Micro differential pressure sensor verification and calibration device

Abstract

The utility model discloses a micro differential pressure sensor verification and calibration device which comprises a micro air pump, a main pipeline is arranged at the end of the micro air pump, the end, away from the micro air pump, of the main pipeline is connected with two auxiliary pipelines, one auxiliary pipeline is provided with a flow adjusting valve for controlling gas flow, the end of the other auxiliary pipeline is connected with a U-shaped pipe, and the U-shaped pipe is connected with a gas inlet pipe. The end, away from the auxiliary pipeline, of the U-shaped pipe is connected with the auxiliary pipeline, the end of the auxiliary pipeline is connected with two ventilation pipes, the end of one ventilation pipe is connected with a connector, the end of the other ventilation pipe is connected with an intelligent standard differential pressure transmitter, and the end of the connector is used for being connected with a product to be tested. The micro-differential pressure generating device is simple in structure, different water column heights are generated in the U-shaped pipe by controlling the air outlet flow of the micro air cylinder, so that differential pressure is generated, the to-be-measured differential pressure sensor can be verified and calibrated through the computer, and compared with a traditional micro-differential pressure generating device, the micro-differential pressure generating device is low in cost, low in machining difficulty, convenient and fast.

Description

Technical Field

[0001] The utility model relates to the technical field of verification and calibration of micro-differential pressure sensors, in particular to a verification and calibration device for micro-differential pressure sensors. Background Art

[0002] In special vehicles, it is often necessary to establish a positive pressure difference of 300pa in the cabin to ensure that poisonous gases outside the cabin do not enter the cabin. Therefore, these vehicles are often equipped with micro-differential pressure sensors to collect the overpressure value in the cabin. However, the micro-differential pressure sensor will be affected by factors such as usage time or environmental changes, resulting in certain errors in the collected results, so the micro-differential pressure sensor needs to be calibrated.

[0003] However, during the calibration process of the micro-differential pressure sensor, it is necessary to provide a relatively stable pressure differential. The traditional mechanical pressure differential generating device generally adopts the form of a piston cylinder, which has high processing accuracy and process requirements, high cost, and requires manual recording of the test results, which is time-consuming and labor-intensive. Therefore, a micro-differential pressure sensor verification and calibration device is proposed. Utility Model Content

[0004] The utility model aims to provide a micro-pressure difference sensor verification and calibration device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a micro-pressure differential sensor verification and calibration device, comprising a micro air pump, a main pipeline is provided at the end of the micro air pump, and the end of the main pipeline away from the micro air pump is connected to two auxiliary pipelines, one of which is equipped with a flow regulating valve for controlling the gas flow, and the end of the other auxiliary pipeline is connected to a U-shaped tube, and the end of the U-shaped tube away from the auxiliary pipeline is connected to the secondary pipeline, the end of the secondary pipeline is connected to two ventilation pipes, the end of one ventilation pipe is connected to a joint, and the end of the other ventilation pipe is connected to an intelligent standard differential pressure transmitter, the end of the joint is used to connect to a product to be tested, and the intelligent standard differential pressure transmitter and the product to be tested are both connected to a computer.

[0006] As a further solution of the utility model: the micro air pump, U-shaped tube and intelligent standard differential pressure transmitter are all installed inside the box, and the flow regulating valve and the joint are all installed on the side wall of the box.

[0007] As a further solution of the utility model: the end of the main pipeline is connected to the two auxiliary pipelines through a three-way joint A, and the end of the secondary pipeline is connected to the two ventilation pipes through a three-way joint B.

[0008] As a further solution of the utility model: the main pipeline, the auxiliary pipeline, the secondary pipeline and the ventilation pipe are all made of rubber material.

[0009] As a further solution of the utility model: liquid is arranged inside the cavity of the U-shaped tube.

[0010] As a further solution of the utility model: the surface of the U-shaped tube is provided with scales, which are configured to observe the liquid in the cavity of the U-shaped tube.

[0011] As a further solution of the utility model: a switch button for controlling whether the micro air pump is running is installed on the side wall of the box.

[0012] As a further solution of the utility model: the micro air pump and the U-shaped tube are both fixed to the inner wall of the box cavity by bolts.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model has a novel structure, and generates different water column heights in the U-tube by controlling the air outlet flow rate of the micro-cylinder, thereby realizing the generation of pressure difference, and the pressure difference sensor to be measured can be verified and calibrated by a computer. Compared with traditional forms of micro-pressure difference generating devices, the utility model has lower cost, lower processing difficulty, and is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the verification and calibration device of the utility model;

[0015] Figure 2 This is a schematic diagram of the principle of the verification and calibration device of the utility model;

[0016] In the figure: 1. Box; 2. Micro air pump; 3. Main pipeline; 4. Auxiliary pipeline; 5. Three-way connector A; 6. Flow regulating valve; 7. U-shaped pipe; 8. Secondary pipeline; 9. Ventilation pipe; 10. Connector; 11. Three-way connector B; 12. Intelligent standard differential pressure transmitter; 13. Computer. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions 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. Based on the embodiments in 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.

[0018] See also Figure 1-2In an embodiment of the utility model, a micro differential pressure sensor verification and calibration device includes a micro air pump 2, a main pipeline 3 is provided at the end of the micro air pump 2, and the end of the main pipeline 3 away from the micro air pump 2 is connected to two auxiliary pipelines 4, one of which is equipped with a flow regulating valve 6 for controlling the gas flow, and the end of the other auxiliary pipeline 4 is connected to a U-shaped tube 7, a liquid is provided inside the cavity of the U-shaped tube 7, a scale is provided on the surface of the U-shaped tube 7, and is configured to observe the liquid in the cavity of the U-shaped tube 7, and the end of the U-shaped tube 7 away from the auxiliary pipeline 4 is connected to a secondary pipeline 8, and the end of the secondary pipeline 8 is connected to two ventilation pipes 9, and the end of one of the ventilation pipes 9 is connected to a joint 10, the end of another vent pipe 9 is connected to the intelligent standard differential pressure transmitter 12, the main pipeline 3, the auxiliary pipeline 4, the secondary pipeline 8 and the vent pipe 9 are all made of rubber material, the end of the joint 10 is used to connect the product to be tested, and the intelligent standard differential pressure transmitter 12 and the product to be tested are both connected to the computer 13 (the data of the intelligent standard differential pressure transmitter 12 and the data of the product to be tested are uploaded to the computer 13 through I²C. If the difference between the value of the intelligent standard differential pressure transmitter 12 and the value of the pressure differential sensor to be tested is less than or equal to 10, it means that there is no error in the pressure differential sensor to be tested. If the difference between the values ​​is greater than 10, it means that there is an error in the pressure differential sensor to be tested).

[0019] Specifically, first connect the pressure differential sensor to be measured to the port of the connector 10, then press the switch button on the box 1 to make the micro air pump 2 run and discharge gas, and the gas enters the two auxiliary pipelines 4 respectively through the main pipeline 3, and a flow regulating valve 6 is installed at the end of one of the auxiliary pipelines 4 to achieve the gas flow rate of the gas entering the other auxiliary pipeline 4. Due to the change of the gas flow rate, the height of the water column inside the U-shaped tube 7 changes, thereby achieving different pressure differences. The other end of the U-shaped tube 7 is divided into two paths through two ventilation pipes 9, one path is connected to the intelligent standard differential pressure transmitter 12, and the other path is connected to the pressure differential sensor to be measured connected to the port of the connector 10, and real-time data is collected through the computer 13, and the pressure differential sensor to be measured is verified and calibrated by the computer 13.

[0020] See also Figure 1 In one embodiment, in order to better carry and protect the verification and calibration device, in this embodiment, preferably, the micro air pump 2, the U-shaped tube 7 and the intelligent standard differential pressure transmitter 12 are all installed inside the box body 1, and the flow regulating valve 6 and the connector 10 are both installed on the side wall of the box body 1. Furthermore, the box body 1 is also provided with an upper cover for closing the top of the box body 1, and the side wall of the box body 1 is also provided with a buckle for fixing the upper cover and the box body 1 and a handle for the staff to carry the verification and calibration device, wherein the flow regulating valve 6 and the connector 10 are arranged on the side wall of the box body 1 for the convenience of the staff to operate.

[0021] See also Figure 1In one embodiment, in order to connect the main pipeline 3 with the two sub-pipelines 4, in this embodiment, preferably, the end of the main pipeline 3 is connected to the two sub-pipelines 4 through a three-way joint A5. Further, the three-way joint A5 has three ports, one of which is connected to the main pipeline 3 to serve as an air intake, and the other two ports are respectively connected to the two sub-pipelines 4 to serve as an air outlet. The end of the sub-pipeline 8 is connected to the two ventilation pipes 9 through a three-way joint B11. Further, the three-way joint B11 has three ports, one of which is connected to the sub-pipeline 8 to serve as an air intake, and the other two ports are respectively connected to the two ventilation pipes 9 to serve as an air outlet.

[0022] See also Figure 1 In one embodiment, in this embodiment, preferably, the micro air pump 2 and the U-shaped tube 7 are fixed to the inner wall of the cavity of the box body 1 by bolts, so as to facilitate the maintenance or replacement of the micro air pump 2 and the U-shaped tube 7 after they are damaged in subsequent use.

[0023] The working principle and use process of the utility model are as follows: the micro air pump 2 generates gas, and the gas is discharged in two ways, one way is connected to the flow regulating valve 6, and the other way is connected to one end of the U-shaped tube 7. The gas flow of the branch is controlled by adjusting the flow regulating valve 6, thereby controlling the gas flow of the other way. Due to the change in flow, the height of the water column inside the U-shaped tube 7 changes, thereby achieving different pressure differences. The other end of the U-shaped tube 7 is divided into two ways, one way is connected to the intelligent standard differential pressure transmitter 12, and the other way is connected to the pressure differential sensor to be measured. The data of the intelligent standard differential pressure transmitter 12 and the pressure differential sensor to be measured can be collected in real time through the computer 13, and the pressure differential sensor to be measured can be verified and calibrated by the computer 13.

[0024] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0025] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A micro differential pressure sensor calibration device, comprising a micro air pump (2), characterized in that: The end of the micro air pump (2) is provided with a main pipeline (3), and the end of the main pipeline (3) away from the micro air pump (2) is connected to two auxiliary pipelines (4), one of which is equipped with a flow regulating valve (6) for controlling the gas flow, the end of the other auxiliary pipeline (4) is connected to a U-shaped tube (7), and the end of the U-shaped tube (7) away from the auxiliary pipeline (4) is connected to a secondary pipeline (8), the end of the secondary pipeline (8) is connected to two ventilation pipes (9), the end of one ventilation pipe (9) is connected to a joint (10), and the end of the other ventilation pipe (9) is connected to an intelligent standard differential pressure transmitter (12), the end of the joint (10) is used to connect to a product to be tested, and the intelligent standard differential pressure transmitter (12) and the product to be tested are both connected to a computer (13).

2. The micro differential pressure sensor verification and calibration device according to claim 1, characterized in that: The micro air pump (2), the U-shaped tube (7) and the intelligent standard differential pressure transmitter (12) are all installed inside the box (1), and the flow regulating valve (6) and the connector (10) are both installed on the side wall of the box (1).

3. The micro differential pressure sensor verification and calibration device according to claim 1, characterized in that: The end of the main pipeline (3) is connected to the two auxiliary pipelines (4) via a three-way joint A (5), and the end of the secondary pipeline (8) is connected to the two ventilation pipes (9) via a three-way joint B (11).

4. The micro differential pressure sensor verification and calibration device according to claim 1, characterized in that: The main pipeline (3), the auxiliary pipeline (4), the secondary pipeline (8) and the ventilation pipe (9) are all made of rubber material.

5. The micro differential pressure sensor verification and calibration device according to claim 1, characterized in that: Liquid is arranged inside the cavity of the U-shaped tube (7).

6. The micro differential pressure sensor verification and calibration device according to claim 5, characterized in that: The surface of the U-shaped tube (7) is provided with scales and is configured to observe the liquid in the cavity of the U-shaped tube (7).

7. The micro differential pressure sensor verification and calibration device according to claim 2, characterized in that: A switch button for controlling whether the micro air pump (2) is in operation is installed on the side wall of the box (1).

8. The micro differential pressure sensor verification and calibration device according to claim 2, characterized in that: The micro air pump (2) and the U-shaped tube (7) are both fixed to the inner wall of the cavity of the box body (1) by means of bolts.

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