An air differential pressure sensor field calibration device

Abstract

Ventilation systems are common fluid distribution systems in industrial and building sectors, and differential air pressure sensors are crucial in these systems. Inaccurate measurements by differential air pressure sensors can severely impact the safe, reliable, and energy-efficient operation of ventilation systems. This invention provides a field calibration device for differential air pressure sensors, comprising: a high-pressure transformer, a low-pressure transformer, a high-pressure transformer safety valve, a low-pressure transformer safety valve, a high-pressure transformer inlet valve, a low-pressure transformer inlet valve, a high-pressure transformer connection valve, a low-pressure transformer connection valve, a standard differential air pressure sensor, an air pressurization device, a check valve, a pressure relief valve, a serial port server, and a controller. Compared to existing technologies, this invention enables convenient and rapid calibration of field-installed differential air pressure sensors, improving their measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of fluid transport and distribution technology, and in particular to an on-site calibration device for an air differential pressure sensor. Background Technology

[0002] Ventilation systems are common fluid distribution systems in industrial and building sectors. Differential air pressure sensors are crucial sensors in ventilation systems, playing a vital role in ensuring their safe, reliable, and energy-efficient operation. However, in practical engineering, due to site limitations, the measurements from differential air pressure sensors are not always entirely accurate, and the readings can drift over time, significantly impacting the normal operation of the ventilation system. Therefore, to improve the accuracy of differential air pressure sensors, on-site calibration is necessary.

[0003] In the prior art, differential pressure sensor calibration devices are generally used for laboratory calibration and are not suitable for field calibration. This is because: (1) the measured values ​​of differential pressure sensors in the field are often not displayed locally, but on a remote monitoring platform, while the standard pressure data of differential pressure sensor calibration devices in the prior art are generally only displayed locally, making comparison inconvenient; (2) in the prior art, differential pressure sensor calibration devices generally adjust the pressure by manually adding or removing weights, which is inefficient. The number of differential pressure sensors installed in the field is very large, and multi-point calibration is required in a short time, which the prior art cannot meet. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the problems existing in the background technology, this utility model provides an on-site calibration device for air differential pressure sensors. Compared with the prior art, this utility model can conveniently and quickly calibrate on-site installed air differential pressure sensors, thereby improving the measurement accuracy of on-site installed air differential pressure sensors.

[0006] (II) Technical Solution

[0007] This utility model provides an on-site calibration device for an air differential pressure sensor, comprising:

[0008] The high-voltage transformer is a straight, round metal tube that is closed at both ends;

[0009] The low-pressure unit is a straight, round metal tube closed at both ends;

[0010] A high-pressure transformer safety valve is connected to the side wall of the high-pressure transformer;

[0011] A safety valve for the low-pressure unit is connected to the side wall of the low-pressure unit;

[0012] The high-pressure transformer inlet valve is connected to the side wall of the high-pressure transformer;

[0013] The low-pressure pack inlet valve is connected to the side wall of the low-pressure pack;

[0014] High-pressure transformer connecting valves are connected to the side wall of the high-pressure transformer, n in number, where n≥2;

[0015] Low-pressure unit connecting valves are connected to the side wall of the low-pressure unit, n in total, n≥2;

[0016] A standard air differential pressure sensor has a high-pressure air interface, a low-pressure air interface, and a data output interface. The standard air differential pressure sensor has high measurement accuracy. The high-pressure air interface of the standard air differential pressure sensor is connected to a high-pressure package connecting valve, and the low-pressure air interface of the standard air differential pressure sensor is connected to a low-pressure package connecting valve.

[0017] An air pressurization device has an air inlet, an air outlet, and a bidirectional data transmission interface. The air inlet of the air pressurization device is connected to the side wall of the low-pressure package. The air pressurization device is electrically driven and equipped with a frequency converter.

[0018] A one-way valve has an air inlet end and an air outlet end. The air inlet end of the one-way valve is connected to the air outlet end of the air pressurization device, and the air outlet end of the one-way valve is connected to the side wall of the high-pressure pack.

[0019] The pressure relief valve has an air inlet end, an air outlet end, and a bidirectional data transmission interface. The air inlet end of the pressure relief valve is connected to the side wall of the high-pressure transformer, and the air outlet end of the pressure relief valve is connected to the side wall of the low-pressure transformer. The pressure relief valve is electrically driven.

[0020] A serial port server has a data input interface and a data output interface, wherein the data input interface of the serial port server is connected to the data output interface of the standard air differential pressure sensor.

[0021] The controller has at least one data input interface and at least three bidirectional data transmission interfaces. The data input interface of the controller is connected to the data output interface of the serial server. The first bidirectional data transmission interface of the controller is connected to the bidirectional data transmission interface of the air pressurization device. The second bidirectional data transmission interface of the controller is connected to the bidirectional data transmission interface of the pressure relief valve. The third bidirectional data transmission interface of the controller is connected to an external communication network.

[0022] Furthermore, the air pressurization device is an air compressor, a fan, or an air pump.

[0023] The method of using this utility model is as follows:

[0024] Close all the high-pressure transformer connection valves and all the low-pressure transformer connection valves.

[0025] Connect the high-pressure air interface of the differential pressure sensor to be calibrated to an available high-pressure coil connection valve, and the low-pressure air interface to an available low-pressure coil connection valve. Open the high-pressure coil connection valve and the low-pressure coil connection valve connected to the high-pressure and low-pressure air interfaces of the differential pressure sensor to be calibrated. Open the high-pressure coil connection valve and the low-pressure coil connection valve connected to the high-pressure and low-pressure air interfaces of the standard differential pressure sensor.

[0026] Open the high-pressure coil inlet valve and the low-pressure coil inlet valve to allow ambient air to enter the high-pressure coil and the low-pressure coil, respectively. Then, close the high-pressure coil inlet valve and the low-pressure coil inlet valve.

[0027] The controller continuously issues commands and transmits them to the air pressurization device and the pressure relief valve to adjust the operating frequency of the air pressurization device and the opening degree of the pressure relief valve, thereby controlling the pressure difference between the high-pressure pack and the low-pressure pack within a predetermined value.

[0028] The measured values ​​from the standard differential air pressure sensor are transmitted to the controller via the serial port server. The measured values ​​from the differential air pressure sensor to be calibrated on-site are read from the existing monitoring platform.

[0029] The measured values ​​of the standard differential air pressure sensor and the measured values ​​of the differential air pressure sensor to be calibrated on site are compared to complete the calibration of the differential air pressure sensor to be calibrated on site. There are two ways to do this comparison: (1) The controller transmits the measured values ​​of the standard differential air pressure sensor to the original monitoring platform through the communication network, and the comparison is completed on the original monitoring platform; (2) The original monitoring platform transmits the measured values ​​of the differential air pressure sensor to be calibrated on site to the controller through the communication network, and the comparison is completed on the controller.

[0030] The one-way valve prevents uncontrolled air flow from the high-pressure pack to the low-pressure pack.

[0031] The high-pressure transformer safety valve and the low-pressure transformer safety valve are in the closed state by default. When the pressure difference between the high-pressure transformer and the external environment is too large or too small, the high-pressure transformer safety valve will automatically open. When the pressure difference between the low-pressure transformer and the external environment is too large or too small, the low-pressure transformer safety valve will automatically open.

[0032] (III) Beneficial Effects

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) Convenient comparison. In the prior art, the measured values ​​of the air differential pressure sensor installed on site are displayed on the original monitoring platform, while the measured values ​​of the standard air differential pressure sensor are displayed locally, making comparison between the two very inconvenient. In this utility model, the measured values ​​of the standard air differential pressure sensor and the air differential pressure sensor to be calibrated on site are compared on the controller or the original monitoring platform, which is very convenient.

[0035] (2) High operating efficiency. The adjustment of the pressure difference between the high-pressure pack and the low-pressure pack, the comparison of the measured values ​​of the standard air differential pressure sensor and the air differential pressure sensor to be calibrated on site, etc. can all be completed automatically, with high operating efficiency. A large number of air differential pressure sensors installed on site can be calibrated at multiple points in a short time. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 An air differential pressure sensor field calibration device is provided for Embodiment 1 of this utility model. Detailed Implementation

[0038] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details. The utility model will be further described below with reference to the accompanying drawings.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] Example 1

[0041] like Figure 1 As shown, this embodiment provides an air differential pressure sensor field calibration device, including:

[0042] High-pressure transformer 1 is a straight circular metal tube closed at both ends;

[0043] Low-pressure unit 2 is a straight circular metal tube closed at both ends;

[0044] The high-pressure transformer safety valve 3 is connected to the side wall of the high-pressure transformer 1;

[0045] The low-pressure unit safety valve 4 is connected to the side wall of the low-pressure unit 2;

[0046] The high-pressure transformer inlet valve 5 is connected to the side wall of the high-pressure transformer 1;

[0047] The low-pressure unit inlet valve 6 is connected to the side wall of the low-pressure unit 2;

[0048] High-pressure transformer connecting valve 7 is connected to the side wall of high-pressure transformer 1, n in number, n≥2;

[0049] Low-pressure unit connection valve 8 is connected to the side wall of low-pressure unit 2, n in total, n≥2;

[0050] The standard air differential pressure sensor 9 has a high-pressure air interface, a low-pressure air interface and a data output interface. The standard air differential pressure sensor 9 has high measurement accuracy. The high-pressure air interface of the standard air differential pressure sensor 9 is connected to a high-pressure transformer connecting valve 7, and the low-pressure air interface of the standard air differential pressure sensor 9 is connected to a low-pressure transformer connecting valve 8.

[0051] The air pressurization device 10 has an air inlet end, an air outlet end and a bidirectional data transmission interface. The air inlet end of the air pressurization device 10 is connected to the side wall of the low-pressure package 2. The air pressurization device 10 is electrically driven and has a frequency converter.

[0052] The one-way valve 11 has an air inlet end and an air outlet end. The air inlet end of the one-way valve 11 is connected to the air outlet end of the air pressurization device 10, and the air outlet end of the one-way valve 11 is connected to the side wall of the high-pressure transformer 1.

[0053] The pressure relief valve 12 has an air inlet end, an air outlet end and a bidirectional data transmission interface. The air inlet end of the pressure relief valve 12 is connected to the side wall of the high-pressure transformer 1, and the air outlet end of the pressure relief valve 12 is connected to the side wall of the low-pressure transformer 2. The pressure relief valve 12 is electrically driven.

[0054] The serial port server 13 has a data input interface and a data output interface. The data input interface of the serial port server 13 is connected to the data output interface of the standard air differential pressure sensor 9.

[0055] The controller 14 has at least one data input interface and at least three bidirectional data transmission interfaces. The data input interface of the controller 14 is connected to the data output interface of the serial server 13. The first bidirectional data transmission interface of the controller 14 is connected to the bidirectional data transmission interface of the air pressurization device 10. The second bidirectional data transmission interface of the controller 14 is connected to the bidirectional data transmission interface of the pressure relief valve 12. The third bidirectional data transmission interface of the controller 14 is connected to an external communication network.

[0056] Furthermore, the air pressurization device 10 is an air compressor, fan, or air pump.

[0057] The usage method of this embodiment is as follows:

[0058] Close all n high-pressure pack connection valves 7 and all n low-pressure pack connection valves 8.

[0059] Connect the high-pressure air interface of the differential pressure sensor to be calibrated to an idle high-pressure coil connection valve 7, and the low-pressure air interface to an idle low-pressure coil connection valve 8. Open the high-pressure coil connection valves 7 and 8 connected to the high-pressure and low-pressure air interfaces of the differential pressure sensor to be calibrated. Open the high-pressure coil connection valves 7 and 8 connected to the high-pressure and low-pressure air interfaces of the standard differential pressure sensor 9.

[0060] Open the high-pressure coil inlet valve 5 and the low-pressure coil inlet valve 6 to allow ambient air to enter the high-pressure coil 1 and the low-pressure coil 2, respectively. Then, close the high-pressure coil inlet valve 5 and the low-pressure coil inlet valve 6.

[0061] The controller 14 continuously issues commands and transmits them to the air pressurization device 10 and the pressure relief valve 12 to adjust the operating frequency of the air pressurization device 10 and the opening degree of the pressure relief valve 12, thereby controlling the pressure difference between the high-pressure pack 1 and the low-pressure pack 2 at a predetermined value.

[0062] The measured value of the standard air differential pressure sensor 9 is transmitted to the controller 14 via the serial port server 13. The measured values ​​of the air differential pressure sensors to be calibrated on site are read through the existing monitoring platform.

[0063] The measured values ​​of the standard differential pressure sensor 9 and the measured values ​​of the differential pressure sensor to be calibrated on site are compared to complete the calibration of the differential pressure sensor to be calibrated on site. There are two ways to do this comparison: (1) The controller 14 transmits the measured values ​​of the standard differential pressure sensor 9 to the original monitoring platform through the communication network, and the comparison is completed on the original monitoring platform; (2) The original monitoring platform transmits the measured values ​​of the differential pressure sensor to be calibrated on site to the controller 14 through the communication network, and the comparison is completed on the controller 14.

[0064] One-way valve 11 prevents air from flowing uncontrollably from high-pressure unit 1 to low-pressure unit 2.

[0065] Safety valve 3 for the high-pressure coil and safety valve 4 for the low-pressure coil are closed by default. Safety valve 3 automatically opens when the pressure difference between the high-pressure coil 1 and the ambient environment is too large or too small. Similarly, safety valve 4 automatically opens when the pressure difference between the low-pressure coil 2 and the ambient environment is too large or too small.

[0066] Compared with the prior art, this embodiment has the following beneficial effects:

[0067] (1) Convenient comparison. In the prior art, the measured values ​​of the air differential pressure sensor installed on site are displayed on the original monitoring platform, while the measured values ​​of the standard air differential pressure sensor are displayed locally, making comparison between the two very inconvenient. In this utility model, the measured values ​​of the standard air differential pressure sensor 9 and the air differential pressure sensor to be calibrated on site are compared on the controller 14 or the original monitoring platform, which is very convenient.

[0068] (2) High operating efficiency. The operation of adjusting the pressure difference between the high-pressure pack 1 and the low-pressure pack 2, comparing the measured values ​​of the standard air differential pressure sensor 9 and the air differential pressure sensor to be calibrated on site can all be completed automatically. The operation efficiency is high, and a large number of air differential pressure sensors installed on site can be calibrated at multiple points in a short time.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A field calibration device for an air differential pressure sensor, characterized in that, include: The high-voltage transformer is a straight, round metal tube that is closed at both ends; The low-pressure unit is a straight, round metal tube closed at both ends; A high-pressure transformer safety valve is connected to the side wall of the high-pressure transformer; A safety valve for the low-pressure unit is connected to the side wall of the low-pressure unit; The high-pressure transformer inlet valve is connected to the side wall of the high-pressure transformer; The low-pressure pack inlet valve is connected to the side wall of the low-pressure pack; High-pressure transformer connecting valves are connected to the side wall of the high-pressure transformer, n in number, where n≥2; Low-pressure unit connecting valves are connected to the side wall of the low-pressure unit, n in total, n≥2; A standard air differential pressure sensor has a high-pressure air interface, a low-pressure air interface, and a data output interface. The standard air differential pressure sensor has high measurement accuracy. The high-pressure air interface of the standard air differential pressure sensor is connected to a high-pressure transformer connection valve, and the low-pressure air interface of the standard air differential pressure sensor is connected to a low-pressure transformer connection valve. An air pressurization device has an air inlet, an air outlet, and a bidirectional data transmission interface. The air inlet of the air pressurization device is connected to the side wall of the low-pressure package. The air pressurization device is electrically driven and equipped with a frequency converter. A one-way valve has an air inlet end and an air outlet end. The air inlet end of the one-way valve is connected to the air outlet end of the air pressurization device, and the air outlet end of the one-way valve is connected to the side wall of the high-pressure pack. The pressure relief valve has an air inlet end, an air outlet end, and a bidirectional data transmission interface. The air inlet end of the pressure relief valve is connected to the side wall of the high-pressure transformer, and the air outlet end of the pressure relief valve is connected to the side wall of the low-pressure transformer. The pressure relief valve is electrically driven. A serial port server has a data input interface and a data output interface, wherein the data input interface of the serial port server is connected to the data output interface of the standard air differential pressure sensor. The controller has at least one data input interface and at least three bidirectional data transmission interfaces. The data input interface of the controller is connected to the data output interface of the serial server. The first bidirectional data transmission interface of the controller is connected to the bidirectional data transmission interface of the air pressurization device. The second bidirectional data transmission interface of the controller is connected to the bidirectional data transmission interface of the pressure relief valve. The third bidirectional data transmission interface of the controller is connected to an external communication network.

2. The air differential pressure sensor field calibration device as described in claim 1, characterized in that, The air pressurization device is an air compressor, fan, or air pump.

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