In-situ laser gas analyzer laser window lens protection structure

Abstract

The utility model discloses a protection structure for a laser window lens of an in-situ laser gas analyzer, which comprises a purging guide ring, a window lens support, a window lens compression ring and a purging shielding gas interface, and is characterized in that the purging guide ring, the window lens support and the window lens compression ring are respectively arranged in a window lens sleeve; the purging shielding gas interface is mounted on the window lens sleeve, and the window lens is positioned between the window lens support and the window lens compression ring; and the purging guide ring is positioned on the outer side of the window lens. When the protection structure is installed on the in-situ laser gas analyzer, when the in-situ laser gas analyzer works, the blowing protection airflow can effectively reduce the temperature of a laser window lens and stabilize the working temperature of the laser window lens; and external dust, particles, harmful gas and the like are prevented from polluting and corroding the window lens and blowing and cleaning the window lens.

Description

Technical Field

[0001] The utility model belongs to the technical field of in-situ laser gas analyzer products, and relates to a protection structure for a laser window lens of an in-situ laser gas analyzer. Background Art

[0002] An in-situ laser gas analyzer is a high-performance optical gas analysis instrument based on tunable diode laser absorption spectroscopy (TDLAS). It adopts an in-situ installation design and does not require a sampling pretreatment system. It can be directly installed near the measurement point to achieve fast response and high-precision gas analysis.

[0003] In practical applications, the in-situ laser analyzer is used to measure the gas component content of various flue gases or furnace exhaust gases. There are usually various dusts, particles, sulfurized and corrosive gases outside the optical window lens of the laser in the analyzer. The temperature of the measured gas is sometimes as high as 200 - 350 °C, which pollutes, corrodes and even causes thermal stress cracking of the optical window lens of the laser analyzer, ultimately leading to the failure or damage of the analysis.

[0004] The commonly used method for existing in-situ laser gas analyzer products is to set an air flow nozzle or air hole at the front end (outside the product) of the built-in laser window lens and introduce a protective gas to form an air curtain or air flow to isolate external pollutants. This method has some disadvantages: 1. The laser window lens is under the wrapping of a high-temperature external environment, and the component temperature conduction and internal and external light source radiation make its working temperature relatively high and the temperature fluctuation large. The protective gas cannot directly reach the laser window lens and has no cooling and constant temperature effect. 2. External pollution particles, dust, harmful gases, etc. occasionally come into contact with the laser window lens, and the protective gas cannot play a purging and cleaning function. Summary of the Invention

[0005] Aiming at the actual application problems of the above-mentioned in-situ laser gas analyzer products, the utility model develops a protection structure for a laser window lens, which is used to reduce or avoid the contact of dust, particles, high-temperature gases, etc. in the measured gas with the optical window lens of the analyzer laser (hereinafter referred to as "window lens"), protect and clean the window lens, reduce and stabilize the temperature of the window lens and the overall structure is stable. Ensure the normal use of the in-situ laser gas analyzer.

[0006] The technical solution adopted by the utility model is as follows:

[0007] An in-situ laser gas analyzer laser window lens protection structure, including a purging guide ring, a window lens holder, a window lens pressing ring, and a purging protection gas interface, is characterized in that: the purging guide ring, the window lens holder, and the window lens pressing ring are respectively installed inside a window lens sleeve, the purging protection gas interface is installed on the window lens sleeve, and the window lens is located between the window lens holder and the window lens pressing ring; and the purging guide ring is located outside the window lens.

[0008] The purging guide ring is integrally tubular convex in the middle and has a flat flange shape on the other side. There is an annular gas guiding groove at the connection between the flat flange shape and the tubular convex in the middle, and the purging protection gas interface communicates with the annular gas guiding groove.

[0009] The opening of the annular guiding groove of the purging guide ring faces the window lens.

[0010] There is a space between the annular gas guiding groove of the purging guide ring and the window lens holder, forming a protection gas flow buffer cavity.

[0011] There is an air flow gap between the tubular convex of the purging guide ring and the window lens holder and the window lens, forming a protection gas flow purging channel.

[0012] When the present utility model is in use, the purging protection gas flow enters the protection gas flow buffer cavity of the purging guide ring through the protection gas interface, changes direction and flows towards the window lens through the purging channel. After passing through the window lens and turning back, the protection gas flow flows out reversely from the center of the tubular convex pipe of the purging guide ring.

[0013] The beneficial effects of the present utility model are: by installing the protection structure of the present utility model on an in-situ laser gas analyzer, when the in-situ laser gas analyzer is working, the purging protection gas flow can effectively reduce and stabilize the working temperature of the laser window lens, prevent the pollution, corrosion of the window lens by external dust, particles, harmful gases, etc., and play a role in purging and cleaning the window lens. Brief Description of the Drawings

[0014] Figure 1 It is a cross-sectional view of the installation of the present utility model.

[0015] Figure 2 It is a schematic diagram of the use of the present utility model.

[0016] In the figure: 1 - window lens sleeve, 2 - purging guide ring, 3 - window lens holder, 4 - window lens pressing ring, 5 - purging protection gas interface, 6 - window lens, 7 - light source assembly, 8 - receiver assembly. Detailed Embodiment

[0017] The following further describes the present utility model in detail with reference to the drawings and specific embodiments, which is convenient for clearly understanding the present utility model, but they do not limit the present utility model.

[0018] As shown Figure 1 in the figure, a protection structure for the window lens of the laser gas analyzer in-situ type of the present utility model includes a purge guiding ring 2, a window lens holder 3, a window lens pressing ring 4, and a purge protection gas interface 5. It is characterized in that: the purge guiding ring 2, the window lens holder 3, and the window lens pressing ring 4 are respectively installed inside the window lens sleeve, the purge protection gas interface 5 is installed on the window lens sleeve, and the window lens 6 is located between the window lens holder 3 and the window lens pressing ring 4; and the purge guiding ring 2 is located outside the window lens 6. The purge guiding ring 2 is integrally in a shape of a tubular protrusion in the middle and a flat flange shape on the other side. There is an annular air guiding groove at the connection between the flat flange shape and the tubular protrusion in the middle. The purge protection gas interface 5 is communicated with the annular air guiding groove; the opening of the annular guiding groove of the purge guiding ring 2 faces the window lens 6. There is a space between the annular air guiding groove of the purge guiding ring 2 and the window lens holder 3, forming a protection air flow buffer cavity; there is an air flow gap between the tubular protrusion of the purge guiding ring 2, the window lens holder 3, and the window lens 6, forming a protection air flow purge channel.

[0019] When the present utility model is in use, as Figure 2 shown in the figure, the purge guiding ring 2, the window lens holder 3, the window lens pressing ring 4, and the purge protection gas interface 5 are respectively installed inside the two window lens sleeves of the in-situ type laser gas analyzer laser, and each window lens 6 is located between the corresponding window lens holder 3 and the window lens pressing ring 4; and the corresponding purge guiding ring 2 is located outside the corresponding window lens 6. Each of the purge guiding rings 2 is integrally in a shape of a tubular protrusion in the middle and a flat flange shape on the other side. There is an annular air guiding groove at the connection between the flat flange shape and the tubular protrusion in the middle. Each purge protection gas interface 5 is communicated with an annular air guiding groove; the opening of the annular guiding groove of each purge guiding ring 2 faces the corresponding window lens 6. There is a space between the annular air guiding groove of the purge guiding ring 2 and the window lens holder 3, forming a protection air flow buffer cavity; there is an air flow gap between the tubular protrusion of the purge guiding ring 2, the window lens holder 3, and the window lens 6, forming a protection air flow purge channel.

[0020] The specific working principle is as follows: The purge protection gas (usually high-purity N2) enters the purge guiding ring 2 protection air flow buffer cavity from the connecting pipe through the purge protection gas interface 5, passes through the protection air flow purge channel from the opening of the annular guiding groove of the purge guiding ring 2, and stably and uniformly flows towards the window lens 6. After the air flow reaches the window lens 6 and turns back, the protection air flow flows out reversely from the center of the tubular protrusion pipe of the purge guiding ring 2 and flows out together with the measured gas through the installation connecting pipe.

[0021] The purging air flow of the direct blowing window lens 6 can effectively cool the window lens 6, keep the temperature constant, and perform a purging and cleaning function; the air flow in the outward direction of the center of the tubular convex pipeline of the purging guide ring 2 can block and prevent the pollution and corrosion of the window lens 6 by dust, particles, harmful gases, etc. in the measured gas.

Claims

1. An in-situ laser gas analyzer laser window lens protection structure, comprising a purge guide ring, a window lens holder, a window lens pressure ring, and a purge protection gas interface, characterized in that: The purge guide ring, the window lens holder and the window lens pressure ring are respectively installed in the window lens sleeve, the purge protection gas interface is installed on the window lens sleeve, and the window lens is located between the window lens holder and the window lens pressure ring; and the purge guide ring is located on the outside of the window lens.

2. According to claim 1, the laser window lens protection structure of an in-situ laser gas analyzer is characterized in that: The purge guide ring as a whole is a middle tubular protrusion and the other side is a flat flange shape. There is an annular air guide groove at the connection between the flat flange shape and the middle tubular protrusion, and the purge protection gas interface is connected to the annular air guide groove.

3. According to claim 2, the laser window lens protection structure of an in-situ laser gas analyzer is characterized in that: The annular guide groove of the purge guide ring opens toward the window lens.

4. According to claim 2, the laser window lens protection structure of an in-situ laser gas analyzer is characterized in that: A space is left between the annular air guide groove of the purge guide ring and the window lens holder to form a protective air flow buffer chamber.

5. According to claim 2, the laser window lens protection structure of an in-situ laser gas analyzer is characterized in that: An airflow gap is left between the tubular protrusion of the purge guide ring and the window lens holder and the window lens, forming a protective airflow purge channel.

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