Respirator for cleaning machine, cleaning machine and control method of cleaning machine

Abstract

The present invention relates to a respirator for a washing machine, a washing machine, and a control method for the washing machine, wherein the respirator includes a housing provided with a breathing port and an exhaust port; a fan including an outer shell provided with an air inlet in fluid communication with the breathing port and an air outlet in fluid communication with the exhaust port; an impeller rotatably disposed in the housing; and a driving member connected to the impeller and capable of controlling the speed of the impeller. The fan can adjust the impeller speed of the fan according to the parameters of the air flow flowing into the housing, thereby adjusting the exhaust rate. When the respirator is used in a washing machine, the exhaust rate can be adjusted according to the pressure in the inner tank, thereby preventing excessive discharge of high-temperature gas, which would cause heat loss and high energy consumption and be detrimental to the rapid drying of tableware, and preventing the gas discharge rate from being too slow, which would cause excessive pressure in the inner tank, which would not only be unsafe but also affect the drying effect of the tableware.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a respirator for a cleaning machine, the cleaning machine and a control method for the cleaning machine. Background Art

[0002] A dishwasher is a household appliance that can automatically wash dishes, plates, pots, etc., which greatly frees people's hands. The breather is an important component of the dishwasher. It has the function of balancing the pressure in the inner tank. It can release the gas in the dishwasher's inner tank to balance the high-pressure gas generated in the inner cavity when the dishwasher is working, thereby ensuring the normal operation of the dishwasher. Especially during the tableware drying stage, the hot air flow enters the inner tank, which can easily cause the pressure in the inner tank to increase. In other words, the high-temperature gas generated when the dishwasher is working causes the air pressure in the inner tank to be too high, and gas exchange with the outside world through the exhaust channel is required to balance the air pressure in the dishwasher's inner tank. The high-temperature gas in the inner tank is discharged through the exhaust channel.

[0003] For example, the Chinese invention patent application with patent number CN201910127515.0 (publication number CN109700409 A) discloses a "Dishwasher Breather and Its Dishwasher", which includes an upper shell and a lower shell, a breathing port is provided on the upper shell or the lower shell, the upper shell and the lower shell are fixedly connected to each other, and a water supply channel, a drainage channel, a condensation channel, a first anti-siphon channel, a second anti-siphon channel and a regenerated water chamber are formed therein; wherein, the inner wall of the breathing port is provided with a disconnecting threaded portion, and is fixedly arranged on the inner tank of the dishwasher through the disconnecting threaded portion, and the breathing port is connected to the water supply channel, and / or the drainage channel, and / or the condensation channel, and / or the first anti-siphon channel, and / or the second anti-siphon channel, and / or the regenerated water chamber; the first anti-siphon channel is at least partially located below the water supply channel and passes through below the water supply channel.

[0004] When the pressure in the inner liner is high, the high-temperature gas can be discharged through the breathing port and the atmospheric vent, thereby balancing the air pressure inside and outside the inner liner. However, in actual use, the above patent cannot properly discharge the gas according to the pressure in the inner liner, because the air pressure in the inner liner is not fixed. The structure of the above patent easily makes it possible for the air pressure in the inner liner to be too high and the gas cannot be discharged quickly, or excessively discharge high-temperature gas, resulting in heat energy loss. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a respirator for a cleaning machine that can adjust the exhaust rate according to airflow parameters in response to the current status of the existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a cleaning machine using the above-mentioned respirator that can adjust the exhaust rate according to the pressure in the inner liner in response to the current status of the existing technology.

[0007] The third technical problem to be solved by the present invention is to provide a control method for the above-mentioned cleaning machine in view of the current status of the existing technology.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a respirator comprising

[0009] A housing, wherein the housing is provided with a breathing port and an exhaust port;

[0010] It is characterized by: also including

[0011] A fan, comprising

[0012] A housing, wherein the housing is provided with an air inlet in fluid communication with the breathing port and an air outlet in fluid communication with the exhaust port;

[0013] An impeller is rotatably disposed in the housing;

[0014] A driving member is connected to the impeller and can control the rotation speed of the impeller.

[0015] The speed of the fan impeller can be adjusted manually, but in order to be able to intelligently adjust the speed of the fan impeller according to the gas parameters, the respirator also includes a sensor and a controller. The sensor is arranged on the flow path of the airflow and is used to detect the parameters of the airflow; the controller is arranged on the shell, the input end of the controller is electrically connected to the sensor, and the output end of the controller is electrically connected to the drive part of the fan. The controller can control the drive part according to the signal detected by the sensor, and then control the impeller speed.

[0016] In order to enable the fan to connect the breathing port and the exhaust port, the breathing port and the air inlet of the shell are fluidly connected through a first air flow channel, and the air outlet of the shell and the exhaust port of the shell are fluidly connected through a second air flow channel; because the gas flows upward, the breathing port is located below the exhaust port so that the gas flows upward to the exhaust port for discharge.

[0017] Preferably, the two opposing walls of the first airflow channel extending in the direction of airflow are both symmetrically arranged and wavy, and the upstream and downstream ends of the first airflow channel both converge in the direction of airflow. This allows airflow to ascend along the curved surface, and the width of the first airflow channel is narrower near the upstream and downstream ends. This design facilitates the collection of hot steam at the upstream end and the gathering of hot steam at the downstream end, allowing the hot steam to pass quickly through the fan to the exhaust port. Furthermore, after the dishwasher stops operating, the hot steam condenses and can flow back along the curved wall to the breathing port.

[0018] Preferably, there are two breathing ports arranged side by side so that the hot air flow can be discharged quickly, so that the internal and external air pressures of the inner tank of the cleaning machine are balanced.

[0019] To save space, a water flow channel can be integrated into the respirator. The bottom of the housing is provided with a water inlet and a water outlet. The housing contains a water flow channel connecting the inlet and the outlet. The water flow channel includes an upwardly extending upward channel and a downwardly extending downward channel. The lower end of the upward channel is in fluid communication with the water inlet, the upper end of the upward channel extends upward to connect with the upper end of the downward channel, and the lower end of the downward channel is in fluid communication with the water outlet. Integrating the water flow channel into the respirator not only saves space but also utilizes the residual heat of the inner tank to heat the water in the water flow channel, which then enters the inner tank to wash the dishes.

[0020] Preferably, an anti-siphon structure is provided between the upward channel and the downward channel, and the anti-siphon structure includes a bending channel and a turning channel, the bending channel is arched upward in an arc shape, one end of the bending channel is fluidically connected with the upper end of the upward channel, the turning channel is also in an upward arched arc shape and is arranged side by side below the bending channel, one end of the turning channel is fluidically connected with the other end of the bending channel, and the other end of the turning channel is fluidically connected with the upper end of the downward channel, and a vent is provided on the bottom wall of the turning channel. Due to the arc-shaped structure of the bending channel and the rotating channel, the water flow will be accelerated when passing through, and under the action of centrifugal force, it will pass tangentially through the rotating channel instead of flowing out from the vent, and the vent can maintain its function of connection with the atmosphere; when negative pressure is generated at the water inlet, the water in the water flow channel and the water softener connected to it will tend to flow back due to siphoning, but because the vent is connected to the atmosphere, the air in the atmosphere can enter the rotating channel through the vent, balancing the negative pressure of the water inlet and ensuring that the water in the water flow channel does not flow back.

[0021] Although water theoretically won't flow out of the vent, there's still a very small chance that it will flow out of the vent due to gravity. Therefore, a through-hole is provided on the wall of the first airflow channel, located below the vent. The through-hole is fluidically connected to the vent via a guide channel, and the vent is located in the flow path of water entering from the through-hole. This way, after water flows out of the vent, it flows along the guide channel into the vent and finally into the inner tank.

[0022] Preferably, the housing is further provided with a condensate channel, the upper end of which is in fluid communication with the second air flow channel, and the lower end of which is in fluid communication with the water outlet. This can reduce the outflow of condensate and prevent condensate from contaminating the outer shell of the dishwasher located outside the inner tank.

[0023] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a cleaning machine, characterized in that: it includes an inner liner and the above-mentioned respirator, the shell is installed on the inner liner, the inner part of the inner liner has a washing chamber, the inner liner is provided with a steam outlet connected to the washing chamber by fluid, the steam outlet faces the breathing port on the shell and the two are fluidically connected.

[0024] In order to facilitate the connection between the respirator and the inner liner, the shell is installed on the inner liner through a connecting piece. The connecting piece includes a connecting sleeve that is threadedly connected to the breathing port through the steam outlet. A pressing portion that can press the inner liner against the shell is radially formed on the periphery of the connecting sleeve. A center ring is provided in the central part of the connecting sleeve. The outer wall surface of the center ring and the inner wall surface of the connecting sleeve are connected by a connecting strip, thereby forming a connecting port between the center ring and the connecting sleeve.

[0025] To facilitate the rotation of the connector, which passes through the liner and is then threaded into the housing, the center ring has a hexagonal cross-section. This allows the respirator to be installed and removed using a hexagonal wrench, eliminating the need for a dedicated fixture and reducing the manufacturing cost of the fixture.

[0026] The technical solution adopted by the present invention to solve the third technical problem is: a control method of the above-mentioned cleaning machine, characterized in that it includes the following steps:

[0027] (1) After the sensor collects the airflow parameters, it transmits the corresponding signal to the controller;

[0028] (2) The controller compares the received signal with a pre-set threshold value to adjust the impeller speed of the fan to an appropriate gear.

[0029] In the above solution, in step (1), the sensor transmits the voltage signal Ui to the controller; in step (2), a voltage threshold is preset on the controller. Of course, the sensor can also transmit a current signal to the controller, and a current threshold is preset on the controller.

[0030] In the above solution, four voltage thresholds U1, U2, U3, and U4 are preset on the controller. The blower has five working gears with gradually increasing impeller speeds, namely extremely weak, weak, medium, strong, and super strong. If Ui < U1, the controller controls the blower to work in the extremely weak gear; if U1 < Ui < U2, the controller controls the blower to work in the weak gear; if U2 < Ui < U3, the controller controls the blower to work in the medium gear; if U3 < Ui < U4, the controller controls the blower to work in the strong gear; if Ui > U4, the controller controls the blower to work in the super strong gear.

[0031] Compared with the prior art, the advantages of the present invention are as follows: By setting up the blower, the present invention can adjust the impeller speed of the blower according to the airflow parameters flowing into the housing, thereby adjusting the exhaust rate; when the respirator is applied to a dishwasher, it can adjust the exhaust rate according to the pressure in the inner tank, which can not only prevent excessive discharge of high-temperature gas, resulting in heat energy loss, high energy consumption, and being unfavorable for rapid drying of dishes, but also prevent the gas discharge rate from being too slow, causing excessive pressure in the inner tank, which is not only unsafe but also affects the drying effect of the dishes. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the respirator according to an embodiment of the present invention;

[0033] Figure 2 is Figure 1 a schematic structural diagram of another direction of ;

[0034] Figure 3 is Figure 1 a schematic structural diagram of with the second housing and the water flowmeter removed;

[0035] Figure 4 is Figure 3 a schematic diagram of the fluid flow of ;

[0036] Figure 5 is Figure 1 a sectional view of ;

[0037] Figure 6 is Figure 5 an enlarged view of part C of ;

[0038] Figure 7 is Figure 3 an enlarged view of part B of ;

[0039] Figure 8 is Figure 1 Schematic diagram of the structure of the connecting parts;

[0040] Figure 9 for Figure 1 Structural diagram of the water flow meter in FIG;

[0041] Figure 10 for Figure 1 A cross-sectional view of a respirator mounted on an inner liner;

[0042] Figure 11 for Figure 10 Enlarged view of point D. DETAILED DESCRIPTION

[0043] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0044] like Figures 1 to 11 As shown, the cleaning machine of this preferred embodiment includes an inner liner 1 and a respirator A. The respirator A includes a shell 2, a breathing port 21 is provided on the shell 2, a washing chamber 11 is provided inside the inner liner 1, and a steam outlet 12 is provided on the inner liner 1 that is fluidically connected to the washing chamber 11. The shell 2 is installed on the inner liner 1, and the steam outlet 12 faces the breathing port 21 on the shell 2 and the two are fluidically connected.

[0045] like Figure 11 As shown, in this embodiment, the shell 2 is installed on the inner liner 1 through a connecting member 3. The connecting member 3 includes a connecting sleeve 31 that is threadedly connected to the breathing port 21 through the steam outlet 12. A pressing portion 30 that can press the inner liner 1 against the shell 2 is radially formed on the periphery of the connecting sleeve 31. A gasket 10 is provided between the inner liner 1 and the shell 2.

[0046] like Figure 8 As shown, a center ring 32 is provided in the center of the connecting sleeve 31. A connecting strip 33 connects the outer wall of the center ring 32 to the inner wall of the connecting sleeve 31, thereby forming a communication port 34 between the center ring 32 and the connecting sleeve 31. The center ring 32 has a hexagonal cross-section, allowing the respirator to be installed and removed using an Allen wrench, eliminating the need for a dedicated fixture and reducing the manufacturing cost of the dedicated fixture.

[0047] The fluid (water flow, air flow) can be connected between the inner tank 1 and the shell 2 through the connecting port 34. Of course, the connecting member 3 is not limited to the structural form provided in this embodiment, and can also be other structural forms, such as screws, etc., so that the steam outlet 12 and the breathing port 21 are directly facing each other to allow fluid to pass through.

[0048] like Figure 2 、 3As shown in FIGS. 5 and 6, in this embodiment, there are two breathing ports 21 arranged side by side. The housing 2 is further provided with an exhaust port 22. The breathing port 21 is located below the exhaust port 22. A blower 4 is provided in the housing 2. The blower 4 includes a housing 41, an impeller 42 and a driving member. The driving member can be a motor, and the impeller 42 can be a centrifugal impeller or an axial flow impeller or other impeller structures.

[0049] An air inlet 411 fluidly connected to the breathing port 21 and an air outlet 412 fluidly connected to the exhaust port 22 are formed on the housing 41. The impeller 42 is rotatably arranged in the housing 41. The driving member is drivingly connected to the impeller 42 and can control the rotation speed of the impeller 42.

[0050] The rotation speed of the impeller 42 of the blower 4 can be adjusted manually. For example, the rotation speed of the blower 4 can be adjusted to a certain gear manually. However, in order to intelligently adjust the rotation speed of the impeller 42 of the blower 4 according to gas parameters, the respirator further includes a sensor 5 and a controller. The sensor 5 is arranged on the airflow path to detect the parameters of the airflow; the controller is arranged on the housing 2. The input end of the controller is electrically connected to the sensor 5, and the output end of the controller is electrically connected to the driving member of the blower 4. The controller can control the driving member according to the signal detected by the sensor 5, and further control the rotation speed of the impeller 42.

[0051] The control method for adjusting the exhaust rate of this cleaning machine includes the following steps:

[0052] (1) After the sensor 5 collects the airflow parameters (the parameters can be at least one of the temperature, humidity, flow rate, and pressure of the airflow), it transmits the corresponding voltage signal Ui to the controller. The sensor 5 in this embodiment is a humidity sensor 5;

[0053] (2) The controller compares the received voltage signal Ui with the pre-set voltage threshold to adjust the rotation speed of the blower 4 to a suitable gear; specifically, in this embodiment, four voltage thresholds U1, U2, U3, and U4 are pre-set on the controller. The blower 4 has five working gears of extremely weak, weak, medium, strong, and super strong with the increasing rotation speed of the impeller 42. If Ui < U1, the controller controls the blower 4 to work in the extremely weak gear; U1 < Ui < U2, the controller controls the blower 4 to work in the weak gear; U2 < Ui < U3, the controller controls the blower 4 to work in the medium gear; U3 < Ui < U4, the controller controls the blower 4 to work in the strong gear; Ui > U4, the controller controls the blower 4 to work in the super strong gear (for example, in the drying stage of the cleaning machine, increasing the exhaust rate can promote the rapid drying of the dishes).

[0054] As can be seen from the above, during operation, the sensor 5 on the first air flow channel 23 below constantly detects the humidity of the gas and feeds back the corresponding signal to the controller. The controller pre-sets four voltage thresholds, namely U1, U2, U3, and U4. The controller compares the signal strength level transmitted by the sensor 5 with the four voltage thresholds respectively, makes a judgment, and then sends an instruction to the fan 4. The fan 4 adjusts the gear of the fan 4 according to the received instruction, increases the exhaust rate or decreases the exhaust rate, thereby realizing the adjustment of the exhaust rate of the respirator.

[0055] like Figure 3 、 6 As shown, the breathing port 21 is fluidically connected to the air inlet 411 of the housing 41 via a first airflow channel 23, and the air outlet 412 of the housing 41 is fluidly connected to the exhaust port 22 of the shell 2 via a second airflow channel 24. The two opposing walls 231 of the first airflow channel 23, extending along the airflow direction, extend in a wavy pattern and are symmetrically arranged. Both the upstream and downstream ends of the first airflow channel 23 converge along the airflow direction. The upstream end refers to the position where the first airflow channel 23 is adjacent to the breathing port 21, and the downstream end refers to the position where the first airflow channel 23 is adjacent to the air inlet 411 of the housing 41.

[0056] This allows the airflow to move upward along the curved surface. The airflow path is as follows: Figure 4 As shown in path B in FIG. The width of the first airflow channel 23 is narrower at the upstream and downstream ends. This design facilitates the collection of hot steam at the upstream end and the gathering of hot steam at the downstream end, allowing the hot steam to pass quickly under the action of the fan 4 and reach the exhaust port 22. Moreover, after the cleaning machine stops working, the hot steam condenses and can flow back to the breathing port 21 along the curved wall surface 231.

[0057] There are also multiple strip-shaped air diffusion holes 25 on the wall of the shell 2. The air diffusion holes 25 discharge the hot steam between the outer shell and the inner tank 1 of the cleaning machine (the outer shell is located outside the inner tank 1). The exhaust port 22 can discharge the hot steam into the atmosphere after being connected to the pipe. The exhaust port 22 diverts part of the hot steam to avoid excessive water vapor being discharged to the inner wall of the shell 41. Over time, condensed water causes the inner wall of the shell 41 to rust.

[0058] like Figure 5 As shown, the housing 2 is provided with a socket 26 for inserting the sensor 5. The sensor 5 is provided with an elastic arm 51 that can deform perpendicularly to the insertion direction of the sensor 5. When the sensor 5 is inserted into the socket 26, the elastic arm 51 is interference fit with the socket 26.

[0059] like Figure 3As shown, the respirator of this embodiment is integrated with a water flow channel. A water inlet 271 and a water outlet 272 are provided at the bottom of the shell 2. A water flow channel is provided in the shell 2 to connect the water inlet 271 and the water outlet 272. The water flow channel includes an upwardly extending upward channel 273, a downwardly extending downward channel 274, and an anti-siphon structure provided between the upward channel 273 and the downward channel 274. The anti-siphon structure includes a bending channel 275 and a rotation channel 276. The bending channel 275 is arched upward in an arc shape. The revolving channel 276 is also in an upwardly arched arc shape and is arranged side by side below the bending channel 275. The lower end of the upward channel 273 is in fluid communication with the water inlet 271, and the upper end of the upward channel 273 extends upward to be in fluid communication with one end of the bending channel 275. One end of the revolving channel 276 is in fluid communication with the other end of the bending channel 275, and the other end of the revolving channel 276 is in fluid communication with the upper end of the descending channel 274. The lower end of the descending channel 274 is in fluid communication with the water outlet 272. The water flow path is as follows. Figure 4 As shown in path A.

[0060] A vent 2761 is provided on the bottom wall of the revolving channel 276. Due to the curved structure of the curved channel 275 and the revolving channel 276, water accelerates as it passes through. Under the action of centrifugal force, it passes tangentially through the revolving channel 276, rather than flowing out of the vent 2761. Furthermore, the vent 2761 maintains its connection to the atmosphere. When negative pressure is generated at the water inlet 271, water in the water flow channel and the connected water softener will tend to flow back due to siphoning. However, because the vent 2761 is connected to the atmosphere, air in the atmosphere can enter the revolving channel 276 through the vent 2761, balancing the negative pressure at the water inlet 271 and ensuring that the water in the water flow channel does not flow back.

[0061] Although water theoretically won't flow out of the vent 2761, there's still a very small chance that it will flow out of the vent 2761 due to gravity. Therefore, a through hole 2311 is provided on the wall 231 of the first airflow channel 23. This through hole 2311 is located below the vent 2761. The through hole 2311 and the vent 2761 are fluidically connected via the guide channel 28. The breathing port 21 is located in the flow path of water entering through the through hole 2311. Thus, after water flows out of the vent 2761, it flows along the guide channel 28 into the breathing port 21 and finally into the inner liner 1.

[0062] A receiving portion 2730 is provided in the upstream channel 273. A water flow meter 2731 is provided in the receiving portion 2730. The water flow meter 2731 is electrically connected to the input of the controller to detect the water flow rate. The output of the controller is electrically connected to the water inlet valve described below. In this embodiment, the water inlet 271 is connected to an external water source, and the water outlet 272 is connected to the water inlet of the water softener. After being softened by the water softener, the water enters the washing chamber 11 of the inner tank 1 to wash tableware, fruits, and vegetables. Otherwise, if the water enters the washing chamber 11 directly without being softened, high water hardness will, on the one hand, cause scale to form on the surface of the heating device in the washing machine, seriously hindering heat conduction and causing perforation corrosion, leading to damage to the heating element. On the other hand, the surface of the washing machine and the washed tableware will be unclean, affecting the washing quality of the washing machine. The water softener can adopt an existing structure, such as shown in the "A Water Softener 6 and a Dishwasher" disclosed in the Chinese Utility Model Patent No. CN202022097007.3 (Announcement No. CN214017448U).

[0063] When the user uses the cleaning machine, he first connects the water pipe and power supply, selects the washing program, and then starts to take in water. The water first enters the water flow channel through the water inlet valve. The water flow meter 2731 sends a signal to the controller in real time. The controller determines whether the water flow has reached the preset value. If it has reached the preset value, the water inlet valve is closed to stop the water supply. If it has not reached the preset value, the water inlet valve remains open and the water flows into the water softener until the water flow value reaches the preset value, and then the water supply is stopped.

[0064] The housing 2 is also provided with a condensed water channel 29, the upper end of which is in fluid communication with the second air flow channel 24, and the lower end of which is in fluid communication with the water outlet 272. This can reduce the outflow of condensed water and prevent the condensed water from contaminating the outer shell 41 of the cleaning machine located outside the inner tank 1. Figure 4 As shown in path C.

[0065] The shell 2 in this embodiment is composed of an upper shell 201 and a lower shell 202. The upper shell 201 and the lower shell 202 can be fixed together by a hot melt sealing process. The upper shell is provided with a plug-in column, and the lower shell is provided with a column. The column is provided with a socket for inserting the column to guide the upper shell and the lower shell during installation.

[0066] The "fluid communication" referred to in the present invention refers to the spatial positional relationship between two components or parts, hereinafter collectively referred to as the first part and the second part, that is, fluid gas, liquid or a mixture of the two can flow from the first part along the flow path and / or be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A respirator comprising A housing (2), wherein the housing (2) is provided with a breathing port (21) and an exhaust port (22), and the housing (2) is formed by combining an upper housing (201) and a lower housing (202); Its characteristics are: Also includes A fan (4), the fan (4) comprising A housing (41), wherein the housing (41) is provided with an air inlet (411) in fluid communication with the breathing port (21) and an air outlet (412) in fluid communication with the exhaust port (22); an impeller (42) rotatably disposed in the housing (41); A driving member, the driving member is connected to the impeller (42) and can control the rotation speed of the impeller (42); The breathing port (21) is in fluid communication with the air inlet (411) of the housing (41) via a first air flow channel (23), and the air outlet (412) of the housing (41) is in fluid communication with the exhaust port (22) of the casing (2) via a second air flow channel (24), and the breathing port (21) is located below the exhaust port (22); The two opposite wall surfaces (231) of the first airflow channel (23) extending along the airflow direction are both extended in a wave shape and symmetrically arranged, and the upstream end and the downstream end of the first airflow channel (23) are both contracted along the airflow direction; There are two breathing ports (21) arranged side by side.

2. The respirator according to claim 1, wherein: The invention also includes a sensor (5) and a controller, wherein the sensor (5) is arranged on the flow path of the airflow and is used to detect the parameters of the airflow; the controller is arranged on the housing (2), the input end of the controller is electrically connected to the sensor (5), and the output end of the controller is electrically connected to the driving element of the fan (4), and the controller can control the driving element according to the signal detected by the sensor (5), thereby controlling the rotation speed of the impeller (42).

3. The respirator according to claim 2, characterized in that: The bottom of the shell (2) is provided with a water inlet (271) and a water outlet (272); the shell (2) has a water flow channel communicating with the water inlet (271) and the water outlet (272); the water flow channel comprises an upwardly extending upward channel (273) and a downwardly extending downward channel (274); the lower end of the upward channel (273) is in fluid communication with the water inlet (271); the upper end of the upward channel (273) extends upward to communicate with the upper end of the downward channel (274); and the lower end of the downward channel (274) is in fluid communication with the water outlet (272).

4. The respirator according to claim 3, characterized in that: An anti-siphon structure is provided between the upward channel (273) and the downward channel (274). The anti-siphon structure includes a bent channel (275) and a rotary channel (276). The bent channel (275) arches upward in an arc shape. One end of the bent channel (275) is in fluid communication with the upper end of the upward channel (273). The rotary channel (276) also arches upward in an arc shape and is arranged side by side below the bent channel (275). One end of the rotary channel (276) is in fluid communication with the other end of the bent channel (275). The other end of the rotary channel (276) is in fluid communication with the upper end of the downward channel (274). An air vent (2761) is provided on the bottom wall of the rotary channel (276).

5. The respirator according to claim 4, characterized in that: A through hole (2311) is formed on the wall surface (231) of the first air flow channel (23). The through hole (2311) is located below the air vent (2761). The through hole (2311) is in fluid communication with the air vent (2761) through a diversion channel (28). The breathing port (21) is located on the flow path of the water flow entering from the through hole (2311).

6. The respirator according to claim 3, characterized in that: A condensate water channel (29) is further provided in the housing (2). The upper end of the condensate water channel (29) is in fluid communication with the second air flow channel (24). The lower end of the condensate water channel (29) is in fluid communication with the water outlet (272).

7. A cleaning machine, characterized in that: It includes an inner tank (1) and the respirator according to any one of claims 2 to 6. The housing (2) is installed on the inner tank (1). A washing cavity (11) is provided inside the inner tank (1). A steam outlet hole (12) is formed on the inner tank (1) and is in fluid communication with the washing cavity (11). The steam outlet hole (12) faces the breathing port (21) on the housing (2) and the two are in fluid communication.

8. A control method for a cleaning machine according to claim 7, characterized in that: It includes the following steps: (1) After the sensor (5) collects the air flow parameters, it transmits the corresponding signal to the controller; (2) The controller compares the received signal with a pre-set threshold value to adjust the impeller speed of the fan (4) to an appropriate gear.

9. The control method according to claim 8, characterized in that: In step (1), the sensor (5) transmits a voltage signal Ui to the controller; in step (2), a voltage threshold value is pre-set on the controller.

10. The control method according to claim 9, characterized in that: Four voltage threshold values U1, U2, U3, and U4 are pre-set on the controller. The fan (4) has five working gears with gradually increasing impeller speeds: extremely weak, weak, medium, strong, and super strong. If Ui < U1, the controller controls the fan (4) to work in the extremely weak gear; U1 < Ui < U2, the controller controls the fan (4) to work in the weak gear; U2 < Ui < U3, the controller controls the fan (4) to work in the medium gear; U3 < Ui < U4, the controller controls the fan (4) to work in the strong gear; Ui > U4, the controller controls the fan (4) to work in the super strong gear.

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