Particulate matter sensor with zero calibration gas filtering function

Abstract

The utility model relates to the technical field of particulate matter sensors, and provides a particulate matter sensor with a zero calibration gas filtering function, which comprises a shell, a detection cavity is arranged in the shell, two sides of the shell are respectively provided with a gas inlet pipe and a gas outlet pipe, the gas inlet pipe and the gas outlet pipe are communicated with the interior of the detection cavity, one side of the detection cavity is provided with a zero calibration pipe, and the zero calibration pipe is communicated with the interior of the detection cavity. A zero calibration pipe is arranged in the shell, the zero calibration pipe is communicated with the interior of the detection cavity, a containing groove is formed in one side of the shell, a cleaning air hole is formed in the containing groove, the zero calibration pipe is communicated with the cleaning air hole, a filtering cover plate is arranged on one side of the containing groove, a filtering membrane is further arranged in the containing groove, and the filtering membrane is arranged between the side wall of the containing groove and the filtering cover plate. And the filtering cover plate is detachably connected with the shell. According to the technical scheme, the time required for zero calibration of the sensor is shortened.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically to a particulate matter sensor with zero-calibration gas filtration function. Background Technology

[0002] Particulate matter sensors are crucial in dust monitoring instruments, enabling real-time detection of particulate matter concentrations in the air and aiding in the assessment of ambient air quality. Particulate matter sensors are commonly used to monitor particles of different sizes, such as PM2.5 and PM10, and are widely applied in industrial production, indoor air quality, and environmental protection. To ensure the accuracy of sensor measurements, zeroing is typically required.

[0003] Chinese Patent Publication No. CN205384204U discloses an online zeroing dust monitor, including a dust measuring device for detecting dust, and further comprising: a valve assembly having a first valve port for controlling the entry of measuring gas into the dust measuring device, a second valve port for controlling the entry of zeroing gas into the dust measuring device, a gas inlet for receiving zeroing gas output from an air pump, the connection between the second valve port, the dust measuring device, the air pump, and the gas inlet forming an air supply pipeline for zeroing the dust measuring device, and a third valve port for controlling gas discharge; and a filter device disposed on the air supply pipeline for filtering the zeroing gas.

[0004] The aforementioned technologies, when zeroing a dust measuring device (i.e., a particulate matter sensor), activate an air pump to provide zeroing gas and introduce it into the dust measuring device to expel internal particulate matter. Subsequently, the gas output from the dust measuring device is purified by a filter before returning to the air pump, thus achieving gas circulation and purification. However, the zeroing gas generated by the air pump may itself contain particulate matter. When this particulate-laden zeroing gas enters the particulate matter sensor, it can easily cause secondary pollution. Although the above technical solutions achieve circulation purification by setting a filter at the particulate matter sensor output and using an air pump, this circulation can only gradually filter the particulate matter in the zeroing gas, resulting in an excessively long overall zeroing cycle. Utility Model Content

[0005] This invention proposes a particulate matter sensor with a zero-calibration gas filtration function, which reduces the time required for sensor zero calibration.

[0006] The technical solution of this utility model is as follows: A particulate matter sensor with zero-calibration gas filtration function includes a housing, a detection chamber inside the housing, an inlet pipe and an outlet pipe on both sides of the housing respectively, and the inlet pipe and outlet pipe are connected to the inside of the detection chamber. A zero-calibration pipe is provided on one side of the detection chamber and is connected to the inside of the detection chamber. A receiving groove is provided on one side of the housing, and a cleaning air hole is provided in the receiving groove. The zero-calibration pipe is connected to the cleaning air hole. A filter cover is provided on one side of the receiving groove. A filter membrane is also provided inside the receiving groove and is disposed between the side wall of the receiving groove and the filter cover. The filter cover is detachably connected to the housing.

[0007] Furthermore, the receiving groove is provided with a filter membrane support rib on the side near the cleaning air hole, and the filter membrane support rib is fixedly connected to the inner wall of the receiving groove, with one side of the filter membrane support rib abutting against the filter membrane.

[0008] Furthermore, a slot is provided on one side of the receiving groove, and a block is provided on the side of the filter cover plate near the slot to engage with the slot. The filter cover plate is also provided with a sliding component to disengage the block from the slot.

[0009] Furthermore, the sliding assembly includes a sliding plate, a connecting block, and an elastic element. One side of the filter cover is provided with a receiving groove, and the slot is disposed inside the receiving groove and slidably connected to the inner wall of the receiving groove. One end of the elastic element abuts against the slot, and the other end of the elastic element abuts against the side of the receiving groove. A connecting groove is provided on the side of the receiving groove away from the receiving groove. The connecting block is fixedly connected to the slot and slidably connected to the inner wall of the connecting groove. The sliding plate is fixedly connected to one side of the connecting block and slidably connected to the surface of the filter cover.

[0010] Furthermore, guide grooves are provided on both sides of the receiving groove, and guide blocks are provided on both sides of the card block. Each guide block is fixedly connected to the card block, and the guide block is slidably connected to the inner wall of the guide groove.

[0011] Furthermore, the side of the receiving groove away from the card slot has an arc-shaped structure, and the side of the card block near the filter membrane is provided with a first inclined surface that is slidably connected to the side of the receiving groove with an arc-shaped structure.

[0012] Furthermore, the surface of the sliding plate is provided with anti-slip texture.

[0013] The working principle and beneficial effects of this utility model are as follows:

[0014] The zeroing tube, filter membrane, and filter cover of this invention ensure that the zeroing gas must pass through the filter membrane upon introduction, directly removing particulate matter from the gas and preventing secondary contamination of the particulate sensor at the source. The zeroing gas is filtered before entering the detection chamber, eliminating the need for recirculation and purification, significantly reducing the time required for sensor zeroing and improving practicality. Secondly, since the filter membrane and filter cover are both located on the particulate sensor housing, the overall structure is more compact, avoiding the need for an external filter and improving portability. Furthermore, the filter cover is detachably connected to the housing, facilitating easy replacement or cleaning of the filter membrane and reducing maintenance costs. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of the present utility model. Figure 2 ;

[0018] Figure 3 This is a partial exploded view of the structure of this utility model;

[0019] Figure 4 This is a partial cross-sectional view of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0021] Figure 6 This is a schematic diagram of the particle sensor, solenoid valve, and air pump in this embodiment.

[0022] In the diagram: 1. Housing; 101. Detection chamber; 102. Inlet pipe; 103. Outlet pipe; 104. Zeroing pipe; 105. Receiving groove; 106. Cleaning vent; 107. Filter cover plate; 108. Filter membrane; 109. Filter membrane support rib; 2. Slot; 201. Slot block; 2011. First inclined surface; 202. Sliding plate; 203. Connecting block; 204. Elastic element; 205. Receiving groove; 206. Connecting groove; 207. Guide groove; 208. Guide block; 3. Air pump; 4. Solenoid valve. Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0024] refer to Figure 1-6 A particulate matter sensor with zero-calibration gas filtration function includes a housing 1, an internal detection chamber 101, and a detection mechanism. The specific structure of the detection mechanism is well-known in the art and will not be described in detail here. An inlet pipe 102 and an outlet pipe 103 are respectively provided on both sides of the housing 1, and the inlet pipe 102 and the outlet pipe 103 are connected to the interior of the detection chamber 101. A zero-calibration tube 104 is provided on one side of the detection chamber 101, and the zero-calibration tube 104 is connected to the interior of the detection chamber 101. The zero-calibration tube 104 can be made of polytetrafluoroethylene or silicone rubber; this embodiment does not impose further limitations on this. Furthermore, the particulate matter sensor in this embodiment can be an optical particulate matter sensor.

[0025] Next, a receiving groove 105 is provided on one side of the housing 1. A cleaning air hole 106 is provided in the receiving groove 105. The zeroing tube 104 is connected to the cleaning air hole 106. A filter cover plate 107 is provided on one side of the receiving groove 105. A filter membrane 108 is also provided inside the receiving groove 105. The filter membrane 108 is disposed between the side wall of the receiving groove 105 and the filter cover plate 107. The filter cover plate 107 is detachably connected to the housing 1.

[0026] The zero-calibration tube 104, filter membrane 108, and filter cover 107 ensure that the zero-calibration gas must pass through the filter membrane 108 upon introduction, directly removing particulate matter from the gas and preventing secondary contamination of the particulate matter sensor at the source. The zero-calibration gas is filtered before entering the detection chamber 101, eliminating the need for recirculation purification, significantly shortening the filtration process time, facilitating operation, and improving practicality.

[0027] When using, refer to Figure 6 The air inlet pipe 102 and air outlet pipe 103 of the housing 1 are each connected to a detection tube, and a solenoid valve 4 is installed on the detection tube of the air inlet pipe 102. Simultaneously, the air pump 3 is connected to the detection tube of the air outlet pipe 103. When detecting the particulate matter content in the atmosphere, the solenoid valve 4 is opened and the air pump 3 is started. The air pump 3 creates a negative pressure in the detection chamber 101 inside the particulate matter sensor, causing air to enter the air inlet pipe 102 through the detection tube and flow into the detection chamber 101. The detection mechanism then detects the particulate matter content in the atmosphere.

[0028] After detection, the detection gas is discharged through the exhaust pipe 103. When zeroing is required, the solenoid valve 4 is closed and the air pump 3 is started. The air pump 3 creates a negative pressure inside the detection chamber 101. Due to the pressure difference, outside air enters the detection chamber 101 sequentially through the filter cover plate 107, filter membrane 108, cleaning vent 106, and zeroing tube 104, thereby gradually removing dust from the surface of the optical components inside the detection chamber 101 and improving the detection efficiency of the particulate matter sensor. Simultaneously, a miniature solenoid valve can be installed on the zeroing tube 104. When the particulate matter sensor detects the particulate matter content in the atmosphere, the miniature solenoid valve can be closed, ensuring that no gas enters the zeroing tube 104, thus avoiding its impact on the sensor's detection performance. When zeroing, the miniature solenoid valve is opened.

[0029] Furthermore, a filter membrane support rib 109 is provided on the side of the receiving tank 105 near the cleaning air hole 106, and the filter membrane support rib 109 is fixedly connected to the inner wall of the receiving tank 205. One side of the filter membrane support rib 109 abuts against the filter membrane 108. The support rib provides physical support for the filter membrane 108 to prevent it from deforming under gas pressure and ensure the stability of the filtration effect.

[0030] In this embodiment, a slot 2 is provided on one side of the receiving groove 105 (to improve the fixing effect of the filter cover 107, slots 2 can be provided on both sides). A locking block 201 is provided on the side of the filter cover 107 near the slot 2 to engage with the slot 2. A sliding component is also provided on the filter cover 107 to disengage the locking block 201 from the slot 2. Through the engaging cooperation of the slot 2 and the locking block 201, the connection between the filter cover 107 and the housing 1 is both stable and easy to operate. When the filter membrane 108 needs to be replaced, the filter cover 107 can be quickly removed and easily reinstalled after replacement, improving maintenance efficiency.

[0031] Specifically, the sliding assembly includes a sliding plate 202, a connecting block 203, and an elastic element 204. A receiving groove 205 is provided on one side of the filter cover 107. A slot 2 is disposed inside the receiving groove 205 and is slidably connected to the inner wall of the receiving groove 205. One end of the elastic element 204 abuts against the slot 201, and the other end of the elastic element 204 abuts against the side of the receiving groove 205. A connecting groove 206 is provided on the side of the receiving groove 205 away from the receiving groove 105. The connecting block 203 is fixedly connected to the slot 201 and slidably connected to the inner wall of the connecting groove 206. The sliding plate 202 is fixedly connected to one side of the connecting block 203 and slidably connected to the surface of the filter cover 107.

[0032] Through the cooperation of the sliding plate 202, connecting block 203, and elastic element 204, the operator can control the movement of the locking block 201 by pushing the sliding plate 202, thereby realizing the disassembly and installation of the filter cover 107. The operation is simple and convenient, requiring no additional tools. When disassembling the filter membrane 108, the operator slides the sliding plate 202, causing the sliding plate 202 to drive the locking block 201 towards the compression elastic element 204 via the connecting block 203, thereby causing the locking block 201 to retract into the receiving groove 205. When the locking block 201 disengages from the groove 2, the operator can remove the filter cover 107.

[0033] During installation, the operator slides the sliding plate 202, causing it to retract the locking block 201 into the receiving groove 205, and then places the filter cover 107 into the receiving groove 205. When the receiving groove 205 is aligned with the locking slot 2, the operator releases the sliding plate 202, the elastic element 204 returns to its original shape, and pushes the locking block 201 to engage with the locking slot 2, thereby fixing the filter cover 107.

[0034] To facilitate the sliding of the sliding plate 202 by the operator, anti-slip textures can be set on the surface of the sliding plate 202 to increase the friction between the operator's fingers and the sliding plate 202, making it less likely for the fingers to slip when pushing the sliding plate 202, and making the operation more precise and reliable.

[0035] Secondly, guide grooves 207 are provided on both sides of the receiving groove 205, and guide blocks 208 are provided on both sides of the locking block 201. Each guide block 208 is fixedly connected to the locking block 201, and the guide blocks 208 are slidably connected to the inner wall of the guide groove 207. The cooperation between the guide blocks 208 and the guide grooves 207 can limit the movement direction of the locking block 201, making the sliding of the locking block 201 in the receiving groove 205 more stable, preventing the locking block 201 from deviating during movement, ensuring the normal operation of the sliding assembly, and thus ensuring the smooth disassembly and installation of the filter cover 107. At the same time, it can also ensure that the elastic element 204 is subjected to uniform force, thereby extending the service life of the elastic element 204.

[0036] Furthermore, to facilitate the installation of the filter cover 107, the side of the receiving groove 105 away from the slot 2 is designed with an arc shape. The side of the locking block 201 near the filter membrane 108 has a first inclined surface 2011 that slides smoothly into the arc-shaped side of the receiving groove 105. The first inclined surface 2011 on the locking block 201 cooperates with this, allowing it to smoothly contact and slide against the edge of the receiving groove 105 during filter cover installation. This allows the locking block 201 to retract into the receiving groove 205 and move towards the compression elastic member 204. When the slot 2 is aligned with the receiving groove 205, the locking block 201 will engage with the slot 2 under the action of the elastic member 204, thus fixing the filter cover 107. This eliminates the need for operators to retract the locking block 201 into the receiving groove 205 beforehand, making installation easier and improving work efficiency.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A particulate matter sensor with zero calibration gas filtering function, comprising a shell (1), a detection cavity (101) is arranged inside the shell (1), an air inlet pipe (102) and an air outlet pipe (103) are arranged on both sides of the shell (1) respectively, and the air inlet pipe (102) and the air outlet pipe (103) are in communication with the inside of the detection cavity (101), characterized in that, One side of the detection cavity (101) is provided with a zero calibration tube (104), and the zero calibration tube (104) is in communication with the inside of the detection cavity (101); one side of the shell (1) is provided with a containing groove (105); the containing groove (105) is provided with a cleaning air hole (106); the zero calibration tube (104) is in communication with the cleaning air hole (106); one side of the containing groove (105) is provided with a filter cover plate (107); the inside of the containing groove (105) is further provided with a filter membrane (108), and the filter membrane (108) is arranged between the side wall of the containing groove (105) and the filter cover plate (107); and the filter cover plate (107) is detachably connected with the shell (1).

2. The particulate matter sensor with zero calibration gas filtering function according to claim 1, characterized in that: One side of the containing groove (105) close to the cleaning air hole (106) is further provided with a filter membrane support ridge (109), and the filter membrane support ridge (109) is fixedly connected with the inner wall of the containing groove (205); and one side of the filter membrane support ridge (109) is in abutment with the filter membrane (108).

3. The particulate matter sensor with zero offset gas filtering function according to claim 1, characterized in that: One side of the containing groove (105) is provided with a clamping groove (2); one side of the filter cover plate (107) close to the clamping groove (2) is provided with a clamping block (201) clamped with the clamping groove (2); and the filter cover plate (107) is further provided with a sliding assembly for making the clamping block (201) disengage from the clamping groove (2).

4. The particulate matter sensor with zero calibration gas filtering function according to claim 3, characterized in that: The sliding assembly comprises a sliding plate (202), a connecting block (203) and an elastic member (204); one side of the filter cover plate (107) is provided with a containing groove (205); the clamping groove (2) is arranged in the containing groove (205) and is in sliding connection with the inner wall of the containing groove (205); one end of the elastic member (204) is in abutment with the clamping block (201); the other end of the elastic member (204) is in abutment with the side surface of the containing groove (205); one side of the containing groove (205) away from the containing groove (105) is provided with a connecting groove (206); the connecting block (203) is fixedly connected with the clamping block (201) and is in sliding connection with the inner wall of the connecting groove (206); one side of the connecting block (203) is fixedly connected with the sliding plate (202), and the sliding plate (202) is in sliding connection with the surface of the filter cover plate (107).

5. The particulate matter sensor with zero offset gas filtering function according to claim 4, characterized in that: Both sides of the containing groove (205) are provided with guide grooves (207); both sides of the clamping block (201) are provided with guide blocks (208), and each guide block (208) is fixedly connected with the clamping block (201); and the guide blocks (208) are in sliding connection with the inner wall of the guide grooves (207).

6. The particulate matter sensor with zero offset gas filtering function according to claim 4, characterized in that: One side of the containing groove (105) away from the clamping groove (2) is in a circular arc shape structure; one side of the clamping block (201) close to the filter membrane (108) is provided with a first inclined surface (2011) in sliding connection with one side of the circular arc shape structure of the containing groove (105).

7. The particulate matter sensor with zero offset gas filtering function according to claim 4, characterized in that: The surface of the sliding plate (202) is provided with anti-skid lines.

Images