CN219063180U - Blackboard lamp - Google Patents

Abstract

The utility model discloses a blackboard lamp, comprising: the lamp housing is provided with an opening inclined downward cavity, the lamp housing is provided with a light-emitting component, an optical lens, a honeycomb net grid and a light-transmitting plate, the light-emitting component, the optical lens, the honeycomb net grid and the light-transmitting plate are sequentially arranged from the bottom wall of the cavity towards the opening of the cavity, the light-transmitting plate is used for closing the opening of the cavity, the honeycomb net grid is provided with a plurality of light path channels perpendicular to the light-transmitting plate, the optical lens is used for scattering light rays emitted by the light-emitting component, and the light path channels can specularly reflect the light rays passing through the optical lens and emit the light rays in a preset angle range. The output end of the light-emitting component of the blackboard lamp is obliquely downwards arranged, light enters the honeycomb net grating after being scattered by the optical lens, is subjected to specular reflection by the inner side wall of the light path channel, then passes through the light-transmitting plate and is projected to the middle lower part of the blackboard, the intensity of the light emitted from the light path channel is higher, the light attenuation is small, the light can be emitted in a preset angle, the anti-glare effect is achieved, and the illumination is uniform, so that teachers can conduct teaching work.

Description

Blackboard lamp

Technical Field

The utility model relates to the technical field of illumination, in particular to a blackboard lamp.

Background

In classroom illumination, there are stringent requirements for the illuminance, uniformity, installation angle, etc. of blackboard lamps. In order to reduce the influence of the glare of the blackboard lamp on the teacher, the installation angle of the blackboard lamp is generally adjusted to prevent the emergent light rays of the blackboard lamp from facing the eyes of the teacher, however, the problem of the glare is difficult to be perfectly solved by simply relying on the adjustment of the installation angle.

In addition, according to the installation requirement of national standards on blackboard lamps, a hanging rod installation mode is adopted, the lamps are installed parallel to the blackboard, the parallel distance d between the lamps and the blackboard is 700-1000 mm, and the vertical distance h between the lamps and the upper edge of the blackboard is 100-200 mm. When chalk is consumed, corresponding powder is generated, and the powder can be adhered to the surface of the light-transmitting plate of the blackboard lamp, however, the powder is accumulated more because the installation position of the blackboard lamp is inconvenient for cleaning the powder, so that the illuminance and uniformity of the blackboard lamp are affected.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the anti-glare blackboard lamp with uniform illumination.

According to an embodiment of the utility model, a blackboard lamp comprises: the lamp housing is provided with an opening inclined downward cavity, the lamp housing is provided with a light emitting assembly, an optical lens, a honeycomb net grid and a light-transmitting plate, wherein the light emitting assembly, the optical lens, the honeycomb net grid and the light-transmitting plate are sequentially arranged from the bottom wall of the cavity towards the opening of the cavity, the light-transmitting plate is used for closing the opening of the cavity, the honeycomb net grid is provided with a plurality of light path channels perpendicular to the light-transmitting plate, the optical lens is used for scattering light rays emitted by the light emitting assembly, and the light path channels can specularly reflect the light rays passing through the optical lens and emit the light rays in a preset angle range so that the light rays penetrate through the light-transmitting plate and are projected on the middle lower part of the blackboard.

The blackboard lamp provided by the embodiment of the utility model has at least the following beneficial effects:

the output end of the light-emitting component of the blackboard lamp is obliquely downwards arranged, light emitted by the light-emitting component enters the honeycomb net grating after being scattered by the optical lens, the light is subjected to specular reflection by the inner side wall of the light path channel, the intensity of the light emitted from the light path channel is high, the light attenuation is small, the light can be emitted in a preset angle, the anti-glare effect is achieved, the light sequentially passes through the optical lens, the honeycomb net grating and the light-transmitting plate and then is projected to the middle lower part of the blackboard, and illumination is uniform so that teachers can conveniently carry out teaching work.

In some embodiments of the present utility model, the housing is formed by a strip-shaped section, the cavity extends along a length direction of the housing, a first baffle is disposed on one side of an opening of the cavity away from the blackboard, the housing is disposed on the other side of the opening of the cavity, a second baffle is disposed on the other side of the opening of the housing, a downward extending distance of the first baffle is greater than a downward extending distance of the second baffle, an acute angle light exit area is defined between the first baffle, the light-transmitting plate and the second baffle, a first embedding groove for installing the optical lens and a second embedding groove for installing the light-transmitting plate are disposed on an inner side wall of the cavity, the optical lens has a light-transmitting flat plate portion, and the cellular grid is disposed in parallel between the light-transmitting flat plate portion and the light-transmitting plate.

In some embodiments of the present utility model, the honeycomb mesh grille has a plurality of hexagonal surrounding frames, the internal channels of the hexagonal surrounding frames form the light path channels, the honeycomb mesh grille is sandwiched between the light-transmitting flat plate portion and the light-transmitting plate, the light-transmitting flat plate portion or the light-transmitting plate is provided with positioning slots in a honeycomb shape, the positioning slots include a plurality of hexagonal slots corresponding to the hexagonal surrounding frames one to one, and the hexagonal surrounding frame portions extend into the hexagonal slots to limit the adjacent hexagonal surrounding frames to relatively move.

In some embodiments of the present utility model, an end face of the honeycomb mesh grid on one side close to the light-transmitting flat plate portion is parallel to the light-transmitting flat plate portion, and in a width direction of the light-transmitting plate, the end face of the honeycomb mesh grid on one side toward the light-transmitting plate is gradually distant from the light-transmitting flat plate portion from a middle portion of the honeycomb mesh grid toward a direction close to the second baffle plate.

In some embodiments of the present utility model, a sealing cavity is defined between the lamp housing and the light-transmitting plate, the light-emitting component, the optical lens and the honeycomb mesh grid are all located in the sealing cavity, the lamp housing is provided with a blowing channel communicated with the sealing cavity, an output end of the blowing channel faces to an outer surface of the light-transmitting plate, the blowing channel is connected with a pressure release valve for controlling on-off of the blowing channel, and the lamp housing is provided with a one-way valve for supplementing gas to the sealing cavity.

In some embodiments of the present utility model, the lamp housing is provided with a strip-shaped air knife main body at one side edge of the light-transmitting plate, the air knife main body is extended along the length direction of the light-transmitting plate, the air blowing channel includes a plurality of unit air outlet channels which are arranged at intervals along the length direction of the air knife main body, and the pressure release valve can communicate or isolate the sealing cavity with all the unit air outlet channels.

In some embodiments of the present utility model, the optical lens has a light-transmitting flat plate portion capable of dividing the cavity into a first unit cavity and a second unit cavity independent from each other, the second unit cavity is communicated with the first unit cavity through a communication hole, the light emitting component is located in the first unit cavity, and the pressure relief valve and the air blowing channel are located in the second unit cavity.

In some embodiments of the present utility model, a temperature sensing module is disposed in the sealing cavity, the temperature sensing module is electrically connected with a controller, an exhaust port communicated with the sealing cavity is disposed on a side wall of the lamp housing, the lamp housing is provided with an electromagnetic valve for sealing or opening the exhaust port, and the electromagnetic valve is electrically connected with the controller.

In some embodiments of the present utility model, the lamp housing is rotatably provided with a prism located in the cavity, the prism extends along a length direction of the lamp housing, the light emitting component includes a plurality of lamp bead groups respectively arranged on each side wall of the prism, light emitting powers of the plurality of lamp bead groups are different from each other, two ends of the lamp bead groups are respectively provided with an electric connection terminal, two electric connection terminals capable of contacting with the electric connection terminals to conduct the lamp bead groups are arranged on the lamp housing, and the prism can rotate to an incident end of one of the lamp bead groups facing the optical lens.

In some embodiments of the present utility model, the lamp housing is rotatably provided with a circular sleeve sleeved outside the prism, a rotation shaft of the circular sleeve is coaxial with the rotation shaft of the prism, a gap is formed between the circular sleeve and the prism, a through hole extending along a length direction of the circular sleeve is formed in a side wall of the circular sleeve, at least two arc-shaped light transmitting sheets are arranged on the circular sleeve around a circumference of the rotation shaft of the circular sleeve, and light transmittance of each arc-shaped light transmitting sheet is gradually increased or gradually decreased around a clockwise direction.

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

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic exploded view of one embodiment of a blackboard lamp of the present utility model;

FIG. 2 is a schematic cross-sectional view of one embodiment of a blackboard lamp of the present utility model;

FIG. 3 is an enlarged partial schematic view of portion A of FIG. 2;

FIG. 4 is an enlarged partial schematic view of portion B of FIG. 2;

FIG. 5 is a schematic side view of one embodiment of a cellular network grid of the blackboard lamp of the present utility model;

FIG. 6 is a schematic view showing an internal structure of an embodiment of an air knife body of the blackboard lamp of the present utility model;

fig. 7 is a schematic view of an embodiment of a combination of a prism and a circular sleeve.

Reference numerals:

a lamp housing 100; a seal chamber 101; a perforation 102; a first baffle 110; a second baffle 120; a first fitting groove 130; a second fitting groove 140;

a light emitting assembly 200;

an optical lens 300; a light-transmitting flat plate portion 310;

a honeycomb mesh grid 400; an optical path channel 410;

a light-transmitting plate 500;

a blowing passage 600; a cell outlet channel 610; an air knife body 620; a manifold port 630;

a pressure relief valve 700;

a one-way valve 800; a post 810; sealing plug 820; an arc-shaped convex portion 821; an anti-drop head 830; a spring 840;

a prism 910; a lamp bead set 920; a power terminal 930; a conductive terminal 940; an annular sleeve 950; a through-hole 951; an arc light transmitting sheet 952;

a first cell cavity 1011; a second cell cavity 1012.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

At present, in classroom illumination, the main problems of the blackboard lamp are focused on illuminance, uniformity and anti-dazzle capability, in the prior art, the method for solving the general anti-dazzle problem is mainly to adjust the light angle of the blackboard lamp so as to avoid direct irradiation of eyes of teachers, and further, in order to prevent light from being too dazzling, a sub-power panel with a diffuse reflection layer or a frosted structure is further arranged in some blackboard lamps. Only the anti-dazzle effect of adjusting the light angle of the blackboard lamp is poor, and the addition of the acrylic plate with the diffuse reflection layer or the frosted structure has larger adverse effects on illuminance and uniformity.

Referring to fig. 1 and 2, a blackboard lamp of the present utility model includes: the lamp housing 100, the lamp housing 100 is equipped with the opening slope downward holds the chamber 103, the lamp housing 100 is equipped with from holding the diapire in chamber 103 towards holding the opening in chamber 103 and arranges luminous subassembly 200, optical lens 300, honeycomb net grid 400 and light-transmitting plate 500 in proper order, the light-transmitting plate 500 is used for closing holding the opening in chamber 103, honeycomb net grid 400 has a plurality of light path passageway 410 of perpendicular to light-transmitting plate 500, optical lens 300 is used for scattering the light that luminous subassembly 200 sent in order to enlarge the scope that the light shines, light path passageway 410 can specular reflection pass through optical lens 300 and at predetermineeing the angle within range light, so that light sees through the light-transmitting plate 500 rear projection in the middle lower part of blackboard.

The output end of the light emitting component 200 of the blackboard lamp is obliquely downwards arranged, and the blackboard lamp is arranged above the blackboard obliquely due to the requirement of the installation standard of the blackboard lamp, the output end of the light emitting component 200 is obliquely downwards arranged to project light towards the direction of the blackboard, the light emitted by the light emitting component 200 enters the honeycomb net grid 400 after being scattered by the optical lens 300, the inner side wall of the light path channel 410 is used for carrying out specular reflection on the light, the intensity of the light emitted from the light path channel 410 is higher, the light attenuation is small, the light can be emitted in a preset angle, the anti-glare effect is achieved, and the light sequentially passes through the optical lens 300, the honeycomb net grid 400 and the light transmitting plate 500 and then is projected to the middle lower part of the blackboard, so that the light is uniform in illumination, and the teacher can conveniently carry out teaching work. In some practical application scenes, the blackboard area used by a teacher for writing on the blackboard is limited, most of the blackboard area is concentrated at the middle lower part of the blackboard, the emergent light rays are concentrated at the middle lower part of the blackboard, high illuminance is ensured, and in teaching work, the blackboard capable of lifting and sliding can be adopted to be matched with the blackboard lamp. And the blackboard lamp concentrates the emergent light rays at the middle lower part of the blackboard, so that the direct irradiation of eyes of a teacher can be avoided, the emergent angle of the light rays is limited by matching with the plurality of light path channels 410 of the honeycomb net grid 400, and the softness of the light rays is improved.

In this embodiment, in order to ensure that the inner wall of the optical path channel 410 of the honeycomb mesh grid 400 can form good specular reflection, the honeycomb mesh grid 400 is formed by a metal sheet with a smooth surface, so as to further improve the specular reflection capability of the optical path channel 410, reduce the generation of diffuse reflection, improve the light energy utilization efficiency, and the surface of the honeycomb mesh grid 400 is adhered with a specular reflection coating.

Referring to fig. 1 and 2, in some embodiments of the present utility model, a lamp housing 100 is formed by a strip-shaped section, a cavity 103 is extended along a length direction of the lamp housing 100, a first baffle 110 is disposed on one side of an opening of the cavity 103 away from a blackboard, a second baffle 120 is disposed on the other side of the opening of the cavity 103, the first baffle 110 extends downward by a distance greater than that of the second baffle 120, an acute angle light exit area is defined between the first baffle 110, a light-transmitting plate 500 and the second baffle 120, a first insertion groove 130 for mounting an optical lens 300 and a second insertion groove 140 for mounting the light-transmitting plate 500 are disposed on an inner side wall of the cavity 103 of the lamp housing 100, the optical lens 300 has a light-transmitting flat plate portion 310, and a cellular grid 400 is disposed in parallel between the light-transmitting flat plate portion 310 and the light-transmitting plate 500. It can be appreciated that the lamp housing 100 formed by the strip-shaped section is lighter, and when the blackboard lamp is installed in a hoisting manner, the hoisting load can be reduced, so that the blackboard lamp is favorable for being used stably for a long time. The first baffle 110 far away from the blackboard is used for preventing light from being emitted towards the direction of a student seat in the classroom, so that glare effect is avoided for students, the second baffle 120 close to the blackboard is used for limiting the upper edge position where the light can be irradiated, and the first baffle 110, the light-transmitting plate 500 and the second baffle 120 jointly form a light emitting area which is emergent at an acute angle, so that light spots in a preset shape are formed on the blackboard. In addition, the strip-shaped material can form the first embedded groove 130 and the second embedded groove 140 in the process of extrusion molding into the lamp housing 100, so that the production and the processing are very convenient. The optical lens 300 is inserted into the first insertion groove 130 and the light-transmitting plate 500 is inserted into the second insertion groove 140, which helps to improve assembly efficiency, and reduce cost without using other fastening structures.

Referring to fig. 1 and 2, in some embodiments of the present utility model, the honeycomb screen 400 has a plurality of hexagonal surrounding frames, the internal channels of the hexagonal surrounding frames form the light path channels 410, the honeycomb screen 400 is sandwiched between the light-transmitting flat plate portion 310 and the light-transmitting plate 500, the light-transmitting flat plate portion 310 or the light-transmitting plate 500 is provided with positioning slots in a honeycomb shape, the positioning slots include a plurality of hexagonal slots corresponding to the hexagonal surrounding frames one to one, and the hexagonal surrounding frame portions extend into the hexagonal slots to limit the relative movement of the adjacent hexagonal surrounding frames. It should be noted that, when the cellular grid 400 is disposed between the light-transmitting flat plate portion 310 and the light-transmitting plate 500, in order to limit or fix the cellular grid 400, at this time, the contour edge of the cellular grid 400 needs to be in contact with the lamp housing 100, when the contour edge of the cellular grid 400 is stressed or under the action of gravity in the middle of the cellular grid 400, each hexagonal enclosure frame on the cellular grid 400 may deform to different degrees, which may cause light to be emitted according to a preset angle, and also may not reach a preset illuminance and uniformity, thereby affecting the performance of the blackboard lamp. In this embodiment, the positioning slots are formed in the inner surface of the light-transmitting plate 500, the light-transmitting plate 500 has a supporting effect on the honeycomb mesh grid 400, and the plurality of hexagonal slots of the positioning slots respectively position and fix the plurality of hexagonal surrounding frames of the honeycomb mesh grid 400, so that the hexagonal surrounding frames cannot deform, the shape and the size and the position of the light path channel 410 are stable at the preset positions, and the light emitting effect of the blackboard lamp is ensured.

Referring to fig. 2 and 5, in some embodiments of the present utility model, a side end surface of the honeycomb screen 400 adjacent to the light-transmitting flat plate portion 310 is parallel to the light-transmitting flat plate portion 310, and in the width direction of the light-transmitting plate 500, the side end surface of the honeycomb screen 400 facing the light-transmitting plate 500 is gradually distant from the light-transmitting flat plate portion 310 from the middle of the honeycomb screen 400 toward the direction approaching the second barrier 120. It should be noted that, if the light emitting component 200 emits a large amount of light beams with similar light intensity to the honeycomb mesh grid 400 and parallel to the light path channel 410 after being refracted by the optical lens 300, since the parallel distance d between the blackboard lamp and the blackboard is only 700 mm-1000 mm, the light beam is stronger in light intensity projected on the blackboard after passing through the portion of the honeycomb mesh grid 400 near the first baffle 110, and the side end surface of the honeycomb mesh grid 400 facing the light-transmitting plate 500 gradually gets far from the light-transmitting flat plate portion 310 from the middle of the honeycomb mesh grid 400 toward the direction near the second baffle 120, i.e. the depth dimension of the hexagonal enclosure frame gradually increases from the middle of the honeycomb mesh grid 400 toward both sides of the width direction of the light-transmitting plate 500, so as to weaken the intensity of the light beam passing through the portion of the honeycomb mesh grid 400 near the first baffle 110.

Referring to fig. 2, 3 and 4, during the use of the blackboard lamp, since the blackboard lamp approaches the blackboard, a great amount of powder is generated after a teacher uses chalk, and the powder floats in the air and then adheres to the outer surface of the light-transmitting plate 500, and after a long time of accumulation, the powder adhering to the outer surface of the light-transmitting plate 500 affects the light transmittance of the light-transmitting plate 500, thereby adversely affecting the illuminance and uniformity of the blackboard lamp. In some embodiments of the present utility model, a sealed cavity 101 is enclosed between the lamp housing 100 and the light-transmitting plate 500, the light-emitting component 200, the optical lens 300 and the honeycomb grid 400 are all located in the sealed cavity 101, the lamp housing 100 is provided with a blowing channel 600 communicated with the sealed cavity 101, an output end of the blowing channel 600 faces to an outer surface of the light-transmitting plate 500, the blowing channel 600 is connected with a pressure release valve 700 for controlling on-off of the blowing channel 600, and the lamp housing 100 is provided with a one-way valve 800 for supplementing gas to the sealed cavity 101.

It will be appreciated that the light emitting assembly 200 emits light while generating a large amount of heat, the heat emitted in the sealing chamber 101 heats the air in the sealing chamber 101 to raise the air pressure in the sealing chamber 101, the air in the sealing chamber 101 becomes high pressure air, when the air pressure in the sealing chamber 101 reaches the working value set by the pressure relief valve 700, the pressure relief valve 700 communicates the air blowing channel 600 with the sealing chamber 101, and the high pressure air is output from the air blowing channel 600 to remove part of dust located on the outer surface of the light transmitting plate 500. When the blackboard lamp does not work, for example, after noon break or school, the whole blackboard lamp is cooled down, the air in the sealing cavity 101 expands with heat and contracts with cold, so that the air pressure in the sealing cavity 101 is reduced to be lower than the external atmospheric pressure, at the moment, the one-way valve 800 can be opened, the external air enters the sealing cavity 101 until the air pressure in the sealing cavity 101 is consistent with the atmospheric pressure, and the one-way valve 800 can reseal the sealing cavity 101. When the blackboard lamp is turned on again for a period of time, air in the sealing cavity 101 is heated and expands, after the air pressure value in the sealing cavity 101 reaches the working value set by the pressure relief valve 700, the pressure relief valve 700 is used for communicating the air blowing channel 600 with the sealing cavity 101, and high-pressure air is output from the air blowing channel 600 to remove dust.

Referring to fig. 4, in this embodiment, the check valve 800 includes a post 810 movably penetrating through a sidewall of the lamp housing 100, the sidewall of the lamp housing 100 is provided with a through hole 102 matching with the post 810, one end of the post 810 extends into the sealing cavity 101, the other end of the post 810 extends out of the lamp housing 100, one end of the post 810 extending into the sealing cavity 101 is provided with a sealing plug 820 made of a flexible material, a joint between the sealing plug 820 and the post 810 is provided with an arc protrusion 821, at least part of the arc protrusion 821 enters the through hole 102 to improve the sealing effect, one end of the post 810 extending out of the lamp housing 100 is provided with an anti-release head 830, and the post 810 is penetrated with a spring 840 propped between the anti-release head 830 and an outer wall of the lamp housing 100.

The contour edge of the light-transmitting plate 500 is adhered to the opening of the cavity 103 of the lamp housing 100 by sealant, or the contour edge of the light-transmitting plate 500 is in contact with the opening edge of the cavity 103 of the lamp housing 100 by a tight-fitting sealing gasket, so that the sealed cavity 101 with good sealing performance is formed.

Referring to fig. 6, in some embodiments of the present utility model, the lamp housing 100 is provided with an elongated air knife body 620 at one side of the light-transmitting plate 500, the air knife body 620 is extended along the length direction of the light-transmitting plate 500, the air blowing channel 600 includes a plurality of unit air outlet channels 610 spaced along the length direction of the air knife body 620, and the pressure release valve 700 can connect or isolate the sealed cavity 101 and all the unit air outlet channels 610. It will be appreciated that air knife body 620 has a manifold port 630 in communication with all of the cell outlet channels 610, and that pressure relief valve 700 is provided at this manifold port 630 to control the communication of seal chamber 101 with cell outlet channels 610 or to control the isolation of seal chamber 101 from cell outlet channels 610. When the air in the sealing cavity 101 is heated and expanded to reach the working value set by the pressure relief valve 700, the pressure relief valve 700 is opened, and the high-pressure gas in the sealing cavity 101 is discharged from the plurality of unit air outlet channels 610 after entering from the confluence pipe orifice, and because the plurality of unit air outlet channels 610 are arranged at intervals along the length direction of the air knife main body 620, the length direction of the air knife main body 620 is consistent with the length direction of the light-transmitting plate 500, dust can be cleaned at different positions on the length direction of the light-transmitting plate 500 through the structure.

Preferably, the exhaust end of the unit gas outlet channel 610 has a showerhead capable of diffusing a fluid, and the working ranges of the showerhead of two adjacent unit gas outlet channels 610 have overlapping portions so that each position of the outer surface of the light-transmitting plate 500 can be cleaned.

Referring to fig. 2, in some embodiments of the present utility model, the optical lens 300 has a light-transmitting flat plate portion 310, the light-transmitting flat plate portion 310 is capable of dividing the cavity 103 into a first unit cavity 1011 and a second unit cavity 1012 which are independent from each other, the second unit cavity 1012 is communicated with the first unit cavity 1011 through a communication hole, the light emitting assembly 200 is located in the first unit cavity 1011, and the pressure release valve 700 and the air blowing channel 600 are located in the second unit cavity 1012. It should be noted that, the edge of the light-transmitting flat plate portion 310 is connected with the inner wall of the cavity 103 in a sealing manner, so that the first unit cavity 1011 and the second unit cavity 1012 are formed independently, when the light-emitting assembly 200 is located in the first unit cavity 1011, the heat generated by the light-emitting assembly 200 is helpful to rapidly heat the air in the first unit cavity 1011, so that the air pressure is beneficial to rapidly rising, and the high-temperature and high-pressure air in the first unit cavity 1011 can flow from the communication hole to the second unit cavity 1012, so as to supply air for the air blowing channel 600.

In some embodiments of the present utility model, a temperature sensing module is disposed in the sealing cavity 101, the temperature sensing module is electrically connected to a controller, a side wall of the lamp housing 100 is provided with an air outlet communicated with the sealing cavity 101, the lamp housing 100 is provided with an electromagnetic valve for sealing or opening the air outlet, and the electromagnetic valve is electrically connected to the controller. It should be noted that, in order to avoid the situation that the light emitting assembly 200 is damaged due to the too high temperature of the air in the sealing cavity 101, when the temperature in the sealing cavity 101 is close to the temperature resistance value of the light emitting assembly 200, the controller may control the electromagnetic valve to be opened to release air, so as to help the sealing cavity 101 to quickly cool down, so as to ensure the service life of the light emitting assembly 200.

Referring to fig. 7, in some embodiments of the present utility model, the lamp housing 100 is rotatably provided with a prism 910 disposed in the cavity 103, the prism 910 is extended along a length direction of the lamp housing 100, the light emitting assembly 200 includes a plurality of lamp bead groups 920 respectively disposed on respective sidewalls of the prism 910, light emitting powers of the plurality of lamp bead groups 920 are different from each other, two electrical terminals 930 are respectively disposed at two ends of the prism 910 of the lamp bead groups 920, two conductive terminals 940 capable of contacting with the electrical terminals 930 to conduct the lamp bead groups 920 are disposed on the lamp housing 100, and the prism 910 can be rotated until one of the lamp bead groups 920 faces an incident end of the optical lens 300. It should be noted that, under the condition that the environmental brightness is different, the required illuminance that sends of blackboard lamp is different, for example, under the cloudy environment, the blackboard lamp needs to provide higher illuminance to guarantee that the picture and text information on the blackboard can be seen clearly, otherwise, under the sunny environment, too high illuminance can make the student produce tired feeling after watching blackboard for a period of time again. Therefore, the above structure adjusts the illuminance of the blackboard lamp according to specific needs by driving the prism 910 to rotate so that any one of the lamp bead groups 920 faces the incident end of the optical lens 300.

Referring to fig. 7, in the present embodiment, the prism 910 is a quadrangular prism, and the four sides of the quadrangular prism are respectively provided with a first light set, a second light set, a third light set and a fourth light set, where the power of the first light set, the second light set, the third light set and the fourth light set sequentially increases. The two ends of the prism 910 are provided with pivots rotatably provided on the lamp housing 100, and the pivots are provided with motors or knob members, so that any one of the first lamp set, the second lamp set, the third lamp set and the fourth lamp set faces the incident end of the optical lens 300 by manually rotating the knob members by 90 ° or driving the pivots by 90 ° by the motors. Taking the first lamp set as an example, the first lamp set includes a plurality of first lamp beads connected in series, two ends of the prism 910 of the first lamp set are respectively connected with an electrical connection terminal 930, the conductive terminal 940 on the lamp housing 100 is a metal elastic sheet elastically leaning against the corresponding electrical connection terminal 930, when the prism 910 rotates 90 degrees, the second lamp set faces the incident end of the optical lens 300, and the metal elastic sheet is switched to elastically leaning against the electrical connection terminal 930 of the second lamp set, so as to realize electrical conduction of different lamp bead sets 920.

In addition, the light emitting assembly 200 may employ LED lamps, fluorescent tubes, bulbs, etc., and a certain degree of light decay is inevitably generated in any type of light emitting assembly 200. With the above structure, different lamp bead groups 920 can be switched and used, and the service life is prolonged.

Referring to fig. 7, in some embodiments of the present utility model, a circular sleeve 950 sleeved outside a prism 910 is rotatably disposed on a lamp housing 100, a rotation axis of the circular sleeve 950 is coaxial with a rotation axis of the prism 910, a gap is formed between the circular sleeve 950 and the prism 910, a through hole 951 extending along a length direction of the circular sleeve 950 is disposed on a side wall of the circular sleeve 950, at least two arc-shaped light transmitting sheets 952 are disposed on the circular sleeve 950 around a rotation axis circumference of the circular sleeve, and a light transmittance of each arc-shaped light transmitting sheet 952 is gradually increased or gradually decreased around a clockwise direction. In this embodiment, three arc-shaped light-transmitting sheets 952 are provided, the light transmittance of the three arc-shaped light-transmitting sheets 952 is sequentially set to 90%, 80% and 70%, the light transmittance of the through-hole 951 is 100%, and the circumferential areas occupied by the through-hole 951 and the three arc-shaped light-transmitting sheets 952 are the same. The two ends of the circular sleeve 950 are respectively provided with a shaft sleeve, and the pivots at the two ends of the prism 910 are respectively correspondingly penetrated through the two shaft sleeves, so that the rotating shaft of the circular sleeve 950 is coaxial with the rotating shaft of the prism 910, and likewise, a motor or a knob member is arranged on the shaft sleeve, and the rotation of the circular sleeve 950 can be realized by the rotation of the motor-driven shaft sleeve through manual rotation of the knob member, so that the penetrating through hole 951 or different arc-shaped light-transmitting sheets 952 are respectively combined with different lamp bead groups 920 to realize different illuminance. For example, the powers of the first lamp group, the second lamp group, the third lamp group and the fourth lamp group are set to be a,1.2a,1.4a and 1.6A, and when any one of the first lamp group, the second lamp group, the third lamp group and the fourth lamp group is combined with the through hole 951 or the arc-shaped light transmitting sheet 952 with different light transmittance, illuminance with 16 gears can be formed, the number of the arc-shaped light transmitting sheets 952 can be increased, and the number of the lamp bead groups 920 can be increased according to specific use requirements, so that the electrodeless dimming effect is achieved.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A blackboard lamp, comprising:

the lamp body (100), lamp body (100) are equipped with opening slope decurrent appearance chamber (103), lamp body (100) are equipped with from the diapire of appearance chamber (103) is towards the opening of appearance chamber (103) is arranged luminous subassembly (200), optical lens (300), honeycomb net grid (400) and light-transmitting plate (500) in proper order, light-transmitting plate (500) are used for the closure hold the opening of chamber (103), honeycomb net grid (400) have a plurality of perpendicular to light path passageway (410) of light-transmitting plate (500), optical lens (300) are used for the scattering luminous subassembly (200) outgoing light, light path passageway (410) can specular reflection pass through optical lens (300) light and in predetermine the angle within range outgoing light, so that light is permeating light-transmitting plate (500) rear projection in the middle lower part of blackboard.

2. A blackboard lamp according to claim 1, characterized in that:

the lamp housing (100) comprises long strip section bars, hold chamber (103) along the length direction of lamp housing (100) extends and sets up, lamp housing (100) in hold chamber (103)'s opening is kept away from one side of blackboard and is equipped with first baffle (110), lamp housing (100) in hold chamber (103) open-ended opposite side is equipped with second baffle (120), first baffle (110) downwardly extending distance is greater than second baffle (120) downwardly extending distance, first baffle (110) light-transmitting plate (500) with limit up sharp angle's light exit area between second baffle (120), lamp housing (100) in hold chamber (103) inside wall be equipped with be used for installing first inlay groove (130) of optical lens (300) and be used for installing light-transmitting plate (500) inlay groove (140), optical lens (300) have light-transmitting flat plate portion (310), honeycomb grid (400) are parallel to be located between light-transmitting flat plate portion (310) and light-transmitting plate (500).

3. A blackboard lamp according to claim 2, characterized in that:

the honeycomb net grille (400) is provided with a plurality of hexagonal enclosing frames, the inner channels of the hexagonal enclosing frames form the light path channels (410), the honeycomb net grille (400) is clamped between the light-transmitting flat plate portion (310) and the light-transmitting plate (500), the light-transmitting flat plate portion (310) or the light-transmitting plate (500) is provided with honeycomb-shaped positioning slots, each positioning slot comprises a plurality of hexagonal slots corresponding to the hexagonal enclosing frames one to one, and the hexagonal enclosing frame portions extend into the hexagonal slots to limit the adjacent hexagonal enclosing frames to move relatively.

4. A blackboard lamp according to claim 2, characterized in that:

the end face of one side of the honeycomb net grid (400) close to the light-transmitting flat plate part (310) is parallel to the light-transmitting flat plate part (310), and in the width direction of the light-transmitting plate (500), the honeycomb net grid (400) is gradually far away from the light-transmitting flat plate part (310) from the middle part of the honeycomb net grid (400) towards the direction close to the second baffle plate (120) towards the end face of one side of the light-transmitting plate (500).

5. A blackboard lamp according to claim 1, characterized in that:

enclose sealed chamber (101) between lamp body (100) with light-passing board (500), luminous subassembly (200) optical lens (300) honeycomb net grid (400) all are located within sealed chamber (101), lamp body (100) be equipped with sealed chamber (101) be linked together blow passageway (600), blow passageway (600) output orientation light-passing board (500) surface, blow passageway (600) are connected with relief valve (700) of its break-make of control, be equipped with on lamp body (100) be used for right sealed chamber (101) make-up gaseous check valve (800).

6. A blackboard lamp according to claim 5, characterized in that:

the lamp housing (100) is provided with a strip-shaped air knife main body (620) on one side edge of the light-transmitting plate (500), the air knife main body (620) extends along the length direction of the light-transmitting plate (500), the air blowing channel (600) comprises a plurality of unit air outlet channels (610) which are arranged at intervals along the length direction of the air knife main body (620), and the pressure relief valve (700) can be used for connecting or isolating the sealing cavity (101) with all the unit air outlet channels (610).

7. A blackboard lamp according to claim 6, characterized in that:

the optical lens (300) is provided with a light-transmitting flat plate part (310), the light-transmitting flat plate part (310) can divide the accommodating cavity (103) into a first unit cavity (1011) and a second unit cavity (1012) which are mutually independent, the second unit cavity (1012) is communicated with the first unit cavity (1011) through a communication hole, the light-emitting component (200) is positioned in the first unit cavity (1011), and the pressure relief valve (700) and the air blowing channel (600) are positioned in the second unit cavity (1012).

8. A blackboard lamp according to claim 6 or 7, characterized in that:

the sealing cavity (101) is internally provided with a temperature sensing module, the temperature sensing module is electrically connected with a controller, the side wall of the lamp housing (100) is provided with an exhaust port communicated with the sealing cavity (101), the lamp housing (100) is provided with an electromagnetic valve for sealing or opening the exhaust port, and the electromagnetic valve is electrically connected with the controller.

9. A blackboard lamp according to claim 1, characterized in that:

the lamp body (100) rotates and is provided with prism (910) that are located in holding chamber (103), prism (910) are followed the length direction of lamp body (100) extends and sets up, light-emitting component (200) include a plurality of arrange respectively in lamp pearl group (920) on each lateral wall of prism (910), a plurality of lamp pearl group (920) luminous power each other is different, lamp pearl group (920) in the both ends of prism (910) are equipped with one respectively and connect electric terminal (930), be equipped with on lamp body (100) two can with connect electric terminal (930) contact with switch on conductive terminal (940) of lamp pearl group (920), prism (910) can rotate to one of them lamp pearl group (920) orientation optical lens (300) incident end.

10. A blackboard lamp according to claim 9, characterized in that:

the lamp housing (100) rotates and is provided with a circular sleeve (950) sleeved outside the prism (910), a rotating shaft of the circular sleeve (950) is coaxial with a rotating shaft of the prism (910), a gap is reserved between the circular sleeve (950) and the prism (910), a through hole (951) extending and arranged along the length direction of the circular sleeve is formed in the side wall of the circular sleeve (950), at least two arc-shaped light-transmitting sheets (952) are arranged on the circular sleeve (950) around the circumference of the rotating shaft of the circular sleeve, and the light transmittance of each arc-shaped light-transmitting sheet (952) is gradually increased or gradually reduced around the clockwise direction.

Images