Multi-stage filtering device for herbaceous plant essential oil

Abstract

The invention relates to the field of plant essential oil filtration, and discloses a herbaceous plant essential oil multi-stage filtering device which comprises a multi-stage filtering mechanism, and the filtering mechanism comprises an oil inlet ring, a shell, an elastic screen, a rotating mechanism and a lifting mechanism; a plurality of oil inlet holes are formed in the oil inlet ring in the circumferential direction, the elastic screen cloth is tightly attached to the inner side of the oil inlet ring, and plant essential oil flows to the elastic screen cloth through the oil inlet holes and flows to a next-stage filtering mechanism after being filtered by the elastic screen cloth; when the elastic screen is blocked, the position, corresponding to the oil inlet hole, of the elastic screen can be changed by rotating or lifting the elastic screen, so that the part, which is not filtered, of the elastic screen serves as a new screen to filter the plant essential oil, the time for cleaning the screen can be greatly saved, and the filtering efficiency of the plant essential oil is improved. When the elastic screen is blocked in a large area, the elastic screen can be moved upwards and cleaned in a unified mode through the spraying mechanism, the spraying mechanism can act on the elastic screen in a close range, cleaning is convenient, and the cleaning effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plant essential oil filtration, in particular to a multi-stage filtering device for herbal essential oil. BACKGROUND

[0002] Multi-stage filtering of plant essential oil is a process widely used in the field of essential oil purification and cosmetic raw oil preparation in recent years. The purpose is to remove solid impurities, gums, waxes and plant fragments remaining in the pressing or distillation process, improve essential oil purity, extend shelf life, and meet the stringent requirements of high-end applications such as cosmetics, fragrance, etc. on color, odor and impurities.

[0003] In the multi-stage filtering process of plant essential oil, plant essential oil passes through the multi-stage filter screen in turn from top to bottom relying on gravity, so that impurities are trapped on the filter screen. The filter screen is easily clogged by impurities. In view of the above technical problems, the existing filtering device adopts a filter screen that can be turned over in combination with a spraying mechanism to realize cleaning of the filter screen. For example, the patent CN211069239U discloses a multi-stage filtering device for herbal essential oil, which sets the multi-stage filter screen in a turnover structure. When the filter screen is clogged, the filter screen can be turned over by 180°, and then the impurities on the filter screen are removed by the spraying mechanism. However, this structure has the following defects: the multi-stage filter screen is arranged in a turnover structure from top to bottom in the filtering tank. When cleaning is performed, the filter screen needs to be flushed from the oil inlet by the spraying mechanism. On the one hand, there is a certain distance between the oil inlet and the filter screen, and there is generally no light in the filtering tank, so it is difficult to correspond the flushing direction to the filtering area of the filter screen (generally the middle part of the filter screen). On the other hand, for the lower filter screen, the flushing effect of the spraying mechanism is greatly reduced, the main reason being that most of the water jet impact force of the spraying mechanism is absorbed by the uppermost filter screen, resulting in poor cleaning effect of the lower filter screen. Furthermore, the cleaning of the multi-stage filter screen has a sequence requirement, i.e. the uppermost filter screen needs to be turned over and cleaned first, the impurities are then received by the next stage filter screen, and then the next stage filter screen is turned over and cleaned, and so on. The cleaning efficiency is extremely low.

[0004] Therefore, how to provide a multi-stage filtering device for plant essential oil which is convenient to clean the filter screen is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a multi-stage filtering device for herbal essential oil to solve the problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides a multi-stage filtering device for herbal essential oil, comprising a multi-stage filtering mechanism, wherein the filtering mechanism comprises:

[0007] The oil inlet ring is a cylindrical structure with an upper opening and a lower opening. A plurality of oil inlet holes are formed through the inner and outer surfaces of the oil inlet ring. The plurality of oil inlet holes are uniformly arranged along the circumference of the oil inlet ring.

[0008] a housing is arranged at the outer side of the oil inlet ring, the bottom of the housing is provided with a bottom plate, the bottom plate is connected with the outer edge of the bottom of the oil inlet ring, and the housing and the outer side of the oil inlet ring form an essential oil filtering groove;

[0009] an oil inlet pipe is arranged in communication with the essential oil, and the other end of the oil inlet pipe is arranged in communication with the essential oil filtering groove;

[0010] an elastic screen is arranged in the form of a cylinder and coaxially arranged at the inner side of the oil inlet ring, the elastic screen has an outward expansion elastic tendency and is tightly attached to the inner side of the oil inlet ring;

[0011] a rotating mechanism is drivingly connected with the elastic screen and used for driving the elastic screen to rotate along the axis of the oil inlet ring;

[0012] a lifting mechanism is rotatably connected with the elastic screen, and the rotating mechanism is arranged on the lifting mechanism; the lifting mechanism is used for driving the elastic screen and the rotating mechanism to move up and down along the axis of the oil inlet ring;

[0013] an oil outlet cylinder is connected with the inner edge of the bottom of the oil inlet ring, and the oil outlet cylinder is arranged in communication with the oil inlet pipe of the next stage filtering mechanism.

[0014] Further, the oil inlet hole is arranged close to the upper edge of the oil inlet ring, and the other end of the oil inlet pipe is arranged close to the bottom plate.

[0015] Further, the oil inlet hole is arranged in an inclined manner, and the higher end of the oil inlet hole is arranged in communication with the essential oil filtering groove.

[0016] Further, the outer side of the housing is provided with a residue discharge pipe in communication with the essential oil filtering groove, and a valve is arranged on the residue discharge pipe.

[0017] Further, the device further comprises:

[0018] an oil outlet base plate, the bottom of the oil outlet cylinder is arranged in communication with the oil outlet base plate, the oil outlet base plate is arranged in communication with an oil outlet pipe, and the oil outlet pipe is arranged in communication with the oil inlet pipe of the next stage filtering mechanism.

[0019] Further, the oil outlet pipe is provided with an oil pump.

[0020] Further, the rotating mechanism comprises:

[0021] a rotating disc is coaxially arranged above the elastic screen, the top of the elastic screen is embedded into the lower surface of the rotating disc, and the rotating disc is rotatably connected with the lifting mechanism;

[0022] an outer gear ring is arranged at the outer edge of the rotating disc;

[0023] A rotary motor is arranged on the lifting mechanism, and an output end of the rotary motor is provided with a driving gear which is engaged with the outer gear ring.

[0024] The area corresponding to the oil inlet hole of the elastic screen is a normal filtering area, the area between the adjacent two oil inlet holes is a replacement filtering area, the normal filtering area and the replacement filtering area are connected, and the length of the replacement filtering area is greater than that of the normal filtering area.

[0025] Further, the application further comprises:

[0026] A bearing is arranged in the mounting hole of the middle part of the rotating disc.

[0027] A connecting shaft is arranged in the bearing, and the top end of the connecting shaft is connected with the lifting mechanism.

[0028] Further, the lifting mechanism comprises:

[0029] A top plate is arranged on the lower surface of the top plate, and the rotary motor and the top end of the connecting shaft are arranged on the lower surface of the top plate.

[0030] A lifting cylinder is connected with the top plate, and is used for driving the top plate to move up and down along the axis of the oil inlet ring.

[0031] The normal filtering area and the replacement filtering area jointly form an annular filtering strip, the elastic screen is composed of a plurality of filtering strips, and when the top plate moves up and down along the axis of the oil inlet ring, different filtering strips can be moved to the horizontal position of the oil inlet hole.

[0032] Further, the application further comprises:

[0033] A spraying mechanism is arranged on the outer side of the shell, when the top plate moves upward, part of the elastic screen moves above the oil inlet ring, and the spraying mechanism is used for spraying and cleaning the elastic screen.

[0034] The application has the following technical effects:

[0035] 1. The oil inlet ring is arranged with a plurality of oil inlet holes in the circumferential direction, and the elastic screen is tightly attached to the inner side of the oil inlet ring. The plant essential oil flows to the elastic screen through the oil inlet holes, and after being filtered by the elastic screen, it flows to the next stage of filtering mechanism. When the elastic screen is blocked, the position of the elastic screen corresponding to the oil inlet hole can be changed by rotating or lifting the elastic screen, so that the part of the elastic screen that has not been filtered acts as a "new" screen to filter the plant essential oil, which can greatly save the time of cleaning the screen and improve the filtering efficiency of the plant essential oil. When the elastic screen changes position several times and is blocked in a large area, the elastic screen can be lifted by the lifting mechanism and cleaned uniformly by the spraying mechanism. The spraying mechanism can act on the elastic screen at close range, which is convenient and effective, and has good application prospect and wide application range.

[0036] 2. The plant essential oil enters the essential oil filtering tank near the bottom plate. As more and more plant essential oil enters the essential oil filtering tank, impurities are deposited on the bottom plate, and the liquid level of the plant essential oil gradually rises, and finally flows to the elastic screen from the oil inlet hole. Compared with the prior art, large-particle impurities and impurities with high weight can be naturally settled on the bottom plate before being filtered by the screen, thereby reducing the risk of blocking the elastic screen. The impurities deposited on the bottom plate and the residual essential oil can be discharged through the slag discharge pipe.

[0037] 3. The rotating mechanism adopts a gear ring mechanism, which can accurately set the single rotation distance of the elastic screen according to the length of the normal filtering area and the replacement filtering area, so as to ensure that the elastic screen that has not been filtered moves to the oil inlet hole, and the original blocked elastic screen moves to the adjacent oil inlet hole. In addition, the length of the replacement filtering area is greater than that of the normal filtering area, so the elastic screen can be rotated several times to move different sections in the length direction of the replacement filtering area to the oil inlet hole to filter the plant essential oil.

[0038] 4. The lifting mechanism can synchronously lift the rotating mechanism and the elastic screen. After the lifting mechanism adjusts the up-down position of the elastic screen, the rotating mechanism can still drive the elastic screen to rotate, so that the elastic screen is used as much as possible, thereby further reducing the cleaning frequency of the elastic screen and improving the filtering efficiency of the plant essential oil. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0040] Fig. 1 The structure of the present application is shown in the figure;

[0041] Fig. 2A schematic diagram of the cooperation between the rotating mechanism and the elastic screen;

[0042] Fig. 3 A schematic diagram of the cooperation between the elastic screen and the oil inlet ring;

[0043] Fig. 4 A schematic diagram of the cooperation between the oil inlet ring;

[0044] Wherein, 1, the oil inlet ring; 101, the oil inlet hole; 2, the shell; 3, the refined oil filtering groove; 4, the oil inlet pipe; 5, the elastic screen; 6, the oil outlet cylinder; 7, the slag discharge pipe; 8, the valve; 9, the oil outlet chassis; 10, the oil outlet pipe; 11, the oil pump; 12, the rotating disc; 13, the outer gear ring; 14, the rotating motor; 15, the driving gear; 16, the bearing; 17, the connecting shaft; 18, the top plate; 19, the lifting cylinder. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0047] As Figs. 1 to 4 shown, the present application provides a multi-stage filtering device for herb essential oil, which comprises a multi-stage filtering mechanism, and the filtering mechanism comprises:

[0048] The oil inlet ring 1 is a cylindrical structure with an upper opening and a lower opening, and a plurality of oil inlet holes 101 are arranged on the inner and outer surfaces of the oil inlet ring 1 and uniformly distributed along the circumferential direction of the oil inlet ring 1.

[0049] The shell 2 is arranged on the outer side of the oil inlet ring 1, and the bottom of the shell 2 has a bottom plate which is connected to the outer edge of the bottom of the oil inlet ring 1, and the shell 2 and the outer side of the oil inlet ring 1 form a refined oil filtering groove 3.

[0050] The oil inlet pipe 4 is in communication with the plant essential oil at one end and in communication with the refined oil filtering groove 3 at the other end.

[0051] The elastic screen 5 is coaxially arranged on the inner side of the oil inlet ring 1 in a cylindrical shape, and has an elastic tendency to expand outward and tightly abuts the inner side of the oil inlet ring 1.

[0052] The rotating mechanism is in transmission connection with the elastic screen 5 and is used to drive the elastic screen 5 to rotate along the axis of the oil inlet ring 1.

[0053] The lifting mechanism is rotatably connected with the elastic screen 5, and the rotating mechanism is arranged on the lifting mechanism; the lifting mechanism is used to drive the elastic screen 5 and the rotating mechanism to move up and down along the axis of the oil inlet ring 1;

[0054] The oil outlet cylinder 6 is connected with the inner edge of the bottom of the oil inlet ring 1, and the oil outlet cylinder 6 is communicated with the oil inlet pipe 4 of the next stage filtering mechanism.

[0055] In the embodiment, the aperture of the elastic screen 5 gradually decreases in the multi-stage filtering mechanism, and the specific material of the elastic screen 5 can be flexibly selected according to actual needs, as long as the elastic screen 5 can be closely attached to the oil inlet ring 1 with a small elastic trend; it should be noted that the elastic trend of the elastic screen 5 expanding outward will not affect the rotation of the rotating mechanism, and only slightly increase the rotating friction between the elastic screen 5 and the inner side of the oil inlet ring 1, which can be ignored; similarly, it will not affect the up and down movement of the lifting mechanism. The aperture of the oil inlet hole 101 should not be too small, and should be appropriately adjusted according to the filtering flow requirements of the plant essential oil, the aperture of the elastic screen 5 and other factors.

[0056] In the embodiment, the oil inlet hole 101 is arranged close to the upper edge of the oil inlet ring 1, and the other end of the oil inlet pipe 4 is arranged close to the bottom plate. After the plant essential oil enters the essential oil filtering groove 3, the impurities are deposited on the bottom plate and the plant essential oil liquid level gradually increases, and finally flows from the oil inlet hole 101 to the elastic screen 5, which can preliminarily screen out the large particle impurities in the plant essential oil.

[0057] In the embodiment, the oil inlet hole 101 is arranged obliquely, and the higher end thereof is communicated with the essential oil filtering groove 3. Considering that part of the impurities in the plant essential oil may remain in the oil inlet hole 101, the oil inlet hole 101 is arranged obliquely in the embodiment, which can make the impurities slide to the elastic screen 5 direction by using their own gravity.

[0058] In the embodiment, the outer side of the shell 2 is provided with a slag discharge pipe 7 communicated with the essential oil filtering groove 3, and the slag discharge pipe 7 is provided with a valve 8. The valve 8 can be opened to discharge the impurities deposited on the bottom plate and the residual plant essential oil.

[0059] In the embodiment, it further comprises:

[0060] The oil outlet disc 9 is communicated with the bottom of the oil outlet cylinder 6, and the oil outlet disc 9 is communicated with the oil outlet pipe 10, and the oil outlet pipe 10 is communicated with the oil inlet pipe 4 of the next stage filtering mechanism.

[0061] In the embodiment, the oil outlet pipe 10 is provided with an oil pump 11, the plant essential oil flows to the elastic screen 5 at a certain flow rate, flows downward to the oil outlet disc 9 after passing through the elastic screen 5, and is pumped to the next stage filtering mechanism by the oil pump 11 for filtering.

[0062] In the embodiment, the rotating mechanism comprises:

[0063] The rotating disc 12 is coaxially arranged above the elastic screen 5, the top of the elastic screen 5 is embedded into the lower surface of the rotating disc 12, and the rotating disc 12 is rotatably connected with the lifting mechanism;

[0064] The outer gear ring 13 is arranged at the outer edge of the rotating disc 12;

[0065] The rotating motor 14 is arranged on the lifting mechanism, and the output end of the rotating motor 14 is provided with the driving gear 15 which is engaged with the outer gear ring 13;

[0066] The area of the elastic screen 5 corresponding to the oil inlet hole 101 is the normal filtering area, the area of the elastic screen 5 between the adjacent two oil inlet holes 101 is the replacement filtering area, the normal filtering area and the replacement filtering area are connected, and the length of the replacement filtering area is greater than that of the normal filtering area, the rotating motor 14 is used to rotate the replacement filtering area to the position corresponding to the oil inlet hole 101 and rotate the normal filtering area between the adjacent two oil inlet holes 101. The normal filtering area and the replacement filtering area can be arranged in a certain proportion, for example, the width of the normal filtering area is 1.2 times the hole diameter of the oil inlet hole 101, the width of the replacement filtering area is 2.4 times the hole diameter of the oil inlet hole 101 (i.e. two replacement elastic screen areas are reserved between the adjacent two oil inlet holes 101), and the distance between the adjacent two oil inlet holes 101 on the oil inlet ring 1 corresponds to the replacement filtering area. When the rotating mechanism drives the elastic screen to rotate horizontally by a distance of one normal filtering area, the front half of the replacement filtering area can be moved to the oil inlet hole 101, and the rear half of the replacement filtering area can be moved to the oil inlet hole 101 by rotating again. If it is rotated again, the clogged elastic screen will be moved to the oil inlet hole 101, at which time the up-down position of the elastic screen 5 needs to be adjusted, or the elastic screen 5 needs to be cleaned.

[0067] In the embodiment, the rotating mechanism further comprises:

[0068] The bearing 16 is arranged in the mounting hole in the middle of the rotating disc 12;

[0069] The connecting shaft 17 is arranged in the bearing 16, and the top end of the connecting shaft 17 is connected with the lifting mechanism.

[0070] In the embodiment, the lifting mechanism comprises:

[0071] The top plate 18 is arranged on the lower surface of the top plate 18, and the top end of the connecting shaft 17 is arranged on the lower surface of the top plate 18;

[0072] The lifting cylinder 19 is connected with the top plate 18 and is used to drive the top plate 18 to move up and down along the axis of the oil inlet ring 1;

[0073] The normal filtering area and the replacement filtering area together form a ring-shaped filtering strip, and the elastic screen 5 is formed by a plurality of filtering strips (which can be understood as a plurality of filtering strips stacked one above another). When the top plate 18 moves up and down along the axis of the oil inlet ring 1, different filtering strips can be moved to the horizontal position of the oil inlet hole 101.

[0074] In the embodiment, the following is further included:

[0075] A spraying mechanism is arranged adjacent to the outside of the shell 2. When the top plate 18 moves upward, part of the elastic screen moves above the oil inlet ring 1, and the spraying mechanism is used to spray and clean the elastic screen. The spraying mechanism can be of the prior art and is completely independent of other structures of the embodiment. Alternatively, other cleaning mechanisms suitable for removing impurities from plant essential oil, such as a high-pressure air cleaning mechanism, can be used.

[0076] The specific working process is as follows:

[0077] The plant essential oil is fed into the essential oil filtering tank 3 through the oil inlet pipe 4. The plant essential oil contains solid impurities, gum, wax, and plant fragments that are left over from the pressing or distillation process. The larger and heavier impurities naturally settle on the bottom plate of the essential oil filtering tank 3. As the plant essential oil continues to be fed in, the liquid level in the essential oil filtering tank 3 gradually rises. When the liquid level reaches the position of the oil inlet hole 101, the plant essential oil enters the oil inlet hole 101 and flows at a certain flow rate to the elastic screen 5. During the passage of the plant essential oil through the elastic screen 5, the impurities are intercepted by the elastic screen 5, and the filtered plant essential oil flows downward to the oil outlet cylinder 6, and then is fed into the next stage of the filtering mechanism through the oil outlet base 9, the oil outlet pipe 10, and the oil pump 11, thereby achieving multi-stage filtering of the plant essential oil.

[0078] When the elastic screen 5 is initially clogged, the rotating motor 14 drives the drive gear 15 to rotate, the drive gear 15 meshes with the outer gear ring 13 and drives the rotating disc 12 and the elastic screen 5 integrated with the rotating disc 12 to rotate. Taking clockwise rotation as an example, at this time, the normal filtering area originally corresponding to the oil inlet hole 101 rotates clockwise to the area on the left side of the oil inlet hole 101, and the replacement filtering area originally located on the right side of the oil inlet hole 101 rotates clockwise to the position opposite to the oil inlet hole 101. If the arrangement of the normal filtering area and the replacement filtering area in the above embodiment is adopted, at this time, the area corresponding to the oil inlet hole 101 is the front half of the replacement filtering area. Since this area has not been used for filtering plant essential oil, it can be directly used when it is moved to the position of the oil inlet hole 101. Similarly, when the front half of the replacement filtering area is clogged, the back half of the replacement filtering area can be moved to the position corresponding to the oil inlet hole 101 to filter plant essential oil.

[0079] When the normal filter area and all the replacement filter areas are blocked, the rotating elastic filter screen can no longer meet the filtering requirements. At this time, the lifting mechanism can drive the elastic filter screen and the rotating mechanism to move synchronously in the up-down direction. At this time, the other filter strips located above or below the original filter strip (normal filter area and replacement filter area assembly) are moved to the horizontal position of the oil inlet hole 101 and can be used as new filter strips. At this time, the area corresponding to the oil inlet hole 101 is used as the normal filter area, and the other areas are used as the replacement filter area. Similarly, when the normal filter area in the new filter strip is blocked, the above steps can be repeated to change the position of the elastic filter screen. When the lifting mechanism is lowered with the elastic filter screen, part of the elastic filter screen may enter the inside of the oil outlet cylinder 6, but this will not affect the downward flow of the filtered plant essential oil. The plant essential oil has a certain flow rate, and after passing through the elastic filter screen, it will continue to flow forward for a distance, and the plant essential oil will be a certain distance away from the elastic filter screen. A small part of the plant essential oil will come into contact with the blocked part of the elastic filter screen and mix with impurities, so the secondary contamination in this case can be ignored.

[0080] When the entire elastic filter screen is blocked in a large area, changing the position of the elastic filter screen through the rotating mechanism and the lifting mechanism cannot meet the filtering requirements. At this time, the elastic filter screen needs to be cleaned. Specifically, the lifting mechanism moves the elastic filter screen upward, so that most of the elastic filter screen is moved above the oil inlet ring 1 and exposed to the air. At this time, attention should be paid to the fact that the bottom of the elastic filter screen is reserved to be within the oil inlet ring 1. In this way, it can be ensured that the oil inlet ring 1 and the elastic filter screen are not separated. The reserved part of the elastic filter screen is only used as a reserved part, and this part can not be used to filter the plant essential oil. The elastic filter screen is cleaned by the spraying mechanism, and after cleaning, the elastic filter screen is reset by the lifting mechanism and can be used again.

[0081] When the plant essential oil filtering operation is completed, the valve 8 on the residue discharge pipe 7 can be opened to discharge the residual essential oil and impurities inside. If waste is considered, a filter screen can be provided at the residue discharge pipe 7 to recover the residual essential oil. To improve the residue discharge effect, after the residual essential oil is discharged, a cleaning liquid can be introduced into the essential oil filtering tank 3. The height of the cleaning liquid is always lower than the oil inlet hole 101, so that all the residual impurities are discharged from the residue discharge pipe 7. Finally, the equipment can be maintained daily.

[0082] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0083] The above described embodiments are only to illustrate the preferred modes of the present application, and are not intended to limit the scope of the present application. Any modification and improvement made by those skilled in the art to the technical solutions of the present application without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A multi-stage filtration device for herbal plant essential oils, characterized in that, Includes a multi-stage filtration mechanism, the filtration mechanism comprising: The oil inlet ring (1) is a cylindrical structure with openings at the top and bottom. The oil inlet ring (1) has multiple oil inlet holes (101) through its inner and outer surfaces. The multiple oil inlet holes (101) are evenly arranged along the circumference of the oil inlet ring (1). The housing (2) is spaced apart on the outside of the oil inlet ring (1). The bottom of the housing (2) has a bottom plate, which is connected to the outer edge of the bottom of the oil inlet ring (1). The housing (2) and the outer side of the oil inlet ring (1) form an essential oil filter groove (3). The oil inlet pipe (4) is connected to the plant essential oil at one end and to the essential oil filter tank (3) at the other end; The elastic screen (5) is cylindrical and coaxially arranged inside the oil inlet ring (1). The elastic screen (5) has an outward expansion elastic tendency and is closely attached to the inside of the oil inlet ring (1). A rotating mechanism is connected to the elastic screen (5) for driving the elastic screen (5) to rotate along the axis of the oil inlet ring (1); The lifting mechanism is rotatably connected to the elastic screen (5), and the rotating mechanism is mounted on the lifting mechanism; the lifting mechanism is used to drive the elastic screen (5) and the rotating mechanism to move up and down along the axis of the oil inlet ring (1); The oil outlet cylinder (6) is connected to the inner edge of the bottom of the oil inlet ring (1), and the oil outlet cylinder (6) is connected to the oil inlet pipe (4) of the next stage filter mechanism.

2. The multi-stage filtration device for herbal essential oils according to claim 1, characterized in that, The oil inlet hole (101) is arranged near the upper edge of the oil inlet ring (1), and the other end of the oil inlet pipe (4) is arranged near the bottom plate.

3. The multi-stage filtration device for herbal essential oils according to claim 2, characterized in that, The oil inlet (101) is arranged at an angle, with its higher end connected to the essential oil filter tank (3).

4. The multi-stage filtration device for herbal essential oils according to claim 2, characterized in that, The outer side of the housing (2) is provided with a slag discharge pipe (7) that communicates with the essential oil filter tank (3), and a valve (8) is provided on the slag discharge pipe (7).

5. The multi-stage filtration device for herbal essential oils according to claim 1, characterized in that, Also includes: The bottom of the oil outlet chassis (9) is connected to the oil outlet cylinder (6), the oil outlet chassis (9) is connected to the oil outlet pipe (10), and the oil outlet pipe (10) is connected to the oil inlet pipe (4) of the next stage filtration mechanism.

6. The multi-stage filtration device for herbal essential oils according to claim 5, characterized in that, An oil pump (11) is installed on the oil outlet pipe (10).

7. The multi-stage filtration device for herbal essential oils according to claim 1, characterized in that, The rotating mechanism includes: A turntable (12) is coaxially positioned above the elastic screen (5), with the top of the elastic screen (5) embedded in the lower surface of the turntable (12), and the turntable (12) is rotatably connected to the lifting mechanism. An external gear ring (13) is disposed on the outer edge of the turntable (12); A rotary motor (14) is mounted on the lifting mechanism. The output end of the rotary motor (14) is provided with a drive gear (15), which meshes with the external gear ring (13). The area corresponding to the oil inlet hole (101) of the elastic screen (5) is the normal filtration area. The area between two adjacent oil inlets (101) of the elastic screen (5) is the replacement filtration area. The normal filtration area and the replacement filtration area are connected and the length of the replacement filtration area is greater than the length of the normal filtration area. The rotary motor (14) is used to rotate the replacement filtration area to the position corresponding to the oil inlet hole (101) and rotate the normal filtration area between two adjacent oil inlets (101).

8. A multi-stage filtration device for herbal essential oils according to claim 7, characterized in that, Also includes: The bearing (16) is provided with a mounting hole in the middle of the turntable (12), and the bearing (16) is disposed in the mounting hole; The connecting shaft (17) is located inside the bearing (16), and its top end is connected to the lifting mechanism.

9. A multi-stage filtration device for herbal essential oils according to claim 8, characterized in that, The lifting mechanism includes: The top of the top plate (18), the top of the rotary motor (14) and the connecting shaft (17) are both located on the lower surface of the top plate (18); The lifting cylinder (19) is connected to the top plate (18) and is used to drive the top plate (18) to move up and down along the axis of the oil inlet ring (1); The normal filtration zone and the replacement filtration zone together form an annular filter bar. The elastic screen (5) is composed of multiple filter bars. When the top plate (18) moves up and down along the axis of the oil inlet ring (1), it can move different filter bars to the horizontal position where the oil inlet hole (101) is located.

10. A multi-stage filtration device for herbal essential oils according to claim 1, characterized in that, Also includes: The spraying mechanism is arranged adjacent to the outer side of the housing (2). When the top plate (18) moves upward, part of the elastic filter screen moves above the oil inlet ring (1). The spraying mechanism is used to spray and clean the elastic filter screen.

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