CN110859553A - Water spray prevention type steam cleaning machine - Google Patents

Abstract

The invention discloses a water spray prevention type steam cleaning machine, which belongs to the field of household appliances, and comprises a host machine shell, a heater, a water tank and a handle assembly, wherein the heater and the water tank are arranged in the host machine shell, the handle assembly is connected with the host machine shell and can spray steam, the water spray prevention type steam cleaning machine also comprises an internal circulation system, the handle assembly comprises a reversing valve and a trigger, and the internal circulation system comprises: connect steam conduit between heater and the switching-over valve, connect return line and connection between water tank and the switching-over valve water outlet pipe between water tank and the heater, the switching-over valve can change the flow direction of steam under the control of trigger, steam cleaning machine still includes and is used for controlling heater heating power's frequency conversion switch, in order to realize steam inner loop when steam cleaning machine standby state. The water spray prevention type steam cleaner disclosed by the invention can realize that the internal circulation of steam is kept in the equipment in the standby process, the generation of condensed water is avoided, and the control is convenient and simple.

Description

Water spray prevention type steam cleaning machine

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of household appliances, in particular to a water spray prevention type steam cleaning machine.

[ background of the invention ]

The steam cleaner utilizes high-temperature and high-pressure steam to clean floors, doors, windows, clothes, range hoods, air conditioners, microwave ovens and sanitary wares to sterilize the surfaces, remove tiny dust and bacteria, is environment-friendly and sanitary, and almost has zero damage to the cleaning articles. In the steam cleaning machine in the prior art, when the use is stopped temporarily, the heater in the steam cleaning machine stops heating, the steam is cooled into water, and the sprayed steam is mixed with the previous condensed water when the steam cleaning machine is used again, so that inconvenience is brought to users.

[ summary of the invention ]

The invention aims to solve the technical problem of overcoming the defects of the prior art and provides the water-spraying-proof steam cleaning machine, which realizes that the internal circulation of steam is kept in the equipment in the standby process, avoids the generation of condensed water and has convenient and simple control.

In order to solve the technical problems, the invention adopts the following technical scheme:

prevent water spray formula steam cleaner, include the host computer shell, install heater, water tank in the host computer shell and with the handle assembly that can spray steam is connected to the host computer shell, still include inner circulating system, handle assembly includes switching-over valve and trigger, inner circulating system includes: connect steam conduit between heater and the switching-over valve, connect return line and connection between water tank and the switching-over valve water outlet pipe between water tank and the heater, the switching-over valve can change the flow direction of steam under the control of trigger, steam cleaning machine still includes and is used for controlling heater heating power's frequency conversion switch, in order to realize steam inner loop when steam cleaning machine standby state.

The water outlet pipeline transmits water in the water tank to the heater after the trigger is pulled down, the heater heats the water into steam, the steam is sprayed out from the handle assembly along the steam pipeline and can be used for cleaning and disinfection, the working state of the water spray prevention type steam cleaning machine is realized, the steam cleaning machine enters a standby state after the trigger is loosened, the heater keeps heating to generate steam to keep the steam inside the equipment to circulate, at the moment, the steam in the steam pipeline enters the return pipeline, the steam in the steam pipeline and the return pipeline are kept to flow under the pushing of the continuously generated steam, the steam is prevented from being cooled into water, the problem that the steam in the pipeline of the steam cleaning machine in the standby process is cooled into water and can spray out condensed water after entering the working state again is solved, the experience of a user is improved, the flow direction of the steam can be controlled by the reversing valve, so that normal steam spraying and the steam circulation inside the equipment are realized, the frequency conversion switch can change the power of the heater to adjust the speed of generating steam, and can reduce the heating power, reduce the steam flow and reduce the power consumption when the steam is internally circulated.

Furthermore, the reversing valve comprises a valve body, a valve core, a first valve cavity and a second valve cavity which are communicated with each other, the steam pipeline is communicated with the backflow pipeline and the first valve cavity, one end of the valve core extends out of the valve body and is in contact with the trigger, and the trigger is triggered to control the valve core to move so as to change the flow direction of steam in the reversing valve. The switching-over valve has steam to flow through the flow direction that changes steam at the operating condition of difference in order to keep equipment inside, prevents the production of comdenstion water, and the removal of case receives the control of trigger, and the flow direction of steam is realized through pulling the trigger promptly, and the trigger steam cleaner of pulling down can spray steam sterilization, disinfection, clearance, loosens the change of trigger back steam flow direction, prevents that the comdenstion water from producing, and control mode is simple and convenient, and the user has better use to experience.

Furthermore, a sealing ring a, a sealing ring b and a sealing ring c are arranged on the valve core, the valve core is matched with the first valve cavity through the sealing ring, the steam pipeline is communicated with the second valve cavity when the steam cleaning machine is in a working state, and the steam pipeline is communicated with the return pipeline when the steam cleaning machine is in a standby state. The valve core can drive the three sealing rings to move when moving, thereby realizing the control of the flow direction of the steam in the valve body, controlling the flow direction of the steam to only push the trigger to control the valve core to move, being simple and convenient to use, and increasing the user experience.

Furthermore, a thin tube connected with the return pipeline is arranged in the water tank. Steam can pass into the tubule through return line, let in from the tubule in the water of water tank again in to the tubule that contacts with water can be with the heat conduction to the aquatic of steam, thereby can retrieve the heat of steam, improve the temperature of water tank water-logging, the heater can be more easily with water heating into steam, reduced the energy consumption, shortened the time that produces steam, in the same heat time, the steam heat of production is higher, the disinfection effect of disinfecting is better.

Further, the thin tube is spiral; alternatively, the tubule is serpentine. The overall length of the spiral or snake-shaped tubule is longer, the contact area with water is larger, and when steam is in the transmission process, the heat exchange can be better and fully completed, and the efficiency is increased.

Further, the heater includes heating pipe and the water pipe of laminating each other, the water pipe is equipped with two interfaces in vertical direction, outlet conduit with below interface connection, steam conduit with top interface connection. The heating pipe can generate heat and transfer the heat into the water pipe through the joint with the water pipe, water in the water pipe can be heated, the space in the water pipe is limited, the internal pressure can be increased under the action of high heat, steam with higher temperature can be generated, and the cleaning capability of the steam cleaning machine is enhanced; if water is introduced from the upper port, water flows rapidly downward along the pipe, so that sufficient heating cannot be obtained, and generated steam is difficult to be ejected from the lower port; in addition, through the heating mode of water pipe and heating pipe, it is not high to sealed requirement, only need firmly stable can in the kneck of water pipe.

Further, the heating pipe and the water pipe are coiled into a spiral shape and are stacked at intervals; or the heating pipe and the water pipe are coiled into a spiral shape, wherein the heating pipe is coiled outside the water pipe or the water pipe is coiled outside the heating pipe; or one of the heating pipe and the water pipe is wrapped outside the other pipe.

The water flow in the water pipe can continuously absorb heat generated by the heating pipe in the flowing process, and the spiral water pipe and the heating pipe are longer in length, so that sufficient heating can be ensured to generate steam;

when the water pipe is wound outside the heating pipe, the temperature of the heating pipe can be prevented from being transferred to the shell of the host machine, and meanwhile, the generated heat can be continuously and uniformly radiated on the water pipe to stably heat water flow; when the heating pipe is wrapped outside the water pipe, the water pipe can obtain heat through being in contact with the heating pipe, meanwhile, the heat generated by the heating pipe can also be radiated inwards, although the heat can also be radiated outwards, the heating pipe is spiral, the heat is diffused when being radiated outwards, the heat is concentrated and diffused when being radiated inwards, and water flow in the water pipe can absorb more heat radiation;

when the heating pipe is wound outside the water pipe, the contact area between the water pipe and the heating pipe is large, the water in the water pipe can be heated more quickly to generate steam, the handle assembly can quickly spray the steam after the machine is started and the trigger is pressed, and the waiting heating time is extremely short; when the water pipe is wound outside the heating pipe, the utilization rate of the heat of the heating pipe can reach the maximum, excessive heat emission is prevented, and the energy utilization rate is improved.

Further, when the steam cleaning machine is in a working state, the heating pipe keeps a first power, and when the steam cleaning machine is in a standby state, the heating pipe keeps a second power, wherein the second power is smaller than the first power. First power is higher, and the temperature that the heating pipe produced this moment is higher, and is faster to the rate of heating of water, and consequently the steam flow that produces also can be bigger, speed is faster, satisfies the user demand, and in the standby process, first power reduces to the second power, can reduce the flow of steam, only keeps that steam cleaner inside has steam to flow, has prevented the production of comdenstion water to energy consumption when having reduced the standby.

Furthermore, the frequency conversion switch comprises a microswitch and a control panel for detecting the trigger state of the microswitch, the microswitch is triggered after the trigger is pulled down, the steam cleaner enters the working state, the microswitch stops triggering after the trigger is loosened, the steam cleaner enters the standby state, and the steam circulation is kept inside the steam cleaner. The microswitch is matched with the control panel to be used to play a role of a sensor, the microswitch can be triggered after the trigger is pulled down, and after the trigger is loosened, the microswitch stops triggering to control the state of the steam cleaner and the working power of the heating pipe, so that the microswitch is high in precision, low in cost and capable of flexibly controlling the steam flow in different states.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic view of a steam cleaner according to an embodiment of the present invention;

FIG. 2 is a schematic view of the internal structure of the steam cleaner in the embodiment of the present invention;

FIG. 3 is a schematic view of the steam flow of the steam cleaner in standby mode according to the embodiment of the present invention;

FIG. 4 is a schematic view of the steam flow of the steam cleaner in operation according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a water tank according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a heater according to an embodiment of the present invention;

FIG. 7 is a schematic view of the internal structure of a heater according to an embodiment of the present invention;

FIG. 8 is a schematic structural view of a water pipe and a heating pipe according to a fourth embodiment of the present invention;

FIG. 9 is a schematic structural view of a handle assembly in an embodiment of the present invention;

FIG. 10 is a schematic view of the switch valve of the steam cleaner in standby mode according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a reversing valve when the steam cleaner works according to the embodiment of the invention.

Reference numerals:

a host housing 100;

heater 200, heating pipe 210, water pipe 220, interface 230;

a water tank 300;

a handle assembly 400, a trigger 410, a handle housing 420, a microswitch 430, a control panel 440;

the reversing valve 500, the valve body 510, the valve core 520, the first valve cavity 530, the second valve cavity 540, the spring 550, a sealing ring a561, a sealing ring b562 and a sealing ring c 563;

steam pipe 610, return pipe 620, outlet pipe 630 and tubule 640.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example one

Referring to fig. 1 and 2, the present invention provides a water spray prevention type steam cleaner, including a main body housing 100, a heater 200 installed in the main body housing 100, a water tank 300, and a handle assembly 400 connected to the main body housing 100 and spraying steam, and further including an internal circulation system, the handle assembly 400 including a direction valve 500 and a trigger 410, the internal circulation system including: a steam pipe 610 connected between the heater 200 and the direction changing valve 500, a return pipe 620 connected between the water tank 300 and the direction changing valve 500, and a water outlet pipe 630 connected between the water tank 300 and the heater 200, wherein the direction changing valve 500 can change the flow direction of the steam under the control of the trigger 410, and the steam cleaning machine further comprises a variable frequency switch for controlling the heating power of the heater 200 to realize the internal circulation of the steam when the steam cleaning machine is in a standby state.

Referring to fig. 3 and 4, after the trigger 410 is pulled down, the water outlet pipe 630 transfers water in the water tank 300 to the heater 200, the heater 200 heats the water into steam, the steam can be used for cleaning and disinfection after being sprayed out from the handle assembly 400 along the steam pipe 610, and this is the working state of the water spray proof steam cleaner (in fig. 4, the arrow below the water outlet pipe 630 is the flow direction of water flow, the arrows outside the handle assembly 400 and the steam pipe 610 are the flow direction of steam, and the arrow at the trigger 410 is the pulling direction thereof), after the trigger 410 is released, the steam cleaner enters the standby state, the heater 200 keeps heating to generate steam to keep the internal steam circulation of the steam device, at this time, the steam in the steam pipe 610 enters the return pipe 620, and under the push of the continuously generated steam, the steam is kept flowing in the steam pipe 610 and the return pipe 620, thereby preventing the steam from being cooled into water, thereby solved steam cleaner in the standby process steam cooling of pipeline into water, the condition that can spout the comdenstion water after the reentrant operating condition, user's experience sense has been increased, the flow direction of steam can be controlled to switching-over valve 500, in order to realize that normal steam sprays and the inside steam cycle of equipment, the speed that produces steam can be adjusted to the power that the frequency conversion switch can change heater 200, can reduce heating power when the steam inner loop, reduce the steam flow, reduce the consumption.

Referring to fig. 3 (in fig. 3, except for an arrow at the upper right corner of the water tank 300, which is a water flow direction, the remaining arrows are steam flow directions), the process of circulation in the steam cleaner is: the water outlet pipe 630 transfers water in the water tank 300 into the heater 200, and steam is generated after heated and flows into the direction change valve 500 along the steam pipe 610, and the direction change valve 500 changes the flow direction of the steam, introduces the steam into the return pipe 620, and then flows back to the water tank 300 from the return pipe 620. Therefore, the steam flow is kept in the pipeline inside the cleaning machine, and the condensed water cannot be generated.

In addition, steam in the internal circulation process contains a large amount of heat, the heat should be effectively utilized, avoid wasting, for this reason be equipped with in the water tank 300 with tubule 640 that backflow pipeline 620 is connected, refer to fig. 5, steam can pass into tubule 640 through backflow pipeline 620, let in from tubule 640 again to the water in the water tank 300, and tubule 640 with water contact can conduct the heat of steam to aquatic, thereby can retrieve the heat of steam, improve the temperature of water in the water tank 300, heater 200 can heat water into steam more easily, the energy consumption is reduced, the time of producing steam has been shortened, in the same heat-up time, the steam heat of production is higher, the disinfection effect is better.

In order to improve the heat exchange rate, set up tubule 640 as the heliciform, strengthened the length of tubule 640, with the area of contact increase of water to steam is in the transmission course, can be better, accomplish thermal exchange fully, increase efficiency, the material of tubule 640 is the brass, the brass has good heat conductivility, can carry out the heat exchange better, and set up tubule 640 as snakelike, also can realize same technological effect.

Example two

The present embodiment specifically describes the structure of the heater 200 on the basis of the first embodiment, specifically:

in the steam cleaning machine in the prior art, a heating device is generally arranged in a water tank, the principle is similar to that of a pressure cooker, the steam generation speed is low, the flow rate is low, and the requirement on air tightness is extremely high.

In the present invention, the heater 200 includes a heating pipe 210 and a water pipe 220 which are attached to each other, referring to fig. 6 and 7, two connectors 230 are provided on the water pipe 220 in a vertical direction, the water outlet pipe 630 is connected to the lower connector 230, the steam pipe 610 is connected to the upper connector 230, the heating pipe 210 can generate heat and transfer the heat into the water pipe 220 by attaching to the water pipe 220, water in the water pipe 220 can be heated, a space in the water pipe 220 is limited, internal pressure can be increased under the action of high heat, steam with higher temperature can be generated, cleaning ability of the steam cleaner is enhanced, and heating time is shorter because water flow in the pipe is smaller.

When water flows in from the lower port 230 of the water pipe 220, the water can flow upwards along the pipe, the heating is completed in the flowing process, and the steam generated in the heating process can flow out from the upper port 230 upwards along the pipe, so that the steam can be stably and continuously generated; if water is supplied from the upper port 230, the water flows down the pipe quickly, and thus sufficient heating cannot be obtained, and the generated steam is not easily ejected from the lower port 230.

The heating mode of the water pipe 220 and the heating pipe 210 has low sealing requirement, and only the joint 230 of the water pipe 220 needs to be firm and stable.

The power of the heating pipe 210 is different between the working state and the standby state of the steam cleaner, the heating pipe 210 maintains a first power when the steam cleaner is in the working state, and the heating pipe 210 maintains a second power when the steam cleaner is in the standby state, wherein the second power is less than the first power; in addition, the heater 200 further includes an electromagnetic pump (not shown), the electromagnetic pump is used for driving water to flow in the water pipe 220, the flow rate of the water supplied into the water pipe 220 by the electromagnetic pump is also different between the working state and the standby state of the steam cleaner, when the steam cleaner is in the working state, the electromagnetic pump keeps the first flow rate of the water in the water pipe 220, when the steam cleaner is in the standby state, the second flow rate of the water in the water pipe 220 is kept by the electromagnetic pump, and the first flow rate is greater than the second flow rate.

The first power is higher, the temperature generated by the heating pipe 210 is higher at the moment, and the heating speed of water is higher, so that the flow rate of generated steam is also higher and the speed is higher, the use requirement is met, and at the moment, the water supply amount of the electromagnetic pump is also kept at the first flow rate, so that the consumed water flow can be supplemented in time; when the steam cleaner is in a standby state, the first power is reduced to the second power, the temperature generated by the heating pipe 210 is reduced, the first flow is reduced to the second flow, and the water supply amount of the electromagnetic pump is reduced, so that steam with smaller flow and slower flow speed is generated, the steam flowing in the steam cleaner is kept, the generation of condensed water is prevented, and the energy consumption in the standby state is reduced.

EXAMPLE III

In this embodiment, a structure of the heating pipe 210 and the water pipe 220 is proposed on the basis of the second embodiment, referring to fig. 7, the heating pipe 210 and the water pipe 220 are coiled into a spiral shape, the water flow in the water pipe 220 can continuously absorb the heat generated by the heating pipe 210 in the flowing process, and the spiral water pipe 220 and the heating pipe 210 are longer in length, so that sufficient heating can be ensured to generate steam, the water pipe 220 is wrapped outside the heating pipe 210, the temperature of the heating pipe 210 can be prevented from being transmitted to the main machine housing 100, and the generated heat can be continuously and uniformly radiated on the water pipe 220 to stably heat the water flow.

Certainly, the heating pipe 210 may be wrapped around the water pipe 220, the water pipe 220 may not only obtain heat through contact with the heating pipe 210, but also the heat generated by the heating pipe 210 may be radiated inwards, although the heat may also be radiated outwards, because the heating pipe 210 is spiral, the heat is diffused when being radiated outwards, and is concentrated when being radiated inwards, and the water flow in the water pipe 220 may absorb more heat radiation.

Example four

Different from the third embodiment, the present embodiment provides another two structures of the heating pipe 210 and the water pipe 220, specifically:

referring to fig. 8, the heating pipe 210 and the water pipe 220 are spirally wound and stacked with a space therebetween. Different from the third embodiment, the length of the heating pipe 210 and the water pipe 220 in the present embodiment is not as long as that in the third embodiment, but the two are stacked, so that the contact area between the water pipe 220 and the heating pipe 210 is larger, that is, the water flow is heated more uniformly, the steam generation speed is faster, the utilization rate of the heat generated by the heating pipe 210 is higher, and the occupied space is less.

The other structure is as follows: one of the heating pipe and the water pipe is wrapped outside the other pipe.

When the heating pipe is wound outside the water pipe, the contact area between the water pipe and the heating pipe is large, the water in the water pipe can be heated more quickly to generate steam, the handle assembly can quickly spray the steam after the machine is started and the trigger is pressed, and the waiting heating time is extremely short;

when the water pipe is wound outside the heating pipe, the utilization rate of the heat of the heating pipe can reach the maximum, excessive heat emission is prevented, and the energy utilization rate is improved.

EXAMPLE five

The present embodiment provides a structure of the reversing valve 500 on the basis of the first embodiment, specifically: referring to fig. 9 to 11, the direction valve 500 includes a valve body 510, a valve core 520, a first valve chamber 530 and a second valve chamber 540 communicating with each other, the steam pipe 610 and the return pipe 620 communicating with the first valve chamber 530, one end of the valve core 520 extending out of the valve body 510 to be in contact with the trigger 410, wherein one end of the second valve chamber 540 communicates with the first valve chamber 530 and the other end thereof is opened for spraying steam.

The valve core 520 is positioned in the first valve cavity 530, one end of the valve core is positioned in the second valve cavity 540, the other end of the valve core extends out of the valve body 510 and keeps contact with the trigger 410, the handle assembly 400 further comprises a handle shell 420, the reversing valve 500 is installed in the handle shell 420, in the using process, an operator holds the handle shell 420 for using, one part of the trigger 410 is positioned outside the handle shell 420, the other part of the trigger is positioned inside the shell, the trigger 410 is connected to the handle shell 420 through a rotating shaft, the valve core 520 and the valve body 510 keep elastic contact through a spring 550, when the valve core 520 is pushed by pulling down the trigger 410 to move, the spring 550 can accumulate elastic potential energy, and after the trigger 410 is released, the elastic potential.

The position of case 520 is different, the steam flow direction is also different in the switching-over valve 500, a plurality of sealing rings have on the case 520, sealing effect through sealing ring and the different positions of valve pocket, flow direction in order to change steam, thereby realize the inside steam circulation of equipment flows, prevent the production of comdenstion water, the removal of case 520 receives trigger 410's control, the flow direction of steam realizes through pulling trigger 410 promptly, the trigger 410 steam cleaner of pulling down can spray steam sterilization, the disinfection, the clearance, loosen trigger 410 back steam flow direction change, control mode is simple and convenient, the user has better use experience.

The sealing rings comprise a sealing ring a561, a sealing ring b562 and a sealing ring c563, the sealing ring a561 and the sealing ring b562 are located in the first valve cavity 530, the sealing ring c563 is located in the second valve cavity 540, the sealing ring a561 can prevent steam from flowing out of the first valve cavity 530 into the handle housing 420, referring to fig. 11, when the steam cleaning machine is in a working state, the sealing ring a561 and the sealing ring b562 are located on two sides of the backflow pipeline 620 to prevent the steam from flowing into the backflow pipeline 620, and the steam directly enters the second valve cavity 540 from the steam pipeline 610 and then is sprayed out; referring to fig. 10, when the steam cleaner is in a standby state, the steam pipe 610 is communicated with the return pipe 620, and the sealing ring c563 is positioned between the communication positions of the first valve chamber 530 and the second valve chamber 540 to block the steam from flowing into the second valve chamber 540, thereby controlling the flow direction of the steam in the valve body 510.

EXAMPLE six

This embodiment specifically describes the structure of the variable frequency switch, and specifically: the frequency conversion switch is used for detecting whether the steam cleaning machine is in a working state or a standby state so as to change the heating power of the heating pipe 210 and the water flow provided by the electromagnetic pump.

Preferably, referring to fig. 10 and 11, the variable frequency switch includes a micro switch 430 and a control board 440, the control board 440 can detect a trigger state of the micro switch 430, the micro switch 430 has high precision and low cost, and can flexibly control steam flow rate in different states, the position of the valve core 520 can be controlled by pulling the trigger 410, the micro switch 430 can be triggered after pulling the trigger 410, the heating pipe 210 is heated at a first power after the control board 440 detects that the micro switch 430 is triggered, the electromagnetic pump controls water flow rate in the water outlet pipe 630 to be a first flow rate, the micro switch 430 stops triggering after the trigger 410 is released, the power of the heating pipe 210 is reduced to a second power, the water flow rate in the water outlet pipe is also reduced at the same time, and steam internal circulation with small flow rate in the cleaner is maintained.

When the control board 440 does not detect the trigger signal of the micro switch 430 after a period of time, the steam cleaner stops working, so that continuous power consumption caused by the fact that the cleaner is in a standby state all the time after forgetting to shut down the steam cleaner is avoided, certain potential safety hazards are caused, and the time can be controlled to be 5 minutes or 10 minutes.

In addition, whether the steam flows in the return pipeline or not can be detected as a basis for judging whether the cleaning machine is in a working state or a standby state.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (9)

1. Prevent water spray formula steam cleaner, include the host computer shell, install heater, water tank in the host computer shell and with the handle assembly that can spray steam is connected to the host computer shell, its characterized in that still includes inner circulating system, handle assembly includes switching-over valve and trigger, inner circulating system includes: connect steam conduit between heater and the switching-over valve, connect return line and connection between water tank and the switching-over valve water outlet pipe between water tank and the heater, the switching-over valve can change the flow direction of steam under the control of trigger, steam cleaning machine still includes and is used for controlling heater heating power's frequency conversion switch, in order to realize steam inner loop when steam cleaning machine standby state.

2. The water spray prevention steam cleaner of claim 1, wherein the reversing valve comprises a valve body, a valve core, a first valve cavity and a second valve cavity which are communicated with each other, the steam pipeline is communicated with the first valve cavity and the return pipeline, one end of the valve core extends out of the valve body and is in contact with the trigger, and the valve core can be controlled to move by pulling the trigger so as to change the flow direction of steam in the reversing valve.

3. The water spray prevention type steam cleaner according to claim 2, wherein the valve core is provided with a sealing ring a, a sealing ring b and a sealing ring c, and the valve core keeps the steam pipeline communicated with the second valve cavity when the steam cleaner is in a working state and keeps the steam pipeline communicated with the return pipeline when the steam cleaner is in a standby state through the matching of the sealing ring and the first valve cavity.

4. The water spray prevention steam cleaner of claim 1, wherein a thin tube connected to the return line is provided in the water tank.

5. The water spray resistant steam cleaner of claim 4 wherein the tubules are helical; alternatively, the tubule is serpentine.

6. The steam cleaner of claim 1, wherein the heater comprises a heating pipe and a water pipe, the heating pipe and the water pipe are attached to each other, the water pipe has two joints in a vertical direction, the water outlet pipe is connected to the lower joint, and the steam pipe is connected to the upper joint.

7. The water spray resistant steam cleaner of claim 6 wherein the heating tube and the water tube are coiled in a spiral and stacked in spaced relation to one another; or the heating pipe and the water pipe are coiled into a spiral shape, wherein the heating pipe is coiled outside the water pipe or the water pipe is coiled outside the heating pipe; or one of the heating pipe and the water pipe is wrapped outside the other pipe.

8. The water spray prevention steam cleaner of claim 7, wherein the heating pipe maintains a first power in an operating state of the steam cleaner, and the heating pipe maintains a second power in a standby state of the steam cleaner, the second power being less than the first power.

9. The steam cleaner of one of claims 1 to 8, wherein the variable frequency switch comprises a microswitch and a control board for detecting the trigger state of the microswitch, the microswitch is triggered after the trigger is pulled down, the steam cleaner enters the working state, the microswitch stops triggering after the trigger is released, the steam cleaner enters the standby state, and the steam circulation is kept inside the steam cleaner.

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