An explosion-proof flame detector

Abstract

This application relates to the technical field of boiler flame detection technology, and particularly relates to an explosion-proof flame detector, which includes a control head, an optical fiber, an optical fiber probe and an explosion-proof mechanism. The optical fiber probe is connected to the control head through the optical fiber. The explosion-proof mechanism includes a first explosion-proof tube and a cooling component. The first explosion-proof tube is sleeved on the optical fiber and is clamped with the control head. A cooling cavity is formed between the first explosion-proof tube and the optical fiber. The cooling component is arranged in the first explosion-proof tube and is located in the cooling cavity. By setting the explosion-proof mechanism in this application, when the flame detector is working, the cooling cavity continuously provides a relatively low temperature environment, thereby reducing the temperature of the optical fiber probe and the optical fiber protection tube, and thus reducing the bursting phenomenon of the flame detector caused by high temperature, enabling the flame detector to normally detect the flame in the furnace and maintaining the detection effect of the flame detector.

Description

Technical Field

[0001] This application relates to the technical field of boiler flame detection technology, and in particular to an explosion-proof flame detector. Background Art

[0002] Currently, a flame detector is an important device in the boiler furnace safety monitoring system. Its function is to detect the combustion condition in real time according to the combustion characteristics of the flame. Once the flame combustion state does not meet the normal conditions or the flame goes out, a signal is given in a certain way to ensure that the fuel supply stops when the boiler extinguishes. It mainly consists of two parts: a probe and a signal processor.

[0003] After retrieval, a Chinese patent with the application number CN201720602823.0 discloses a flame detector, which includes a mounting tube, an optical fiber protection tube, an optical fiber assembly, an optical fiber lens, and a flame detection probe; the mounting tube is sleeved outside the optical fiber protection tube; the front end of the optical fiber assembly is connected to the optical fiber lens, and the rear end of the optical fiber assembly is connected to the flame detection probe; the optical fiber is arranged in the optical fiber protection tube, and the rear end of the optical fiber protection tube is detachably connected to the flame detection probe; the mounting tube is connected to the optical fiber protection tube through a first connection mechanism; a fiber baffle fixed in the mounting tube is arranged at the front end of the optical fiber protection tube; a groove adapted to the optical fiber lens is arranged on the fiber baffle; an observation hole penetrating the fiber baffle is arranged at the bottom of the groove.

[0004] In the process of implementing this application, the inventor found that there are at least the following problems in this technology: due to being exposed to the high temperature in the furnace for a long time, the flame detector will burst, so the flame detector cannot detect the temperature in the furnace normally. Summary of the Invention

[0005] In order to reduce the bursting of the flame detector and maintain the detection effect of flame detection, this application provides an explosion-proof flame detector.

[0006] An explosion-proof flame detector provided by this application adopts the following technical solution:

[0007] An explosion-proof flame detector includes a control head, an optical fiber, an optical fiber probe, and an explosion-proof mechanism. The optical fiber probe is connected to the control head through the optical fiber; the explosion-proof mechanism includes a first explosion-proof tube and a cooling component. The first explosion-proof tube is sleeved on the optical fiber and is clamped to the control head. A cooling cavity is formed between the first explosion-proof tube and the optical fiber, and the cooling component is arranged in the first explosion-proof tube and located in the cooling cavity.

[0008] By adopting the above technical solution, first, the first explosion-proof tube is sleeved on the optical fiber, and the first explosion-proof tube is clamped with the control head, and then the flame detector is installed on the boiler; when the boiler burns, the cooling component is used to cool the cooling cavity, and the cold air in the cooling cavity will exchange heat with the optical fiber probe and the optical fiber; through the explosion-proof mechanism provided, when the flame detector is working, the cooling cavity continuously provides a lower temperature environment, so as to reduce the temperature of the optical fiber probe and the optical fiber protection tube, thereby reducing the bursting phenomenon of the flame detector caused by high temperature, enabling the flame detector to normally detect the flame in the furnace, and maintaining the detection effect of the flame detector.

[0009] Optionally, the cooling component includes a cooling pipe, a water inlet pipe, a water return pipe, a cooling tank and a supply pump, and the water inlet pipe is communicated with the cooling tank through the supply pump; a plurality of the cooling pipes connected to the water inlet pipe are arranged in the cooling cavity, and the cooling pipes are arranged along the length direction of the optical fiber; one end of the water return pipe is arranged on the cooling tank, and the other end of the water return pipe passes through the first explosion-proof tube and is connected to the end of the cooling pipe far away from the water inlet pipe.

[0010] By adopting the above technical solution, when the flame detector is working, the supply pump is started, and the supply pump transports the cooling liquid in the cooling tank to the cooling pipe through the water inlet pipe, and the cooling liquid exchanges heat with the hot air in the cooling cavity through the cooling pipe and returns to the cooling tank through the water return pipe; through the cooling component provided, the heat in the cooling cavity is quickly taken away by means of water cooling, the cooling cavity is cooled, and the temperature of the optical fiber probe and the optical fiber is reduced.

[0011] Optionally, the connecting ends of the cooling pipe and the water inlet pipe are flexible hoses, and the connecting ends of the cooling pipe and the water return pipe are flexible hoses; a pressing mechanism is arranged on the first explosion-proof tube, the pressing mechanism is connected with the control head, and the pressing mechanism is connected with the cooling pipe and drives the cooling pipe to abut against the optical fiber.

[0012] By adopting the above technical solution, after the first explosion-proof tube is sleeved on the optical fiber, a plurality of cooling pipes are pressed tightly against the optical fiber by the pressing mechanism; the optical fiber is relatively soft, and the flexible hose sections and the pressing mechanism provided are convenient for the threading of the optical fiber or the installation of the first explosion-proof tube on the one hand; on the other hand, the plurality of cooling pipes play a certain supporting role for the optical fiber, reducing the rapid heat conduction caused by the direct contact between the optical fiber and the first explosion-proof tube, resulting in the rapid temperature rise and bursting of the optical fiber; on the other hand, the cooling pipe abuts against the optical fiber, so that the temperature of the optical fiber is reduced again, and further reduces the probability of optical fiber bursting; on the other hand, the optical fiber is in a high-temperature bent state for a long time, and affected by the thermal expansion of the spool, the stress on it will increase, which will further reduce the mechanical reliability of the optical fiber and may even cause the optical fiber to break. The support of the cooling pipe for the optical fiber can reduce the occurrence of this situation.

[0013] Optionally, the pressing mechanism includes a pressing rope, a rotating block and a reset assembly. The rotating block is rotatably connected to the first explosion-proof tube. One end of the pressing rope is arranged on the first explosion-proof tube, the other end of the pressing rope is connected to the rotating block, and the pressing rope is located between the cooling tube and the first explosion-proof tube. The reset assembly is arranged on the first explosion-proof tube, and the reset assembly is connected to the cooling tube and drives the cooling tube away from the optical fiber.

[0014] By adopting the above technical solution, after the first explosion-proof tube is sleeved on the optical fiber, the rotating block is rotated. The rotating block drives one end of the pressing rope to rotate. The pressing rope winds around the cooling tube and drives the cooling tube to approach the optical fiber until the cooling tube abuts against the optical fiber. When replacing the optical fiber or the optical fiber probe, the rotating block is rotated in the reverse direction. The rotating block drives the pressing rope to rotate, and the reset assembly drives the cooling tube to slide away from the optical fiber. The pressing mechanism arranged realizes the approach of the cooling tube to the optical fiber, and the arranged pressing mechanism has a simple structure and is convenient to operate.

[0015] Optionally, the reset assembly includes a reset ring, a reset spring and a connecting ring. A plurality of the reset rings slide on the side wall of the first explosion-proof tube, and the plane where the reset rings are located is arranged at an angle to the length direction of the first explosion-proof tube. The reset spring is arranged on the first explosion-proof tube, and the reset spring is connected to the reset ring and drives the reset ring to abut against the inner wall of the first explosion-proof tube. A plurality of the connecting rings are rotatably arranged on each reset ring, and the connecting rings are sleeved on the cooling tube and slide along the cooling tube.

[0016] By adopting the above technical solution, the rotating block is rotated. The rotating block drives the pressing rope to rotate. The pressing rope drives a plurality of cooling tubes to abut tightly against the optical fiber. At the same time, the reset ring inclines and pulls the reset spring to elongate, and the reset spring accumulates elastic potential energy. At the same time, one end of the connecting ring connected to the reset ring rotates relatively, and the connecting ring and the cooling tube slide relatively. When disassembling, the rotating block is rotated in the reverse direction. The rotating block drives the pressing rope to rotate. The reset ring pulls the reset ring to reset, and the reset ring drives the cooling tube connected to the connecting ring away from the optical fiber. The arranged reset assembly has a simple structure and realizes the automatic separation of the cooling tube from the optical fiber, thereby making the removal of the optical fiber and the optical fiber probe convenient and fast.

[0017] Optionally, an atomizing cooling mechanism is provided on the first explosion-proof pipe. The atomizing cooling mechanism includes a second explosion-proof pipe, a first plug, an atomizing nozzle, a reflux assembly, and a connecting assembly. The second explosion-proof pipe is sleeved on the first explosion-proof pipe and connected to the control head through the connecting assembly; the first plug is threadedly connected to the end of the second explosion-proof pipe, and a through hole for the optical fiber probe to pass through is formed in the first plug. An atomizing cooling cavity is formed among the first explosion-proof pipe, the second explosion-proof pipe, and the first plug; the atomizing nozzle is arranged on the outer side wall of the first explosion-proof pipe and is connected to the cooling box; the reflux assembly is arranged on the second explosion-proof pipe, and the reflux assembly discharges the atomized gas in the atomizing cooling cavity.

[0018] By adopting the above technical solution, first, the second explosion-proof pipe is sleeved on the first explosion-proof pipe, then the second explosion-proof pipe is connected to the control head by the connecting assembly, then the first plug is threadedly connected to the second explosion-proof pipe, and then the flame detector is installed on the boiler; when the flame detector is working, the cooling liquid in the cooling box enters the atomizing nozzle, and the atomizing nozzle atomizes the cooling liquid and sprays it into the atomizing cooling cavity. The cooling liquid contacts the hot gas or the second explosion-proof pipe to form mist and drives away the heat, and the reflux assembly discharges the mist; through the arranged atomizing cooling mechanism, the temperature of the outer environment of the first explosion-proof pipe is reduced, and through two-stage cooling, the temperature of the optical fiber and the optical fiber probe is reduced again, thereby reducing the bursting of the optical fiber and the optical fiber probe, and maintaining the flame detection effect of the flame detector.

[0019] Optionally, the reflux assembly includes a partition plate, a first fan, and a second fan. The partition plate is arranged on the inner wall of the second explosion-proof pipe and abuts against the first explosion-proof pipe; the first fan is arranged on the second explosion-proof pipe and communicates with the atomizing cooling cavity, the second fan is arranged on the second explosion-proof pipe and communicates with the atomizing cooling cavity, the first fan and the second fan are respectively located on both sides of the partition plate, and the rotation directions of the first fan and the second fan are opposite.

[0020] By adopting the above technical solutions, first, the second explosion-proof pipe is sleeved on the first explosion-proof pipe, then the second explosion-proof pipe is connected to the control head with a connecting component, then the first plug is threadedly connected to the second explosion-proof pipe, and then the flame detector is installed on the boiler; when the flame detector is working, the cooling liquid in the cooling tank enters the atomizing nozzle, the atomizing nozzle atomizes the cooling liquid and sprays it into the atomizing cooling cavity, the cooling liquid contacts the hot gas or the second explosion-proof pipe to form fog, and drives away the heat, then the first fan is started, the first fan disturbs the fog in the atomizing cooling cavity, so that the fog flows to take away the heat, then the second fan is started, and the second fan drives the fog out of the atomizing cooling cavity; through the arranged reflux component, on the one hand, it makes the cooling fog flow to facilitate the absorption and removal of heat, on the other hand, the second fan discharges the fog, which is convenient for the fog to take away the heat, and at the same time is convenient for the atomizing nozzle to perform the next atomizing cooling on the atomizing cooling cavity.

[0021] Optionally, the connecting component includes a first clamping block, a connecting plate and a connecting bolt. The first clamping block is arranged on the control head, and the second explosion-proof pipe is clamped with the first clamping block; the connecting plate is arranged at one end of the second explosion-proof pipe close to the control head, and the connecting bolt passes through the connecting plate and is threadedly connected to the control head.

[0022] By adopting the above technical solutions, first, the second explosion-proof pipe is sleeved on the first explosion-proof pipe, the second explosion-proof pipe is clamped with the first clamping block, and then the connecting bolt is rotated, and the connecting bolt drives the connecting plate and the second explosion-proof pipe to tightly press against the control head; through the arranged connecting component, the second explosion-proof pipe is detachable, and at the same time, the structure of the connecting component is simple and convenient to operate.

[0023] Optionally, a heat-insulating ceramic ring is arranged on the inner wall of the through-hole of the first plug, and the heat-insulating ceramic ring abuts against the outer side wall of the optical fiber probe.

[0024] By adopting the above technical solutions, through the arranged heat-insulating ceramic ring, on the one hand, it can reduce the heat conduction of the flame heat to the atomizing cooling cavity through the heat-insulating ceramic ring; on the other hand, it reduces the heat conduction between the optical fiber probe and the second explosion-proof pipe.

[0025] Optionally, a butting plate is arranged on the side wall of the first plug, and the butting plate is located in the atomizing cooling cavity and abuts against the first explosion-proof pipe.

[0026] By adopting the above technical solutions, first, the second explosion-proof pipe is sleeved on the first explosion-proof pipe, the second explosion-proof pipe is clamped with the first clamping block, then the connecting bolt is rotated, the connecting bolt drives the connecting plate and the second explosion-proof pipe to tightly press against the control head, and then the first plug is rotated, and the first plug drives the butting plate to approach the first explosion-proof pipe until the butting plate tightly presses against the first explosion-proof pipe; through the arranged butting plate, the stability of the first explosion-proof pipe is increased.

[0027] In summary, the present application includes the following beneficial technical effects:

[0028] 1. By providing an explosion-proof mechanism, when the flame detector is working, the cooling cavity continuously provides a relatively low temperature environment, thereby reducing the temperature of the optical fiber probe and the optical fiber protection tube, and thus reducing the bursting phenomenon of the flame detector caused by high temperature, enabling the flame detector to normally detect the flame in the furnace and maintaining the detection effect of the flame detector;

[0029] 2. By providing an atomizing cooling mechanism, the temperature of the outer environment of the first explosion-proof tube is reduced, and through two-stage cooling, the temperature of the optical fiber and the optical fiber probe is reduced again, thereby reducing the bursting of the optical fiber and the optical fiber probe and maintaining the flame detection effect of the flame detector;

[0030] 3. By providing a reflux assembly, on the one hand, it makes the cooling mist flow to facilitate the absorption and removal of heat, and on the other hand, the second fan discharges the mist, which is convenient for the mist to take away the heat and at the same time convenient for the atomizing nozzle to perform the next atomizing cooling on the atomizing cooling cavity;

[0031] 4. By providing a heat-insulating ceramic ring, on the one hand, it can reduce the heat conduction of the flame heat to the atomizing cooling cavity through the heat-insulating ceramic ring; on the other hand, it reduces the heat conduction between the optical fiber probe and the second explosion-proof tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the explosion-proof flame detector in the embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of a partial structure of the explosion-proof mechanism in the embodiment of the present application;

[0034] Figure 3 It is an explosion schematic diagram of the first explosion-proof tube in the embodiment of the present application;

[0035] Figure 4 It is a schematic diagram of the structure of the pressing mechanism in the embodiment of the present application;

[0036] Figure 5 It is a schematic diagram of the structure of the atomizing cooling mechanism in the embodiment of the present application;

[0037] Figure 6 It is a schematic diagram of the structure of the connection assembly in the embodiment of the present application.

[0038] Reference numerals: 100, control head; 200, optical fiber; 300, optical fiber probe; 400, explosion-proof mechanism; 410, first explosion-proof tube; 411, first cylindrical tube; 412, second cylindrical tube; 413, third cylindrical tube; 420, cooling assembly; 421, cooling tube; 422, water inlet pipe; 423, water return pipe; 424, cooling tank; 425, water inlet ring pipe; 426, water return ring pipe; 430, second plug; 440, second clamping block; 500, pressing mechanism; 510, pressing rope; 520, rotating block; 530, reset assembly; 531, reset ring; 532, reset spring; 533, connecting ring; 600, atomizing cooling mechanism; 610, second explosion-proof tube; 611, semi-circular plate; 612, fixing plate; 613, fixing bolt; 614, fixing nut; 620, first plug; 630, atomizing nozzle; 640, reflux assembly; 641, first fan; 642, second fan; 643, partition board; 650, connecting assembly; 651, connecting plate; 652, connecting bolt; 653, first clamping block; 660, heat-insulating ceramic ring; 670, abutting plate. Detailed implementation manners

[0039] The following will further describe the present application in detail with reference to Figure 1-6 the accompanying drawings.

[0040] An embodiment of the present application discloses an explosion-proof flame detector.

[0041] Referring to Figure 1 and Figure 2 , the explosion-proof flame detector includes a control head 100, an optical fiber 200 disposed on the control head 100 for signal transmission, an optical fiber probe 300 disposed on the optical fiber 200 for flame detection, and an explosion-proof mechanism 400 disposed on the control head 100 for cooling and explosion-proof of the optical fiber 200 and the optical fiber probe; when the flame detector works, the optical fiber probe 300 detects the flame state in the boiler and transmits the signal to the control head 100 through the optical fiber 200. During the detection process, the explosion-proof mechanism 400 cools the optical fiber 200 and the optical fiber probe 300 to reduce the probability of explosion of the optical fiber 200 and the optical fiber probe 300.

[0042] Referring to Figure 1 , Figure 2 and Figure 3, the explosion-proof mechanism 400 includes a first explosion-proof tube 410. The first explosion-proof tube 410 is a cylindrical hollow tube, and the first explosion-proof tube 410 is sleeved on the optical fiber 200. One end of the control head 100 close to the optical fiber probe 300 is fixedly connected with a second clamping block 440. The second clamping block 440 is clamped with the first explosion-proof tube 410. One end of the first explosion-proof tube 410 away from the control head 100 is threadedly connected with a second blind head 430. The second blind head 430, the first explosion-proof tube 410 and the optical fiber 200 form a cooling cavity. A through hole for the optical fiber probe 300 to pass through is opened on the second blind head 430, and the through hole is communicated with the cooling cavity. The side wall of the through hole in contact with the optical fiber probe 300 is made of heat-insulating ceramic material, which can effectively reduce the heat conduction between the first explosion-proof tube 410 and the optical fiber probe 300. A cooling component 420 is arranged in the first explosion-proof tube 410. The cooling component 420 includes a cooling box 424 placed on one side of the control head 100. A supply pump is fixedly connected to the cooling box 424. The water inlet end of the supply pump is communicated with the cooling box 424. The water outlet end of the supply pump is fixedly connected with a water inlet pipe 422. The water inlet pipe 422 passes through the first explosion-proof tube 410 and extends into the cooling cavity. One end of the water inlet pipe 422 extending into the cooling cavity is fixedly connected with a water inlet ring pipe 425. The water inlet ring pipe 425 is sleeved on the outside of the optical fiber 200. A return water ring pipe 426 is also sleeved on the optical fiber 200. The return water ring pipe 426 is located on the side of the water inlet ring pipe 425 away from the second blind head 430. A plurality of cooling pipes 421 are fixedly connected to the water inlet ring pipe 425 through hoses. The cooling pipes 421 are bent and connected with the return water ring pipe 426 through hoses.

[0043] Reference Figure 2 , Figure 3 and Figure 4 , the first explosion-proof tube 410 is composed of three cylindrical tubes, which are respectively the first cylindrical tube 411, the second cylindrical tube 412 and the third cylindrical tube 413 starting from the end close to the control head 100. A pressing mechanism 500 is arranged on the first explosion-proof tube 410. The pressing mechanism 500 includes two rotating blocks 520. One of the rotating blocks 520 is fixedly connected with the second cylindrical tube 412 and rotatably connected with the first cylindrical tube 411. The other rotating block 520 is fixedly connected to the third cylindrical tube 413 and rotatably connected with the second cylindrical tube 412. A pressing rope 510 is fixedly connected to the inner wall of the first cylindrical tube 411. One end of the pressing rope 510 away from the first cylindrical tube 411 is connected with the rotating block 520 fixedly connected to the second cylindrical tube 412. The pressing rope 510 is arranged around a plurality of cooling pipes 421 and is located between the cooling pipes 421 and the first explosion-proof tube 410. When the rotating block 520 is rotated, the pressing rope 510 winds and pulls the cooling pipes 421 to approach the optical fiber 200.

[0044] Reference Figure 2 and Figure 4, a reset component 530 is arranged inside the first explosion-proof tube 410. The reset component 530 includes a reset ring 531 slidably connected to the inner wall of the first explosion-proof tube 410. The reset ring 531 is inclined and the plane where the reset ring 531 is located forms an angle with the length direction of the first explosion-proof tube 410. A plurality of reset springs 532 are arranged on the first explosion-proof tube 410. One reset ring 531 corresponds to two reset springs 532. The two reset springs 532 are respectively located on the side where the included angle between the reset ring 531 and the first explosion-proof tube 410 is acute and are connected to the reset ring 531. The reset springs 532 pull the reset ring 531 to abut against the inner wall of the first explosion-proof tube 410; a plurality of connecting rings 533 are rotatably connected to the reset ring 531. One ends of the plurality of connecting rings 533 away from the reset ring 531 are respectively slidably connected to a plurality of cooling tubes 421.

[0045] Reference Figure 5 and Figure 6 , an atomizing and cooling mechanism 600 is arranged on the control head 100. The atomizing and cooling mechanism 600 includes a second explosion-proof tube 610 sleeved outside the first explosion-proof tube 410. The second explosion-proof tube 610 is composed of two semi-arc plates 611. Fixing plates 612 are integrally arranged on both sides of the semi-arc plate 611. Connecting holes are opened on the fixing plates 612. Fixing bolts 613 are arranged in the connecting holes. The fixing bolts 613 sequentially pass through the fixing plates 612 on the two semi-arc plates 611 and are threadedly connected with fixing nuts 614; a connecting component 650 for connecting the two semi-arc plates 611 is arranged on the control head 100. The connecting component 650 includes a first clamping block 653 fixedly connected to the control head 100. The second explosion-proof tube 610 composed of the two semi-arc plates 611 is clamped with the first clamping block 653; connecting plates 651 are fixedly connected to one ends of the two semi-arc plates 611 close to the control head 100. Connecting bolts 652 are arranged on the connecting plates 651. One end of the connecting bolt 652 passes through the connecting plate 651 and is threadedly connected with the control head 100; a first blind head 620 is threadedly connected to one ends of the two semi-arc plates 611 away from the control head 100. A through hole for facilitating the fiber optic probe 300 to pass through is opened on the first blind head 620. A heat-insulating ceramic ring 660 is fixedly connected to the inner wall of the through hole. The heat-insulating ceramic ring 660 abuts against the outer side wall of the fiber optic probe 300; a butting plate 670 is fixedly connected to the side wall of the first blind head 620 close to the first explosion-proof tube 410. The butting plate 670 abuts against the second blind head 430; atomizing nozzles 630 are fixedly connected to both of the two semi-arc plates 611. The atomizing nozzles 630 extend to the end of the third cylindrical tube 413 away from the first cylindrical tube 411. Atomizing holes are opened on the atomizing nozzles 630; the atomizing nozzles 630 pass through the semi-arc plates 611 and are connected to the cooling tank 424 through a pressure pump.

[0046] Reference Figure 5 and Figure 6, a reflux assembly 640 is provided on the semi-arc plate 611. The reflux assembly 640 includes a partition plate 643 fixedly connected to one of the semi-arc plates 611. One end of the partition plate 643 away from the semi-arc plate 611 abuts against the first explosion-proof pipe 410. The first explosion-proof pipe 410, the second explosion-proof pipe 610 and the first plug 620 form an atomization cooling chamber. Air holes communicating with the atomization cooling chamber are provided on both semi-arc plates 611. The two air holes are respectively located on both sides of the partition plate 643. A first fan 641 is fixedly connected to the semi-arc plate 611. The first fan 641 communicates with the atomization cooling chamber through one of the air holes. The second fan 642 communicates with the atomization cooling chamber through the other air hole. The rotation directions of the first fan 641 and the second fan 642 are always opposite. Turning on the first fan 641 can disturb the atomized gas in the atomization cooling chamber, and turning on the second fan 642 can discharge the atomized gas in the atomization cooling chamber.

[0047] The implementation principle of an explosion-proof flame detector according to an embodiment of the present application is as follows: First, the first explosion-proof pipe 410 is sleeved on the optical fiber 200, and the first explosion-proof pipe 410 is clamped with the control head 100. Rotate the rotating block 520, and one end of the pressing rope 510 driven by the rotating block 520 rotates. The pressing rope 510 winds around the cooling pipe 421 and drives the cooling pipe 421 to approach the optical fiber 200 until the cooling pipe 421 abuts against the optical fiber 200. At the same time, the reset ring 531 inclines and pulls the reset spring 532 to elongate, and the reset spring 532 accumulates elastic potential energy. At the same time, one end of the connecting ring 533 connected to the reset ring 531 rotates relatively, and the connecting ring 533 and the cooling pipe 421 slip relatively. Then, the two semi-arc plates 611 are sleeved on the first explosion-proof pipe 410, and then the two semi-arc plates 611 are fastened by fixing bolts 613 and nuts. The second explosion-proof pipe 610 is clamped with the first clamping block 653. Then, rotate the connecting bolt 652, and the connecting bolt 652 drives the connecting plate 651 and the second explosion-proof pipe 610 to abut tightly against the control head 100. Then, move the first plug 620 closer to the second explosion-proof pipe 610. The optical fiber probe 300 passes through the first plug 620, and then rotate the first plug 620 to be threadedly connected to the second explosion-proof pipe 610. Then, install the flame detector on the boiler.

[0048] When the flame detector works, start the supply pump. The supply pump transports the cooling liquid in the cooling tank 424 to the inside of the cooling pipe 421 through the water inlet pipe 422. The cooling liquid exchanges heat with the hot gas in the cooling cavity through the cooling pipe 421 and returns to the cooling tank 424 through the water return pipe 423. The cooling liquid in the cooling tank 424 enters the atomizing nozzle 630 through the pressure pump. The atomizing nozzle 630 atomizes the cooling liquid and sprays it in the atomizing cooling cavity. The cooling liquid contacts the hot gas or the second explosion-proof pipe 610 to form mist and absorbs heat. Then start the first fan 641. The first fan 641 disturbs the mist in the atomizing cooling cavity, so that the mist flows to take away heat. Then start the second fan 642. The second fan 642 drives the mist to discharge from the atomizing cooling cavity. Repeat the spraying and atomized gas discharge for multiple times to cool the optical fiber 200 and the optical fiber probe 300 for the second time.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An explosion-proof flame detector, characterized in that, it includes a control head (100), an optical fiber (200), an optical fiber probe (300) and an explosion-proof mechanism (400). The optical fiber probe (300) is connected to the control head (100) through the optical fiber (200). The explosion-proof mechanism (400) includes a first explosion-proof tube (410) and a cooling assembly (420). The first explosion-proof tube (410) is sleeved on the optical fiber (200) and is snap-connected to the control head (100). A cooling cavity is formed between the first explosion-proof tube (410) and the optical fiber (200). The cooling assembly (420) is arranged in the first explosion-proof tube (410) and is located in the cooling cavity; The cooling assembly (420) includes a cooling tube (421), a water inlet pipe (422), a water return pipe (423), a cooling tank (424) and a supply pump. The water inlet pipe (422) is communicated with the cooling tank (424) through the supply pump. A plurality of the cooling tubes (421) connected to the water inlet pipe (422) are arranged in the cooling cavity. The cooling tubes (421) are arranged along the length direction of the optical fiber (200). One end of the water return pipe (423) is arranged on the cooling tank (424). The other end of the water return pipe (423) passes through the first explosion-proof tube (410) and is connected to the end of the cooling tube (421) far away from the water inlet pipe (422); The connection end of the cooling tube (421) and the water inlet pipe (422) is a flexible hose. The connection end of the cooling tube (421) and the water return pipe (423) is a flexible hose. A pressing mechanism (500) is arranged on the first explosion-proof tube (410). The pressing mechanism (500) is connected to the control head (100). The pressing mechanism (500) is connected to the cooling tube (421) and drives the cooling tube (421) to abut against the optical fiber (200); The pressing mechanism (500) includes a pressing rope (510), a rotating block (520) and a reset assembly (530). The rotating block (520) is rotatably connected to the first explosion-proof tube (410). One end of the pressing rope (510) is arranged on the first explosion-proof tube (410). The other end of the pressing rope (510) is connected to the rotating block (520), and the pressing rope (510) is located between the cooling tube (421) and the first explosion-proof tube (410). The reset assembly (530) is arranged on the first explosion-proof tube (410). The reset assembly (530) is connected to the cooling tube (421) and drives the cooling tube (421) to be away from the optical fiber (200).

2. The explosion-proof flame detector according to claim 1, characterized in that, The reset assembly (530) includes a reset ring (531), a reset spring (532) and a connecting ring (533). A plurality of the reset rings (531) are slidably arranged on the side wall of the first explosion-proof tube (410), and the plane where the reset ring (531) is located is arranged at an angle with the length direction of the first explosion-proof tube (410); the reset spring (532) is arranged on the first explosion-proof tube (410), the reset spring (532) is connected to the reset ring (531) and drives the reset ring (531) to abut against the inner wall of the first explosion-proof tube (410); a plurality of the connecting rings (533) are rotatably arranged on each reset ring (531), and the connecting ring (533) is sleeved on the cooling tube (421) and slides along the cooling tube (421).

3. An explosion-proof flame detector according to claim 1, characterized in that, an atomizing and cooling mechanism (600) is arranged on the first explosion-proof tube (410), and the atomizing and cooling mechanism (600) includes a second explosion-proof tube (610), a first plug (620), an atomizing nozzle (630), a reflux assembly (640) and a connecting assembly (650). The second explosion-proof tube (610) is sleeved on the first explosion-proof tube (410) and is connected to the control head (100) through the connecting assembly (650); the first plug (620) is threadedly connected to the end of the second explosion-proof tube (610), and a through hole for the optical fiber probe (300) to pass through is formed in the first plug (620). An atomizing and cooling cavity is formed among the first explosion-proof tube (410), the second explosion-proof tube (610) and the first plug (620); the atomizing nozzle (630) is arranged on the outer side wall of the first explosion-proof tube (410), and the atomizing nozzle (630) is connected to the cooling box (424); the reflux assembly (640) is arranged on the second explosion-proof tube (610), and the reflux assembly (640) discharges the atomized gas in the atomizing and cooling cavity.

4. An explosion-proof flame detector according to claim 3, characterized in that, the reflux assembly (640) includes a partition plate (643), a first fan (641) and a second fan (642). The partition plate (643) is arranged on the inner wall of the second explosion-proof tube (610), and the partition plate (643) abuts against the first explosion-proof tube (410); the first fan (641) is arranged on the second explosion-proof tube (610) and is communicated with the atomizing and cooling cavity, the second fan (642) is arranged on the second explosion-proof tube (610) and is communicated with the atomizing and cooling cavity. The first fan (641) and the second fan (642) are respectively located on both sides of the partition plate (643), and the rotation directions of the first fan (641) and the second fan (642) are opposite.

5. An explosion-proof flame detector according to claim 3, characterized in that, The connecting component (650) includes a first clamping block (653), a connecting plate (651) and a connecting bolt (652). The first clamping block (653) is arranged on the control head (100), and the second explosion-proof tube (610) is clamped with the first clamping block (653); the connecting plate (651) is arranged at one end of the second explosion-proof tube (610) close to the control head (100), and the connecting bolt (652) passes through the connecting plate (651) and is threadedly connected with the control head (100).

6. An explosion-proof flame detector according to claim 3, characterized in that a heat-insulating ceramic ring (660) is arranged on the inner wall of the through-hole of the first blind head (620), and the heat-insulating ceramic ring (660) abuts against the outer side wall of the optical fiber probe (300).

7. An explosion-proof flame detector according to claim 3, characterized in that a contact plate (670) is arranged on the side wall of the first blind head (620), and the contact plate (670) is located in the atomizing cooling cavity and abuts against the first explosion-proof tube (410).

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