Durability test system of air pressure sensor

Abstract

The utility model relates to a durability test system of an air pressure sensor, which comprises an air source, a controller, a direction control valve, a vacuum generator, a vacuum pressure regulating valve, a vacuum electromagnetic valve, a positive pressure regulating valve, a positive pressure electromagnetic valve and a sealed mounting box, the air source is connected with the direction control valve. The direction control valve is connected with the vacuum generator, the vacuum generator is connected with the vacuum pressure regulating valve, the vacuum pressure regulating valve is connected with the vacuum electromagnetic valve, and the vacuum electromagnetic valve is connected with the sealing installation box. The direction control valve is connected with the positive pressure regulating valve, the positive pressure regulating valve is connected with the positive pressure electromagnetic valve, and the positive pressure electromagnetic valve is connected with the sealing installation box. According to the utility model, negative pressure is generated through the vacuum generator, and switches of the direction control valve, the vacuum electromagnetic valve and the positive pressure electromagnetic valve are controlled by the controller, so that the sealed mounting box is connected with positive pressure or negative pressure, and positive pressure or negative pressure durability test of the air pressure sensor is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensor detection, and in particular relates to a durability testing system for an air pressure sensor. Background Art

[0002] A barometric pressure sensor is a device used to measure gas pressure, and is usually used in areas such as air pressure control, barometric pressure transmission, and gas flow control. It measures the gas pressure from the operating environment and converts it into an electrical signal output for easy recording, analysis, and processing.

[0003] During the production process of air pressure sensors, it is necessary to perform durability testing on the air pressure sensors, generally the tests are positive pressure testing and negative pressure testing. For example, the patent with the publication number CN216116519U discloses a durability test device for air pressure sensors, which can only perform positive pressure testing but not negative pressure testing. For this reason, there is an urgent need for a durability testing system that can perform both positive and negative pressure testing. Summary of the invention

[0004] The utility model provides a durability testing system for an air pressure sensor to solve the technical problems mentioned in the prior art.

[0005] The technical solution of the utility model is as follows: a durability test system for an air pressure sensor, comprising: an air source, a controller, a directional control valve, a vacuum generator, a vacuum air pressure regulating valve, a vacuum solenoid valve, a positive pressure regulating valve, a positive pressure solenoid valve and a sealed installation box, wherein the control ends of the directional control valve, the vacuum solenoid valve and the positive pressure solenoid valve are all electrically connected to the controller, and the air source is connected to the input port of the directional control valve.

[0006] An output port of the directional control valve is connected to the air source inlet of the vacuum generator, the vacuum port of the vacuum generator is connected to an air source port of the vacuum air pressure relief valve, the other air source port of the vacuum air pressure relief valve is connected to an air source port of a vacuum solenoid valve, and the other air source port of the vacuum solenoid valve is connected to the air source input port of the sealed installation box.

[0007] Another output port of the directional control valve is connected to an air source port of the positive pressure regulating valve, another air source port of the positive pressure regulating valve is connected to an air source port of a positive pressure solenoid valve, and another air source port of the positive pressure solenoid valve is connected to an air source input port of the sealed installation box.

[0008] The sealed installation box is used to install the air pressure sensor to be tested, the vacuum generator is used to generate negative pressure by relying on the air flow of the air source, and the controller is used to control the positive and negative pressure in the sealed installation box through the directional control valve, the vacuum solenoid valve and the positive pressure solenoid valve.

[0009] Furthermore, the air source input port of the sealed installation box is connected to the positive pressure solenoid valve and the vacuum solenoid valve respectively through a three-way joint.

[0010] Furthermore, the controller, directional control valve, vacuum generator, vacuum solenoid valve, and positive pressure solenoid valve are all installed in an installation box, the vacuum pressure regulating valve and positive pressure regulating valve are installed on the side of the installation box, and a power supply is provided in the installation box, and the power supply is used to power the controller.

[0011] Furthermore, the power supply is connected to the controller via a protection relay.

[0012] Furthermore, the air source is generated by an air compressor, and the air compressor is connected to the directional control valve via an air source triplet.

[0013] Furthermore, the sealed mounting box includes: a base, a pressure ring, and a fixing bolt. The base is provided with a mounting hole, and the base is provided with multiple mounting holes. The air pressure detection port of the air pressure sensor to be tested extends into the mounting hole. A gas channel is provided inside the base, and a ventilation interface is provided on the base. The ventilation interface is connected with the gas channel, and the gas channel is connected with the mounting hole. The pressure ring is pressed on the main body of the air pressure sensor to be tested, and the pressure ring is fixed to the base by a fixing bolt.

[0014] Furthermore, the controller is a PLC controller.

[0015] Furthermore, the air pressure sensor to be tested is electrically connected to the controller via an analog-to-digital conversion module, and the controller is connected to a touch screen.

[0016] Beneficial effects of the utility model: The utility model generates negative pressure through a vacuum generator, and the controller controls the switches of the direction control valve, the vacuum solenoid valve and the positive pressure solenoid valve, so that the sealed installation box is connected to positive pressure or negative pressure, thereby realizing the positive pressure or negative pressure durability test of the air pressure sensor. The utility model fixes the air pressure sensor through a pressure ring, which greatly enhances the firmness of the sensor installation and can avoid the situation where the sensor is pushed out by the positive air pressure during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a connection structure diagram of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the installation box in the utility model.

[0019] Figure 3 It is a structural schematic diagram of the sealed installation box in the utility model.

[0020] Figure 4It is a schematic diagram of the cross-sectional structure of the sealing installation in the utility model. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. The described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0022] In an embodiment of the present utility model, Figure 1 This is a structural block diagram provided according to the specific structure of a durability test system for an air pressure sensor of the utility model. In order to distinguish between the circuit and the air circuit, Figure 1 The solid line in the figure is the gas path, and the dotted line is the circuit. Figure 1 As shown, the utility model specifically includes:

[0023] An air source 1, a controller 2, a directional control valve 3, a vacuum generator 4, a vacuum pressure regulating valve 5, a vacuum solenoid valve 6, a positive pressure regulating valve 7, a positive pressure solenoid valve 8 and a sealing installation box 9. The control ends of the directional control valve 3, the vacuum solenoid valve 6 and the positive pressure solenoid valve 8 are all electrically connected to the controller 2, and the air source 1 is connected to the input port of the directional control valve 3.

[0024] An output port of the directional control valve 3 is connected to the air source 1 inlet of the vacuum generator 4, the vacuum port of the vacuum generator 4 is connected to an air source 1 port of the vacuum air pressure control valve 5, the other air source 1 port of the vacuum air pressure control valve 5 is connected to an air source 1 port of the vacuum solenoid valve 6, and the other air source 1 port of the vacuum solenoid valve 6 is connected to the air source 1 input port of the sealed installation box 9.

[0025] The other output port of the directional control valve 3 is connected to an air source 1 port of the positive pressure regulating valve 7, the other air source 1 port of the positive pressure regulating valve 7 is connected to an air source 1 port of the positive pressure solenoid valve 8, and the other air source 1 port of the positive pressure solenoid valve 8 is connected to the air source 1 input port of the sealing installation box 9.

[0026] More specifically, the air source 1 input port of the sealed installation box 9 is connected to the positive pressure solenoid valve 8 and the vacuum solenoid valve 6 respectively through a three-way connector 13 .

[0027] The sealed installation box 9 is used to install the air pressure sensor to be tested, the vacuum generator 4 is used to generate negative pressure by relying on the air flow of the air source 1, and the controller 2 is used to control the positive and negative pressure in the sealed installation box 9 through the directional control valve 3, the vacuum solenoid valve 6 and the positive pressure solenoid valve 8.

[0028] The air source 1 is generated by an air compressor 11, and the air compressor 11 is connected to the directional control valve 3 through an air source triplex 12. The air source triplex 12 is a component composed of an air filter, a pressure reducing valve and an oil mist collector. The controller 2 can be a PLC controller.

[0029] Among them, the direction control valve 3 is an electromagnetic reversing valve, which is used to control whether the airflow of the air source 1 flows to the positive pressure channel or the negative pressure channel. In the negative pressure channel, the negative pressure is generated by the vacuum generator 4, and then transmitted to the vacuum air pressure regulating valve 5 through the pipeline. The vacuum air pressure regulating valve 5 is used to adjust the pressure of the negative pressure. After adjustment, it is passed into the sealed installation box 9 to form a negative pressure ring 92 environment in the box. The vacuum electromagnetic valve 6 is used to control the opening and closing of the negative pressure channel. In the positive pressure channel, the airflow of the air source 1 flows to the positive pressure regulating valve 7. The positive pressure regulating valve 7 is used to adjust the pressure of the positive pressure. After adjustment, it is passed into the sealed installation box 9 to form a positive pressure ring 92 environment in the box. The positive pressure electromagnetic valve 8 is used to control the opening and closing of the positive pressure channel. It should be noted that the positive pressure electromagnetic valve 8 and the vacuum electromagnetic valve 6 cannot be opened at the same time to avoid positive and negative pressures entering another channel and causing damage to components.

[0030] In one embodiment of the present invention, Figure 2 As shown, the controller 2, directional control valve 3, vacuum generator 4, vacuum solenoid valve 6, and positive pressure solenoid valve 8 are all installed in an installation box 10, wherein the installation box 10 is a waterproof box. The vacuum pressure regulating valve 5 and the positive pressure regulating valve 7 are installed on the side of the installation box 10, and the connecting pipes are led out of the box and then introduced. A power supply 14 is provided in the installation box 10, and the power supply 14 is used to power the controller 2. In order to ensure the safety of electricity use, the power supply 14 is connected to the controller 2 through a protection relay. The installation box 10 is provided with a power switch, and the power switch is used to control the start and stop of the controller 2. Two gas source 1 interfaces are provided on the side of the installation box 10, one of which is connected to the directional control valve 3, directly connected to the gas source 1, and is the inlet of the gas source 1. The other is connected to the three-way pipe and connected to the sealed box body, which is a test interface.

[0031] In one embodiment of the present invention, Figure 3 and Figure 4As shown, the sealed installation box 9 includes: a base 91, a pressure ring 92, and a fixing bolt 93. The base 91 is provided with a plurality of mounting holes 94. The air pressure detection port of the air pressure sensor to be tested extends into the mounting hole 94. A gas channel 95 is provided inside the base 91. A ventilation interface 96 is provided on the base 91. The ventilation interface 96 is connected to the gas channel 95. The gas channel 95 is connected to the mounting hole 94. The pressure ring 92 is pressed on the body of the air pressure sensor to be tested. The pressure ring 92 is fixed to the base 91 by the fixing bolt 93. Among them, the base 91 is a hexagonal column structure, six sensors can be installed, and the central area is a vertical ventilation interface 96. It should be noted that the shape of the base 91 and the number of installed sensors can be changed according to actual conditions, so there is no restriction here.

[0032] In one embodiment of the utility model, the air pressure sensor to be tested is electrically connected to the controller 2 through an analog-to-digital conversion module, and the controller 2 is connected to a touch screen. The controller 2 receives the signal of the air pressure sensor to be tested through the analog-to-digital conversion module, and displays it on the touch screen, and the technician observes and determines the state of the sensor to be tested.

[0033] The specific use process of the utility model is as follows: the technician sets the test parameters in the controller 2 according to the test needs, and the test parameters include but are not limited to the positive pressure duration, the negative pressure duration, the number of positive and negative pressure cycles, etc. Before the test, the sensor to be tested is first installed in the sealed installation box 9, and then the ventilation interface 96 of the sealed installation box 9 is connected to the test interface on the installation box 10, and the air source 1 inlet on the installation box 10 is connected to the air source 1, and the electromagnetic reversing valve is manually controlled to switch to the positive pressure channel through the touch screen, and the positive pressure regulating valve is adjusted to adjust the positive pressure to the size required for the test, and then the electromagnetic reversing valve is manually controlled to switch to the negative pressure channel through the touch screen, and the vacuum regulating valve is adjusted to adjust the negative pressure to the size required for the test. After the preparation is completed, the automatic test is started, and the controller 2 performs positive and negative pressure tests in sequence according to the preset control program.

[0034] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A durability test system for an air pressure sensor, characterized in that: include: An air source (1), a controller (2), a directional control valve (3), a vacuum generator (4), a vacuum pressure regulating valve (5), a vacuum solenoid valve (6), a positive pressure regulating valve (7), a positive pressure solenoid valve (8) and a sealing installation box (9), wherein the control ends of the directional control valve (3), the vacuum solenoid valve (6) and the positive pressure solenoid valve (8) are all electrically connected to the controller (2), and the air source (1) is connected to the input port of the directional control valve (3); An output port of the directional control valve (3) is connected to the gas source (1) inlet of the vacuum generator (4), the vacuum port of the vacuum generator (4) is connected to a gas source (1) port of the vacuum air-pressure valve (5), another gas source (1) port of the vacuum air-pressure valve (5) is connected to a gas source (1) port of the vacuum solenoid valve (6), and another gas source (1) port of the vacuum solenoid valve (6) is connected to the gas source (1) input port of the sealing installation box (9); Another output port of the directional control valve (3) is connected to an air source (1) port of the positive pressure regulating valve (7), another air source (1) port of the positive pressure regulating valve (7) is connected to an air source (1) port of the positive pressure solenoid valve (8), and another air source (1) port of the positive pressure solenoid valve (8) is connected to an air source (1) input port of the sealing installation box (9); The sealed installation box (9) is used to install the air pressure sensor to be tested, the vacuum generator (4) is used to generate negative pressure by relying on the air flow of the air source (1), and the controller (2) is used to control the positive and negative pressures in the sealed installation box (9) through the directional control valve (3), the vacuum solenoid valve (6) and the positive pressure solenoid valve (8).

2. The durability testing system for an air pressure sensor as claimed in claim 1, characterized in that: The air source (1) input port of the sealed installation box (9) is respectively connected to the positive pressure solenoid valve (8) and the vacuum solenoid valve (6) via a three-way connector (13).

3. The durability testing system for an air pressure sensor as claimed in claim 1, characterized in that: The controller (2), the directional control valve (3), the vacuum generator (4), the vacuum solenoid valve (6), and the positive pressure solenoid valve (8) are all installed in an installation box (10); the vacuum pressure regulating valve (5) and the positive pressure regulating valve (7) are installed on the side of the installation box (10); a power supply (14) is provided in the installation box (10); the power supply (14) is used to supply power to the controller (2).

4. The air pressure sensor durability test system according to claim 3, characterized in that: The power supply (14) is connected to the controller (2) via a protection relay.

5. The air pressure sensor durability test system according to claim 1, characterized in that: The air source (1) is generated by an air compressor (11), and the air compressor (11) is connected to the directional control valve (3) via an air source triplet (12).

6. The durability testing system for an air pressure sensor as claimed in claim 1, characterized in that: The sealed installation box (9) comprises: a base (91), a pressure ring (92), and a fixing bolt (93); the base (91) is provided with a plurality of installation holes (94); the air pressure detection port of the air pressure sensor to be tested extends into the installation hole (94); a gas channel (95) is provided inside the base (91); a vent interface (96) is provided on the base (91); the vent interface (96) is communicated with the gas channel (95); the gas channel (95) is communicated with the installation hole (94); the pressure ring (92) is pressed on the main body of the air pressure sensor to be tested; the pressure ring (92) is fixed to the base (91) by the fixing bolt (93).

7. The air pressure sensor durability test system according to claim 1, characterized in that: The controller (2) is a PLC controller.

8. The air pressure sensor durability testing system according to claim 1, characterized in that: The air pressure sensor to be tested is electrically connected to the controller (2) via an analog-to-digital conversion module, and the controller (2) is connected to a touch screen.

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