Temperature and humidity detector for wet air in pipeline

Abstract

The utility model discloses a temperature and humidity detector for wet air in a pipeline, and belongs to the field of fluid detection. The temperature and humidity detector comprises a temperature and humidity detector main body and is characterized in that the temperature and humidity detector main body is formed by connecting a junction box, a connecting device, a connecting pipe, a sealing device, a protection pipe and a humidity sensitive element from top to bottom, a membrane assembly is arranged on the outer wall of the bottom of the protection pipe, and the membrane assembly is connected with a driver on the sealing device through a guide rod. In order to solve the problem that the measurement error is multiplied when an existing temperature and humidity detector for wet air in a pipeline is under an extreme working condition (relative humidity is smaller than 10% or larger than 90%), based on a thermodynamic humidity measurement principle, fog drops entrained in the wet air are isolated by adopting a microporous breathable film, so that the influence of the fog drops on a humidity sensitive element is avoided; generation of condensed water drops of the humidity-sensitive element is weakened, accurate detection of the water vapor content of the humid air is achieved, and a technical means is provided for accurate analysis of the thermal process of the humid air. The device realizes automatic detection, and is high in measurement precision and convenient to install.

Description

Technical Field

[0001] The utility model discloses a temperature and humidity detector for wet air in a pipeline, belonging to the field of fluid detection. Background Art

[0002] Air temperature and humidity are crucial for industrial production, environmental regulation, and daily life. Humidification or dehumidification are often required to regulate the temperature and humidity of moist air. Measuring the temperature and humidity of moist air is particularly important in this process. Existing moist air thermometers for industrial pipelines measure temperature with high accuracy, but humidity measurements suffer from significant errors. Humidity measurement is often designed based on moist air thermodynamics, using hygroscopic elements to capture water vapor in moist air and determine the humidity value. However, condensation on the outer surface of hygroscopic elements significantly affects humidity measurement. Measurement errors increase exponentially when the humidity exceeds 90%.

[0003] In the context of high-quality development, how to improve the measurement accuracy of temperature and humidity of wet air fluid in pipelines and accelerate equipment upgrades are issues that need to be urgently addressed. Utility Model Content

[0004] Aiming at the problem of high-precision measurement of the temperature and humidity of wet air in existing pipelines, the utility model discloses a temperature and humidity detector for wet air in pipelines. The temperature and humidity detector has high automated detection accuracy, a compact and novel structure, and can provide good support for the development of high-level equipment.

[0005] A temperature and humidity detector for wet air in a pipeline, comprising a temperature and humidity detector body, characterized in that the temperature and humidity detector body is mainly composed of a connecting device, a connecting pipe, a protective pipe, a humidity sensitive element, a membrane assembly, a sealing device and a junction box;

[0006] The sealing device further comprises a nut, a gasket and a driver, wherein the nut, gasket and driver are arranged in sequence from top to bottom;

[0007] The junction box is a rectangular parallelepiped structure, with a temperature display screen and a humidity display screen arranged in parallel on its front. A power interface and a data interface are symmetrically arranged on the bottom of the junction box. The power interface and the data interface are connected to the power line and the data line respectively.

[0008] The connecting device is located directly below the junction box, the connecting pipe is located between the connecting device and the sealing device, the protective tube is located between the sealing device and the humidity sensitive element, the membrane assembly is located on the outer wall of the protective tube, and guide rods are symmetrically provided between the membrane assembly and the driver.

[0009] The above-mentioned wet air temperature and humidity detector in the pipeline is characterized in that: in order to achieve accurate detection under extreme working conditions (relative humidity greater than 90%), it is required to avoid the formation of water droplets on the humidity sensitive element and reduce the influence of droplets in the humid air. The above-mentioned membrane assembly is the same length as the humidity sensitive element, and the membrane assembly can be moved downward to the end of the humidity sensitive element through the guide rod and covered on the periphery of the humidity sensitive element.

[0010] The above-mentioned wet air temperature and humidity detector in a pipeline is characterized in that: in order to reduce the interference of droplets on the humidity sensitive element, the above-mentioned membrane assembly should be composed of a supporting frame and a microporous breathable membrane, and the above-mentioned microporous breathable membrane is located on the inner side of the supporting frame.

[0011] The above-mentioned wet air temperature and humidity detector in a pipeline is characterized in that: considering the diversity and corrosiveness of the detected fluid, the above-mentioned microporous breathable membrane is preferably a polytetrafluoroethylene microporous breathable membrane.

[0012] The driver is a micro motor with a gear at the output end of the micro motor, and the upper end of one of the guide rods has a rack shape that can mesh with the gear.

[0013] The driver is an electromagnetic push rod, and the end of the electromagnetic push rod is fixed to the upper end of one of the guide rods.

[0014] The humid air temperature and humidity detector in a pipeline is characterized by comprising the following working process: first, a junction box, a connecting tube, a protective tube, and a humidity-sensitive element are sequentially connected through a connecting device and a sealing device to assemble a main body of the temperature and humidity meter; the membrane assembly is connected to the driver through a guide rod; then, a power line and a data line are connected to the junction box through a power interface and a data interface, and an electronic data acquisition module is installed;

[0015] Then, the main body of the thermometer and hygrometer is placed in the wet air pipe and sealed and tightened with gaskets and nuts. When the wet air in the pipe flows through the humidity sensitive element, the temperature and humidity of the wet air will be displayed in real time on the temperature display and the humidity display. When the wet air is in normal working conditions, that is, the relative humidity is between 10-90%, the driver pulls up the membrane assembly through the guide rod, and the water vapor content of the wet air is directly measured by the humidity sensitive element; when the wet air is in extreme working conditions, that is, the relative humidity is less than 10% or greater than 90%, the driver drives the support frame of the membrane assembly to move downward to the end of the humidity sensitive element. At this time, the membrane assembly just covers the periphery of the humidity sensitive element, and the microporous breathable membrane in the membrane assembly effectively isolates the droplets that may exist in the wet air, and the water vapor passes through the microporous breathable membrane and is measured by the humidity sensitive element, thereby obtaining the temperature and humidity parameters of the wet air fluid in the pipe.

[0016] The beneficial effects of the present invention are as follows: This invention addresses the problem of exponentially increased measurement errors in existing in-pipe wet air temperature and humidity detectors under extreme operating conditions (relative humidity less than 10% or greater than 90%). Based on the measurement principle of wet air thermodynamics, this invention discloses a novel in-pipe wet air temperature and humidity detector. This device utilizes a porous breathable membrane to isolate mist droplets entrained in the wet air, thereby preventing the mist droplets from affecting the measurement of the humidity-sensitive element. This device effectively detects the water vapor content in the wet air and provides a technical means for accurate analysis of the wet air thermodynamic process. The device achieves automated detection, high detection accuracy, and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the proposed wet air temperature and humidity detector in pipelines under normal working conditions.

[0018] Figure 2 It is a structural schematic diagram of the proposed wet air temperature and humidity detector in pipelines under extreme working conditions.

[0019] Figure 3 This is the main view of the temperature and humidity detector.

[0020] Figure 4 This is the right view of the temperature and humidity detector.

[0021] Figure 5 This is a bottom view of the temperature and humidity detector.

[0022] Figure 6 This is the measurement deviation distribution diagram of Class A hygrometers used in existing engineering pipelines.

[0023] The reference numbers in the figure are: 1-thermohygrometer body; 2-temperature display screen; 3-power interface; 4-power cord; 5-connecting device; 6-connecting tube; 7-guide rod; 8-protective tube; 9-humidity sensitive element; 10-membrane assembly; 11-sealing device; 12-data cable; 13-data interface; 14-junction box; 15-humidity display screen; 101-support frame; 102-microporous breathable membrane; 111-nut; 112-gasket; 113-driver. DETAILED DESCRIPTION

[0024] The specific implementation method of the present invention is as follows: first, the junction box 14, the connecting tube 6, the protective tube 8 and the humidity-sensitive element 9 are connected in sequence through the connecting device 5 and the sealing device 11 to assemble the thermometer body 1, and the membrane assembly 10 is connected to the driver 113 through the guide rod 7; then, the power line 4 and the data line 12 are connected to the junction box through the power interface 3 and the data interface 13, and the electronic data acquisition module is installed.

[0025] Then, the thermometer body 1 is placed in the wet air pipe and sealed and tightened by the nut 111 and the gasket 112. When the wet air in the pipe flows through the humidity sensitive element 9, the temperature and humidity of the wet air will be displayed in real time on the temperature display screen 2 and the humidity display screen 15. When the wet air is in normal working conditions, that is, the relative humidity is between 10-90%, the driver 113 pulls up the membrane assembly 10 through the guide rod 7, and the water vapor content of the wet air is directly measured by the humidity sensitive element 9; when the wet air is in extreme working conditions, that is, the relative humidity is less than 10% or greater than 90%, the support frame 101 of the membrane assembly 10 is driven downward by the driver 113 to move to the end of the humidity sensitive element 9. At this time, the membrane assembly 10 just covers the periphery of the humidity sensitive element 9, and the microporous breathable membrane 102 in the membrane assembly 10 effectively isolates the droplets that may exist in the wet air, and the water vapor passes through the microporous breathable membrane 102 and is measured by the humidity sensitive element 9, and then the temperature and humidity parameters of the wet air fluid in the pipe are obtained.

Claims

1. A temperature and humidity detector for wet air in a pipeline, comprising a temperature and humidity detector body (1), characterized in that: The thermo-hygrometer body (1) is mainly composed of a connecting device (5), a connecting tube (6), a protective tube (8), a humidity-sensitive element (9), a membrane assembly (10), a sealing device (11) and a junction box (14); The sealing device (11) further comprises a nut (111), a gasket (112) and a driver (113), wherein the nut (111), the gasket (112) and the driver (113) are arranged in sequence from top to bottom; The junction box (14) is a rectangular parallelepiped structure, with a temperature display screen (2) and a humidity display screen (15) provided in parallel on its front surface. A power interface (3) and a data interface (13) are provided symmetrically on the left and right sides of the bottom surface of the junction box (14), and a power line (4) and a data line (12) are connected to the power interface (3) and the data interface (13), respectively. The connecting device (5) is located directly below the junction box (14), the connecting pipe (6) is located between the connecting device (5) and the sealing device (11), the protective tube (8) is located between the sealing device (11) and the humidity-sensitive element (9), the membrane assembly (10) is located on the outer wall of the protective tube (8), and a guide rod (7) is symmetrically provided between the membrane assembly (10) and the driver (113).

2. The instrument for detecting the temperature and humidity of wet air in a pipeline according to claim 1, characterized in that: The membrane assembly (10) is of the same length as the humidity sensitive element (9), and the membrane assembly (10) can be moved downward to the end of the humidity sensitive element (9) via the guide rod (7).

3. The instrument for detecting the temperature and humidity of wet air in a pipeline according to claim 1, characterized in that: The membrane assembly (10) comprises a support frame (101) and a microporous breathable membrane (102), wherein the microporous breathable membrane (102) is located inside the support frame (101).

4. The instrument for detecting the temperature and humidity of wet air in a pipeline according to claim 3, characterized in that: The microporous breathable membrane (102) is preferably a polytetrafluoroethylene microporous breathable membrane.

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