Throw-in type high-temperature dew point measurement sensor

Abstract

The utility model relates to a throw-in type high-temperature dew point measuring sensor, which comprises a shell and a crystal resonator, a flange-shaped fixing part is formed on the outer wall of the shell, the shell is limited into an upper part and a lower part by the fixing part, and the lower half part of the shell is inserted into a gas environment or a cavity to be detected; an air chamber for refrigeration is formed in the shell, and the air chamber is provided with an air inlet and an air outlet; the bottom of the shell is provided with a containing cavity communicated with the air chamber, the crystal resonator is fixed in the containing cavity, and the crystal resonator outputs resonant frequency parameters or equivalent electrical parameters of the crystal resonator through a first lead. According to the invention, the method can achieve the judgment of the dew formation moment in a high-temperature environment, and achieves the measurement of the dew point temperature on the basis.

Description

Technical Field

[0001] This utility model relates to an immersion-type high-temperature dew point measurement sensor. Background Technology

[0002] Among various humidity measurement methods, apart from the dew point method, other methods are easily affected by temperature changes and struggle to maintain high accuracy over a wide temperature range. Dew point sensors, however, are not subject to such limitations. With the rapid development of defense science and technology industry weaponry and equipment, the demand for calibration and traceability of high-temperature dew point or high-temperature relative humidity parameters is increasing. This is particularly true for large weapons systems using fuel cells as power sources, nuclear submarines powered by nuclear fuel, and large ships, all of which involve high-temperature dew point, high-temperature and high-humidity environments, sometimes with test environments exceeding 100°C. Additionally, some industrial drying sectors also require humidity measurements in high-temperature environments.

[0003] However, current methods for detecting dew point rely on manual, handheld testing, which is susceptible to inaccuracies due to limitations in instrument performance and personnel skill. Therefore, a submersible high dew point measurement sensor structure needs to be designed to address these issues and meet the measurement requirements for high dew points. Summary of the Invention

[0004] The purpose of this invention is to provide an immersion-type high-temperature dew point measurement sensor that can determine the condensation time in a high-temperature environment and measure the dew point temperature accordingly.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides an immersion-type high-temperature dew point measurement sensor, which includes a housing and a crystal resonator:

[0007] The outer wall of the housing forms a flange-shaped fixing part, which defines the housing into upper and lower parts. The lower half of the housing is inserted into the gas environment or cavity to be tested.

[0008] The interior of the housing is formed with a cooling air chamber, which has an air inlet and an air outlet.

[0009] The bottom of the housing is provided with a receiving cavity communicating with the air chamber. The crystal resonator is fixed in the receiving cavity, and the crystal resonator outputs its resonant frequency parameter or equivalent electrical parameter through the first lead.

[0010] Optionally, the longitudinal section of the air chamber is U-shaped, the two ends of the air chamber are the air inlet and the air outlet, respectively, and the accommodating cavity is located at the bottom of the air chamber.

[0011] Optionally, a slot is provided at the bottom of the housing, one side of the slot is connected to the accommodating cavity, a thermistor is fixed in the slot, and the detection end of the thermistor is in contact with the lower surface of the crystal resonator in the accommodating cavity, for sensing and detecting the temperature of the lower surface of the crystal resonator and outputting the corresponding sensing data through the second lead.

[0012] Optionally, at least one lead output cavity is provided inside the housing, penetrating the upper and lower surfaces of the housing, and the first lead and the second lead are led out from the upper surface of the housing through the lead output cavity.

[0013] Optionally, the thermistor is a platinum resistance thermometer.

[0014] Optionally, the fixing part is an annular flange disposed on the outer side wall of the housing, and the height of the fixing part is 0.8~1.5 cm.

[0015] Optionally, the relationship between the height L of the fixing part from the bottom of the housing and the height H of the housing is that H / 2≤L≤2H / 3.

[0016] Optionally, in use, room temperature air is introduced through the air inlet, and the room temperature air cools the upper surface of the crystal resonator through the air chamber, while the lower surface of the crystal resonator contacts the gas environment to be detected or the high-temperature gas in the cavity.

[0017] Optionally, the crystal resonator is cooled by the room temperature air introduced into the gas chamber and reaches a low temperature state, and the high temperature gas condenses upon contact with the lower surface of the crystal resonator, thus forming condensation.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] This invention relates to an immersion-type high-temperature dew point measurement sensor, which utilizes air at room temperature to cool a crystal resonator made of quartz crystal electrodes in a high-temperature environment. This allows condensation to form on the surface of the crystal resonator under temperature differences. When condensation occurs, the resonant frequency or other equivalent electrical parameters of the crystal resonator change. In other words, the dew point is identified by changing the electrical parameters of the crystal resonator.

[0020] When the dew point occurs, temperature detection can be used to measure the dew point temperature. This process can be achieved by measuring the lower surface of the crystal resonator with another temperature sensor, or by adding a thermistor to the sensor housing to directly measure the temperature of the lower surface of the crystal resonator. In this way, the dew point temperature of the gas being measured can be obtained. Attached Figure Description

[0021] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0022] Figure 1 This is a cross-sectional structural schematic diagram of an immersion-type high-temperature dew point measuring sensor according to an embodiment of the present invention.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1. Crystal resonator; 2. Housing; 3. Air chamber; 4. Air inlet; 5. Air outlet; 6. Fixing part; 7. Thermistor; 8. Second lead; 9. Lead output cavity; 10. First lead. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] This embodiment provides an immersion-type high-temperature dew point measurement sensor, such as... Figure 1 As shown, it includes a housing 2 and a crystal resonator 1:

[0029] The outer wall of the housing 2 forms a flange-shaped fixing part 6, which defines the housing 2 into upper and lower parts. The lower half of the housing 2 is inserted into the gas environment or cavity to be tested.

[0030] The interior of the housing 2 forms a cooling air chamber 3, which has an air inlet 4 and an air outlet 5.

[0031] The bottom of the housing 2 is provided with a accommodating cavity that communicates with the air chamber 3. The crystal resonator 1 is fixed in the accommodating cavity. The crystal resonator 1 outputs its resonant frequency parameter or equivalent electrical parameter through the first lead 10.

[0032] In operation, room temperature air is introduced through the air inlet 4. This air cools the upper surface of the crystal resonator 1 via the air chamber 3, while the lower surface of the crystal resonator 1 contacts the gas environment to be tested or the high-temperature gas in the cavity. After being cooled by the room temperature air introduced through the air chamber 3, the crystal resonator 1 reaches a low temperature. The high-temperature gas condenses upon contact with the lower surface of the crystal resonator 1, forming condensation.

[0033] The immersion-type high-temperature dew point measurement sensor of this embodiment uses air at room temperature to cool the crystal resonator 1, which is made of quartz crystal electrodes in a high-temperature environment. This allows condensation to form on the surface of the crystal resonator 1 under the temperature difference between hot and cold. When condensation occurs, the resonant frequency or other equivalent electrical parameters of the crystal resonator 1 change. In other words, the dew point is identified by changing the electrical parameters of the crystal resonator 1.

[0034] When the dew point occurs, the temperature can be measured by temperature detection. This process can be achieved by measuring the lower surface of the crystal resonator 1 through another temperature sensor, or by adding a thermistor 7 in the sensor housing 2 to directly measure the temperature of the lower surface of the crystal resonator 1. In this way, the dew point temperature of the gas being measured can be obtained.

[0035] In one embodiment, a slot is provided at the bottom of the housing 2, and one side of the slot communicates with the accommodating cavity. A thermistor 7, which is a platinum resistance thermometer, is fixed in the slot. The detection end of the thermistor 7 contacts the lower surface of the crystal resonator 1 in the accommodating cavity, and is used to sense and detect the temperature of the lower surface of the crystal resonator 1 and output the corresponding sensing data through the second lead 8.

[0036] Inside the housing 2, at least one lead wire output cavity 9 is provided, penetrating the upper and lower surfaces of the housing 2. The first lead wire 10 and the second lead wire 8 are led out from the upper surface of the housing 2 through the lead wire output cavity 9. Figure 1 In the illustrated embodiment, the second lead 8 is shown to be led out from the lead output cavity 9, and the first lead 10 can be routed from this lead output cavity 9. Alternatively, another lead output cavity 9 can be provided in the housing 2 for routing. This can be designed independently as needed, and will not be described in detail here.

[0037] Specifically, preferably, the longitudinal section of the air chamber 3 is U-shaped, the two ends of the air chamber 3 are the air inlet 4 and the air outlet 5 respectively, and the accommodating cavity is located at the bottom of the air chamber 3.

[0038] The fixing part 6 is an annular flange disposed on the outer side wall of the housing 2, and the height of the fixing part 6 is 0.8~1.5 cm. In order to make the fixing part 6 stable, the setting position of the fixing part 6 relative to the housing 2 is limited, that is, the relationship between the setting position of the fixing part 6 and the height L of the bottom of the housing 2 and the height H of the housing 2 is H / 2≤L≤2H / 3.

[0039] The following is a specific example to illustrate this.

[0040] A crystal resonator 1, made of a quartz crystal with a resonant frequency of 10MHz, is fixed to the lower part of a cylindrical shell 2 made of polytetrafluoroethylene (PTFE) with a diameter of 4 cm and a height of 8.5 cm. The lower part of the shell 2 has a receiving cavity in which the crystal resonator 1 is fixedly installed. The upper side of the shell 2 has symmetrical air inlets 4 and outlets 55 with a diameter of 5 mm, and a lead output cavity 9 with a diameter of 3 mm that connects the upper and lower parts, allowing the first lead 10 and / or the second lead 8 to enter and exit. The interior of the shell 2 forms a cooling chamber 3. Cooling gas (generally a temperature controller) enters through the air inlet 4 of the chamber 3, contacts the upper surface of the crystal resonator 1 through the chamber 3, and then flows out of the chamber 3 through the air outlet 5. A PT100 platinum resistance thermometer 7, which serves as a thermistor, is attached to the lower surface of the crystal resonator 1 using a slot. The PT100 platinum resistance thermometer is used to measure the temperature of the lower surface of the crystal resonator 1 in real time. A PTFE ring (i.e., fixing part 6) with a diameter of 6 cm and a height of 1 cm is machined at a height of 5.5 cm (measured from the bottom of the housing 2 upwards). The fixing part 6 is used to fix the entire sensor. The electrode lead (first lead 10) of the crystal resonator 1 is led out from the upper side of the housing 2 to monitor the condensation phenomenon on the electrode surface of the quartz crystal resonator 1 in real time. At the same time, the data output lead (second lead 8) of the PT100 platinum resistance thermometer is led out from the upper side of the housing 2 to monitor the temperature of the lower surface of the crystal resonator 1 in real time.

[0041] The entire sensor is divided by the sensor fixing structure 6. The lower half of the housing 2 is placed inside the high-temperature gas pipeline within a temperature range of 90℃ to 200℃, while the upper half of the housing 2 is kept at room temperature. A gas pump introduces room temperature air (20℃ to 30℃) from the air inlet 4 into the cooling air chamber 3 inside the housing 2. As the room temperature air passes over the upper surface of the crystal resonator 1, it cools the quartz crystal resonator 1 through the temperature difference, causing condensation to form on the lower surface electrodes of the quartz crystal resonator 1. The gas is then discharged from the air outlet 5 in the housing 2, achieving gas circulation and cooling.

[0042] During the cooling process of crystal resonator 1 using room temperature air, the first lead 10 of crystal resonator 1 is connected to the oscillation circuit to keep crystal resonator 1 in a resonant state. As room temperature air flows in the air chamber 3, the surface temperature of crystal resonator 1 decreases, and the lower surface of crystal resonator 1 remains in the high-temperature gas to be measured. Due to the temperature difference, dew will condense on the lower surface of crystal resonator 1, resulting in condensation in the electrode area of ​​the lower surface of crystal resonator 1. At this time, the condensation of water on the electrode area of ​​the lower surface will cause the electrical parameters of crystal resonator 1 in the resonant state to change, thereby affecting the resonant frequency or equivalent electrical parameters of crystal resonator 1. The equivalent electrical parameters or resonant frequency of quartz crystal resonator 1 can be measured in real time using an impedance analyzer or frequency meter. When the equivalent electrical parameters or frequency of quartz crystal resonator 1 change abruptly, the temperature of the lower surface of quartz crystal resonator 1 sensed by PT100 platinum resistance thermometer is collected. This temperature is the dew point temperature of the high-temperature gas being measured.

[0043] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. An immersion-type high-temperature dew point measurement sensor, characterized in that, Includes housing and crystal resonator: The outer wall of the housing forms a flange-shaped fixing part, which defines the housing into upper and lower parts. The lower half of the housing is inserted into the gas environment or cavity to be tested. The interior of the housing is formed with a cooling air chamber, which has an air inlet and an air outlet. The bottom of the housing is provided with a receiving cavity communicating with the air chamber. The crystal resonator is fixed in the receiving cavity, and the crystal resonator outputs its resonant frequency parameter or equivalent electrical parameter through the first lead.

2. The immersion-type high-temperature dew point measurement sensor according to claim 1, characterized in that, The air chamber has a U-shaped longitudinal section, with the air inlet and air outlet at its two ends, respectively, and the accommodating cavity is located at the bottom of the air chamber.

3. The immersion-type high-temperature dew point measurement sensor according to claim 1, characterized in that, A slot is provided at the bottom of the housing, and one side of the slot communicates with the accommodating cavity. A thermal sensor is fixed in the slot, and the detection end of the thermal sensor contacts the lower surface of the crystal resonator in the accommodating cavity. The thermal sensor is used to sense and detect the temperature of the lower surface of the crystal resonator and output the corresponding sensing data through the second lead.

4. The immersion-type high-temperature dew point measurement sensor according to claim 3, characterized in that, Inside the housing, there is at least one lead output cavity that runs through the upper and lower surfaces of the housing. The first lead and the second lead are led out from the upper surface of the housing through the lead output cavity.

5. The immersion-type high-temperature dew point measurement sensor according to claim 3, characterized in that, The thermistor used is a platinum resistance thermometer.

6. The drop-in high temperature dew point measurement sensor of claim 1, wherein, The fixing part is an annular flange provided on the outer side wall of the housing, and the height of the fixing part is 0.8~1.5 cm.

7. The immersion-type high-temperature dew point measurement sensor according to claim 6, characterized in that, The relationship between the height L of the fixing part from the bottom of the housing and the height H of the housing is that H / 2≤L≤2H / 3.

8. The drop-in high temperature dew point measurement sensor of claim 1, wherein, In use, room temperature air is introduced through the air inlet, and the room temperature air cools the upper surface of the crystal resonator through the air chamber. The lower surface of the crystal resonator comes into contact with the gas environment to be detected or the high temperature gas in the cavity.

9. The drop-in high temperature dew point measurement sensor of claim 8, wherein, The crystal resonator is cooled by the room temperature air introduced through the air chamber and reaches a low temperature state. The high temperature gas condenses upon contact with the lower surface of the crystal resonator, thus forming condensation.

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