Mounting structure of laser smoke detector

Abstract

The utility model discloses a mounting structure of a laser smoke detector, which comprises a connecting pipe, the connecting pipe penetrates through the side wall of a chimney and extends into the chimney, the head end of the connecting pipe is connected with a laser through a first flange plate and is provided with a laser entrance, and the connecting pipe close to the head end is fixedly connected with the side wall of the chimney through a second flange plate. The tail end of the connecting pipe is a laser emission port, and the inner diameter of the connecting pipe is gradually increased from the laser emission port to the laser emission port. The inner wall of the chimney is lengthened, the influence of backwater on the inner wall of the chimney on equipment is reduced, and the inner wall of the connecting pipe is transformed to be inclined, so that water sliding down along the inner wall of the chimney can be naturally discharged along an inclined plane and cannot flow into a laser device to cause wrong measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke detection of boiler chimneys in thermal power plants, in particular to an installation structure of a laser smoke detector. Background Art

[0002] The laser detector used in the existing thermal power plant vertical chimney uses a semiconductor laser as a light source. After the detection laser beam passes through the spectroscope, the reflected light is detected by the reference detector to form a reference signal; the transmitted light passes through the measured environment containing smoke and dust, and is irradiated on the special reflective material of the reflection module. After the reflected light beam passes through the measured environment again, it is detected by the detection detector to form a measurement signal (the working principle diagram is shown in the figure). Figure 1 As the flue gas in a vertical chimney rises in height, its temperature drops, and it condenses into liquid, which drips down the chimney wall mixed with dust. This can easily drip into the laser system of the equipment, causing the system to misjudge, causing the smoke dust content to exceed the standard for a long time, and affecting manual judgment. Utility Model Content

[0003] The purpose of the utility model is to provide an installation structure for a laser smoke detector to solve the problem that condensate dripping from the inner wall of the boiler chimney of a thermal power plant easily enters the laser system and causes system misjudgment.

[0004] The technical solution adopted by the utility model is a mounting structure of a laser smoke detector, comprising a connecting pipe, the connecting pipe penetrating the side wall of the chimney and extending into the chimney, the length of the connecting pipe being L, the head end of the connecting pipe being connected to the laser through a first flange and the head end being provided with a laser injection port, the connecting pipe being fixedly connected to the side wall of the chimney through a second flange near the head end, the end of the connecting pipe being a laser injection port, and the inner diameter of the connecting pipe gradually increasing from the laser injection port to the laser injection port.

[0005] Preferably, the length L of the connecting pipe extending into the chimney is greater than 1 / 3 of the inner diameter of the chimney at that position.

[0006] Preferably, the diameter of the laser injection port is 0.8-0.9 times the diameter of the laser injection port.

[0007] Preferably, a backflush interface is provided on the wall of the connecting pipe along the length direction, one end of the backflush interface passes through the head end of the connecting pipe, and the other end passes through the inner wall of the connecting pipe and is connected to the interior of the connecting pipe.

[0008] Compared with the existing technology, the beneficial effects of the present invention are: the connecting pipe for installing the laser is penetrated a certain distance into the inner wall of the chimney, the length of the penetration into the inner wall of the chimney is lengthened, the influence of the backwater of the inner wall of the chimney on the equipment is reduced, and the inner wall of the connecting pipe is modified to make the inner wall of the connecting pipe inclined, so that the water sliding down the inner wall of the chimney can be naturally discharged along the inclined surface and will not flow into the laser device to cause erroneous measurements. In addition, a back-blowing interface is provided on the wall of the connecting pipe, and air is blown from the outside to the inside, which is conducive to removing condensed water in the pipe and preventing it from affecting the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the principle diagram of smoke dust detection for the vertical chimney of an existing thermal power plant;

[0010] Figure 2 This is a schematic diagram of the structure of the utility model;

[0011] Figure 3 It is a side view of the utility model. DETAILED DESCRIPTION

[0012] The present invention will be further explained below with reference to the accompanying drawings to facilitate better understanding by those skilled in the art.

[0013] like Figure 2-3 The figure shows a mounting structure for a laser smoke detector, comprising a connecting pipe 1 extending through a chimney sidewall 2 and into the chimney. The connecting pipe 1 has a length L, and the tip of the connecting pipe 1 is connected to the laser via a first flange 3 and is provided with a laser inlet 4. Near the tip of the connecting pipe 1, the connecting pipe 1 is fixedly connected to the chimney sidewall 2 via a second flange 5. The distal end of the connecting pipe 1 is a laser outlet 6, and the inner diameter of the connecting pipe 1 gradually increases from the laser outlet 4 to the laser outlet 6. The length L of the connecting pipe 1 extending into the chimney is greater than one-third of the chimney's inner diameter at that point, extending the length deep into the chimney wall to reduce the impact of backflow on the equipment. The diameter of the laser inlet 4 is 0.8-0.9 times the diameter of the laser outlet 6, creating a slope difference between the front and back, allowing water flowing in from the chimney wall to be discharged.

[0014] Furthermore, a back-blowing interface 7 is provided on the wall of the connecting pipe 1 along the length direction. One end of the back-blowing interface 7 passes through the head end of the connecting pipe 1, and the other end passes through the inner wall of the connecting pipe 1, and is connected with the inside of the connecting pipe 1 to realize blowing from the outside to the inside, which is beneficial to remove condensed water or mist in the connecting pipe 1 to prevent it from affecting the measurement.

[0015] The above-described embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and improvements made by those skilled in the art to the technical solution of the present invention without departing from the spirit and principles of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A mounting structure for a laser smoke detector, characterized in that: The invention comprises a connecting pipe (1), the connecting pipe (1) passes through the chimney side wall (2) and extends into the chimney, the head end of the connecting pipe (1) is connected to the laser through a first flange (3) and the head end is provided with a laser injection port (4), the connecting pipe (1) is fixedly connected to the chimney side wall (2) through a second flange (5) near the head end, the end of the connecting pipe (1) is a laser injection port (6), and the inner diameter of the connecting pipe (1) gradually increases from the laser injection port (4) to the laser injection port (6).

2. The installation structure of a laser smoke detector according to claim 1, characterized in that: The length L of the connecting pipe (1) extending into the chimney is greater than 1 / 3 of the inner diameter of the chimney at that position.

3. The installation structure of a laser smoke detector according to claim 1, characterized in that: The diameter of the laser injection port (4) is 0.8-0.9 times that of the laser injection port (6).

4. The installation structure of a laser smoke detector according to claim 1, characterized in that: A backflush interface (7) is provided on the wall of the connecting pipe (1) along the length direction. One end of the backflush interface (7) passes through the head end of the connecting pipe (1), and the other end passes through the inner wall of the connecting pipe (1) and is in communication with the interior of the connecting pipe (1).

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