Flat metal shell and dust sensor thereof

Abstract

The utility model relates to a flat metal shell and a dust sensor thereof. The main body is flat-plate-shaped; a downward elastic pressing plate is arranged at the bottom of the flat metal shell; the elastic pressing plate comprises a horizontal section and an inclined section which are connected; and the inclined section is connected with the horizontal section and the flat metal shell main body. The device further comprises a detection box body and a circuit board. The outer wall horizontal section of the top of the detection box body > the horizontal section of the metal shell > the inner wall horizontal section of the top of the detection box body; a chute horizontally penetrating through the left side surface is formed in the top of the detection box body; the flat metal shell is in sliding fit with the sliding groove. The flat metal shell is simple in shape and easy to process, the material cost is reduced, the use of screws is reduced, and the working hours can be reduced; the flat metal shell is connected with the GND electrode through the elastic pressing plate, so that the shielding effect of the flat metal shell can be stabilized. The dust sensor can reduce the manufacturing cost and the material cost, has a more stable electromagnetic shielding effect, and is more reliable in real-time monitoring of the dust concentration.

Description

Technical Field

[0001] The utility model relates to the technical field of dust sensors, in particular to a flat metal shell and a dust sensor thereof. Background Art

[0002] Dust sensors are generally used in workplaces where continuous monitoring of dust concentration is required. They use the principle of laser scattering to monitor the dust concentration in the air under natural wind conditions in real time. The basic working principle of dust sensors is that when parallel monochromatic light is emitted into the dust field, it is affected by the scattering and absorption of the dust around it, and the light intensity will be relatively attenuated. The relative concentration of the dust field is reflected by the relative attenuation of the parallel monochromatic light before and after it passes through the dust field. The intensity of the parallel monochromatic light is related to the size of the electrical signal generated by its photoelectric conversion. Therefore, a general dust sensor includes a light-emitting element, a light-receiving element, and a control circuit; the light-emitting element is to emit parallel monochromatic light to the dust field; the light-receiving element is to photoelectrically convert the monochromatic light passing through the dust field to form an electrical signal that can be directly measured; the control circuit is to supply power to the light-emitting element and to measure the electrical signal converted by the light-receiving element; with the development of science and technology, the original existing dust sensors usually use circuit boards instead of related control circuits in order to achieve miniaturization and integration. In order to block external electromagnetic noise from amplifying the circuit board signal, the dust sensor housing is made of metal material; for example, the patented dust sensor with authorization announcement number CN104949905B is provided with a shielding cover 12 that is completely installed using screws; however, the shielding cover 12 has a complex shape, is difficult to process, and has a high material cost. Utility Model Content

[0003] The purpose of the utility model is to solve the above problems and provide a flat metal shell and a dust sensor thereof.

[0004] The technical solution of the utility model is: a flat metal shell body is in the shape of a plate, has a simple shape, is easy to process, and reduces material costs; a downward elastic pressing plate is provided at the bottom of the flat metal shell; the elastic pressing plate has a simple structure, is easy to manufacture, and can reduce costs.

[0005] Preferably, a rectangular notch B is provided at one corner of the flat metal shell.

[0006] Furthermore, a rectangular notch corresponding to the elastic pressing plate is provided at the left end of the flat metal shell; the notch makes the elastic pressing plate become the operating end of the flat metal shell.

[0007] Preferably, the elastic pressure plate includes a connected horizontal section and an inclined section; the inclined section connects the horizontal section and the flat metal shell; and the inclined section applies downward pressure to the horizontal section using its own elasticity.

[0008] Further, the horizontal section is provided with a through connection hole, which can cooperate with a screw for installation and limit.

[0009] Further, the elastic pressing plate is integrally formed with the flat metal shell, which is more conducive to production and manufacturing.

[0010] A dust sensor including the above flat metal shell further includes a detection box body and a circuit board; the horizontal cross-section of the outer wall at the top of the detection box body > the horizontal cross-section of the metal shell > the horizontal cross-section of the inner wall at the top of the detection box body, realizing the shielding of the inside of the detection box body by the flat metal shell, achieving electromagnetic shielding, and at the same time ensuring the sliding relationship between the flat metal shell and the detection box body; a chute horizontally penetrating the left side is provided at the top of the detection box body; the flat metal shell is slidably matched with the chute; the flat metal shell is pushed into the detection box body along the chute, realizing the sliding relationship between the flat metal shell and the detection box body.

[0011] The circuit board is installed in the detection box body below the flat metal shell; a GND electrode is provided on the top surface of the circuit board; the bottom of the elastic pressing plate abuts against the GND electrode, which can stabilize the potential of the flat metal shell and improve the shielding effect of the flat metal shell. The horizontal section ensures stable contact with the GND electrode.

[0012] A connector is also provided on the top surface of the circuit board; a notch C corresponding to the connector is provided at the top of the side wall of the detection box body; the connector is exposed outside the metal shell through notch B and notch C, facilitating the connection of the power supply line and the signal transmission line.

[0013] A rectangular notch A connected to the chute is provided on the left side wall of the detection box body below the chute; the notch A corresponds to the elastic pressing plate; the notch A and notch D are opposite; the notch A provides an entrance for the elastic pressing plate to enter the detection box body.

[0014] Further, the top surface of the horizontal section does not exceed the bottom end of the notch A; the horizontal section entering the detection box body will be blocked by the left wall of the detection box body below the notch A and be stuck inside the detection box body.

[0015] Preferably, a card slot corresponding to the flat metal shell is provided on the inner wall of the right side of the detection box body; the right end of the flat metal shell is inserted into the card slot; the card slot supports the right end of the flat metal shell to ensure the sealing degree and shielding performance of the flat metal shell.

[0016] Preferably, the dust sensor further includes a support plate, a light-emitting element, a light-receiving element, and a reflective element; the support plate is arranged below the circuit board to support the circuit board, ensure the height of the circuit board in the box body, and make the GND electrode contact with the elastic pressing plate; a dust inlet hole is provided at the center of the flat metal shell to allow dust to enter; a dust outlet hole coaxial with the dust inlet hole is provided at the bottom of the box body to discharge dust; a dust chamber is provided between the dust inlet hole and the dust outlet hole for the dust sensor to detect; through holes A and B coaxial with the dust inlet hole are respectively provided on the circuit board and the support plate to facilitate the passage of dust; the light-emitting element and the light-receiving element are installed at the bottom of the circuit board to avoid direct contact with dust; the reflective element is arranged in the space below the support plate in the box body; the reflective element is correspondingly arranged below the light-emitting element and the light-receiving element; the support plate is provided with a light-emitting through hole corresponding to the light-emitting element and a light-receiving through hole corresponding to the light-receiving element; the reflective element arranged below the light-emitting element reflects the monochromatic light emitted by the light-emitting element into the dust chamber; the reflective element arranged below the light-receiving element emits the monochromatic light from the dust chamber to the light-receiving element; the parallel monochromatic light emitted by the light-emitting element irradiates the reflective element below it through the light-emitting through hole and is reflected by the reflective element into the dust chamber; in this dust chamber, the parallel monochromatic light encountering dust has its light intensity attenuated; the attenuated parallel monochromatic light is reflected by the reflective element of the light-receiving element to the light-receiving element and converted into an electrical signal.

[0017] Preferably, a dust tube is coaxially and fixedly connected above the through hole B; the dust tube passes through the through hole A to facilitate the entry of dust into the dust chamber.

[0018] Preferably, the light-emitting element, the light-receiving element, and the dust inlet hole are arranged in a triangle.

[0019] The beneficial effects of the present invention are as follows: The flat metal shell of the present invention has the following advantages:

[0020] (1) The flat metal shell of the present invention not only has a simple shape, is easy to process, reduces material costs, but also reduces the use of screws, which can reduce man-hours; the flat metal shell is connected to the GND electrode through an elastic pressing plate, which can stabilize the shielding effect of the flat metal shell;

[0021] (2) The card slot of the present invention supports the right end of the flat metal shell to ensure the tightness and shielding performance of the flat metal shell.

[0022] The dust sensor including the flat metal shell can reduce manufacturing costs and material costs, and has a more stable electromagnetic shielding effect, making the real-time monitoring of dust concentration more reliable. Description of the Drawings

[0023] Figure 1 is a perspective view of the flat metal shell of the present invention in the first embodiment;

[0024] Figure 2 It is a perspective view of the flat metal shell of the present utility model in the second embodiment;

[0025] Figure 3 It is a perspective view of the flat metal shell of the present utility model in the third embodiment;

[0026] Figure 4 It is a perspective view of the dust sensor in the fourth embodiment;

[0027] Figure 5 It is Figure 4 A partial side view sectional view of

[0028] Figure 6 It is Figure 4 A sectional perspective view of

[0029] Figure 7 It is a perspective view of the dust sensor in the fifth embodiment;

[0030] Figure 8 It is Figure 7 A partial side view sectional view of

[0031] Figure 9 It is the dust sensor in the seventh embodiment;

[0032] In the figure: 11. Flat metal shell, 111. Elastic pressing plate, 1111. Horizontal section, 1112. Inclined section, 112. Notch B, 113. Notch D, 114. Dust inlet hole, 12. Box body, 121. Notch A, 122. Notch C, 123. Card slot, 124. Dust outlet hole, 125. Dust cavity, 126. Slide groove, 2. Circuit board, 21. GND electrode, 22. Connector, 23. Through hole A, 3. Support plate, 31. Dust pipe, 32. Light emitting through hole, 33. Light receiving through hole, 4. Light emitting element, 5. Light receiving element, 6. Reflective element. Detailed implementation manners

[0033] Embodiment 1: Refer to Figure 1 , the main body of a flat metal shell 11 is plate-shaped, with a simple shape, easy to process, and reduces material costs; a downward elastic pressing plate 111 is provided at the bottom of the flat metal shell 11; the elastic pressing plate 111 has a simple structure and is easy to manufacture, which can reduce costs.

[0034] Compared with the prior art, the flat metal shell 11 of the present utility model not only has a simple shape, is easy to process, and reduces material costs, but also reduces the use of screws, which can reduce man-hours; the elastic pressing plate 111 has a simple structure and is easy to manufacture, which can reduce costs.

[0035] A rectangular notch B 112 is provided at one corner of the flat metal shell 11.

[0036] The elastic pressing plate 111 includes a connected horizontal section 1111 and an inclined section 1112; the inclined section 1112 connects the horizontal section 1111 and the flat metal shell 11; the inclined section 1112 applies a downward pressure to the horizontal section 1111 by its own elasticity.

[0037] A rectangular notch D 113 corresponding to the elastic pressing plate 111 is provided at the left end of the flat metal shell 11; the notch D 113 makes the elastic pressing piece become the operating end of the flat metal shell 11.

[0038] The elastic pressing plate 111 and the flat metal shell 11 are integrally formed, which is more conducive to production and manufacturing.

[0039] The working principle of this embodiment: The main body of the flat metal shell 11 is flat, with a simple shape, easy to process, and reduces material costs; the flat metal shell 11 is pushed into the inside of the box body 12 along the chute 126 to cover the circuit board 2, which can play a certain shielding effect; the flat metal shell 11 is connected to the GND electrode 21 through the elastic pressing plate 111, which can stabilize the shielding effect of the flat metal shell 11.

[0040] Embodiment Two: Refer to Figure 2 , Embodiment Two is basically the same as Embodiment One, and the same parts will not be described again. The difference is that: the horizontal section 1111 is provided with a through connection hole, which can be matched with a screw for installation and limit.

[0041] Embodiment Three: Refer to Figure 3 , Embodiment Three is basically the same as Embodiment One, and the same parts will not be described again. The difference is that: the horizontal section 1111 in this embodiment is higher than the horizontal section 1111 in Embodiment One.

[0042] Embodiment Four: Refer to Figures 4 - 6 , A dust sensor including the flat metal shell 11 described in Embodiment One further includes a detection box body 12; the horizontal cross-section of the outer wall at the top of the detection box body 12 > the horizontal cross-section of the metal shell > the horizontal cross-section of the inner wall at the top of the detection box body 12, realizing the shielding of the inside of the detection box body 12 by the flat metal shell 11, achieving electromagnetic shielding, and at the same time ensuring the sliding relationship between the flat metal shell 11 and the detection box body 12; a chute 126 horizontally penetrating the left side is provided at the top of the detection box body 12; the flat metal shell 11 is slidably matched with the chute 126; the flat metal shell 11 is pushed into the inside of the detection box body 12 along the chute 126, realizing the sliding relationship between the flat metal shell 11 and the detection box body 12.

[0043] The dust sensor further includes a circuit board 2; the circuit board 2 is installed in a detection box body 12 below a flat metal shell 11; a GND electrode 21 is provided on the top surface of the circuit board 2; the bottom of an elastic pressing plate 111 abuts against the GND electrode 21, which can stabilize the potential of the flat metal shell 11 and improve the shielding effect of the flat metal shell 11. The horizontal section 1111 ensures stable contact with the GND electrode 21.

[0044] A connector 22 is also provided on the top surface of the circuit board 2; a notch C 122 corresponding to the connector 22 is provided at the top of the side wall of the detection box body 12; the connector 22 is exposed outside the metal shell through a notch B 112 and the notch C 122, facilitating the connection of a power supply line and a signal transmission line.

[0045] A rectangular notch A 121 connected to the chute 126 is provided on the left side wall of the detection box body 12 below the chute 126; the notch A 121 corresponds to the elastic pressing plate 111; the notch A 121 and a notch D 113 are opposite; the notch A 121 provides an entrance for the elastic pressing plate 111 to enter the interior of the detection box body 12.

[0046] The top surface of the horizontal section 1111 does not exceed the bottom end of the notch A 121; the horizontal section 1111 entering the interior of the detection box body 12 will be blocked by the left wall of the detection box body 12 below the notch A 121 and stuck inside the detection box body 12; in this embodiment, the top surface of the horizontal section 1111 is aligned with the bottom end of the notch A 121.

[0047] A card slot 123 corresponding to the flat metal shell 11 is provided on the right inner wall of the detection box body 12; the right end of the flat metal shell 11 is inserted into the card slot 123; the card slot 123 supports the right end of the flat metal shell 11 to ensure the sealing degree and shielding performance of the flat metal shell 11.

[0048] The dust sensor further includes a support plate 3, a light-emitting element 4, a light-receiving element 5, and a reflective element 6; the support plate 3 is arranged below the circuit board 2 to support the circuit board 2 and ensure the height of the circuit board 2 in the box body 12, so that the GND electrode 21 is in contact with the elastic pressing plate 111; a dust inlet hole 114 is provided in the center of the flat metal shell 11 to allow dust to enter; a dust outlet hole 124 coaxial with the dust inlet hole 114 is provided at the bottom of the box body 12 to discharge dust; a dust chamber 125 is formed between the dust inlet hole 114 and the dust outlet hole 124 for the dust sensor to detect; through holes Jia 23 and through holes Yi coaxial with the dust inlet hole 114 are provided on the circuit board 2 and the support plate 3 respectively to facilitate the passage of dust; the light-emitting element 4 and the light-receiving element 5 are installed at the bottom of the circuit board 2 to avoid direct contact with dust; the reflective element 6 is arranged in the space below the support plate 3 in the box body 12; the reflective element 6 is correspondingly arranged below the light-emitting element 4 and the light-receiving element 5; the support plate 3 is provided with a light-emitting through hole 32 corresponding to the light-emitting element 4 and a light-receiving through hole 33 corresponding to the light-receiving element 5; the reflective element 6 arranged below the light-emitting element 4 reflects the monochromatic light emitted by the light-emitting element 4 into the dust chamber 125; the reflective element 6 arranged below the light-receiving element 5 emits the monochromatic light from the dust chamber 125 to the light-receiving element 5; the parallel monochromatic light emitted by the light-emitting element 4 irradiates the reflective element 6 below through the light-emitting through hole 32 and is reflected by the reflective element 6 into the dust chamber 125; in the dust chamber 125, the parallel monochromatic light encountering dust has its light intensity attenuated; the attenuated parallel monochromatic light is reflected by the reflective element 6 of the light-receiving element 5 to the light-receiving element 5 and converted into an electrical signal.

[0049] A dust pipe 31 is coaxially and fixedly connected above the through hole Yi; the dust pipe 31 passes through the through hole Jia 23 to facilitate the entry of dust into the dust chamber 125.

[0050] The light-emitting element 4, the light-receiving element 5, and the dust inlet hole 114 are arranged in a triangular shape.

[0051] Example Five: Refer to Figures 7 - 8 , Example Five is basically the same as Example Four, and the same parts will not be described again. The difference is that the flat metal shell 11 included in this dust sensor is the flat metal shell 11 in Example Two.

[0052] Example Six: Refer to Figure 9 , Example Six is basically the same as Example Four, and the same parts will not be described again. The difference is that the flat metal shell 11 included in this dust sensor is the flat metal shell 11 in Example Three.

Claims

1. A flat metal shell, characterized in that, The main body is flat; an elastic pressing plate is provided at the bottom of the flat metal shell and extends downward; the elastic pressing plate includes a connected horizontal section and an inclined section; the inclined section connects the horizontal section and the main body of the flat metal shell.

2. The flat metal shell according to claim 1, wherein: A rectangular notch B is provided at one corner of the flat metal shell.

3. The flat metal shell according to claim 2, characterized in that: A rectangular notch D corresponding to the elastic pressing plate is provided at the left end of the flat metal shell.

4. The flat metal shell according to claim 1, wherein: The horizontal section is provided with a through connection hole.

5. A dust sensor comprising the flat metal shell according to any one of claims 1-4, characterized in that: It further includes a detection box body and a circuit board; the horizontal cross-section of the outer wall at the top of the detection box body > the horizontal cross-section of the metal shell > the horizontal cross-section of the inner wall at the top of the detection box body; a chute horizontally penetrating the left side is provided at the top of the detection box body; the flat metal shell is in sliding fit with the chute; The circuit board is installed in the detection box body below the flat metal shell; a GND electrode is provided on the top surface of the circuit board; the bottom of the elastic pressing plate abuts against the GND electrode; a connector corresponding to the notch B is further provided on the top surface of the circuit board; a rectangular notch C corresponding to the connector is provided at the top of the side wall of the detection box body; A rectangular notch A connected to the chute is provided on the left side wall of the detection box body below the chute; the notch A corresponds to the elastic pressing plate; the notch A and the notch D are opposite to each other.

6. The dust sensor with a flat metal shell according to claim 5, characterized in that: A card slot corresponding to the flat metal shell is provided on the inner wall of the right side of the detection box body; the right end of the flat metal shell is inserted into the card slot.

7. The dust sensor with a flat metal shell according to claim 5, characterized in that: It further includes a support plate, a light-emitting element, a light-receiving element, and a reflecting element; the support plate is arranged below the circuit board to support the circuit board; a dust inlet hole is provided at the center of the flat metal shell; a dust outlet hole coaxial with the dust inlet hole is provided at the bottom of the detection box body; a dust chamber is formed between the dust inlet hole and the dust outlet hole; through holes A and B coaxial with the dust inlet hole are respectively provided on the circuit board and the support plate; the light-emitting element and the light-receiving element are installed at the bottom of the circuit board; the reflecting element is arranged in the space below the support plate in the detection box body; the reflecting element is correspondingly arranged below the light-emitting element and the light-receiving element; the support plate is provided with a light-emitting through hole corresponding to the light-emitting element and a light-receiving through hole corresponding to the light-receiving element; The reflecting element arranged below the light-emitting element reflects the monochromatic light emitted by the light-emitting element into the dust chamber; The reflecting element arranged below the light-receiving element emits the monochromatic light from the dust chamber to the light-receiving element.

8. The dust sensor with a flat metal shell according to claim 5, characterized in that: A dust pipe is coaxially and fixedly connected above the through hole B; the dust pipe passes through the through hole A.

9. The dust sensor with a flat metal shell according to claim 5, wherein: The light-emitting element, the light-receiving element, and the dust inlet hole are arranged in a triangular pattern.

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