Air quality sensor

Abstract

The utility model discloses an air quality sensor which comprises a shell and a printed circuit board (PCB) arranged in the shell. The shell comprises a back plate and an outer shell, the outer shell is clamped on the back plate, a pressing plate assembly is clamped on the back plate, and the pressing plate assembly is connected with the PCB; the shell presses the pressing plate assembly through the inner supporting column so that the pressing plate assembly can press and fix the PCB on the back plate. The PCB fixing device is novel in structure, the PCB is easy to disassemble and assemble, follow-up maintenance is convenient, a screw fixing mode is replaced, and labor saving and rapidness are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and in particular relates to an air quality sensor. Background Technology

[0002] Air quality sensors, also known as comprehensive air environment monitoring instruments, are commonly used to monitor values ​​such as temperature, humidity, air pressure, light intensity, PM2.5, PM10, TVOC, as well as the concentration of gases such as oxygen, carbon dioxide, carbon monoxide, and formaldehyde in the air.

[0003] In existing air quality sensors, the housing and circuit board are fixed to the back plate with screws. When repairing the circuit board, the screws need to be unscrewed step by step, the housing and circuit board need to be removed one by one, and the screws need to be tightened step by step after the repair is completed. The operation is cumbersome, laborious and inconvenient. Summary of the Invention

[0004] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art, and to provide an air quality sensor with a novel structure, simple PCB circuit board assembly and disassembly, convenient subsequent maintenance, and a replacement for screw fixing method, which is labor-saving and quick.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An air quality sensor includes a housing and a PCB circuit board, with the PCB circuit board disposed within the housing. The housing comprises a back plate and an outer shell, the outer shell being snapped onto the back plate. A pressure plate assembly is snapped onto the back plate, and the pressure plate assembly is connected to the PCB circuit board. The outer shell presses down on the pressure plate assembly via an internal support, thereby securing the PCB circuit board to the back plate. This air quality sensor features a novel structure, simple PCB circuit board assembly and disassembly, convenient subsequent maintenance, and replaces screw fixing, saving effort and time.

[0007] Furthermore, the pressure plate assembly includes a connecting ring and a pressure block. The pressure block is located on the connecting ring, and the PCB circuit board has a fixing through hole. The pressure block has a fixing protrusion corresponding to the fixing through hole. During installation, the fixing protrusion is embedded into the fixing through hole, so that the pressure block connects to the PCB circuit board. After the outer shell is installed, the connecting ring is pressed down by the inner support, and the connecting ring presses down on the PCB circuit board by the pressure block, tightening step by step to restrict the free movement of the PCB circuit board. This provides reliable fixation, replacing the screw fixing method, making disassembly and assembly easier and more convenient, and facilitating subsequent maintenance.

[0008] Furthermore, the back plate is provided with a positioning base, and the positioning base has a slot. The pressure plate assembly has a positioning block corresponding to the slot. The positioning block is inserted into the slot, so that the pressure plate assembly is positioned on the back plate. Positioning is convenient and installation efficiency is high. The positioning block is in close contact with the inner wall of the slot, with high friction, so the positioning block is not easy to fall out of the slot, resulting in high installation stability.

[0009] Furthermore, the back panel is provided with a latch, and the side of the outer shell is provided with a limiting through hole corresponding to the latch. During installation, the latch is inserted into the limiting through hole to limit the outer shell to the back panel, ensuring a reliable connection and replacing the screw fixing method, making disassembly and assembly convenient; pressing the latch inward to make it move away from the limiting through hole allows the outer shell to be removed.

[0010] Furthermore, the back panel has symmetrically distributed positioning protrusions that correspond to the openings of the outer shell, making it easier to position the outer shell on the back panel and reducing the difficulty of positioning. After the outer shell is installed, the positioning protrusions are in close contact with the inner wall of the outer shell, resulting in high friction and making the outer shell less prone to loosening, thus making the installation more reliable.

[0011] Furthermore, the back panel has mounting holes; nails are driven into the mounting holes to fix the back panel to the wall, making installation convenient.

[0012] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0013] During installation, the fixing protrusion of the pressure block is embedded into the fixing through hole of the PCB circuit board, so that the PCB circuit board is limited on the pressure plate assembly. Then, the positioning block of the connecting ring is inserted into the slot of the positioning base, so that the pressure plate assembly is positioned on the back plate. Then, the latch of the back plate is inserted into the limiting through hole of the outer shell, so that the outer shell is limited on the back plate. The outer shell presses the connecting ring with the inner support, and the connecting ring presses the PCB circuit board on the back plate with the pressure block, pressing it step by step to restrict the free movement of the PCB circuit board and ensure reliable positioning.

[0014] This utility model has a novel structure, simple PCB board assembly and disassembly, convenient subsequent maintenance, and replaces screw fixing method, saving effort and time. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the structure of an air quality sensor according to the present invention;

[0017] Figure 2 This is a schematic diagram of the connection between the back plate and the pressure plate assembly in this utility model;

[0018] Figure 3 This is a schematic diagram of the PCB circuit board in this utility model;

[0019] Figure 4 This is a schematic diagram of the back plate structure in this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the pressure plate assembly of this utility model;

[0021] Figure 6This is a schematic diagram of the outer shell of this utility model.

[0022] In the diagram: 1-Housing; 2-PCB circuit board; 3-Back plate; 4-Outer shell; 5-Latch tongue; 6-Limiting through hole; 7-Positioning protrusion; 8-Mounting through hole; 9-Pressure plate assembly; 10-Connecting ring; 11-Pressure block; 12-Fixing through hole; 13-Fixing protrusion; 14-Inner support column; 15-Positioning base; 16-Slot; 17-Positioning block; 18-Flow hole. Detailed Implementation

[0023] like Figures 1 to 6 As shown, this utility model discloses an air quality sensor, comprising: a housing 1 and a PCB circuit board 2. The PCB circuit board 2 is equipped with an IC chip, a carbon dioxide sensor module, a PM2.5 sensor module, a temperature sensor module, a humidity sensor module, a VOC sensor module, and a power supply module. The IC chip is connected to the carbon dioxide sensor module, the PM2.5 sensor module, the temperature sensor module, the humidity sensor module, and the VOC sensor module for signal transmission. The carbon dioxide sensor module, the PM2.5 sensor module, the temperature sensor module, the humidity sensor module, and the VOC sensor module are all existing technologies and can detect various gas indicators in the current ambient air in real time, which will not be described in detail here.

[0024] The housing 1 is equipped with an RS485 communication interface, which is electrically connected to the PCB circuit board 2.

[0025] The housing 1 includes a back plate 3 and an outer shell 4. The back plate 3 has symmetrically distributed latches 5. The outer shell 4 has a flow hole 18 and a limiting through hole 6 on its side, and the limiting through hole 6 corresponds to the latches 5.

[0026] During installation, insert the latch 5 into the limiting through hole 6 to limit the outer shell 4 onto the back plate 3, ensuring a reliable connection and replacing the screw fixing method, making disassembly and assembly convenient; press the latch 5 inward to make it leave the limiting through hole 6, and the outer shell 4 can be removed.

[0027] The back plate 3 has symmetrically distributed positioning protrusions 7, which correspond to the openings of the outer shell 4, making it easy to position the outer shell 4 on the back plate 3 and reducing the difficulty of positioning. After the outer shell 4 is installed, the positioning protrusions 7 are in close contact with the inner wall of the outer shell 4, resulting in high friction and making the outer shell 4 less prone to loosening, thus making the installation more reliable.

[0028] The back panel 3 has mounting through holes 8. Nails are driven into the mounting through holes 8 to fix the back panel 3 to the wall, making installation convenient.

[0029] A pressure plate assembly 9 is snapped onto the back plate 3. The pressure plate assembly 9 includes a connecting ring 10 and pressure blocks 11. The pressure blocks 11 are symmetrically distributed on the connecting ring 10. The PCB circuit board 2 is provided with fixing through holes 12. The pressure blocks 11 are provided with fixing protrusions 13 corresponding to the fixing through holes 12. An inner support column 14 is provided inside the outer casing 4. The inner support column 14 corresponds to the connecting ring 10.

[0030] During installation, the fixing protrusion 13 is embedded into the fixing through hole 12, so that the pressure block 11 connects to the PCB circuit board 2. After the outer shell 4 is installed, the inner support 14 presses down on the connecting ring 10. The connecting ring 10 then presses the PCB circuit board 2 onto the back plate 3 through the pressure block 11, pressing it down step by step to restrict the free movement of the PCB circuit board 2. The positioning is reliable and replaces the screw fixing method. It is easy to disassemble and assemble, and facilitates subsequent maintenance.

[0031] The back plate 3 has symmetrically distributed positioning bases 15, and the positioning bases 15 are provided with slots 16. The connecting ring 10 is provided with positioning blocks 17 corresponding to the slots 16.

[0032] During installation, the positioning block 17 is inserted into the slot 16 to position the pressure plate assembly 9 on the back plate 3. Positioning is convenient and installation is efficient. The positioning block 17 is in close contact with the inner wall of the slot 16, resulting in high friction. The positioning block 17 is not easy to detach from the slot 16, thus ensuring high installation stability.

[0033] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. An air quality sensor, comprising: a housing and a PCB circuit board arranged in the housing; characterized in that: the housing comprises a back plate and a shell, the shell is clamped on the back plate, a pressing plate assembly is clamped on the back plate, and the pressing plate assembly is connected to the PCB circuit board; the shell presses the pressing plate assembly through an inner support to make the pressing plate assembly press and fix the PCB circuit board on the back plate.

2. An air quality sensor according to claim 1, characterised in that: the pressing plate assembly comprises a connecting ring and a pressing block arranged on the connecting ring, the PCB circuit board is provided with a fixed through hole, and the pressing block is provided with a fixed protrusion corresponding to the fixed through hole.

3. An air quality sensor according to claim 1, wherein: the back plate is provided with a positioning base, the positioning base is provided with a clamping groove, and the pressing plate assembly is provided with a positioning block corresponding to the clamping groove.

4. An air quality sensor according to claim 1, wherein: the back plate is provided with a clamping tongue, and the side surface of the shell is provided with a limiting through hole corresponding to the clamping tongue.

5. An air quality sensor according to claim 1, wherein: the back plate is provided with symmetrical positioning protrusions corresponding to the opening of the shell.

6. An air quality sensor according to claim 1, wherein: the back plate is provided with a mounting through hole.

Images