CN214663940U - Lighting device and L-shaped range hood with same - Google Patents

Abstract

The utility model provides a lighting device and L type cigarette machine that has it. The lighting device includes: a lamp holder having a receiving groove; the light-transmitting lampshade covers the notch of the accommodating groove; and the light-emitting assembly is accommodated in the accommodating groove, the light-emitting assembly comprises a lamp holder, a circuit board and a lamp panel, the lamp holder and the lamp panel are hermetically connected to form an internal cavity between the lamp holder and the lamp panel, the circuit board is accommodated in the internal cavity, the circuit board is electrically connected with the lamp panel, and the lamp panel faces to the light-transmitting lampshade. Encapsulate the circuit board between lamp plate and lamp stand sealedly, can play fine waterproof grease proofing protection's effect to the circuit board, also can have good illuminating effect after long-term the use to longer life has. Moreover, the light-emitting assembly can be made to be a non-detachable whole, so that the light-emitting assembly is small in size, simple in structure, low in cost and easy to install, is arranged in the accommodating groove of the lamp bracket, and can well control the size of the lighting device.

Description

Lighting device and L-shaped range hood with same

Technical Field

The utility model relates to a kitchen utensil technical field specifically, relates to a lighting device and L type cigarette machine that has it.

Background

Along with the improvement of people's standard of living, the user constantly promotes to the requirement of kitchen, all is provided with lighting device on kitchen utensil, for the user provides the illumination at the culinary art in-process, sufficient illumination can improve the experience of user at the culinary art in-process and feel.

Existing lighting devices typically include a housing and a light emitting assembly housed within the housing. The outer shell comprises a lamp holder and a light-transmitting lampshade which are manufactured in a split mode. In the assembling process, the light-emitting component is placed between the light-emitting component and the lamp holder, and then sealant is coated between the lamp holder and the light-transmitting lampshade to prevent oil stains from entering the shell, so that the light-emitting component is protected from oil.

However, the sealant can be aged and failed after long-term use, and the manual coating also has the problem of uneven coating of the sealing element. Once the sealant is invalid, the oil smoke enters the inside of the light-emitting component to influence the light-emitting component, so that the lighting device is damaged.

SUMMERY OF THE UTILITY MODEL

In order to at least partially solve the problems in the prior art, according to one aspect of the present invention, a lighting device is provided. The lighting device includes: a lamp holder having a receiving groove; the light-transmitting lampshade covers the notch of the accommodating groove; and the light-emitting assembly is accommodated in the accommodating groove, the light-emitting assembly comprises a lamp holder, a circuit board and a lamp panel, the lamp holder and the lamp panel are hermetically connected to form an internal cavity between the lamp holder and the lamp panel, the circuit board is accommodated in the internal cavity, the circuit board is electrically connected with the lamp panel, and the lamp panel faces to the light-transmitting lampshade.

The inventor finds that the damage of the lighting device is mainly caused by the fact that the circuit board is attacked by oil stains, the circuit board belongs to a precise part, and the problems of short circuit, open circuit, aging of circuits and components and the like are easy to occur after the circuit board is attacked by the oil stains. The circuit board is hermetically packaged between the lamp panel and the lamp holder, so that good waterproof and oilproof protection can be achieved for the circuit board. The light-emitting component can have good lighting effect after long-term use and has longer service life. Moreover, the light-emitting assembly can be made to be a non-detachable whole, so that the light-emitting assembly is small in size, simple in structure, low in cost and easy to install, is arranged in the accommodating groove of the lamp bracket, and can well control the size of the lighting device.

Illustratively, the lamp socket and the lamp panel are hermetically connected by a weld.

Connect lamp stand and lamp plate through the welding seam sealedly can guarantee also to have good sealing performance after long-term the use, the ageing phenomenon can not appear.

Illustratively, the lamp holder further has a flange extending outwardly from the notch of the receiving groove, and the light-transmitting lamp housing is hermetically connected to the flange.

The light-transmitting lampshade and the lamp bracket after the sealing connection form a closed space in the accommodating groove, so that oil smoke and water vapor can be prevented from entering the accommodating groove through a gap between the light-transmitting lampshade and the lamp bracket, the light-emitting component is prevented from being infected, and further water and oil proofing protection is realized on the circuit board. And this setting has guaranteed the inside cleanness of lighting device effectively, avoids forming the greasy dirt layer on the internal surface of light lampshade and light-emitting component's surface to the light that makes lighting device send does not receive blockking of greasy dirt, and illuminating effect is comparatively stable, thereby promotes the use of product and experiences, and still improved lighting device's life.

Exemplarily, be provided with the first annular groove that surrounds the holding tank on the turn-ups, be provided with sealed glue in the first annular groove, the translucent lampshade is connected with the turn-ups through sealed glue.

The sealant can fix the light-transmitting lampshade on the lamp holder and can also play a role in sealing the light-transmitting lampshade and the lamp holder.

Illustratively, the width of the first annular groove is between 2mm and 6 mm; and/or the width of the first annular groove is between 1mm and 5 mm; and/or the aspect ratio of the first annular groove is between 0.5 and 1.

The preferable size range is determined by comprehensively considering the bonding strength and the sealing effect of the light-transmitting lamp cover and the lamp holder, and avoiding the excessive thickness of the lamp holder. If the aspect ratio is too large, that is to say, the depth of the first annular groove is far greater than the width, when the sealant is injected into the first annular groove, the sealant cannot fill the first annular groove, a small amount of air is filled into the first annular groove, and after the sealant is dried in the air, a gap may be formed on the bonding surface, which affects the bonding effect. Moreover, a gap is formed, and water or oil is easily immersed in the lighting device, which affects the service life of the lighting device.

Exemplarily, the back of the lamp holder is provided with a second annular groove extending along the edge of the lamp holder, a sealant is arranged in the second annular groove, and the lamp holder is connected with the lamp holder through the sealant.

Through this setting, can be connected lamp stand and lighting fixture bonding. Under the firm condition of assurance, avoided the phenomenon that joint seam appears in other connected modes to play waterproof and oilproof effect, further prolonged lighting device's life and guaranteed its illuminating effect's effect.

Illustratively, the back surface of the lamp holder is further provided with a third annular groove, and the second annular groove surrounds the third annular groove.

The seal also provides a seal and an adhesive bond between the lamp base and the lamp holder. Therefore, the bonding strength of the lamp holder and the lamp holder can be further improved, and the lamp holder is prevented from falling off from the lamp holder.

Illustratively, the width of the second annular groove is between 5mm and 10 mm; and/or the width of the second annular groove is between 1mm and 5 mm; and/or the aspect ratio of the second annular groove is between 0.2 and 0.8.

The above-mentioned preferred size range is determined in consideration of the combination of the adhesive strength and the sealing effect between the lamp socket and the lamp holder, and the avoidance of the excessive thickness of the lamp socket. If aspect ratio is too big, that is to say the degree of depth of the second annular recess is far greater than the width, then when pouring into sealed glue into the second annular recess, lead to sealed glue can not fill up the second annular recess easily, and seal into a small amount of air in the second annular recess, after sealed glue air-dries, can produce the space on the adhesive surface, influence bonding effect. Moreover, a gap is formed, and water or oil is easily immersed in the lighting device, which affects the service life of the lighting device. The aspect ratio of the second annular groove may be smaller than the aspect ratio of the first annular groove. That is, in the case that the depth of both is the same, the width of the second annular groove may be larger because the space of the rear surface of the lamp holder is larger, and the second annular groove may be provided wide enough to increase the adhesive strength between the lamp holder and the lamp holder. And the width of first annular groove can be suitable for a little to make the turn-ups narrow a little, like this, under the certain circumstances of light lampshade size, can increase its size that is used for non-light tight printing opacity district, can set up bigger lamp plate like this, with increase lighting device's luminance.

According to another aspect of the utility model, provide a L type cigarette machine, including the collection petticoat pipe, the collection petticoat pipe includes the top portion that extends forward and the rear portion of downwardly extending, and L type cigarette machine still includes any kind of lighting device above-mentioned, and lighting device sets up the lower surface at the top portion.

Like this, when culinary art, can open lighting device, improve the regional luminance of L type cigarette machine below cooking utensils, convenience of customers carries out the operation, improves and uses experience.

Illustratively, the lower surface is provided with a mounting groove, the lighting device is arranged in the mounting groove, and the light-transmitting lamp shade is flush with the lower surface.

Like this, because the lower surface flushes with the light lampshade, can not produce the sanitary dead angle between lower surface and light lampshade, so just very convenient when clean, also improved user's use moreover and experienced.

Illustratively, the lighting device is disposed in a middle region of the lower surface.

Therefore, light rays emitted by the lighting device can be aligned to the cooker below, the whole cooker is covered as much as possible, and the lighting effect is improved.

A series of concepts in a simplified form are introduced in the disclosure, which will be described in further detail in the detailed description section. The summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a cross-sectional view of a lighting device according to an exemplary embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the lighting device shown in FIG. 1;

figure 3 is a front view of an L-shaped range hood according to an exemplary embodiment of the present invention; and

figure 4 is a left side view of the L-type cigarette machine shown in figure 3.

Wherein the figures include the following reference numerals:

100. an L-shaped range hood; 200. a smoke collecting hood; 210. a top portion; 220. a rear portion; 221. an air inlet; 400. an illumination device; 402. an interior cavity; 410. a lamp holder; 411. accommodating grooves; 412. flanging; 420. a light emitting assembly; 421. a lamp socket; 422. a circuit board; 423. a lamp panel; 430. a light-transmitting lamp shade; 501. a first annular groove; 502. a second annular groove; 503. a third annular groove.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present invention. One skilled in the art, however, will understand that the following description illustrates only a preferred embodiment of the invention and that the invention may be practiced without one or more of these details. In addition, some technical features that are well known in the art are not described in detail in order to avoid obscuring the present invention.

According to an aspect of the present invention, a lighting device 400 is provided. As shown in fig. 1-2, the lighting device 400 includes a lamp holder 410, a light emitting assembly 420, and a light-transmissive lamp cover 430. The lamp holder 410 may serve as a carrier of the lighting device 400, and the light emitting assembly 420 and the light-transmitting lamp cover 430 are disposed on the lamp holder 410. The lighting device 400 may also be mounted on the cooktop by a lamp holder 410. A receiving groove 411 is further provided on the lamp holder 410, and the light emitting assembly 420 can be received in the receiving groove 411. The transparent lamp cover 430 covers the notch of the receiving groove 411. The lamp holder 410 and the light-transmitting lamp cover 430 together form an outer case of the lighting device 400, enclosing the light emitting assembly 420 therein. The light-transmitting lamp cover 430 may be a single member, and is made of any light-transmitting material such as glass, resin, etc., preferably glass. The lamp holder 410 may be a sheet metal part, and the accommodating groove 411 of various specifications is formed according to the size requirement of the light emitting assembly 420 through the processing of processes such as stamping. The lighting device 400 with the arrangement is simple in structure and easy to implement.

The light assembly 420 may include a lamp socket 421, a circuit board 422, and a lamp panel 423. The lamp socket 421 and the lamp panel 423 are hermetically connected to form a hermetically sealed internal cavity 402 between the lamp panel 423 and the lamp socket 421. The sealing connection may be achieved by providing a sealing member between the lamp socket 421 and the lamp panel 423 or by gluing. Further, the lamp socket 421 and the lamp panel 423 may be hermetically connected by welding. Connect lamp stand and lamp plate through the welding seam sealedly can guarantee also to have good sealing performance after long-term the use, the ageing phenomenon can not appear. Preferably, the weld may be formed by connecting the lamp panel 423 and the lamp socket 421 by ultrasonic welding. In other embodiments, the weld may also be formed by other welding processes known to those skilled in the art. A wiring board 422 is received within the interior cavity 402. The lamp panel 423 faces the light permeable cover 430. The lamp panel 423 is a main light emitting element. Exemplarily, the lamp panel 423 may be provided with a plurality of lamp beads, for example, LED lamp beads. The inventor finds that the reason for the damage of the lighting device is mainly that the circuit board 422 is attacked by oil stains, the circuit board 422 belongs to a precise part, and the problems of short circuit, open circuit, aging of circuits and components and the like are easy to occur after the circuit board 422 is attacked by the oil stains. Encapsulate circuit board 422 between lamp plate 423 and lamp stand 421 sealedly, can play fine waterproof grease proofing protection to circuit board 422. Moreover, the light emitting assembly 420 can be made to be a non-detachable whole, so that the light emitting assembly 420 has a small volume, a simple structure, a low cost and easy installation, is arranged in the accommodating groove 411 of the lamp holder 410, and can well control the size of the lighting device 400. Meanwhile, the lamp holder 421 and the lamp panel 423 are connected in a sealing manner, water and oil proofing protection is formed on the circuit board 422, the water and oil proofing performance of the light emitting component 420 is improved, a good lighting effect can be achieved after long-term use, and the service life is long.

Illustratively, light holder 410 has a flange 412 extending outwardly from the slot of receiving slot 411. The flange 412 extends toward the outside of the receiving groove 411. The cover 430 can be attached to the flange 412. The translucent lampshade 430 is hermetically connected with the flange 412. The sealing connection between the transparent lampshade 430 and the flange 412 can be various, for example, a sealing strip is arranged between the two, and the bolt penetrating connection is used for pressing the sealing strip to achieve the sealing effect. Alternatively, the light-transmitting lamp cover 430 and the flange 412 may be connected through bolts, and the joint may be sealed with sealant. In a word, the light-transmitting lamp cover 430 and the lamp holder 410 after the sealing connection form a closed space in the accommodating groove 411, so that oil smoke and water vapor can be prevented from entering the accommodating groove 411 through a gap between the light-transmitting lamp cover 430 and the lamp holder 410, the light-emitting component 420 is prevented from being infected, and further water and oil proofing protection is performed on the circuit board 422. And this setting has guaranteed the inside cleanness of lighting device 400 effectively, avoids forming the greasy dirt layer on the internal surface of translucent lampshade 430 and light-emitting component 420's surface to the light that makes lighting device 400 send does not receive blockking of greasy dirt, and the illuminating effect is comparatively stable, thereby promotes the use of product and experiences, and still improved lighting device 400's life.

In a preferred embodiment, the flange 412 is provided with a first annular groove 501 surrounding the receiving groove 411. The first annular recess 501 is not necessarily circular, but is formed around the flange 412 according to the shape of the flange 412, and is finally connected end to end. The first annular groove 501 may be a square ring. A sealant may be disposed in the first annular groove 501, and the sealant may fix the transparent lampshade 430 to the lamp holder 410 and may also seal the lamp holder before the transparent lampshade and the lamp holder. The sealant can be any sealant that may be present or may be present in the future according to the material of the transparent lampshade 430 and the material of the flange 412, as long as the adhesive surface of the flange 412 and the transparent lampshade 430 are fully sealed, so as to seal the accommodating groove 411 of the lighting device 400. Preferably, the sealant may be silicone. The silica gel has the advantages of strong adhesive force, high tensile strength, adaptability to cold and heat changes, low cost, capability of realizing adhesion among most materials and the like.

Illustratively, the width of the first annular groove 501 may be between 2mm and 6 mm. Illustratively, the depth of the first annular groove 501 may be between 1mm and 5 mm. The preferred size range is determined in consideration of the adhesive strength and sealing effect of the light-transmitting lamp housing 430 and the lamp holder 410, and the avoidance of the excessive thickness of the lamp holder 410. Preferably, the width is 3mm and the depth is 2 mm. Illustratively, the aspect ratio of the first annular groove 501 may be between 0.5 and 1. If the aspect ratio is too large, that is to say, the depth of the first annular groove 501 is much greater than the width, when the sealant is injected into the first annular groove 501, the sealant is easily prevented from filling the first annular groove 501, and a small amount of air is sealed into the first annular groove 501, after the sealant is air-dried, a gap may be generated on the bonding surface, which affects the bonding effect. Moreover, a gap is formed, and water or oil is easily immersed in the lighting device, which affects the service life of the lighting device.

Illustratively, the back surface of the lamp socket 421 may be provided with a second annular groove 502 extending along an edge thereof. The second annular groove 502 is provided with a sealant therein, and the lamp holder 421 is connected to the lamp holder 410 by the sealant. Preferably, the sealant is silicone. Through this setting, not only can be connected lamp stand 421 with lighting fixture 410 bonding, but also can form sealedly between lamp stand 421 and lighting fixture 410 to play waterproof and oil-proof effect, further prolonged lighting device 400's life and guaranteed its illuminating effect's effect. In addition, the circuit board 422 is provided with an external lead, the external lead can penetrate through the threading hole on the back surface of the lamp holder 421 from the area surrounded by the second annular groove 502, and therefore the sealant in the second annular groove 502 can also prevent the external lead and the threading hole on the back surface of the lamp holder 421 from being invaded by oil stains.

Illustratively, the width of the second annular groove 502 may be between 5mm and 10 mm. Illustratively, the depth of the second annular groove 502 may be between 1m-5 mm. The preferred size range is determined in consideration of the combination of the adhesive strength and the sealing effect between the lamp socket 421 and the lamp holder 410, and the avoidance of the excessive thickness of the lamp socket 421. Preferably, the width is 8mm and the depth is 2 mm. The aspect ratio of the second annular groove 502 may be between 0.2 and 0.8. If the aspect ratio is too large, that is to say, the depth of the second annular groove 502 is much greater than the width, when the sealant is injected into the second annular groove 502, the sealant is likely to be unable to fill the second annular groove 502, and a small amount of air is sealed into the second annular groove 502, after the sealant is air-dried, a gap may be generated on the bonding surface, which affects the bonding effect. Moreover, a gap is formed, and water or oil is easily immersed in the lighting device, which affects the service life of the lighting device. The aspect ratio of the second annular groove 502 may be smaller than the aspect ratio of the first annular groove 501. That is, in the case that the depth of both is the same, the width of the second annular groove 502 may be larger because the space of the rear surface of the lamp socket 421 is larger, and the second annular groove 502 may be provided wide enough to increase the adhesive strength between the lamp socket 421 and the lamp holder 410. And the width of first annular recess 501 can be suitable for a little to make turn-ups 412 narrow, like this, under the certain circumstances of light lampshade 430 size, can increase its size that is used for the printing opacity district of printing opacity, can set up bigger lamp plate 423 like this, with the luminance of increase lighting device 400.

Illustratively, the back surface of the lamp holder 421 is further provided with a third annular groove 503, and the second annular groove 502 surrounds the third annular groove 503. The third annular groove 503 may be sized with reference to the second annular groove 502. A sealant is disposed in the third annular groove 503. The sealing member also serves to seal and adhere between the lamp socket 421 and the lamp holder 410. Therefore, the bonding strength between the lamp holder 421 and the lamp holder 410 can be further improved, and the lamp holder 421 can be prevented from falling off from the lamp holder 410.

In accordance with another aspect of the present invention, an L-shaped range hood 100, as shown in figures 3-4, is provided that includes a smoke collection hood 200. The smoke collection cage 200 includes a forwardly extending top portion 210 and a downwardly extending rear portion 220. The fan assembly may be disposed within the top portion 210, although the fan assembly may be disposed above the top portion 210. The rear portion 220 is generally adjacent to a wall, and the rear portion 220 has a width that is narrower than the width of the top portion 210 when viewed from the side of the L-shaped machine 100. An air inlet 221 is provided at the front of the rear part 220. When the L-type range hood 100 is operating normally, the cooking fumes enter the smoke collecting hood 200 through the air inlet 221 on the rear portion 220, flow upward, enter the top portion 210, and finally exit the L-type range hood 100.

The L-shaped cigarette machine 100 also includes any of the lighting devices 400 described above. The lighting device 400 is disposed on the lower surface of the top portion 210. Like this, when culinary art, can open lighting device 400, improve the regional luminance of L type cigarette machine 100 below cooking utensils, convenience of customers carries out the operation, improves and uses experience.

After the cigarette making machine 100 is used for a long time, the cigarette making machine is infected by oil stains, particularly, the oil stains can be stored in a place with unevenness, and the cleaning is very inconvenient. Thus, the lower surface of the top portion 210 of the L-shaped range hood 100 is provided with a mounting slot into which the lighting device 400 may be positioned. The completed lighting device 400 is mounted with the light-transmitting cover 430 flush with the lower surface. Thus, because the lower surface is flush with the light-transmitting lampshade 430, sanitary dead angles cannot be generated between the lower surface and the light-transmitting lampshade 430, the cleaning is very convenient, and the use experience of a user is also improved.

Illustratively, the lighting device 400 is disposed in a middle region of the lower surface. Therefore, the light emitted by the lighting device 400 can be aligned to the cooker below, the whole cooker is covered as much as possible, and the lighting effect is improved.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front", "rear", "upper", "lower", "first", "second", "horizontal", "vertical", "horizontal" and "top", "bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe the spatial relationship of one or more components or features shown in the figures to other components or features. It is to be understood that the spatially relative terms are intended to encompass not only the orientation of the component as depicted in the figures, but also different orientations of the component in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be positioned at various other angles (e.g., rotated 90 degrees or other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (11)

1. An illumination device, characterized in that the illumination device comprises:

a lamp holder having a receiving groove;

the light-transmitting lampshade covers the notch of the accommodating groove; and

light emitting component, it holds in the holding tank, light emitting component includes lamp stand, circuit board and lamp plate, the lamp stand with lamp plate sealing connection to form inside cavity at both, the circuit board holds in the inside cavity, the circuit board with the lamp plate electricity is connected, the lamp plate towards the printing opacity lamp shade.

2. The lighting device of claim 1, wherein the light holder and the light panel are hermetically connected by a weld.

3. The lighting device of claim 1 wherein said lamp holder further comprises a flange extending outwardly from said slot of said receiving pocket, said light-transmissive lamp housing being sealingly connected to said flange.

4. The illumination device as claimed in claim 3, wherein a first annular groove surrounding the receiving groove is formed on the flange, a sealant is disposed in the first annular groove, and the light-transmitting lamp cover is connected to the flange through the sealant.

5. The illumination device of claim 4, wherein the first annular groove has a width of between 2mm and 6 mm; and/or the width of the first annular groove is between 1mm and 5 mm; and/or the aspect ratio of the first annular groove is between 0.5 and 1.

6. The lighting device as defined in claim 1, wherein a second annular groove is formed on a back surface of said lamp holder and extends along an edge thereof, a sealing adhesive is disposed in said second annular groove, and said lamp holder are connected by said sealing adhesive.

7. A lighting device as recited in claim 6, wherein said back surface of said lamp holder is further provided with a third annular recess, said second annular recess surrounding said third annular recess.

8. The illumination device of claim 6, wherein the width of the second annular groove is between 5mm-10 mm; and/or the width of the second annular groove is between 1mm and 5 mm; and/or the aspect ratio of the second annular groove is between 0.2 and 0.8.

9. An L-type machine comprising a smoke-collecting hood comprising a forwardly extending top portion and a downwardly extending rear portion, wherein the L-type machine further comprises a lighting device as claimed in any one of claims 1 to 8, the lighting device being disposed on a lower surface of the top portion.

10. An L-shaped machine as claimed in claim 9, wherein said lower surface is provided with a mounting slot, said lighting device being disposed within said mounting slot, said light-transmitting shade being flush with said lower surface.

11. An L-shaped machine as claimed in claim 9, wherein said illumination means is provided at a mid-region of said lower surface.

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