一种气室加热结构及气体传感器

Abstract

本实用新型涉及气体传感器技术领域，公开了一种气室加热结构及气体传感器；气体传感器包括气室、电路板和气室加热结构；气室加热结构包括：至少一加热器，用于与电路板电连接；以及，导热膜，其一侧面适配的贴覆于气室的外壁上，其另一侧面的至少部分与加热器连接或抵接或紧邻，以使得加热器可通过导热膜加热气室。本实用新型通过在气室外部设置导热膜，并基于导热膜和加热器之间的相对位置关系，使得加热器可对导热膜进行加热，由于导热膜的导热效果较好，加热器的能量能够较好地传递至整个导热膜，导热膜也能够将能量更均匀地传导至气室中，使气室能够有温升，以解决气室内冷凝 / 结霜的问题。

Claims

1. A gas chamber heating structure for use in a gas sensor comprising a light source (5), the gas sensor further comprising a gas chamber (1) and a circuit board (2), characterized in that, The air chamber heating structure includes: At least one heater (3) is used for electrical connection with the circuit board (2); and, A thermally conductive film (4) is adapted to be attached to the outer wall of the air chamber (1) on one side, and at least part of the other side is connected to, abutted against or adjacent to the heater (3) so that the heater (3) can heat the air chamber (1) through the thermally conductive film (4).

2. The plenum heating structure of claim 1, wherein, It also includes thermally conductive adhesive; The thermally conductive film (4) is adjacent to the heater (3); the thermally conductive adhesive is at least partially applied in the gap between the thermally conductive film (4) and the heater (3).

3. The plenum heating structure of claim 1, wherein, One end of the heater (3) is used to be fixedly connected to the circuit board (2). The end of the heater (3) fixed to the circuit board (2) is close to the thermal conductive film (4), and the end of the heater (3) away from the circuit board (2) abuts against the thermal conductive film (4).

4. The plenum heating structure of claim 3, wherein, In the direction away from the circuit board (2), the distance between the heater (3) and the heat-conducting film (4) on the side wall of the heater (3) near the heat-conducting film (4) gradually decreases, so that the end of the heater (3) away from the circuit board (2) abuts against the heat-conducting film (4).

5. The plenum heating structure of claim 3, wherein, The heater (3) has an arc or folded side wall near the heat-conducting film (4) so ​​that the end of the heater (3) away from the circuit board (2) abuts against the heat-conducting film (4).

6. A plenum heating structure as claimed in any one of claims 1 to 5, wherein, The heater (3) includes a heating element (31), a housing (32), and pins (33); the housing (32) covers the heating element (31) and exposes at least a portion of the surface of the heating element (31) facing the thermal conductive film (4); the pins (33) extend from the heating element (31), pass through the housing (32), and are used for fixed electrical connection with the circuit board (2).

7. The plenum heating structure of claim 6, wherein, The heating element (31) protrudes from the cover shell (32) at one end away from the circuit board (2) and extends in a direction away from the cover shell (32) and close to the thermal conductive film (4) to abut against the thermal conductive film (4).

8. A gas sensor, characterized by include: Circuit board (2); A detection component, disposed on the circuit board (2), includes a light source (5), an air chamber (1), and a signal receiver (6). The detection component is configured such that: light emitted by the light source (5) enters the air chamber (1), and the signal receiver (6) receives a signal from inside the air chamber (1); and, The air chamber heating structure as described in any one of claims 1-7.

9. A gas sensor as claimed in claim 8, characterised in that, At least a portion of the sidewall of the air chamber (1) includes an optical surface, and one side of the thermally conductive film (4) is adapted to be attached to the outer wall of the optical surface of the air chamber (1).

10. The gas sensor of claim 8, wherein The circuit board (2) is provided with a limiting frame (7), which is sleeved on the outside of the air chamber (1) and the heater (3) and is fixedly connected to the air chamber (1).

11. The gas sensor of claim 10, wherein At least one first positioning structure is provided between the limiting frame (7) and the air chamber (1). The first positioning structure includes a first positioning hole (81) and a first positioning protrusion (82) that are adapted to be engaged. One of the first positioning hole (81) and the first positioning protrusion (82) is provided on the outer wall of the optical surface of the air chamber (1), and the other is provided on the limiting frame (7). The first positioning protrusion (82) includes a protrusion body fixedly connected to the air chamber (1). The protrusion body is provided with three planes, which are respectively the upper surface of the protrusion body opposite to the circuit board (2) and the front and rear surfaces along the length direction of the air chamber (1). The limiting frame (7) has a main body and a plate body fixedly connected to the main body and extending in a direction away from the circuit board (2). The first positioning hole (81) is opened on the plate body. The first positioning hole (81) is configured such that when the first positioning protrusion (82) is inserted into the first positioning hole (81), the three planes on the first positioning protrusion (82) abut against the inner wall of the first positioning hole (81). The first positioning protrusion (82) has a first inclined surface below the protrusion body, and a second inclined surface is provided on the side of the upper end of the plate with the first positioning hole (81) facing the air chamber. It is configured such that the first inclined surface and the second inclined surface abut against each other before the first positioning protrusion (82) is engaged with the first positioning hole (81). At least one third positioning structure is provided between the air chamber (1) and the circuit board (2). The third positioning structure includes a first connecting part (86) provided on the outer wall of the air chamber and a second connecting part provided on the circuit board (2). The first connecting part (86) and the second connecting part are fixedly connected to each other by screws.

12. The gas sensor of claim 8, wherein The gas sensor also includes: The housing (9), the circuit board (2), the detection component and the air chamber heating structure are disposed inside the housing (9); as well as, Mounting bracket (10) is used for fixed connection with external electrical appliances and is detachably slidably mounted on the housing (9); The mounting bracket (10) is used to install at the external electrical sensor interface. After the mounting bracket (10) is installed with the housing (9), the sensor interface is exposed. It is configured such that when the housing (9) is connected to the mounting bracket (10), the plug portion of the gas sensor is inserted into the sensor interface of the external electrical appliance. Two sliding mounting structures are provided between the housing (9) and the mounting bracket (10). The two sliding mounting structures are located on opposite sides of the housing (9). Each sliding mounting structure includes a slide rail (11) and a slider (12) that are adapted to slide together. One of the slide rail (11) and the slider (12) is located on the outer wall of the housing (9), and the other is located on the mounting bracket (10), so that the housing (9) and the mounting bracket (10) are slidably connected. The plug portion of the sensor is located on the housing. (9) At the front end during sliding installation; two fifth positioning structures are also provided between the housing (9) and the mounting bracket (10). The two fifth positioning structures are located on opposite sides of the housing (9). Each fifth positioning structure includes a positioning groove (13) and a positioning protrusion (14) that are adapted to engage. One of the positioning groove (13) and the positioning protrusion (14) is located on the outer wall of the housing (9), and the other is located on the mounting bracket (10), so that the housing (9) and the mounting bracket (10) engage after sliding. The gas sensor further includes a relay (15), which is disposed inside the housing (9) and is used to electrically connect with the signal receiver (6) and the external electrical appliance to control the working state of the external electrical appliance according to the detection signal of the signal receiver (6).

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