in order to timely remind the user of the attention, after the step of determining that the current temperature of the heating element is higher than or equal to the preset temperature, the method further includes:

comparing the current temperature and the safe temperature of the heating body;

determining that the current temperature of the heating element is greater than or equal to the safe temperature and lasting for a first preset time;

and controlling the heating element to stop working and sending out an alarm signal.

In this embodiment, the current temperature of the heating element is higher than the safety temperature and is maintained for a period of time, for example, 8 to 15 seconds, for example, 10 seconds. At the moment, the heating element is judged to be dry-burned, and an alarm signal needs to be sent outwards while the heating element stops working. The alarm signal may be a light, vibration, sound, short message, or a combination thereof.

In some embodiments, a working condition related to the above-mentioned fact may occur, and at this time, the method also prompts the user to pay attention to the step of turning on the heating element of the liquid heater to heat the heating element, and then further includes:

determining that the current temperature of the heating element is lower than the preset temperature and lasting for a second preset time;

the difference value between the current temperatures acquired for multiple times within a second preset time length is smaller than the preset temperature difference;

and sending out a fault signal.

And determining that the current temperature of the heating element is lower than the preset temperature and lasting for a second preset time, for example, 1-3 minutes, such as 2 minutes. And collecting the temperature of the heating body for multiple times within a second preset time. The temperature difference between the collected temperatures is less than a predetermined temperature difference, for example, 2 to 5 deg.C, e.g., 3 deg.C. This indicates that the heating element circuit is malfunctioning, and there is a high probability that the heating element circuit is broken. At this time, a fault signal is sent out, and the fault signal can be light, vibration, voice, short message or the combination of the light, the vibration, the voice and the short message.

In some embodiments, in order to further improve the cleaning effect, after the step of determining that the current temperature of the heat-generating body 310 is higher than the preset temperature, the method further includes:

the blower 200 is turned on to rotate the impeller 220 at a predetermined rotational speed.

When the current temperature is higher than or equal to the preset temperature, the cleaning liquid is provided in the heating element, steam is generated, and the fan 200 is cleaned. At this time, the impeller 220 is rotated at a preset rotation speed so that the steam can be sprayed onto all the blades of the impeller 220. At this time, the rotating speed of the impeller 220 is matched with the jet speed of the steam, so that all the blades can be effectively cleaned, and excessive steam overflow can be avoided. At this time, the preset rotation speed of the impeller 220 is positively correlated to the preset temperature and the power of the water pump, and the higher the preset temperature is, the more steam is generated in unit time, so that the higher the pressure in the heating element 310 is, and thus the faster the spraying speed is, the higher the power of the water pump is, the faster the speed of supplying the cleaning solution to the heating element 310 is, and the more steam is generated in unit time.

In order to make the rotation of impeller 220 and the providing more adaptation of washing liquid to fully guarantee the steam volume that provides, both can guarantee cleaning performance and efficiency, avoid causing again that steam leaks, a large amount of comdenstion water to leak the phenomenon appearance such as, open fan 200, so that impeller 220 carries out pivoted concrete step according to predetermined rotational speed and includes:

the fan 200 is turned on in a inching manner;

in each rotation period of the fan 200, the number of times of supplying the cleaning liquid to the heating element at intervals is 2-4 times or the cleaning liquid is continuously supplied to the heating element.

In the self-cleaning process, the working state of the fan 200 is inching work and can be periodic clearance work, so that the cleaning effect can be ensured, and the next cleaning strategy can be realized in real time according to the cleaning effect. That is, in the electric cycle of the fan 200, the steam is injected into the volute 210 for 2-4 times, so that the steam can be efficiently utilized and does not leak out.

Certainly, in some embodiments, the rotation speed of the fan 200 in the period may be set to be different, the setting may be based on whether there is steam to be sprayed at present, when steam is sprayed and enters, the preset rotation speed is higher, and when there is no steam to be sprayed at present, the preset rotation speed may be lower, so that the cleaning efficiency is ensured, and the electric energy may be saved.

S30, inputting cleaning liquid into the heating element 310; the cleaning liquid is atomized after encountering the high-temperature heating element 310, and is sprayed into the volute 210 from the spray hole.

The cleaning liquid may be an aqueous solution or water. The current temperature of the heating element 310 is different, the amount and speed of the cleaning liquid which can be atomized are also different, the higher the temperature of the heating element 310 is, the more the amount of the cleaning liquid which can be atomized is, the lower the temperature of the heating element 310 is, and the less the amount of the cleaning liquid which can be atomized is. After the heating element 310 atomizes the cleaning liquid, the temperature of the heating element 310 is greatly reduced, and at this time, the time length for supplying the cleaning liquid to the heating element 310 next time can be calculated.

As will be described in detail below, the step of inputting and washing into the heating element 310 includes:

inputting a preset amount of cleaning liquid into the heating element 310; the preset amount is related to the current temperature of the heating element 310, and the higher the current temperature is, the larger the preset amount is, the lower the current temperature is, and the smaller the preset amount is.

According to the current temperature of the heating element 310, the cleaning liquid is continuously supplied into the heating element 310 after a preset time interval.

The current temperature of the heating element 310 is reduced under the action of the preset amount of the cleaning solution, and the temperature of the heating tube 350 raised to the heating element 310 within the preset time is estimated according to the current temperature of the heating element 310 and the power of the heating tube 350, so that the amount of the cleaning solution provided to the heating element 310 next time can be calculated in advance. Therefore, the cleaning at every time is very accurate no matter the time and the amount of the cleaning liquid, and the cleaning effect is guaranteed, and meanwhile, the leakage of steam and condensed water is avoided.

The utility model mainly provides a liquid heater 300, mainly be applied to the range hood to wash the spiral case to range hood, increase cleaning strength and effect.

The specific structure of the liquid heater 300 will be mainly described below.

Referring to fig. 11 to 14, in an embodiment of the present invention, the liquid heater 300 includes:

the heating element 310 is provided with a heating cavity 316, and the heating element 310 is provided with a water inlet communicated with the heating cavity 316 and a discharge port for discharging steam;

a heating element 350, said heating element 350 being mounted within said heating cavity 316;

and a nozzle 315, wherein the nozzle 315 is arranged corresponding to the discharge port, so that the steam is sprayed out from the nozzle 315.

Specifically, in the present embodiment, the shape of the heat-generating body 310 may be various, and is exemplified by a flat shell shape. The material of the heating element 310 is, for example, metal such as cast iron or cast aluminum. The heating chamber 316 of the heating element 310 is arranged in a strip shape, and the heating element is arranged along the length direction of the heating chamber. A water inlet is formed at one side of the heating element 310, and a steam outlet or a steam jet is formed at the opposite side.

The nozzles 315 may be of many forms, for example, in a short cylindrical arrangement. The nozzle 315 is provided in a cylindrical shape, and the nozzle 315 has an exhaust hole penetrating along a length direction thereof, the exhaust hole communicating the discharge port and the outside of the liquid heater 300. Steam generated in the heating chamber 316 is ejected from the nozzle 315 under pressure. In some embodiments, the nozzle 315 and the heat generating body 310 are integrally cast in order to simplify the mounting process of the nozzle 315 and the heat generating body 310 and to improve the sealability of the connection between the heat generating body 310 and the nozzle 315.

It is to be noted that, in some embodiments, in order to sufficiently ensure the spray effect, the nozzle includes a base body segment 315a and an introduction segment 315b connected to the base body segment 315a, the base body segment 315a is mounted on the heat-generating body, the length of the base body segment 315a corresponds to the thickness of the side wall of the heat-generating body, and the introduction segment 315b is configured to protrude into the area to be cleaned. After the leading-in section 315b stretches into the area to be cleaned, steam and/or hot water can be sprayed to the preset position accurately, so that efficient and accurate cleaning is achieved, and the leading-in section 315b can be used for installing a sealing structure.

In this embodiment, when steam is required to be generated for cleaning, the heating element 350 is firstly started to heat the heating element 310, when the temperature of the heating element 310 reaches a preset temperature, a washing liquid is injected into the heating cavity 316 through the water inlet, the washing liquid is changed from a liquid state into a high-temperature high-pressure gaseous state under the high-temperature action of the heating element 310 and the heating element 350, and the generated high-temperature steam is directly sprayed to a position to be cleaned through the nozzle 315, so that the distance between the steam generation position and the steam use position is greatly shortened, the high-temperature high-pressure steam can quickly and accurately reach the position to be cleaned, the pressure, the speed and the temperature of the steam flowing to the position to be cleaned are favorably improved, and the cleaning effect is; in addition, the liquid heater 300 in the application is very simple in structure, convenient to miniaturize, and beneficial to installing the liquid heater 300 to a position close to a position to be cleaned, so that the liquid heater 300 is very flexible to use.

In some embodiments, in order to improve the sealing between the liquid heater 300 and the object to be cleaned, the liquid heater 300 further includes a second gasket 370, and the second gasket 370 is sleeved on the nozzle 315. Taking the volute as an example, when the liquid heater 300 is installed on the volute, the steam is prevented from leaking from the nozzle 315 and the air inlet hole, and meanwhile, the oil smoke in the volute is also prevented from leaking from the air inlet hole. Meanwhile, the direct contact between the volute and the heating element 310 made of the conductive material can be avoided, the phenomenon of electric leakage or circuit break is avoided, and the use safety of the liquid heater 300 is improved.

Referring to fig. 15 and 16, in some embodiments, in order to further improve the sealing property between the liquid heater 300 and the side wall surrounding the region to be cleaned, the second sealing gasket 370 includes a compression part 372, the compression part 372 has elasticity and is sleeved on the nozzle 315, and the compression part 372 is disposed between the heat generating body and the side wall surrounding the region to be cleaned to seal the gap between the heat generating body and the side wall surrounding the region to be cleaned.

The volute 210 is taken as an example of the side wall enclosing the region to be cleaned, the region to be cleaned is inside the volute 210, when the liquid heater 300 is mounted on the volute 210, the compression part 372 elastically deforms under the action of pressure, and the compression part 372 is filled in a gap between the heating body and the volute 210 under the action of deformation restoring force, so that the sealing effect is achieved.

In some embodiments, in order to further improve the sealing performance of the second gasket 370, a compression groove 373 is formed on a peripheral side wall of the compression part 372. When compression portion 372 receives external force extrusion, be out of shape more easily, take place bigger deformation, can be better fill up the clearance between heat-generating body and spiral case 210 under the effect of elasticity restoring force to reach further sealed effect. Meanwhile, through the arrangement of the compression groove 373, the material consumption of the second sealing gasket 370 can be reduced, and the material is saved.

In the embodiment, in order to further improve the sealing capability of the second sealing gasket 370, the second sealing gasket 370 further includes a blocking portion 371, the blocking portion 371 is fixedly connected to the compressing portion 372, the blocking portion 371 wraps the outer side wall of the nozzle 315, and the nozzle 315 and the blocking portion 371 pass through air inlet holes opened on the side wall enclosing the area to be cleaned.

Specifically, the second sealing gasket 370 is shaped like a circular cake, a blocking portion 371 protrudes from the middle of the second sealing gasket 370, the through hole of the nozzle 315 passes through the blocking portion 371, and the blocking portion 371 partially penetrates through the air inlet hole 213 to enter the interior of the volute. Therefore, the periphery of the air inlet hole 213 is guaranteed to be sealed, so that steam can only enter the volute from the nozzle 315, and the steam in the volute is prevented from leaking from the periphery of the air inlet hole 213. In some embodiments, the blocking portion is disposed in a tapered shape, so that the blocking portion 371 can block the air inlet holes 213 with different apertures, which is beneficial to improving the adaptability of the liquid heater 300, and meanwhile, the tapered shape can compensate for the situation that the air inlet holes 213 are enlarged due to a processing error, which is beneficial to improving the sealing performance of the liquid heater 300.

In some embodiments, to facilitate maintenance and cleaning of the heating chamber 316, a mounting opening 311 is provided in the heater 310 to provide a location for cleaning and maintenance. The position of the mounting opening 311 may be various, and is exemplified by being opened at an end of the heating element 310. Specifically, an installation opening 311 communicated with the heating cavity 316 is formed in an end portion of the heating element 310, the liquid heater 300 further comprises an end cover 313 and a first sealing gasket 312, and the end cover 313 is arranged corresponding to the installation opening 311; the first seal 312 is disposed between the end cap 313 and the mounting opening 311.

In this embodiment, the heating element 310 is flat, so that the heating element 310 has two oppositely arranged surfaces with a large area, one of the surfaces can be provided with a water inlet, and can also be provided with a temperature controller 360, a temperature sensor 390, and the like, and the other surface is provided with nozzles 315, and then the mounting opening 311 is arranged at the end of the heating element 310, so that the space around the heating element 310 is fully utilized, and the structural compactness of the whole liquid heater 300 is improved. In order to close the mounting opening 311 during operation, the liquid heater 300 further includes an end cap 313 and a soft first sealing gasket 312, and the first sealing gasket 312 may be made of rubber and/or silica gel. The heating element 310 which forms the mounting opening 311 is provided with a mounting hole, the end cover 313 is fixedly connected with the heating element 310 through the matching of a fastener and the mounting hole, and the fastener can be a screw, a bolt and the like. The first gasket 312 is positioned between the end cap 313 and the heating element 310, and is pressed and attached to the heating element 310 by the end cap 313 to close the mounting opening 311.

In some embodiments, in order to facilitate the simplicity of routing and installation of the heating element 350, an opening is formed in one side of the heating element 310, and the live wire and neutral wire connectors of the heating element 350 are exposed to the heating element 310 through the opening. The inlet and outlet are located on the same side of the heating element 310. The heating member 350 is an electric heating member 350, for example, an electric heating tube, and two ends of the heating member 350 are positions where a live wire and a neutral wire of the heating member 350 are connected. Both ends of the heating member 350 are partially exposed through the openings, so that external wires are easily electrically connected to the heating member 350. Meanwhile, the stroke of the lead is greatly shortened and simplified, the possibility of failure is reduced, and the working stability of the heating element is improved.

In order to prevent steam from leaking from the opening, the sealing performance and the connection stability between the heating member 350 and the opening are improved, and the live wire and neutral wire joints of the heating member 350 are integrally cast with the heating member 310. That is, the heating member 350 is placed in the mold of the heating member, and then the heating member is cast, so that the heating member 350 is embedded in the heating member. Thus, the connection between the two poles of the heating member 350 and the through opening is realized by casting, and thus, the connection stability and the sealing property between the heating member 350 and the heating body 310 can be sufficiently ensured. Meanwhile, the connection process of the two is also simplified.

Wherein the heating member 350 is disposed in a U-shape, and both free ends of the heating member 350 extend in a direction away from a plane in which the U-shape is located. In this embodiment, the whole appearance of heating member 350 is the setting of U-shaped, and two free ends of keeping away from the position of buckling of heating member 350 extend to the lateral wall of heat-generating body 310 (the lateral wall that has the mouth of a river), make the live wire and the zero line joint of the piece of generating heat be convenient for install, the main part that the piece of guaranteeing to generate heat simultaneously can be fine install in heat-generating body 310.

The heating element is arranged in such a way that the heating element has a position with higher temperature, and the position is positioned at the corner of the heating element, namely the bending position. So that the temperature sensor 390 can detect the temperature of the heating element 310 or the heating element 310 corresponding to the position, and the highest temperature of the heating element or the heating element 310 can be obtained, thereby facilitating detection and control.

In some embodiments, in order to better form vapor and improve the safety of the liquid heater 300, the liquid heater 300 further includes a temperature sensor 390, a fixing hole is provided on a sidewall of the heating body 310 corresponding to a corner of the heating member 350, and the temperature sensor 390 is provided corresponding to the corner of the heating member 350 through the fixing hole. In this embodiment, the temperature sensor 390 may be disposed on an outer sidewall of the heating element 310, or may extend into the heating element 310, and the temperature sensor 390 may detect the temperature of the heating element 310, or may detect the temperature of the heating element 350, for example, the temperature sensor is disposed on an outer sidewall of the heating element 310 to detect the temperature of the heating element 310.

In some embodiments, in order to further improve the safety of the liquid heater 300, the liquid heater 300 further includes a temperature controller 360, the temperature controller 360 is disposed on an outer sidewall of the heating element 310, a lead connected to the heating element 350 is electrically connected to the temperature controller 360, and the temperature controller 360 is connected to a power supply.

Specifically, in this embodiment, the live and neutral connectors of the heating element 350 are led out of wires, and one end of the wires far away from the heating element 350 is electrically connected to the temperature controller 360. When the temperature controller 360 detects that the temperature of the heating element 310 is higher than the safe temperature, the temperature controller 360 disconnects the heating element from the power supply, and forces the heating element to stop working. Thus, the safety of the liquid heater 300 is guaranteed by the temperature controller 360.

For further improvement of safety performance, the number of the temperature controllers 360 is two, and the live wire and the zero wire joints of the heating element 350 are electrically connected with different temperature controllers 360 through wires respectively. The live wire and zero line joint of heating member 350 all are provided with temperature controller 360, realize the dual fail-safe when ultra-temperature, provide dual guarantee for liquid heater 300's security.

Wherein, in order to improve the stability of being connected of heating member 350 and temperature controller 360, heating element 310 has the installation face, the live wire and the zero line joint of heating member 350 expose in the installation face, temperature controller 360 corresponds the live wire and the zero line joint of heating member 350 set up in the installation face. In the present embodiment, the form of the mounting surface may be many, and a plane is taken as an example. The temperature controller 360 corresponds the live wire and the zero line joint setting of heating member 350 for 360 and the live wire and the zero line of heating member connect the distance between very closely, the connection of the wire of being convenient for, thereby reduced the stroke of wire, make the connection receive the influence of environmental factor and reduce by a wide margin, be favorable to reducing the possibility of connecting the trouble.

In some embodiments, in order to protect the thermostat 360 from the external environment, the liquid heater 300 further includes an insulating cover 380 and a protective cover 330, wherein the protective cover 330 is sleeved outside the insulating cover 380;

the protective cover 330 is connected to the heating element 310, so that the insulating cover 380 and the heating element 310 enclose a space for accommodating the temperature controller 360.

Specifically, in the present embodiment, the overall shapes of the protective cover 330 and the insulating cover are similar, and both are disposed in a six-sided housing with one missing side. The material of the insulating cover 380 may include rubber and/or silicone. Of course, in some embodiments, the insulating cover 380 and the protective cover 330 may be integrally formed. The insulation cover 380 and the protection cover 330 are covered on the heating element 310 and form a protection space with the heating element 310, and the temperature controller 360 is located in the protection space. The protective cover 330 can be connected to the heating element 310 in various ways, such as a snap connection, a screw connection, etc. Through the setting of visor 330 and insulating boot 380 for temperature controller 360 obtains effectual protection, avoids external environment to disturb, also avoids 360 electric leakages of temperature controller etc.. Which facilitates safe and reliable operation of the liquid heater 300.

In some embodiments, in order to enable the wire between the temperature controller 360 and the power supply to be conveniently and reliably installed, an avoiding notch is formed in the side wall of the protective cover 330, an installation boss 381 is arranged on the insulating cover corresponding to the avoiding notch, and a wire passing hole 382 for the wire connected with the temperature controller 360 to pass through is formed in the installation boss 381. In this implementation, through the setting of installation boss 381 for the hole depth of crossing line hole 382 obtains effectual increase, thereby has increased the length of spacing wire, makes the wire be difficult for rocking, the effectual stability of guaranteeing the wire in the course of the work.

In order to improve the mounting pad convenience, the side wall of the insulation cover is further provided with a clamping gap 383, one end of the clamping gap 383 is communicated with the wire passing hole 382, and the other end of the clamping gap 383 extends to the edge of the insulation cover to be communicated with the outside. The insulating cover has elasticity, and the clamping gap 383 communicates with the outside of the insulating cover and the wire passing hole 382, so that the wire can enter the insulating cover through the clamping gap 383. So, the connection of temperature controller 360 and external circuit is not limited to visor 330 and insulating boot 380, also the temperature controller 360 can be connected with the external circuit earlier, installs visor 330 and insulating boot 380 again, so, be favorable to the line connection between temperature controller 360 and the external circuit, be favorable to improving liquid heater 300's installation effectiveness.

In order to shorten the length of the conducting wire as much as possible and improve the compactness and stability of the structure, the electrode sheet 361 of the thermostat 360 is disposed close to the wire passing hole 382. The top of the temperature controller 360 is provided with an electrode plate 361, the electrode plate 361 is connected with an external circuit through a lead, and one side with the electrode plate 361 is close to the wire passing hole 382, so that the connection between the electrode plate 361 and the outside can be realized by a very short lead. So, simplified circuit and inside structure, be favorable to improving the stability of drive-by-wire ware work.

The present application also provides a process for manufacturing a liquid heater 300, the process comprising:

a casting mold for casting the heating element 310 is installed;

placing the heating element 350 in a casting mold;

the heating element 310 is cast by pouring a fluid into a casting mold so that the heating element 350 is integrally cast with the heating element 310.

First, a casting mold for casting the heating body 310 is prepared and assembled, then the heating member 350 is placed in the casting mold, and after the heating member 350 is mounted, a high temperature fluid is cast into the casting mold to cast the heating body 310. In this way, the heating element 350 participates in the casting process of the heating element 310, so that the connection between the heating element 350 and the heating element 310 is very reliable, and meanwhile, in some embodiments, in order to sufficiently ensure the heating effect of the heating element 350 on the heating element 310, the heating element may be partially or completely embedded in the side wall of the heating element 310. When the heating member 350 is placed in the casting mold, the live wire and neutral wire joint portions of the heating member 350 are extended into corresponding positions in the casting mold, so that the live wire and neutral wire joint portions of the heating member 350 are protruded out of the side walls of the heating body, thereby being exposed on the outer surface of the heating body 310.

The utility model also provides a range hood, this range hood include spiral case and liquid heater 300, and above-mentioned embodiment is referred to this liquid heater 300's concrete structure, because this range hood has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here. Wherein, a wind wheel is arranged in the volute; the liquid heater 300 is mounted on the volute and the nozzle 315 of the liquid heater 300 extends into the volute.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A liquid heater, comprising:

a heating element mounted within the heating chamber;

2. The liquid heater of claim 1, further comprising a second gasket disposed about the nozzle.

3. The liquid heater of claim 2, wherein the second gasket includes a compression portion having elasticity and fitted over the nozzle, the compression portion being disposed between the heat-generating body and a side wall enclosing the region to be cleaned to seal a gap between the heat-generating body and the side wall enclosing the region to be cleaned.

4. The liquid heater of claim 3, wherein the second gasket further comprises a blocking portion, the blocking portion is fixedly connected with the compression portion, the blocking portion wraps the outer side wall of the nozzle, and the nozzle and the blocking portion penetrate through an air inlet hole formed in the side wall surrounding the area to be cleaned.

5. The liquid heater of claim 3, wherein the compression portion has compression grooves formed in a peripheral side wall thereof.

6. The liquid heater of claim 1, wherein the nozzle is cylindrically shaped and has a vent hole therethrough along a length thereof, the vent hole communicating the discharge port with an exterior of the liquid heater.

7. The liquid heater of claim 6, wherein the nozzle and the heat generating body are integrally cast.

8. The liquid heater according to claim 1, wherein the nozzle comprises a base section which is embedded in the heat-generating body and has a length corresponding to a thickness of a side wall of the heat-generating body, and an introduction section connected to the base section for extending into an area to be cleaned.

9. The liquid heater of claim 1, wherein the end of the heating element is provided with a mounting opening communicated with the heating chamber, the liquid heater further comprises an end cover and a first sealing gasket, and the end cover is arranged corresponding to the mounting opening; the first sealing gasket is arranged between the end cover and the mounting opening.

10. A liquid heater according to claim 1, wherein the heating element is U-shaped and the two free ends of the heating element extend away from the face of the U.

11. The liquid heater of claim 1, further comprising an insulating cover and a protective cover, wherein the protective cover is sleeved outside the insulating cover;

the protective cover is connected with the heating element so that the insulating cover and the heating element are enclosed to form a space for accommodating the temperature controller.

12. The liquid heater of claim 11, wherein the side wall of the protective cover is provided with an avoiding gap, the insulating cover is provided with a mounting boss corresponding to the avoiding gap, and the mounting boss is provided with a wire passing hole for passing a wire connected with the temperature controller.

13. The liquid heater of claim 12, wherein the electrode pads of the thermostat are disposed adjacent to the wire through hole.

14. The liquid heater of claim 11, wherein the side wall of the insulating cover further has a clamping slit, one end of the clamping slit is communicated with the wire through hole, and the other end of the clamping slit extends to the edge of the insulating cover to be communicated with the outside.

15. The liquid heater according to any one of claims 1 to 14, further comprising a temperature sensor, wherein a fixing hole is provided on a side wall of the heat generating body corresponding to a corner of the heating member, and the temperature sensor is provided corresponding to the corner of the heating member through the fixing hole.

16. A range hood, comprising:

the volute is internally provided with a wind wheel;

a liquid heater according to any one of claims 1 to 15, mounted on the volute and having a nozzle which projects into the volute.