A smoke collecting structure of a range hood and a range hood

Abstract

The application discloses a smoke collecting structure of an oil fume extractor and the oil fume extractor. The smoke collecting structure comprises a smoke collecting cover, a smoke collecting cavity is arranged in the smoke collecting cover, at least one telescopic body capable of being telescopically extended outwards or telescopically retracted inwards relative to the smoke collecting cavity is arranged on the smoke collecting cover, and the telescopic body is used for changing the volume of the smoke collecting cavity. The volume of the smoke collecting cavity can be changed by arranging the telescopic body capable of being telescopically extended outwards or telescopically retracted inwards relative to the smoke collecting cavity on the smoke collecting cover, and the application range of the oil fume extractor is enlarged. The application further provides an oil fume extractor which comprises a machine box and further comprises the smoke collecting structure of the oil fume extractor arranged at the bottom of the machine box.

Description

Technical Field

[0001] This invention belongs to the field of kitchen appliance technology, specifically, it relates to a smoke collection structure and a range hood. Background Technology

[0002] A top-mounted range hood typically includes a smoke collection hood and a casing located above the smoke collection hood. The casing of the range hood has air ducts that connect to the outside and the inside of the smoke collection hood. The air ducts contain a fan system, which includes a fan, a fan housing, and a motor. The oil fumes generated during cooking are collected by the smoke collection hood under the power of the fan system and enter the smoke collection hood through the air inlet.

[0003] Traditional range hoods have relatively fixed smoke collection hood dimensions, which can only meet the installation requirements of traditional kitchens. With the rise of apartment housing, the fixed dimensions of traditional smoke collection hoods can no longer meet the installation requirements of both traditional kitchens and apartment kitchens, thus reducing the applicability of range hoods. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a smoke collection structure and a range hood, so as to change the volume of the smoke collection cavity and increase the applicability of the range hood by providing a retractable body on the smoke collection hood that can extend outward or retract inward relative to the smoke collection cavity.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a smoke collection structure for a range hood, including a smoke collection hood, a smoke collection chamber inside the smoke collection hood, and at least one extendable body on the smoke collection hood that can extend or retract relative to the smoke collection chamber to change the volume of the smoke collection chamber.

[0007] Furthermore, the smoke hood is square, and there are retractable bodies on both the left and right sides of the smoke hood. The two retractable bodies can extend outward or retract inward at the same time.

[0008] Furthermore, the telescopic body is a strip-shaped plate structure that extends in the front-to-back direction. One side of the telescopic body is attached to the side wall of the smoke hood, and the telescopic body protrudes horizontally outward relative to the side wall of the smoke hood.

[0009] Furthermore, one side of the telescopic body is fitted to the lower edge of the side wall of the smoke hood.

[0010] Furthermore, the smoke hood is equipped with a cylinder, which includes a cylinder housing and a piston rod partially embedded in the cylinder housing. The piston rod is connected to a telescopic body.

[0011] Furthermore, the piston rod includes a first section extending horizontally to drive the telescopic body to extend and retract horizontally, and a second section extending vertically to drive the telescopic body to extend and retract vertically, the second section being connected to the telescopic body.

[0012] Furthermore, the retractable body includes a first retractable body and a second retractable body. The first retractable body is gradually inclined upward from back to front, and the second retractable body is gradually inclined downward from back to front. The second rod connects the transition between the first retractable body and the second retractable body.

[0013] Furthermore, the smoke hood is provided with an installation cavity and a smoke collection cavity distributed in the vertical direction. The installation cavity is divided into two independent front installation cavities and a rear installation cavity for installing other components in the front-to-back direction. The rear installation cavity is connected to the smoke collection cavity. The cylinder housing is located in the front installation cavity, and the piston rod extends out of the front installation cavity and is connected to the telescopic body.

[0014] The present invention also provides a range hood, including a casing, and a smoke collection structure of the range hood provided by the above-mentioned technical solution disposed at the bottom of the casing.

[0015] Furthermore, the middle of the rear sidewall of the smoke hood protrudes upward to form a first protrusion. The rear sides of both the left and right sidewalls of the chassis are provided with flanges that fit against the rear sidewall of the chassis. The bottom of the flanges protrudes downward to form a second protrusion 411. Two first insertion slots are provided on the rear sidewall of the smoke hood. The first protrusion fits against the rear sidewall of the chassis, and the second protrusion 411 is embedded in the first insertion slot.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0017] By incorporating a retractable body on the smoke collection hood that extends outward relative to the smoke collection chamber, the volume of the smoke collection chamber can be altered, increasing the applicability of the range hood. Furthermore, since the retractable body extends outward relative to the smoke collection chamber, the volume of the smoke collection chamber can be increased, thereby expanding the smoke collection range and improving the smoke extraction effect.

[0018] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0020] Figure 1This is a schematic diagram of the smoke collection structure of the range hood provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the smoke collection structure of the range hood provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the smoke collection structure of the range hood provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the range hood provided in an embodiment of the present invention.

[0024] In the diagram: 1-Smoke hood; 11-Left side wall of the smoke hood; 13-Mounting cavity; 131-Front mounting cavity; 132-Rear mounting cavity; 14-Smoke collection cavity; 15-Rear side wall of the smoke hood; 151-First protrusion; 152-First insertion slot; 153-Second insertion slot; 2-Extendable body; 21-First section of extendable body; 22-Second section of extendable body; 3-Cylinder; 31-Cylinder housing; 32-Piston rod; 321-First section of rod; 322-Second section of rod; 4-Chassis; 41-Flanged edge; 5-Oil mesh; 6-Reinforcing rib.

[0025] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a smoke collection structure for a range hood, including a smoke collection hood 1, a smoke collection chamber 14 inside the smoke collection hood 1, and at least one retractable body 2 on the smoke collection hood 1 that can extend or retract relative to the smoke collection chamber 14 to change the volume of the smoke collection chamber 14.

[0030] In embodiments of the present invention, by providing a retractable body 2 on the smoke collection hood 1 that can extend outward relative to the smoke collection cavity 14, the volume of the smoke collection cavity 14 can be increased, the range of smoke collection in the smoke collection cavity 14 can be increased, and the smoke extraction effect of the range hood can be improved.

[0031] Furthermore, the retractable body 2 can extend outward or retract relative to the smoke collection chamber 14, thereby increasing or decreasing the volume of the smoke collection chamber 14. This allows the volume of the smoke collection chamber 14 to be adapted to different concentrations of oil fumes, thus increasing the applicability of the smoke collection hood 1.

[0032] The retractable body 2 extends outward relative to the smoke hood 1. This state is the first state of the retractable body 2, which means that the retractable body 2 extends away from the smoke hood 1. The retractable body 2 retracts inward relative to the smoke hood 1. This state is the second state of the retractable body 2, which means that the retractable body 2 retracts inward towards the smoke hood 1 and returns to the initial state.

[0033] It should be noted that for household stoves, the distribution of burners on the stove includes not only multiple burners distributed along the left and right directions, but also multiple gas burners distributed along the front and back directions. Therefore, it can be considered that when the oil fume concentration is relatively high, the smoke collection chamber 14 will not only have smoke escaping from the left and right sides, but also smoke escaping from the front and back sides. That is, there is a possibility of smoke escaping from the outer periphery of the smoke collection chamber 14. Therefore, the telescopic body 2 can extend outward relative to the smoke collection hood 1 to increase the smoke collection range of the smoke collection chamber 14 in the circumferential direction.

[0034] When the concentration of oil fumes is relatively high, the retractable body 2 is controlled to extend outward relative to the smoke collection hood 1 to increase the smoke collection range of the smoke collection chamber 14. As the concentration of oil fumes becomes relatively low, the retractable body 2 is no longer needed to assist the smoke collection hood 1 in collecting smoke. The retractable body 2 is controlled to retract inward relative to the smoke collection hood 1 to retract the retractable body 2.

[0035] The fume hood 1 is equipped with a concentration sensor. The range hood has a control board, which is connected to the concentration sensor and the drive structure that drives the retractable body 2 to extend and retract. When the concentration of oil fumes sensed by the concentration sensor is greater than the set value, the control board controls the retractable body 2 to extend outward relative to the fume hood 1. When the concentration of oil fumes sensed by the concentration sensor is less than the set value, the control board controls the retractable body 2 to retract inward relative to the fume hood 1, and the retractable body 2 returns to its initial state.

[0036] The retractable body 2 extends outward relative to the smoke hood 1. This can be either a horizontal extension of the retractable body 2 relative to the smoke hood 1 or an extension of the retractable body 2 in other directions based on the horizontal extension of the retractable body 2 relative to the smoke hood 1.

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, in an embodiment of the present invention, the smoke hood 1 is square, and retractable bodies 2 are provided on both the left and right sides of the smoke hood 1. The two retractable bodies 2 can extend outward or retract inward at the same time.

[0038] In an embodiment of the present invention, two retractable bodies 2 are provided on the smoke collection hood 1. Currently, the burners on household stoves are generally arranged in the left-right direction. Therefore, there is a problem of smoke escaping on the left and right sides of the smoke collection chamber 14. In order to reduce the smoke escaping of the smoke collection chamber 14 and increase the smoke collection range of the smoke collection chamber 14, retractable bodies 2 are provided on both the left and right sides of the smoke collection hood 1. The two retractable bodies 2 rotate synchronously, which can increase the smoke collection range of the smoke collection chamber 14 on the left and right sides, and further increase the smoke collection area of ​​the smoke collection chamber 14.

[0039] Two retractable bodies 2 are arranged opposite each other on the left and right sides of the smoke collection hood 1. That is, the two retractable bodies 2 have the same structure and are symmetrically arranged with the smoke collection hood 1 as the center.

[0040] Formation of the smoke collection chamber 14: The inner peripheral wall of the smoke collection hood 1 forms a downward-facing smoke collection chamber 14. In addition, the inner peripheral wall of the smoke collection hood 1 also forms other chambers besides the smoke collection chamber 14.

[0041] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the telescopic body 2 is a strip-shaped plate structure. The telescopic body 2 extends in the front-back direction. One side of the telescopic body 2 is attached to the side wall of the smoke collection hood 1, and the telescopic body 2 protrudes horizontally outward relative to the side wall of the smoke collection hood 1.

[0042] In the embodiments of the present invention, the retractable body 2 is a strip-shaped plate structure. Specifically, the retractable body 2 is an elastic plate capable of elastic deformation, and the material of the elastic plate can be plastic, rubber, etc. The retractable body 2 is a strip-shaped retractable body that extends in the front-back direction, and one side of the retractable body 2 is attached to the left side wall 11 or the right side wall of the smoke hood 1. The left side wall 11 and the right side wall of the smoke hood 1 have the same shape, and the retractable body 2 extends according to the shape trajectory of the left side wall 11 or the right side wall of the smoke hood 1. That is, the shape trajectory of the left side wall or the right side wall of the smoke hood 1 in the front-back direction determines the shape of the retractable body 2.

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, in an embodiment of the present invention, one side of the telescopic body 2 is fitted to the lower edge of the side wall of the smoke collection hood 1.

[0044] In specific embodiments of the present invention, one side of the telescopic body 2 is disposed at the lower edge of the side wall of the smoke collection hood 1, that is, the telescopic body 2 is disposed close to the smoke collection cavity 14, so that the extension of the telescopic body 2 can maximize the smoke collection range of the smoke collection cavity 14.

[0045] The extension length of the telescopic body 2 extends from the front side of the side wall of the smoke collection hood 1 to the rear side of the side wall of the smoke collection hood 1, so that the telescopic body 2 has a long extension length. On the one hand, the extension length of the telescopic body 2 increases the smoke collection surface range of the smoke collection cavity 14, and on the other hand, it increases the fitting length between the telescopic body 2 and the smoke collection hood 1, increases the bonding strength between the telescopic body 2 and the smoke collection hood 1, and ensures the smoothness of telescopic movement.

[0046] In an embodiment of the present invention, a cylinder 3 is provided on the smoke collection hood 1. The cylinder 3 includes a cylinder shell 31 and a piston rod 32 partially embedded in the cylinder shell 31. The piston rod 32 is connected to the telescopic body 2.

[0047] In an embodiment of the present invention, a cylinder 3 is provided on the smoke hood 1. The cylinder 3 provides power for the extension and retraction of the telescopic body 2. Specifically, the cylinder 3 has a piston rod 32 that can extend and retract relative to the cylinder shell 31. The extension and retraction of the piston rod 32 drives the extension and retraction of the telescopic body 2.

[0048] The cylinder 3 can be located at any position on the smoke hood 1, as long as the extension and retraction of the piston rod 32 can drive the telescopic body 2 to extend outward or retract inward relative to the outer axis of the smoke hood 1.

[0049] like Figure 1 and Figure 2As shown, in an embodiment of the present invention, the piston rod 32 includes a first section rod 321 extending in the horizontal direction to drive the telescopic body 2 to extend and retract horizontally, and a second section rod 322 extending in the vertical direction to drive the telescopic body 2 to extend and retract vertically. The second section rod 322 is located on the upper part of the telescopic body 2, and the extension section of the second section rod 322 is connected to the telescopic body 2.

[0050] In an embodiment of the present invention, the piston rod 32 is divided into two sections, namely a first section rod 321 and a second section rod 322. The first section rod 321 extends horizontally and can drive the retractable body 2, which protrudes horizontally relative to the smoke hood 1, to extend horizontally, thereby increasing the smoke collection range of the smoke collection cavity 14. Furthermore, based on increasing the smoke collection range of the smoke collection cavity 14, the second section rod 322 extends vertically and can drive the retractable body 2 to extend vertically, thereby driving the retractable body 2 to extend downward or retract upward, deepening the smoke collection depth of the smoke collection cavity 14 and improving the smoke collection effect of the smoke collection cavity 14.

[0051] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the retractable body 2 includes a first retractable body 21 and a second retractable body 22. The first retractable body 21 is gradually inclined upward from back to front, and the second retractable body 22 is gradually inclined downward from back to front. The second rod 322 is connected at the transition between the first retractable body 21 and the second retractable body 22.

[0052] In an embodiment of the present invention, in order to make the outer side of the smoke hood 1 more aesthetically pleasing, the retractable body 2 is divided into two parts according to the shape trajectory of the left or right side wall of the smoke hood: a first retractable body 21 and a second retractable body 22. Specifically, the first retractable body 21 is inclined upward from back to front, and the second retractable body 22 is inclined downward from back to front, so that the retractable body has a highest position, which is the transition between the first retractable body 21 and the second retractable body 22. Since the depth of the smoke collection cavity 14 is reduced at this transition point compared to other parts of the retractable body, the smoke collection effect of the smoke collection cavity 14 at this position is relatively poor. Therefore, the telescopic section of the second rod 322 is connected to the above-mentioned transition point to ensure that the retractable body 2 extends outward and downward to the maximum extent at this position, thereby compensating for the smoke collection range and smoke collection effect of the smoke collection cavity 14 at this position.

[0053] like Figure 1 and Figure 2As shown in the embodiment of the present invention, the smoke hood 1 is provided with an installation cavity 13 and a smoke collection cavity 14 distributed in the vertical direction. The installation cavity 13 is divided into two independent front installation cavities 131 and a rear installation cavity 132 for installing other components in the front-back direction. The rear installation cavity 132 is connected to the smoke collection cavity 14. The cylinder shell 31 is located in the front installation cavity 131, and the piston rod 32 extends out of the front installation cavity 131 and is connected to the telescopic body 2.

[0054] In an embodiment of the present invention, the smoke hood 1 is provided with an installation cavity 13 and a smoke collection cavity 14, which are arranged vertically and are independent of each other. Specifically, the installation cavity 13 is further divided into a front installation cavity 131 and a rear installation cavity 132. The cylinder housing 31 is located in the front installation cavity 131, and the piston rod 32 of the cylinder 3 extends out of the front installation cavity 131 and connects to the telescopic body 2. Specifically, the left side wall 11 or the right side wall of the smoke hood is provided with a through hole, and the piston rod 32 of the cylinder 3 extends out of the front installation cavity 131 through the through hole. Specifically, the first section 321 of the piston rod 32 extends out of the front installation cavity 131 through the through hole, and the second section 322 of the piston rod 32 is located outside the front installation cavity 131.

[0055] The rear mounting cavity 132 is connected to the smoke collection cavity 14. The bottom of the rear mounting cavity 132 is provided with an inlet that is connected to the smoke collection cavity 14. Other components, such as oil mesh 5, can be installed at the inlet of the rear mounting cavity 132. The smoke collection cavity 14 collects oil fumes. The oil fumes enter the rear mounting cavity 132 through the inlet and the oil mesh 5. The top of the rear mounting cavity 132 is provided with an outlet that is connected to the inlet of the air duct inside the chassis 4. The oil fumes enter the air duct through the mounting cavity 13 and are finally discharged to the outside.

[0056] A partition is placed between the front mounting cavity 131 and the smoke collection cavity 14. The partition slopes downward from back to front, and the cylinder housing 31 is placed on the inclined partition.

[0057] like Figure 4 As shown, the present invention also provides a range hood, including a housing 4, and a smoke collection structure of the range hood provided by the above-mentioned technical solution disposed at the bottom of the housing 4.

[0058] In the embodiments of the present invention, the range hood adopts the smoke collection structure provided by the above-mentioned technical solution. By providing a retractable body on the smoke collection hood 1 that can extend outward relative to the smoke collection cavity 14, the volume of the smoke collection cavity 14 can be increased, the range of smoke collection in the smoke collection cavity 14 can be increased, and the smoke extraction effect of the range hood can be improved.

[0059] The casing 4 is equipped with an air duct that extends vertically. The air duct has an inlet at the bottom and an outlet at the top. The outlet of the rear mounting cavity 132 of the fume hood 1 is connected to the inlet of the air duct. The casing 4 is positioned directly opposite the rear mounting cavity 132, so that the fumes can be quickly discharged to the outside.

[0060] In an embodiment of the present invention, the middle part of the rear sidewall of the smoke hood protrudes upward to form a first protrusion 151. The rear sides of the left and right sidewalls of the chassis 4 are provided with flanges 41 that fit against the rear sidewall of the chassis 4. The bottom of the flanges 41 protrudes downward relative to the sidewall of the chassis 4 to form a second protrusion. The rear sidewall 15 of the smoke hood is provided with two first insertion slots 152. The first protrusions 151 are fitted against the rear sidewall of the chassis 4, and the second protrusions are embedded in the first insertion slots 152.

[0061] In embodiments of the present invention, the assembly between the smoke hood 1 and the chassis 4 includes the following points:

[0062] The first protrusion 151 of the rear side wall 15 of the smoke hood is fixedly connected to the bottom of the rear side wall of the chassis 4 after being attached to it.

[0063] The rear sides of the left and right side walls of the chassis 4 are provided with flanges 41. The bottom of one flange 41 protrudes downward relative to the right side wall of the chassis 4 to form a second protrusion. The bottom of the other flange 41 protrudes downward relative to the left side wall of the chassis 4 to form another second protrusion. The rear side wall 15 of the smoke hood is provided with two upward-facing first insertion slots 152. The two first insertion slots 152 are located on both sides of the first protrusion 151. The two second protrusions are inserted into the corresponding first insertion slots 152.

[0064] The rear side wall of the chassis 4 is provided with a reinforcing rib 6 extending in the vertical direction. The reinforcing rib 6 is used to increase the structural strength of the chassis 4. The first protrusion 151 is provided with a second insertion groove 153 with an upward opening. The bottom of the reinforcing rib 6 is inserted into the second insertion groove 153.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A smoke collection structure for a range hood, comprising a smoke collection hood, wherein the smoke collection hood has a smoke collection chamber, characterized in that, The smoke collection hood is provided with at least one retractable body that can extend or retract relative to the smoke collection chamber to change the volume of the smoke collection chamber; A stretchable body is an elastic plate capable of producing elastic deformation; One side of the telescopic body is fitted to the side wall of the smoke hood, and the telescopic body protrudes horizontally outward relative to the side wall of the smoke hood. The smoke hood is equipped with a cylinder, which includes a cylinder housing and a piston rod partially embedded in the cylinder housing. The piston rod includes a first section extending horizontally and a second section extending vertically. The smoke hood is equipped with a front mounting cavity and a smoke collection cavity; There is a partition between the front mounting cavity and the smoke collection cavity. The partition slopes downward from back to front. The cylinder housing is located on the inclined partition. The first section of the rod extends out of the front mounting cavity and connects to the second section of the rod. The second section of the rod is located on the upper part of the telescopic body, and the telescopic end of the second section of the rod is connected to the telescopic body.

2. The smoke collection structure of the range hood according to claim 1, characterized in that, The smoke hood is square in shape, and there are retractable bodies on both the left and right sides of the smoke hood. The two retractable bodies can extend outward or retract inward at the same time.

3. The smoke collection structure of the range hood according to claim 2, characterized in that, The retractable body extends in the front-to-back direction.

4. The smoke collection structure of the range hood according to claim 3, characterized in that, The retractable body is fitted to the lower edge of the side wall of the smoke hood on one side.

5. The smoke collection structure of the range hood according to any one of claims 1-4, characterized in that, The telescopic body includes a first telescopic body and a second telescopic body. The first telescopic body is gradually inclined upward from back to front, and the second telescopic body is gradually inclined downward from back to front. The telescopic end of the second rod is connected to the transition between the first telescopic body and the second telescopic body.

6. The smoke collection structure of the range hood according to claim 5, characterized in that, The smoke hood has an installation cavity and a smoke collection cavity distributed in the vertical direction. The installation cavity is divided into two independent front installation cavities and a rear installation cavity for installing other components in the front-to-back direction. The rear installation cavity is connected to the smoke collection cavity.

7. A range hood, comprising a casing, characterized in that, It also includes the smoke collection structure of the range hood as described in any one of claims 1-6, located at the bottom of the casing.

8. The range hood according to claim 7, characterized in that, The middle part of the rear sidewall of the smoke hood protrudes upward to form a first protrusion. The rear sides of the left and right sidewalls of the chassis are provided with flanges that fit against the rear sidewall of the chassis. The bottom of the flanges protrudes downward relative to the sidewall of the chassis to form a second protrusion. Two first insertion slots are provided on the rear sidewall of the smoke hood. The first protrusions fit against the rear sidewall of the chassis, and the second protrusions are embedded in the first insertion slots.

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