An inverted cone distillation apparatus for essential oil extraction

Abstract

The utility model discloses a kind of inverted conical distillation device for essential oil extraction, including inverted conical extraction system, condensing recovery system and vacuum system that are sequentially communicated, cooling water system respectively with condensing recovery system and vacuum system intercommunication, and controller respectively with inverted conical extraction system, condensing recovery system, vacuum system and cooling water system are connected, inverted conical extraction system is used to evaporate essential oil in extraction plant to obtain steam containing essential oil, condensing recovery system is used to condense steam and separate essential oil and distilled water, vacuum system is used to drive steam directional flow and reduce essential oil evaporation temperature, cooling water system is used to provide cooling medium for condensing recovery system and vacuum system. The utility model compares with traditional distillation kettle, improve essential oil yield, shorten distillation time, reduce energy consumption, significantly improve the economic benefit and environmental protection performance of essential oil extraction.

Description

Technical Field

[0001] This utility model relates to the technical field of essential oil extraction equipment, and in particular to an inverted conical distillation device for essential oil extraction. Background Technology

[0002] Eucalyptus oil is an important natural plant essential oil widely used in medicine, cosmetics, food, and other fields. Currently, the main extraction method for eucalyptus oil is steam distillation. While this method is simple to operate, it suffers from low extraction efficiency and high energy consumption. With the increasing demand for eucalyptus oil, developing efficient and energy-saving eucalyptus oil extraction equipment is of great significance.

[0003] In existing technologies, plant essential oil extraction equipment typically includes an extraction tank, a condensation system, and a separation device. However, existing eucalyptus essential oil extraction equipment still suffers from the following technical problems: 1. Traditional eucalyptus oil extraction distillation pots use a top-feeding and top-discharging structure, requiring the use of an electric hoist to lift the inner liner of the distillation pot for loading and slag removal. This process is complex, labor-intensive, and has low production efficiency.

[0004] 2. Conventional distillation processes require the eucalyptus branches and leaves to be crushed and pre-treated. This increases labor costs and also causes loss of essential oils during the crushing process, reducing the overall yield of essential oils.

[0005] 3. Traditional equipment uses boiler steam as a carrier, and the distilled water will carry away some of the essential oil, making it impossible to achieve good recovery. This also results in low essential oil yield and increases the amount and cost of wastewater treatment.

[0006] 4. Conventional distillation pots use direct steam heating, which makes it impossible to dry the residue after extraction, affecting production efficiency and economic benefits.

[0007] 5. Traditional distillation pots have a complex internal structure, usually equipped with heating coils and other components, which reduces the effective filling space and the single batch processing capacity.

[0008] Therefore, it is necessary to develop a eucalyptus essential oil extraction device with a reasonable structure, simple operation, low energy consumption, and high extraction efficiency to solve the above-mentioned technical problems. Utility Model Content

[0009] The purpose of this invention is to address the shortcomings of existing eucalyptus oil extraction equipment, such as high oil loss, low energy utilization, low production efficiency, and environmental pollution, by providing an inverted conical distillation device for oil extraction.

[0010] To achieve the above objectives, the technical solution proposed by this utility model is as follows: An inverted conical distillation apparatus for essential oil extraction includes an inverted conical extraction system, a condensation recovery system connected to the inverted conical extraction system, a vacuum system connected to the condensation recovery system, a cooling water system connected to both the condensation recovery system and the vacuum system, and a controller connected to the inverted conical extraction system, the condensation recovery system, the vacuum system, and the cooling water system. The inverted conical extraction system is used to evaporate and extract essential oils from plants to obtain vapor containing essential oils. The condensation recovery system is used to condense the vapor and separate the essential oils from distilled water. The vacuum system is used to drive the directional flow of the vapors and reduce the evaporation temperature of the essential oils. The cooling water system is used to provide a cooling medium for the condensation recovery system and the vacuum system.

[0011] Preferably, the inverted conical extraction system includes an inverted conical distillation pot, a sealing cap, an automatic unloading and slag removal mechanism, and a heating jacket. The inverted conical distillation pot has a feed inlet and a steam outlet at the top, and a discharge outlet at the bottom. The sealing cap is installed on the top of the inverted conical distillation pot to open and close the feed inlet. The automatic unloading and slag removal mechanism is installed at the bottom of the inverted conical distillation pot to open and close the discharge outlet. The heating jacket is connected to the periphery of the inverted conical distillation pot to heat it. The steam outlet is connected to a vacuum system. The inverted conical structure of the distillation pot allows the residue to be more easily discharged from the bottom under its own weight, saving labor costs compared to traditional distillation pots. Simultaneously, the top-feed and bottom-discharge method reduces dead zones for material retention, improves distillation uniformity, and ensures more complete extraction of essential oils.

[0012] Preferably, the automatic unloading and slag discharge mechanism includes a bottom cover, a locking cylinder, a locking cylinder hinge seat, a latch, a latch hinge seat, a cover opening / closing cylinder, a cover opening / closing cylinder hinge seat, a pressure rod, and a pressure rod hinge seat; the cover opening / closing cylinder hinge seat and the pressure rod hinge seat are fixed to one side of the inverted conical distillation pot, the pressure rod hinge seat is located below the cover opening / closing cylinder hinge seat, one end of the pressure rod is hinged to the pressure rod hinge seat, and the other end is fixedly connected to the bottom cover; the cover opening / closing cylinder hinge seat... The cylinder body is hinged to the switch cover cylinder hinge seat, and its output end is hinged to the pressure rod. The locking cylinder hinge seat and the latch hinge seat are fixed to the other side of the inverted conical distillation pot. The latch hinge seat is located below the locking cylinder hinge seat. One end of the latch is hinged to the latch hinge seat, and the other end is used to press the bottom cover after the bottom cover closes the outlet of the inverted conical distillation pot. The cylinder body of the locking cylinder is hinged to the locking cylinder hinge seat, and its output end is hinged to the latch. The automatic unloading and slag removal mechanism can reduce the labor intensity of operators and reduce operational risks.

[0013] Preferably, a cavity for the heating medium is formed between the heating jacket and the inverted conical distillation pot. The heating jacket has a heating medium inlet at the bottom and a heating medium outlet at the top. A regulating valve connected to a controller is installed at the heating medium inlet, and a temperature sensor connected to the controller is also installed in the heating jacket. The heating jacket achieves indirect and uniform heating, avoiding localized overheating, and facilitates the drying of waste residue, improving energy efficiency. After online drying, the waste residue can be directly used as boiler fuel, achieving resource recycling.

[0014] Preferably, the condensation recovery system includes a condenser connected to the inverted cone extraction system and the cooling water system respectively, an oil-water separator connected to the condenser, and a re-distillation water circulation pipeline connecting the oil-water separator and the inverted cone extraction system.

[0015] Preferably, the top of the oil-water separator is provided with an essential oil collection port connected to the condenser and a vacuum port connected to the vacuum system; the bottom of the oil-water separator is provided with a discharge port for discharging material and a return port connected to the re-distillation water circulation pipeline; a visual discharge valve is installed on the discharge port; a switch valve is installed on the re-distillation water circulation pipeline; and a first liquid level sensor is installed inside the oil-water separator.

[0016] Preferably, the vacuum system includes a vacuum condenser connected to an oil-water separator and a cooling water system, a vacuum buffer tank connected to the vacuum condenser, and a reciprocating vacuum pump connected to the vacuum buffer tank; the vacuum buffer tank is equipped with a vacuum sensor connected to a controller.

[0017] By adopting the above technical solution, the beneficial effects of this utility model are as follows: This invention utilizes a vacuum system to lower the evaporation temperature, accelerating the evaporation rate of essential oils, thereby improving distillation efficiency and essential oil quality. A condensation recovery system enhances energy utilization, reduces wastewater discharge, and minimizes environmental pollution. Compared to traditional distillation pots, this invention increases essential oil yield, shortens distillation time, reduces energy consumption, and significantly improves the economic benefits and environmental performance of essential oil extraction. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0019] Figure 2 for Figure 1 A schematic diagram of the automatic unloading and slag removal mechanism.

[0020] The components include: 1. Inverted conical extraction system; 11. Inverted conical distillation pot; 111. Feed inlet; 112. Discharge outlet; 113. Steam outlet; 12. Sealing cover; 13. Automatic unloading and slag removal mechanism; 131. Bottom cover; 132. Locking cylinder; 133. Locking cylinder hinge seat; 134. Lock; 135. Lock hinge seat; 136. Cover opening and closing cylinder; 137. Cover opening and closing cylinder hinge seat; 138. Pressure rod; 139. Pressure rod hinge seat; 14. Heating jacket; 141. Heat medium inlet; 142. Heat medium outlet; 143. Regulating valve; 144. Temperature sensor. 2. Condensation recovery system; 21. Condenser; 22. Oil-water separator; 221. Essential oil collection port; 222. Vacuum port; 223. Discharge port; 224. Return port; 23. Re-distilled water circulation pipeline; 24. Visual discharge valve; 25. Switch valve; 26. First liquid level sensor; 3. Vacuum system; 31. Vacuum condenser; 32. Vacuum buffer tank; 33. Reciprocating vacuum pump; 34. Vacuum sensor; Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] This utility model discloses an inverted conical distillation apparatus for essential oil extraction. Figure 1 A schematic diagram of an embodiment of this utility model is shown, which includes an inverted cone extraction system 1, a condensation recovery system 2, a vacuum system 3, a cooling water system (not shown in the figure), and a controller (not shown in the figure). The inverted cone extraction system 1 is used to evaporate and extract essential oils from plants to obtain vapor containing essential oils; the condensation recovery system 2 is connected to the inverted cone extraction system 1 and is used to condense the vapor and separate the essential oils and distilled water; the vacuum system 3 is connected to the condensation recovery system 2 and is used to drive the directional flow of vapors and reduce the evaporation temperature of the essential oils; the cooling water system is connected to both the condensation recovery system 2 and the vacuum system 3, and is used to provide a cooling medium for both systems; the controller is connected to the inverted cone extraction system 1, the condensation recovery system 2, the vacuum system 3, and the cooling water system, and is used to automatically control the entire extraction process. An industrial-grade programmable logic controller (PLC) can be used, and a human-machine interface can be configured.

[0022] In some embodiments of this utility model, the inverted conical extraction system 1 includes an inverted conical distillation pot 11, a sealing cover 12, an automatic unloading and slag discharge mechanism 13, and a heating jacket 14.

[0023] The inverted conical distillation pot 11 adopts a structural design that is smaller at the top and larger at the bottom, with an overall inverted conical shape. It is preferably made of stainless steel, which has good corrosion resistance and thermal conductivity. The inverted conical distillation pot 11 has a feed inlet 111 and a steam outlet 113 at the top, and a discharge outlet 112 at the bottom. The top-feeding and bottom-discharging design of the distillation pot allows the material to flow naturally under the action of gravity, reducing energy consumption and improving working efficiency.

[0024] The top feed inlet 111 is equipped with a sealing cap 12, which can be connected to the inverted conical distillation vessel 11 by bolts, quick-locking devices, etc., to ensure good sealing during the extraction process.

[0025] The bottom discharge port 112 is equipped with an automatic unloading and slag removal mechanism 13, combined with Figure 2 The mechanism includes a bottom cover 131, a locking cylinder 132, a locking cylinder hinge seat 133, a latch 134, a latch hinge seat 135, a cover-opening cylinder 136, a cover-opening cylinder hinge seat 137, a pressure rod 138, and a pressure rod hinge seat 139. The cover-opening cylinder hinge seat 137 and the pressure rod hinge seat 139 are fixed to one side of the inverted conical distillation pot 11. The pressure rod hinge seat 139 is located below the cover-opening cylinder hinge seat 137. One end of the pressure rod 138 is hinged to the pressure rod hinge seat 139, and the other end is fixedly connected to the bottom cover 131. The cylinder body of the cover-opening cylinder 136 is hinged to the cover-opening cylinder hinge seat 137, and its output end is hinged to the pressure rod 138. Locking cylinder hinge seat 133 and locking latch hinge seat 135 are fixed on the other side of the inverted conical distillation pot 11. Locking latch hinge seat 135 is located below locking cylinder hinge seat 133. One end of the latch 134 is hinged to the locking latch hinge seat 135, and the other end is used to lock the bottom cover 131 after the bottom cover 131 closes the outlet 112 of the inverted conical distillation pot 11. The cylinder body of locking cylinder 132 is hinged to locking cylinder hinge seat 133, and its output end is hinged to latch 134. When the bottom cover 131 is opened, the locking cylinder 132 first exhausts and retracts, opening the latch 134. Then the cover opening and closing cylinder 136 exhausts and retracts, driving the bottom cover 131 to open via the pressure rod 138. When the bottom cover 131 is closed, the cover opening and closing cylinder 136 extends and takes in air, driving the bottom cover 131 to close via the pressure rod 138. Then the locking cylinder 132 extends and takes in air, closing the latch 134 and locking it.

[0026] To facilitate the handling of waste residue, it is preferable to use a waste residue collection container to collect the waste residue. To make it easier to collect the waste residue, a funnel-shaped slag discharge hopper can be equipped on the waste residue collection container to guide the waste residue out.

[0027] A heating jacket 14 surrounds the inverted conical distillation vessel 11, providing indirect heating. A cavity is formed between the heating jacket 14 and the inverted conical distillation vessel 11 for the passage of the heating medium. The heating jacket 14 is preferably made of stainless steel. A heating medium inlet 141 is located at the bottom of the heating jacket 14, and a heating medium outlet 142 is located at the top, forming a circulation channel for the heating medium. The heating medium can be hot water or heat transfer oil, circulated by a circulation pump. A regulating valve 143 connected to a controller is installed at the heating medium inlet 141 to control the flow of the heating medium. A temperature sensor 144 connected to the controller is configured in the heating jacket 14 to monitor the heating temperature, with a temperature control range of 30℃ to 150℃ and an accuracy of ±1℃. To reduce heat loss and improve energy efficiency, the surface of the heating jacket 14 can be covered with heat-insulating material.

[0028] In some embodiments of this utility model, the condensation recovery system 2 includes a condenser 21 connected to the inverted cone extraction system 1 and the cooling water system, an oil-water separator 22 connected to the condenser 21, and a re-distilled water circulation pipeline 23 connecting the oil-water separator 22 and the inverted cone extraction system 1.

[0029] The condenser 21 adopts a shell-and-tube structure, preferably made of stainless steel. Multiple condenser tubes are installed inside the condenser 21, with cooling water channels outside the tubes. It has a cooling water inlet and outlet connected to the cooling water system. Cooling water enters from the bottom and flows out from the top, forming counter-current heat exchange. The operating temperature range of the condenser 21 is 5℃~40℃, and the cooling water flow rate is 2m³ / h. Steam is condensed into condensate in the condenser 21.

[0030] The oil-water separator 22 employs gravity separation. Due to density differences, the condensate separates into two layers inside the separator: an upper layer of essential oil and a lower layer of distilled water. The top of the separator 22 has an essential oil collection port 221 connected to the condenser 21 and a vacuum port 222 connected to the vacuum system 3. The bottom of the separator 22 has a discharge port 223 for discharging material and a return port 224 connected to the re-distilled water circulation pipeline 23. The re-distilled water circulation pipeline 23 circulates distilled water back to the inverted conical distillation pot 11. A switch valve 25, such as a pneumatic ball valve, is installed on the re-distilled water circulation pipeline 23. A first liquid level sensor 26, such as a magnetic float remote liquid level gauge, is installed inside the separator 22. This sensor monitors the liquid level inside the separator 22. When the liquid level exceeds the preset height of the return port 224, the controller opens the switch valve 25 to allow the distilled water to flow back to the inverted conical distillation pot 11. A visual discharge valve 24 is installed on the discharge port 223 to discharge bottom water impurities and essential oil after production. When the essential oil is observed to flow out through the visual discharge valve 24, the essential oil collection device is switched to collect the essential oil.

[0031] In some embodiments of this utility model, the vacuum system 3 includes a vacuum condenser 31 connected to the oil-water separator 22 and the cooling water system, a vacuum buffer tank 32 connected to the vacuum condenser 31, and a reciprocating vacuum pump 33 connected to the vacuum buffer tank 32. The structure of the vacuum condenser 31 is the same as that of the condenser 21, and will not be described again here.

[0032] In one embodiment of this invention, the reciprocating vacuum pump 33 has a pumping speed of 20 m³ / h, an ultimate vacuum of 1 Pa, and a power of 2.2 kW. The vacuum buffer tank 32 can be made of stainless steel, with a volume of 100 L, a diameter of 400 mm, a height of 800 mm, and a design pressure of -0.1 MPa. The vacuum buffer tank 32 is equipped with a vacuum sensor 34, whose measurement range is 0 to 100 kPa. The application of the vacuum system 3 can reduce the extraction temperature to the range of 80°C to 90°C, effectively protecting the heat-sensitive essential oil components from damage.

[0033] The cooling water system can be an existing product. In some embodiments of this utility model, the cooling water system includes a water tank, cooling water circulation pipes connected to the water tank, the condensate recovery system 2, and the vacuum system 3, a filter installed on the cooling water circulation pipes, and a water pump. The water tank is used to store cooling water and is equipped with a second liquid level sensor to monitor the water level. It is also equipped with a cooler and a heater to control the water temperature, which can be controlled within the range of 20℃ to 30℃. The water pump is used to pressurize the cooling water in the water tank and deliver it to the condenser 21 and the vacuum condenser 31 for heat exchange. The filter is used to ensure that the cooling water system is unobstructed.

[0034] In one embodiment of this utility model, the water pump is a centrifugal pump with a power of 1.5kW, a flow rate of 3m³ / h, and a head of 20m. The filter adopts a multi-stage filtration design, including a primary filter and a fine filter. The primary filter has a filtration accuracy of 100μm, and the fine filter has a filtration accuracy of 10μm.

[0035] The operation of the inverted conical distillation apparatus for essential oil extraction in this embodiment is as follows: First, plant materials are added to the inverted conical distillation pot 11 through the feed inlet 111 at the top of the pot, along with a certain level of distilled water, and the sealing cap 12 is closed. Next, the heating jacket 14 is activated to heat the inverted conical distillation pot 11, setting the temperature within an appropriate range (typically 90℃~100℃). Simultaneously, the vacuum system 3 is activated to reduce the internal pressure of the inverted conical distillation pot 11 to an appropriate level (typically 60kPa~80kPa). Under heating and depressurization conditions, the essential oils in the plant materials begin to volatilize, entering the condensation recovery system 2 along with water vapor through the outlet pipe at the top of the inverted conical distillation pot 11. In the condenser 21, the vapor is cooled and condensed into liquid, flowing into the oil-water separator 22. Due to the density difference between essential oil and water, the essential oil floats on the water surface. When the liquid level in the oil-water separator 22 exceeds the preset height of the return port 224 (e.g., 10 cm), a liquid level signal is transmitted to the controller. The controller then opens the switch valve 25 on the re-distilled water circulation pipeline 23, causing the bottom distilled water to rise with the liquid level and circulate back to the distillation pot for reheating and volatilization of the distilled material, forming an internal water circulation distillation process. When no essential oil is produced at the end of distillation, the switch valve 25 is closed. Extraction is complete when no liquid is discharged from the visible discharge valve 24. The heating system and vacuum system 3 are then turned off. After the temperature inside the distillation pot drops to a safe temperature, the automatic unloading and slag discharge mechanism 13 is activated, the bottom cover 131 is opened, and the waste residue is discharged into the waste residue collection container. The entire extraction process is automatically monitored and adjusted by the controller to ensure extraction efficiency and product quality.

[0036] Compared with traditional distillation pots, this invention can increase the essential oil yield by about 8-10%, shorten the distillation time by 20-30%, and reduce energy consumption by 15-20%, significantly improving the economic benefits and environmental performance of eucalyptus essential oil extraction.

[0037] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims are within the scope of protection of the present invention.

Claims

1. An inverted conical distillation apparatus for essential oil extraction, characterized in that, include: An inverted cone-shaped extraction system (1) is used to evaporate and extract essential oils from plants to obtain vapor containing essential oils; The condensation recovery system (2) is connected to the inverted cone extraction system (1) and is used to condense the steam and separate the essential oil and distilled water; A vacuum system (3) is connected to the condensation recovery system (2) and is used to drive the directional flow of the steam and reduce the evaporation temperature of the essential oil; The cooling water system is connected to the condensation recovery system (2) and the vacuum system (3) respectively, and is used to provide cooling medium for the condensation recovery system (2) and the vacuum system (3); The controller is connected to the inverted cone extraction system (1), the condensation recovery system (2), the vacuum system (3), and the cooling water system, respectively.

2. The inverted conical distillation apparatus for essential oil extraction according to claim 1, characterized in that, The inverted conical extraction system (1) includes: an inverted conical distillation pot (11), a sealing cover (12), an automatic unloading and slag removal mechanism (13), and a heating jacket (14); the inverted conical distillation pot (11) has a feed inlet (111) and a steam outlet (113) at the top and a discharge outlet (112) at the bottom; the sealing cover (12) is installed on the top of the inverted conical distillation pot (11) and is used to open and close the feed inlet (111); the automatic unloading and slag removal mechanism (13) is installed on the bottom of the inverted conical distillation pot (11) and is used to open and close the discharge outlet (112); the heating jacket (14) is connected to the periphery of the inverted conical distillation pot (11) and is used to heat the inverted conical distillation pot (11); the steam outlet (113) is used to connect to the vacuum system (3).

3. The inverted conical distillation apparatus for essential oil extraction according to claim 2, characterized in that, The automatic unloading and slag discharge mechanism (13) includes: a bottom cover (131), a locking cylinder (132), a locking cylinder hinge seat (133), a latch (134), a latch hinge seat (135), a cover opening cylinder (136), a cover opening cylinder hinge seat (137), a pressure rod (138), and a pressure rod hinge seat (139). The switch cover cylinder hinge seat (137) and the pressure rod hinge seat (139) are fixed on one side of the inverted conical distillation pot (11). The pressure rod hinge seat (139) is located below the switch cover cylinder hinge seat (137). One end of the pressure rod (138) is hinged to the pressure rod hinge seat (139), and the other end is fixedly connected to the bottom cover (131). The cylinder body of the switch cover cylinder (136) is hinged to the switch cover cylinder hinge seat (137), and its output end is hinged to the pressure rod (138). The locking cylinder hinge seat (133) and the locking buckle hinge seat (135) are fixed on the other side of the inverted conical distillation pot (11). The locking buckle hinge seat (135) is located below the locking cylinder hinge seat (133). One end of the locking buckle (134) is hinged to the locking buckle hinge seat (135), and the other end is used to lock the bottom cover (131) after the bottom cover (131) closes the outlet (112) of the inverted conical distillation pot (11). The cylinder body of the locking cylinder (132) is hinged to the locking cylinder hinge seat (133), and its output end is hinged to the locking buckle (134).

4. The inverted conical distillation apparatus for essential oil extraction according to claim 2, characterized in that, The heating jacket (14) and the inverted conical distillation pot (11) form a cavity through which the heating medium passes. The heating jacket (14) has a heating medium inlet (141) at the bottom and a heating medium outlet (142) at the top. The heating medium inlet (141) is equipped with a regulating valve (143) connected to the controller. The heating jacket (14) is equipped with a temperature sensor (144) connected to the controller.

5. The inverted conical distillation apparatus for essential oil extraction according to claim 1, characterized in that, The condensation recovery system (2) includes a condenser (21) connected to the inverted cone extraction system (1) and the cooling water system respectively, an oil-water separator (22) connected to the condenser (21), and a re-distilled water circulation pipeline (23) connecting the oil-water separator (22) and the inverted cone extraction system (1).

6. The inverted conical distillation apparatus for essential oil extraction according to claim 5, characterized in that, The top of the oil-water separator (22) is provided with an essential oil collection port (221) connected to the condenser (21) and a vacuum port (222) connected to the vacuum system (3). The bottom of the oil-water separator (22) is provided with a discharge port (223) for discharging material and a return port (224) connected to the re-distilled water circulation pipeline (23). A visual discharge valve (24) is installed on the discharge port (223), a switch valve (25) is installed on the re-distillation water circulation pipeline (23), and a first liquid level sensor (26) is installed inside the oil-water separator (22).

7. The inverted conical distillation apparatus for essential oil extraction according to claim 1, characterized in that, The vacuum system (3) includes a vacuum condenser (31) connected to the oil-water separator (22) and the cooling water system, a vacuum buffer tank (32) connected to the vacuum condenser (31), and a reciprocating vacuum pump (33) connected to the vacuum buffer tank (32); the vacuum buffer tank (32) is equipped with a vacuum sensor (34) connected to the controller.

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