Check valve, range hood, and cleaning method

Abstract

This application belongs to the field of electrical equipment technology, specifically relating to a check valve, a range hood, and a cleaning method. The check valve includes a valve body and a valve plate. The valve body has a through exhaust channel, and spray holes are provided on the side wall of the air inlet end of the exhaust channel. The valve plate is connected to the valve body to open or close the exhaust channel. The spray holes are located on the side of the valve plate facing the air inlet end of the exhaust channel. This application can not only clean the inside of the range hood but also the check valve and the exhaust pipe connected to it, achieving degreasing and odor removal effects, thereby improving the cleaning effect of the range hood, enhancing the user experience, and demonstrating excellent practicality.

Description

Technical Field

[0001] This application belongs to the field of electrical equipment technology, specifically relating to a check valve, a range hood, and a cleaning method. Background Technology

[0002] In related technologies, range hoods can only be cleaned inside, limiting the cleaning scope and leaving room for improvement. Summary of the Invention

[0003] This application provides a check valve, a range hood, and a cleaning method, which aims to at least partially address the technical problem that range hood cleaning can only clean the interior of the range hood.

[0004] In a first aspect of this application, a check valve is provided, the check valve comprising: a valve body having a through exhaust channel, wherein a spray hole is provided on the side wall of the air inlet end of the exhaust channel; and a valve plate connected to the valve body to open or close the exhaust channel; wherein the spray hole is located on the side of the valve plate facing the air inlet end of the exhaust channel.

[0005] In some implementations, the spray hole includes a first spray hole with its outlet facing the valve plate.

[0006] In some embodiments, the spray hole includes a second spray hole located on the side of the valve plate facing the air inlet end of the exhaust duct.

[0007] In some implementations, the outlet end of the second spray hole is positioned away from the valve plate.

[0008] In some implementations, multiple first spray holes are arranged at circumferential intervals around the exhaust channel, and multiple second spray holes are arranged at circumferential intervals around the exhaust channel.

[0009] In some implementations, the first spray hole is disposed between the second spray hole and the valve plate.

[0010] In some implementations, the valve body is provided with a first spray chamber and a second spray chamber, the first spray chamber being connected to the first spray hole and the second spray chamber being connected to the second spray hole.

[0011] In a second aspect, this application provides a range hood, the range hood comprising: a body having an exhaust vent; the aforementioned check valve connected to the body, and the exhaust duct communicating with the exhaust vent.

[0012] In some embodiments, the range hood further includes a heater and a first pump body, the heater being connected to the spray nozzles via the first pump body.

[0013] In some embodiments, the range hood further includes a washing box and a second pump body, the washing box being used to store detergent, and the washing box being connected to the spray nozzles via the second pump body.

[0014] In a third aspect, this application also provides a method for cleaning a range hood, the cleaning method comprising:

[0015] When the check valve closes the exhaust channel, the cleaning medium is sprayed out from the spray hole to clean the inside of the machine body;

[0016] When the check valve opens the exhaust channel, the cleaning medium is sprayed from the spray hole to clean the check valve and the flue pipe connected to the check valve.

[0017] The check valve, range hood, and cleaning method provided in this application feature a check valve with a through-flow exhaust channel. A valve plate connects to the valve body. When the range hood fan is not running or running at low speed, the valve plate closes the exhaust channel. When the fan runs at high speed, the valve plate actuates under the airflow within the exhaust channel to open it. A first spray hole is located on the side wall of the exhaust channel's inlet end, facing the valve plate. When the check valve closes the exhaust channel, cleaning media is sprayed from the spray hole to clean the interior of the unit. When the check valve opens the exhaust channel, cleaning media is sprayed from the spray hole to clean the check valve and the connected flue pipe. This expands the spray range of the cleaning media, cleaning not only the interior of the range hood but also the check valve and the connected flue pipe, achieving degreasing and odor removal effects. This improves the cleaning effect of the range hood, enhances the user experience, and demonstrates excellent practicality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of the range hood 10 in one or more embodiments of this application is shown;

[0020] Figure 2 It shows Figure 1 Another structural diagram from another perspective;

[0021] Figure 3 It shows Figure 1 An explosion diagram;

[0022] Figure 4 A schematic diagram of the check valve 300 is shown.

[0023] Figure 5 It shows Figure 4 Another structural diagram from another perspective;

[0024] Figure 6 It shows Figure 4 A frontal view diagram;

[0025] Figure 7 It shows Figure 6 Enlarged view of point A;

[0026] Figure 8 A schematic diagram of the water circuit of the range hood 10 is shown;

[0027] Figure 9 A schematic diagram of the water circuit of the range hood 10 is shown.

[0028] Explanation of reference numerals in the attached figures:

[0029] Range hood -10;

[0030] Body-100, exhaust vent-101, groove-102;

[0031] Fan-200;

[0032] Check valve-300, valve body-301, valve plate-302, exhaust duct-303, spray hole-304, first spray hole-3041, second spray hole-3042, connecting part-305, connecting port-306, first connecting pipe-307, second connecting pipe-308;

[0033] Heater-400;

[0034] First pump body -500;

[0035] Washing box - 600;

[0036] Second pump body - 700. Detailed Implementation

[0037] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] Range hoods, as a common kitchen appliance, are widely used in kitchens to quickly remove and exhaust cooking fumes outdoors. During operation, grease and grime adhere to the inside of the range hood, and over time, this can cause grease and grime to drip from the internal walls onto the stovetop or clog the grease filter, thus affecting the range hood's performance. Therefore, regular cleaning of the range hood's interior is necessary. Currently, cleaning range hoods mainly relies on manual labor, which is time-consuming, labor-intensive, and results in a poor user experience. Some range hoods have automatic cleaning devices, but these have limited cleaning range, only cleaning the inside of the hood and not the check valve or the connected ductwork. Furthermore, automatic cleaning devices can only spray one type of cleaning agent, resulting in poor cleaning effectiveness inside the hood, indicating room for improvement.

[0039] To address the aforementioned technical problems, this application provides a range hood that can clean not only the interior of the hood but also the check valve and the flue pipe connected to the check valve, thereby increasing the cleaning range and improving the user experience. Furthermore, it can select a suitable cleaning method based on the degree of grease buildup inside the hood, automatically spraying at least one cleaning consumable to avoid the time-consuming and laborious problem of manual cleaning and improve the cleaning effect, thus enhancing the user experience. The specific details of the range hood are further described below with reference to the accompanying drawings.

[0040] Figure 1 The present application shows a schematic diagram of the structure of the range hood 10 in one or more embodiments. Figure 2 It shows Figure 1 Another structural diagram from the perspective of Figure 3 It shows Figure 1 A schematic diagram of the explosion. Combined with... Figures 1-3 The range hood 10 includes a body 100, a fan 200 and a check valve 300. The fan 200 is installed inside the body 100. The body 100 is provided with an exhaust port 101. The range hood 10 is connected to the flue pipe (not shown) through the check valve 300.

[0041] Combination Figures 1-3 The check valve 300 of this application includes a valve body 301 and a valve plate 302. The valve body 301 has a through exhaust channel 303, which connects to the exhaust port 101. The valve plate 302 is connected to the valve body 301 to open or close the exhaust channel 303. When the fan 200 in the range hood 10 is not running or is running at low speed, the valve plate 302 closes the exhaust channel 303. When the fan 200 in the range hood 10 is running at high speed, the valve plate 302 is activated by the airflow in the exhaust channel 303 to open the exhaust channel 303.

[0042] Figure 4 A schematic diagram of the check valve 300 is shown. Figure 5 It shows Figure 4 A structural diagram from another perspective. Combined with... Figure 4 as well as Figure 5 The exhaust duct 303 has spray holes 304 on the side wall of the air inlet end. When the check valve 300 closes the exhaust duct 303, the cleaning medium is sprayed out from the spray holes 304 to clean the inside of the unit 100. When the check valve 300 opens the exhaust duct 303, the cleaning medium is sprayed out from the spray holes 304 to clean the check valve 300 and the flue pipe connected to the check valve 300. This expands the spray range of the cleaning medium, which can not only clean the inside of the range hood 10, but also clean the check valve 300 and the flue pipe connected to the check valve 300, achieving the effects of oil removal and odor removal. This improves the cleaning effect of the range hood, enhances the user experience, and has good practicality.

[0043] Combination Figures 1-4 The top of the body 100 is provided with a groove 102, and the bottom of the groove 102 is provided with an exhaust port 101. The valve body 301 includes a connecting part 305, which is adapted to be disposed in the groove 102. The connecting part 305 is connected to the bottom of the groove 102 by screws and / or adhesive to realize the assembly of the check valve 300 on the body 100.

[0044] Combination Figure 4 as well as Figure 5 The connecting part 305 can be square, and a connecting port 306 is provided inside the connecting part 305. The connecting port 306 of the connecting part 305 serves as the air inlet of the exhaust channel 303. The connecting port 306 is connected to the exhaust port 101 at the bottom of the groove 102 so that the inside of the body 100 is connected to the exhaust channel 303 of the check valve 300.

[0045] Combination Figure 4 as well as Figure 5 The connecting part 305 has a certain thickness and a first spray chamber is built into it, so that the first spray chamber can have a certain capacity to store the intermediate cleaning medium. The spray hole 304 includes a first spray hole 3041, which is located on the side of the valve plate 302 facing the air inlet end of the exhaust channel 303. The first spray hole 3041 is disposed on the inner side of the connecting part 305, that is, the first spray hole 3041 is disposed on the inner wall of the connecting port 306. The first spray hole 3041 is connected to the first spray chamber. When the range hood needs to be cleaned, the cleaning medium stored in the first spray chamber can be sprayed out from the first spray hole 3041 to clean the inside of the machine body 100 when the valve plate 302 of the check valve 300 closes the exhaust channel 303, and to clean the check valve 300 and the flue pipe connected to the check valve 300 when the valve plate 302 of the check valve 300 opens the exhaust channel 303.

[0046] Figure 6 It shows Figure 4 A frontal view diagram, Figure 7 It shows Figure 6 A magnified diagram of point A. Combined with... Figure 7 In some embodiments, the water outlet of the first spray hole 3041 faces the valve plate 302, that is, the water outlet of the first spray hole 3041 is set obliquely upward. With this configuration, when the valve plate 302 of the check valve 300 opens the exhaust channel 303, the cleaning medium sprayed by the first spray hole 3041 can be sprayed upward, thereby extending the spray path of the cleaning medium sprayed by the first spray hole 3041 in the check valve 300 and the flue pipe connected to the check valve 300 to a certain extent, thus improving the cleaning effect on the check valve 300 and the flue pipe connected to the check valve 300, and having good practicality. Specifically, the inclination angle of the water outlet of the first spray hole 3041 can be between 30-60°, for example, 30°, 45°, or 60°.

[0047] Combination Figure 4 as well as Figure 5 The inner wall of the connecting port 306 is provided with a plurality of first spray holes 3041 at intervals. That is, a plurality of first spray holes 3041 are provided circumferentially around the exhaust channel 303 to ensure the amount of cleaning medium sprayed by the first spray holes 3041, and to enable the cleaning medium to be sprayed evenly into the check valve 300 and the flue pipe connected to the check valve 300, thereby improving the cleaning effect.

[0048] Additionally, it should be noted that although the water outlet of the first spray hole 3041 is angled upward, when the valve plate 302 of the check valve 300 closes the exhaust channel 303, the cleaning medium sprayed from the water outlet of the first spray hole 3041 will be blocked by the valve plate 302 and fall into the inside of the range hood, thereby cleaning the inside of the range hood.

[0049] Combination Figure 4 as well as Figure 5 In some embodiments, the spray hole 304 includes a second spray hole 3042. The second spray hole 3042 is provided on the side wall of the air inlet end of the exhaust channel 303, and is located on the side of the valve plate 302 facing the air inlet end of the exhaust channel 303. Correspondingly, the connecting part 305 also has a built-in second spray chamber, so that the second spray chamber can have a certain capacity to store the intermediate cleaning medium. The second spray hole 3042 is provided on the inner side of the connecting part 305, that is, the second spray hole 3042 is provided on the inner wall of the connecting port 306. The second spray hole 3042 is connected to the second spray chamber. When the range hood needs to be cleaned, the cleaning medium stored in the second spray chamber can be sprayed out from the second spray hole 3042.

[0050] Combination Figure 7The second spray hole 3042 is located on the side of the valve plate 302 facing the air inlet end of the exhaust channel 303, that is, the water outlet end of the second spray hole 3042 is set obliquely downward. With this configuration, when the valve plate 302 of the check valve 300 closes the exhaust channel 303, the second spray hole 3042 sprays cleaning medium into the machine body 100, ensuring the amount of cleaning medium sprayed within the machine body 100 and guaranteeing the cleaning effect on the inside of the range hood. When the valve plate 302 of the check valve 300 opens the exhaust channel 303, under the action of airflow, the cleaning medium sprayed by the second spray hole 3042 will also be sprayed into the check valve 300 and the flue pipe connected to the check valve 300, improving the cleaning effect on the check valve 300 and the flue pipe connected to the check valve 300, and has good practicality. Specifically, the angle of the water outlet of the second spray hole 3042 can be between 30 and 60°, for example, it can be 30°, 45° or 60°, etc., and this application does not limit it.

[0051] Combination Figure 4 as well as Figure 5 The first spray hole 3041 is disposed between the second spray hole 3042 and the valve plate 302, that is, the first spray hole 3041 is disposed above the second spray hole 3042. Since the water outlet end of the first spray hole 3041 is set obliquely downward and the second water outlet end is set obliquely upward, the spray directions of the first spray hole 3041 and the second spray hole 3042 can be arranged in opposite directions.

[0052] Combination Figure 4 as well as Figure 5 The inner wall of the connecting port 306 is provided with a plurality of second spray holes 3042 at intervals. That is, a plurality of second spray holes 3042 are provided circumferentially around the exhaust channel 303 to ensure the amount of cleaning medium sprayed by the second spray holes 3042, and to ensure that the cleaning medium is evenly sprayed into the range hood, the check valve 300 and the flue pipe connected to the check valve 300, thereby improving the cleaning effect.

[0053] Figure 8 A schematic diagram of the water circuit for the range hood 10 is shown. (Combined with...) Figure 8 The range hood 10 also includes a heater 400 and a first pump body 500. The heater 400 is connected to the spray hole 304 through the first pump body 500. That is, the cleaning medium can be heated by the heater 400, and the heated cleaning medium cleans the inside of the machine body 100, the check valve 300, and the flue, improving the cleaning effect. In specific implementation, the heater 400 can be a steam generator, and the heated cleaning medium can be cleaning water. The cleaning water is heated by the heater 400 to generate steam, and the steam softens the grease inside the machine body 100, the check valve 300, and the flue, improving the cleaning effect on the machine body 100, the check valve 300, and the flue.

[0054] Combination Figure 8The range hood 10 also includes a washing box 600 and a second pump body 700. The washing box 600 is used to store detergent, and the washing box 600 is connected to the spray hole 304 through the second pump body 700. Under the action of the second pump body 700, the detergent in the washing box 600 can be pumped into the connecting part 305, and sprayed into the body 100, the check valve 300, and the inside of the flue through the spray hole 304, thereby improving the cleaning effect.

[0055] Combination Figure 8 In one embodiment, the heater 400 is connected to the first spray hole 3041 through the first pump body 500, and the washing box 600 is connected to the second spray hole 3042 through the second pump body 700. That is, the cleaning water heated by the heater 400 is sprayed from the first spray hole 3041, and the detergent in the washing box 600 is sprayed from the second spray hole 3042. The cleaning water and detergent are sprayed out separately. By controlling the working sequence of the first pump body 500 and the second pump body 700, different cleaning modes can be formed. For example, cleaning water is delivered first, and the steam after heating the cleaning water can soften the oil stains in the machine body 100. Then, detergent is delivered, and the heated detergent can decompose the oil stains in the machine body 100. Or, for example, detergent is delivered first, and the heated detergent can decompose the oil stains in the machine body 100. Then, cleaning water is delivered, and the steam after heating the cleaning water can soften the oil stains in the machine body 100. In this way, multiple cleaning modes can be formed to adapt to different oil stain concentrations in the machine body 100, the check valve 300, and the inside of the flue.

[0056] Combination Figure 4 The check valve 300 also includes a first connecting pipe 307 and a second connecting pipe 308. The first connecting pipe 307 is connected to the first pump body 500. The cleaning medium heated by the heater 400 is transported through the first connecting pipe 307 to the first storage chamber in the connecting part 305 and sprayed from the first spray hole 3041. The second connecting pipe 308 is connected to the second pump body 700. The cleaning medium in the washing box 600 is transported through the second connecting pipe 308 to the second storage chamber in the connecting part 305 and sprayed from the second spray hole 3042.

[0057] Figure 9 A schematic diagram of the water circuit for the range hood 10 is shown. (Combined with...) Figure 9 In another embodiment, the heater 400 is simultaneously connected to the first spray hole 3041 and the second spray hole 3042 through the first pump body 500, and the washing box 600 is connected to the first spray hole 3041 and the second spray hole 3042 through the second pump body 700. That is, the cleaning water and detergent heated by the heater 400 are sprayed simultaneously from the first spray hole 3041 and the second spray hole 3042. Different cleaning modes can also be formed by controlling the working sequence of the first pump body 500 and the second pump body 700.

[0058] It should be noted that this application can achieve arbitrary mixing of two or more cleaning media by adjusting the delivery flow rate and timing of the first pump body 500 and the second pump body 700 to cope with different oil stain scenarios. For example, in light oil stain scenarios, the proportion of detergent is slightly smaller, and in heavy oil stain scenarios, the proportion of detergent is slightly larger. In addition, in some light oil stain scenarios, the cleaning media can be cleaned without heating, and the cleaning media at room temperature can be used to clean the inside of the machine body 100, the check valve 300, and the flue pipe.

[0059] Furthermore, different cleaning modes can be selected by the user. For example, the cleaning mode option can be set on the control panel of the range hood 10 or on the control terminal connected to the range hood 10, allowing the user to actively select the cleaning mode; or / and, at least one of the body 100, the check valve 300, and the smoke pipe is equipped with an oil fume concentration detector. The oil fume concentration detector can obtain the oil fume concentration inside the body 100, the check valve 300, and the smoke pipe. When the user needs to clean the range hood 10, the controller of the range hood 10 automatically selects a cleaning mode that matches the oil fume concentration based on the obtained oil fume concentration of at least one of the body 100, the check valve 300, and the smoke pipe; or, based on the running time of the range hood 10, the degree of oil accumulation is judged, and a cleaning mode that matches the oil fume concentration is automatically selected. This application does not impose any limitations on this.

[0060] In another embodiment, the heater 400, the first pump body 500, the washing box 600, and the second pump body 700 may be disposed on the top of the body 100 to shorten the piping connection. In another embodiment, the heater 400, the first pump body 500, the washing box 600, and the second pump body 700 may also be arranged in other locations of the body 100, and this application does not impose any limitations on this.

[0061] Based on the same design concept, this application also provides a cleaning method for a range hood 10, the cleaning method comprising:

[0062] When the check valve 300 closes the exhaust channel 303, the cleaning medium is sprayed out from the spray hole 304 to clean the inside of the machine body 100; when the check valve 300 opens the exhaust channel 303, the cleaning medium is sprayed out from the spray hole 304 to clean the check valve 300 and the flue pipe connected to the check valve 300.

[0063] The check valve 300, range hood 10, and cleaning method provided in this application are characterized by a through exhaust channel 303 in the valve body 301 of the check valve 300, with a valve plate 302 connected to the valve body 301. When the fan 200 in the range hood 10 is not running or is running at low speed, the valve plate 302 closes the exhaust channel 303. When the fan 200 in the range hood 10 is running at high speed, the valve plate 302 is activated by the airflow in the exhaust channel 303 to open the exhaust channel 303. When the check valve 300 closes the exhaust channel 303, the cleaning medium is sprayed out from the spray hole 304 to clean the inside of the machine body 100; when the check valve 300 opens the exhaust channel 303, the cleaning medium is sprayed out from the spray hole 304 to clean the check valve 300 and the flue pipe connected to the check valve 300, thereby expanding the spray range of the cleaning medium. It can not only clean the inside of the range hood 10, but also clean the check valve 300 and the flue pipe connected to the check valve 300, achieving the effects of oil removal and odor removal, thereby improving the cleaning effect of the range hood, improving the user experience, and having good practicality.

[0064] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0066] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0067] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0068] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A check valve, characterized in that, The check valve includes: The valve body is provided with a through exhaust channel, and the side wall of the air inlet end of the exhaust channel is provided with spray holes. A valve plate, connected to the valve body, for opening or closing the exhaust duct; The spray nozzle is located on the side of the valve plate facing the air inlet end of the exhaust channel.

2. The check valve according to claim 1, characterized in that, The spray hole includes a first spray hole, the water outlet of which faces the valve plate.

3. The check valve according to claim 2, characterized in that, The spray hole includes a second spray hole, which is located on the side of the valve plate facing the air inlet end of the exhaust channel.

4. The check valve according to claim 3, characterized in that, The water outlet of the second spray hole is positioned away from the valve plate.

5. The check valve according to claim 3, characterized in that, The first spray hole is arranged in multiple circumferentially around the exhaust channel, and the second spray hole is arranged in multiple circumferentially around the exhaust channel.

6. The check valve according to claim 5, characterized in that, The first spray hole is disposed between the second spray hole and the valve plate.

7. The check valve according to claim 3, characterized in that, The valve body is provided with a first spray chamber and a second spray chamber, the first spray chamber is connected to the first spray hole, and the second spray chamber is connected to the second spray hole.

8. A range hood, characterized in that, The range hood includes: The main body is equipped with an exhaust vent; The check valve according to any one of claims 1-7, wherein the check valve is connected to the machine body, and the exhaust channel is connected to the exhaust port.

9. The range hood according to claim 8, characterized in that, The range hood also includes: A heater and a first pump body, wherein the heater is connected to the spray hole through the first pump body.

10. The range hood according to claim 8, characterized in that, The range hood also includes: The washing box is used to store detergent, and the washing box is connected to the spray nozzle through the second pump body.

11. A method for cleaning a range hood, characterized in that, The cleaning method, applicable to any one of claims 8-10, comprises: With the exhaust duct closed, the cleaning medium is sprayed from the spray holes to clean the inside of the machine body; When the exhaust duct is open, the cleaning medium is sprayed from the spray hole to clean the check valve and the flue pipe connected to the check valve.

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