A combined separation device for dewatering and impurity removal of used lubricating oil

Abstract

The application discloses a combined dehydration and impurity removal device for lubricating oil waste oil, which comprises a pretreatment part, a filter structure and a centrifugal separation structure. The pretreatment part comprises a heat insulation tank body, one side of the bottom of the heat insulation tank body is fixedly provided with an oil inlet, the other side of the bottom of the heat insulation tank body is fixedly provided with an oil outlet, the bottom of the heat insulation tank body is fixedly provided with a first drain port, and a floating plate is slidably connected in the heat insulation tank body. The filter structure comprises a filter cartridge, and one side of the upper end of the filter cartridge is in communication with the oil outlet. The centrifugal separation structure comprises an outer barrel, and the side surface of the outer barrel is in communication with the bottom of the filter cartridge. In the application, the waste lubricating oil is heated by the heating pipe disc of the pretreatment part, so that free water is evaporated, and emulsified water is separated and settled, preliminary dehydration is realized, then the oil liquid is filtered by the cloth bag in the filter cartridge to remove solid impurities, and finally enters the centrifugal separation structure, and the selective permeability of the oleophilic and hydrophobic membrane and the centrifugal force are used in the high-speed rotating inner cylinder to further remove residual water and impurities.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil waste oil regeneration technology, specifically a combined separation device for dehydration and impurity removal of lubricating oil waste. Background Technology

[0002] During use, lubricating oil can become contaminated with moisture, mechanical impurities, gums, and oxidation products, leading to a decline in oil performance. Existing methods for dehydrating and removing impurities from waste oil mainly include gravity sedimentation, vacuum dehydration, coalescence separation, and centrifugal separation. However, each method has significant limitations: gravity sedimentation is time-consuming and cannot remove emulsified water; vacuum dehydration equipment has high investment costs and energy consumption; coalescence separation is ineffective for dissolved water; and centrifugal separation is not thorough in removing trace amounts of water. Traditional devices often employ a single technical route, making it difficult to simultaneously and efficiently remove free water, emulsified water, dissolved water, and solid impurities, resulting in unstable quality of recycled oil. Furthermore, existing equipment lacks effective oil surface coverage and insulation structures in the pretreatment stage, leading to easy oxidation of the oil and significant heat loss during heating; filter components are inconvenient to replace; and centrifugal separation structures have limited precision in removing residual water. Summary of the Invention

[0003] The purpose of this invention is to provide a combined separation device for dehydration and impurity removal of waste lubricating oil, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A combined dehydration and impurity removal separation device for waste lubricating oil, comprising: The pretreatment unit includes an insulated tank, an oil inlet fixedly installed on one side of the bottom of the insulated tank, an oil outlet fixedly installed on the other side of the bottom of the insulated tank, a drain outlet fixedly installed at the bottom of the insulated tank, and a float plate slidably engaged inside the insulated tank. A filtration structure includes a filter cartridge, one side of the upper end of which is connected to an oil outlet. The centrifugal separation structure includes an outer barrel, the upper edge of the side surface of the outer barrel being in communication with the bottom of the filter cartridge.

[0005] Furthermore, the oil inlet is connected to the oil pump via an electric valve, a waste outlet is provided at the bottom of the insulated tank, the waste outlet is sealed and fixedly installed to the tank bottom via a flange, the first drain outlet is fixedly installed at the bottom of the tank bottom, and the first drain outlet is fixedly connected to an electric valve via a flange.

[0006] Furthermore, a heat-conducting inner liner is fixedly installed on the inner wall of the heat-insulating tank, and a heating coil is embedded in the interlayer between the heat-insulating tank and the heat-conducting inner liner.

[0007] Furthermore, the following features are provided: a limiting strip is fixedly installed on the inner wall of the heat-conducting inner liner, a limiting end is fixedly installed at the bottom of the limiting strip, the side surface of the float plate is slidably engaged with the limiting strip, a limiting top frame is fixedly installed on the inner wall of the upper opening of the heat-insulating tank body by means of angle brackets and bolts, a reinforcing frame is fixedly installed on the inner surface of the limiting top frame, a support frame is fixedly installed on the upper middle part of the reinforcing frame, a rail is fixedly installed on the upper middle part of the float plate, the rail is slidably engaged with the upper end of the support frame, and a return spring is sleeved on the side surface of the rail.

[0008] Furthermore, the upper side surface of the filter cartridge is connected to the oil outlet via an electric valve, a cartridge cover is hinged at the upper opening of the filter cartridge, a latch is hinged at the upper edge of the filter cartridge, a bag frame is fitted inside the upper opening of the filter cartridge, a cloth bag is fitted inside the filter cartridge, and the upper opening of the cloth bag is fixedly connected to the bag frame.

[0009] Furthermore, the outer barrel has a lid attached to its opening, an exhaust port is fixedly installed on the upper side of the lid, an air valve is fixedly installed in the middle of the exhaust port, and an inner barrel opening is fixedly installed on the inner wall of the outer barrel opening.

[0010] Furthermore, an inner cylinder is rotatably installed at the bottom of the inner barrel opening, an oil inlet channel is fixedly installed on the side surface of the inner cylinder, the outer end of the oil inlet channel is fixedly connected to the inner wall of the rotating ring, a fixed ring is rotatably installed on the outer side of the rotating ring through a sealed bearing, a guide groove is provided between the rotating ring and the fixed ring, an oil injection port is fixedly installed on the upper edge of the side surface of the outer barrel, the oil injection port is interconnected with the bottom of the filter cartridge, and the oil injection port is interconnected with the guide groove.

[0011] Furthermore, an external toothed ring is fixedly sleeved on the lower edge of the inner cylinder side surface, a drive motor is fixedly installed on the outer side of the outer cylinder, a gear is fixedly installed on the output end of the drive motor, the gear meshes with the external toothed ring, a partition is rotatably connected to the lower edge of the inner cylinder through a sealed bearing, the partition is fixedly connected to the inner wall of the outer cylinder, a mesh cylinder is fixedly installed at the bottom of the inner cylinder, an oleophilic and hydrophobic membrane is fixedly attached to the inner wall of the mesh cylinder, an oil drain port is fixedly installed on the bottom edge of the outer cylinder, the bottom of the mesh cylinder is rotatably connected to the inner bottom of the outer cylinder, and a second drain port is fixedly installed in the middle of the bottom side of the outer cylinder.

[0012] Compared with the prior art, the beneficial effects of the present invention are: Waste lubricating oil is first heated by the heating coil in the pretreatment section, causing free water to evaporate and emulsified water to settle and separate, achieving preliminary dehydration. The initially dehydrated oil is then filtered through a filter bag inside the filter cartridge to remove solid impurities. The filtered oil then enters a centrifugal separation structure, where the selective permeability of the oleophilic-hydrophobic membrane and centrifugal force work together in a high-speed rotating inner cylinder to further remove residual trace amounts of water and ultrafine impurities. This three-stage progressive treatment process gradually improves the cleanliness of the oil, avoiding the limitations of single-treatment methods that cannot simultaneously achieve both dehydration precision and impurity removal efficiency, significantly improving the quality indicators and recycling rate of the recycled lubricating oil.

[0013] The float plate inside the insulated tank slides adaptively along the limit strip as the oil level rises and falls, covering the oil surface to reduce the contact area with air, thereby reducing oil oxidation and heat loss during the heating process. The return spring provides elastic buffering to prevent rigid collisions and ensure the stability of the float plate's movement. The filter cartridge adopts a bag frame clamping and cylinder cover hinge structure, allowing for quick opening and replacement of the filter bag after it accumulates dirt. The bottom of the tank is sealed to the waste discharge port via a flange, facilitating disassembly and cleaning of the bottom sludge. The modular design of each functional module significantly reduces the difficulty of equipment maintenance and downtime. The sandwich insulation structure of the insulated tank, combined with the float plate coverage, further reduces heating energy consumption and improves the economy and reliability of equipment operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the pretreatment section in this invention; Figure 3 This is a schematic diagram of the pretreatment section in this invention; Figure 4 This is a schematic diagram of the filter structure in this invention; Figure 5 This is a schematic diagram of the centrifugal separation structure in this invention; Figure 6 This is a schematic diagram of the centrifugal separation structure in this invention.

[0015] In the diagram: 1. Pretreatment section; 101. Insulated tank; 102. Electric valve; 103. Oil inlet; 104. Oil outlet; 105. Drainage outlet No. 1; 106. Oil pump; 107. Heat-conducting inner tank; 108. Heating coil; 109. Limiting strip; 110. Float; 111. Limiting top frame; 112. Reinforcing frame; 113. Support frame; 114. Rail; 115. Return spring; 116. Waste outlet; 117. Tank bottom; 2. Filtration structure; 201. Filter cartridge; 202. Cover; 203. Lock 204. Buckle; 205. Bag; 3. Centrifugal separation structure; 301. Outer barrel; 302. Barrel lid; 303. Exhaust port; 304. Air valve; 305. Inner barrel opening; 306. Inner cylinder; 307. Oil inlet channel; 308. Rotary ring; 309. Fixed ring; 310. Guide groove; 311. Oil inlet; 312. External gear ring; 313. Gear; 314. Drive motor; 315. Partition plate; 316. Mesh cylinder; 317. Oleophilic and hydrophobic membrane; 318. Oil outlet; 319. Second drain outlet. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1-6 In this embodiment of the invention, a combined separation device for dehydrating and removing impurities from waste lubricating oil includes a pretreatment section 1, a filtration structure 2, and a centrifugal separation structure 3. The pretreatment section 1 includes an insulated tank 101, with an oil inlet 103 fixedly installed on one side of the bottom of the insulated tank 101, an oil outlet 104 fixedly installed on the other side of the bottom of the insulated tank 101, and a drain outlet 105 fixedly installed at the bottom of the insulated tank 101. A float plate 110 is slidably engaged inside the insulated tank 101. The filtration structure 2 includes a filter cylinder 201, with one side of the upper end of the filter cylinder 201 communicating with the oil outlet 104. The centrifugal separation structure 3 includes an outer barrel 301, with the upper edge of the side surface of the outer barrel 301 communicating with the bottom of the filter cylinder 201.

[0018] Specifically, waste lubricating oil is pumped into the insulated tank 101 through the oil inlet 103. The heating coil 108 heats the waste oil, causing the water in the oil-water mixture to evaporate and float or settle and separate. The float 110 adjusts adaptively with the rise and fall of the oil level. The oil after preliminary dehydration enters the filter cartridge 201 through the oil outlet 104 and is filtered by the cloth bag 205 to remove solid impurities. The filtered oil enters the outer tank 301, and the drive motor 314 drives the inner tank 306 to rotate at high speed. The centrifugal separation effect of the oleophilic and hydrophobic membrane 317 is used to further remove residual trace water and fine impurities, realizing a three-stage combined treatment of waste lubricating oil: heating and dehydration, coarse filtration and centrifugal fine separation, thereby improving the quality and recovery rate of recycled lubricating oil. Example 1

[0019] like Figure 1-3 As shown, in this embodiment, the oil inlet 103 is connected to the oil pump 106 via an electric valve 102. The bottom of the heat-insulated tank 101 is provided with a waste outlet 116. The waste outlet 116 is sealed and fixedly installed with the tank bottom 117 via a flange. The first drain outlet 105 is fixedly installed at the bottom of the tank bottom 117. The first drain outlet 105 is fixedly connected to the electric valve 102 via a flange. A heat-conducting inner liner 107 is fixedly installed on the inner wall of the heat-insulated tank 101. A heating coil 108 is embedded in the interlayer between the heat-insulated tank 101 and the heat-conducting inner liner 107.

[0020] In this embodiment, the oil pump 106 pumps the waste lubricating oil to be treated into the insulated tank 101 through the oil inlet 103. The heating coil 108 is activated, and heat is evenly transferred to the waste oil through the heat-conducting inner liner 107, raising the oil temperature to the set temperature. During the heating process, the free water in the waste oil evaporates and forms water vapor that escapes upward. Some of the emulsified water settles and separates due to the density difference and the decrease in oil viscosity. The jacketed insulation structure of the insulated tank 101 reduces heat loss and energy consumption. After heating is completed, the wastewater containing impurities deposited at the bottom of the tank 117 is discharged through the first drain outlet 105. The bottom of the tank 117 is sealed to the waste outlet 116 through a flange, which facilitates disassembly and cleaning of the sludge and impurities deposited at the bottom. The electric valve 102 at the oil outlet 104 controls the oil after preliminary dehydration to enter the next stage of the filtration structure 2.

[0021] like Figure 1-3 As shown, in this embodiment, a limiting strip 109 is fixedly installed on the inner wall of the heat-conducting inner liner 107, and a limiting end is fixedly installed at the bottom of the limiting strip 109. The side surface of the float 110 is slidably engaged with the limiting strip 109. A limiting top frame 111 is fixedly installed on the inner wall of the upper opening of the heat-insulating tank 101 by means of angle brackets and bolts. A reinforcing frame 112 is fixedly installed on the inner surface of the limiting top frame 111. A support frame 113 is fixedly installed on the upper middle part of the reinforcing frame 112. A rail rod 114 is fixedly installed on the upper middle part of the float 110. The rail rod 114 is slidably engaged with the upper end of the support frame 113. A return spring 115 is sleeved on the side surface of the rail rod 114.

[0022] In practice, the float 110 floats on the surface of the oil and slides up and down along the limiting strip 109 as the oil level rises and falls. The limiting strip 109 circumferentially limits the float 110 to prevent it from rotating or shifting. The limiting end at the bottom of the limiting strip 109 lowers the float 110 to prevent it from falling off when the oil is drained. The rail 114 on the upper side of the float 110 slides and engages with the upper end of the support frame 113 to guide the lifting and lowering movement of the float 110. The return spring 115 is sleeved on the side surface of the rail 114 to provide elastic buffer when the float 110 rises, preventing the float 110 from rigidly colliding with the limiting top frame 111. The reinforcing frame 112 and the limiting top frame 111 enhance the structural strength of the support frame 113 and ensure the stability of the float 110's movement. The float 110 covers the surface of the oil, reducing the contact area between the oil surface and the air, reducing oil oxidation during the heating process, and preventing external dust from falling into the oil. Example 2

[0023] Based on Example 1, this paper supplements the specific methods of filtration and centrifugal separation that were not mentioned in Example 1.

[0024] like Figure 1-6 As shown, in this embodiment, the upper side surface of the filter cartridge 201 is connected to the oil outlet 104 via an electric valve 102. A cartridge cover 202 is hinged to the upper opening of the filter cartridge 201, and a latch 203 is hinged to the upper edge of the filter cartridge 201. A bag frame 204 is fitted inside the upper opening of the filter cartridge 201, and a cloth bag 205 is fitted inside the filter cartridge 201. The upper opening of the cloth bag 205 is fixedly connected to the bag frame 204. A barrel cover 302 is fitted to the upper opening of the outer barrel 301, and an exhaust port 303 is fixedly installed on the upper side of the barrel cover 302. An air valve 304 is fixedly installed in the middle of the exhaust port 303, and an inner barrel opening 305 is fixedly installed on the inner wall of the upper opening of the outer barrel 301.

[0025] An inner cylinder 306 is rotatably mounted at the bottom of the inner cylinder 305. An oil inlet channel 307 is fixedly mounted on the side surface of the inner cylinder 306. The outer end of the oil inlet channel 307 is fixedly connected to the inner wall of the rotating ring 308. A fixed ring 309 is rotatably mounted on the outer side of the rotating ring 308 through a sealed bearing. A guide groove 310 is provided between the rotating ring 308 and the fixed ring 309. An oil inlet 311 is fixedly mounted on the upper edge of the side surface of the outer cylinder 301. The oil inlet 311 is interconnected with the bottom of the filter cartridge 201 and with the guide groove 310. An external toothed ring 312 is fixedly sleeved on the lower edge of the side surface of the inner cylinder 306. A drive motor 314 is fixedly installed on the outer side, and a gear 313 is fixedly installed at the output end of the drive motor 314. The gear 313 meshes with the external gear ring 312. A partition 315 is rotatably connected to the lower edge of the inner cylinder 306 through a sealed bearing. The partition 315 is fixedly connected to the inner wall of the outer cylinder 301. A mesh cylinder 316 is fixedly installed at the bottom of the inner cylinder 306. An oleophilic and hydrophobic membrane 317 is fixedly attached to the inner wall of the mesh cylinder 316. An oil drain port 318 is fixedly installed at the bottom edge of the outer cylinder 301. The bottom of the mesh cylinder 316 is rotatably connected to the inner bottom of the outer cylinder 301. A second drain port 319 is fixedly installed at the middle of the bottom side of the outer cylinder 301. In practice, the oil after preliminary dehydration enters the filter cartridge 201 through the oil outlet 104, passes through the filter cloth of the filter bag 205 inside the filter cartridge 201, and solid impurities are trapped inside the filter bag 205. The clean oil passes through the filter cloth and enters the bottom of the filter cartridge 201. When too much impurity accumulates in the filter bag 205, causing the filtration resistance to increase, the lock 203 is opened, the cartridge cover 202 is opened, and the bag frame 204 and filter bag 205 are taken out for cleaning or replacement, making maintenance convenient.

[0026] The filtered oil enters the guide groove 310 between the fixed ring 309 and the rotating ring 308 from the bottom of the filter cylinder 201 through the oil inlet 311, and then enters the high-speed rotating inner cylinder 306 through the oil inlet channel 307. The drive motor 314 is started, and the drive gear 313 meshes with the outer gear ring 312, driving the inner cylinder 306 and the screen cylinder 316 to rotate at high speed. Under the action of centrifugal force, the oil passes through the oleophilic and hydrophobic membrane 317 on the wall of the filter screen cylinder 316. Because the oleophilic and hydrophobic membrane 317 has an affinity for the oil phase and a repulsive barrier to the water phase, the oil passes through the filter membrane and is discharged through the oil outlet 318 at the bottom edge of the outer cylinder 301. Trace amounts of moisture and ultrafine impurities are trapped inside the mesh cylinder 316 and gather towards the center under centrifugal force. Finally, they are discharged through the second drain outlet 319 after converging at the bottom of the mesh cylinder 316. The partition 315 divides the interior of the outer barrel 301 into upper and lower chambers to prevent the separated oil and water from mixing again. The exhaust port 303 and air valve 304 on the barrel cover 302 are used to discharge the gas generated during the separation process and maintain the pressure balance inside the outer barrel 301. This centrifugal fine separation structure utilizes the selective permeability of the oleophilic and hydrophobic membrane 317 and the synergistic effect of centrifugal force to achieve efficient separation of oil and water, significantly improving the dehydration precision and quality of the regenerated lubricating oil.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A combined dehydration and impurity removal separation device for waste lubricating oil, characterized in that, include: The pretreatment unit (1) includes an insulated tank (101), an oil inlet (103) is fixedly installed on one side of the bottom of the insulated tank (101), an oil outlet (104) is fixedly installed on the other side of the bottom of the insulated tank (101), a drain outlet (105) is fixedly installed at the bottom of the insulated tank (101), and a float plate (110) is slidably engaged inside the insulated tank (101). The filter structure (2) includes a filter cartridge (201), one side of the upper end of the filter cartridge (201) being connected to the oil outlet (104); The centrifugal separation structure (3) includes an outer barrel (301), the upper edge of the side surface of the outer barrel (301) being connected to the bottom of the filter cartridge (201).

2. The combined separation device for dehydration and impurity removal of waste lubricating oil according to claim 1, characterized in that, The oil inlet (103) is connected to the oil pump (106) via an electric valve (102). The bottom of the heat-insulated tank (101) is provided with a waste outlet (116). The waste outlet (116) is sealed and fixedly installed with the tank bottom (117) via a flange. The first drain outlet (105) is fixedly installed at the bottom of the tank bottom (117). The first drain outlet (105) is fixedly connected to the electric valve (102) via a flange.

3. The combined separation device for dehydration and impurity removal of waste lubricating oil according to claim 2, characterized in that, A heat-conducting inner liner (107) is fixedly installed on the inner wall of the heat-insulating tank (101), and a heating coil (108) is embedded in the interlayer between the heat-insulating tank (101) and the heat-conducting inner liner (107).

4. The combined separation device for dehydration and impurity removal of waste lubricating oil according to claim 3, characterized in that, The inner wall of the heat-conducting inner liner (107) is fixedly installed with a limiting strip (109), and the bottom of the limiting strip (109) is fixedly installed with a limiting end. The side surface of the float (110) is slidably engaged with the limiting strip (109). The inner wall of the upper opening of the heat-insulating tank (101) is fixedly installed with a limiting top frame (111) by angle brackets and bolts. The inner surface of the limiting top frame (111) is fixedly installed with a reinforcing frame (112). The upper middle part of the reinforcing frame (112) is fixedly installed with a support frame (113). The upper middle part of the float (110) is fixedly installed with a rail rod (114). The rail rod (114) is slidably engaged with the upper end of the support frame (113). The side surface of the rail rod (114) is sleeved with a return spring (115).

5. A combined separation device for dehydration and impurity removal of waste lubricating oil according to claim 4, characterized in that, The upper side surface of the filter cartridge (201) is connected to the oil outlet (104) through an electric valve (102). A cartridge cover (202) is hinged to the upper opening of the filter cartridge (201). A latch (203) is hinged to the upper edge of the filter cartridge (201). A bag frame (204) is installed inside the upper opening of the filter cartridge (201). A cloth bag (205) is sleeved inside the filter cartridge (201). The upper opening of the cloth bag (205) is fixedly connected to the bag frame (204).

6. A combined separation device for dehydration and impurity removal of waste lubricating oil according to claim 5, characterized in that, The outer barrel (301) has an opening with a barrel lid (302) attached to it. An exhaust port (303) is fixedly installed on the upper side of the barrel lid (302). An air valve (304) is fixedly installed in the middle of the exhaust port (303). An inner barrel opening (305) is fixedly installed on the inner wall of the opening of the outer barrel (301).

7. A combined separation device for dehydration and impurity removal of waste lubricating oil according to claim 6, characterized in that, An inner cylinder (306) is rotatably installed at the bottom of the inner barrel opening (305). An oil inlet channel (307) is fixedly installed on the side surface of the inner cylinder (306). The outer end of the oil inlet channel (307) is fixedly connected to the inner wall of the rotating ring (308). A fixed ring (309) is rotatably installed on the outer side of the rotating ring (308) through a sealed bearing. A guide groove (310) is provided between the rotating ring (308) and the fixed ring (309). An oil inlet (311) is fixedly installed on the upper edge of the side surface of the outer barrel (301). The oil inlet (311) is connected to the bottom of the filter cartridge (201). The oil inlet (311) is connected to the guide groove (310).

8. A combined separation device for dehydration and impurity removal of waste lubricating oil according to claim 7, characterized in that, An external gear ring (312) is fixedly sleeved on the lower edge of the side surface of the inner cylinder (306). A drive motor (314) is fixedly installed on the outer side of the outer barrel (301). A gear (313) is fixedly installed at the output end of the drive motor (314). The gear (313) meshes with the external gear ring (312). A partition (315) is rotatably connected to the lower edge of the inner cylinder (306) through a sealed bearing. The partition (315) is fixedly connected to the inner wall of the outer barrel (301). A mesh cylinder (316) is fixedly installed at the bottom of the inner cylinder (306). An oleophilic and hydrophobic membrane (317) is fixedly attached to the inner wall of the mesh cylinder (316). An oil drain port (318) is fixedly installed at the bottom edge of the outer barrel (301). The bottom of the mesh cylinder (316) is rotatably connected to the inner bottom of the outer barrel (301). A second drain port (319) is fixedly installed in the middle of the bottom side of the outer barrel (301).

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