A low-temperature pressing tea oil preparation deacidification device

Abstract

The present application relates to a kind of deacidification devices, especially a kind of low-temperature pressing tea oil preparation is used deacidification device, including tower body, the top side of the tower body is communicated with negative pressure pipe, it is connected with external negative pressure equipment, the top middle of the tower body is communicated with oil inlet pipe, multiple fixed rings one are fixed in the tower body from top to bottom, each described fixed ring one is provided with packing block, the lower side of the tower body is fixed with oil guide funnel, it is fixed with vapor spray frame in, the bottom middle of the vapor spray frame is fixed with oil outlet pipe, drainage channel is formed between the outer wall of the oil guide funnel and the inner wall of the tower body, the bottom of the tower body is fixed with drain pipe.The present application is guided to oil guide funnel and annular drainage channel design, condensate is separately guided to independent storage path, can effectively prevent condensate mixed into final product oil, guarantees the purity, clarity and storage stability of tea oil, avoids the occurrence of emulsification phenomenon.

Description

Technical Field

[0001] This invention relates to a deacidification device, and more particularly to a deacidification device for the preparation of low-temperature pressed tea oil. Background Technology

[0002] Camellia oil, as a high-quality edible vegetable oil, is rich in various natural active nutrients. Low-temperature pressing, because it preserves the color, flavor, and nutrients of camellia oil to the greatest extent without causing thermal oxidation and deterioration, has become the mainstream method for producing high-end camellia oil. In the low-temperature pressing production process, to optimize the physical state of the camellia seeds, improve oil fluidity, and increase oil yield, pretreatment of the crude oil is usually required, with deacidification being a key step. Traditional chemical deacidification methods require the addition of alkali to neutralize free fatty acids, but this generates a large amount of soapstock waste, easily leading to oil emulsification, increased loss rates, and complex subsequent washing. Physical deacidification (steam distillation deacidification), on the other hand, utilizes the principle that water vapor bubbles in a high-temperature vacuum environment carry away volatile free fatty acids and odor substances, achieving green separation without the intervention of chemical reagents. This is particularly suitable for low-temperature pressed camellia oil where extremely high purity is required.

[0003] However, existing physical deacidification devices have significant technical flaws in actual operation. First, although the core area of ​​the tower maintains a high temperature and high vacuum to facilitate fatty acid volatilization, the temperature of the upper part and side walls of the tower is often lower than the dew point of water vapor due to heat dissipation or insulation dead zones. When the introduced high-temperature superheated steam comes into contact with the relatively cool tower wall during its ascent, it is very easy for phase change condensation to occur, forming liquid water. Existing equipment lacks an effective oil-water separation and flow guiding structure, so this condensate cannot be discharged in time, but flows down the tower wall and mixes with the downward-flowing deacidified oil. The mixing of condensate not only significantly reduces the purity and clarity of the tea oil, but also easily causes oil emulsification, leading to decreased storage stability and even bacterial growth that affects food safety.

[0004] Secondly, existing steam supply systems mostly employ open-loop control or simple timed switching strategies, lacking intelligent feedback mechanisms based on actual operating conditions. Especially when ambient temperature fluctuations or disruptions in the tower's thermal balance lead to "low-temperature" conditions (such as during startup, shutdown cooling, or abnormal condensation due to localized overheating), excessive water vapor entering the tower cannot effectively participate in the mass transfer process, instead exacerbating condensate formation. This excess condensate continuously mixes into the system, altering the thermodynamic environment of the materials, not only diluting the oil-gas partial pressure and reducing deacidification efficiency, but also potentially causing excessive moisture content in the effluent.

[0005] Therefore, there is an urgent need for a deacidification device for the preparation of low-temperature pressed tea oil that can automatically detect the accumulation of condensate and control the steam reflux, while also having a high-efficiency oil-water separation function. Summary of the Invention

[0006] In order to overcome the shortcomings mentioned in the background art, the present invention provides a deacidification device for the preparation of low-temperature pressed tea oil.

[0007] A deacidification device for low-temperature pressed tea oil preparation includes a tower body. A negative pressure pipe is connected to the top side of the tower body and is connected to an external negative pressure device. An oil inlet pipe is connected to the middle of the top of the tower body. Multiple fixing rings are fixedly connected from top to bottom inside the tower body. Each fixing ring is equipped with a packing block. An oil guide funnel is fixedly connected to the lower side of the tower body, and a steam spray frame is fixedly connected inside the funnel. An oil outlet pipe is fixedly connected to the middle of the bottom of the steam spray frame. A drainage channel is formed between the outer wall of the oil guide funnel and the inner wall of the tower body. A drain pipe is fixedly connected to the bottom of the tower body and is connected to the drainage channel. The end of the drain pipe is fixedly connected to a storage cylinder. A reflux mechanism is provided on the oil outlet pipe to automatically realize steam reflux at low temperatures and stop the steam from being supplied to the tower body.

[0008] In one embodiment, the steam spray frame consists of a ring and multiple circumferentially distributed branch nozzles fixed thereon. The oil guide funnel and the oil outlet pipe are connected through the ring. Each branch nozzle has multiple equally spaced spray nozzles. The ring has an air inlet for inputting high-temperature steam.

[0009] In one embodiment, the reflux mechanism includes a connecting frame fixed to the outer wall of the oil outlet pipe. An air inlet pipe and a reflux pipe are fixed to the connecting frame. A fixed cylinder is connected between the air inlet pipe and the reflux pipe. A steam pipe is connected between the fixed cylinder and the air inlet. A switching valve is slidably connected inside the fixed cylinder to control the output of high-temperature steam through either the steam pipe or the reflux pipe. A connecting rod is slidably connected to the fixed cylinder and fixed to the switching valve. A drive assembly is provided on the drain pipe to automatically drive the connecting rod to move downward at low temperatures.

[0010] In one embodiment, the switching valve has a channel one and a channel two, wherein the channel one is used to connect the steam pipe and the air inlet pipe, and the channel two is used to connect the air inlet pipe and the return pipe.

[0011] In one embodiment, both the connecting sleeve and the fixing cylinder are made of transparent material.

[0012] In one embodiment, the drive assembly includes a limiting ring fixedly connected to the drain pipe. A second fixed ring is fixedly connected to the drain pipe. A circumferentially distributed telescopic rod is fixedly connected to the second fixed ring. A movable valve is fixedly connected between each telescopic rod. The movable valve moves downward and contacts the limiting ring. A valve port 1 is opened on the lower side of the movable valve, and a valve port 2 is opened at the bottom of the movable valve, located above the limiting ring. When the movable valve contacts the limiting ring downward, the limiting ring blocks the valve port 2. A connecting pipe is connected to the side of the drain pipe near the valve port 1. Initially, it is misaligned with the valve port 1. The connecting pipe is fixedly connected to the connecting sleeve, and the two are interconnected. A lifting cylinder is slidably connected inside the connecting sleeve. The connecting pipe is used to guide water from the movable valve into the lifting cylinder. The connecting rod is fixedly connected to the bottom wall of the lifting cylinder. The bottom end of the lifting cylinder extends downward from the connecting sleeve and closes the port through a cap.

[0013] In one embodiment, a magnetic ring is also included, which is fixed to the bottom of the connecting sleeve. The lifting cylinder is magnetically attracted to the magnetic ring, and a spring is fixed between the lifting cylinder and the connecting sleeve.

[0014] In one embodiment, the system further includes a mounting base fixed to the outer wall of the tower body. A motor is fixed to the mounting base, and a drive wheel is fixed to the output shaft of the motor. A driven wheel is rotatably connected to the top of the tower body, and the drive wheel and the driven wheel are in frictional engagement. A magnet 1 is fixed to the driven wheel and symmetrically distributed along it. A flow divider is rotatably connected to the lower end of the oil inlet pipe. The flow divider is located inside the tower body, and a magnet 2 is fixed to the flow divider. The magnet 1 engages with the magnet 2 through magnetic attraction.

[0015] In one embodiment, the flow divider includes flow divider pipes symmetrically distributed thereal, the flow divider pipes communicating with the flow divider, and an oil outlet is opened in the middle of the bottom of the flow divider.

[0016] The present invention has the following advantages: First, through the unique design of the oil guiding funnel and the annular drainage channel, the condensate is guided to an independent storage path, which can effectively prevent the condensate from mixing into the final finished oil, ensuring the purity, clarity and storage stability of the tea oil, and avoiding the occurrence of emulsification.

[0017] Secondly, by using lever amplification structures such as moving valves and lifting cylinders, an automatic steam backflow cut-off mechanism based on liquid level sensing is created. This transforms the accumulation of tiny amounts of condensate into significant mechanical displacement, thereby controlling the on / off state of the switching valve. Under low temperature or abnormally high humidity conditions, the steam input is automatically stopped, preventing ineffective steam from exacerbating condensation and oil-water mixing.

[0018] Furthermore, by timely cutting off the steam supply at low temperatures, a suitable temperature gradient and vacuum environment were maintained within the tower, ensuring that free fatty acids volatilized under optimal conditions. This optimized heat and mass transfer efficiency and guaranteed the quality of the deacidified product. Simultaneously, it avoided the waste of heat capacity and operational fluctuations caused by excessive moisture, making the deacidification process more stable and controllable, improving the recovery rate of crude fatty acids and the yield of finished oil, and reducing the burden on subsequent refining.

[0019] Finally, the use of transparent connecting sleeves and fixing cylinders allows operators to intuitively judge the working status of the equipment, such as valve position and water level, which greatly reduces the difficulty of troubleshooting. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the components of the present invention, including the oil inlet pipe, the retaining ring, and the packing block.

[0023] Figure 4 This is a three-dimensional structural diagram of the components of the present invention, such as the fixing ring, telescopic rod, and movable valve.

[0024] Figure 5 This is a three-dimensional structural diagram of the connecting sleeve, lifting cylinder, and magnetic ring of the present invention.

[0025] Figure 6 This is a three-dimensional structural diagram of the lifting cylinder, magnetic ring, and spring components of the present invention.

[0026] Figure 7 This is a three-dimensional structural diagram of the components of the present invention, including the motor, the driving wheel, and the driven wheel.

[0027] Figure 8 This is a three-dimensional structural diagram of the oil inlet pipe and the flow divider of the present invention.

[0028] The markings in the attached diagram are as follows: 1: Tower body, 2: Negative pressure pipe, 3: Oil inlet pipe, 4: Fixing ring one, 5: Packing block, 6: Oil outlet pipe, 7: Steam spray frame, 71: Spray nozzle, 72: Air inlet, 8: Drain pipe, 81: Oil guide funnel, 82: Drainage channel, 9: Storage cylinder, 10: Restriction ring, 11: Fixing ring two, 12: Telescopic rod, 13: Moving valve, 131: Valve port one, 132: Valve port two, 133: Connecting pipe, 14: Steam pipe. 15: Connecting sleeve, 16: Lifting cylinder, 17: Magnetic ring, 18: Spring, 19: Cap, 20: Connecting rod, 21: Connecting frame, 22: Fixed cylinder, 23: Air inlet pipe, 24: Return pipe, 25: Switching valve, 251: Channel 1, 252: Channel 2, 26: Mounting base, 27: Motor, 28: Drive wheel, 29: Driven wheel, 30: Magnet 1, 31: Magnet 2, 32: Diverter frame, 321: Diverter pipe, 322: Oil outlet. Detailed Implementation

[0029] The preferred technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Example 1: A deacidification device for low-temperature pressed tea oil preparation, which mainly includes a tower body 1, a negative pressure system, an oil supply system, a packing layer, a steam distribution system, an oil-water separation system, and a reflux system. Figure 1 and Figure 2 As shown, the tower body 1 serves as the main reaction vessel, with a negative pressure pipe 2 connected to its top side. This negative pressure pipe 2 is connected to external negative pressure equipment such as a vacuum pump to establish a high vacuum environment inside the tower body 1, thereby lowering the boiling point of the oil and free fatty acids. An oil inlet pipe 3 is connected to the middle of the top of the tower body 1 for introducing the crude oil to be treated.

[0031] like Figure 3As shown, to achieve efficient mass transfer through countercurrent gas-liquid contact, three fixed rings 4 are uniformly fixed from top to bottom inside the tower body 1, and each fixed ring 4 is equipped with a packing block 5. These packing blocks 5 are usually corrugated plate packing or mesh packing, which can effectively disperse the downward-flowing crude oil into a thin liquid film, increasing the gas-liquid contact area. On the lower side inside the tower body 1, an oil guide funnel 81 is fixedly attached. This funnel is inverted conical in shape, converging at the center. A steam spray frame 7 is fixedly attached inside the oil guide funnel 81. This steam spray frame 7 is the core component for steam distribution, and an oil outlet pipe 6 is fixedly attached to the middle of its bottom for discharging the purified oil after deacidification treatment outside the tower. It is worth noting that, to prevent condensate from mixing into the final finished oil and to ensure the purity, clarity, and storage stability of the tea oil, a gap is left between the outer wall of the oil guide funnel 81 and the inner wall of the tower body 1, forming an inverted conical drainage channel 82 to separate the tea oil and condensate. A drain pipe 8 is fixedly connected to one side of the bottom of the tower body 1. The drain pipe 8 is connected to the aforementioned drain channel 82, and the end of the drain pipe 8 extends to the outside of the tower body 1 and is fixedly connected to a transparent storage cylinder 9. Condensate is introduced into the drain pipe 8 along the drain channel 82 and then into the storage cylinder 9 for separate storage. In this way, the condensate is guided to an independent storage path, which facilitates the collection of the small amount of condensate discharged, and realizes the separate collection of oil and water.

[0032] like Figures 3 to 6 As shown, to address the issue of significant water vapor condensation under low-temperature conditions, this embodiment incorporates a reflux mechanism, including a steam pipe 14, a connecting rod 20, a connecting frame 21, a fixed cylinder 22, an inlet pipe 23, a reflux pipe 24, a switching valve 25, and a drive assembly. The connecting frame 21 is fixed to the outer wall of the oil outlet pipe 6 for support. Both the inlet pipe 23 and the reflux pipe 24 are fixed to the connecting frame 21 via flanges or welding. The transparent fixed cylinder 22 is vertically positioned, with its upper and lower sides connected to the reflux pipe 24 and the inlet pipe 23, respectively, serving to switch the pipeline. A steam pipe 14 connects the fixed cylinder 22 to the inlet port 72. Inside the fixed cylinder 22, a switching valve 25 is slidably connected in the vertical direction. This switching valve 25 controls whether the high-temperature steam flows from the inlet pipe 23 to the steam pipe 14 (entering the tower) or to the reflux pipe 24 (not entering the tower). A connecting rod 20 is fixed to the bottom end of the switching valve 25, and the connecting rod 20 extends downward through the bottom of the fixed cylinder 22.

[0033] A drive assembly is installed on the drain pipe 8 to automatically drive the connecting rod 20 downwards based on the amount of condensate accumulated under low-temperature conditions. Specifically, the drive assembly includes a limiting ring 10, a second fixed ring 11, telescopic rods 12, a moving valve 13, a connecting pipe 133, a connecting sleeve 15, a lifting cylinder 16, and a cap 19. The limiting ring 10 is fixed inside the drain pipe 8, serving as a limit. A second fixed ring 11 is fixed to the inner wall of the drain pipe 8, and three telescopic rods 12 are fixed to the second fixed ring 11 along the circumferential direction. A hollow cylindrical moving valve 13 is fixed to the lower end of the telescopic rods 12. The moving valve 13 can slide up and down under the restriction of the telescopic rods 12. The moving valve 13 has a valve port 131 on its lower side and a valve port 132 on its bottom. The connecting pipe 133 is connected to the side of the drain pipe 8 near the valve port 131. In the initial state, the movable valve 13 is positioned a distance above the limiting ring 10, with valve port 132 pointing downwards, allowing water to flow out; while valve port 131 is misaligned and not connected to the outer connecting pipe 133. The movable valve 13 moves downwards and contacts the limiting ring 10, at which point the limiting ring 10 blocks valve port 132. A transparent connecting sleeve 15 is fixedly connected to the lower end of the connecting pipe 133, and the two are interconnected. A lifting cylinder 16 is slidably connected inside the connecting sleeve 15. The connecting pipe 133 is used to guide water from the movable valve 13 into the lifting cylinder 16. The connecting rod 20 is fixedly connected to the bottom wall of the lifting cylinder 16. The bottom end of the lifting cylinder 16 extends downwards from the connecting sleeve 15 and closes the port through the cap 19.

[0034] It also includes a magnetic ring 17, which is fixed to the bottom of the connecting sleeve 15. The lifting cylinder 16 is magnetically attracted to the magnetic ring 17, and a spring 18 is fixed between the lifting cylinder 16 and the connecting sleeve 15.

[0035] like Figure 7 and Figure 8 As shown, it also includes a mounting base 26, which is fixed to the outer wall of the tower body 1. A motor 27 is fixed to the mounting base 26, and a drive wheel 28 is fixed to the output shaft of the motor 27. A driven wheel 29 is rotatably connected to the top of the tower body 1. The drive wheel 28 and the driven wheel 29 are in frictional engagement. Magnets 30 are fixed to the driven wheel 29 and are symmetrically distributed along it. A diverter 32 is rotatably connected to the lower end of the oil inlet pipe 3. The diverter 32 is located inside the tower body 1 and includes diverter pipes 321 symmetrically distributed along it. The diverter pipes 321 communicate with the diverter 32. An oil outlet 322 is opened in the middle of the bottom of the diverter 32. A magnet 31 is fixed to the diverter 32, and magnet 30 engages with magnet 31 through magnetic attraction.

[0036] The workflow is as follows: First, air is drawn into the tower to a high vacuum state through the negative pressure pipe 2. Then, crude oil is introduced into the tower body 1 through the oil inlet pipe 3. After passing through the top diversion device (optionally equipped with a rotating diversion frame 32 driven by a magnetic drive via a motor 27 through a drive wheel 28 and a driven wheel 29, so that the crude oil is evenly sprayed onto the top packing), the crude oil flows downward through each layer of packing blocks 5. At the same time, high-temperature superheated steam is introduced through the air inlet 72 at the bottom of the steam spray frame 7. The steam spray frame 7 consists of a ring and three circumferentially distributed branch nozzles fixed to it. The oil guide funnel 81 and the oil outlet pipe 6 are both connected through the ring. The ring has an air inlet 72, and the branch nozzles have multiple equally spaced spray nozzles 71. The high-temperature steam is evenly sprayed upward through the spray nozzles 71, making countercurrent contact with the downward flowing crude oil film. Under the high vacuum environment, the free fatty acids and low-molecular-weight odor substances in the crude oil rise with the water vapor bubbles and are finally extracted and recovered through the negative pressure pipe 2. The deacidified pure tea oil gathers in the oil funnel 81 and flows out through the oil outlet pipe 6.

[0037] During this deacidification process, if the temperature inside the tower is normal, a small amount of high-temperature water vapor will condense and fall along the drainage channel 82 between the outer wall of the oil guide funnel 81 and the inner wall of the tower when it comes into contact with the relatively cool inner wall of the tower body 1. At this time, since the amount of condensate formed is small, the amount of condensate flowing into the moving valve 13 is almost equal to the amount flowing out, so the drive component is still in the initial reset state, the moving valve 13 remains in the high position, the valve port 132 is open, and a small amount of condensate is discharged smoothly and flows into the storage tank 9 through the drain pipe 8. The switching valve 25 is in the "straight-through" position, and the channel 1 251 connects the steam pipe 14 and the air inlet pipe 23, allowing high-temperature steam to enter the tower normally to participate in the deacidification.

[0038] However, when the internal environment of tower body 1 is below the preset range (such as insufficient preheating during startup, shutdown cooling, or a sudden drop in ambient temperature), or when the steam flow rate is too high and exceeds the heat balance capacity, a large amount of water vapor will rapidly condense into water droplets. This condensate accumulates rapidly and quickly enters drain pipe 8 through drain channel 82. As the water level rises, a large amount of water rushes into the moving valve 13. Due to the smaller diameter of valve port 132, the outflow velocity is less than the inflow velocity, and the water accumulation inside the moving valve 13 gradually increases. When the gravity generated by the accumulated water exceeds the tension of the telescopic rod 12, the moving valve 13 begins to move downwards, and the telescopic rod 12 extends downwards. As the moving valve 13 sinks, the originally downward-facing valve port 132 is gradually blocked by the lower limiting ring 10. Once valve port 2 132 is completely closed, valve port 1 131 moves down and aligns with connecting pipe 133. The condensate no longer flows to storage cylinder 9, but is forced to turn and is discharged through valve port 1 131 on the side, and then injected into lifting cylinder 16 inside connecting sleeve 15 through connecting pipe 133.

[0039] The lifting cylinder 16 begins to receive condensate from the connecting pipe 133. As the water volume increases, the total weight of the lifting cylinder 16 and the water inside it increases. Overcoming the elastic force of the spring 18, the lifting cylinder 16 gradually moves downwards until its bottom magnetically attracts the magnetic ring 17. During this process, the lifting cylinder 16 pulls the switching valve 25 downwards via the connecting rod 20. The internal channel design of the switching valve 25 is ingenious: in the initial state (upper position), channel one 251 connects the steam pipe 14 and the air inlet pipe 23, allowing steam to enter the tower; in the lower position, channel one 251 is disconnected, and channel two 252 connects the air inlet pipe 23 and the return pipe 24. Therefore, when the lifting cylinder 16 pulls the switching valve 25 down to the predetermined position, the path of the high-temperature steam changes; it no longer enters the tower body 1 but is discharged to the external environment or condensate recovery device through the return pipe 24. This action automatically cuts off the ineffective steam supply under low-temperature conditions, preventing the generation of more moisture and further accumulation of condensate, thereby protecting the established deacidification effect and oil quality.

[0040] When monitoring personnel find that both the lifting cylinder 16 and the switching valve 25 have completely fallen, it indicates that there is indeed a serious low-temperature condensation problem inside the tower. At this time, the operator should take measures to increase the temperature inside the tower (such as increasing heat tracing, extending the preheating time, or reducing the feed load). After the temperature inside the tower returns to the normal process range, unscrew the cap 19 to drain the condensate from the lifting cylinder 16. As the water is drained, the weight of the lifting cylinder 16 decreases, and under the action of the spring 18, the lifting cylinder 16 drives the connecting rod 20 to return to its original position. The switching valve 25 then rises back to its initial position, the channel 251 is reconnected, steam is once again normally introduced into the tower body 1, and the unit resumes automatic acid removal mode.

[0041] Furthermore, this embodiment also incorporates an anti-interference structure. For example, when the moving valve 13 descends and contacts the limiting ring 10, its indefinite downward movement is prevented, ensuring the switching action is performed correctly. The magnetic ring 17 inside the connecting sleeve 15 magnetically engages with the lifting cylinder 16, providing a certain buffering and positioning effect when the lifting cylinder 16 reaches its bottom limit position, preventing damage from metal impact. The use of transparent materials greatly enhances the visibility and ease of maintenance.

[0042] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. All equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Contents not described in detail in this invention are existing technologies known to those skilled in the art.

Claims

1. A deacidification device for low-temperature pressed tea oil preparation, comprising a tower body (1), wherein a negative pressure pipe (2) is connected to the top side of the tower body (1) and is connected to an external negative pressure device, and an oil inlet pipe (3) is connected to the middle of the top of the tower body (1), and a plurality of fixed rings (4) are fixedly connected from top to bottom inside the tower body (1), and each fixed ring (4) is provided with a packing block (5), characterized in that: An oil guide funnel (81) is fixedly connected to the lower side of the tower body (1), and a steam spray frame (7) is fixedly connected inside it. An oil outlet pipe (6) is fixedly connected to the middle of the bottom of the steam spray frame (7). A drainage channel (82) is formed between the outer wall of the oil guide funnel (81) and the inner wall of the tower body (1). A drain pipe (8) is fixedly connected to the bottom of the tower body (1) and communicates with the drainage channel (82). The end of the drain pipe (8) is fixedly connected to the storage cylinder (9). A reflux mechanism is provided on the oil outlet pipe (6) to automatically realize steam reflux at low temperature so as to stop the steam from being introduced into the tower body (1).

2. The deacidification device for low-temperature pressed tea oil preparation as described in claim 1, characterized in that: The steam spray frame (7) consists of a ring and multiple circumferentially distributed branch nozzles fixed thereon. The oil guide funnel (81) and the oil outlet pipe (6) are connected through the ring. Each branch nozzle has multiple equally spaced spray ports (71). The ring has an air inlet (72) for inputting high-temperature steam.

3. The deacidification device for low-temperature pressed tea oil preparation as described in claim 2, characterized in that: The return mechanism includes a connecting frame (21), which is fixed to the outer wall of the oil outlet pipe (6). An air inlet pipe (23) and a return pipe (24) are fixed to the connecting frame (21). A fixed cylinder (22) is connected between the air inlet pipe (23) and the return pipe (24). A steam pipe (14) is connected between the fixed cylinder (22) and the air inlet (72). A switching valve (25) is slidably connected inside the fixed cylinder (22), which is used to control the output of high-temperature steam through either the steam pipe (14) or the return pipe (24). A connecting rod (20) is slidably connected to the fixed cylinder (22) and is fixed to the switching valve (25). A drive assembly is provided on the drain pipe (8) for automatically driving the connecting rod (20) to move downward at low temperature.

4. The deacidification device for low-temperature pressed tea oil preparation as described in claim 3, characterized in that: The switching valve (25) has a channel one (251) and a channel two (252). The channel one (251) is used to connect the steam pipe (14) and the air inlet pipe (23), and the channel two (252) is used to connect the air inlet pipe (23) and the return pipe (24).

5. The deacidification device for low-temperature pressed tea oil preparation as described in claim 4, characterized in that: Both the connecting sleeve (15) and the fixing cylinder (22) are made of transparent material.

6. The deacidification device for low-temperature pressed tea oil preparation as described in claim 5, characterized in that: The drive assembly includes a limiting ring (10) fixed inside the drain pipe (8). A second fixed ring (11) is fixed inside the drain pipe (8). A telescopic rod (12) distributed circumferentially is fixed on the second fixed ring (11). A movable valve (13) is fixed between each telescopic rod (12). The movable valve (13) moves downward and contacts the limiting ring (10). A valve port (131) is opened on the lower side of the movable valve (13), and a valve port (132) is opened at the bottom of the movable valve (13), which is located above the limiting ring (10). When the movable valve (13) contacts the limiting ring (10) downward, the limiting ring (10) blocks the flow. Valve port two (132), the drain pipe (8) is connected to the side of valve port one (131) by a connecting pipe (133). Initially, it is misaligned with valve port one (131). The connecting pipe (133) is fixedly connected to the connecting sleeve (15), and the two are connected to each other. The connecting sleeve (15) is slidably connected to the lifting cylinder (16). The connecting pipe (133) is used to guide the water in the moving valve (13) into the lifting cylinder (16). The connecting rod (20) is fixedly connected to the bottom wall of the lifting cylinder (16). The bottom end of the lifting cylinder (16) extends downward out of the connecting sleeve (15) and closes the port through the cap (19).

7. The deacidification device for low-temperature pressed tea oil preparation as described in claim 6, characterized in that: It also includes a magnetic ring (17), which is fixed to the bottom of the connecting sleeve (15). The lifting cylinder (16) is magnetically attracted to the magnetic ring (17), and a spring (18) is fixed between the lifting cylinder (16) and the connecting sleeve (15).

8. The deacidification device for low-temperature pressed tea oil preparation as described in claim 7, characterized in that: It also includes a mounting base (26), which is fixed to the outer wall of the tower body (1). A motor (27) is fixed to the mounting base (26). The output shaft of the motor (27) is fixed to a drive wheel (28). A passive wheel (29) is rotatably connected to the top of the tower body (1). The drive wheel (28) and the passive wheel (29) are in frictional engagement. A magnet (30) is fixed to the passive wheel (29) and symmetrically distributed thereon. A diverter (32) is rotatably connected to the lower end of the oil inlet pipe (3). The diverter (32) is located inside the tower body (1). A magnet (31) is fixed to the diverter (32). The magnet (30) engages with the magnet (31) through magnetic attraction.

9. The deacidification device for low-temperature pressed tea oil preparation as described in claim 8, characterized in that: The flow divider (32) includes flow divider pipes (321) symmetrically distributed along it, the flow divider pipes (321) are connected to the flow divider (32), and the flow divider (32) has an oil outlet (322) in the middle of its bottom.

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