CN206682976U - The probing shell cooling device of flame detector - Google Patents

Abstract

The utility model relates to a cooling device for a probe casing of a flame detector. The structure of the utility model is that a convex lens is arranged and fixed in a circular tube, and a photomultiplier tube is also arranged in the circular tube, and the side of the square tube is connected with the cold surface of the semiconductor refrigeration sheet, and a layer of heat-conducting silicone grease is applied on the cold surface of the semiconductor refrigeration sheet , connect the cooling fin on the hot surface of the semiconductive cooling sheet, apply a layer of thermal conductive silicon grease on the hot surface of the semiconductor cooling sheet, and connect the fan to the other side of the cooling sheet. The utility model overcomes the defects of using cooling plates or water-cooling jackets for cooling in the past. The utility model adopts the semi-conductor refrigerating sheet to cool the shell, does not need cooling liquid, adopts the method of air cooling and heat dissipation, does not need any refrigerant, can work continuously, has no pollution source, does not produce gyration effect, and has low vibration and noise during operation , long life, easy installation.

Description

Probe Housing Cooling for Flame Detectors

technical field

The utility model relates to a casing cooling device, in particular to a probe casing cooling device of a flame detector.

Background technique

Flame detectors are generally used to detect the extinguishment of the furnace fire. If the furnace fire is extinguished, toxic carbon monoxide gas will be produced, causing serious consequences. Therefore, it is very important to detect the state of the furnace fire, and the temperature of the furnace fire is high, and the flame If the detector is not cooled during detection, the sensitivity of the photomultiplier tube probe itself will drop rapidly with the increase of the temperature of the photomultiplier tube itself, and it will be easily damaged. Therefore, the cooling of the flame detector is very important.

Before the invention of the utility model, the current cooling method of the flame detector is to use a cooling plate or a water cooling jacket to cool the flame detector, and it needs to be used together with the cooling liquid, which occupies a relatively large space, and the cooling device produced is just Large and bulky, inconvenient to use, and expensive.

Utility model content

The purpose of this utility model is just to overcome above-mentioned defect, develops the probe casing cooling device of flame detector.

The technical scheme of the utility model is:

The probe casing cooling device of the flame detector, the convex lens is arranged and fixed in the circular tube, and the photomultiplier tube is also arranged in the circular tube. A layer of heat-conducting silicon grease is applied on the surface, and a heat sink is connected to the hot surface of the semiconductor cooling sheet. A layer of heat-conducting silicon grease is applied on the heating surface of the semiconductor cooling sheet, and the other side of the heat sink is connected to a fan.

The cold surface of the semiconducting cooling sheet is pasted on the side of the square tube.

The thermal surface of the semiconductor refrigeration sheet is pasted with one side of the heat sink.

The circular tube is divided into a large circular tube and a small circular tube, the lower end of the large circular tube is threadedly connected to the small circular tube, the convex lens is set and fixed in the large circular tube, and the photomultiplier tube is set and fixed in the small circular tube.

The utility model has the advantages and effects of adopting the method of air cooling and heat dissipation, and the heat dissipation of the hot surface of the refrigerating plate can adopt air cooling and heat dissipation, that is, rib-shaped copper or aluminum heat sinks are used, and axial flow fans or centrifugal fans are used to dissipate heat. The heat from the hot surface is taken away without any refrigerant, it can work continuously, there is no pollution source, no gyration effect, low vibration and noise during operation, long life, easy installation, and the temperature difference range between the two sides of the cooling plate is from 40 °C to 65°C can be achieved. Use semiconductor cooling sheet to cool the shell, no coolant is needed, first apply a thin layer of thermal conductive silicone grease to the hot surface of the semiconductor cooling sheet, then press it on the heat sink, and then apply a layer of thermal conductive silicone grease to the cold surface, Paste the cold surface coated with a layer of heat-conducting silicone grease on the shell of the device, and the hot surface on the heat sink. The heat sink and the fan are connected by four screws. The fan is fixed on the device with two bolts, and the semiconductor cooling chip passes through The fan and the casing device are fastened and fixed by bolts. When the flame detector detects the furnace fire, the furnace temperature is high, and the temperature of the entire flame detector device will gradually increase, especially when the temperature of the photomultiplier tube probe rises, its sensitivity will drop rapidly and it will be easily damaged, so it cannot work normally. Detecting the extinguishment of a furnace fire can have dire consequences of unknowingly escaping the toxic gas of carbon monoxide. Therefore, the cooling device of the present utility model cools down the flame detector, especially the photomultiplier tube, when the flame detector detects a furnace fire, so as to avoid the dire consequences that the flame detector cannot work normally due to excessive temperature.

Description of drawings

Fig. 1——Schematic diagram of the appearance and shape of the utility model.

Each label in the figure indicates the corresponding component name as follows:

Convex lens 1, large round tube 2, small round tube 3, photomultiplier tube 4, square tube 5, semiconductor cooling sheet 6, cold surface 7, hot surface 8, heat sink 9, fan 10, plug 11, connecting wire 12, metal gasket 13. Wiring 14.

detailed description

The technical idea of the present utility model is:

The utility model uses the refrigeration effect of the semiconductor refrigeration sheet to cool and protect the flame detector. In the process of using the refrigeration sheet, the most important thing is to dissipate the heat of the hot surface to the outside in time, so as to ensure a good refrigeration effect. Heat dissipation is the transfer of heat, and there are three ways of heat transfer: conduction, radiation, and convection. Conduction is a way of transferring energy by direct contact and collision between particles with lower energy and particles with higher energy; radiation is the heat energy radiated directly from the heat source to the outside world, and this process is related to the color, material and temperature of the surface of the heat source; convection refers to the gas Or the hotter or cooler part of the liquid is circulated to even out the temperature.

The utility model is described in detail below.

As shown in Figure 1:

A convex lens 1 is arranged in the large round tube 2, and a metal gasket 13 is placed on the top and bottom of the convex lens 1. The convex lens 1 is between the two metal gaskets. The convex lens 1 is fixed by the screw connection of the large round tube 2 and the small round tube 3; The multiplier tube 4 is in the small round tube 3, and the bottom of the small round tube 3 communicates with the square tube 5, and the connecting wire 12 connected to the photomultiplier tube 4 is drawn from the lower end of the square tube 5, and is connected (pasted) with a semiconductor refrigeration chip on one side of the square tube 5 The cold surface 7 of the cold surface 7 is coated with a layer of heat-conducting silicone grease, and the hot surface 8 of the semiconductor refrigeration chip is connected to one side of the heat sink 9, and the hot surface 8 is coated with a layer of heat-conducting silicon grease, and the other side of the heat sink 9 is connected to Fan 10, the fan 10 is fixed on the square tube 5 of the device with two bolts, the small round tube 3 and the square tube 5 are strongly connected by special sealant, the plug 11 is drawn out on the fan 10, and the wiring 14 is drawn out from the semiconductor cooling plate 6.

Brief description of the application process of the present utility model:

The phenomenon that the temperature of the whole device will gradually increase will inevitably occur when the flame detector detects the fire, and the utility model will play a considerable role at this time. Each component is energized, and one side of the semiconductor refrigeration sheet 6 is cold, that is, the cold surface 7, and one side is hot, that is, the hot surface 8. The cold surface 7 of the semiconductor refrigeration sheet 6 is used for cooling, and to achieve the cooling effect of the cold surface 7, it is necessary to Ensure that the heat dissipation effect of the hot surface 8 is better. Use the fan 10 to continuously generate strong wind to bring the cold wind from the outside, increase the contact area with the hot surface 8 through the heat sink 9, and take away the heat on the hot surface 8, so as to reach the thermal surface of the semiconductor refrigeration sheet 6 8 for the purpose of heat dissipation, so the cold surface 7 of the semiconductor refrigeration sheet 6 will continue to play a cooling effect. The cold surface 7 and the hot surface 8 of the semiconductor refrigeration sheet 6 can achieve a maximum temperature difference of 65 ° C, and its good cooling effect can be Effectively protect the use of flame detectors.

Therefore, the cooling device of the present utility model cools down the flame detector, especially the photomultiplier tube, when the flame detector detects the furnace fire, so as to prevent the flame detector from being unable to work normally due to excessive temperature, and to avoid the flame detector from being burned out. The undetected extinguishment of the fire could have dire consequences for the unknowing escape of the toxic gas carbon monoxide.

Claims (4)

1. The probe shell cooling device of the flame detector, the convex lens is arranged and fixed in the circular tube, and the photomultiplier tube is also arranged in the circular tube, which is characterized in that the cold surface of the semiconductor refrigeration sheet is connected on the side of the square tube, and the cooling surface of the semiconductor refrigeration sheet A layer of heat-conducting silicone grease is applied on the surface, and a heat sink is connected to the hot surface of the semiconductor cooling sheet. A layer of heat-conducting silicon grease is applied on the hot surface of the semiconductor cooling sheet, and the other side of the heat sink is connected to a fan; The pipe is divided into a large round pipe and a small round pipe, the lower end of the large round pipe is threadedly connected with the small round pipe, and the lower part of the small round pipe is connected with the square pipe. 2. The probe casing cooling device of the flame detector according to claim 1, characterized in that the side surface of the square tube is pasted with a cold surface of a semiconductor refrigeration sheet. 3. The probe housing cooling device of the flame detector according to claim 1, characterized in that the thermal surface of the semiconductor refrigerating sheet is pasted with one side of the heat sink. 4. The cooling device for the probe casing of the flame detector according to claim 1, characterized in that the convex lens is arranged and fixed in the large circular tube, and the photomultiplier tube is arranged and fixed in the small circular tube.