CN115127131A - Range hood capable of selecting air exhaust - Google Patents

Abstract

The invention discloses a range hood capable of selecting air exhaust, which comprises: a range hood body having an outer discharge channel and an inner discharge channel; the exhaust control device is arranged on the cigarette machine main body and is used for controlling the opening and closing of the inner exhaust channel and the opening and closing of the outer exhaust channel; the fan device is arranged in the cigarette main body; and the main control module is electrically connected with the air exhaust control device and the fan device respectively. According to the structure, when the range hood is installed, the exhaust control device is driven to operate through the main control module, so that the inner row channel is closed and the outer row channel is opened, or the inner row channel is opened and the outer row channel is closed, the range hood does not need to be disassembled for adjustment, and the range hood is convenient to install; when the range hood is installed and a user needs to switch exhaust, the exhaust control device can be driven to operate again through the main control module, so that the user can conveniently switch the exhaust mode.

Description

Range hood capable of selecting air exhaust

Technical Field

The invention relates to the technical field of kitchen electricity, in particular to a range hood.

Background

In the prior art, some range hoods have an inner exhaust channel for exhausting air indoors and an outer exhaust channel for exhausting air outdoors, so as to meet the requirements of outer exhaust and inner exhaust of air. Before the range hood is installed, a user can select inner discharge or outer discharge according to conditions, then the range hood is disassembled, and a wind shield is installed in the range hood to seal a channel which does not need to exhaust; when the exhaust needs to be switched later, the range hood also needs to be disassembled to reinstall the wind shield. The operation of disassembling the range hood and installing the wind shield is tedious, so that the operation of installing the range hood and switching exhaust is inconvenient.

Disclosure of Invention

The invention aims to provide a range hood capable of selecting air exhaust, which can solve the following problems: the installation of the range hood and the operation of switching exhaust are inconvenient.

In order to achieve the above object, a range hood capable of selecting exhaust is provided, which comprises: a range hood body having an outer discharge channel and an inner discharge channel; the exhaust control device is arranged on the cigarette machine main body and is used for respectively controlling the opening and closing of the inner exhaust channel and the opening and closing of the outer exhaust channel; the fan device is arranged in the cigarette main body; and the main control module is electrically connected with the air exhaust control device and the fan device respectively.

According to the range hood capable of exhausting air selectively, the exhaust control device comprises a first control mechanism and a second control mechanism, the first control mechanism is used for controlling the opening and closing of the outer exhaust channel, and the second control mechanism is used for controlling the opening and closing of the inner exhaust channel.

According to the range hood capable of exhausting air selectively, the first control mechanism comprises: the first mounting frame is connected with the cigarette machine main body; the first motor is arranged on the first mounting frame and is electrically connected with the main control module; the first middle connecting piece is connected with a rotating shaft of the first motor and is provided with a first outer row stop part and a second outer row stop part on the side surface; a first baffle plate located at an end of or within the outer row channel; the first connecting rod is respectively connected with the first middle connecting piece and the first baffle; the first limiting part is arranged on the first mounting frame or the shell of the first motor; one end of the tension spring piece is connected with the second outer row stopping part, and the other end of the tension spring piece is connected with the first mounting frame or the shell of the first motor; when the first outer-row stopping part moves to one side abutting against the first limiting part, the first baffle is located at a position closing the outer-row channel.

According to the range hood capable of exhausting air selectively, the range hood main body comprises: the bottom of the box shell is provided with a first mounting port, and the top of the box shell is provided with the outer discharge channel; the top of the volute is open and is connected with the inner top wall of the box shell, so that the volute and the inner top wall of the box shell form an air cavity communicated with the outer discharge channel, and the bottom of the volute is provided with an air inlet; the housing is arranged on one side of the volute and forms an air channel with the inner wall of the box shell in an enclosing mode; the inner row of channels comprise a first air outlet arranged on the side wall of the volute, a second air outlet arranged on the surface of the casing of the box body and the air duct, and the first air outlet, the air duct and the second air outlet are communicated in sequence.

According to the range hood capable of selectively exhausting air, the bottom of the volute is provided with two air inlets, a partition plate positioned between the two air inlets is arranged in the volute, the partition plate is positioned below the inlet end of the outer discharge channel and at the first air outlet and divides the inner cavity of the volute into two installation cavities, and each installation cavity is correspondingly provided with a fan device; when the first baffle is displaced to abut against the side wall of the partition, the first baffle is in a position to open the outer row of channels.

According to the range hood capable of exhausting air selectively, the second control mechanism comprises: the second motor is arranged on the volute and/or the housing and is electrically connected with the main control module; the second middle connecting piece is connected with a rotating shaft of the second motor, and an inner row stopping part is arranged on the side surface of the second middle connecting piece; the second baffle is positioned at the first air outlet; the second connecting rod is respectively connected with the second middle connecting piece and the second baffle; the second limiting part is arranged on a shell or a volute or a housing of the second motor; when the inner row stopping part moves to one side abutting against the second limiting part, the second baffle is positioned at a position for closing the inner row channel; when the second baffle moves to abut against the side wall of the baffle or the inner-row stopping part moves to abut against one side of a third limiting part, the second baffle is in a position for opening the inner-row channel; the third limiting part is arranged on a shell or a volute or a housing of the second motor.

According to the range hood capable of exhausting air selectively, the bottom of the box shell is provided with the oil collecting box, the air inlet is arranged below the volute and provided with the oil guide ring, the top surface of the oil guide ring is concavely provided with the oil guide groove arranged along the edge of the air inlet, the bottom of the volute is provided with the second skirt part connected to the edge of the air inlet and extending downwards, and the oil guide channel is arranged between the oil guide groove and the oil collecting box.

According to the range hood capable of exhausting air selectively, the outer side of the volute is provided with the electric heating structure.

According to the range hood capable of exhausting air selectively, the fan device is located in the air cavity and comprises a motor assembly and a wind wheel, the motor assembly is connected with the box shell and the wind wheel respectively, the axis of the wind wheel is arranged vertically, the wind wheel is located above the air inlet, the wind wheel is provided with a top ring, a cross-flow blade and a bottom ring which are sequentially arranged from top to bottom, and longitudinal projections of the cross-flow blade and the bottom ring are located in a longitudinal projection of the oil guide groove.

According to the range hood capable of exhausting air selectively, the oil guide channel comprises: the oil guide port is formed in the bottom surface of the oil guide groove; the mounting pipe is fixedly connected with the oil guide ring, and the inner cavity of the oil guide pipe is communicated with the oil guide port; and the oil guide pipe, one end of the oil guide pipe is sleeved with the mounting pipe, the other end of the oil guide pipe extends to the upper part of a groove strip, the groove strip is arranged above the oil collecting box and connected with the box shell, and the bottom surface of the inner cavity of the groove strip is provided with an oil dropping hole.

Has the beneficial effects that: according to the structure, when the range hood is installed, the exhaust control device is driven to operate through the main control module, so that the inner row channel is closed and the outer row channel is opened, or the inner row channel is opened and the outer row channel is closed, the range hood does not need to be disassembled for adjustment, and the range hood is convenient to install; when the range hood is installed and a user needs to switch exhaust, the exhaust control device can be driven to operate again through the main control module, so that the user can conveniently switch the exhaust mode.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention is further described below with reference to the accompanying drawings and examples;

FIG. 1 is a block diagram of an embodiment of the present invention;

FIG. 2 is an exploded cross-sectional view of an embodiment of the present invention;

FIG. 3 is a side cross-sectional view of an embodiment of the invention;

FIG. 4 is an exploded view of the first control mechanism;

FIG. 5 is a schematic diagram of a portion of the structure of an embodiment of the present invention;

FIG. 6 is an exploded cross-sectional view of a portion of the structure of an embodiment of the present invention;

FIG. 7 is a cross-sectional view of the volute and oil-guiding passage;

fig. 8 is an enlarged view of a portion a shown in fig. 7;

FIG. 9 is a schematic view of the fan assembly in cooperation with an oil control ring;

fig. 10 is a schematic circuit diagram of the present invention.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, greater than, less than, exceeding, etc. are understood as excluding the present numbers, and the above, below, inside, etc. are understood as including the present numbers. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 to 10, a range hood with optional air discharge comprises a range hood main body 10, an air discharge control device, a fan device 40 and a main control module 50. The cigarette machine main body 10 is hollow, an outer exhaust channel 61 and an inner exhaust channel 62 are arranged on the cigarette machine main body 10, an exhaust control device is arranged on the cigarette machine main body 10 and used for respectively controlling the opening and closing of the inner exhaust channel 62 and the opening and closing of the outer exhaust channel 61, the fan device 40 is arranged in the cigarette machine main body 10, and the main control module 50 is respectively electrically connected with the exhaust control device and the fan device 40.

According to the structure, when the range hood is installed, the exhaust control device is driven to operate through the main control module 50, so that the inner exhaust channel 62 is closed and the outer exhaust channel 61 is opened, or the inner exhaust channel 62 is opened and the outer exhaust channel 61 is closed, the range hood does not need to be disassembled for adjustment, and the range hood is convenient to install. In addition, when the range hood is installed and a user needs to switch exhaust, the exhaust control device can be driven to operate again through the main control module 50, so that the user can conveniently switch the exhaust mode. Wherein, the exhaust control device controls the opening and closing of the inner discharge channel 62 and the opening and closing of the outer discharge channel 61 respectively, so that the opening and closing of the inner discharge channel 62 and the opening and closing of the outer discharge channel 61 can be independently carried out, the two channels do not interfere, and the installation and the adjustment of switching exhaust are convenient.

In this embodiment, the cigarette machine main body 10 includes the box shell 11, the volute 12 and the housing 13, a first mounting opening has been seted up to the bottom of box shell 11, be provided with the filter screen 14 in the first mounting opening, the top of box shell 11 is provided with foretell outer discharge passage 61, the volute 12 is located box shell 11, the uncovered inside roof of connecting box shell 11 in top of volute 12 to make the inside roof of volute 12 and box shell 11 enclose into the wind cavity 15 of intercommunication outer discharge passage 61, the air intake 121 has been seted up to the bottom of volute 12, the housing 13 sets up in one side of volute 12, and enclose into wind channel 622 between the inner wall of the box shell 11 of housing 13. The inner channel 62 includes a first air outlet 621 formed in a side wall of the volute 12, a second air outlet 623 formed in a surface of the casing 11, and an air duct 622, and the first air outlet 621, the air duct 622, and the second air outlet 623 are sequentially connected to each other.

In this embodiment, two air inlets 121 are opened at the bottom of the volute 12, and a partition 16 located between the two air inlets 121 is provided in the volute 12, the partition 16 is located below the inlet end of the outer discharge passage 61 and at the first air outlet 621, the partition 16 partitions the inner cavity of the volute 12 into two installation cavities, a fan device 40 is correspondingly provided in each installation cavity, the tops of the two installation cavities are all communicated with the outer discharge passage 61, and the lateral portions of the two installation cavities are all communicated with the first air outlet 621. The range hood can be set to enable the two fan devices 40 to alternatively operate or operate together, and when the two fan devices are alternatively operated, the range hood can play a role in guiding air through the partition plate 16, so that airflow is prevented from entering an installation cavity where the fan devices 40 which are not operated are located; when operated together, the baffle 16 prevents the air streams generated by the two fan assemblies 40 from mixing and interfering with the flow of flue gas in the volute 12.

In this embodiment, the exhaust control device includes a first control mechanism 20 and a second control mechanism 30, the first control mechanism 20 is used for controlling the opening and closing of the outer discharge channel 61, and the second control mechanism 30 is used for controlling the opening and closing of the inner discharge channel 62.

The first control mechanism 20 includes a first mounting frame 21, a first motor 22, a first middle connector 23, a first baffle 24, a first connecting rod 25, a first limiting portion 26 and a tension spring 27, the first mounting frame 21 is connected with the box body 11, the first motor 22 is disposed on the first mounting frame 21 and electrically connected to the main control module 50, the first middle connector 23 is connected to a rotating shaft of the first motor 22, a first outer row stopper 231 and a second outer row stopper 232 are disposed on a side surface of the first middle connector 23, the first baffle 24 is located in the outer row channel 61, the first connecting rod 25 is connected to the first middle connector 23 and the first baffle 24, the first limiting portion 26 is disposed on a housing of the first motor 22, one end of the tension spring 27 is connected to the second outer row stopper 232, and the other end is connected to the housing of the first motor 22. When the first baffle 24 is displaced against the sidewall of the baffle 16, the first baffle 24 is in a position to open the outer row of channels 61; when the first outer-row stopper 231 is displaced to abut against one side of the first stopper 26, the first shutter 24 is in a position to close the outer-row channel 61.

Taking the first baffle 24 at the initial position to close the outer discharge channel 61 as an example, when the main control module 50 controls the first motor 22 to be powered on, the first middle connecting piece 23 and the first baffle 24 can be driven to rotate forward, the first outer discharge stopping part 231 and the second outer discharge stopping part 232 can also rotate and displace along with the first middle connecting piece 23 and the first baffle 24, when the first baffle 24 rotates to a position of stopping against the side wall of the partition 16, the first middle connecting piece 23 and the first baffle 24 are limited in displacement and stop rotating, at this time, the first baffle 24 is at a position of being rotated and opened to completely open the outer discharge channel 61, and the tension spring 27 stretches and stores force; when the first motor 22 is powered off, the tension spring 27 pulls the first middle connecting piece 23 and the first blocking plate 24 to rotate reversely, when the first outer row stopping part 231 stops against one side of the first limiting part 26, the first middle connecting piece 23 is limited in displacement and stops rotating, and at the moment, the first blocking plate 24 is in a position of rotating and resetting to block the outer row channel 61. With the structure, the first baffle plate 24 can be accurately stopped at the position for opening and closing the outer discharge channel 61, so that the exhaust is convenient and the external gas is prevented from flowing backwards through the outer discharge channel 61; and the position of the first baffle plate 24 can be detected without arranging a limit switch and the like, so that the structure is simplified.

In some embodiments, the first baffle 24 may also be located at the end of the outer row of channels 61. In addition, the first position-limiting portion 26 may be disposed on the first mounting frame 21, and the other end of the tension spring 27 may also be connected to the first mounting frame 21.

In this embodiment, the second control mechanism 30 includes a second motor 31, a second middle connector 32, a second baffle 33, a second connecting rod 34 and a second limiting portion 35, the second motor 31 is connected to the volute 12 and the housing 13 at the same time, the second motor 31 is electrically connected to the main control module 50, the second middle connector 32 is connected to a rotating shaft of the second motor 31, an inner row stopper 321 is disposed on a side surface of the second middle connector 32, the second baffle 33 is located at the first air outlet 621, the second connecting rod 34 is connected to the second middle connector 32 and the second baffle 33, the second limiting portion 35 is disposed on a housing of the second motor 31, and a third limiting portion 36 is further disposed on the housing of the second motor 31. When the inner-row stopping part 321 is displaced to abut against one side of the second limiting part 35, the second baffle 33 is in a position for closing the inner-row channel 62; when the inner-row stopper 321 is displaced to abut against one side of the third stopper 36, the second shutter 33 is in a position to open the inner-row passage 62.

When the second baffle 33 is located at the initial position, the first outlet 621 can be closed, and the inner channel 62 can be further closed. Taking the second baffle 33 at the initial position to close the inner channel 62 as an example, when the main control module 50 controls the second motor 31 to be powered on, the second middle connector 32 and the second baffle 33 can be driven to rotate forward, the inner stop portion 321 can also rotate and displace along with the second motor, when the inner stop portion 321 rotates to a position of stopping against one side of the third limiting portion 36, the second middle connector 32 and the second baffle 33 are limited in displacement and stop rotating, and at this time, the second baffle 33 is at a position of being rotated and opened to completely open the inner channel 62; when the second motor 31 drives the second middle connector 32 and the second baffle 33 to rotate in opposite directions, the second middle connector 32 and the second baffle 33 rotate in opposite directions, and when the inner row stopper 321 abuts against one side of the second limiting portion 35, the second middle connector 32 is limited in displacement and stops rotating, and at this time, the second baffle 33 is in a position of rotating and resetting to close the inner row channel 62. With the structure, the second baffle 33 can be accurately stopped at the position for opening and closing the inner exhaust channel 62, so that the exhaust is convenient and the external air is prevented from flowing backwards; and the position of the second shutter 33 can be detected without providing a limit switch or the like, so that the structure can be simplified.

In some embodiments, the second motor 31 may be connected to only one of the volute 12 and the housing 13. The second limiting portion 35 and the third limiting portion 36 may also be disposed on the volute 12 or the housing 13.

In some embodiments, the third position-limiting portion 36 may not be provided, wherein when the second shutter 33 is displaced to abut against the side wall of the partition 16, the second intermediate member 32 and the second shutter 33 are displaced and stop rotating, and the second shutter 33 is in a position where it is rotated to be opened to fully open the inner row passage 62.

In this embodiment, the oil collecting box 71 is disposed at the bottom of the box housing 11, the oil guiding ring 72 is disposed below the volute 12 at the air inlet 121, the oil guiding groove 721 disposed along the edge of the air inlet 121 is recessed on the top surface of the oil guiding ring 72, the second skirt portion 122 connected to the edge of the air inlet 121 and extending downward is disposed at the bottom of the volute 12, and the oil guiding channel 73 is disposed between the oil guiding groove 721 and the oil collecting box 71. Like this structure, the greasy dirt in the spiral case 12 flows to air intake 121, then falls to leading in the oil groove 721 along the inner wall of second skirt portion 122, collects in leading oil channel 73 with greasy dirt water conservancy diversion to collection oil box 71, so can avoid the greasy dirt in the spiral case 12 to flow to positions such as filter screen 14 and cause the inside secondary pollution of range hood, has reduced the clear work load of user, has optimized user's use and has experienced.

In this embodiment, the oil guiding channel 73 includes an oil guiding port 731, a mounting tube 732 and an oil guiding tube 733, the oil guiding port 731 is disposed on the bottom surface of the oil guiding groove 721, the mounting tube 732 is fixedly connected to the oil guiding ring 72, an inner cavity of the oil guiding tube 733 is communicated with the oil guiding port 731, one end of the oil guiding tube 733 is sleeved with the mounting tube 732, the other end of the oil guiding tube 733 extends to the upper side of a groove bar 734, the groove bar 734 is located above the oil collecting box 71 and connected to the box shell 11, and an oil dropping hole 7341 is disposed on the bottom surface of the inner cavity of the groove bar 734. The oil in the oil guiding groove 721 flows through the oil guiding opening 731, the mounting pipe 732, the oil guiding pipe 733 and the channel 734 in sequence, and finally flows into the oil collecting box 71.

In some embodiments, the oil conduit 733 may be directly inserted into the oil guide opening 731.

In the present embodiment, an electric heating structure is provided on the outer side surface of the scroll casing 12. Wherein, the electric heating structure can be arranged as an electric heating plate, an electric heating wire and the like. When the inside of the volute 12 needs to be cleaned, the volute 12 is heated by the electric heating structure, so that the condensed oil inside the volute 12 is melted, and the oil stain formed by melting can flow to the oil guide groove 721 and is finally collected by the oil collection box 71.

In this embodiment, the fan device 40 includes a motor assembly 41 and a wind wheel 42, the motor assembly 41 is respectively connected to the box housing 11 and the wind wheel 42, and the motor assembly 41 is electrically connected to the main control module 50, an axis of the wind wheel 42 is vertically arranged, the wind wheel 42 has a top ring 43, a cross-flow blade 44 and a bottom ring 45 which are sequentially arranged from top to bottom, the cross-flow blade 44 is provided in a plurality and arranged in a ring shape, the cross-flow blade 44 is respectively connected to the top ring 43 and the bottom ring 45, and longitudinal projections of the cross-flow blade 44 and the bottom ring 45 are both located in a longitudinal projection of the oil guide groove 721. In operation, the motor assembly 41 drives the wind wheel 42 to rotate around a vertical axis, smoke passes through the filter screen 14 and the air inlet 121 and enters the air cavity 15, oil stains adhered on the wind wheel 42 are thrown to the inner side wall of the volute 12 and then flow to the oil guide groove 721; the electric heating structure can melt the condensed oil on the wind wheel 42 during heating, and the melted oil stain flows downwards along the cross flow blades 44 and the bottom ring 45 and drops to the oil guide groove 721, so that the oil stain on the wind wheel 42 can be guided and collected to the oil collection box 71. In addition, the motor assembly 41 is connected with the case shell 11, so that the bearing of the volute 12 can be reduced, the structure of the volute 12 is simplified, the volute 12 is easy to manufacture, and the manufacturing cost is low.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (10)

1. A range hood capable of exhausting air selectively is characterized by comprising:

a range hood body having an outer discharge channel and an inner discharge channel;

the exhaust control device is arranged on the cigarette machine main body and is used for respectively controlling the opening and closing of the inner exhaust channel and the opening and closing of the outer exhaust channel;

the fan device is arranged in the cigarette main body;

and the main control module is electrically connected with the air exhaust control device and the fan device respectively.

2. The range hood capable of selecting air exhaust according to claim 1, wherein the air exhaust control device comprises a first control mechanism and a second control mechanism, the first control mechanism is used for controlling the opening and closing of the outer exhaust channel, and the second control mechanism is used for controlling the opening and closing of the inner exhaust channel.

3. The range hood with selectable air discharge according to claim 2, wherein the first control mechanism comprises:

the first mounting frame is connected with the cigarette machine main body;

the first motor is arranged on the first mounting frame and is electrically connected with the main control module;

the first middle connecting piece is connected with a rotating shaft of the first motor and is provided with a first outer row stop part and a second outer row stop part on the side surface;

a first baffle plate located at an end of or within the outer row channel;

the first connecting rod is respectively connected with the first middle connecting piece and the first baffle;

the first limiting part is arranged on the first mounting frame or the shell of the first motor;

one end of the tension spring piece is connected with the second outer row stopping part, and the other end of the tension spring piece is connected with the first mounting frame or the shell of the first motor;

when the first outer-row stopping part moves to one side abutting against the first limiting part, the first baffle is located at a position closing the outer-row channel.

4. The range hood capable of selecting exhaust air according to claim 3, wherein the range hood main body comprises:

the bottom of the box shell is provided with a first mounting port, and the top of the box shell is provided with the outer discharge channel;

the top of the volute is open and is connected with the inner top wall of the box shell, so that the volute and the inner top wall of the box shell form an air cavity communicated with the outer discharge channel, and the bottom of the volute is provided with an air inlet;

the housing is arranged on one side of the volute and forms an air channel with the inner wall of the box shell in an enclosing manner;

the inner row of channels comprise a first air outlet arranged on the side wall of the volute, a second air outlet arranged on the surface of the casing of the box body and the air duct, and the first air outlet, the air duct and the second air outlet are communicated in sequence.

5. The range hood capable of selecting air exhaust according to claim 4, wherein the bottom of the volute is provided with two air inlets, a partition plate is arranged in the volute and positioned between the two air inlets, the partition plate is positioned below the inlet end of the outer discharge channel and at the first air outlet and divides the inner cavity of the volute into two installation cavities, and each installation cavity is correspondingly provided with a fan device;

when the first baffle is displaced to abut against the side wall of the partition, the first baffle is in a position to open the outer row of channels.

6. The range hood with selectable air discharge according to claim 5, wherein the second control mechanism comprises:

the second motor is arranged on the volute and/or the housing and is electrically connected with the main control module;

the second middle connecting piece is connected with a rotating shaft of the second motor and is provided with an inner row stopping part on the side surface;

the second baffle is positioned at the first air outlet;

the second connecting rod is respectively connected with the second middle connecting piece and the second baffle;

the second limiting part is arranged on a shell or a volute or a housing of the second motor;

when the inner-row stopping part moves to one side of the second limiting part, the second baffle is in a position for closing the inner-row channel;

when the second baffle plate moves to abut against the side wall of the baffle plate or the inner row stopping part moves to abut against one side of a third limiting part, the second baffle plate is positioned at a position for opening the inner row channel;

the third limiting part is arranged on a shell or a volute or a housing of the second motor.

7. The range hood capable of exhausting air selectively according to claim 4, wherein an oil collecting box is disposed at the bottom of the casing, an oil guiding ring is disposed below the volute at the air inlet, an oil guiding groove is recessed on the top surface of the oil guiding ring and is disposed along the edge of the air inlet, a second skirt portion is disposed at the bottom of the volute and is connected to the edge of the air inlet and extends downward, and an oil guiding channel is disposed between the oil guiding groove and the oil collecting box.

8. An exhaust-selectable range hood as set forth in claim 7 wherein an electric heating structure is disposed outside said volute.

9. The range hood capable of selecting exhaust air according to claim 8, wherein the fan device is located in the air cavity and comprises a motor assembly and a wind wheel, the motor assembly is respectively connected with the box shell and the wind wheel, the axis of the wind wheel is vertically arranged, the wind wheel is located above the air inlet, the wind wheel is provided with a top ring, a cross-flow blade and a bottom ring which are sequentially arranged from top to bottom, and the longitudinal projections of the cross-flow blade and the bottom ring are located in the longitudinal projection of the oil guide groove.

10. The range hood with optional exhaust of claim 7, wherein the oil guide channel comprises:

the oil guide port is formed in the bottom surface of the oil guide groove;

the mounting pipe is fixedly connected with the oil guide ring, and the inner cavity of the oil guide pipe is communicated with the oil guide port;

and the oil guide pipe, one end of the oil guide pipe is sleeved with the mounting pipe, the other end of the oil guide pipe extends to the upper part of a groove strip, the groove strip is arranged above the oil collecting box and connected with the box shell, and the bottom surface of the inner cavity of the groove strip is provided with an oil falling hole.

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