Safety interlocking device for preparing p-chloro-o-nitroaniline through continuous amination

Abstract

The safety interlocking device comprises a kettle body, a hollow supporting shaft is arranged in the kettle body, a plurality of stirring blades are fixed to the outer wall of the hollow supporting shaft at equal intervals, a first condensation pipe is arranged on the inner wall of the hollow supporting shaft in an attached mode, and a second condensation pipe is arranged on the inner wall of the first condensation pipe. A first condensation pipe is arranged in the kettle body, a condensation pipe joint is arranged at one end of the first condensation pipe, an interlayer is arranged on the inner wall of the kettle body, a third condensation pipe is laid in the interlayer, a cooling mechanism and a gas storage mechanism are arranged on one side of the kettle body at the same time, the cooling mechanism is connected with the gas storage mechanism, and an opening and closing mechanism is arranged on the inner wall of the kettle body; the safety interlocking device comprises a kettle body, a cooling mechanism is arranged in the kettle body, the cooling mechanism comprises a plurality of liquid passing pipes, a plurality of liquid passing openings are formed in the inner wall of one side of the kettle body, and the liquid passing openings are connected with the two ends of the liquid passing pipes respectively. The effect of explosion in the reaction can be effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of amination preparation, in particular to a safety interlocking device for continuous amination preparation of p-chloro-o-nitroaniline. Background Art

[0002] p-Chloro-o-nitroaniline is an orange-red crystalline powder with a melting point of 116-117°C. It is insoluble in water, soluble in ethanol, ether, and acetic acid, and slightly soluble in crude gasoline. It is obtained from 2,5-dichloronitrobenzene and liquid ammonia through pressurized ammonolysis, crystallization, filtration, and drying. Raw material consumption is: 1167 kg / t 2,5-dichloronitrobenzene (industrial product), 230 kg / t liquid ammonia (industrial product), and 2420 kg / t ammonia water (industrial product). The continuous amination preparation of p-chloro-o-nitroaniline requires a reaction apparatus.

[0003] During the amination reaction of p-chloro-o-nitroaniline, the explosion limit increases with increasing temperature and pressure. Therefore, under certain temperatures, pressures, and catalysts, the oxidation reaction of ammonia releases significant heat. If the ammonia-air ratio becomes imbalanced, an explosion can occur. Conventional equipment monitors temperature and pressure to prevent explosions, but monitoring over time alone does not provide an effective defense against explosions. Summary of the Invention

[0004] The invention discloses a safety interlock device for preparing p-chloro-o-nitroaniline by continuous amination, aiming to solve the technical problem that common equipment prevents explosion by monitoring temperature and pressure, but cannot provide effective prevention measures for explosion if the monitoring time is too long.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A safety interlock device for preparing p-chloro-o-nitroaniline by continuous amination, comprising a kettle body, a hollow support shaft provided in the kettle body, a plurality of stirring blades fixed equidistantly on the outer wall of the hollow support shaft, a first condenser tube fitted on the inner wall of the hollow support shaft, a condenser tube joint provided on one end of the first condenser tube, an interlayer provided on the inner wall of the kettle body, and a third condenser tube laid in the interlayer, a cooling mechanism and a gas storage mechanism provided on one side of the kettle body, the cooling mechanism and the gas storage mechanism being connected, an opening and closing mechanism provided on the inner wall of the kettle body; the cooling mechanism comprises a plurality of liquid passages, a plurality of liquid passage ports are provided on the inner wall of one side of the kettle body, and a plurality of liquid passage ports are provided on the inner wall of the kettle body. The liquid port is respectively connected to both ends of a plurality of liquid pipes, the outer wall of each of the liquid pipes is respectively wrapped with a second condenser, and the same end of each liquid pipe is respectively provided with an oblique liquid outlet, and there is a bending section at the connection between the oblique liquid outlet and the liquid pipe, and the inner wall of the bending section of each liquid pipe is simultaneously connected with a multi-way connecting pipe, one end of the multi-way connecting pipe is connected to the gas storage mechanism through the first ventilation pipe, the middle section of the first ventilation pipe is provided with a negative pressure pump, and the outer sides of the plurality of liquid pipes are simultaneously covered with an outer cover, a bearing seat is provided on the inner wall of the bottom end of the kettle body, one end of the hollow support shaft is provided in the bearing seat and passes through the bearing seat, and a feed port is provided on the inner wall of the top end of the kettle body.

[0007] By providing a cooling mechanism and a first condenser and a third condenser, wherein the third condenser is provided in the interlayer of the kettle body, the third condenser and the first condenser are in contact with the compound in the kettle body through the outer wall of the kettle body and the center of the kettle body respectively, so as to realize the cooling demand of daily operation. In addition, the opening and closing state of the kettle body and the cooling mechanism are controlled by the opening and closing mechanism, and an interlocking structure designed for equipment safety and personal safety can be formed with the monitoring mechanism on the kettle body. Under the action of the cooling mechanism, the gas in the kettle body can be absorbed while the flow space in the liquid pipe is reduced to improve the cooling efficiency of the liquid in the liquid pipe. When the liquid that has been rapidly cooled enters the kettle body, the temperature balance can be achieved by continuous stirring. Under this structure, the occurrence of explosions in the reaction can be effectively avoided by simultaneously performing rapid cooling and vacuuming.

[0008] In a preferred solution, the opening and closing mechanism includes an arc-shaped limiting track, which is fitted on the inner wall of the kettle body, and a U-shaped closing plate is movably connected in the arc-shaped limiting track, and a second magnetic block is fixedly connected to an outer wall of one side of the U-shaped closing plate, and the U-shaped closing plate is fitted on multiple liquid ports, and an arc-shaped driving track is fixedly connected to the outer wall of one side of the kettle body, and an electric slider is movably connected in the arc-shaped driving track, and a strong magnetic block is fixedly connected to the bottom end of the electric slider, and the strong magnetic block is adsorbed on the second magnetic block in the air.

[0009] By providing an opening and closing mechanism for switching the opening and closing states of multiple liquid inlet / outlet ports, and a structure for driving the U-shaped sealing plate to move remotely, it is possible to simultaneously control multiple liquid inlet / outlet ports while ensuring the airtightness of the kettle body.

[0010] In a preferred embodiment, the gas storage mechanism includes a first gas storage chamber and a second gas storage chamber. The first gas storage chamber is connected to a first gas pipe. A fourth gas pipe is tightly connected to an inner wall on one side of the first gas storage chamber. One end of the fourth gas pipe is inserted into the kettle body, and a second metering pump is provided in the middle section of the fourth gas pipe. A second gas pipe is connected between the first gas storage chamber and the second gas storage chamber, and a clamping groove is provided in the middle section of the second gas pipe. A clamping bracket is clamped in the clamping groove, and an ammonia-nitrogen separation membrane is clamped in the clamping bracket. A third gas pipe is fixedly connected to an inner wall on one side of the second gas storage chamber. One end of the third gas pipe is inserted into the kettle body, and a first metering pump is provided in the middle section.

[0011] By providing a gas storage mechanism, the gas storage mechanism can temporarily store the gas extracted by the cooling mechanism. After the gas in the kettle body, including ammonia and air, enters the first gas storage chamber under the action of a negative pressure pump, the ammonia in the mixed gas can be separated into the second gas storage chamber by the barrier of the ammonia-nitrogen separation membrane. Thus, when the gas is completely extracted and the explosion of the kettle body is prevented, it is also convenient to control the secondary reflux of the gas to facilitate continuous reaction.

[0012] As described above, a safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination includes a kettle body. A hollow support shaft is provided inside the kettle body. A plurality of stirring blades are equidistantly fixed on the outer wall of the hollow support shaft. A first condenser is fitted on the inner wall of the hollow support shaft. One end of the first condenser is provided with a condenser joint. A sandwich layer is provided on the inner wall of the kettle body, and a third condenser is laid in the sandwich layer. A cooling mechanism and a gas storage mechanism are simultaneously provided on one side of the kettle body, and the cooling mechanism and the gas storage mechanism are connected. An opening and closing mechanism is provided on the inner wall of the kettle body; the cooling mechanism includes a plurality of liquid pipes. A plurality of liquid inlet / outlet ports are provided on an inner wall on one side of the kettle body, and the plurality of liquid inlet / outlet ports are respectively connected to both ends of the plurality of liquid pipes. A second condenser is wound around the outer wall of each liquid pipe, and an inclined liquid outlet is provided at the same end of each liquid pipe. There is a bent section at the connection between the inclined liquid outlet and the liquid pipe, and a multi-way connecting pipe is connected to the inner wall of the bent section of each liquid pipe at the same time. One end of the multi-way connecting pipe is connected to the gas storage mechanism through a first gas pipe, and a negative pressure pump is provided in the middle section of the first gas pipe. An outer cover covers the outside of the plurality of liquid pipes. The safety interlock device for continuously preparing p-chloro-o-nitroaniline provided by the present invention has the technical effect of effectively avoiding the occurrence of explosion during the reaction by simultaneously performing rapid cooling and air extraction and pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of a safety interlock device for continuously aminating p-chloro-o-nitroaniline proposed by the present invention.

[0014] Figure 2 This is a schematic diagram of the internal structure of a safety interlock device for continuously aminating p-chloro-o-nitroaniline proposed by the present invention.

[0015] Figure 3 This is a schematic diagram of the cooling mechanism and gas storage mechanism of a safety interlock device for continuously aminating p-chloro-o-nitroaniline proposed by the present invention.

[0016] Figure 4 This is a schematic diagram of the internal structure of the hollow support shaft of a safety interlock device for continuously aminating p-chloro-o-nitroaniline proposed by the present invention.

[0017] Figure 5 This is a split structure schematic diagram of the opening and closing mechanism of a safety interlock device for continuously aminating p-chloro-o-nitroaniline proposed by the present invention.

[0018] In the figure: 1, kettle body; 2, feed inlet; 3, condenser joint; 4, cooling mechanism; 5, gas storage mechanism; 6, opening and closing mechanism; 7, hollow support shaft; 8, stirring blade; 9, bearing seat; 10, first condenser; 401, outer cover; 402, liquid delivery pipe; 403, second condenser; 404, inclined liquid outlet; 405, multi-way connecting pipe; 406, negative pressure pump; 407, first ventilation pipe; 501, first gas storage bin; 502, card slot; 503, ammonia-nitrogen separation membrane; 504, clamping frame; 505, second ventilation pipe; 506, second gas storage bin; 507, third ventilation pipe; 508, first metering pump; 509, second metering pump; 510, fourth ventilation pipe; 601, U-shaped closing plate; 602, arc-shaped limiting track; 603, arc-shaped driving track; 604, electric slider; 605, strong magnetic attraction block; 606, second magnetic attraction block. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0020] A safety interlock device for continuously aminating p-chloro-o-nitroaniline disclosed by the present invention is mainly applied to the scenario of continuously aminating p-chloro-o-nitroaniline.

[0021] Refer to Figures 1-4, A safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination, comprising a kettle body 1. Inside the kettle body 1, a hollow support shaft 7 is provided. The outer wall of the hollow support shaft 7 is fixedly provided with a plurality of stirring blades 8 at equal intervals. The inner wall of the hollow support shaft 7 is fitted with a first condenser tube 10. One end of the first condenser tube 10 is provided with a condenser tube joint 3. The inner wall of the kettle body 1 is provided with a sandwich layer, and a third condenser tube is laid in the sandwich layer. One side of the kettle body 1 is simultaneously provided with a cooling mechanism 4 and a gas storage mechanism 5, and the cooling mechanism 4 is connected to the gas storage mechanism 5. An opening and closing mechanism 6 is provided on the inner wall of the kettle body 1; The cooling mechanism 4 includes a plurality of liquid passing tubes 402. A plurality of liquid passing ports are provided on the inner wall of one side of the kettle body 1, and the plurality of liquid passing ports are respectively connected to both ends of the plurality of liquid passing tubes 402. The outer wall of each liquid passing tube 402 is respectively wound with a second condenser tube 403, and an inclined liquid outlet 404 is provided at the same end of each liquid passing tube 402. There is a bent section at the connection between the inclined liquid outlet 404 and the liquid passing tube 402, and a multi-way connecting tube 405 is connected to the inner wall of the bent section of each liquid passing tube 402 at the same time. One end of the multi-way connecting tube 405 is connected to the gas storage mechanism 5 through a first gas pipe 407. A negative pressure pump 406 is provided in the middle section of the first gas pipe 407. An outer cover 401 covers the outside of the plurality of liquid passing tubes 402 at the same time. Among them, the third condenser tube is arranged in the sandwich layer of the kettle body 1. Through the third condenser tube and the first condenser tube 10, contact with the compound in the kettle body 1 is realized from the outer wall of the kettle body 1 and the central position of the kettle body 1 respectively to meet the cooling requirements of daily operations. In addition, under the action of the cooling mechanism 4, when it is detected that there is an explosion risk in the kettle body 1, the opening and closing mechanism 6 is automatically controlled to open, so that a plurality of liquid passing ports are leaked. Under the action of the negative pressure pump 406, while continuously sucking out the gas in the kettle body 1, one end of the inclined liquid outlet 404 is gradually in a negative pressure state, so that part of the compound liquid is sucked into the plurality of liquid passing tubes 402, and the cooling efficiency of the liquid in the liquid passing tubes 402 is improved by reducing the flow space. When the liquid that has been rapidly cooled enters the kettle body 1, the temperature balance can be completed through continuous stirring. In this structure, by simultaneously performing rapid cooling and gas extraction, the generation of explosion during the reaction can be effectively avoided.

[0022] Refer to Figure 1 , In a preferred embodiment, a bearing seat 3 is provided on the inner wall of the bottom end of the kettle body 1. One end of the hollow support shaft 7 is arranged in the bearing seat 3 and passes through the bearing seat 3. A feed inlet 2 is provided on the inner wall of the top end of the kettle body 1.

[0023] Refer to Figure 5 , In a preferred embodiment, the opening and closing mechanism 6 includes an arc-shaped limiting track 602. The arc-shaped limiting track 602 is fitted to the inner wall of the kettle body 1, and a U-shaped closing plate 601 is movably clamped in the arc-shaped limiting track 602.

[0024] Refer to Figure 5In a preferred embodiment, a second magnetic block 606 is fixedly connected to an outer wall of one side of the U-shaped closing plate 601, and the U-shaped closing plate 601 is attached to a plurality of liquid passages.

[0025] Reference Figure 5 In a preferred embodiment, an outer wall of one side of the kettle body 1 is fixedly connected with an arc-shaped driving track 603, and an electric slider 604 is movably connected in the arc-shaped driving track 603. The bottom end of the electric slider 604 is fixedly connected with a strong magnetic block 605, and the strong magnetic block 605 and the second magnetic block 606 are adsorbed in the air. The opening and closing mechanism 6 is used to switch the opening and closing states of the multiple liquid ports. When the electric slider 604 moves in the arc-shaped driving track 603, it can drive the strong magnetic block 605 to move along the outer wall of the kettle body 1, and then through the air adsorption of the strong magnetic block 605 and the second magnetic block 606, it synchronously drives the U-shaped closing plate 601 to move along the arc-shaped limiting track 602 to switch the opening and blocking states of the multiple liquid ports. The structure of driving the U-shaped closing plate 601 to move in the air can ensure the sealing of the kettle body 1 while realizing simultaneous control of multiple liquid ports.

[0026] Reference Figure 3 In a preferred embodiment, the gas storage mechanism 5 includes a first gas storage bin 501 and a second gas storage bin 506 , and the first gas storage bin 501 is connected to the first ventilation pipe 407 .

[0027] Reference Figure 3 In a preferred embodiment, a fourth vent pipe 510 is tightly connected to the inner wall of one side of the first gas storage bin 501 , one end of the fourth vent pipe 510 is inserted into the kettle body 1 , and a second metering pump 509 is provided in the middle section of the fourth vent pipe 510 .

[0028] Reference Figure 3 In a preferred embodiment, a second ventilation pipe 505 is connected between the first gas storage bin 501 and the second gas storage bin 506, and a card slot 502 is provided in the middle section of the second ventilation pipe 505, a clamping frame 504 is clamped in the card slot 502, and an ammonia nitrogen separation membrane 503 is clamped in the clamping frame 504.

[0029] Reference Figure 3, in a preferred embodiment, a third ventilation pipe 507 is fixedly connected to an inner wall on one side of the second gas storage chamber 506. One end of the third ventilation pipe 507 is inserted into the kettle body 1, and a first metering pump 508 is arranged in the middle section. The gas storage mechanism 5 can temporarily store the gas extracted by the cooling mechanism 4. After the gas in the kettle body 1, including ammonia and air, enters the first gas storage chamber 501 under the action of the negative pressure pump 406, it can continue to enter the second ventilation pipe 505. Blocked by the ammonia-nitrogen separation membrane 503, the ammonia in the mixed gas can be separated into the second gas storage chamber 506. Thus, when the gas is completely evacuated to ensure that the kettle body 1 does not explode, the first metering pump 508 and the second metering pump 509 can control the amount of the two gases entering the kettle body 1, thereby facilitating the control of the secondary reflux of the gas to facilitate continuous reaction.

[0030] Working principle: When the reaction is carried out in the kettle body 1, the third condenser is arranged in the interlayer of the kettle body 1, and the third condenser and the first condenser 10 are respectively in contact with the compound in the kettle body 1 through the outer wall of the kettle body 1 and the center position of the kettle body 1 to achieve the cooling demand of daily operation. In addition, the opening and closing state of the kettle body 1 and the cooling mechanism 4 are controlled by the opening and closing mechanism 6, and an interlocking structure designed for equipment safety and personal safety can be formed with the monitoring mechanism on the kettle body 1. Under the action of the cooling mechanism 4, when the risk of explosion is detected in the kettle body 1, the opening and closing mechanism is automatically controlled. 6 is opened to allow multiple liquid ports to leak out, wherein the opening and closing mechanism 6 is used to switch the opening and closing states of the multiple liquid ports. When the electric slider 604 moves in the arc-shaped driving track 603, it can drive the strong magnetic block 605 to move along the outer wall of the kettle body 1, and then through the air adsorption of the strong magnetic block 605 and the second magnetic block 606, it synchronously drives the U-shaped closing plate 601 to move along the arc-shaped limiting track 602 to switch the opening and blocking states of the multiple liquid ports. The structure of driving the U-shaped closing plate 601 to move through the air can achieve multiple liquid ports while ensuring the sealing of the kettle body 1. At the same time, the liquid outlet is controlled, and then under the action of the negative pressure pump 406, the gas in the kettle body 1 is continuously sucked out, and one end of the oblique liquid outlet 404 is gradually in a negative pressure state, so that part of the compound liquid is sucked into the multiple liquid pipes 402, and the cooling efficiency of the liquid in the liquid pipe 402 is improved by reducing the circulation space. When the liquid that has been rapidly cooled enters the kettle body 1, the temperature balance can be completed by continuous stirring. Under this structure, by rapidly cooling and pumping at the same time, the generation of explosion during the reaction can be effectively avoided. In addition, the gas storage mechanism 5 can pump the gas to the cooling mechanism 4. The gas extracted is temporarily stored, wherein the gas in the kettle body 1 including ammonia and air enters the first gas storage bin 501 under the action of the negative pressure pump 406, and can continue to enter the second vent pipe 505, and is blocked by the ammonia nitrogen separation membrane 503, so that the ammonia in the mixed gas can be separated into the second gas storage bin 506. Therefore, when the gas is completely extracted and the kettle body 1 is guaranteed not to explode, the amount of the two gases entering the kettle body 1 can be controlled by the first metering pump 508 and the second metering pump 509, thereby facilitating the control of the secondary reflux amount of the gas to facilitate continued reaction.

[0031] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination, comprising a kettle body (1), characterized in that, A hollow support shaft (7) is arranged inside the kettle body (1). A plurality of stirring blades (8) are fixedly arranged at equal intervals on the outer wall of the hollow support shaft (7). A first condensing pipe (10) is attached to the inner wall of the hollow support shaft (7). One end of the first condensing pipe (10) is provided with a condensing pipe joint (3). A sandwich layer is arranged on the inner wall of the kettle body (1), and a third condensing pipe is laid in the sandwich layer. A cooling mechanism (4) and a gas storage mechanism (5) are arranged on one side of the kettle body (1) at the same time, and the cooling mechanism (4) is connected to the gas storage mechanism (5). An opening and closing mechanism (6) is arranged on the inner wall of the kettle body (1); The cooling mechanism (4) includes a plurality of liquid passing pipes (402). A plurality of liquid passing ports are arranged on the inner wall of one side of the kettle body (1), and the plurality of liquid passing ports are respectively connected to both ends of the plurality of liquid passing pipes (402). A second condensing pipe (403) is wound around the outer wall of each liquid passing pipe (402), and an inclined liquid outlet (404) is arranged at the same end of each liquid passing pipe (402). There is a bent section at the connection between the inclined liquid outlet (404) and the liquid passing pipe (402), and a multi-way connecting pipe (405) is connected to the inner wall of the bent section of each liquid passing pipe (402) at the same time. One end of the multi-way connecting pipe (405) is connected to the gas storage mechanism (5) through a first gas pipe (407). A negative pressure pump (406) is arranged in the middle section of the first gas pipe (407). An outer cover (401) covers the outside of the plurality of liquid passing pipes (402).

2. The safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination according to claim 1, characterized in that, A bearing seat (3) is arranged on the inner wall of the bottom end of the kettle body (1). One end of the hollow support shaft (7) is arranged in the bearing seat (3) and passes through the bearing seat (3). A feed inlet (2) is arranged on the inner wall of the top end of the kettle body (1).

3. The safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination according to claim 1, characterized in that, The opening and closing mechanism (6) includes an arc-shaped limiting track (602). The arc-shaped limiting track (602) is attached to the inner wall of the kettle body (1), and a U-shaped closing plate (601) is movably clamped in the arc-shaped limiting track (602).

4. The safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination according to claim 3, characterized in that, A second magnetic attraction block (606) is fixedly connected to the outer wall of one side of the U-shaped closing plate (601). The U-shaped closing plate (601) is attached to the plurality of liquid passing ports.

5. The safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination according to claim 4, wherein, An arc-shaped driving track (603) is fixedly connected to the outer wall of one side of the kettle body (1). An electric slider (604) is movably connected in the arc-shaped driving track (603). A strong magnetic attraction block (605) is fixedly connected to the bottom end of the electric slider (604). The strong magnetic attraction block (605) is magnetically attracted to the second magnetic attraction block (606) at a distance.

6. The safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination according to claim 1, characterized in that, The gas storage mechanism (5) includes a first gas storage bin (501) and a second gas storage bin (506). The first gas storage bin (501) is connected to the first gas pipe (407).

7. The safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination according to claim 6, characterized in that, A fourth gas pipe (510) is closely connected to the inner wall of one side of the first gas storage bin (501). One end of the fourth gas pipe (510) is inserted into the kettle body (1), and a second metering pump (509) is arranged in the middle section of the fourth gas pipe (510).

8. The safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination according to claim 7, characterized in that, A second ventilation pipe (505) is connected between the first gas storage chamber (501) and the second gas storage chamber (506), and a clamping groove (502) is provided in the middle section of the second ventilation pipe (505). A clamping bracket (504) is clamped in the clamping groove (502), and an ammonia-nitrogen separation membrane (503) is clamped in the clamping bracket (504).

9. The safety interlock device for continuously preparing p-chloro-o-nitroaniline by amination according to claim 8, characterized in that, A third ventilation pipe (507) is fixedly connected to one inner wall of the second gas storage chamber (506). One end of the third ventilation pipe (507) is inserted into the kettle body (1), and a first metering pump (508) is provided in the middle section.

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