TWI386180B - Vacuum frying equipment and the implementation of the equipment frying process - Google Patents

Description

Vacuum frying equipment and food frying process performed by the equipment

The present invention relates to food processing, and more particularly to a vacuum frying apparatus for frying processed foods and a food frying processing process performed by the apparatus.

The vacuum fryer for frying processed foods comprises a frying tank, a top cover and a vacuum pump, wherein the top of the frying tank system forms a vertical tank of the inlet, and the top cover is operated. The top of the frying tank is provided with a positioning frame, and the positioning frame is lifted and lowered according to the lifting device.

When the conventional vacuum fryer is used for food frying processing, the pre-treated food such as washing, slitting (slicing or dicing) is placed in a basket, and then the food is loaded by a hanging device such as a crane. The basket is suspended and placed inside the frying tank, and is positioned on the positioning frame. At this time, an appropriate amount of deep-frying oil (hereinafter referred to as frying oil) is placed inside the frying tank, and the basket is used for positioning. The frame is positioned in the space above the liquid level of the frying oil; then, the top cover is closed to close the frying tank, and the vacuum pump is started to extract the air inside the frying tank through the pipeline to form a vacuum negative pressure state inside the frying tank. And providing heat energy by the heat source to cause the frying oil in the frying tank to heat up to a desired frying temperature; and then, starting the lifting device, the positioning frame carries the basket to sink down into the surface of the frying oil, according to which The food is subjected to frying processing. During the frying process, the vacuum pump continuously operates to extract water vapor generated by the water released by the food; after the frying is completed, the heating of the frying oil is stopped, the vacuum pump stops operating, and the lifting device is actuated The positioning frame carries the basket to rise above At the surface of the frying oil, the intake valve disposed on the top cover is opened, so that outside air enters the frying tank to release the vacuum negative pressure state inside the frying tank; and then, the top cover is opened, and the crane is used The basket is lifted off the fry tank and lifted to a deoiling centrifuge to remove the frying oil remaining on the surface of the food.

Since the frying tank is formed in the vertical tank body at the top end, the basket containing the food must be smoothly inserted into and out of the frying machine by means of a crane or a lifting device having a hanging and moving function. The trough makes the installation location of the conventional vacuum fryer limited. Further, when the food is fried, the food and the net remain in the process of the basket being lifted from the fryer to the deoiling centrifuge. The frying oil on the surface of the basket will drip on the path that the basket is transported to the deoiling centrifuge. Therefore, the food processing industry equipped with the conventional vacuum fryer is mostly in a vacuum fryer and deoiled centrifuge. The oil collecting tank is laid on the lifting path between the machines, so as to collect the oil that is dripping during the lifting process to avoid environmental pollution, but the oil collected by the oil collecting tank is vulnerable to dust in the surrounding environment. The pollution of debris and the inability to recycle and reuse in food frying processing, invisibly reduce the efficiency of the use of frying oil. In addition, during the frying process, the food tends to be partially peeled off into fine fritters, and the scraps are deposited on the bottom of the frying tank through the mesh of the basket, which is easy to accelerate the acidification of the frying oil and reduce the frying. In addition to the service life of the oil, in the process of performing the frying process, the conventional vacuum fryer must allow all the food to be immersed in the frying oil, and the use amount of the frying oil is high.

In view of this, the applicant of the present case actively engaged in creative research and development, and the present invention which is innovative and industrially useful is produced.

The main object of the present invention is to provide a vacuum frying device and a food frying processing process performed by the device, and the vacuum frying device is configured by a preheating tank, a frying tank and an oil filter, and then cooperates with the inside of the frying tank There is a drum that can be rotated, and the vacuum frying device can be used to perform frying and draining, and to improve the utilization rate of the frying oil.

The present invention provides a vacuum frying apparatus comprising a preheating tank, a pipeline system, a frying tank and a pumping unit, wherein: a steam chamber is disposed outside the preheating tank for Steaming the oil in the preheating tank; the oil pipeline comprises a fuel pipe and an oil filter, wherein the oil pipe is connected to the preheating tank and the frying tank respectively, according to the preheating tank and The frying oil is conveyed between the frying tanks, and the two ends of the oil filter are respectively connected to the oil pipeline, and the frying oil is returned from the frying tank to the preheating tank through the oil filter, and the fry is filtered. Extending the service life of the frying oil; the frying tank is a horizontally-shaped circular trough body, the front end of the frying tank is formed with an opening, and a door fan is disposed in the opening, and the feeding material is fed into and out of the frying tank, the oil pipeline and the oil pipeline The bottom of the frying tank is connected, and the frying oil enters the inside of the frying tank. The inside of the frying tank pivots a drum, and the drum forms a funnel-shaped annular guiding surface adjacent to the front end, and the front end of the drum forms an opening. According to the food, the material enters the inside of the drum, and the drum wall runs through the complex a through hole, the rear end axis of the drum pivotally passes through the frying tank and is connected to a driving device for rotating the drum, the drum is internally provided with a plurality of stirring rods, and each of the stirring rods respectively and the inner wall of the drum In combination, the food is used to stir the food to improve the frying efficiency; the frying tank is provided with a heater at the outer bottom edge for maintaining the temperature of the frying oil; the front end of the stirring rod extends at the front end opening of the drum, and the stirring rod The axial direction is inclined with the axial direction of the drum, and the guiding material is moved to the opening of the front end of the drum to complete the discharge of the food material; the air suction unit comprises an air pumping unit and a pipeline system, and the pipeline is connected to the air pumping The unit and the preheating tank and the frying tank respectively pump the preheating tank and the air inside the frying tank by the air pumping unit, thereby changing the internal pressure of the preheating tank and the frying tank, The control frying oil flows between the preheating tank and the frying tank.

The invention provides a food frying processing process executed by the vacuum frying device, the process comprising the following steps: a feeding step: placing the food to be processed into the frying tank; and an oil feeding step: opening the oil pipeline for the preheating The communication between the tank and the frying tank starts the pumping unit to form a negative pressure state of the frying tank relative to the preheating tank, thereby attracting the heated frying oil in the preheating tank to the frying tank When the frying oil level of the frying tank reaches a preset height, closing the communication of the oil pipeline; frying step: frying the food material by preheating the frying oil, and the heater is fried The tank is heated to maintain the temperature of the frying oil, and at the same time, the drum rotates, the drum and the stirring rod are used to stir the food material, so that the parts of the food material are uniformly heated to improve the frying efficiency, and at the same time, the pumping unit continuously extracts The inside air of the frying tank, thereby extracting the water vapor formed by evaporating the moisture content of the food material, and withdrawing the frying tank; and recovering the frying oil step: stopping the extraction of the air inside the frying tank, and starting to extract the air inside the preheating tank To make the preheating tank relatively The frying tank is formed in a relatively negative pressure state, and the preheating tank and the frying tank are in communication with each other through the oil filter, thereby sucking the frying oil through the oil filter to the preheating tank, and according to The oil filter filters out the frying in the frying oil; the draining step: the drum continues to rotate, thereby tumbling the foodstuff, and thereby removing excess frying oil attached to the surface of the foodstuff; and discharging step: stopping the pumping The operation of the unit and the drum, the door leaf is opened, and then the drum is rotated, the food is taken up by the stirring rod, and the food material is slid out of the frying tank toward the front end opening of the frying tank to complete the food frying process.

The objects, features, and advantages of the present invention will be more fully described in the appended claims.

The first drawing is a front view of a preferred embodiment of the vacuum frying apparatus of the present invention.

The second drawing is a plan view of a preferred embodiment of the vacuum frying apparatus of the present invention.

The third drawing is a front view of the fryer of the preferred embodiment of the vacuum frying apparatus of the present invention in the open state of the slot door.

The fourth drawing is a perspective view of a drum of a preferred embodiment of the vacuum frying apparatus of the present invention.

The fifth figure is a partial view of the third figure viewed from the side of the stir bar.

Figure 6 is a perspective view of a stir bar of a preferred embodiment of the vacuum frying apparatus of the present invention.

The seventh drawing is a flow chart of the food frying processing process performed by the vacuum frying apparatus of the present invention.

As shown in the first and second figures, a preferred embodiment of the vacuum frying apparatus of the present invention comprises a preheating tank (10), a tubing system (20), a frying tank (30) and a pumping unit (40). The preheating tank (10) has an oil filling port at the top, and the frying oil (hereinafter referred to as frying oil) is injected into the preheating tank (10) through the oil filling port, the preheating tank (10) a cover (11) is disposed at the oil filling port, thereby closing the oil filling port, and a steam chamber (12) is disposed outside the preheating tank (10), and the steam chamber (12) covers the preheating tank ( 10) The side and the bottom of the steam chamber (12) are provided with a steam pipe (122), which is connected with a steam source (not shown), and the steam source may be selected from a steam boiler, and The steam pipe (122) guides steam into the steam chamber (12), thereby heating the frying oil inside the preheating tank (10), and a drain pipe (124) is connected to the bottom end of the steam chamber (12). This discharged steam releases the water after condensation of thermal energy.

The oil pipeline system (20) is disposed between the preheating tank (10) and the frying tank (30), and accordingly, the frying oil is transported between the preheating tank (10) and the frying tank (30). The oil pipeline system (20) comprises an oil delivery pipe (21), an oil filter (22), a first control valve (23), a second control valve (24) and a drain valve (25), wherein The two ends of the oil delivery pipe (21) are respectively connected with the preheating tank (10) and the frying tank (30), and accordingly, the frying oil is transported between the preheating tank (10) and the frying tank (30). A first connecting pipe (222) is disposed at one end of the oil filter (22), and a second connecting pipe (224) is disposed at the other end. The first connecting pipe (222) and the oil feeding pipe (21) are adjacent to the preheating tank (10) Connected, the second connecting pipe (224) is adjacent to the oil feeding pipe (21) adjacent to the frying tank (30), and the first control valve (23) is disposed at the first connecting pipe (222). To control the communication state between the oil filter (22) and the preheating tank (10), the second control valve (24) is disposed on the oil delivery pipe (21) and located in each of the connecting pipes (222) (224) and Between the junctions of the oil pipelines (21), the state of communication between the preheating tank (10) and the frying tank (30) is controlled, and the drain valve (25) is disposed on the oil pipeline (21). Positioned between the first control valve (23) and the second control valve (24), according to control emissions shortening outwardly.

The frying tank (30) is a horizontally-shaped circular trough body, and the oil feeding pipe (21) is in contact with the bottom of the frying tank (30), and the frying oil is introduced into the frying tank (30), the oil The frying tank (30) is radially converged at a front end to form a funnel shape, an opening is formed at the front end of the frying tank (30), and a door leaf (31) is operated at the opening to close the opening, such as the third and fourth As shown, the inside of the frying tank (30) pivots a drum (32), and the drum (32) is fitted with the frying groove (30) adjacent to the front end to form a funnel-shaped annular guiding surface (322), and The front end of the drum (32) forms an opening, and the food material enters the inside of the drum (32), and the peripheral wall of the drum (32) is distributed through a plurality of through holes (324), and the rear end axis of the drum (32) is pivoted The rear end of the frying tank (30) extends outside and is coupled to a driving device (33) for driving the drum (32) to rotate by the driving device (33), and the drum (32) is internally provided with a plurality of a stirring rod (34), and each of the stirring rods (34) is disposed at a radial opposite of the inner wall of the drum (32), and when the drum (32) is rotated, the stirring rod (34) is used to stir Ingredients, oysters for improving frying efficiency; again, as shown in the first figure Shown, the frying tank (30) provided on the outer bottom edge of a heater (35), by the heater (35) heating the frying tank (30), thereby maintaining the temperature of the frying oil.

As shown in the fifth figure, the rear end of the stirring rod (34) extends at the rear end of the drum (32), the front end of the stirring rod (34) extends at the front end opening of the drum (32), and the stirring rod (34) The axial direction is inclined with the drum (32), thereby guiding the food material to move toward the front end of the drum (32), and the food material for completing the frying process leaves the drum (32).

As shown in the third and fifth and sixth figures, the stirring rod (34) has a guide plate (342) and a side baffle (344), and one side of the guide plate (342) and the drum (32) The side baffle (344) is obliquely formed on the other side of the guide plate (342), and the guide plate (342) and the side baffle (344) respectively extend through the plurality of perforations (346), a front end portion of the stirring rod (34) that is in contact with the guiding surface (322) is bent along the guiding surface (322) toward the axial direction of the drum (32), and the stirring rod is 34) With the rotation of the drum (32), the foodstuff in the drum (32) is agitated to improve the frying efficiency.

The pumping unit (40) comprises a pumping unit (41), a main pipe (42), a condenser (43), a first branch pipe (44) and a second branch pipe (45), wherein the pumping unit The unit (41) is mainly composed of a driving motor (412) connected to a vacuum pump (414), one end of the main pipe (42) is connected to the air extracting unit (41), and the other end is connected to the bottom of the condenser (43). The ends of the branch pipes (44) (45) are respectively connected to the top end of the condenser (43), and the other end of the first branch pipe (44) is at the top end of the preheating tank (10) and the preheating tank (10) In addition, the other end of the second branch pipe (44) is connected to the frying tank (30) at the top end of the frying tank (30), and the first branch pipe (44) is provided with a third control valve (442). The second branch pipe (45) is provided with a fourth control valve (452) for controlling the communication state of each of the branch pipes (44) (45) respectively. The condenser (43) is disposed laterally adjacent to the bottom end. a water inlet (432), the condenser (43) is adjacent to the top end, and is provided with a water outlet (434) laterally, so that the air extraction unit (41) withdraws the preheating tank (10) and the frying tank ( 30) The internal air forms a negative pressure environment inside the preheating tank (10) and the frying tank (30), and is lowered by the condenser (43) Low extraction air temperature and condensation to remove the moisture of the extracted air, to avoid the air with high water content affecting the service life of the pumping unit (41), and the water generated by the condensation is stored at the bottom of the condenser (43) At the end, the user can clear the venting in time; further, the preheating tank (10) is provided with a fifth control valve (13) at the top, and the frying tank (30) is provided with a sixth control valve at the top (36). ), for controlling the internal pressure state of the preheating tank (10) and the frying tank (30).

The process for performing the food frying processing of the aforementioned vacuum frying apparatus of the present invention comprises the following steps:

First, the frying oil preheating step

Closing the first control valve (23), the second control valve (24) and the drain valve (25), blocking the communication state between the preheating tank (10) and the frying tank (30), and then Injecting the frying oil used in the frying process into the preheating tank (10), and blocking the cover (11), the fourth control valve (452) and the fifth control valve (13); When the valve (442) is kept open, the air suction unit (40) is started to extract the air inside the preheating tank (10), and the steam is introduced into the steam chamber (12), and the steam is used as a heat source to make the preheating tank The oil in the (10) is heated to the temperature required for the fried food, and the condensed water generated after the steam in the steam chamber (12) releases the heat is discharged to the outside through the drain (124).

Second, the feeding step

The food to be processed is placed in the frying tank (30), and the door leaf (31) and the sixth control valve (36) are closed to complete the feeding step.

Third, the oil step

Opening the second control valve (24), so that the preheating tank (10) and the frying tank (30) are connected by the oil feeding pipe (21) to open the fourth control valve (452) and the fifth Controlling the valve (13), closing the third control valve (442), thereby extracting the air inside the frying tank (30), and allowing outside air to enter the preheating tank (10) through the fifth control valve (13), At this time, since the frying tank (30) is in a negative pressure state with respect to the preheating tank (10), the negative pressure environment of the frying tank (30) forms an attracting effect on the frying oil, and the frying oil passes through The oil delivery pipe (21) flows into the frying tank (30), and when the surface of the frying oil entering the frying tank (30) reaches a preset height, the second control valve (24) is closed to prevent the oil from passing backwards. The oil feed pipe (21) is returned to the preheating tank (10).

Fourth, the frying step

The frying oil is preheated to fry the foodstuff, and the heater (35) heats the frying tank (30), thereby maintaining the frying oil at an appropriate frying temperature to prevent the frying oil from cooling down. At the same time, the driving device (33) starts to drive the rotation of the drum (32), and the drum (32) and the stirring rod (34) are used to stir the foodstuff, so that the parts of the food material are uniformly heated to enhance frying. Efficiency, at the same time, the pumping unit (40) continuously extracts the air inside the frying tank (30), thereby extracting the water vapor formed by evaporating the moisture content of the food material, and withdrawing the frying tank (30); The food material guided by the stirring rod (34) sliding toward the front end of the drum (32), when falling from the stirring rod (34), guides the food material back to the drum (32) by the guiding surface (322) In the middle section, and according to this, the degree of turnover of the ingredients is increased to improve the frying efficiency.

Five, recycling oil step

After the frying step is completed, the first control valve (23), the third control valve (442) and the sixth control valve (36) are opened, and the fourth control valve (452) and the fifth control valve are closed ( 13), the air pumping unit (41) extracts the air inside the preheating tank (10), and allows outside air to enter the frying tank (30) through the sixth control valve (36), at this time, due to the preheating The tank (10) forms a relatively negative pressure state with respect to the frying tank (30), so that the frying oil is returned to the preheating tank (10) through the oil filter (22), and the oil filter (22) Filter out the residue and debris of the food in the frying oil.

Six, draining steps

The driving device (33) drives the drum (32) to rotate continuously at a higher speed than the frying step, thereby tumbling the food material, using the through hole (324) and the stirring rod (34) penetrated by the drum (32) The perforations (346) are penetrated thereby removing excess frying oil attached to the surface of the foodstuff.

Seven, the discharge step

Closing the first control valve (23), stopping the operation of the air pumping unit (41) and the driving device (33), opening the door leaf (31), and then starting the driving device (33) to rotate the drum (32) Actuating, the food material is taken up by the stirring rod (34), and the food material is slid out of the frying tank along the front end opening of the frying tank (30) along the guide plate (332) to complete the food frying process; The ingredients can be packaged by cooling.

When the frying process is to be carried out again by the present invention, since the frying oil has been recovered to the preheating tank (10), it is not necessary to perform the aforementioned frying oil preheating step, and the foregoing feeding step to the discharging step can be directly performed; Furthermore, when the frying oil is gradually acidified and deteriorated by repeated use, the oil drain valve (25) is opened to release the frying oil.

The frying tank (30) is a horizontally-shaped circular trough body, and the foodstuff is opened and exited from the front end of the frying tank (30), and is further rotated inside the frying tank (30). The drum (32), the food material is subjected to a frying and draining step inside the frying tank (30), and the invention does not need to be used as a conventional frying equipment in combination with the lifting equipment, so that the food can be easily fed into the drum. And the step of discharging, so that the installation location of the vacuum frying device of the present invention is not limited by whether the environment has a lifting device, and the fried food material is directly in the frying tank (30), The drum (32) of the through hole (324) is rotated to perform a draining step, and the surface of the food material sent out to the frying tank (30) is not excessively fried, thereby preventing the oil from dripping in the external environment. Contamination, and the frying oil is directly recovered to the preheating tank (10) by the oil pipeline system (20) for use in subsequent frying processing of the food material, thereby reducing the consumption of the frying oil and improving the utilization rate of the frying oil.

During the frying process, the fine scraps formed by the peeling of the food portion are passed through the oil filter (22) to the preheating tank (10), and the oil filter can be used ( 22) Filtered out, and the operator can timely remove the debris left in the oil filter (22), and when the oil is again transported to the frying tank (30) through the oil pipe (21) for frying processing The fried oil does not contain the waste generated by the previous frying process, thereby avoiding the residue of the fry and causing rapid acidification and deterioration of the frying oil, thereby prolonging the service life of the frying oil.

According to the invention, the drum (32) and each of the stirring rods (34) are configured, and the food material is fully whipped during the frying process, thereby shortening the time required for frying and improving the efficiency of frying processing. And the ingredients are heated evenly, which helps to improve the finished product quality of the frying process. On the other hand, the short frying time can increase the number of times the frying oil is used for frying processing, and also helps to improve the frying oil. The utilization rate, in addition, due to the tumbling action of the drum (32) and the stirring rod (34), the food material does not need to be fully immersed in the frying oil, so that the food material can be fully contacted with the frying oil, and the amount of the frying oil is reduced.

In summary, the invention can fully satisfy the intended purpose and the effect is excellent by the first vacuum frying equipment. Before the application, the same is not the same, and the approximation is known first, and the invention patents are met in accordance with the law. Apply, and pray for an early patent grant as a prayer.

However, the above description is only a preferred embodiment of the present invention, and modifications or alterations made by the skilled person in the spirit of the present invention are intended to be included in the scope of the present invention.

(10). . . Preheating tank

(11). . . Cover

(12). . . Steam room

(122). . . Steam pipe

(124). . . Drain pipe

(13). . . Fifth control valve

(20). . . Oil pipeline system

(twenty one). . . Oil pipeline

(twenty two). . . Oil filter

(222). . . First adapter

(224). . . Second adapter

(twenty three). . . First control valve

(twenty four). . . Second control valve

(25). . . Drain valve

(30). . . Frying tank

(31). . . Door leaf

(32). . . roller

(322). . . Guide surface

(324). . . Through hole

(33). . . Drive unit

(34). . . Stir bar

(342). . . Guides

(344). . . Side fence

(346). . . perforation

(35). . . Heater

(36). . . Sixth control valve

(40). . . Pumping unit

(41). . . Air pumping unit

(412). . . Drive motor

(414). . . Vacuum pump

(42). . . Supervisor

(43). . . Condenser

(432). . . water inlet

(434). . . Outlet

(44). . . First tube

(442). . . Third control valve

(45). . . Second branch

(452). . . Fourth control valve

The first drawing is a front view of a preferred embodiment of the vacuum frying apparatus of the present invention.

The second drawing is a plan view of a preferred embodiment of the vacuum frying apparatus of the present invention.

The third drawing is a front view of the fryer of the preferred embodiment of the vacuum frying apparatus of the present invention in the open state of the slot door.

The fourth drawing is a perspective view of a drum of a preferred embodiment of the vacuum frying apparatus of the present invention.

The fifth figure is a partial view of the third figure viewed from the side of the stir bar.

Figure 6 is a perspective view of a stir bar of a preferred embodiment of the vacuum frying apparatus of the present invention.

The seventh drawing is a flow chart of the food frying processing process performed by the vacuum frying apparatus of the present invention.

(10). . . Preheating tank

(11). . . Cover

(12). . . Steam room

(122). . . Steam pipe

(124). . . Drain pipe

(13). . . Fifth control valve

(20). . . Oil pipeline system

(twenty one). . . Oil pipeline

(twenty two). . . Oil filter

(222). . . First adapter

(224). . . Second adapter

(twenty three). . . First control valve

(twenty four). . . Second control valve

(25). . . Drain valve

(30). . . Frying tank

(31). . . Door leaf

(32). . . roller

(35). . . Heater

(36). . . Sixth control valve

(40). . . Pumping unit

(43). . . Condenser

(432). . . water inlet

(434). . . Outlet

(44). . . First tube

(442). . . Third control valve

(45). . . Second branch

(452). . . Fourth control valve

Claims (10)

A vacuum frying device comprises a preheating tank, a pipeline system, a frying tank and a pumping unit, wherein: a steam chamber is arranged outside the preheating tank to heat the inside of the preheating tank by steam The oil pipeline includes an oil pipeline and an oil filter, wherein the two ends of the oil pipeline are respectively connected with the preheating tank and the frying tank, and the frying oil is transported between the preheating tank and the frying tank. The two ends of the oil filter are respectively connected to the oil pipeline, and the frying oil is returned from the frying tank to the preheating tank through the oil filter, and the dust is filtered to extend the service life of the frying oil; The frying tank is a horizontally-shaped circular trough body, the front end of the frying tank is formed with an opening, and a door fan is disposed in the opening, and the feeding material enters and exits the frying tank, and the oil feeding pipe is connected with the bottom of the frying tank, The frying oil enters the inside of the frying tank, the inside of the frying tank pivots a drum, the drum forms a funnel-shaped annular guiding surface adjacent to the front end, and the front end of the drum forms an opening, so that the foodstuff enters the inside of the drum, The drum wall penetrates a plurality of through holes, and the rear end axis of the drum pivots The frying tank is connected to a driving device for rotating the drum, and the drum is internally provided with a plurality of stirring rods, and each of the stirring rods is respectively connected with the inner wall of the drum, and is used for tumbling the food materials to improve the frying efficiency; The frying tank is provided with a heater on the outer bottom edge for maintaining the temperature of the frying oil; the front end of the stirring rod extends at the front end opening of the drum, and the stirring rod axially forms an inclined shape with the axial direction of the drum, and the crucible is guided. The feeding material is moved to the front end opening of the drum to complete the material discharging; the air discharging unit comprises an air pumping unit and a pipeline system, and the pipeline is connected to the air pumping unit and the preheating tank and the frying tank to borrow The preheating tank and the internal air of the frying tank are separately sucked by the air extracting unit, and the internal pressure of the preheating tank and the frying tank is changed accordingly, and the frying oil is controlled in the preheating tank and the frying tank. Between the flow. The vacuum frying device according to claim 1, wherein the stirring rod has a guide plate and a side baffle, and one side of the guide plate is in contact with the inner wall of the drum, and the side baffle is formed obliquely. On the other side of the guide plate, the guide plate and the side baffle respectively penetrate through a plurality of through holes, and a front end portion of the stirring bar that is in contact with the guiding surface is formed along the guiding surface facing the axis of the roller The shape of the bend is such that the stir bar is actuated by the rotation of the drum, and the foodstuff in the drum is agitated to improve the frying efficiency. The vacuum frying apparatus according to claim 1, wherein the pipeline comprises a main pipe, a first branch pipe and a second branch pipe, wherein one end of the main pipe is connected to the air pumping unit, and the other end is connected Communicating with each of the branch pipes, the first branch pipe is connected to the preheating tank, and the second branch pipe is connected to the frying tank, and the air pumping unit separately sucks the preheating tank and the air inside the frying tank By. The vacuum frying apparatus according to claim 3, wherein the pipeline further comprises a condenser, wherein the condenser is adjacent to the top end, and a water outlet is laterally provided, the condenser being adjacent to the bottom. At the end, a water inlet is provided laterally, and the main pipe is connected to the bottom end of the condenser, and one end of each of the branch pipes is respectively connected with the top end of the condenser, and the main pipe is connected to each of the branch pipes through the condenser, and the condensation is performed by the condenser The device is condensed to remove the moisture contained in the extracted air, and is used to extend the service life of the pumping unit. The vacuum frying device according to claim 3, wherein the first branch pipe is provided with a third control valve, the second branch pipe is provided with a fourth control valve, and the preheating tank is provided with a fifth control valve. The frying tank is provided with a sixth control valve for controlling the change of the pressure state inside the preheating tank and the frying tank by opening and closing of the control valves. The vacuum frying device of claim 1, wherein the oil pipeline system further comprises a first control valve and a second control valve, wherein the oil filter is provided with a first connecting pipe at one end and the other end a first connecting pipe is disposed adjacent to the preheating tank, the second connecting pipe is connected to the oil feeding pipe adjacent to the frying tank, and the first control valve is disposed at the first connecting pipe The second control valve is disposed between the connecting pipe and the oil pipe, and controls the frying oil in the preheating tank and the frying tank by opening and closing each of the control valves The flow path between. The vacuum frying device according to claim 6, wherein the oil pipeline further comprises a drain valve, wherein the drain valve is disposed on the oil pipeline for discharging the oil to the outside. The vacuum frying device according to claim 1, wherein the steam chamber is provided with a steam pipe, and the steam pipe is connected to a steam source, and the steam is introduced into the steam chamber; the bottom of the steam chamber is connected A drain pipe that is used to condense water from the discharge steam. A food frying processing process executed by using the vacuum frying device described in claim 1 of the patent application, the process comprising the steps of: feeding step: placing the food to be processed into the frying tank; and feeding the oil step: opening the The communication between the preheating tank and the frying tank starts the pumping unit to form a negative pressure state of the frying tank relative to the preheating tank, thereby attracting the heated frying oil in the preheating tank Flowing toward the frying tank, when the frying oil level of the frying tank reaches a preset height, closing the communication of the oil pipeline; frying step: frying the food material by preheating the frying oil, and the heating The fryer is heated to maintain the temperature of the frying oil, and at the same time, the drum rotates, and the foodstuff is stirred by the drum and the stirring rod to uniformly heat the parts of the foodstuff to improve frying efficiency, and at the same time, The pumping unit continuously extracts the air inside the frying tank, thereby extracting the water vapor formed by evaporating the moisture content of the food material, and withdrawing the frying tank; and recovering the frying oil step: stopping the extraction of the air inside the frying tank, and starting to extract the air Preheat the air inside the tank, so that The preheating tank forms a relatively negative pressure state with respect to the frying tank, and forms a communication between the preheating tank and the frying tank through the oil filter, thereby sucking the frying oil through the oil filter to return to the preheating a hot chute, and filtering the froth in the frying oil according to the oil filter; draining step: the drum is continuously rotated, thereby tumbling the foodstuff, and thereby removing excess frying oil attached to the surface of the foodstuff; : stopping the operation of the air pumping unit and the drum, opening the door leaf, and then starting the drum rotation, taking the foodstuff by the stirring rod, and sliding the food material out of the frying tank toward the front end opening of the frying tank to complete the food oil Explosion process. According to the food frying processing process of claim 9, further comprising a frying oil preheating step, wherein the frying oil preheating step is to block the preheating tank before the feeding step is performed The frying tank is connected to the frying tank, and then the frying oil used in the frying process is injected into the preheating tank, and the preheating tank is closed, and the air extracting unit is started to extract the air inside the preheating tank, and the steam is introduced. The steam chamber raises the frying oil in the preheating tank to the temperature required for frying the food.