CN203024930U - Calibration device for wind pressure transducer - Google Patents

Abstract

The utility model discloses a wind pressure sensor calibration device. The calibration device includes a calibration system, a wind pressure sensor to be calibrated and an excitation system. The wind pressure sensor to be calibrated is placed directly below the calibration cylinder in the calibration system, and the vibration The vibration block in the system is placed in the water in the calibration cylinder, and the static wind pressure is calibrated according to the water level of the calibration cylinder and the output signal of the wind pressure sensor to be calibrated, and according to the vibration frequency of the vibration block in the calibration cylinder, the water level in the cylinder and the pressure sensor to be calibrated The output signal of the calibrated wind pressure sensor calibrates the dynamic wind pressure. The utility model has the advantages that not only the static wind pressure can be calibrated, but also the dynamic wind pressure can be calibrated by using the excitation system, which expands the function of the wind pressure sensor calibration device; there is no need to calibrate the wind pressure sensor to be calibrated with the help of a standard wind pressure sensor, And it has high precision to meet the engineering needs; it does not need more auxiliary equipment, the device is simple, the operation is convenient, the energy consumption is small, and the cost is saved.

Description

Wind pressure sensor calibration device

technical field

The utility model relates to the field of pressure sensor testing, in particular to a wind pressure sensor calibration device suitable for calibrating static wind pressure and dynamic wind pressure.

Background technique

Before using the wind pressure sensor to measure the wind pressure, the wind pressure sensor must first be calibrated to determine the relationship between its output and input. In the wind pressure measurement, the calibration of the wind pressure sensor is an indispensable and important step, and the measurement accuracy of the wind pressure sensor is one of the most important performance indicators for evaluating it. Therefore, the research on the wind pressure sensor calibration device and calibration method is very important, and its calibration accuracy will directly affect the measurement accuracy when it is used.

The measurement accuracy of the wind pressure sensor is an important indicator for evaluating its performance. Before using the wind pressure sensor for measurement, the wind pressure sensor must first be calibrated to determine the relationship between the output and input. The calibration accuracy of the calibration device will directly affect the measurement accuracy of the wind pressure sensor. Therefore, it is very important to choose a suitable wind pressure sensor calibration device for the wind pressure sensor to play its function.

The existing wind pressure sensor calibration device is generally divided into two types: one is a piston calibration device, which is composed of an oil cylinder, a piston and a weight, and the pressure is determined by the ratio between the mass of the weight and the cross-sectional area of the piston. size, thereby calibrating the wind pressure sensor. The operation of this piston-type calibration device is complicated. In order to improve the measurement accuracy and eliminate the frictional resistance loaded on the piston, many auxiliary equipment are used, and the cost is high, so it is difficult to be widely used. Another calibration device is to use a pressure pump to generate pressure, display the pressure generated by a standard wind pressure sensor, and then apply the same pressure to the wind pressure sensor to be calibrated, thereby calibrating the wind pressure sensor. This calibration device needs more auxiliary equipment, consumes a lot of energy, and is complicated to operate. At the same time, the magnitude of the applied pressure needs to be displayed with the help of a standard wind pressure sensor. The accuracy of pressure measurement is determined by the accuracy of the standard wind pressure sensor. In the case of wind pressure sensors, it is difficult to meet the calibration requirements.

Utility model content

The technical problem to be solved by the utility model is to provide a simple, convenient and precise wind pressure sensor calibration device to meet the calibration requirements of static wind pressure and dynamic wind pressure required for on-site measurement.

In order to solve the above technical problems, the utility model provides a wind pressure sensor calibration device, the calibration device includes a calibration system, a wind pressure sensor to be calibrated and an excitation system, and the wind pressure sensor to be calibrated is placed in the calibration cylinder of the calibration system The vibration block in the excitation system is placed in the water in the calibration cylinder, and the static wind pressure is calibrated according to the water level of the calibration cylinder and the output signal of the wind pressure sensor to be calibrated, and according to the vibration frequency of the vibration block in the calibration cylinder , The water level in the cylinder and the output signal of the wind pressure sensor to be calibrated are used to calibrate the dynamic wind pressure.

The positioning rod in the calibration system is vertically fixed on the base, the positioning rod is covered with a sleeve that moves along the rod axis, the lower part of the positioning rod is provided with a plurality of positioning holes, and the sleeve is fixed on the positioning rod through positioning bolts. Two parallel connecting rods are connected, the connecting rods are connected with a collar, and the fixed calibration cylinder is clamped in the collar.

There is a scale on the cylinder body of the calibration cylinder, and there is water in the cylinder. The bottom of the cylinder is covered with a layer of elastic film for simulating uniform wind pressure, and there is a water outlet valve at the bottom of the cylinder wall.

The diameter of the calibration cylinder is consistent with the size of the force-bearing element of the wind pressure sensor to be calibrated.

The vibrating object in the calibration tank water is connected with a transmission line, the other end of the transmission line is fixed on the pulley frame, and the transmission line is sleeved in the groove of the fixed pulley and the eccentric runner, one end of the pulley frame is connected with the fixed pulley, and the other end is connected with the fixed pulley. One end is fixed on the support frame, and the top platform of the support frame is provided with a motor, and the rotating shaft of the motor is connected with the eccentric runner.

The calibration method of the wind pressure sensor calibration device of the present invention comprises the following steps:

(1) Place the wind pressure sensor to be calibrated on the base of the calibration system so that it is directly below the calibration cylinder;

(2) Adjust the height of the sleeve so that the film at the bottom of the calibration cylinder completely covers the surface of the force-bearing element of the wind pressure sensor to be calibrated, insert the positioning bolt into the positioning hole, and fix the position of the sleeve and the calibration cylinder;

(3) According to the range of the wind pressure sensor to be calibrated, divide the entire range into several equidistant points, convert the corresponding wind pressure value at each subpoint to the corresponding water surface height, and inject water at the corresponding height into the calibration cylinder to calibrate static wind pressure;

(4) When it is necessary to calibrate the dynamic wind pressure, place the vibrating object in the water of the calibration cylinder, adjust the rotation frequency of the motor according to the frequency of the pulsating wind pressure to be simulated, and drive the eccentric runner to rotate, so that the contact position of the eccentric runner The transmission line moves up and down, and the transmission line bypasses the fixed pulley, so that the vibrating mass suspended at the end of the transmission line moves up and down according to the corresponding frequency, thereby changing the height of the water surface in the calibration cylinder, thereby simulating the dynamic wind pressure.

The beneficial effects of the utility model are reflected in:

1) The utility model can not only calibrate the static wind pressure, but also can calibrate the dynamic wind pressure by using the excitation system, which expands the function of the wind pressure sensor calibration device;

2) The utility model does not need to use a standard wind pressure sensor to calibrate the wind pressure sensor to be calibrated, and has high precision to meet engineering requirements;

3) The utility model does not need more auxiliary equipment, the device is simple, the operation is convenient, the energy consumption is small, and the cost is saved.

Description of drawings

Fig. 1 is the schematic diagram of the plane structure of the wind pressure sensor calibration device of the present invention;

Fig. 2 is a three-dimensional structural schematic diagram of the wind pressure sensor calibration device of the present invention;

Fig. 3 is a detailed view of the calibration cylinder structure of the wind pressure sensor calibration device of the present invention.

Explanation of symbols in the figure

1 - calibration system;

11 - base; 12 - positioning rod;

13-Positioning hole; 14-Positioning bolt;

15-sleeve; 16-connecting rod;

17 - collar;

18 - calibration cylinder;

181-barrel body; 182-scale scale;

183-film; 184-outlet valve;

2 - Exciting system;

21-support frame; 22-motor;

23 - rotating shaft; 24 - eccentric runner;

25 - pulley frame; 26 - fixed pulley;

27 - drive line; 28 - vibrating block;

3 - Wind pressure sensor to be calibrated.

Detailed ways

The structure of the wind pressure sensor calibration device will be described in detail below with reference to the drawings and specific embodiments.

As shown in Figures 1 and 2, the utility model provides a wind pressure sensor calibration device, which includes a calibration system 1, a wind pressure sensor 3 to be calibrated and an excitation system 2, and a wind pressure sensor 3 to be calibrated Placed directly under the calibration cylinder 18 in the calibration system 1, the vibration block 28 in the vibration excitation system 2 is placed in the water in the calibration cylinder 18, and calibrated according to the water level of the calibration cylinder 18 and the output signal of the wind pressure sensor 3 to be calibrated For the static wind pressure, the dynamic wind pressure is calibrated according to the vibration frequency of the vibration block 28 in the calibration cylinder 18, the water level in the cylinder and the output signal of the wind pressure sensor 3 to be calibrated.

The positioning rod 12 in the calibration system 1 is vertically fixed on the base 11. The positioning rod 12 is covered with a sleeve 15 that moves along the rod axis. The lower part of the positioning rod 12 is provided with a plurality of positioning holes 13. The positioning hole 13 is fixed on the positioning rod 12, the sleeve 15 is connected with two parallel connecting rods 16, the connecting rods 16 are connected with a collar 17, and a calibration cylinder 18 is clamped in the collar 17.

The diameter of the calibration cylinder 18 is consistent with the size of the force-bearing element of the wind pressure sensor 3 to be calibrated.

The vibration block 28 in the water of the calibration cylinder 18 is connected with a transmission line 27, the other end of the transmission line 27 is fixed on the pulley frame 25, and the transmission line 27 is enclosed within the groove of the fixed pulley 26 and the eccentric runner 24, and the pulley Frame 25 one end is connected with fixed pulley 26, and the other end is fixed on the supporting frame 21, and supporting frame 21 top platforms are provided with motor 22, and the rotating shaft of motor 22 is connected with 23 eccentric runners 24.

As shown in Figure 3, there is a scale scale 182 on the cylinder body 181 of the calibration cylinder 18, there is water in the cylinder, and a layer of elastic film 183 for simulating uniform wind pressure is placed on the bottom of the cylinder, and there is a water outlet valve at the bottom of the cylinder wall 184.

The calibration method of the calibration device of the wind pressure sensor of the present invention will be described below in conjunction with the aforementioned calibration device. The specific steps are:

(1) The wind pressure sensor 3 to be calibrated is placed on the base 11 of the calibration system 1 so that it is located directly below the calibration cylinder 18 . Adjust the height of the sleeve 15 so that the film 183 at the bottom of the calibration cylinder 18 is about 0.5 cm away from the surface of the force-bearing element of the wind pressure sensor 3 to be calibrated.

(2) Secondly, connect the measurement line of the wind pressure sensor 3 to be calibrated, and observe the output signal of the wind pressure sensor 3 to be calibrated, which is the output in the no-load state. Slowly lower the height of the sleeve 15 so that the film 183 at the bottom of the calibration cylinder 18 just completely covers the surface of the force-bearing element of the wind pressure sensor 3 to be calibrated, and once the height of the sleeve 15 is lowered again, when the output signal changes immediately, set the positioning bolt 14 is inserted into the positioning hole 13 to fix the position of the sleeve 15 and the calibration cylinder 18. Check each spare part in the device to ensure that each spare part is installed accurately and securely, and the wind pressure sensor calibration device is adjusted.

(3) According to the measuring range of the wind pressure sensor 3 to be calibrated, divide the whole measuring range into a number of equally spaced points, convert the corresponding wind pressure value at each subpoint into the corresponding water surface height, close the water outlet valve 184, and inject into the calibration cylinder 18 For the water at the corresponding height, record the output signal value of the wind pressure sensor at different heights; after reaching the measuring range, open the water outlet valve 184, and slowly reduce the water in the calibration cylinder 18 to zero. According to the principle of sensor calibration, the calibration curve is fitted after repeated measurements to calibrate the static wind pressure.

(4) When it is necessary to calibrate the dynamic wind pressure, close the water outlet valve 184, inject water of a corresponding height into the calibration cylinder 18, place the vibrating block 28 in the water of the calibration cylinder 18, and adjust according to the frequency of the pulsating wind pressure to be simulated. The frequency of rotation of the motor 22 drives the eccentric runner 24 to rotate, so that the transmission line 27 at the contact position with the eccentric runner 24 moves up and down, and the transmission line 27 bypasses the fixed pulley 26, so that the vibrating object 28 suspended at the end of the transmission line 27 according to The corresponding frequency moves up and down, thereby changing the height of the water surface in the calibration cylinder 18, thereby simulating the dynamic wind pressure.

The above description of the wind pressure sensor calibration device is to facilitate the understanding and application of the utility model by those of ordinary skill in the technical field. Those skilled in the art can easily make various modifications to this wind pressure sensor calibration device, and apply the general principles described here to other wind pressure sensor calibration devices without creative efforts. Therefore, the utility model is not limited to the embodiments here, and improvements and modifications made by those skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims (5)

1. A wind pressure sensor calibration device, characterized in that: the calibration device includes a calibration system, a wind pressure sensor to be calibrated and an excitation system, the wind pressure sensor to be calibrated is placed directly below the calibration cylinder in the calibration system, and the excitation The vibration block in the vibration system is placed in the water in the calibration cylinder, and the static wind pressure is calibrated according to the water level of the calibration cylinder and the output signal of the wind pressure sensor to be calibrated. According to the vibration frequency of the vibration block in the calibration cylinder, the water level in the cylinder and the The output signal of the wind pressure sensor to be calibrated is used to calibrate the dynamic wind pressure. 2. The wind pressure sensor calibration device according to claim 1, characterized in that: the positioning rod in the calibration system is vertically fixed on the base, the positioning rod is covered with a sleeve that moves along the rod axis, and the lower part of the positioning rod is provided with A plurality of positioning holes, the sleeve is fixed on the positioning rod through positioning bolts, the sleeve is connected with two parallel connecting rods, the connecting rod is connected with a collar, and a calibration cylinder is clamped in the collar. 3. The wind pressure sensor calibration device according to claim 1 or 2, characterized in that: there is a scale on the cylinder body of the calibration cylinder, there is water in the cylinder, and a layer is placed on the bottom of the cylinder to simulate uniform wind pressure The elastic film has a water outlet valve at the lower part of the cylinder wall. 4 . The wind pressure sensor calibration device according to claim 3 , wherein the diameter of the calibration cylinder is consistent with the size of the force-bearing element of the wind pressure sensor to be calibrated. 5. The wind pressure sensor calibration device according to claim 1, characterized in that: the vibrating object in the water in the calibration tank is connected to a transmission line, the other end of the transmission line is fixed on the pulley frame, and the transmission line is sleeved on the fixed In the groove of the pulley and the eccentric runner, one end of the pulley frame is connected with the fixed pulley, and the other end is fixed on the supporting frame. The platform on the top of the supporting frame is provided with a motor, and the rotating shaft of the motor is connected with the eccentric runner.

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