Heat-conducting oil furnace for extracting citrus essential oil

Abstract

The invention belongs to the technical field of heat-conducting oil furnaces, particularly relates to a heat-conducting oil furnace for extracting citrus essential oil, and aims to solve the problems that an electric heating type heat-conducting oil furnace in the prior art is slow to start and high in power consumption, the following scheme is provided: the heat-conducting oil furnace comprises an outer cylinder which is integrally horizontally placed and is of a tubular structure, and four supporting columns are fixed on the outer wall of the circumference of the outer cylinder close to the bottom; a preheating oil tank is slidably connected to the inner wall of the outer barrel, the axis of the preheating oil tank is parallel to the axis of the outer barrel, a burning-resistant inner pipe communicating with the two ends of the preheating oil tank is inserted into the middle of the preheating oil tank, and a cavity formed between the circumferential outer wall of the burning-resistant inner pipe and the circumferential inner wall of the preheating oil tank is a secondary oil storage chamber. The spiral oil pipe can be wrapped by flames all the time, redundant firepower can heat the inner wall of the burning-resistant inner pipe, then heat conduction oil in the second-stage oil storage chamber is preheated, and therefore the heating efficiency is greatly improved, and the heat loss is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat-conducting oil furnaces, in particular to a heat-conducting oil furnace for extracting citrus essential oil. Background Art

[0002] As a common industrial heating equipment, thermal oil furnace is widely used in petrochemical, chemical, food, metallurgy and other industries; thermal oil boiler refers to a boiler heated by thermal oil. Thermal oil, also known as organic heat carrier or heat medium oil, has been used as an intermediate heat transfer medium in the industrial heat exchange process for more than 50 years. It is a direct current boiler developed based on the forced circulation design concept. It generally uses coal, oil, and gas as fuel and thermal oil as the medium. It uses a hot oil circulation pump to force the medium to circulate in the liquid phase, and then returns the heat energy to the heat-using equipment and then returns to the heating furnace for reheating. It has the characteristics of obtaining high working temperature under low pressure and can perform high-precision control of the medium operation.

[0003] As we all know, drying citrus peel is a very important process in the extraction of citrus essential oils. However, traditional electric heating and direct high-temperature baking are not conducive to the drying of citrus peels. Therefore, using thermal oil for constant temperature drying is the best choice; it is used because of its many advantages.

[0004] After searching, it is found that the thermal oil furnace in the prior art mostly adopts electric heating to heat the thermal oil in order to improve the heating efficiency. This method is suitable for small drying equipment. When it is used to heat up multiple heat-using equipment at the same time, this electric heating method is very power-consuming and will generate a lot of heat waste at the thermal oil furnace. Therefore, in order to reduce the waste of heat energy, we propose a new energy-saving thermal oil furnace. Summary of the invention

[0005] In view of the technical problems of slow startup and high power consumption of the electrically heated thermal oil furnace in the prior art, the present invention adopts the following technical solutions: A heat-conducting oil furnace for extracting citrus essential oil comprises an outer cylinder of a tubular structure placed horizontally as a whole, four supporting columns are fixed to the circumferential outer wall of the outer cylinder near the bottom, a preheating oil tank is slidably connected to the inner wall of the outer cylinder, and the axis of the preheating oil tank is parallel to the axis of the outer cylinder, a burn-resistant inner tube connecting the two ends of the preheating oil tank is inserted in the middle of the preheating oil tank, and a chamber formed between the circumferential outer wall of the burn-resistant inner tube and the circumferential inner wall of the preheating oil tank is a secondary oil storage chamber; a combustion unit is provided at one end of the burn-resistant inner tube; and a spiral oil pipe with a conical spring-like structure is fixed inside the burn-resistant inner tube, one end of the spiral oil pipe close to the combustion unit is connected to a suction pipe inserted into the secondary oil storage chamber, and an oil pump is provided at the other end of the spiral oil pipe.

[0006] Preferably, the combustion unit includes a burner fixing cover which is detachably fixedly connected to the tube mouth of the fire-resistant inner tube, and a burner is fixedly inserted in the middle of the burner fixing cover; through such an arrangement, the burner fixing cover can be easily disassembled, and then the circumferential inner wall of the fire-resistant inner tube can be regularly cleaned of ash to ensure continuously good thermal conductivity efficiency.

[0007] Preferably, the burn-resistant inner tube is not concentric with the preheating oil tank, and the center line of the burn-resistant inner tube is located above the center line of the preheating oil tank; an eccentric baffle ring is fixed to the end of the preheating oil tank away from the combustion unit; and a plurality of radially distributed heat conduction plates are fixed to the circumferential outer wall of the burn-resistant inner tube.

[0008] Preferably, a plurality of small holes are opened on the outer wall of the suction pipe located in the secondary storage oil chamber, and a socket is opened on the suction pipe at the distribution position of the small holes, and an anti-clogging mechanism extending horizontally outward is inserted in the socket; the anti-clogging mechanism includes a one-way valve tube inserted in the socket, and the end of the one-way valve tube away from the suction pipe is connected to an externally threaded barrel, and a piston plate is slidably connected to the circumferential inner wall of the externally threaded barrel, and a return spring is fixed between the piston plate and the bottom of the barrel; a screw hole matching the outer diameter of the externally threaded barrel is opened on the end of the preheating oil tank close to the combustion unit.

[0009] Preferably, a smoke exhaust pipe is fixed to the end of the burn-resistant inner tube away from the combustion unit, and a fixing seat is fixed to the surface of the eccentric baffle ring below the smoke exhaust pipe, the oil pump is detachably fixedly connected to the top of the fixing seat, and a heat-resistant transfer tube is connected between the oil inlet end of the oil pump and the end of the spiral oil pipe; an arc-shaped support plate is fixed to the outer wall of the preheating oil tank near the bottom end, and two mutually symmetrical groove-type slide rails are fixed to the circumferential inner wall of the outer cylinder near the bottom end, the arc-shaped support plate is slidably connected in the groove-type slide rails, and a power outlet pipe is provided at the end of the oil pump away from the heat-resistant transfer tube.

[0010] Preferably, both ends of the preheating oil tank are provided with self-locking threaded holes near the bottom, and plugs are screwed into the two self-locking threaded holes; the oil stains that have settled to the bottom can be discharged regularly through the provided plugs.

[0011] Preferably, a slag discharge hole is opened on the circumferential outer wall of the outer cylinder between the two groove-shaped slide rails, and the position of the slag discharge hole is adapted to the position of the plug; a side observation window is opened on the circumferential outer wall of the outer cylinder close to the front, and the position of the side observation window is adapted to the position of the anti-blocking mechanism, and the piston plate can be knocked through the side observation window, thereby facilitating the unblocking of the small hole in the suction tube.

[0012] Preferably, a notch is provided near the top of one end of the outer cylinder close to the combustion unit, and a horizontally extending fixing platform is reserved at the bottom of the notch, and mutually symmetrical hinged ear plates are fixed on both sides of the circumferential outer wall of the outer cylinder close to the fixing platform, and two mutually symmetrical L-shaped support frames are rotatably connected between the two hinged ear plates, and the same fixing clamp ring is fixed to one end of the two L-shaped support frames away from the hinged ear plates, and a storage oil barrel with a cylindrical structure with an internal cavity is clamped in the middle of the fixing clamp ring; the outer diameters of the storage oil barrel and the fixing clamp ring are smaller than the width of the notch passing through the notch, so that they can be folded and stored inside the outer cylinder, which is more convenient for storage and transportation. The upper surface of the fixed platform is provided with a latch mechanism for fixing the flipped storage oil barrel, and the latch mechanism includes a turntable rotatably connected to the middle part of the upper surface of the fixed platform, and the upper surface of the turntable is rotatably connected to two connecting rod push rods symmetrically distributed in the center near the edge; the upper surface of the fixed platform is provided with L-shaped rails facing the hinged ear plates on the sides near the front and rear edges, and sliding latches are slidably connected in the two groups of L-shaped rails; the ends of the two connecting rod push rods away from the turntable are respectively hinged on the upper surfaces of the corresponding sliding latches; by rotating the turntable, the two sliding latches can be pushed out at the same time, and then the two flipped L-shaped support frames can be fixed.

[0013] Preferably, a cold oil inlet pipe and a pressure differential oil outlet pipe are respectively connected to the outer wall of the storage oil barrel near the upper and lower ends, and a connecting hose is sleeved at the pipe mouth of the pressure differential oil outlet pipe; a strip sliding hole is opened at the top of the outer cylinder near the fixed platform, and a vertical pipe connected to the secondary storage oil chamber is connected to the outer wall of the preheating oil tank near the top, and the top of the vertical pipe is connected to the other end of the connecting hose, so as to supply oil to the secondary storage oil chamber, ensuring that the secondary storage oil chamber is always in a fully loaded state, and once again ensuring that there is no empty burning phenomenon in the spiral oil pipe, which plays a safety role in the device.

[0014] Preferably, two vertical auxiliary support rods are slidably inserted into the end of the circumferential outer wall of the fixed clamping ring away from the fixed platform, and the inner wall of the outer cylinder is fixed with fixed blocks at the edges on both sides of the notch, and the opposite sides of the two fixed blocks are both inserted with grooves with groove-shaped support plates for supporting the auxiliary support rods; it has the effect of auxiliary support for the storage oil barrel and reduces the pressure on the latch mechanism.

[0015] The beneficial effects of the present invention are: 1. By setting the spiral oil pipe in the shape of a conical spring inside the fire-resistant inner tube, not only can the diameter be reduced along with the change of the volume and shape of the firepower, so that the spiral oil pipe is always wrapped by the flame, but the excess firepower can also heat the inner wall of the fire-resistant inner tube, and then preheat the heat transfer oil in the secondary storage oil chamber, thereby greatly improving the heating efficiency and reducing the heat loss.

[0016] 2. By arranging the burn-resistant inner tube and the preheating oil tank which are arranged unequally, the suction space of the suction pipe is enlarged, and it is more convenient to arrange the filtering mechanism to filter the heat transfer oil which is about to enter the spiral oil pipe.

[0017] 3. Through the anti-clogging mechanism, when the suction capacity of the suction pipe becomes weak, that is, when the small holes on its surface may be blocked, you only need to suddenly hit the piston plate into the barrel to allow the suction pipe to generate oil pressure from the inside to the outside, and then dredge the small holes to ensure the normal suction capacity of the suction pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a heat transfer oil furnace for citrus essential oil extraction proposed by the present invention; Figure 2 This is a schematic diagram of the upward three-dimensional structure of a heat-conducting oil furnace for extracting citrus essential oil proposed by the present invention; Figure 3 This is a schematic structural diagram of a heat-conducting oil furnace for citrus essential oil extraction proposed by the present invention in a folded state; Figure 4 A side view of a thermal oil furnace for extracting citrus essential oils proposed by the present invention; Figure 5 A heat-conducting oil furnace for extracting citrus essential oil proposed by the present invention Figure 4 Schematic diagram of the cross-sectional structure along line AA; Figure 6 This is a schematic diagram of the overall structure of an outer cylinder in a heat-conducting oil furnace for citrus essential oil extraction proposed by the present invention; Figure 7 This is a schematic diagram of the assembly structure of a burner fixing cover and a smoke exhaust pipe in a thermal oil furnace for extracting citrus essential oil proposed by the present invention; Figure 8 This is a schematic diagram of the assembly structure of a preheating oil tank of a thermal oil furnace for citrus essential oil extraction proposed by the present invention; Fig. 9 This is a schematic cross-sectional view of an anti-blocking mechanism in a preheating oil tank of a thermal oil furnace for extracting citrus essential oils proposed by the present invention; Fig.10 The present invention provides a schematic structural diagram of a latch mechanism in a preheating oil tank of a thermal oil furnace for extracting citrus essential oil.

[0019] In the figure: 1, outer cylinder; 101, strip slide hole; 102, side observation window; 103, slag discharge hole; 104, fixed platform; 105, groove slide rail; 2, connecting hose; 3, L-shaped support frame; 4, storage oil drum; 5, fixed clamp ring; 6, auxiliary support rod; 7, through the gap; 8, fixed block; 9, anti-blocking mechanism; 901, external thread barrel; 902, reset spring; 903, piston plate; 904, one-way valve pipe; 10, hinged ear plate; 11, support column; 12, smoke exhaust pipe; 13, cold Oil inlet pipe; 14. Burner; 15. Preheating oil tank; 151. Eccentric retaining ring; 152. Screw hole; 16. Arc support plate; 17. Power outlet pipe; 18. Oil pump; 19. Heat-resistant transfer pipe; 20. Vertical pipe; 21. Latch mechanism; 2101. Turntable; 2102. Connecting rod push rod; 2103. Sliding latch; 2104. L-shaped rail; 22. Burn-resistant inner tube; 2201. Burner fixing cover; 2202. Heat conduction plate; 23. Suction pipe; 24. Plug 1; 25. Spiral oil pipe. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In this embodiment, refer to Figure 1-Figure 10 A heat-conducting oil furnace for extracting citrus essential oil comprises an outer cylinder 1 of a tubular structure placed horizontally as a whole, four support columns 11 are fixed to the outer circumferential wall of the outer cylinder 1 near the bottom, a preheating oil tank 15 with a horizontal cylindrical barrel structure with a cavity therein is slidably connected to the inner wall of the outer cylinder 1, and the axis of the preheating oil tank 15 is parallel to the axis of the outer cylinder 1, a fire-resistant inner tube 22 connecting the two ends of the preheating oil tank 15 is inserted in the middle of the preheating oil tank 15, and the chamber formed between the outer circumferential wall of the fire-resistant inner tube 22 and the inner circumferential wall of the preheating oil tank 15 is a secondary oil storage chamber; a combustion unit is arranged at one end of the fire-resistant inner tube 22; and the fire-resistant inner tube 22 A spiral oil pipe 25 with a conical spring-like structure is fixed inside, and one end of the spiral oil pipe 25 close to the combustion unit is connected to a suction pipe 23 inserted into the secondary storage oil chamber, and an oil pump 18 is provided at the other end of the spiral oil pipe 25; by setting the spiral oil pipe 25 in a conical spring shape inside the fire-resistant inner tube 22, not only can the diameter be reduced along with the change of the fire volume shape, so that the spiral oil pipe 25 can always be wrapped by the flame, but the excess fire can also heat the inner wall of the fire-resistant inner tube 22, and then preheat the heat transfer oil in the secondary storage oil chamber, thereby greatly improving the heating efficiency and reducing the heat loss.

[0022] In the present invention, the combustion unit includes a burner fixing cover 2201 which is detachably fixedly connected to the tube mouth of the fire-resistant inner tube 22, and a burner 14 is fixedly inserted in the middle of the burner fixing cover 2201; through such an arrangement, the burner fixing cover 2201 can be easily disassembled, and then the circumferential inner wall of the fire-resistant inner tube 22 can be regularly cleaned of ash and slag to ensure that the thermal conductivity efficiency remains good.

[0023] Reference Figure 7-Figure 8 The burn-resistant inner tube 22 is not concentric with the preheating oil tank 15, and the center line of the burn-resistant inner tube 22 is located above the center line of the preheating oil tank 15; an eccentric retaining ring 151 is fixed to the end of the preheating oil tank 15 away from the combustion unit; and a plurality of radially distributed heat conducting plates 2202 are fixed to the circumferential outer wall of the burn-resistant inner tube 22; by arranging the burn-resistant inner tube 22 and the preheating oil tank 15 not concentrically, the suction space of the suction pipe 23 is enlarged, and it is more convenient to set a filtering mechanism to filter the heat transfer oil that is about to enter the spiral oil pipe 25.

[0024] Reference Figure 5 , Figure 7 and Figure 8 , the outer wall of the suction pipe 23 is provided with a plurality of small holes in the secondary storage oil chamber, and the suction pipe 23 is also provided with a socket at the distribution of the small holes, and an anti-blocking mechanism 9 extending horizontally outward is inserted in the socket; the anti-blocking mechanism 9 includes a one-way valve pipe 904 inserted in the socket, and the one-way valve pipe 904 is connected to an externally threaded barrel 901 at one end away from the suction pipe 23, and a piston plate 903 is slidably connected to the circumferential inner wall of the externally threaded barrel 901, and a return spring 902 is fixed between the piston plate 903 and the barrel bottom; a screw hole 152 matching the outer diameter of the externally threaded barrel 901 is provided at one end of the preheating oil tank 15 close to the combustion unit; through the anti-blocking mechanism 9, when the suction capacity of the suction pipe 23 becomes weak, that is, when the small holes on its surface may be blocked, it is only necessary to suddenly hit the piston plate 903 into the barrel to allow the suction pipe 23 to generate oil pressure from the inside to the outside, and then the small holes can be dredged to ensure the normal suction capacity of the suction pipe 23.

[0025] Reference Figure 5-Figure 6 A smoke exhaust pipe 12 is fixed to one end of the burn-resistant inner tube 22 away from the combustion unit, and a fixed seat is fixed to the surface of the eccentric retaining ring 151 below the smoke exhaust pipe 12, the oil pump 18 is detachably fixedly connected to the top of the fixed seat, and a heat-resistant transfer tube 19 is connected between the oil inlet end of the oil pump 18 and the end of the spiral oil pipe 25; an arc-shaped support plate 16 is fixed to the outer wall of the preheating oil tank 15 near the bottom end, and two symmetrical grooved slide rails 105 are fixed to the circumferential inner wall of the outer cylinder 1 near the bottom end, the arc-shaped support plate 16 is slidably connected in the grooved slide rail 105, and a power outlet pipe 17 is provided at one end of the oil pump 18 away from the heat-resistant transfer tube 19.

[0026] Reference Figure 5Both ends of the preheating oil tank 15 are provided with self-locking threaded holes near the bottom, and plugs 24 are screwed into the two self-locking threaded holes; through the provided plugs 24, the oily dirt at the bottom can be discharged regularly.

[0027] Reference Figure 5-Figure 6 A slag discharge hole 103 is opened on the circumferential outer wall of the outer cylinder 1 between the two groove-shaped slide rails 105, and the position of the slag discharge hole 103 is adapted to the position of the plug 24; a side observation window 102 is opened on the circumferential outer wall of the outer cylinder 1 near the front, and the position of the side observation window 102 is adapted to the position of the anti-blocking mechanism 9, and the piston plate 903 can be knocked through the side observation window 102, thereby facilitating the dredging of the small hole of the suction pipe 23.

[0028] Reference Figure 1 , Figure 3 , Figure 6 and Fig.10 A notch 7 is provided near the top of one end of the outer cylinder 1 close to the combustion unit, and a horizontally extending fixing platform 104 is reserved at the bottom of the notch 7. Mutually symmetrical hinged ear plates 10 are fixed to both sides of the circumferential outer wall of the outer cylinder 1 close to the fixing platform 104. Two mutually symmetrical L-shaped support frames 3 are rotatably connected between the two hinged ear plates 10. The same fixing clamp 5 is fixed to one end of the two L-shaped support frames 3 away from the hinged ear plates 10, and a storage oil barrel 4 with a cylindrical structure with an internal cavity is clamped in the middle of the fixing clamp 5; the outer diameters of the storage oil barrel 4 and the fixing clamp 5 are smaller than the width of the notch passing through the notch 7, so that they can be folded and stored inside the outer cylinder 1, which is more convenient for storage and transportation. The upper surface of the fixing platform 104 is provided with a device for flipping up the storage oil barrel 4 and the fixing clamp 5. The storage oil barrel 4 is fixed with a latch mechanism 21, and the latch mechanism 21 includes a turntable 2101 rotatably connected to the middle part of the upper surface of the fixed platform 104, and two connecting rod push rods 2102 rotatably connected to the upper surface of the turntable 2101 near the edge are symmetrically distributed with the center; the upper surface of the fixed platform 104 is provided with L-shaped rails 2104 facing the hinged ear plate 10 on the side near the front and rear edges, and sliding latches 2103 are slidably connected in the two groups of L-shaped rails 2104; the ends of the two connecting rod push rods 2102 away from the turntable 2101 are respectively hinged on the upper surfaces of the corresponding sliding latches 2103; by rotating the turntable 2101, the two sliding latches 2103 can be pushed out at the same time, and then the two flipped L-shaped support frames 3 can be fixed.

[0029] Reference Figure 1-Figure 2 , Figure 5The outer wall of the storage oil barrel 4 is respectively connected with a cold oil inlet pipe 13 and a pressure difference oil outlet pipe near the upper and lower ends, and a connecting hose 2 is sleeved at the pipe mouth of the pressure difference oil outlet pipe; a strip sliding hole 101 is opened at the top of the outer cylinder 1 near the fixed platform 104, and a vertical pipe 20 connected to the secondary storage oil chamber is connected to the outer wall of the preheating oil tank 15 near the top, and the top of the vertical pipe 20 is connected to the other end of the connecting hose 2, so as to supply oil to the secondary storage oil chamber, ensuring that the secondary storage oil chamber is always in a fully loaded state, and once again ensuring that there is no empty burning phenomenon in the spiral oil pipe 25, which plays a safety role in the device.

[0030] Reference Figure 1 Two vertical auxiliary support rods 6 are slidably inserted at one end of the circumferential outer wall of the fixed clamping ring 5 away from the fixed platform 104, and the outer wall of the auxiliary support rod 6 is provided with a positioning pin, and the inner wall of the outer cylinder 1 is fixed with fixed blocks 8 at the edges on both sides of the notch 7, and the opposite sides of the two fixed blocks 8 are inserted with a groove-shaped support plate for supporting the auxiliary support rod 6 in the sliding groove; it has the effect of auxiliary support for the storage oil barrel 4 and reduces the pressure of the latch mechanism 21.

[0031] Working principle: When the device is in use, the storage oil barrel 4 together with the two L-shaped support frames 3 are flipped to the top of the outer tube 1, and then the latch mechanism 21 is operated to lock the L-shaped support frame 3, and then the two grooved support plates are pulled out to support the auxiliary support rod 6; then the connecting hose 2 is connected, and then the heat transfer oil can be slowly added from the cold oil inlet pipe 13 near the top of the storage oil barrel 4. At this time, the added heat transfer oil will first flow into the preheating oil tank 15. When the oil in the preheating oil tank 15 exceeds about half, the oil pump 18 can be started. When the power outlet pipe 17 of the oil pump 18 discharges oil, it means that the spiral oil pipe 25 is full of oil. At this time, the burner 14 can be ignited to heat the spiral oil pipe 25. At the same time, the heat transfer oil filling of the storage oil barrel 4 continues until the storage oil barrel 4 is filled; after that, when the oil temperature reaches the predetermined temperature, it can be connected to each heat unit, and the return pipe of the heat unit is connected to the cold oil inlet pipe 13 to form a cycle.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A heat transfer oil furnace for extracting citrus essential oil, comprising an outer cylinder (1) of a tubular structure placed horizontally as a whole, four support columns (11) being fixed to the outer wall of the outer cylinder (1) near the bottom, characterized in that: The inner wall of the outer cylinder (1) is slidably connected to a preheating oil tank (15), and the axis of the preheating oil tank (15) is parallel to the axis of the outer cylinder (1); a fire-resistant inner tube (22) is inserted in the middle of the preheating oil tank (15) and connected to both ends of the preheating oil tank (15); and a chamber formed between the circumferential outer wall of the fire-resistant inner tube (22) and the circumferential inner wall of the preheating oil tank (15) is a secondary oil storage chamber; a combustion unit is arranged at one end of the fire-resistant inner tube (22); and a spiral oil pipe (25) having a conical spring-like structure is fixed inside the fire-resistant inner tube (22); one end of the spiral oil pipe (25) close to the combustion unit is connected to a suction pipe (23) inserted into the secondary oil storage chamber, and the other end of the spiral oil pipe (25) is provided with an oil pump (18).

2. The thermal oil furnace for extracting citrus essential oil according to claim 1, characterized in that: The combustion unit comprises a burner fixing cover (2201) which is detachably fixedly connected to the pipe mouth of the fire-resistant inner pipe (22), and a burner (14) is inserted and fixed in the middle of the burner fixing cover (2201).

3. The thermal oil furnace for extracting citrus essential oil according to claim 1, characterized in that: The burn-resistant inner tube (22) is not concentric with the preheating oil tank (15), and the centerline of the burn-resistant inner tube (22) is located above the centerline of the preheating oil tank (15); an eccentric retaining ring (151) is fixed to one end of the preheating oil tank (15) away from the combustion unit; and a plurality of radially distributed heat conducting plates (2202) are fixed to the circumferential outer wall of the burn-resistant inner tube (22).

4. The thermal oil furnace for extracting citrus essential oil according to claim 3, characterized in that: The outer wall of the suction pipe (23) is provided with a plurality of small holes located in the secondary oil storage chamber, and the suction pipe (23) is provided with a plug hole located at the distribution position of the small holes, and a horizontally outwardly extending anti-blocking mechanism (9) is inserted into the plug hole; the anti-blocking mechanism (9) comprises a one-way valve pipe (904) inserted into the plug hole, and the one end of the one-way valve pipe (904) away from the suction pipe (23) is connected to an externally threaded barrel (901), the circumferential inner wall of the externally threaded barrel (901) is slidably connected to a piston plate (903), and a return spring (902) is fixed between the piston plate (903) and the barrel bottom; and a screw hole (152) matching the outer diameter of the externally threaded barrel (901) is provided at one end of the preheating oil tank (15) close to the combustion unit.

5. The thermal oil furnace for extracting citrus essential oil according to claim 4, characterized in that: A smoke exhaust pipe (12) is fixed to one end of the fire-resistant inner tube (22) away from the combustion unit, and a fixing seat is fixed to the surface of the eccentric retaining ring (151) located below the smoke exhaust pipe (12), the oil pump (18) is detachably fixedly connected to the top of the fixing seat, and a heat-resistant transfer pipe (19) is connected between the oil inlet end of the oil pump (18) and the end of the spiral oil pipe (25); an arc-shaped support plate (16) is fixed to the outer wall of the preheating oil tank (15) near the bottom end, and two mutually symmetrical grooved slide rails (105) are fixed to the circumferential inner wall of the outer cylinder (1) near the bottom end, the arc-shaped support plate (16) is slidably connected to the grooved slide rail (105), and a power outlet pipe (17) is provided at one end of the oil pump (18) away from the heat-resistant transfer pipe (19).

6. The thermal oil furnace for extracting citrus essential oil according to claim 5, characterized in that: Both ends of the preheating oil tank (15) are provided with self-locking threaded holes near the bottom, and plugs (24) are screwed into the two self-locking threaded holes.

7. The thermal oil furnace for extracting citrus essential oil according to claim 6, characterized in that: A slag discharge hole (103) is formed on the circumferential outer wall of the outer cylinder (1) between the two groove-shaped slide rails (105), and the position of the slag discharge hole (103) matches the position of the first plug (24); a side observation window (102) is formed on the circumferential outer wall of the outer cylinder (1) near the front, and the position of the side observation window (102) matches the position of the anti-blocking mechanism (9).

8. The thermal oil furnace for extracting citrus essential oil according to claim 1, characterized in that: A through notch (7) is provided near the top of one end of the outer cylinder (1) close to the combustion unit, and a horizontally extending fixing platform (104) is reserved at the bottom of the through notch (7). Mutually symmetrical hinged ear plates (10) are fixed to the two sides of the circumferential outer wall of the outer cylinder (1) close to the fixing platform (104), and two mutually symmetrical L-shaped support frames (3) are rotatably connected between the two hinged ear plates (10). The two L-shaped support frames (3) are fixed with a same fixing clamp (5) at one end away from the hinged ear plates (10), and a storage oil barrel (4) with a cylindrical structure having an internal cavity is clamped in the middle of the fixing clamp (5); the outer diameters of the storage oil barrel (4) and the fixing clamp (5) are smaller than the width of the notch through the notch (7); the fixing platform (104) ) is provided on the upper surface of the fixing platform (104) for fixing the turned-up storage oil barrel (4), and the latch mechanism (21) comprises a turntable (2101) rotatably connected to the middle of the upper surface of the fixing platform (104), and two connecting rod push rods (2102) rotatably connected to the upper surface of the turning plate (2101) near the edge thereof and distributed symmetrically with the center; the upper surface of the fixing platform (104) is provided with L-shaped rails (2104) facing the hinged ear plate (10) on the side near the front and rear edges, and sliding latches (2103) are slidably connected to the two sets of L-shaped rails (2104); the ends of the two connecting rod push rods (2102) away from the turntable (2101) are respectively hinged to the upper surfaces of the corresponding sliding latches (2103).

9. The thermal oil furnace for extracting citrus essential oil according to claim 8, characterized in that: The outer wall of the storage oil barrel (4) is respectively connected with a cold oil inlet pipe (13) and a pressure differential oil outlet pipe near the upper and lower ends, and a connecting hose (2) is sleeved at the pipe mouth of the pressure differential oil outlet pipe; the top of the outer cylinder (1) is provided with a strip-shaped sliding hole (101) near the fixing platform (104), and the outer wall of the preheating oil tank (15) is connected with a vertical pipe (20) connected to the secondary storage oil chamber near the top, and the top of the vertical pipe (20) is connected to the other end of the connecting hose (2).

10. The thermal oil furnace for extracting citrus essential oil according to claim 8, characterized in that: Two vertical auxiliary support rods (6) are slidably inserted into one end of the circumferential outer wall of the fixed clamp ring (5) away from the fixed platform (104), and fixed blocks (8) are fixed to the inner wall of the outer cylinder (1) at both side edges passing through the notch (7), and groove-shaped support plates for supporting the auxiliary support rods (6) are inserted into the sliding grooves on the opposite sides of the two fixed blocks (8).

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