A centrifugal water washing cleaning equipment for removing harmful substances from the air.

Abstract

This utility model relates to the field of air purification technology and discloses a centrifugal water washing cleaning device for removing harmful substances from the air. It includes a tank, with a top cover bolted to the top of the tank. Four connecting blocks are equidistantly connected to the inner side of the tank near the top, and a common guide tube is fixedly connected between the four connecting blocks. A self-cleaning mechanism is located in the middle of the inner side of the tank. The self-cleaning mechanism includes a connecting plate fixedly connected to the middle of the inner wall of the tank. A rotating cylinder is rotatably connected to the top center of the connecting plate. A circular hole adapted to the rotating cylinder is opened in the middle of the connecting plate. A square frame is fixedly connected to the top of the rotating cylinder, and a vertical rod is fixedly connected to the top center of the square frame. This utility model achieves automatic cleaning of the tank and guide tube without manual disassembly, significantly reducing manual maintenance costs and operational difficulty, improving equipment maintenance convenience, and ensuring the continuous and stable purification effect of centrifugal water washing.

Description

Technical Field

[0001] This utility model relates to the field of air purification technology, and in particular to a centrifugal water washing cleaning device for removing harmful substances from the air. Background Technology

[0002] With the acceleration of industrialization and the improvement of people's living standards, air quality has become an increasingly important concern. The air contains a variety of harmful substances, such as dust, smoke, bacteria, viruses, and harmful gases (such as formaldehyde, benzene, sulfur dioxide, and nitrogen oxides). These pollutants not only directly harm human health, causing respiratory and cardiovascular diseases, but also affect the production environment, reduce production efficiency, and cause corrosion and damage to industrial equipment. For example, industries such as electronics manufacturing, food processing, and pharmaceutical manufacturing have extremely high requirements for air quality, and even tiny pollutants can lead to a decline in product quality or even scrapping.

[0003] Currently, common air purification technologies include filtration, adsorption, and centrifugal purification devices. Among existing technologies, centrifugal purification devices do not require frequent replacement of parts to ensure air purification quality and increase operating costs, unlike filtration and adsorption devices. However, impurities can accumulate inside centrifugal purification devices over time, leading to reduced air purification efficiency. Therefore, a centrifugal water washing cleaning device for removing harmful substances from the air has been designed. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a centrifugal water washing cleaning device for removing harmful substances from the air.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A centrifugal water washing cleaning device for removing harmful substances from the air includes a tank. A top cover is bolted to the top of the tank. Four connecting blocks are equidistantly connected to the inner side of the tank near the top. A common guide tube is fixedly connected between the four connecting blocks. A self-cleaning mechanism is located in the middle of the inner side of the tank. The self-cleaning mechanism includes a connecting plate fixedly connected to the middle of the inner wall of the tank. A rotating cylinder is rotatably connected to the top center of the connecting plate. A circular hole adapted to the rotating cylinder is opened in the center of the connecting plate. A square frame is fixedly connected to the top of the rotating cylinder. A vertical rod is fixedly connected to the top center of the square frame, and a turntable is fixedly connected to the top of the vertical rod. Multiple slots are equidistantly opened on the circumference of the turntable. A horizontal tube is fixedly fitted in the middle of the square frame, and both sides of the square frame have slots adapted to the horizontal tube. The self-cleaning mechanism includes a circular hole, a connecting pipe fixedly connected to the middle of the bottom of the horizontal tube, and an L-shaped water supply pipe rotatably connected to the bottom of the connecting pipe via a rotating joint. The other end of the L-shaped water supply pipe passes through the tank body. The tank body has a circular hole adapted to the L-shaped water supply pipe. The self-cleaning mechanism also includes a first oblique nozzle fixedly connected to both sides of the middle of the top of the horizontal tube, and the first oblique nozzle is adapted to the inner wall of the guide tube. A second oblique nozzle is fixedly connected to one end of the top of the horizontal tube, and the second oblique nozzle is adapted to the outer wall of the guide tube. A third oblique nozzle is fixedly connected to the top of the other end of the horizontal tube, and a fourth oblique nozzle is fixedly connected to the bottom of the same end of the horizontal tube. Both the third and fourth oblique nozzles are adapted to the inner wall of the tank body. Through the setting of the self-cleaning mechanism, when the synchronous motor rotates at low speed, the inside and outside of the tank body can be rinsed.

[0007] Preferably, a fixing ring is fixedly connected to the middle of the inner side of the top cover, and multiple air inlets are evenly spaced on the circumference of the fixing ring. An inner cylinder is fixedly connected to the inner wall of the circumference of the fixing ring. A top plate is fixedly connected to the top of the top cover, and a sealing gasket is provided between the top plate, the top cover, and the inner cylinder.

[0008] Preferably, a synchronous motor is fixedly connected to the middle of the top of the top plate, and a rotating rod is fixedly connected to the bottom output end of the synchronous motor through the top plate. A cross plate is fixedly connected to the bottom of the rotating rod through the inner cylinder, and an impeller is fixedly connected to the outer end of the cross plate. The impeller is adapted to the inner cylinder and the guide cylinder respectively. A linkage mechanism adapted to the self-cleaning mechanism is provided on both sides of the bottom middle of the cross plate. Through the setting of the linkage mechanism, the synchronous motor can drive the self-cleaning mechanism to operate only at low speed.

[0009] Preferably, the linkage mechanism includes a strip frame fixedly connected to the bottom of the cross plate near the middle side, and a counterweight slider is slidably connected inside the strip frame. A guide rod is fixedly connected between the two ends of the strip frame, and the guide rod slides through the counterweight slider. The counterweight slider has a circular hole adapted to the guide rod. A locking block is fixedly connected to the bottom of the counterweight slider, and the locking block is adapted to the locking slot. A first magnet is fixedly connected to the end of the inner wall of the strip frame away from the rotating rod, and a second magnet is fixedly connected to the end of the locking block near the first magnet. The second magnet and the first magnet have the same magnetism on the side that is close to each other.

[0010] Preferably, the top cover is fixedly fitted with a connecting tube at the bottom of the fixing ring, the top cover has a round hole adapted to the connecting tube, one end of the connecting tube inside the top cover is fixedly connected to an annular tube, and multiple atomizing nozzles are fixedly connected at equal intervals at the bottom of the annular tube.

[0011] Preferably, an air inlet pipe is fixedly connected to the outer wall of the top cover at the top of the air inlet hole, and the air inlet pipe is connected to the top cover.

[0012] Preferably, an exhaust pipe is fixedly connected to the outer wall of the inner cylinder at the top of the fixing ring, and the inner cylinder is connected to the exhaust pipe. The other end of the exhaust pipe is fixedly inserted through the top cover, and a round hole adapted to the top cover is provided on the top cover.

[0013] Preferably, a conical block is fixedly connected to the inner side of the tank near the bottom, and multiple notches are equally spaced on the edge of the conical block.

[0014] Preferably, a drain pipe is provided at the bottom of the outer wall of the tank, and a solenoid valve is installed on the drain pipe, and a level gauge is fixedly installed at the bottom of the outer wall of the tank.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. By employing a self-cleaning mechanism, a linkage mechanism, and a synchronous motor, when the synchronous motor speed is low, the locking block engages with the locking slot, allowing the synchronous motor to drive the horizontal tube to rotate. This enables the tank interior and the inside and outside of the guide tube to be rinsed, reducing maintenance frequency and effectively solving the problem of existing devices not being able to self-clean, as mentioned in the background technology. This achieves automatic cleaning of the tank and guide tube without manual disassembly of the equipment, significantly reducing manual maintenance costs and operational difficulty, improving the ease of equipment maintenance, and ensuring the continuous and stable effect of centrifugal water washing and purification.

[0017] 2. Through the cooperation of the air inlet pipe, atomizing nozzle, impeller and guide tube, air is drawn into the tank and fully contacts the water mist. This allows impurities in the air to combine with the water mist and remain at the bottom of the tank. The purified air is then discharged from the exhaust pipe, thus achieving the effect of air purification. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a centrifugal water washing cleaning equipment for removing harmful substances from the air, as proposed in this utility model.

[0019] Figure 2 This is a cross-sectional structural diagram of the tank of a centrifugal water washing cleaning equipment for removing harmful substances from the air, as proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the self-cleaning mechanism of a centrifugal water washing cleaning equipment for removing harmful substances from the air, as proposed in this utility model.

[0021] Figure 4 This utility model proposes a centrifugal water washing cleaning device for removing harmful substances from the air. Figure 3 An enlarged structural diagram at point A;

[0022] Figure 5 This is a partial structural diagram of the self-cleaning mechanism of a centrifugal water washing cleaning equipment for removing harmful substances from the air, as proposed in this utility model.

[0023] Figure 6 This is a cross-sectional structural diagram of the top cover of a centrifugal water washing cleaning equipment for removing harmful substances from the air, as proposed in this utility model.

[0024] Figure 7 This is a schematic diagram of the internal structure of the top cover of a centrifugal water washing cleaning equipment for removing harmful substances from the air, as proposed in this utility model.

[0025] Figure 8 This is a schematic diagram of the impeller of a centrifugal water washing cleaning device for removing harmful substances from the air, as proposed in this utility model.

[0026] Figure 9 This utility model proposes a centrifugal water washing cleaning device for removing harmful substances from the air. Figure 8 An enlarged structural diagram at point B.

[0027] In the diagram: 1. Tank body; 101. Solenoid valve; 102. Level gauge; 103. Conical block; 104. Groove; 2. Top cover; 201. Top plate; 202. Annular pipe; 203. Atomizing nozzle; 204. Connecting pipe; 205. Fixing ring; 206. Air inlet; 207. Inner cylinder; 208. Air inlet pipe; 209. Exhaust pipe; 3. Connecting block; 301. Guide cylinder; 4. Self-cleaning mechanism; 401. Connecting plate; 402. Rotating drum; 403. L-shaped water pipe; 404, Frame; 405, Horizontal tube; 406, Vertical rod; 407, Turntable; 408, Slot; 409, First angled nozzle; 410, Second angled nozzle; 411, Third angled nozzle; 412, Fourth angled nozzle; 5, Synchronous motor; 501, Rotating rod; 502, Cross plate; 503, Impeller; 6, Linkage mechanism; 601, Strip frame; 602, Counterweight slider; 603, Locking block; 604, Guide rod; 605, First magnet; 606, Second magnet. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] Reference Figures 1-9A centrifugal water washing cleaning device for removing harmful substances from the air includes a tank 1. A top cover 2 is bolted to the top of the tank 1. Four connecting blocks 3 are fixedly connected at equal intervals around the circumference of the inner side of the tank 1 near the top. A common guide tube 301 is fixedly connected between the four connecting blocks 3. A self-cleaning mechanism 4 is provided in the middle of the inner side of the tank 1. The self-cleaning mechanism 4 includes a connecting plate 401 fixedly connected to the middle of the inner wall of the tank 1. A rotating cylinder 402 is rotatably connected to the top center of the connecting plate 401. A circular hole adapted to the rotating cylinder 402 is opened in the middle of the connecting plate 401. A square frame 404 is fixedly connected to the top of the rotating cylinder 402. A vertical rod 406 is fixedly connected to the top center of the square frame 404. A turntable 407 is fixedly connected to the top of the vertical rod 406. Multiple slots 408 are evenly opened on the circumferential edge of the turntable 407. A horizontal tube 405 is fixedly fitted in the middle of the square frame 404. Both sides of the square frame 404 have slots for the horizontal tube 405. The horizontal tube 405 has a matching round hole, and a connecting pipe is fixedly connected to the middle of its bottom. The bottom of the connecting pipe is rotatably connected to an L-shaped water supply pipe 403 via a rotating joint. The other end of the L-shaped water supply pipe 403 passes through the tank body 1. The tank body 1 has a round hole that matches the L-shaped water supply pipe 403. The self-cleaning mechanism 4 also includes a first inclined nozzle 409 fixedly connected to both sides of the middle of the top of the horizontal tube 405, and the first inclined nozzle 409 matches the inner wall of the guide tube 301. A second inclined nozzle 410 is fixedly connected to one end of the top of the horizontal pipe 405, and the second inclined nozzle 410 is adapted to the outer wall of the guide tube 301. A third inclined nozzle 411 is fixedly connected to the top of the other end of the horizontal pipe 405, and a fourth inclined nozzle 412 is fixedly connected to the bottom of the same end of the horizontal pipe 405. Both the third inclined nozzle 411 and the fourth inclined nozzle 412 are adapted to the inner wall of the tank 1. Through the setting of the self-cleaning mechanism 4, the inside of the tank 1 can achieve a certain degree of self-cleaning.

[0030] In this utility model, a fixing ring 205 is fixedly connected to the middle of the inner side of the top cover 2, and multiple air inlets 206 are equally spaced on the circumference of the fixing ring 205. An inner cylinder 207 is fixedly connected to the inner wall of the circumference of the fixing ring 205. A top plate 201 is fixedly connected to the top of the top cover 2, and a sealing gasket is provided between the top plate 201, the top cover 2, and the inner cylinder 207.

[0031] In this utility model, a synchronous motor 5 is fixedly connected to the middle of the top of the top plate 201, and a rotating rod 501 is fixedly connected to the bottom output end of the synchronous motor 5 through the top plate 201. A cross plate 502 is fixedly connected to the bottom of the rotating rod 501 through the inner cylinder 207, and an impeller 503 is fixedly connected to the outer end of the cross plate 502. The impeller 503 is adapted to the inner cylinder 207 and the guide cylinder 301 respectively. A linkage mechanism 6 adapted to the self-cleaning mechanism 4 is provided on both sides of the bottom middle of the cross plate 502.

[0032] In this invention, the linkage mechanism 6 includes a strip frame 601 fixedly connected to the bottom of the cross plate 502 near the middle side, and a counterweight slider 602 slidably connected inside the strip frame 601. A guide rod 604 is fixedly connected between the two ends of the strip frame 601, and the guide rod 604 slides through the counterweight slider 602. The counterweight slider 602 has a round hole adapted to the guide rod 604. A locking block 603 is fixedly connected to the bottom of the counterweight slider 602, and the locking block 603 is adapted to the locking groove 408. A first magnet 605 is fixedly connected to the end of the inner wall of the strip frame 601 away from the rotating rod 501, and a second magnet 606 is fixedly connected to the end of the locking block 603 near the first magnet 605. The second magnet 606 and the first magnet 605 have the same magnetism on the side that are close to each other. Through the setting of the linkage mechanism 6, the synchronous motor 5 can drive the self-cleaning mechanism 4 to operate only at a small speed. At a high speed, the self-cleaning mechanism 4 will not operate.

[0033] In this utility model, a connecting tube 204 is fixedly sleeved on the bottom of the fixing ring 205 in the top cover 2. A round hole adapted to the connecting tube 204 is opened on the top cover 2. An annular tube 202 is fixedly connected to one end of the connecting tube 204 inside the top cover 2. Multiple atomizing nozzles 203 are fixedly connected at equal intervals at the bottom of the annular tube 202. The water vapor sprayed by the atomizing nozzles 203 combines with the air to achieve air cleaning.

[0034] In this utility model, an air inlet pipe 208 is fixedly connected to the outer wall of the top cover 2 at the top of the air inlet 206, and the air inlet pipe 208 is connected to the top cover 2.

[0035] In this utility model, an exhaust pipe 209 is fixedly connected to the outer wall of the inner cylinder 207 at the top of the fixing ring 205, and the inner cylinder 207 is connected to the exhaust pipe 209. The other end of the exhaust pipe 209 is fixedly inserted through the top cover 2, and a round hole adapted to the top cover 2 is opened on the top cover 2.

[0036] In this utility model, a conical block 103 is fixedly connected to the inner side of the tank 1 near the bottom, and multiple notches 104 are equally spaced on the edge of the conical block 103, which facilitates drainage.

[0037] In this utility model, a drain pipe is provided at the bottom of the outer wall of the tank 1, and a solenoid valve 101 is installed on the drain pipe. A level gauge 102 is fixedly installed at the bottom of the outer wall of the tank 1, and the level gauge 102 can detect the amount of water at the bottom of the tank 1.

[0038] Working principle: The synchronous motor 5 of this device is controlled by a frequency converter to control its speed. During use, the connecting pipe 204 is connected to the water supply pipe, and the synchronous motor 5 is turned on, causing the impeller 503 to rotate at high speed. The rotation of the impeller 503 causes the air in the space between the inner cylinder 207 and the top cover 2 to move towards the lower tank 1, thus generating negative pressure. This causes the air inlet pipe 208 to draw air from the outside into the tank 1. During this process, the air enters the tank 1 and interacts with the atomizing nozzle 203. The sprayed water mist, combined with the centrifugal force generated by the high-speed rotating impeller 503, causes the water to form a water film or droplets. Under the influence of centrifugal force, the air mixes thoroughly with the water. Harmful substances in the air (such as dust and some gaseous pollutants) are adsorbed or dissolved by the water. The water droplets, after air cleaning, remain on the inner wall of tank 1 under centrifugal force and gradually sink under gravity, settling at the bottom of tank 1. The water level can be monitored using level gauge 102. When sufficient water is available, the solenoid valve 101 opens to discharge the purified air. When the gas moves to the bottom of the tank 1, it rises from the middle of the guide tube 301, passes through the inner cylinder 207, and is discharged from the exhaust pipe 209. When it is necessary to clean the inner wall of the tank 1 and the guide tube 301 after long-term use, connect the L-shaped water supply pipe 403 to the water pipe to supply water, or supply water with added cleaning agent. Then start the synchronous motor 5, so that the synchronous motor 5 rotates at a low speed. Due to the low speed, the counterweight slider 602 and the locking block 603 cannot move under the action of a small centrifugal force. Overcoming the repulsive force between the first magnet 605 and the second magnet 606, the locking block 603 engages with the locking slot 408, allowing the synchronous motor 5 to drive the vertical rod 406, the square frame 404, and the horizontal tube 405 to rotate. This enables the two first oblique nozzles 409 to rinse the inside of the guide tube 301, the third oblique nozzle 411 and the fourth oblique nozzle 412 to rinse the inner wall of the tank 1, and the third oblique nozzle 411 to rinse the outer wall of the guide tube 301. This reduces the number of times the device needs to be cleaned and improves the air purification quality.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A centrifugal water washing cleaning device for removing harmful substances from the air, comprising a tank (1), characterized in that, The top of the tank (1) is fixedly connected to a top cover (2) by bolts. Four connecting blocks (3) are fixedly connected at equal intervals around the circumference of the inner side of the tank (1) near the top. The four connecting blocks (3) are fixedly connected to the same guide tube (301). A self-cleaning mechanism (4) is provided in the middle of the inner side of the tank (1). The self-cleaning mechanism (4) includes a connecting plate (401) fixedly connected to the middle of the inner wall of the tank (1). A rotating cylinder (402) is rotatably connected to the top middle of the connecting plate (401). A circular hole adapted to the rotating cylinder (402) is opened in the middle of the connecting plate (401). A square frame (404) is fixedly connected to the top of the rotating cylinder (402). A vertical rod (406) is fixedly connected to the top center of the frame (404), and a turntable (407) is fixedly connected to the top of the vertical rod (406). Multiple slots (408) are evenly spaced on the circumferential edge of the turntable (407). A horizontal tube (405) is fixedly fitted in the middle of the frame (404). Round holes adapted to the horizontal tube (405) are opened on both sides of the frame (404). A connecting pipe is fixedly connected to the bottom center of the horizontal tube (405). An L-shaped water pipe (403) is rotatably connected to the bottom of the connecting pipe through a rotating joint. The other end of the L-shaped water pipe (403) passes through the tank (1). A round hole adapted to the L-shaped water pipe (403) is opened on the tank (1).

2. The centrifugal water washing equipment for removing harmful substances from air according to claim 1, characterized in that, The self-cleaning mechanism (4) further includes a first oblique nozzle (409) fixedly connected to the middle two sides of the top of the horizontal tube (405), and the first oblique nozzle (409) is adapted to the inner wall of the guide tube (301). A second oblique nozzle (410) is fixedly connected to one end of the top of the horizontal tube (405), and the second oblique nozzle (410) is adapted to the outer wall of the guide tube (301). A third oblique nozzle (411) is fixedly connected to the top of the other end of the horizontal tube (405), and a fourth oblique nozzle (412) is fixedly connected to the bottom of the same end of the horizontal tube (405). Both the third oblique nozzle (411) and the fourth oblique nozzle (412) are adapted to the inner wall of the tank (1).

3. The centrifugal water washing equipment for removing harmful substances from the air according to claim 1, characterized in that, A fixing ring (205) is fixedly connected to the middle of the inner side of the top cover (2), and multiple air inlets (206) are evenly spaced on the circumference of the fixing ring (205). An inner cylinder (207) is fixedly connected to the inner wall of the fixing ring (205). A top plate (201) is fixedly connected to the top of the top cover (2), and a sealing gasket is provided between the top plate (201), the top cover (2), and the inner cylinder (207).

4. The centrifugal water washing equipment for removing harmful substances from the air according to claim 3, characterized in that, A synchronous motor (5) is fixedly connected to the middle of the top of the top plate (201), and a rotating rod (501) is fixedly connected to the bottom output end of the synchronous motor (5) through the top plate (201). A cross plate (502) is fixedly connected to the bottom of the rotating rod (501) through the inner cylinder (207), and an impeller (503) is fixedly connected to the outer end of the cross plate (502). The impeller (503) is adapted to the inner cylinder (207) and the guide cylinder (301) respectively. A linkage mechanism (6) adapted to the self-cleaning mechanism (4) is provided on both sides of the bottom middle of the cross plate (502).

5. The centrifugal water washing equipment for removing harmful substances from the air according to claim 4, characterized in that, The linkage mechanism (6) includes a strip frame (601) fixedly connected to the bottom of the cross plate (502) near the middle side, and a counterweight slider (602) is slidably connected inside the strip frame (601). A guide rod (604) is fixedly connected between the two ends of the strip frame (601), and the guide rod (604) slides through the counterweight slider (602). The counterweight slider (602) has a round hole that matches the guide rod (604). A locking block (603) is fixedly connected to the bottom of the counterweight slider (602), and the locking block (603) is adapted to the slot (408). A first magnet (605) is fixedly connected to the end of the inner wall of the strip frame (601) away from the rotating rod (501), and a second magnet (606) is fixedly connected to the end of the locking block (603) close to the first magnet (605). The second magnet (606) and the first magnet (605) have the same magnetism on the side that are close to each other.

6. The centrifugal water washing equipment for removing harmful substances from air according to claim 1, characterized in that, The top cover (2) is fixedly fitted with a connecting tube (204) at the bottom of the fixing ring (205). The top cover (2) has a round hole that matches the connecting tube (204). One end of the connecting tube (204) inside the top cover (2) is fixedly connected to an annular tube (202), and multiple atomizing nozzles (203) are fixedly connected at equal intervals at the bottom of the annular tube (202).

7. The centrifugal water washing equipment for removing harmful substances from air according to claim 1, characterized in that, An air inlet pipe (208) is fixedly connected to the outer wall of the top cover (2) at the top of the air inlet (206), and the air inlet pipe (208) is connected to the top cover (2).

8. The centrifugal water washing equipment for removing harmful substances from the air according to claim 3, characterized in that, The outer wall of the inner cylinder (207) is fixedly connected to the top of the fixing ring (205) with an exhaust pipe (209), and the inner cylinder (207) and the exhaust pipe (209) are connected. The other end of the exhaust pipe (209) is fixedly connected through the top cover (2), and the top cover (2) has a round hole that is compatible with the top cover (2).

9. The centrifugal water washing equipment for removing harmful substances from air according to claim 1, characterized in that, A conical block (103) is fixedly connected to the inner side of the tank (1) near the bottom, and multiple notches (104) are equally spaced on the edge of the conical block (103).

10. A centrifugal water washing cleaning device for removing harmful substances from air according to claim 1, characterized in that, A drain pipe is provided at the bottom of the outer wall of the tank (1), and a solenoid valve (101) is installed on the drain pipe. A level gauge (102) is fixedly installed at the bottom of the outer wall of the tank (1).

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