PM2.5 sensor calibration device
By designing the PM2.5 sensor calibration device, using the measuring cylinder and pressurized sheet to change the density and volume of the gas in the detection chamber, the problems of detection consistency and error control of PM2.5 sensors in the prior art are solved, and higher accuracy and yield are achieved.
Patent Information
- Application Number
- CN202323110340.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-17
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2033-11-17
AI Technical Summary
The existing PM2.5 sensor detection methods cannot guarantee the consistency and error level of mass production equipment, resulting in low accuracy and low yield.
A PM2.5 sensor calibration device is designed. By combining a measuring cylinder, ventilation head, pressurized sheet and standard sensor/PM2.5 sensor, the density and volume of gas in the detection chamber are changed, and the detection difference between standard sensor and PM2.5 sensor is calibrated.
Accurate calibration of PM2.5 sensors is achieved, consistency and error control of production equipment are ensured, and yield rate is improved.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of PM2.5 sensors, in particular to a PM2.5 sensor calibration device. Background Art
[0002] The main pollutant in haze is PM2.5 particles. In order to facilitate the detection of PM2.5 concentration in the air, a PM2.5 sensor is needed. During the manufacturing process of PM2.5 sensors, due to production deviations, the produced PM2.5 sensors need to be tested to ensure that the detection error of the PM2.5 sensors is within the specified range. When the existing PM2.5 sensors are tested, the air to be tested needs to be passed into the testing equipment, and the ventilated air is tested using the PM2.5 sensor. The existing detection method mainly passes two airs with different PM2.5 concentrations and determines the detection range of the PM2.5 sensor by changing the ratio between the two. The existing detection equipment cannot guarantee the consistency and error level of mass-produced PM2.5 sensors, and cannot perform targeted calibration of PM2.5 sensors. This leads to problems such as low accuracy and low yield of PM2.5 sensors. Utility Model Content
[0003] The purpose of the utility model is to provide a PM2.5 sensor calibration method and device to solve the problems raised in the above background technology.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a PM2.5 sensor calibration device, comprising a measuring cylinder, a vent head is fixedly connected to the side end of the measuring cylinder, a pressure plate is slidably connected to the middle of the measuring cylinder, a detection chamber is formed between the measuring cylinder and the pressure plate, a standard sensor and a PM. sensor are respectively arranged on both sides of the vent head, the standard sensor is fixedly connected to the inner wall of the measuring cylinder, a mounting block is plugged into the side end of the measuring cylinder, the PM. sensor is fixedly connected to the mounting block, a vent is arranged in the middle of the pressure plate, a sealing ball is arranged in the middle of the vent, a limiting fixing mechanism is arranged in a ring at the side end of the sealing ball, the limiting fixing mechanism is composed of a deformation plate, a connecting plate, a guide plate, a limiting ball, a blocking block and an extrusion column, and the side end of the sealing ball is provided with An extrusion plate, a connecting piece is slidably connected in the middle of the extrusion plate, both ends of the connecting piece pass through the extrusion plate, the connecting piece is a columnar structure with a large diameter at one end and a small diameter at the other end, one end of the connecting piece is fixedly connected to a sealing ball, an extrusion spring is provided between the other end of the connecting piece and the extrusion plate, a clamping fixing mechanism is fixedly connected to the inner wall of the measuring cylinder, the clamping fixing mechanism consists of a rotating ring, a clamping plate, an auxiliary plate and a reset spring, a fixing plate is fixedly connected to the inner wall of the measuring cylinder, an electric push rod is fixedly connected to the side end of the fixing plate, a connecting frame is fixedly connected to the power output end of the electric push rod, the connecting frame is a U-shaped structure, the top end of the connecting piece is fixedly connected to the extrusion plate, a mounting ring is provided on the inner wall of the measuring cylinder, and a plurality of U-shaped plates are fixedly connected to the side end of the pressure plate.
[0005] Preferably, the deformation sheet is a V-shaped structure, the deformation sheet is an elastic iron sheet, one end of the deformation sheet is fixedly connected to the pressure sheet, and the other end of the deformation sheet is fixedly connected to the connecting plate.
[0006] Preferably, the guide plate is an arc-shaped structure, the top end of the connecting plate is fixedly connected to the guide plate, and the limiting ball is fixedly connected to the top end of the guide plate.
[0007] Preferably, a fixing groove is provided at the side end of the sealing ball, a limiting groove is provided on the inner wall of the fixing groove, and both the fixing groove and the limiting groove are arc-shaped structures. When the sealing ball and the vent are tightly connected, the limiting ball is clamped in the limiting groove.
[0008] Preferably, a plurality of control plates are slidably connected in the middle of the extrusion plate, the control plate is an L-shaped structure, both ends of the control plate pass through the extrusion plate, the top of the extrusion column is fixedly connected to the control plate, the extrusion column is located at the side end of the connecting plate, a blocking block is fixedly connected in the middle of the connecting plate, and both sides of the blocking block are arc-shaped structures.
[0009] Preferably, a plurality of blocking plates are fixedly connected to the side ends of the pressure plate, the blocking plates correspond to the guide plates one by one, the blocking plates are L-shaped structures, and the side ends of the blocking plates are provided with card slots.
[0010] Preferably, the rotating ring is rotatably connected to the inner wall of the mounting ring, the auxiliary plate is fixedly connected to the outer wall of the rotating ring, the return spring is fixedly connected between the auxiliary plate and the rotating ring, the clamping plate is fixedly connected to the inner wall of the rotating ring, and the power output end of the electric push rod is fixedly connected to a plurality of control parts, the control part is an L-shaped structure, and the side end of the control part is a sloped structure.
[0011] A PM sensor calibration method comprises the following steps:
[0012] Step 1: Input gas through the vent head. At this time, the vent is in a closed state. At this time, the standard sensor and PM sensor detect the gas in the detection chamber;
[0013] Step 2: The pressurizing sheet is pushed by the electric push rod to squeeze the gas in the detection chamber and move the pressurizing sheet to different positions, thereby increasing the gas concentration in the detection chamber. The standard sensor and PM sensor detect the gas in the detection chamber.
[0014] Step 3: The electric push rod drives the pressure plate to move, thereby opening the vent to discharge the air in the detection cavity;
[0015] Step 4: Repeat steps 1 and 2 multiple times to measure the average value.
[0016] Compared with the prior art, the beneficial effect of the utility model is as follows: by compressing the air in the detection chamber, the PM2.5 density in the ventilation air is changed. When the volume in the detection chamber is changed to different sizes, the air in the detection chamber is detected by a standard sensor and a PM2.5 sensor to determine the detection range of the PM2.5 sensor, and the PM2.5 sensor is calibrated by the numerical difference between the standard sensor and the PM2.5 sensor, so that the produced PM2.5 sensors are more accurate, and mass-produced PM2.5 sensors can be detected and calibrated to ensure the yield of the produced PM2.5 sensors. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 Schematic diagram of the internal structure of the detection tube.
[0018] Figure 2 It is a schematic diagram of the connection of the card fixing mechanism.
[0019] In the figure: 1 measuring cylinder, 2 ventilation head, 3 standard sensor, 4 mounting block, 5 PM2.5 sensor, 6 pressure plate, 7 detection chamber, 8 ventilation port, 9 sealing ball, 10 fixing plate, 11 electric push rod, 12 control part, 13 mounting ring, 14 U-shaped plate, 21 clamping fixing mechanism, 211 rotating ring, 212 clamping plate, 213 auxiliary plate, 214 reset spring. DETAILED DESCRIPTION
[0020] In order to deepen the understanding and recognition of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described and introduced in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, and are not intended to limit the embodiments in any form. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] See also Figure 1-2The utility model provides a technical solution: a PM2.5 sensor calibration device, comprising a measuring cylinder 1, a ventilation head 2 is fixedly connected to the side end of the measuring cylinder 1, a pressure plate 6 is slidably connected to the middle of the measuring cylinder 1, a detection chamber 7 is provided between the measuring cylinder 1 and the pressure plate 6, a standard sensor 3 and a PM2.5 sensor 5 are respectively provided on both sides of the ventilation head 2, the standard sensor 3 is fixedly connected to the inner wall of the measuring cylinder 1, a mounting block 4 is plugged into the side end of the measuring cylinder 1, the PM2.5 sensor 5 is fixedly connected to the mounting block 4, a vent 8 is provided in the middle of the pressure plate 6, a sealing ball 9 is provided in the middle of the vent 8, a limited position fixing mechanism is arranged in a ring at the side end of the sealing ball 9, and the limited position fixing mechanism is composed of a deformation plate, a connecting plate, a guide plate, a limiting ball, a blocking block and an extrusion column, an extrusion plate is provided at the side end of the sealing ball 9, a connecting piece is slidably connected to the middle of the extrusion plate, both ends of the connecting piece pass through the extrusion plate, the connecting piece is a columnar structure with a large diameter at one end and a small diameter at the other end, and one end of the connecting piece is a cylindrical structure with a large diameter at one end and a small diameter at the other end. The end is fixedly connected to the sealing ball 9, and an extrusion spring is provided between the other end of the connecting piece and the extrusion plate. A clamping fixing mechanism 21 is fixedly connected to the inner wall of the measuring cylinder 1, and the clamping fixing mechanism 21 is composed of a rotating ring 211, a clamping plate 212, an auxiliary plate 213 and a reset spring 214. A fixing plate 10 is fixedly connected to the inner wall of the measuring cylinder 1, and an electric push rod 11 is fixedly connected to the side end of the fixing plate 10. The power output end of the electric push rod 11 is fixedly connected to a connecting frame, and the connecting frame is a U-shaped structure. The top of the connecting piece is fixedly connected to the extrusion plate, and a mounting ring 13 is provided on the inner wall of the measuring cylinder 1. A plurality of U-shaped plates 14 are fixedly connected to the side end of the pressure sheet 6. By squeezing the pressure sheet, the volume of the detection cavity is changed, the density of the air introduced is changed, the air is detected by the standard sensor and the PM2.5 sensor, the detection range of the PM2.5 sensor is determined, and the PM2.5 sensor is calibrated to ensure the yield rate of the PM2.5 sensor.
[0022] The deformation piece is a V-shaped structure, the deformation piece is an elastic iron sheet, one end of the deformation piece is fixedly connected to the pressure piece 6, the other end of the deformation piece is fixedly connected to the connecting plate, the guide plate is an arc-shaped structure, the top of the connecting plate is fixedly connected to the guide plate, the limiting ball is fixedly connected to the top of the guide plate, the side end of the sealing ball 9 is provided with a fixing groove, the inner wall of the fixing groove is provided with a limiting groove, the fixing groove and the limiting groove are both arc-shaped structures, when the sealing ball 9 is tightly connected to the vent 8, the limiting ball is clamped in the limiting groove, a plurality of control panels are slidably connected in the middle of the extrusion plate, the control panel is an L-shaped structure, both ends of the control panel pass through the extrusion plate, and the top of the extrusion column It is fixedly connected to the control board, the extrusion column is located at the side end of the connecting plate, and a blocking block is fixedly connected to the middle of the connecting plate. The two sides of the blocking block are arc-shaped structures. When the electric push rod 11 drives the extrusion plate to squeeze the sealing ball 9, the sealing ball 9 squeezes the guide plate, so that the deformation sheet is deformed and accumulates force until the sealing ball 9 reaches the fixed groove. At this time, under the action of the deformation sheet, the limit ball is clamped in the limit groove to squeeze the sealing ball 9, thereby sealing the vent 8. At this time, the electric push rod 11 continues to work, which can drive the pressurizing sheet 6 to move and squeeze the air in the detection cavity 7, thereby increasing the air density.
[0023] A plurality of blocking plates are fixedly connected to the side ends of the pressure plate 6. The blocking plates correspond to the guide plates one by one. The blocking plates are L-shaped structures. A card slot is provided at the side ends of the blocking plates. When the pressure plate 6 moves to the initial position, the electric push rod 11 drives the control plate and the extrusion column to continue to move, and the extrusion column drives the connecting plate to move, thereby deforming the deformation plate and disengaging the limiting ball from the limiting groove, thereby opening the vent 8. The blocking plate blocks the guide plate to ensure the pulling force when the pressure plate 6 is pulled downward.
[0024] The rotating ring 211 is rotatably connected to the inner wall of the mounting ring 13, the auxiliary plate 213 is fixedly connected to the outer wall of the rotating ring 211, the reset spring 214 is fixedly connected between the auxiliary plate 213 and the rotating ring 211, the clamping plate 212 is fixedly connected to the inner wall of the rotating ring 211, and the power output end of the electric push rod 11 is fixedly connected with a plurality of control parts 12, the control part 12 is an L-shaped structure, and the side end of the control part 12 is a slope structure. The clamping plate 212 is clamped in the middle of the U-shaped plate 14 to limit and fix the pressure plate 6, which is convenient for the sealing ball 9 to seal the vent 8. When the sealing ball 9 completes the sealing of the vent 8, the control part 12 can squeeze the clamping plate 212, so that the clamping plate 212 is separated from the U-shaped plate 14. When the power output end of the electric push rod continues to move, the pressure plate 6 can move to squeeze the air in the detection cavity 7 to increase the density.
[0025] A PM2.5 sensor calibration method comprises the following steps:
[0026] Step 1: input gas through the vent head 2, at this time the vent 8 is in a closed state, and the standard sensor 3 and the PM2.5 sensor 5 detect the gas in the detection chamber 7;
[0027] Step 2: The pressurizing sheet 6 is pushed by the electric push rod 11 to squeeze the gas in the detection chamber 7 and move the pressurizing sheet 6 to a different position, thereby increasing the gas concentration in the detection chamber 7. The standard sensor 3 and the PM2.5 sensor 5 detect the gas in the detection chamber 7;
[0028] Step 3: The electric push rod 11 drives the pressure plate 6 to move, thereby opening the vent 8 to discharge the air in the detection cavity 7;
[0029] Step 4: Repeat steps 1 and 2 multiple times to measure the average value.
[0030] Although the embodiments of the utility model have been shown and described, it should be emphasized that the above description is only an introduction and description of the use of the embodiments of the utility model, and does not limit the utility model in any form. For those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the attached claims and their equivalents.
Claims
1. A PM2.5 sensor calibration device, comprising a measuring tube (1), characterized in that: The side end of the measuring tube (1) is fixedly connected with a vent head (2), the middle of the measuring tube (1) is slidably connected with a pressure plate (6), a detection chamber (7) is provided between the measuring tube (1) and the pressure plate (6), a standard sensor (3) and a PM2.5 sensor (5) are respectively provided on both sides of the vent head (2), the standard sensor (3) and the inner wall of the measuring tube (1) are fixedly connected, a mounting block (4) is plugged into the side end of the measuring tube (1), the PM2.5 sensor (5) and the mounting block (4) are fixedly connected, a vent (8) is provided in the middle of the pressure plate (6), a sealing ball (9) is provided in the middle of the vent (8), a limiting fixing mechanism is arranged in an annular manner at the side end of the sealing ball (9), the limiting fixing mechanism is composed of a deformation plate, a connecting plate, a guide plate, a limiting ball, a blocking block and an extrusion column, an extrusion plate is provided at the side end of the sealing ball (9), and a connecting piece is slidably connected in the middle of the extrusion plate. , both ends of the connecting piece pass through the extrusion plate, the connecting piece is a columnar structure with a large diameter at one end and a small diameter at the other end, one end of the connecting piece is fixedly connected to the sealing ball (9), and an extrusion spring is provided between the other end of the connecting piece and the extrusion plate, a clamping fixing mechanism (21) is fixedly connected to the inner wall of the measuring cylinder (1), and the clamping fixing mechanism (21) is composed of a rotating ring (211), a clamping plate (212), an auxiliary plate (213) and a reset spring (214), a fixing plate (10) is fixedly connected to the inner wall of the measuring cylinder (1), a side end of the fixing plate (10) is fixedly connected to an electric push rod (11), and a power output end of the electric push rod (11) is fixedly connected to a connecting frame, and the connecting frame is a U-shaped structure, the top end of the connecting piece is fixedly connected to the extrusion plate, a mounting ring (13) is provided on the inner wall of the measuring cylinder (1), and a plurality of U-shaped plates (14) are fixedly connected to the side end of the pressure plate (6).
2. A PM2.5 sensor calibration device according to claim 1, characterized in that: The deformation piece is a V-shaped structure, the deformation piece is an elastic iron sheet, one end of the deformation piece is fixedly connected to the pressure piece (6), and the other end of the deformation piece is fixedly connected to the connecting plate.
3. A PM2.5 sensor calibration device according to claim 1, characterized in that: The guide plate is an arc-shaped structure, the top end of the connecting plate is fixedly connected to the guide plate, and the limiting ball is fixedly connected to the top end of the guide plate.
4. A PM2.5 sensor calibration device according to claim 1, characterized in that: A fixing groove is provided at the side end of the sealing ball (9), and a limiting groove is provided on the inner wall of the fixing groove. Both the fixing groove and the limiting groove are arc-shaped structures. When the sealing ball (9) and the vent (8) are tightly connected, the limiting ball is clamped in the limiting groove.
5. The PM2.5 sensor calibration device according to claim 1, characterized in that: A plurality of control plates are slidably connected in the middle of the extrusion plate, the control plate is an L-shaped structure, both ends of the control plate pass through the extrusion plate, the top of the extrusion column is fixedly connected to the control plate, the extrusion column is located at the side end of the connecting plate, a blocking block is fixedly connected in the middle of the connecting plate, and both sides of the blocking block are arc-shaped structures.
6. A PM2.5 sensor calibration device according to claim 1, characterized in that: A plurality of blocking plates are fixedly connected to the side ends of the pressure plate (6), the blocking plates correspond to the guide plates one by one, the blocking plates are L-shaped structures, and the side ends of the blocking plates are provided with card slots.
7. A PM2.5 sensor calibration device according to claim 1, characterized in that: The rotating ring (211) is rotatably connected to the inner wall of the mounting ring (13); the auxiliary plate (213) is fixedly connected to the outer wall of the rotating ring (211); the return spring (214) is fixedly connected between the auxiliary plate (213) and the rotating ring (211); the clamping plate (212) is fixedly connected to the inner wall of the rotating ring (211); and a plurality of control members (12) are fixedly connected to the power output end of the electric push rod (11); the control members (12) are of L-shaped structure, and the side ends of the control members (12) are of inclined surface structure.