CN216386860U - Three show HP-U dew point hygrometer - Google Patents

Abstract

The utility model discloses a three-display HP-U dew point hygrometer, comprising a gas temperature display device, a relative humidity display device, a dew point temperature display device, a relative humidity calculator, a first gas detection chamber and a second gas detection chamber, and an inlet pipe connected to the first gas detection chamber and the second gas detection chamber, the bottom of the inner cavity of the first gas detection chamber and the second gas detection chamber is provided with a dew point mirror, the first gas detection chamber and the second gas detection chamber are provided with a dew point mirror The gas detection chamber is equipped with resistance thermometers, the first gas detection chamber is provided with a semiconductor refrigerator installed at the bottom of the dew point mirror, and the tops of the inner chambers of the first gas detection chamber and the second gas detection chamber are provided with Reflecting photoresistor, scattering photoresistor and light source, the DC adjusting power supply receives the signal transmitted from the contrast device and adjusts the magnitude of the direct current to control the cooling capacity of the semiconductor refrigerator. The utility model has the characteristics of accurate measurement.

Description

A three-display HP-U dew point hygrometer

technical field

The utility model relates to the technical field of dew point detection, in particular to a three-display HP-U dew point hygrometer.

Background technique

In engineering, air temperature and humidity are two related thermal parameters, and they are equally important. For example, in the electronics industry, the air humidity determines the yield of electronic products; in the textile industry, the fiber strength is affected by the relative humidity in the air; in the printing industry, the air humidity determines the printing quality.

In the natural gas industry, the presence of moisture in natural gas will have an impact on natural production, processing, gathering and transportation and other processes. For example, if the moisture contained in natural gas is too high, it will cause blockage at the throttle valve due to throttling and cooling of ice-water mixture; if there is a problem with liquid water during the transportation of natural gas pipelines, it will accelerate the corrosion rate of acid components on the pipe wall and related components , which will not only adversely affect the service life of the pipeline, but also adversely affect the operation and management efficiency of natural gas enterprises. The moisture content of natural gas is an important indicator in the natural gas industry, and there are strict requirements for the moisture in natural gas. The "Code for Design of Gas Pipeline Engineering" GB50251-2003 stipulates that the dew point of water in pipeline natural gas should be 5°C lower than the minimum ambient temperature under transmission conditions. Accurate determination of the moisture content of natural gas is critical to the natural gas industry.

The water content in the gas can be expressed by the water dew point, and its saturated water content depends on the temperature, pressure and composition of the gas. When the water vapor content in the gas reaches saturation under a certain pressure, the temperature at which condensation begins is called the natural gas water dew point temperature (hereinafter referred to as the dew point temperature), and the existing measurement mechanism has the defect of inaccurate measurement. Therefore, we improved this and proposed a three-display HP-U dew point hygrometer.

Utility model content

In order to solve the above-mentioned technical problems, the utility model provides the following technical solutions:

The utility model is a three-display HP-U dew point hygrometer, which comprises a gas temperature display device, a relative humidity display device, a dew point temperature display device, a relative humidity calculator, a first gas detection chamber and a second gas detection chamber, and a third gas detection chamber and a second gas detection chamber. An intake pipe connecting the gas detection chamber and the second gas detection chamber, the bottom of the inner cavity of the first gas detection chamber and the second gas detection chamber is provided with a dew point mirror, the first gas detection chamber and the second gas detection chamber The chambers are equipped with resistance thermometers, the first gas detection chamber is provided with a semiconductor refrigerator installed at the bottom of the dew point mirror, and the gas temperature display instrument is electrically connected to the resistance thermometer in the second gas detection chamber; The humidity display instrument is electrically connected with the relative humidity calculator; the relative humidity calculator is electrically connected with the resistance thermometer in the first gas detection chamber and the resistance thermometer in the second gas detection chamber; The resistance thermometer is electrically connected with the dew point temperature display instrument, the resistance thermometer in the second gas detection chamber is electrically connected with the gas temperature display instrument; the semiconductor refrigerator is electrically connected with a DC regulating power supply; the first gas detection chamber and The second gas detection chamber is provided with a cleaning mechanism for cleaning the surface of the dew point mirror. The tops of the inner cavities of the first gas detection chamber and the second gas detection chamber are provided with a reflection photoresistor, a scattering photoresistor and a light source, and an amplifier is connected to the reflection photoresistor and the scattering photoresistor via a photoelectric bridge circuit, and the amplifier A contrast device is electrically connected, and the contrast device is electrically connected with a DC regulating power supply, and the DC regulating power supply receives a signal transmitted from the contrast device and adjusts the magnitude of the DC current to control the cooling capacity of the semiconductor refrigerator.

As a preferred technical solution of the present invention, a protective gas inlet pipe is connected to the air inlet pipe, the end of the protective gas inlet pipe is connected to a nitrogen storage tank, and the protective gas inlet pipe is provided with a nitrogen storage tank. With nitrogen control valve.

As a preferred technical solution of the present invention, both the first gas detection chamber and the second gas detection chamber are provided with pressure gauges for detecting internal pressure values.

As a preferred technical solution of the present invention, the first gas detection chamber and the second gas detection chamber are provided with a gas release pipe, and an outlet control valve is provided on the gas release pipe.

As a preferred technical solution of the present invention, the air inlet pipe is respectively connected to the first gas detection chamber and the second gas detection chamber through the conveying branch pipe, and the conveying branch pipe is provided with an inlet control valve.

As a preferred technical solution of the present invention, the inlet end of the air inlet pipe is provided with a fan.

As a preferred technical solution of the present invention, the cleaning mechanism includes a base plate arranged on the periphery of the dew point mirror, a pair of parallel reciprocating screw rods and a limit polishing rod are arranged on the base plate, and the reciprocating screw rod is provided with A sliding block reciprocating along the reciprocating screw rod, the limiting polished rod is provided with a limiting sliding sleeve that moves along the limiting polished rod, and a scraper for cleaning the surface of the dew point mirror is installed on the sliding block and the limiting sliding sleeve.

The beneficial effects of the present utility model are:

The three-display HP-U dew point hygrometer transmits the measured gas to the gas detection room by setting the first gas detection room and the second gas detection room, and firstly uses the measured gas to purge the detection room to remove the original gas detection room. There is gas, and it is sealed and static to stabilize the pressure of the gas to be measured, eliminate the influence of pressure on the measurement results, and automatically clean the dew point mirror by setting the dew point mirror cleaning mechanism to ensure that the surface of the dew point mirror is clean and smooth, reducing errors; The two sets of photoelectric signals are compared to determine the dew point formation, which can not only measure the dew point and relative humidity of clean gas, but also measure the dew point and relative humidity of gas with pollutants such as dust and fibers, and has a wider range of applications; at the same time, it can display the dew point temperature , gas temperature and relative humidity, simple operation, easy to use.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. In the attached image:

Fig. 1 is the structural representation of a kind of three-display HP-U dew point hygrometer of the present utility model;

2 is a schematic structural diagram of a cleaning mechanism of a three-display HP-U dew point hygrometer of the present invention.

In the figure: 1. Gas temperature indicator; 2. Relative humidity indicator; 3. Dew point temperature indicator; 4. Relative humidity calculator; 5. The first gas detection chamber; 6. The second gas detection chamber; 7. Reflection Photoresistor; 8. Scattering photoresistor; 9. Light source; 10. Dew point mirror; 11. Resistance thermometer; 12. Semiconductor refrigerator; 17. Protective gas inlet pipe; 18. Nitrogen storage tank; 20. Nitrogen control valve; 21. Pressure gauge; 22. Bleed pipe; 23. Outlet control valve; Air pipeline; 27, cleaning mechanism; 28, reciprocating screw; 29, limit polished rod; 30, slider; 31, limit sliding sleeve; 32, scraper; 33, base plate; 34, fan.

Detailed ways

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model, but not to limit the present utility model.

Example: As shown in Figure 1 and Figure 2, a three-display HP-U dew point hygrometer of the present invention includes a gas temperature display device 1, a relative humidity display device 2, a dew point temperature display device 3, and a relative humidity calculator 4 , the first gas detection chamber 5 and the second gas detection chamber 6, and the intake pipe 26 connected with the first gas detection chamber 5 and the second gas detection chamber 6, the first gas detection chamber 5 and the second gas detection chamber 5 The bottom of the inner cavity of the chamber 6 is provided with a dew point mirror 10, the first gas detection chamber 5 and the second gas detection chamber 6 are provided with resistance thermometers 11, and the first gas detection chamber 5 is provided with a resistance thermometer 11. The semiconductor refrigerator 12 at the bottom of the dew point mirror, the gas temperature indicator 1 is electrically connected to the resistance thermometer 11 in the second gas detection chamber 6 to display temperature data; the relative humidity indicator 2 is electrically connected to the relative humidity calculator 4 connected to display relative humidity data; the relative humidity calculator 4 is electrically connected with the resistance thermometer 11 in the first gas detection chamber 5 and the resistance thermometer 11 in the second gas detection chamber 6, and calculates the first gas detection chamber through a built-in program 5 and the relative humidity data of the second gas detection chamber 6; the resistance thermometer 11 in the first gas detection chamber 5 is electrically connected to the dew point temperature indicator 3, and the resistance thermometer 11 in the second gas detection chamber 6 is connected to the gas temperature The display instrument 1 is electrically connected; the semiconductor refrigerator 12 is electrically connected with a DC regulating power supply 13; the first gas detection chamber 5 and the second gas detection chamber 6 are provided with a cleaning mechanism 27 for cleaning the surface of the dew point mirror 10 . The tops of the inner cavities of the first gas detection chamber 5 and the second gas detection chamber 6 are provided with a reflective photoresistor 7, a scattering photoresistor 8 and a light source 9. The reflective photoresistor 7 and the scattering photoresistor 8 pass through a photoelectric bridge circuit. 14 is connected to an amplifier 15, which is electrically connected to a comparator 16, and the comparator 16 is electrically connected to a DC regulating power supply 13, which receives the signal transmitted from the comparator 16 and regulates the amount of DC current. size, to control the cooling capacity of the semiconductor refrigerator 12. The photoelectric bridge circuit 14 is connected with the reflective photoresistor 7, the scattering photoresistor 8 and the amplifier 15, and converts the received optical signals of the reflective photoresistor 7 and the scattering photoresistor 8 into electrical signals, and transmits the electrical signals to the amplifier 15, The reflective photoresistor 7 is installed in the gas detection chamber, receives the light reflected by the dew point mirror 10, and transmits the optical signal to the photoelectric bridge circuit 14 connected to it;

The scattering photoresistor 8 is installed in the gas detection chamber, receives the light scattered by the dew point mirror 10, and transmits the light signal to the photoelectric bridge circuit 14 connected to it;

The light source 9 is installed in the gas detection chamber, and emits light on the surface of the dew point mirror 10 . The dew point mirror 10 is installed in the first gas detection chamber 5 and the second gas detection chamber 6 , and is connected with the platinum thermal resistance thermometer 11 , and receives the light emitted by the light source 9 for reflection or scattering. The amplifier 15, connected with the photoelectric bridge circuit 14 and the comparator 16, receives the electrical signal transmitted from the photoelectric bridge circuit 14, amplifies it, and transmits it to the comparator 16;

The DC regulating power supply 13 is connected with the comparator 16 and the semiconductor refrigerator 12, receives the signal transmitted from the comparator 16, and adjusts the magnitude of the DC current to control the cooling capacity of the semiconductor refrigerator 12;

The comparator 16 is connected with the amplifier 15 and the DC power supply 13, and the converted and amplified signals transmitted from the first gas detection chamber 5 and the second gas detection chamber 6 are compared by the built-in analyzer, and the comparison signals are compared. It is transmitted to the DC regulating power supply 13, and the magnitude of the DC current is adjusted to control the cooling capacity of the semiconductor refrigerator 1212.

Two sets of identical photoelectric systems are installed in the first gas detection chamber 5 and the second gas detection chamber 6 respectively. A semiconductor refrigerator 12 is installed below the dew point mirror 10 in the first gas detection chamber 5 , and there is no semiconductor refrigerator 12 below the dew point mirror 10 in the first gas detection chamber 5 . In the first gas detection chamber 5, with the cooling of the semiconductor refrigerator 12, the temperature of the dew point mirror 10 decreases, and when the dew point temperature reaches the dew point temperature, condensate is formed on the mirror surface. However, there is no temperature drop in the second gas detection chamber 6, and there is only dust on the surface of the dew point mirror 10 (if the gas to be measured is clean enough, the surface of the dew point mirror 10 is clean and free). Therefore, when the dew point temperature of the gas is reached, different photoelectric signals will be generated when the light source 9 illuminates the surface of the dew point mirror 10. The signals are compared by the comparator 16 installed downstream of the photoelectric system to control the DC power supply 13, thereby controlling the semiconductor refrigeration. cooling capacity of the appliance 12.

A resistance thermometer 11 is installed under the dew point mirror 10 in the first gas detection chamber 5 and the second gas detection chamber 6 to measure the dew point temperature and the temperature of the gas to be measured, and display them through the dew point thermometer and the gas temperature display device 1 . The dew point temperature and the gas temperature are respectively correlated with the saturated water vapor pressure, and the relative humidity is calculated by the relative humidity calculator 4 and displayed on the relative humidity display device 2 . Therefore, the measured gas temperature indicator 1, the dew point temperature indicator 3, and the relative humidity indicator 2 form a three-display system, which can read relevant data in real time, saving time and effort, and is simple and convenient.

In the first gas detection chamber 5, the temperature of the gas to be detected in the detection chamber is cooled by the semiconductor refrigerator 12. Before reaching the dew point temperature, the surface conditions of the two dew point mirrors 10 are the same (clean gas: nothing on the surface of the dew point mirror 10; polluted gas: The surface of the dew point mirror 10 has dust, fibers, etc.), and the light emitted by the light source 9 is irradiated on the surface of the dew point mirror 10, and its reflection and scattering are the same. DC adjusts the current of the power supply 13, increases the cooling capacity, and reduces the temperature of the dew point mirror 10; when the first gas detection chamber 5 reaches the dew point temperature, the water vapor in the gas condenses on the dew point mirror 10, and there is no gas in the second gas detection chamber 6. The refrigerator has no condensation phenomenon on the surface of the dew point mirror 10. The surface conditions of the two dew point mirrors 10 are different, the reflection and scattering of light change, and the light signal received by the photoresistor changes. After signal amplification and comparison, the DC power is adjusted down. 13 current, reduce the cooling capacity, and automatically increase the temperature of the dew point mirror 10; when there is no condensation, it will automatically reduce the temperature of the dew point mirror 10, and finally make the temperature of the dew point mirror 10 reach dynamic equilibrium, and the temperature at this time is the measured gas. The dew point temperature is measured by the resistance thermometer 11 and displayed on the dew point temperature indicator 3 . At the same time, the measured temperature of the resistance thermometer 11 installed under the dew point mirror 10 in the second gas detection chamber 6 is the measured gas temperature, which is displayed by the gas temperature display device 1 . The dew point temperature and gas temperature signals are transmitted to the relative humidity calculator 4 , and the relative humidity data is calculated by the built-in program and displayed through the relative humidity display device 2 .

The utility model uses the fan 34 to transport the measured gas to the first gas detection chamber 5 and the second gas detection time, and firstly cleans the surface of the dew point mirror 10 to ensure that the surface of the dew point mirror 10 is smooth and clean, and then purges the gas detection chamber , remove the original gas in the gas detection chamber; then close the outlet control valve 23, continue to inflate until the indoor gas pressure value reaches 100KPa, close the fan 34 and the inlet control valve 25, close and stand, stabilize the pressure of the gas to be measured, and eliminate the pressure on the measurement impact on results. If dust, fibers and other pollutants contained in the gas will be deposited on the surface of the dew point mirror 10 .

The air inlet pipe 26 is connected with a protective gas inlet pipe 17 , the end of the protective gas inlet pipe 17 is connected to the nitrogen storage tank 18 , and the protective gas inlet pipe 17 is provided with a nitrogen control valve 20 .

The first gas detection chamber 5 and the second gas detection chamber 6 are both provided with a pressure gauge 21 for detecting the internal pressure value, to detect the pressure value in the first gas detection chamber 5 and the second gas detection chamber 6 .

The first gas detection chamber 5 and the second gas detection chamber 6 are both provided with a gas release pipe 22, and an outlet control valve 23 is provided on the gas release pipe 22 to control the flow state of the gas.

The intake pipe 26 is respectively connected with the first gas detection chamber 5 and the second gas detection chamber 6 through the delivery branch pipe 24 , and the delivery branch pipe 24 is provided with an inlet control valve 25 .

A fan 34 is provided at the inlet end of the air inlet duct 26 .

The cleaning mechanism 27 includes a base plate 33 arranged on the periphery of the dew point mirror 10 . 28 Reciprocating sliding block 30, the limiting polished rod 29 is provided with a limiting sliding sleeve 31 that moves along the limiting polished rod 29, the sliding block 30 and the limiting sliding sleeve 31 are installed with a cleaning device for the surface of the dew point mirror 10. Scraper 32, wherein the reciprocating screw 28 is driven by a motor, before the instrument is used, open the cleaning mechanism 27 to clean the dirt on the surface of the dew point mirror to ensure the accuracy of this measurement. After the measurement, open the cleaning mechanism 27 to clean the dirt on the surface of the dew point mirror to ensure that the backstab measurement does not contaminate the dew point mirror and ensure the accuracy of the next measurement. The reciprocating screw drives the scraper 32 to reciprocate to clean the dew point mirror surface to clean.

Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, its The technical solutions described in the foregoing embodiments can still be modified, or some technical features thereof can be equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (7)

1. A three-display HP-U dew point hygrometer, comprising a gas temperature indicator (1), a relative humidity indicator (2), a dew point temperature indicator (3), a relative humidity calculator (4), a first gas detector chamber (5) and a second gas detection chamber (6), and an air inlet pipe (26) connected with the first gas detection chamber (5) and the second gas detection chamber (6), characterized in that: the first gas detection chamber (5) and the second gas detection chamber (6) are connected A dew point mirror (10) is provided at the bottom of the inner cavity of the gas detection chamber (5) and the second gas detection chamber (6), and the first gas detection chamber (5) and the second gas detection chamber (6) are provided with a dew point mirror (10). A resistance thermometer (11) is provided, the first gas detection chamber (5) is provided with a semiconductor refrigerator (12) installed at the bottom of the dew point mirror, and the gas temperature indicator (1) is connected to the second gas detection chamber ( The resistance thermometer (11) in 6) is electrically connected; the relative humidity indicator (2) is electrically connected to the relative humidity calculator (4); the relative humidity calculator (4) is electrically connected to the first gas detection chamber (5). The resistance thermometer (11) in ) is electrically connected with the resistance thermometer (11) in the second gas detection chamber (6); the resistance thermometer (11) in the first gas detection chamber (5) is connected to the dew point temperature display instrument ( 3) Electrical connection, the resistance thermometer (11) in the second gas detection chamber (6) is electrically connected with the gas temperature display instrument (1); the semiconductor refrigerator (12) is electrically connected with a DC regulating power supply (13) ); the first gas detection chamber (5) and the second gas detection chamber (6) are provided with a cleaning mechanism (27) for cleaning the surface of the dew point mirror (10), and the first gas detection chamber (5) and the top of the inner cavity of the second gas detection chamber (6) are provided with a reflection photoresistor (7), a scattering photoresistor (8) and a light source (9), the reflection photoresistor (7), scattering photoresistor (8) An amplifier (15) is connected via the photoelectric bridge circuit (14), the amplifier (15) is electrically connected with a contrast device (16), and the contrast device (16) is electrically connected with a DC regulating power supply (13), and the DC regulating The power supply (13) receives the signal transmitted from the comparator (16), and adjusts the magnitude of the direct current to control the cooling capacity of the semiconductor refrigerator (12). 2. a kind of three-display HP-U dew point hygrometer according to claim 1, is characterized in that, described air inlet pipe (26) is connected with protective gas inlet pipe (17), described protective gas inlet The end of the pipeline (17) is connected to a nitrogen storage tank (18), and a nitrogen control valve (20) is provided on the protective gas inlet pipeline (17). 3. a kind of three-display HP-U dew point hygrometer according to claim 2, is characterized in that, described first gas detection chamber (5) and second gas detection chamber (6) are all provided with internal pressure Pressure gauge (21) for value detection. 4. a kind of three-display HP-U dew point hygrometer according to claim 2, is characterized in that, described first gas detection chamber (5) and second gas detection chamber (6) are all provided with vent pipe ( 22), an outlet control valve (23) is provided on the air release pipe (22). 5. a kind of three-display HP-U dew point hygrometer according to claim 2, is characterized in that, described air inlet duct (26) is respectively connected with first gas detection chamber (5) and the first gas detection chamber (5) and the first gas detection chamber (5) and the first gas detection chamber (5) and the first gas detection chamber (5) through the conveying branch pipe (24) respectively. The two gas detection chambers (6) are connected, and an inlet control valve (25) is arranged on the conveying branch pipe (24). 6 . The three-display HP-U dew point hygrometer according to claim 1 , wherein a fan ( 34 ) is provided at the inlet end of the air intake duct ( 26 ). 7 . 7. A three-display HP-U dew point hygrometer according to claim 1, wherein the cleaning mechanism (27) comprises a substrate (33) arranged on the periphery of the dew point mirror (10), and the substrate ( 33) A pair of parallel reciprocating screw rods (28) and limit polished rods (29) are provided on the reciprocating screw rod (28), and a slider (30) reciprocating along the reciprocating screw rod (28) is provided on the reciprocating screw rod (28), A limit sliding sleeve (31) that moves along the limit polished rod (29) is provided on the limit polished rod (29), and a dew point mirror (10) is installed on the slider (30) and the limit sliding sleeve (31). ) surface cleaning scraper (32).

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