CN102052613B - lamps - Google Patents

Abstract

The invention discloses a lamp, which comprises an outer cover, an inner shell seat, a fan, a radiator and a light-emitting element. The outer cover is provided with a first accommodating chamber and a first opening, the inner shell base is provided with a second accommodating chamber and a second opening, the inner shell base is further provided with a through hole which is communicated with the first accommodating chamber and the second accommodating chamber, the inner shell base is arranged in the first accommodating chamber, the second opening is aligned with the first opening, a space is formed between the outer cover and the inner shell base to form an air flow channel, the fan is adjacent to the through hole and provided with two air flow circulation sides, the two air flow circulation sides suck and blow air flow, the air flow passes through the through hole, one surface of a bottom plate of the radiator faces the fan, and the other surface of the bottom plate of the radiator is provided with the light-emitting element. Therefore, better airflow circulation and heat dissipation efficiency can be provided, and the service life and the luminous efficiency of the lamp are prevented from being influenced.

Description

lamps

technical field

The present invention relates to a lamp, especially a lamp embedded in the ceiling to provide indoor or outdoor lighting.

Background technique

The existing embedded lamp structure, as shown in Taiwan Patent Publication No. M359644 "Lamp Heat Dissipation Device", includes a base plate, an annular heat sink, a fan and a shell cover. The substrate has two surfaces, one of which is provided with several light-emitting elements, and the other surface can be combined with the annular cooling seat, and several air holes pass through between the two surfaces of the substrate, and the fan is installed on the annular cooling seat , the shell cover is arranged on the outside of the annular heat sink and the fan and combined with the base plate, so that the surface of the base plate with the light-emitting element faces outward. Since the case cover is provided with several ventilation slots, when the fan is running, the airflow can be driven to enter the interior of the case cover through each of the ventilation slots, pass through the periphery of each heat dissipation fin of the annular heat sink, and then pass through each air hole of the substrate Blow out to achieve the purpose of dissipating heat from each light-emitting element.

Generally, recessed lamps are embedded in the ceiling of light steel frame or decorative partition, so that the shell cover is buried above the ceiling, and only the surface of the substrate with light-emitting elements is left exposed on the ceiling surface. Therefore, the existing structure The ventilation slots of the housing cover are located above the ceiling. However, the space above the ceiling and the concrete floor slab of the building itself is generally closed, this space is not easy to circulate with outside air, and other items (such as pipes, lines or heat insulation materials) may be placed in this space , which in turn affects its air circulation effect and heat dissipation performance.

As mentioned in the previous paragraph, due to the poor heat dissipation efficiency of the existing structure, it is easy to cause the heat accumulation problem of the annular heat sink, resulting in that the heat generated by each light-emitting element cannot be smoothly removed, so that each light-emitting element and its chip are in a long time. High temperature environment will affect its service life. Moreover, when the chip of each light-emitting element is overheated, light decay will be caused, thereby affecting the luminous efficiency of each light-emitting element.

Utility model content

The object of the present invention is to provide a lamp, which can improve the heat dissipation efficiency of the lamp.

Another object of the present invention is to provide a lamp, which can prolong the service life of the lamp.

Another object of the present invention is to provide a lamp, which can avoid light decay without affecting the luminous efficacy of the lamp.

According to the lamp of the present invention, it comprises: an outer cover with a first opening at one end, and a first chamber is recessed from the first opening; A second chamber is recessed, the inner shell seat is set in the first chamber, the second opening is aligned with the first opening, and there is a distance between the outer cover and the inner shell seat to form an air flow channel, the The inner shell seat is also provided with a through hole, which communicates with the first chamber and the second chamber; a fan is arranged adjacent to the through hole, and the fan has two air flow sides, and the two air flow sides suck and Blow out the airflow so that the airflow passes through the through hole; a radiator is arranged in the second chamber, the radiator has a bottom plate, and one side of the bottom plate faces the fan; and a light emitting element is arranged in the second chamber, And set on the other side of the bottom plate.

Owing to having above-mentioned structure, the present invention has following advantage compared with prior art:

1. When the outer cover of the lamp of the present invention is buried above the ceiling, the air vents and the perforations are all located on the bottom of the ceiling, which can circulate smoothly with the outside air to improve the air circulation effect and heat dissipation efficiency.

2. The air circulation effect and heat dissipation performance of the lamp of the present invention are better, and the heat generated by each light-emitting element can be smoothly removed, and the service life of the lamp can be extended.

3. The lamp of the present invention can smoothly remove the heat generated by each light-emitting element, so as to avoid overheating of the chip of each light-emitting element and cause light decay, without affecting the luminous efficacy of the lamp.

Description of drawings

Figure 1: An exploded perspective view of the first embodiment of the present invention.

Fig. 2: A combined sectional view of the first embodiment of the present invention.

Fig. 3: An exploded perspective view of the second embodiment of the present invention.

Fig. 4: An assembled sectional view of the second embodiment of the present invention.

Fig. 5: An assembled sectional view of the third embodiment of the present invention.

Fig. 6: An exploded perspective view of a fourth embodiment of the present invention.

Fig. 7: An assembled sectional view of the fourth embodiment of the present invention.

[Description of main component symbols]

1 outer cover 11 first chamber 12 first opening

13 First flange 14 Spacer 1’ Outer cover

11'first chamber 12'first opening 13'first flange

1” Outer Cover 11” First Opening 12” Vent

2 inner shell seat 21 second chamber 22 second opening

23 second flange 24 through hole 25 cover plate

251 perforation 2’ inner shell seat 21’ second opening

22’Second Flange 23’Through Hole 3 Fans

31 Air inlet side 32 Air outlet side 3’ fan

4 radiator 41 bottom plate 42 cooling fins

4’ radiator 41’ bottom plate 42’ cooling fins

5 Light-emitting element 51 Substrate 52 Luminous body

6 inner shell seat 61 second chamber 62 second opening

63 Second flange 64 Through hole 65 Air guide cover

651 Assembly hole 66 Spacer 7 Outer cover

71 First chamber 72 First opening 73 First flange

74 Spacer 8 Inner Shell Seat 81 Second Compartment

81a upper chamber 81b lower chamber 82 second opening

83 Second flange 84 Through hole 85 Spacer

86 Grooving 87a The first air hole 87b The second air hole

88 partition 881 installation hole 89 cover plate

9 Ceiling A Airflow channel A1 First channel

A2 Second channel B Vent

Detailed ways

In order to make the above-mentioned and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention are specifically cited below, together with the accompanying drawings, as follows:

Referring to FIGS. 1 and 2 , the lamp according to the first embodiment of the present invention includes an outer cover 1 , an inner housing 2 , a fan 3 , a radiator 4 and a light emitting element 5 . Wherein, the inner shell base 2 is arranged in the outer cover 1, and an airflow channel A is formed between the outer cover 1 and the inner shell base 2, the fan 3 is arranged in a through hole 24 adjacent to the inner shell base 2, and the radiator 4 and the light-emitting element 5 are arranged in the inner shell seat 2, so that when the fan 3 is running, the airflow can be driven to circulate between the airflow passage A and the interior of the inner shell seat 2 through the through hole 24, so as to disperse the light-emitting element 5 The heat energy generated.

One end of the cover 1 has a first opening 12 , and a first chamber 11 is recessed from the first opening 12 , and a first flange 13 can extend outward from the periphery of the first opening 12 .

One end of the inner shell seat 2 has a second opening 22 , and a second chamber 21 is recessed from the second opening 22 , and a second flange 23 can also extend outward from the periphery of the second opening 22 . Wherein, the outer diameter of the inner shell seat 2 is preferably smaller than the inner diameter of the first chamber 11 of the outer cover 1, the shape of the second opening 22 is preferably the same as the shape of the first opening 12, and the inner diameter of the second opening 22 is Smaller than the inner diameter of the first opening 12 , the second opening 22 is located within the range of the first opening 12 when the inner casing seat 2 is disposed in the first chamber 11 of the outer cover 1 . The inner shell seat 2 is further provided with a through hole 24, the through hole 24 runs through the outer surface of the inner shell seat 2 and the inner wall surface of the second chamber 21, so as to communicate with the first chamber 11 and the second chamber 21 .

In addition, a spacer 14 is provided between the outer cover 1 and the inner shell seat 2, and the spacer 14 can be in the form of strips, columns, blocks or sheets protruding from ribs, support columns or retaining walls, and the spacer The member 14 can be arranged on the inner wall of the first chamber 11, or on the outer surface of the inner shell seat 2, so that when the outer cover 1 and the inner shell seat 2 are combined, they can be spaced apart to form a distance therebetween. In this embodiment, the spacer 14 is selected to set several ribs on the inner peripheral wall of the first chamber 11, and each of the ribs abuts against the outer surface of the inner shell seat 2 to support the outer cover 1 and the inner shell seat at intervals. 2 to form the gap.

The fan 3 is preferably arranged on the inner casing 2 adjacent to the through hole 24 to drive the air flow through the through hole 24, and the fan 3 has two air flow sides, the two air flow sides are an air inlet side 31 and the air flow side 31. 32 on the air outlet side.

The heat sink 4 is preferably made of a material with high thermal conductivity, and the heat sink 4 has a bottom plate 41 , and a plurality of cooling fins 42 are disposed on one side of the bottom plate 41 .

The light emitting element 5 has a substrate 51 and a plurality of light emitters 52 , each of the light emitters 52 is preferably a light emitting diode, and each of the light emitters 52 is disposed on one side of the substrate 51 .

Referring again to Figures 1 and 2, when the lamp of the first embodiment of the present invention is assembled, the inner shell seat 2 is arranged in the first chamber 11 of the outer cover 1, so that the second opening 22 of the inner shell seat 2 is aligned with the The first opening 12 of the cover 1 is aligned, and the second opening 22 is located within the range of the first opening 12 . The outer cover 1 and the inner shell seat 2 are supported by spacers 14 in the form of several ribs to form an airflow channel A, and the first flange 13 and the second flange 23 can also be separated by the spacer. The spacer 14 is supported to form a vent B, so that the outside air outside the lamp can communicate with the airflow channel A inside the lamp through the vent B.

The fan 3 can be installed on the inner casing 2 adjacent to the through hole 24, or can be directly installed in the through hole 24, so that one airflow side of the fan 3 is connected to the airflow channel A, and the other airflow side is connected to The second chamber 21 can drive the airflow to communicate between the airflow channel A and the second chamber 21 through the through hole 24 . In this embodiment, the fan 3 is arranged on the inner surface of the inner casing 2 adjacent to the through hole 24, and the air inlet side 31 is connected to the air passage A, and the air outlet side 32 is connected to the second container. chamber 21 , so as to drive the airflow to be sucked from the vent B, and flow to the second chamber 21 through the airflow channel A and the through hole 24 .

The radiator 4 is disposed in the second chamber 21 , and the surface of the bottom plate 41 of the radiator 4 provided with the cooling fins 42 preferably faces the air outlet side 32 of the fan 3 . In addition, the heat dissipation fins 42 of the heat sink 4 can be evenly distributed on the bottom plate 41, or as shown in this embodiment, each heat dissipation fin 42 is arranged around the outer periphery of the bottom plate 41, so that each heat dissipation fin 42 An assembly space is formed between them for setting the fan 3 .

The substrate 51 of the light emitting element 5 is disposed on the other side of the bottom plate 41 of the heat sink 4 without the heat dissipation fins 42 , so that each of the light emitters 52 faces the second opening 22 . Moreover, the second opening 22 of the inner shell seat 2 can be further provided with a cover plate 25, the cover plate 25 is preferably a transparent or opaque light-permeable plate body, and the cover plate 25 is provided with several perforations 251, each of which The perforation 251 is preferably located on the periphery of the cover plate 25 .

Referring to FIG. 2 , when the lamp of the first embodiment of the present invention is implemented, the outer cover 1 is embedded above the ceiling 9 , so that the first flange 13 of the outer cover 1 is attached to the surface of the ceiling 9 . When the fan 3 is in operation, the airflow can be driven to circulate between the airflow channel A and the second chamber 21 through the through hole 24, and at the same time, the airflow can pass through the periphery of the heat sink 4 to assist in dissipating the light generated by the light emitting element 5. heat energy. Moreover, the present invention can change the flow direction of the airflow by controlling the forward and reverse rotation directions of the fan 3 . For example, when the fan 3 rotates forward, the airflow is forced to be sucked from the vent B and the airflow channel A, and flows to the periphery of the radiator 4 of the second chamber 21 through the through hole 24, and then the cover plate 25 Each perforation 251 is discharged. Conversely, when the fan 3 rotates in the reverse direction, the airflow is forced to be sucked from each perforation 251 of the cover plate 25, and after passing through the periphery of the radiator 4 of the second chamber 21, it passes through the through hole 24, The airflow channel A and the vent B are exhausted to help dissipate the heat energy generated by the light emitting element 5 .

However, regardless of the flow direction of the airflow, the vent B and the perforations 251 of the present invention protrude from the surface of the ceiling 9 and can circulate smoothly with the outside air. And the second flange 23 of the inner shell base 2 is blocked between the vent B and each of the perforations 251, which can prevent the hot air discharged from the lamp from being sucked back into the lamp immediately, so as to provide better air circulation effect and cooling performance.

Please refer to shown in Fig. 3, the light fixture of the second embodiment of the present invention, this light fixture also comprises an outer cover 1 ', an inner housing base 6, a fan 3 ', a radiator 4 ' and a light emitting element 5.

Compared with the aforementioned first embodiment, this second embodiment is further provided with several through holes 64 on the inner shell base 6, and the fan 3' is arranged adjacent to each of the through holes 64, and the fan 3' is relatively Preferably, it is arranged between each of the through holes 64 , so that the air flow can be circulated between the air flow channel A and the second chamber 61 through each of the through holes 64 . The inner shell base 6 also has an air guide 65, which is a disk-shaped body, and the center of the air guide 65 is provided with an assembly hole 651, and the assembly hole 651 can accommodate the fan 3'. The outer peripheral edge of the air guide cover 65 extends outward in a curved arc shape, so as to facilitate the smoothness of the fan 3' into and out of the wind. The outer peripheral edge of the air guide cover 65 is combined with the inner shell seat 6, and each of the through holes 64 is located in the range covered by the wind deflector 65 when combined with the inner case seat 6 .

In addition, a spacer 66 is also provided between the outer cover 1' and the inner shell seat 6 of the second embodiment, and the spacer 66 is selected to set several support columns on the second flange 63 of the inner shell seat 6, each of which The support column abuts against the first flange 13 ′ of the outer cover 1 ′, and is supported between the outer cover 1 ′ and the inner housing base 6 to form a distance.

Referring again to Figures 3 and 4, when the lamp of the second embodiment of the present invention is assembled, the inner shell seat 6 is also arranged in the first chamber 11' of the outer cover 1', so that the second inner shell seat 6 The opening 62 is aligned with the first opening 12' of the cover 1', and the second opening 62 is located within the range of the first opening 12'. The outer cover 1' and the inner shell seat 6 are supported by spacers 66 in the form of several support columns to form an air flow channel A, and to form a gap between the first flange 13' and the second flange 63. A vent B.

The fan 3' is arranged on the air guide cover 65, the radiator 4' is arranged on the inner housing base 6, and the surface of the radiator 4' bottom plate 41' provided with cooling fins 42' preferably faces the Fan 3'. The substrate 51 of the light emitting element 5 is disposed on the other side of the heat sink 4' bottom plate 41' without the heat dissipation fins 42', so that each of the light emitters 52 faces the second opening 62.

Referring to Fig. 4, when the light fixture of the second embodiment of the present invention is implemented, the outer cover 1' is also buried above the ceiling 9, so that the first flange 13' of the outer cover 1' is attached to the surface of the ceiling 9. When the fan 3' is in operation, the airflow can also be driven to circulate between the airflow channel A and the second chamber 62 through the through holes 64, and at the same time, the airflow can pass through the periphery of the radiator 4' to assist in dissipating the light. The heat energy generated by element 5. Therefore, in addition to providing better air circulation and heat dissipation performance, the second embodiment is further conducive to the smoothness of the fan 3' into and out of the air.

Please refer to FIG. 5, the lamp of the third embodiment of the present invention, the lamp also includes an outer cover 1", an inner shell seat 2', a fan 3', a radiator 4' and a light emitting element 5. Compared with In the above-mentioned second embodiment, the peripheral edge of the second opening 21' of the inner shell seat 2' of the third embodiment also extends outwards with a second flange 22', but the outer peripheral edge of the second flange 22' is combined with the The end edge of the first opening 11" of the outer cover 1" is used to close the first opening 11" of the outer cover 1". There is also a gap between the outer cover 1" and the inner shell seat 2' to form an airflow channel A, and the outer cover The outer surface of 1" is provided with several ventilation holes 12" adjacent to the first opening 11".

When the light fixture of the third embodiment of the present invention is implemented, the outer cover 1" is also buried above the ceiling 9, so that the section of the outer cover 1" that is provided with the vent hole 12" protrudes from the surface of the ceiling 9. When the fan 3' During operation, the airflow can be sucked in through each of the air holes 12" and the airflow channel A, and flow through the periphery of the heat sink 4', and then blow out through each of the through holes 23' to assist in dissipating the light generated by the light emitting element 5. heat energy. Since the first opening 11" of the third embodiment is closed by the second flange 22', it has a better overall aesthetic effect.

Referring to FIGS. 6 and 7 , the lamp according to the fourth embodiment of the present invention also includes an outer cover 7 , an inner shell base 8 , a fan 3 , a heat sink 4 and a light emitting element 5 . Compared with the aforementioned first embodiment, the first flange 73 of the outer cover 7 of the fourth embodiment and the second flange 83 of the inner shell seat 8 are attached to each other, so that the second flange 83 is closed in the The first opening 72 of the housing 7 .

Spacers 74, 85 are provided between the outer cover 7 and the inner shell seat 8, and the spacers 74, 85 are respectively provided with a retaining wall on the inner peripheral wall of the first chamber 71 of the outer cover 7 and the outer surface of the inner shell seat 8. , the two retaining walls respectively butt against the inner peripheral wall of the first chamber 71 of the outer cover 7 and the outer surface of the inner shell seat 8 to support the space between the outer cover 7 and the inner shell seat 8 to form an air flow Channel A.

In this embodiment, the two spacers 74 , 85 in the form of retaining walls are attached to each other, and divide the airflow channel A into a first channel A1 and a second channel A2 . Wherein, the inner casing 8 also has a through hole 84 connected to the first channel A1 so that the first channel A1 can communicate with the second chamber 81 through the through hole 84 . The inner casing 8 is further provided with a plurality of slots 86 , each of which is connected to the second channel A2 , so that the second channel A2 can communicate with the second chamber 81 through each of the slots 86 . Furthermore, the second flange 83 of the inner housing base 8 is provided with several first air holes 87a and several second air holes 87b, each of the first air holes 87a is connected to the first channel A1, each of the second air holes The hole 87b connects the second channel A2.

When the fan 3 is in operation, the airflow can be driven to be inhaled through each of the first air holes 87a, and then pass through the first channel A1, the through hole 84, the second chamber 81, each of the through slots 86 and the second After passage A2, it is blown out by the second air holes 87b. Or when the fan 3 is controlled to run in the opposite direction, the airflow can be driven to inhale through each of the second air holes 87b in reverse, and then pass through the second passage A2, each of the through slots 86, the second chamber 81, the After the through hole 84 and the first channel A1 , air is blown out from each of the first air holes 87 a to dissipate heat from the light emitting element 5 .

Each of the first air holes 87a and the second air holes 87b can also be optionally disposed on the outer surface of the outer cover 7 adjacent to the first opening 72, and each of the first air holes 87a is also connected to the first channel A1, each of the The second air hole 87b is also connected to the second channel A2, and the fan 3 can also be used to drive the airflow to circulate along the path mentioned in the preceding paragraph.

Furthermore, a partition 88 can be added in the second chamber 81 of the inner shell seat 8, and the partition 88 divides the second chamber 81 into an upper chamber 81a and a lower chamber 81b, and the through-hole The hole 84 and each of the through grooves 86 communicate with the upper chamber 81a. The partition plate 88 has an installation hole 881 , and each light emitter 52 of the light emitting element 5 preferably faces the lower chamber 81 b through the installation hole 881 . The second opening 82 of the inner shell seat 8 can be further provided with a cover plate 89, and the cover plate 89 is preferably a transparent or opaque light-permeable plate body, so the luminous body 52 of the light-emitting element 5 or its chip will not Exposure to outside air to avoid accumulation of dust.

As mentioned above, when the outer cover of the lamp of the present invention is embedded above the ceiling, the air vents and the perforations are all located on the bottom of the ceiling, which can circulate smoothly with the outside air to improve the air circulation effect and heat dissipation performance.

The lamp of the present invention has better air circulation effect and heat dissipation performance, can smoothly remove the heat generated by each light-emitting element, and can prolong the service life of the lamp.

The lamp of the present invention can smoothly remove the heat generated by each light-emitting element, so as to avoid light decay caused by overheating of chips of each light-emitting element, without affecting the luminous efficiency of the lamp.

Claims (8)

1. A lamp, characterized in that it comprises: an outer cover, one end has a first opening, and a first chamber is recessed from the first opening; An inner shell seat has a second opening at one end, and a second chamber is recessed from the second opening, the inner shell seat is arranged in the first chamber, and the second opening faces the same direction as the first opening Direction, and there is a distance between the outer cover and the inner shell seat to form an airflow passage in the first chamber, and the inner shell seat is also provided with a through hole, which communicates the airflow passage in the first chamber and the second chamber. Second room; A fan is arranged adjacent to the through hole, the fan has two air flow sides, the two air flow sides suck in and blow out the air flow, and the air flow passes through the through hole; a radiator disposed in the second chamber, the radiator having a bottom plate with one side facing the fan; and a light emitting element is arranged in the second chamber and on the other side of the bottom plate; A spacer is provided between the outer cover and the inner shell seat, and the spacer is supported between the outer cover and the inner shell seat at intervals to form the air flow channel; A first flange extends outward from the periphery of the first opening, a second flange extends outward from the periphery of the second opening, and the first flange and the second flange are attached to each other, and the second flange The edge closes the first opening; the spacer is a retaining wall, and the retaining wall divides the airflow passage into a first passage and a second passage; the through hole communicates with the first passage and the second chamber, and The inner housing base is also provided with several slots, each of which communicates with the second channel and the second chamber; the second flange is provided with several first air holes and several second air holes, each of which is The air holes are connected to the first channel, and each of the second air holes is connected to the second channel. 2. A lamp, characterized by comprising: an outer cover, one end has a first opening, and a first chamber is recessed from the first opening; An inner shell seat has a second opening at one end, and a second chamber is recessed from the second opening, the inner shell seat is arranged in the first chamber, and the second opening faces the same direction as the first opening Direction, and there is a distance between the outer cover and the inner shell seat to form an airflow passage in the first chamber, and the inner shell seat is also provided with a through hole, which communicates the airflow passage in the first chamber and the second chamber. Second room; A fan is arranged adjacent to the through hole, the fan has two air flow sides, the two air flow sides suck in and blow out the air flow, and the air flow passes through the through hole; a radiator disposed in the second chamber, the radiator having a bottom plate with one side facing the fan; and a light emitting element is arranged in the second chamber and on the other side of the bottom plate; The inner diameter of the second opening is smaller than the inner diameter of the first opening, and when the second opening is aligned with the first opening, the second opening is located within the range of the first opening; A first flange extends outward from the periphery of the first opening, a second flange extends outward from the periphery of the second opening, and the first flange and the second flange are attached to each other, and the second flange The edge closes the first opening; a spacer is provided between the outer cover and the inner shell seat, and the spacer is a retaining wall, and the retaining wall divides the air flow channel into a first channel and a second channel; The through hole communicates with the first channel and the second chamber, and the inner housing is provided with several through grooves, each of which communicates with the second passage and the second chamber; the second flange is provided with several first An air hole and several second air holes, each of the first air holes is connected to the first channel, and each of the second air holes is connected to the second channel. 3. The lamp according to claim 1 or 2, wherein one of the two airflow sides is connected to the airflow channel, and the other is connected to the second chamber. 4. The lamp according to claim 3, wherein the heat sink is disposed in the second chamber, and the bottom plate of the heat sink faces the air flow side of the fan connected to the second chamber. 5. The lamp according to claim 1 or 2, wherein the light-emitting element has a substrate and several illuminants, each of the illuminants is arranged on one side of the substrate, and the other side of the substrate is arranged on the heat sink bottom plate. 6. The lamp according to claim 1 or 2, wherein a partition is provided in the second chamber, and the partition divides the second chamber into an upper chamber and a lower chamber, The through hole and each of the through grooves communicate with the upper chamber. 7. The lamp according to claim 6, wherein the partition plate has an installation hole, and the light-emitting element is disposed in the installation hole and faces the lower chamber. 8. The lamp according to claim 7, characterized in that: the second opening is provided with a cover plate.

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