A solvent recovery device

Abstract

The present invention relates to the technical field of solvent recovery devices, and in particular to a solvent recovery device, the technical solution of which includes a tank body, a guide assembly and a separation assembly, a condensation hood fixedly mounted on the inner wall of the tank body, the condensation hood being a conical structure, and a circular liquid guide platform being provided at the bottom of the condensation hood, a heat-conducting hood being welded to the top of the condensation hood, and a plurality of heat-conducting rods being welded to the top of the heat-conducting hood; and a top cover being mounted on the top of the tank body by bolts. The present invention installs an evaporation disk on the top of a spiral plate, which can drive the solvent to flow evenly to the top of the evaporation disk through the rotation of the spiral plate, and adopts an evaporation disk made of a material with a high thermal conductivity coefficient, so that during the operation of the device, the temperature of the evaporation disk is higher than the internal ambient temperature of the tank body, thereby forming a large temperature difference with the solvent inside the liquid storage tank, so as to facilitate the distillation recovery of different components, thereby expanding the scope of application of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of solvent recovery devices, in particular to a solvent recovery device. Background Art

[0002] Solvent recovery and separation equipment plays an important role in the chemical, pharmaceutical, paint and other industries. It is mainly used to recover and reuse organic solvents used in the production process. These equipment separates the effective components in the waste solvents through process steps such as distillation and condensation, thereby realizing the recycling of resources and reducing costs. With the increasingly stringent environmental protection regulations and the continuous increase in production costs, solvent recovery technology has received widespread attention and application. Therefore, we propose a solvent recovery device.

[0003] The prior art also has the following defects during use:

[0004] When the solvent recovery device in the prior art separates the effective components in the organic solvent, a single distillation and condensation recovery is not sufficient to recover multiple components in the solvent, so multiple solvent recovery treatments are required to facilitate separate recovery of multiple components in the solvent, which increases the number of solvent recovery steps and reduces the efficiency of solvent recovery.

[0005] In view of this, we propose a solvent recovery device to solve the existing problems. Summary of the Invention

[0006] The object of the present invention is to provide a solvent recovery device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a solvent recovery device, comprising a tank body, a guide assembly, and a separation assembly; a condensation hood is fixedly mounted on the inner wall of the tank body; the condensation hood is a conical structure, and a circular liquid guide platform is provided at the bottom of the condensation hood; a heat conductive hood is welded to the top of the condensation hood; and a plurality of heat conductive rods are welded to the top of the heat conductive hood;

[0008] A top cover is installed on the top of the tank body by bolts, a T-shaped tube is fixedly installed on the top of the top cover, and a vacuum pump is installed on the side of the T-shaped tube through a hose;

[0009] A separation assembly is fixedly installed inside the tank body, and the separation assembly includes a liquid storage tank, a heating wire is installed around the liquid storage tank, a plurality of connecting frames are fixedly installed on the bottom of the liquid storage tank, and the connecting frames are fixedly connected to the inner wall of the tank body, a drive shaft is longitudinally installed inside the liquid storage tank through a bearing, and the drive shaft passes through the liquid storage tank and extends to the bottom of the liquid storage tank, a spiral plate is welded to the side of the drive shaft, an evaporation disk is welded to the side of the drive shaft at the top position of the spiral plate, the evaporation disk and the top of the spiral plate are on the same horizontal plane, and a fan-shaped notch is opened in the evaporation disk, a plurality of guide grooves are provided on the top surface of the evaporation disk, and the evaporation disk is made of silicon carbide ceramic material;

[0010] A guide assembly is fixedly installed on the outside of the liquid storage tank, and the guide assembly includes a heat insulation cover, which is fixedly connected to the side wall of the liquid storage tank, and a plurality of support shaft frames are fixedly installed on the side of the heat insulation cover, and a gear ring is installed on the top of the support shaft frame, and a guide plate is fixedly installed on the bottom side of the gear ring, one side of the guide plate is in contact with the liquid guide platform on the inner side of the condensation cover, and a groove is provided on the top of the guide plate, and a plurality of longitudinally arranged drainage holes are provided inside the groove, and the drainage holes pass through the top and bottom of the guide plate, and a plurality of racks are provided on the top of the gear ring.

[0011] Preferably, an electric motor is fixedly mounted on the bottom of the liquid storage tank, and the output shaft of the electric motor is fixedly connected to the drive shaft.

[0012] Preferably, a waste pipe is fixedly installed inside the tank body, the top end of the waste pipe extends to the bottom surface inside the liquid storage tank, and the bottom end of the waste pipe passes through the bottom of the tank body and extends out of the tank body.

[0013] Preferably, the bottom of the tank body is a conical structure, and a plurality of support frames are fixedly installed on the bottom of the tank body, and a bottom plate is fixedly installed on the bottom of the support frame.

[0014] Preferably, a discharge pipe is fixedly installed at the bottom of the tank body, and an electric butterfly valve is fixedly installed at the connection position between the discharge pipe and the tank body.

[0015] Preferably, an air pressure detector is fixedly mounted on one side of the top of the top cover, and a detection end of the air pressure detector passes through the top cover and extends to the interior of the tank body.

[0016] Preferably, a guide pipe is fixedly installed at the central position of the heat-conducting cover and the condensation cover, and the top end of the guide pipe is consistent with the bottom end of the T-shaped tube.

[0017] Preferably, a plurality of recovery boxes are fixedly installed inside the tank body, the recovery boxes are fan-shaped groove structures, and electromagnetic valves are fixedly installed at the bottom of the recovery boxes. A cooling fan is fixedly installed on the side of the tank body above the heat-conducting cover.

[0018] Preferably, a driving roller is clamped and installed above the gear ring, a driving motor is fixedly installed on one side of the driving roller, and the driving motor is fixedly connected to the inner wall of the condensation hood.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention installs an evaporation plate on the top of the spiral plate, which can drive the solvent to flow evenly to the top of the evaporation plate through the rotation of the spiral plate. In addition, by adopting the evaporation plate made of high thermal conductivity material, the temperature of the evaporation plate is higher than the internal ambient temperature of the tank body during the operation of the device, thereby forming a large temperature difference with the solvent inside the liquid storage tank, so as to facilitate the distillation and recovery of different components, thereby expanding the scope of application of the device.

[0021] The present invention installs a guide plate at the bottom of the gear ring, and the guide plate contacts the inner wall of the condensation hood to guide the liquid condensed on the inner wall of the condensation hood, so that solvents of different components fall into different recovery boxes respectively. In this way, the device can realize the recovery of multiple components during the solvent recovery process, thereby improving the efficiency of the device for solvent recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the present invention;

[0024] Figure 3 It is a schematic diagram of a first partial three-dimensional cross-sectional structure of the present invention;

[0025] Figure 4 is a schematic diagram of a second partial three-dimensional cross-sectional structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the front structure of the present invention;

[0027] Figure 6 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0028] Figure 7 It is a schematic diagram of a first partial front cross-sectional structure of the present invention;

[0029] Figure 8 It is a schematic diagram of the second partial front cross-sectional structure of the present invention.

[0030] In the figure: 1. Top cover; 101. T-shaped tube; 102. Air pressure detector; 103. Vacuum pump; 2. Tank body; 201. Support frame; 202. Bottom plate; 203. Discharge pipe; 204. Waste pipe; 205. Heat conduction rod; 206. Diversion pipe; 207. Heat conduction cover; 208. Recovery box; 209. Condensation cover; 210. Cooling fan; 3. Guide assembly; 301. Support shaft frame; 302. Gear ring; 303. Diversion plate; 304. Insulation cover; 305. Drive roller; 306. Drive motor; 4. Separation assembly; 401. Liquid storage tank; 402. Heating wire; 403. Connecting frame; 404. Motor; 405. Drive shaft; 406. Spiral plate; 407. Evaporation plate. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 - Figure 8 As shown, a solvent recovery device proposed by the present invention includes a tank body 2, a guide component 3 and a separation component 4. A condensation hood 209 is fixedly installed on the inner wall of the tank body 2. The condensation hood 209 is a conical structure, and a circular liquid guide platform is provided at the bottom of the condensation hood 209. A heat-conducting hood 207 is welded on the top of the condensation hood 209, and a plurality of heat-conducting rods 205 are welded on the top of the heat-conducting hood 207. The tank body 2 is used to provide a mounting position for the surrounding components and cooperates with the top cover 1 to provide a closed environment for the solvent recovery process. The condensation hood 209 can conduct the temperature of the top and bottom, thereby cooperating with the heat-conducting hood 207 to make the condensation The temperature of the condensation cover 209 itself drops. When the condensation cover 209 contacts the solvent vapor, the solvent vapor is liquefied at the bottom of the condensation cover 209, thereby completing the recovery of the effective components in the solvent. The heat-conducting cover 207 is made of thermoelectric material. After the heat-conducting cover 207 is energized, a large temperature difference is generated between the top and bottom of the heat-conducting cover 207, thereby quickly conducting heat and promoting the cooling of the condensation cover 209. The heat-conducting rod 205 cooperates with the heat-conducting cover 207 to expand the heat dissipation area of ​​the heat-conducting cover 207, thereby enabling the heat inside the tank body 2 to be quickly discharged, thereby assisting the cooling of the condensation cover 209 and liquefying the solvent vapor.

[0033] The top of the tank body 2 is fixed with a top cover 1 by bolts, and a T-shaped tube 101 is fixedly installed on the top of the top cover 1. A vacuum pump 103 is installed on the side of the T-shaped tube 101 through a hose. The top cover 1 can cooperate with the tank body 2 to form a closed space to facilitate the recovery of the solvent, and the top cover 1 can be opened to facilitate the assembly and maintenance of the components inside the tank body 2. Valves are installed at the three ports of the T-shaped tube 101, which can be controlled separately. The T-shaped tube 101 can be connected to an external pipeline to allow the solvent to be recycled. The solvent is injected into the tank body 2, and at the same time, the vacuum pump 103 can be used to evacuate the interior of the tank body 2, thereby reducing the ambient air pressure inside the tank body 2. By reducing the air pressure and electrically heating, the solvent is evaporated, thereby improving the efficiency of the device for solvent recovery. The vacuum pump 103 adopts a 2XZ-2 type. After the vacuum pump 103 is powered on, it can evacuate the interior of the tank body 2 through the T-shaped tube 101, thereby reducing the ambient air pressure value inside the tank body 2. By reducing the air pressure value, the boiling point of the solvent is reduced, thereby promoting solvent evaporation and recovery;

[0034] The interior of the tank body 2 is fixedly installed with a separation component 4, which includes a liquid storage tank 401. A heating wire 402 is installed around the liquid storage tank 401. A plurality of connecting frames 403 are fixedly installed at the bottom of the liquid storage tank 401, and the connecting frames 403 are fixedly connected to the inner wall of the tank body 2. A drive shaft 405 is longitudinally installed inside the liquid storage tank 401 through a bearing, and the drive shaft 405 passes through the liquid storage tank 401 and extends to the bottom of the liquid storage tank 401. A spiral plate 406 is welded to the side of the drive shaft 405, and an evaporation disk 4 is welded to the side of the drive shaft 405 at the top position of the spiral plate 406. 07, the evaporation plate 407 and the top of the spiral plate 406 are on the same horizontal plane, and a fan-shaped notch is opened in the evaporation plate 407. The top surface of the evaporation plate 407 is provided with a plurality of guide grooves, and the evaporation plate 407 is made of silicon carbide ceramic material. The liquid storage tank 401 can store the solvent to be recycled, so that the solvent can be evaporated by the components inside the liquid storage tank 401, so that the effective components in the solvent are distilled to generate solvent vapor, so as to facilitate the recovery of the solvent. The heating wire 402 can generate heat after being energized, so as to facilitate the liquid storage tank 401 and the solvent inside it. The connecting frame 403 can support the liquid storage tank 401, thereby ensuring the installation stability of the liquid storage tank 401 and its surrounding components. The driving shaft 405 can be driven by the driving motor 306 to rotate, so as to drive the spiral plate 406 and the evaporation disk 407 to rotate. The spiral plate 406 can rotate with the driving shaft 405, so that the solvent inside the liquid storage tank 401 can flow upward and flow to the top of the evaporation disk 407. The spiral plate 406 and the evaporation disk 407 cooperate to expand the evaporation area of ​​the solvent, thereby improving the distillation efficiency of the solvent. Made of silicon carbide ceramic material, the evaporation plate 407 has a higher temperature than the liquid storage tank 401 and other components therein under the same heating method, thereby allowing the solvent on the top of the evaporation plate 407 to be distilled more quickly, while the other components of the solvent are slowly evaporated by the temperature transmitted by the liquid storage tank 401, the spiral plate 406, and the heating wire 402. This facilitates the distillation of multiple components in the solvent through the temperature difference between the different materials, thereby allowing different components in the solvent to be distilled and recovered separately according to actual usage needs, thereby improving the practicality of the device;

[0035] The outer side of the liquid storage tank 401 is fixedly installed with a guide component 3, which includes a heat preservation cover 304, which is fixedly connected to the side wall of the liquid storage tank 401, and a plurality of support shaft frames 301 are fixedly installed on the side of the heat preservation cover 304. A gear ring 302 is installed on the top of the support shaft frame 301, and a guide plate 303 is fixedly installed on the bottom side of the gear ring 302. One side of the guide plate 303 conflicts with the liquid guide platform on the inner side of the condensation cover 209, and a groove is provided on the top of the guide plate 303, and a plurality of longitudinal drainage holes are provided inside the groove, and the drainage holes pass through the top and bottom of the guide plate 303, and a plurality of racks are provided on the top of the gear ring 302. The heat preservation cover 304 is made of silicate. It is made of aluminum material, which can slow down the heat loss inside the liquid storage tank 401, thereby improving the heating efficiency inside the liquid storage tank 401, and can provide an installation position for the support shaft frame 301. A roller is provided on the top of the support shaft frame 301, which contacts the bottom of the gear ring 302 through the roller, so that the gear ring 302 can be supported and easily rotated inside the device. The gear ring 302 can be rotated by the thrust applied by the driving roller 305, and then drive the guide plate 303 to rotate, so as to adjust the position of the guide plate 303, so that the condensed liquid on the inner wall of the condensation hood 209 can fall into different recovery boxes 208 for separate recovery under the guidance of the guide plate 303.

[0036] Furthermore, a motor 404 is fixedly installed at the bottom of the liquid storage tank 401, and the output shaft of the motor 404 is fixedly connected to the drive shaft 405. The motor 404 adopts the YE3-100KW type. The motor 404 can rotate after being energized, thereby driving the drive shaft 405 to rotate.

[0037] Furthermore, a waste pipe 204 is fixedly installed inside the tank body 2, the top end of the waste pipe 204 extends to the bottom surface of the liquid storage tank 401, and the bottom end of the waste pipe 204 passes through the bottom of the tank body 2 and extends out of the tank body 2. The waste pipe 204 can guide the waste solvent inside the liquid storage tank 401 to be discharged from the tank body 2, so that it can be discharged separately from the recovered solvent from two pipes to avoid cross contamination.

[0038] Furthermore, the bottom of the tank body 2 is a conical structure, and a number of support frames 201 are fixedly installed on the bottom of the tank body 2, and a base plate 202 is fixedly installed on the bottom of the support frame 201. The support frame 201 and the base plate 202 can support the tank body 2, thereby ensuring the stability of the tank body 2 and its surrounding components.

[0039] Furthermore, a discharge pipe 203 is fixedly installed at the bottom of the tank body 2, and an electric butterfly valve is fixedly installed at the connection position between the discharge pipe 203 and the tank body 2. The discharge pipe 203 can discharge the recovered solvent so that the recovered solvent can be taken.

[0040] Furthermore, an air pressure detector 102 is fixedly installed on one side of the top of the top cover 1, and the detection end of the air pressure detector 102 passes through the top cover 1 and extends to the interior of the tank body 2. The air pressure detector 102 is made of SUS3O4. The air pressure detector 102 can detect the ambient air pressure value inside the device, thereby cooperating with the vacuum pump 103 to reduce the air pressure value inside the device in the early stage of the device operation, so as to provide a low-pressure environment for the recovery and processing of the solvent.

[0041] Furthermore, a guide tube 206 is fixedly installed at the central position of the heat conductive cover 207 and the condensation cover 209, and the top of the guide tube 206 coincides with the bottom end of the T-shaped tube 101. The guide tube 206 can guide the solvent to fall vertically into the liquid storage tank 401, preventing the solvent from flowing to the top of the heat conductive cover 207.

[0042] Furthermore, several recovery boxes 208 are fixedly installed inside the tank body 2. The recovery boxes 208 are fan-shaped groove structures, and solenoid valves are fixedly installed on the bottom of the recovery boxes 208. A heat dissipation fan 210 is fixedly installed on the side of the tank body 2 above the heat-conducting cover 207. The recovery box 208 can store different solvents, so that after the device recovers solvents of different components, it is convenient to take solvents of different components. The heat dissipation fan 210 adopts the FDL-4C type. The heat dissipation fan 210 can suck the air in the space above the heat-conducting cover 207, so that the heat inside the heat-conducting cover 207 and the heat-conducting rod 205 is discharged, so as to continuously cool the condensation cover 209.

[0043] Furthermore, a driving roller 305 is clamped and installed above the gear ring 302, and a driving motor 306 is fixedly installed on one side of the driving roller 305, and the driving motor 306 is fixedly connected to the inner wall of the condensation hood 209. The driving motor 306 adopts the YE3-10KW model. The driving motor 306 can rotate after being energized, thereby driving the driving roller 305 to rotate, so as to facilitate the control of the gear ring 302 to rotate.

[0044] Working principle: After the device is assembled and checked and confirmed to be correct, connect the T-tube 101 to the external pipeline, close the valve at the top of the T-tube 101, open the other two valves, and use the vacuum pump 103 to suck the air inside the device to reduce the air pressure inside the device. After the low-pressure environment is created, close the valve on the side of the T-tube 101, disconnect the T-tube 101 from the vacuum pump 103, open the valves at the top and bottom of the T-tube 101, and allow the solvent to be injected into the liquid storage tank 401 through the T-tube 101 and the guide tube 206. After the injection is completed, close all the valves of the T-tube 101 to isolate the internal environment of the device from the external environment.

[0045] By energizing the heat-conducting cover 207, a temperature difference is formed in the heat-conducting cover 207 to transfer the heat inside the condensation cover 209. The heat-dissipating fan 210 cools the heat-conducting cover 207 and the heat-conducting rod 205 to keep the temperature of the condensation cover 209 within the range of -10 degrees Celsius to -18 degrees Celsius. After the motor 404 is energized, it rotates, thereby driving the drive shaft 405 and its surrounding components to rotate. The spiral plate 406 drives the solvent inside the liquid storage tank 401 to flow upward, and makes part of the solvent flow to the top of the evaporation disk 407. At the same time, the heating wire 402 generates heat after being energized to heat the liquid storage tank 401 and the solvent and components inside it. The liquid storage tank 401 and the evaporation disk 407 absorb heat respectively to heat the solvent. After that, the solvent is distilled to produce steam. After the steam rises and contacts the condensation hood 209, it is liquefied and falls on the inner wall of the condensation hood 209, and the driving motor 306 drives the driving roller 305 to rotate. The driving roller 305 drives the gear ring 302 to rotate, so that the guide plate 303 moves to the specified position, and contacts the solvent on the inner wall of the condensation hood 209 through the guide plate 303, guiding the solvent to fall into different recovery boxes 208 for separate recovery until the solvent inside the liquid storage tank 401 is completely distilled, and the power supply to the heating wire 402 is stopped, so that the recovered solvent is naturally cooled in the recovery box 208. When taking the solvent, the solenoid valve at the bottom of the recovery box 208 is controlled to discharge the solvent inside the recovery box 208 in turn.

[0046] The above specific embodiments are only several preferred embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A solvent recovery device, comprising a tank body (2), a guide assembly (3) and a separation assembly (4), characterized in that: A condensation hood (209) is fixedly mounted on the inner wall of the tank body (2), the condensation hood (209) is a conical structure, and a circular liquid guide platform is provided at the bottom of the condensation hood (209), a heat-conducting hood (207) is welded to the top of the condensation hood (209), and a plurality of heat-conducting rods (205) are welded to the top of the heat-conducting hood (207); A top cover (1) is mounted on the top of the tank body (2) via bolts, a T-shaped tube (101) is fixedly mounted on the top of the top cover (1), and a vacuum pump (103) is mounted on the side of the T-shaped tube (101) via a hose; A separation assembly (4) is fixedly installed inside the tank body (2), and the separation assembly (4) includes a liquid storage tank (401), a heating wire (402) is installed around the liquid storage tank (401), and a plurality of connecting frames (403) are fixedly installed on the bottom of the liquid storage tank (401), and the connecting frames (403) are fixedly connected to the inner wall of the tank body (2), and a driving shaft (405) is longitudinally installed inside the liquid storage tank (401) through a bearing, and the driving shaft (405) passes through the liquid storage tank (401) and Extending to the bottom of the liquid storage tank (401), a spiral plate (406) is welded to the side of the drive shaft (405), and an evaporation disk (407) is welded to the side of the drive shaft (405) at the top of the spiral plate (406), the evaporation disk (407) and the top of the spiral plate (406) are on the same horizontal plane, and a fan-shaped notch is provided in the evaporation disk (407), and a plurality of guide grooves are provided on the top surface of the evaporation disk (407), and the evaporation disk (407) is made of silicon carbide ceramic material; A guide assembly (3) is fixedly installed on the outside of the liquid storage tank (401), and the guide assembly (3) includes a heat-insulating cover (304), the heat-insulating cover (304) is fixedly connected to the side wall of the liquid storage tank (401), and a plurality of support shaft frames (301) are fixedly installed on the side of the heat-insulating cover (304), a gear ring (302) is installed on the top of the support shaft frame (301), and a guide plate (303) is fixedly installed on one side of the bottom of the gear ring (302), one side of the guide plate (303) is in contact with the liquid guide platform on the inner side of the condensation cover (209), and a groove is provided on the top of the guide plate (303), and a plurality of longitudinally arranged drainage holes are provided inside the groove, and the drainage holes pass through the top and bottom of the guide plate (303), and a plurality of racks are provided on the top of the gear ring (302); A flow guide tube (206) is fixedly installed at the central position of the heat-conducting cover (207) and the condensing cover (209), and the top end of the flow guide tube (206) is aligned with the bottom end of the T-shaped tube (101); Several recovery boxes (208) are fixedly installed inside the tank body (2), the recovery boxes (208) are fan-shaped groove structures, and electromagnetic valves are fixedly installed at the bottom of the recovery boxes (208). A heat dissipation fan (210) is fixedly installed on the side of the tank body (2) at a position above the heat-conducting cover (207); A driving roller (305) is clamped and mounted above the gear ring (302), a driving motor (306) is fixedly mounted on one side of the driving roller (305), and the driving motor (306) is fixedly connected to the inner wall of the condensation cover (209).

2. A solvent recovery device according to claim 1, characterized in that: An electric motor (404) is fixedly mounted on the bottom of the liquid storage tank (401), and an output shaft of the electric motor (404) is fixedly connected to a drive shaft (405).

3. A solvent recovery device according to claim 1, characterized in that: A waste pipe (204) is fixedly installed inside the tank body (2), the top end of the waste pipe (204) extends to the bottom surface inside the liquid storage tank (401), and the bottom end of the waste pipe (204) passes through the bottom of the tank body (2) and extends out of the tank body (2).

4. A solvent recovery device according to claim 1, characterized in that: The bottom of the tank body (2) is a conical structure, and a plurality of support frames (201) are fixedly mounted on the bottom of the tank body (2), and a bottom plate (202) is fixedly mounted on the bottom of the support frames (201).

5. A solvent recovery device according to claim 1, characterized in that: A discharge pipe (203) is fixedly installed at the bottom of the tank body (2), and an electric butterfly valve is fixedly installed at the connection position between the discharge pipe (203) and the tank body (2).

6. A solvent recovery device according to claim 1, characterized in that: An air pressure detector (102) is fixedly mounted on one side of the top of the top cover (1), and a detection end of the air pressure detector (102) passes through the top cover (1) and extends to the interior of the tank body (2).

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