CN106731178B

CN106731178B - High-efficiency two-stage vacuum oil filtering system

Info

Publication number: CN106731178B
Application number: CN201611213559.8A
Authority: CN
Inventors: 赵奇
Original assignee: Chongqing Haiguo Technology Co ltd
Current assignee: Yantai Qisheng Petrochemical Co ltd
Priority date: 2016-12-25
Filing date: 2016-12-25
Publication date: 2022-07-26
Anticipated expiration: 2036-12-25
Also published as: CN106731178A

Abstract

The invention provides a high-efficiency two-stage vacuum oil filtering system which comprises a vacuum separation device, wherein the vacuum separation device comprises a vacuum tank and an atomizer arranged in the vacuum tank, the atomizer comprises an upper pressing block, a lower pressing block body and an oil conveying pipe, the lower body is provided with an oil passage, the top surface of the lower body is provided with a lower oil spraying groove, and the lower body is provided with two through holes longitudinally penetrating through the lower body; the upper pressing block comprises an upper body, and an upper oil spraying groove is formed in the bottom surface of the upper body; two convex strips matched with the lower body through hole are arranged at the bottom of the upper body. The invention has the beneficial effects that: when oil from spout oil groove, the oil spout groove under the second leaves body down, go up the body, oil receives the influence of centrifugal force and impact force, in addition itself gets into the decompression effect in big space from the little space, can separate for innumerable atomizing oil particle, and half atomizing effect is better, and vapor and atomizing oil particle are better to be separated.

Description

High-efficiency two-stage vacuum oil filtering system

Technical Field

The invention relates to the field of lubricating oil production and processing, in particular to a high-efficiency two-stage vacuum oil filtering system.

Background

The vacuum oil filter is designed according to the principle that the boiling points of water and oil are different, and comprises a prefilter 4, a vacuum heating tank, an oil pump 18, a filtering device, a condenser (namely a condenser), a vacuum pump 17 and the like. The vacuum pump 17 pumps the air in the vacuum heating tank out from the gas phase outlet of the vacuum heating tank to form vacuum, and the external oil passes through the prefilter 4 under the action of atmospheric pressure to remove larger particles and then enters the heating zone in the vacuum heating tank. The heated oil is separated into semi-fog by the flying rotation of the spray wings, the water in the oil is rapidly evaporated into steam, the mixed air is continuously sucked into the condenser by the vacuum pump 17, the steam entering the condenser is cooled and then returns to water to be discharged, the oil in the vacuum heating tank is discharged into the fine filter 19 by the oil discharge pump 18, and the fine particle impurities are filtered out by the oil filter paper or the filter element, thereby completing the whole process of rapidly removing the impurities, water and gas in the oil by the vacuum oil filter, and discharging clean oil out of the machine from the oil outlet. The double-stage vacuum firstly aims at realizing 'large pumping speed', namely efficiency, and rapidly increasing the vacuum degree; and secondly, the area of vacuum flash evaporation is increased, so that the emulsion is effectively and rapidly broken, and the moisture is removed. In the existing double-stage vacuum oil filtering system in the market at present, oil is separated into semi-fog by adopting spray wings or a spray head, so that water is vaporized into steam. However, the medium is dirty oil, so the spray wings or the spray heads are easily blocked by dirt, the filtering effect is influenced, and the spray wings or the spray heads are not easy to clean after being blocked; the oil spraying direction of the spray head is fixed, the spraying channels of the spraying wings are fewer, and the spray head and the spraying wings cannot well separate oil into mist-shaped oil and water so as to realize oil-water separation; the spray wing or the spray head is composed of a plurality of additional parts, including bolts and nuts, and the parts are easy to fall off when rotating at high speed, thereby causing secondary pollution to oil bodies; in the condensation process, generally adopt the two-stage water-cooling, the condenser adopts simple structure's shell and tube heat exchanger, for making the air current obtain great cold volume, the shell is walked to the design gaseous phase, and the cooling water walks the tube side, nevertheless so sets up, and the air current has accumulative impact to the heat exchange tube of tube side, uses for a long time, and the heat exchange tube is fragile, influences the heat transfer effect.

Disclosure of Invention

Therefore, the invention provides a high-efficiency two-stage vacuum oil filtering system, which solves the problems that the spraying wings or spray heads of the conventional two-stage vacuum oil filtering system are easy to block and not easy to clean, the oil-water separation effect is poor, parts in the operation process cause secondary pollution to oil bodies, and airflow in the condensation process impacts heat exchange tubes to break and damage the heat exchange tubes, so that the heat exchange effect is influenced.

The technical scheme of the invention is realized as follows: a high-efficiency two-stage vacuum oil filtering system comprises an oil inlet, a pipeline turbulent flow heater, a constant temperature controller, a prefilter, an oil supply solenoid valve, an oil inlet valve, a vacuum separation device, a vacuum meter, a first tubular heat exchanger, a second tubular heat exchanger, a three-stage roots pump, a two-stage roots pump, a gas-liquid separation tank, a water receiver, a vacuum one-way valve, a ripple compensator, a vacuum pump, an oil pump, a fine filter and an oil outlet.

Vacuum separator includes vacuum tank, locates the atomizer in the vacuum tank, locates foam sensor, the gas permeation pipe on the vacuum tank inner wall of atomizer below, gas permeation pipe one end is located in the vacuum tank, and the vacuum tank is worn out to the other end, establishes the gas valve that oozes on the gas permeation pipe outside the vacuum tank, establishes the gas permeation hole on the gas permeation pipe in the vacuum tank. A foam sensor is arranged in the vacuum tank, so that the foam in the vacuum tank can be detected and accurately controlled.

The atomizer comprises an upper pressing block and a lower pressing block, wherein the lower pressing block comprises a lower cylindrical body and an oil delivery pipe arranged at the bottom of the lower body, an oil passage longitudinally penetrating through the lower body is formed in the center of the lower body, the cross section of the oil passage is circular, a plurality of lower oil spraying grooves are formed in the top surface of the lower body, each lower oil spraying groove comprises a first lower oil spraying groove and a second lower oil spraying groove, the first lower oil spraying groove is arranged along the tangential direction of the oil passage, one end of the first lower oil spraying groove is communicated with the oil passage, the other end of the first lower oil spraying groove is communicated with the second lower oil spraying groove, the second lower oil spraying groove extends to the outer wall of the lower body, the included angle alpha between the first lower oil spraying groove and the second lower oil spraying groove is 145 degrees, two through holes longitudinally penetrating through the lower body are formed in the lower body, the oil delivery pipe is communicated with the oil passage, and the central shaft of the oil delivery pipe is coaxial with the central shaft of the oil passage, the two through holes are symmetrical about the central axis of the oil passage; go up the briquetting including being the last body of cylinder form that is used for body under the cooperation, the top of going up the body is established and is driven the body and follow last body center pin pivoted motor, the bottom surface of going up the body is equipped with the last oil spout groove of spouting oil groove under a plurality of cooperations, wherein, every is gone up the oil spout groove and is included the first oil spout groove of spouting that corresponds with first oil spout groove, spout the oil spout groove on the second that corresponds with oil spout groove under the second, go up the oil spout groove, spout oil spout groove cooperation down and form the nozzle opening of oil from defeated oil pipe delivery atomizer.

The bottom of the upper body is provided with two convex strips matched with the through hole of the lower body, the length of each convex strip is larger than that of the through hole, the bottom of each convex strip is provided with a hole transversely penetrating through the convex strip, when the convex strip is inserted into the through hole, a strip-shaped fixing piece is arranged in the hole in a pluggable manner, the fixing piece comprises a first fixing piece and a second fixing piece, two ends of the first fixing piece and two ends of the second fixing piece are respectively provided with an upward-inclined structure, the outer wall of the oil delivery pipe below the first fixing piece is respectively provided with a first branch piece and a second branch piece, the outer wall of the oil delivery pipe below the second fixing piece is respectively provided with a third branch piece and a fourth branch piece, the distance from the first branch piece to the bottom of the oil delivery pipe is larger than that from the second branch piece to the bottom of the oil delivery pipe, the distance from the third branch piece to the bottom of the oil delivery pipe is larger than that from the fourth branch piece to the bottom of the oil delivery pipe, the first branch piece, the second branch piece and the first fixing piece are coplanar, the third branch piece, the fourth branch piece and the second fixing piece are coplanar, and the first branch piece, the second branch piece, the third branch piece and the fourth branch piece are symmetrical about the central axis of the oil conveying pipe.

The ends of the first and second branch pieces departing from the oil pipeline are both provided with clamping ends downwards and vertically, a first spring is detachably arranged between the first support part and one end of the first fixing part, the top and the bottom of the first spring are both provided with circular rings, the circular ring at the top of the first spring is sleeved at one end of the first fixing piece and limited by the upward-inclining structure at one end of the first fixing piece, the circular ring at the bottom of the first spring is sleeved on the first support member and is limited by the clamping end of the first support member, a second spring is detachably arranged between the second supporting piece and the other end of the first fixing piece, the top and the bottom of the second spring are both provided with circular rings, the circular ring at the top of the second spring is sleeved at the other end of the first fixing piece and limited by the upward-inclining structure at the other end of the first fixing piece, the circular ring at the bottom of the second spring is sleeved on the second supporting piece and limited by the clamping end of the supporting piece; the ends of the third branch piece and the fourth branch piece, which are far away from the oil pipeline, are respectively provided with a clamping end downwards and vertically, a third spring is detachably arranged between the third supporting piece and one end of the second fixing piece, the top and the bottom of the third spring are both provided with circular rings, the circular ring at the top of the third spring is sleeved at one end of the second fixing piece and limited by the upward-inclining structure at one end of the second fixing piece, the circular ring at the bottom of the third spring is sleeved on the third supporting piece and limited by the clamping end of the third supporting piece, a fourth spring is detachably arranged between the fourth supporting piece and the other end of the second fixing piece, the top and the bottom of the fourth spring are both provided with circular rings, the circular ring at the top of the fourth spring is sleeved at the other end of the second fixing piece and limited by the upward-inclining structure at the other end of the second fixing piece, the ring at the bottom of the fourth spring is sleeved on the fourth supporting piece and is limited by the clamping end of the fourth supporting piece.

The shell side of the first tubular heat exchanger and the shell side of the second tubular heat exchanger are gas phase channels, the tube sides of the first tubular heat exchanger and the second tubular heat exchanger are liquid phase channels, the gas phase inlet pipe of the first tubular heat exchanger and the gas phase inlet pipe of the second tubular heat exchanger are internally provided with the flow dividing device, the flow dividing device comprises a cylindrical body, six flow dividing sheets which are in a right trapezoid shape are uniformly distributed on the outer wall of the body, and the body is connected into the gas phase inlet pipe of the first tubular heat exchanger and the gas phase inlet pipe of the second tubular heat exchanger through connecting pieces. Because the shell side of first shell and tube heat exchanger, the second shell and tube heat exchanger is the gaseous phase passageway, gaseous entering from the gaseous phase import will produce the impact to the shell and tube of shell and tube side, do not receive the impact that comes from gaseous phase import in order to protect the shell and tube, so the diverging device has been set up, a plurality of six splitter plates that are right angle trapezoidal form that the cylindric body cooperation body outer wall equipartition of diverging device, neither to the gaseous import pipe of first shell and tube heat exchanger, the gaseous production great resistance of second shell and tube heat exchanger gaseous import pipe, the hypotenuse of right angle trapezoidal and the passageway between every two adjacent splitter plates can play the effect of equalling divide the air current, divide into six with originally for the air current of one strand, disperse the impact force, make gaseous no longer produce the impact to the shell and tube, the heat transfer effect has been guaranteed, the life of first shell and tube heat exchanger, second shell and tube heat exchanger has been prolonged.

The oil inlet, the pipeline turbulent heater, the constant temperature controller, the primary filter, the oil supply electromagnetic valve and the oil inlet valve are sequentially communicated through pipelines, the oil inlet valve is communicated with an oil conveying pipe through the oil inlet pipe, the oil conveying pipe is rotatably and vertically arranged on the oil inlet pipe, an air outlet is formed in the top of the vacuum tank, the air outlet, the vacuum meter, a gas phase channel of the first row pipe heat exchanger, a gas phase channel of the second row pipe heat exchanger, a three-stage roots pump, a two-stage roots pump and a gas-liquid separation tank are sequentially communicated through pipelines, a gas phase outlet of the gas-liquid separation tank, the vacuum one-way valve, the corrugated compensator and the vacuum pump are sequentially communicated through pipelines, a liquid phase outlet of the gas-liquid separation tank is communicated with a water storage device through a pipeline, an oil conveying port is formed in the bottom of the vacuum tank, and the oil conveying port, the oil pump, the fine filter and the oil outlet are sequentially communicated through pipelines. The vacuum unit consisting of two roots pumps with large pumping speed and a vacuum pump is adopted to vacuumize a system, so that water vapor and other gases evaporated from oil can be rapidly discharged; high-temperature high-heat vapor and other gases evaporated in the vacuum tank are subjected to condensation water removal and gas-liquid separation treatment, the effective output power of the system is enhanced, the service life of the vacuum pump is greatly prolonged, a vacuum check valve and a corrugated compensator are arranged in front of the vacuum pump, the vacuum check valve prevents gas from flowing backwards under abnormal conditions, the preorder equipment is protected, and the corrugated compensator plays the roles of reducing the deformation stress of the pipeline and prolonging the service life of the pipeline.

The lower oil spout is communicated with the space in the oil passage channel and the vacuum tank, namely the oil spout hole formed by the matching of the upper oil spout and the lower oil spout is also communicated with the space in the vacuum tank, the oil is sent out of the atomizer, the upper body and the lower body are combined into the complete atomizer by passing through the through hole through the convex strip, the motor drives the upper body to rotate along the central axis of the upper body, namely the lower body is driven to rotate together, and further the atomizer rotates on the oil inlet pipe, the oil enters the oil spout hole from the oil pipeline, because the first lower oil spout groove forming the oil spout hole is arranged along the tangential direction of the oil spout groove, the first upper oil spout groove is also arranged along the tangential direction of the oil spout groove, one end of the first lower oil spout groove is communicated with the oil spout groove, the other end of the first lower oil spout groove is communicated with the second lower oil spout groove, the second lower oil spout groove extends to the outer wall of the lower body, one end of the first upper oil spout groove is arranged on the bottom surface of the upper body, the other end of the first upper oil spout groove is communicated with the second upper oil spout groove, the oil spout groove extends to the outer wall of last body on the second, and the nozzle opening communicates oilway passageway and atomizer outer wall promptly, and the motion trail of oil (between oilway passageway and the vacuum tank) is then in the oil spout: because the lower body rotates and is influenced by centrifugal force, the oil is thrown out from the tangential direction of the circular oil path channel, directly enters a first lower oil spraying groove and a first upper oil spraying groove which are arranged along the tangential direction of the oil path channel, then enters a second lower oil spraying groove which is connected with the first lower oil spraying groove and a second upper oil spraying groove which is communicated with the first upper oil spraying groove, because the included angle alpha between the first lower oil spraying groove and the second lower oil spraying groove is 145 degrees and the included angle between the first upper oil spraying groove and the second upper oil spraying groove is also 145 degrees, the oil is influenced by the centrifugal force and the impact force when leaving the first lower oil spraying groove, the first upper oil spraying groove and entering the second lower oil spraying groove and the second upper oil spraying groove and then enters the lower body and the upper body from the second lower oil spraying groove and the second upper oil spraying groove and then enters a large space from a small space through the decompression function of the oil, can separate into innumerable atomizing oil granule, half atomizing effect is better, and vapor and atomizing oil granule better separation, the contained angle alpha between oil spout groove under first oil spout groove and the second is 145, and the contained angle between oil spout groove is 145 on first oil spout groove and the second, is an obtuse angle design, is difficult to be blockked up by the filth. And the design of adopting to decompose the nozzle opening into spout under spout and spout, combines fixed body, lower body with sand grip cooperation through-hole, easy split, easy washing, and reduced additional parts such as bolt nut, reduced the risk that the oil body is by secondary pollution. First spout oil groove, first last oil spout groove along the setting of oil road passageway tangential direction, oil directly gets into first spout oil groove, first last oil spout inslot when being thrown away by the rotation, and the initial velocity does not reduce, has guaranteed that great initial velocity striking second spouts oil groove, second on spout oil groove, the striking dynamics is bigger, and atomization effect is better.

In order to ensure that the upper body and the lower body cannot be separated during rotation, the length of the raised line is designed to be larger than that of the through hole, a hole transversely penetrating through the raised line is formed in the bottom of each raised line, when the raised line is inserted into the through hole, the hole is exposed outside along with the part of the raised line penetrating out of the lower body, at the moment, the first fixing piece and the first supporting piece are tensioned through the first spring, the first fixing piece and the second supporting piece are tensioned through the second spring, the second fixing piece and the third supporting piece are tensioned through the third spring, the second fixing piece and the fourth supporting piece are tensioned through the fourth spring, namely, the first spring and the second spring are matched to tension the first fixing piece and the oil delivery pipe, the third spring and the fourth spring are matched to tension the second fixing piece and the oil delivery pipe, the upper body and the lower body are not separated during rotation, and only the spring needs to be removed when the upper body and the lower body need to be separated because of the elasticity of the spring, the first fixing piece and the second fixing piece are taken out to be separated, the structure is simple, the operation is simple and convenient, and the oil atomization effect is guaranteed as the upper body and the lower body are not separated under the working state.

A first circulating section is arranged between an outlet of the oil pump and the oil inlet pipe, and a first circulating valve is arranged on the first circulating section, so that water and oil can be repeatedly separated from the separated oil body, and the separation effect is enhanced; a second circulation section is arranged between the outlet of the oil pump and the inlet of the pipeline turbulent heater, a second circulation valve is arranged on the second circulation section, and the separated oil body is subjected to repeated heating, primary filtering and oil-water separation and is subjected to repeated circulation, so that the heating oil filtering effect is better; and a third circulation section is arranged between the outlet of the fine filter and the inlet of the pipeline turbulent flow heater, a third circulation valve is arranged on the third circulation section, and the separated oil body is repeatedly heated, filtered and subjected to oil-water separation until the oil body reaching the standard is obtained.

A first secondary line is arranged between the oil supply electromagnetic valve and the oil inlet pipe, a first oil inlet valve is arranged on the first secondary line, a first secondary circulation section bypassing the first circulation valve is arranged between the inlet and the outlet of the first circulation valve, and the first secondary circulation valve is arranged on the first secondary circulation section. And bypasses are respectively arranged on the oil inlet pipe and the first circulation section, and control and adjustment means are added.

Furthermore, a first vacuum pressure controller and a second vacuum pressure controller are sequentially arranged on a pipeline between a gas phase outlet of the second tubular heat exchanger and the three-stage roots pump, and a check valve, a pressure controller and a pressure gauge are sequentially arranged on a pipeline behind an outlet of the oil pump. Convenient operation, protection equipment.

Furthermore, all establish the blow off pipe on prefilter, secondary filter, the water receiver, all establish the blowoff valve on every blow off pipe, the oil drain valve of intercommunication vacuum tank is established to vacuum tank bottom, establish the sample valve of intercommunication pipeline on the outlet pipeline of secondary filter. The blow off pipe, the blowoff valve, the oil drain valve make things convenient for the blowdown to overhaul, and the sample valve makes things convenient for the sample analysis oil sample whether qualified up to standard.

Furthermore, a controller is arranged outside the vacuum tank and used for automatically controlling the starting of the oil pump so as to control the oil level in the vacuum tank. The controller controls the self-starting of the oil pump, protects the oil from overflowing and being not full of liquid, protects equipment, simplifies operation and saves human resources.

Through the above disclosure, the beneficial effects of the invention are as follows:

firstly, a foam sensor is arranged in the vacuum tank, and can detect and accurately control the foam in the vacuum tank;

the cylindrical body of the flow dividing device is matched with a plurality of six flow dividing plates which are uniformly distributed on the outer wall of the body and are in a right-angle trapezoid shape, so that great resistance is not generated on gas passing through a gas phase inlet pipe of a first tubular heat exchanger and a gas phase inlet pipe of a second tubular heat exchanger, the inclined edge of the right-angle trapezoid and a channel between every two adjacent flow dividing plates can play a role in dividing gas flow evenly, the gas flow which is one flow is divided into six strands, impact force is dispersed, the gas does not impact the tubular heat exchanger, the heat exchange effect is ensured, and the service lives of the first tubular heat exchanger and the second tubular heat exchanger are prolonged;

vacuumizing a system by using a vacuum unit consisting of two roots pumps with high pumping speed and a vacuum pump, so that water vapor and other gases evaporated from oil can be quickly discharged; the vacuum pump is provided with a vacuum one-way valve and a corrugated compensator in front of the vacuum pump, the vacuum one-way valve prevents gas from flowing backwards under abnormal conditions, the preorder equipment is protected, and the corrugated compensator plays the roles of reducing the deformation stress of the pipeline and prolonging the service life of the pipeline;

the oil leaves the first lower oil spraying groove and the first upper oil spraying groove, is subjected to buffer resistance and collision in the process of entering the second lower oil spraying groove and the second upper oil spraying groove, and then is separated into countless atomized oil particles under the influence of centrifugal force and impact force when leaving the lower body and the upper body from the second lower oil spraying groove and the second upper oil spraying groove, and is separated into countless atomized oil particles under the pressure reduction effect of entering a large space from a small space, so that the semi-atomization effect is better, and water vapor is better separated from the atomized oil particles;

the included angle alpha between the first lower oil spraying groove and the second lower oil spraying groove is 145 degrees, the included angle between the first upper oil spraying groove and the second upper oil spraying groove is 145 degrees, and the oil spraying device is designed to be an obtuse angle and is not easy to be blocked by dirt;

the oil spray hole is divided into an upper oil spray groove and a lower oil spray groove, the upper body and the lower body are fixedly combined by the raised line and the through hole, the oil spray hole is easy to disassemble and clean, additional parts such as bolts, nuts and the like are reduced, and the risk of secondary pollution of oil bodies is reduced;

the first spring and the second spring are matched to tension the first fixing piece and the oil conveying pipe, the third spring and the fourth spring are matched to tension the second fixing piece and the oil conveying pipe, the upper body and the lower body are tensioned to be prevented from being separated in the rotating process, and due to the elasticity of the springs, when the upper body and the lower body need to be separated, the first fixing piece and the second fixing piece can be separated only by taking down the springs, so that the structure is simple, the operation is simple and convenient, and the oil atomization effect can be ensured by ensuring that the upper body and the lower body cannot be separated in a working state;

and the first lower oil spraying groove and the first upper oil spraying groove are arranged along the tangential direction of an oil path channel, oil directly enters the first lower oil spraying groove and the first upper oil spraying groove when being thrown out in a rotating mode, the initial speed is not reduced, the fact that the larger initial speed impacts the second lower oil spraying groove and the second upper oil spraying groove is ensured, the impact force is larger, and the atomization effect is better.

Drawings

Fig. 1 is a schematic structural diagram of a high-efficiency two-stage vacuum oil filtering system.

Fig. 2 is a schematic structural diagram of the vacuum separation device.

Fig. 3 is a schematic structural view of the atomizer.

FIG. 4 is a schematic structural view of the upper pressing block.

FIG. 5 is a cross-sectional view of the lower compact.

Fig. 6 is a top view of the lower body.

Fig. 7 is a bottom view of the upper body.

Fig. 8 is a schematic structural diagram of the first tubular heat exchanger.

Fig. 9 is a cross-sectional view of the flow divider in the gas phase inlet tube of the first shell and tube heat exchanger.

Fig. 10 is a bottom view of the flow divider in the gas phase inlet tube of the first shell and tube heat exchanger.

The reference numbers are as follows:

1. an oil inlet; 2. a pipeline turbulence heater; 3. a thermostatic controller; 4. primary filtering; 5. an oil supply solenoid valve; 6. an oil inlet valve; 7. a vacuum separation device; 8. a vacuum gauge; 9. a first shell and tube heat exchanger; 10. a second shell and tube heat exchanger; 11. a three-stage roots pump; 12. a second-stage roots pump; 13. a gas-liquid separation tank; 14. a water reservoir; 15. a vacuum check valve; 16. a ripple compensator; 17. a vacuum pump; 18. an oil pump; 19. a fine filter; 20. a first circulation valve; 21. a second circulation valve; 22. a third circulation valve; 23. an oil outlet; 24. a vacuum tank; 24a, an air outlet; 24b, an oil delivery port; 24c, a fuel drain valve; 24d, a control instrument; 25. a gas phase inlet pipe of the first shell and tube heat exchanger; 26. an atomizer; 27. a foam sensor; 28. air infiltration pipe; 28a, an air leakage valve; 28b, air seepage holes; 29. pressing the block; 29a, an upper body; 29b, a motor; 29c, convex strips; 29d, a hole; 29e, a first fixing piece; 29f, a second fixing piece; 30. pressing a block; 30a, a lower body; 30b, an oil delivery pipe; 30c, an oil path channel; 30d, through holes; 30e, a first ejection member; 30f, a second branch-off member; 30g, a third supporting member; 30h, a fourth supporting part; 31. a lower oil spray groove; 31a, a first lower oil spout groove; 31b, a second lower oil spout groove; 32. an upper oil spraying groove; 32a, a first upper oil spraying groove; 32b, a second upper oil spraying groove; 33. an oil jet hole; 34. a clamping end; 35. a first spring; 36. a circular ring; 37. a second spring; 38. a third spring; 39. a fourth spring; 40. a connecting member; 41. a first circulation section; 42. an oil inlet pipe; 43. a second circulation zone; 44. a third circulation section; 45. a first sub-line; 45a, a first oil inlet valve; 46. a first subcirculation section; 46a, a first secondary circulation valve; 47. a first vacuum pressure controller; 48. a second vacuum pressure controller; 49. a check valve; 50. a pressure controller; 51. a pressure gauge; 52. a blowdown valve; 53. a sampling valve; 54. a body; 54a and a splitter plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 10, the high-efficiency two-stage vacuum oil filtering system comprises an oil inlet 1, a pipeline turbulent heater 2, a thermostatic controller 3, a prefilter 4, an oil supply solenoid valve 5, an oil inlet valve 6, a vacuum separation device 7, a vacuum meter 8, a first tube heat exchanger 9, a second tube heat exchanger 10, a three-stage roots pump 11, a two-stage roots pump 12, a gas-liquid separation tank 13, a water receiver 14, a vacuum one-way valve 15, a ripple compensator 16, a vacuum pump 17, an oil pump 18, a fine filter 19 and an oil outlet 23.

Referring to fig. 2, the vacuum separation apparatus 7 includes a vacuum tank 24, an atomizer 26 disposed in an upper space of the vacuum tank 24, a foam sensor 27 disposed on an inner wall of the vacuum tank 24 below the atomizer 26, and an air-permeable pipe 28, wherein one end of the air-permeable pipe 28 is disposed in the vacuum tank 24, and the other end of the air-permeable pipe passes through the vacuum tank 24, an air-permeable valve 28a is disposed on the air-permeable pipe 28 outside the vacuum tank 24, an air-permeable hole 28b is disposed on the air-permeable pipe 28 in the vacuum tank 24, and air below the vacuum tank enters the air-permeable pipe 28 through the air-permeable hole 28b and is discharged through the air-permeable valve 28 a.

Referring to fig. 3, the atomizer 26 includes an upper pressing block 29 and a lower pressing block 30, the lower pressing block 30 includes a lower body 30a in a cylindrical shape, and an oil pipeline 30b disposed at the bottom of the lower body 30a, and referring to fig. 6, an oil passage 30c longitudinally penetrating the lower body 30a is disposed at the center of the lower body 30a, the cross section of the oil passage 30c is circular, a plurality of lower oil injection grooves 31 are disposed on the top surface of the lower body 30a, referring to fig. 6, 10 lower oil injection grooves 31 are disposed, and of course, more lower oil injection grooves may be disposed, and the greater the number of lower oil injection grooves, the stronger the oil atomizing capability is; each lower oil injection groove 31 comprises a first lower oil injection groove 31a and a second lower oil injection groove 31b, the first lower oil injection groove 31a is arranged along the tangential direction of an oil passage channel 30c, one end of the first lower oil injection groove 31a is communicated with the oil passage channel 30c, the other end of the first lower oil injection groove 31a is communicated with the second lower oil injection groove 31b, the second lower oil injection groove 31b extends to the outer wall of the lower body 30a, the included angle alpha between the first lower oil injection groove 31a and the second lower oil injection groove 31b is 145 degrees, two through holes 30d longitudinally penetrating through the lower body 30a are arranged on the lower body 30a, the oil delivery pipe 30b is communicated with the oil passage channel 30c, the central axis of the oil delivery pipe 30b is coaxial with the central axis of the oil passage channel 30c, and the two through holes 30d are symmetrical about the central axis of the oil passage channel 30 c.

Referring to fig. 4 and 7, the upper pressing block 29 includes an upper body 29a having a cylindrical shape for engaging with the lower body 30a, that is, the upper body 29a and the lower body 30a are coaxially disposed, the top of the upper body 29a is provided with a motor 29b which drives the upper body 29a to rotate along the central axis of the upper body 29a, the bottom surface of the upper body 29a is provided with a plurality of upper oil injection grooves 32 matching with the lower oil injection grooves 31, see fig. 7, and also, the present embodiment is provided with 10 upper oil injection grooves 32, wherein each of the upper oil spout grooves 32 includes a first upper oil spout groove 32a corresponding to the first lower oil spout groove 31a, a second upper oil spout groove 32b corresponding to the second lower oil spout groove 31b, one end of the first upper oil spout 32a is connected to the bottom surface of the upper body 29a, and the other end is communicated with the second upper oil spout 32b, see fig. 3, the upper and lower

oil injection grooves

32, 31 cooperate to form an oil injection hole 33 for delivering oil from the oil delivery pipe 30b to the atomizer 26.

Referring to fig. 3-7, the bottom of the upper body 29a is provided with two protruding strips 29c matching with the through hole 30d of the lower body 30a, the length of the protruding strip 29c is greater than that of the through hole 30d, the bottom of each protruding strip 29c is provided with a hole 29d transversely penetrating through the protruding strip 29c, when the protruding strip 29c is inserted into the through hole 30d, a strip-shaped fixing member is arranged in the hole 29d in a retractable manner, the fixing member comprises a first fixing member 29e and a second fixing member 29f, both ends of the first fixing member 29e and the second fixing member 29f are respectively provided with an upward-inclined structure, the outer wall of the oil pipeline 30b below the first fixing member 29e is respectively provided with a first branch member 30e and a second branch member 30f, the outer wall of the oil pipeline 30b below the second fixing member 29f is respectively provided with a third branch member 30g and a fourth branch member 30h, wherein the distance from the first branch member 30e to the bottom of the oil pipeline 30b is greater than the distance from the second branch member 30f to the bottom of the oil pipeline 30b, the distance from the third branch piece 30g to the bottom of the oil delivery pipe 30b is greater than the distance from the fourth branch piece 30h to the bottom of the oil delivery pipe 30b, the first branch piece 30e, the second branch piece 30f and the first fixing piece 29e are coplanar, the third branch piece 30g, the fourth branch piece 30h and the second fixing piece 29f are coplanar, and the first branch piece 30e and the second branch piece 30f are symmetrical to the third branch piece 30g and the fourth branch piece 30h about the central axis of the oil delivery pipe 30 b. Referring to fig. 1, oil inlet pipe 42 has a vertical end, atomizer 26 is vertically arranged on the vertical end and does the circumference operation around the axis of vertical end, during the use, motor 29b drives atomizer 26 rotatory, oil gets into defeated oil pipe 30b from oil inlet pipe 42, and spout to vacuum tank 24 in by nozzle opening 33, atomizer 26 is rotatory, nozzle opening 33 is also rotatory oil discharging promptly, in addition second oil spout groove 31b down, the collision that nozzle opening 32b brought on the second, make the filth in the oil, dregs scatter and spout from nozzle opening 33, not only be difficult for blockking up nozzle opening 33, and promoted the atomizing effect of oil.

Referring to fig. 3, the ends of the first branch-out member 30e and the second branch-out member 30f, which are away from the oil pipeline 30b, are both provided with a downward vertical clamping end 34, a first spring 35 is detachably disposed between the first branch-out member 30e and one end of the first fixing member 29e, the top and the bottom of the first spring 35 are both provided with a circular ring 36, the circular ring 36 at the top of the first spring 35 is sleeved on one end of the first fixing member 29e and is limited by the upward-inclining structure at one end of the first fixing member 29e, the circular ring 36 at the bottom of the first spring 35 is sleeved on the first branch-out member 30e and is limited by the clamping end 34 of the first branch-out member 30e, a second spring 37 is detachably disposed between the second branch-out member 30f and the other end of the first fixing member 29e, the top and the bottom of the second spring 37 are both provided with a circular ring 36, the circular ring 36 at the top of the second spring 37 is sleeved on the other end of the first fixing member 29e and is limited by the upward-inclining structure at the other end of the first fixing member 29e, the ring 36 at the bottom of the second spring 37 is sleeved on the second supporting member 30f and is limited by the clamping end 34 of the supporting member 30 f.

Referring to fig. 3, the ends of the third branch piece 30g and the fourth branch piece 30h, which are away from the oil pipeline 30b, are both provided with a clamping end 34 downward and vertically, a third spring 38 is detachably arranged between the third branch piece 30g and one end of the second fixing piece 29f, the top and the bottom of the third spring 38 are both provided with a ring 36, the ring 36 at the top of the third spring 38 is sleeved on one end of the second fixing piece 29f and is limited by an upward-inclining structure at one end of the second fixing piece 29f, the ring 36 at the bottom of the third spring 38 is sleeved on the third branch piece 30g and is limited by the clamping end 34 of the third branch piece 30g, a fourth spring 39 is detachably arranged between the fourth branch piece 30h and the other end of the second fixing piece 29f, the top and the bottom of the fourth spring 39 are both provided with a ring 36, the ring 36 at the top of the fourth spring 39 is sleeved on the other end of the second fixing piece 29f and is limited by an upward-inclining structure at the other end of the second fixing piece 29f, the ring 36 at the bottom of the fourth spring 39 is sleeved on the fourth supporting member 30h and is limited by the clamping end 34 of the fourth supporting member 30 h. When the device is used, the upper body 29a is fixed on the lower body 30a through the convex strips 29c, the two convex strips 29c respectively penetrate through the two through holes 30d, the holes 29d are exposed to the outside, the first fixing piece 29e and the second fixing piece 29f are respectively inserted into the two holes 29d in an inclined angle mode, then the ring 36 at the top of the first spring 35 is hung at one end of the first fixing piece 29e, the first spring 35 is stretched to hang the ring 36 at the bottom of the first spring 35 into the first outlet piece 30e, the first spring 35 is limited by the inclined structure of the first fixing piece 29e and the clamping end 34 of the first outlet piece 30e to be prevented from sliding out, the tensile force of the spring can ensure that the convex strips 29c are tensioned and cannot leave from the through holes 29d, and the hanging method of the second spring 37, the third spring 38 and the fourth spring 39 is the same as the fastening principle and is not repeated; when the upper press block 29 and the lower press block 30 are to be separated, the first spring 35 is stretched, the inclined angle slides out of the circular ring 36 at the top of the first spring 35 from the upward inclined structure at one end of the first fixing member 29e or slides out of the circular ring 36 at the bottom of the first spring 35 from the clamping end 34 of the first supporting member 30e, the rest three springs are sequentially taken down according to the mode, and the first fixing member 29e and the second fixing member 29f are taken out, so that the upper press block 29 and the lower press block 30 can be separated.

Referring to fig. 8 to 10, the shell side of each of the first tubular heat exchanger 9 and the second tubular heat exchanger 10 is a gas phase channel, the tube side of each of the first tubular heat exchanger 9 and the second tubular heat exchanger 10 is a liquid phase channel, the first tubular heat exchanger 9 and the second tubular heat exchanger 10 have the same structure and are horizontally arranged, the gas phase inlet pipe 25 of the first tubular heat exchanger and the gas phase inlet pipe of the second tubular heat exchanger are internally provided with a flow divider having the same structure, the flow divider comprises a cylindrical body 54, six flow dividing plates 54a in a right-angled ladder shape are uniformly distributed on the outer wall of the body 54, and the body 54 is connected to the gas phase inlet pipe 25 of the first tubular heat exchanger and the gas phase inlet pipe of the second tubular heat exchanger through a connecting piece 40.

Referring to fig. 1, the oil inlet 1, the pipeline turbulent heater 2, the thermostatic controller 3, the prefilter 4, the oil supply solenoid valve 5 and the oil inlet valve 6 are sequentially communicated through a pipeline, the oil inlet valve 6 is communicated with the oil delivery pipe 30b through the oil delivery pipe 42, the oil delivery pipe 30b is rotatably and vertically arranged on the oil delivery pipe 42, the top of the vacuum tank 24 is provided with an air outlet 24a, the vacuum gauge 8, the gas phase channel of the first tubular heat exchanger 9, the gas phase channel of the second tubular heat exchanger 10, the third-stage roots pump 11, the second-stage roots pump 12 and the gas-liquid separation tank 13 are sequentially communicated through a pipeline, the gas phase outlet of the gas-liquid separation tank 13, the vacuum check valve 15, the ripple compensator 16 and the vacuum pump 17 are sequentially communicated through a pipeline, the liquid phase outlet of the gas-liquid separation tank 13 is communicated with the water reservoir 14 through a pipeline, the bottom of the vacuum tank is provided with an oil delivery port 24b, the oil delivery port 24b, the oil pump 18, the fine filter 19 and the oil outlet 23 are communicated in sequence through pipelines; a first circulation section 41 is arranged between the outlet of the oil pump 18 and the oil inlet pipe 42, a first circulation valve 20 is arranged on the first circulation section 41, a second circulation section 43 is arranged between the outlet of the oil pump 18 and the inlet of the pipeline turbulent heater 2, a second circulation valve 21 is arranged on the second circulation section 43, a third circulation section 44 is arranged between the outlet of the fine filter 19 and the inlet of the pipeline turbulent heater 2, and a third circulation valve 22 is arranged on the third circulation section 44; a first secondary line 45 is arranged between the oil supply electromagnetic valve 5 and the oil inlet pipe 42, a first oil inlet valve 45a is arranged on the first secondary line 45, a first secondary circulation section 46 bypassing the first circulation valve 20 is arranged between the inlet and the outlet of the first circulation valve 20, and a first secondary circulation valve 46a is arranged on the first secondary circulation section 46; a first vacuum pressure controller 47 and a second vacuum pressure controller 48 are sequentially arranged on a pipeline between a gas phase outlet of the second tubular heat exchanger 10 and the three-stage roots pump 11, and a check valve 49, a pressure controller 50 and a pressure gauge 51 are sequentially arranged on a pipeline behind an outlet of the oil pump 18; the primary filter 4, the fine filter 19 and the water storage device 14 are all provided with a sewage discharge pipe, each sewage discharge pipe is provided with a sewage discharge valve 52, the bottom of the vacuum tank 24 is provided with an oil discharge valve 24c communicated with the vacuum tank 24, and an outlet pipeline of the fine filter 19 is provided with a sampling valve 53 communicated with a pipeline; the vacuum tank 24 is externally provided with a controller 24d for automatically controlling the starting of the oil pump 18 so as to control the oil level in the vacuum tank 24.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. High-efficient doublestage vacuum oil filtration system, including oil inlet (1), pipeline turbulent heater (2), thermostatic control ware (3), prefilter (4), fuel feeding solenoid valve (5), inlet valve (6), vacuum separator (7), vacuum gauge (8), first tubulation heat exchanger (9), second tubulation heat exchanger (10), tertiary lobe pump (11), second grade lobe pump (12), gas-liquid separation jar (13), water receiver (14), vacuum check valve (15), ripple compensator (16), vacuum pump (17), oil pump (18), secondary filter (19), oil-out (23), its characterized in that:

the vacuum separation device (7) comprises a vacuum tank (24), an atomizer (26) arranged in the vacuum tank (24), a foam sensor (27) arranged on the inner wall of the vacuum tank (24) below the atomizer (26), and an air permeation pipe (28), wherein one end of the air permeation pipe (28) is arranged in the vacuum tank (24), the other end of the air permeation pipe penetrates out of the vacuum tank (24), an air permeation valve (28 a) is arranged on the air permeation pipe (28) outside the vacuum tank (24), and an air permeation hole (28 b) is arranged on the air permeation pipe (28) in the vacuum tank (24);

the atomizer (26) comprises an upper pressing block (29) and a lower pressing block (30), the lower pressing block (30) comprises a lower body (30 a) in a cylindrical shape and an oil conveying pipe (30 b) arranged at the bottom of the lower body (30 a), an oil passage (30 c) longitudinally penetrating through the lower body (30 a) is arranged at the center of the lower body (30 a), the cross section of the oil passage (30 c) is circular, a plurality of lower oil spraying grooves (31) are arranged on the top surface of the lower body (30 a), each lower oil spraying groove (31) comprises a first lower oil spraying groove (31 a) and a second lower oil spraying groove (31 b), the first lower oil spraying groove (31 a) is arranged along the tangential direction of the oil passage (30 c), one end of the first lower oil spraying groove (31 a) is communicated with the oil passage (30 c), and the other end of the first lower oil spraying groove (31 a) is communicated with the second lower oil spraying groove (31 b), the second lower oil spraying groove (31 b) extends to the outer wall of the lower body (30 a), an included angle alpha between the first lower oil spraying groove (31 a) and the second lower oil spraying groove (31 b) is 145 degrees, two through holes (30 d) longitudinally penetrating through the lower body (30 a) are formed in the lower body (30 a), the oil delivery pipe (30 b) is communicated with an oil passage channel (30 c), the central shaft of the oil delivery pipe (30 b) is coaxial with the central shaft of the oil passage channel (30 c), and the two through holes (30 d) are symmetrical about the central shaft of the oil passage channel (30 c);

the upper pressing block (29) comprises an upper cylindrical body (29 a) used for being matched with a lower body (30 a), the top of the upper body (29 a) is provided with a motor (29 b) for driving the upper body (29 a) to rotate along the central shaft of the upper body (29 a), the bottom surface of the upper body (29 a) is provided with a plurality of upper oil spraying grooves (32) matched with lower oil spraying grooves (31), each upper oil spraying groove (32) comprises a first upper oil spraying groove (32 a) corresponding to the first lower oil spraying groove (31 a) and a second upper oil spraying groove (32 b) corresponding to the second lower oil spraying groove (31 b), and the upper oil spraying grooves (32) and the lower oil spraying grooves (31) are matched to form an oil spraying hole (33) for sending oil out of the atomizer (26) from an oil conveying pipe (30 b);

go up body (29 a) bottom and establish two cooperation down sand grip (29 c) of body (30 a) through-hole (30 d), the length of sand grip (29 c) is greater than the length of through-hole (30 d), and hole (29 d) that transversely run through sand grip (29 c) are all established to every sand grip (29 c) bottom, and when sand grip (29 c) inserted through-hole (30 d), set up strip mounting in hole (29 d) with drawing and inserting, the mounting includes first mounting (29 e), second mounting (29 f), the structure that inclines all is established at the both ends of first mounting (29 e), second mounting (29 f), set up first fixed part (30 e), second fixed part (30 f) on defeated oil pipe (30 b) outer wall of first mounting (29 e) below branch, set up third branch on defeated oil pipe (30 b) outer wall of second mounting (29 f) below branch and go out (30 g), A fourth branch piece (30 h), wherein the distance from the first branch piece (30 e) to the bottom of the oil pipeline (30 b) is greater than the distance from the second branch piece (30 f) to the bottom of the oil pipeline (30 b), the distance from the third branch piece (30 g) to the bottom of the oil pipeline (30 b) is greater than the distance from the fourth branch piece (30 h) to the bottom of the oil pipeline (30 b), the first branch piece (30 e), the second branch piece (30 f) and the first fixing piece (29 e) are coplanar, the third branch piece (30 g), the fourth branch piece (30 h) and the second fixing piece (29 f) are coplanar, and the first branch piece (30 e), the second branch piece (30 f), the third branch piece (30 g) and the fourth branch piece (30 h) are symmetrical about the central axis of the oil pipeline (30 b);

first play piece (30 e), second play piece (30 f) deviate from defeated oil pipe (30 b) one end and all set up joint end (34) perpendicularly downwards, detachably is equipped with first spring (35) between first play piece (30 e) and first mounting (29 e) one end, ring (36) are all established to first spring (35) top, bottom, first mounting (29 e) one end is located in ring (36) cover at first spring (35) top and by the structure of inclining upward of first mounting (29 e) one end spacing, first play piece (30 e) is located in ring (36) cover of first spring (35) bottom and by the joint end (34) of first play piece (30 e) spacing, detachably is equipped with second spring (37) between second play piece (30 f) and the first mounting (29 e) other end, second spring (37) top, The bottom parts of the first supporting piece (29 e) and the second supporting piece (30 f) are respectively provided with a circular ring (36), the circular ring (36) at the top part of the second spring (37) is sleeved at the other end of the first supporting piece (29 e) and limited by an upward inclining structure at the other end of the first supporting piece (29 e), and the circular ring (36) at the bottom part of the second spring (37) is sleeved at the second supporting piece (30 f) and limited by a clamping end (34) of the second supporting piece (30 f);

third play piece (30 g), fourth play piece (30 h) deviate from defeated oil pipe (30 b) one end and all set up joint end (34) downwards perpendicularly, detachably is equipped with third spring (38) between third play piece (30 g) and second mounting (29 f) one end, ring (36) are all established to third spring (38) top, bottom, ring (36) are established to the cover of ring (36) at third spring (38) top are located second mounting (29 f) one end and are spacing by the tilt-up structure of second mounting (29 f) one end, ring (36) cover of third spring (38) bottom are located third play piece (30 g) and are spacing by joint end (34) of third play piece (30 g), detachably is equipped with fourth spring (39) between fourth play piece (30 h) and the second mounting (29 f) other end, fourth spring (39) top, fourth spring (39), The bottom parts of the first spring (39) are respectively provided with a circular ring (36), the circular ring (36) at the top part of the fourth spring (39) is sleeved at the other end of the second fixing piece (29 f) and limited by an upward-inclining structure at the other end of the second fixing piece (29 f), and the circular ring (36) at the bottom part of the fourth spring (39) is sleeved at the fourth supporting piece (30 h) and limited by a clamping end (34) of the fourth supporting piece (30 h);

the shell side of each of the first tubular heat exchanger (9) and the second tubular heat exchanger (10) is a gas phase channel, the tube side of each of the first tubular heat exchanger (9) and the second tubular heat exchanger (10) is a liquid phase channel, a gas phase inlet pipe (25) of each of the first tubular heat exchanger and the second tubular heat exchanger is internally provided with a flow dividing device, each flow dividing device comprises a cylindrical body (54), six flow dividing sheets (54 a) in a right-angle ladder shape are uniformly distributed on the outer wall of the body (54), and the bodies (54) are connected into the gas phase inlet pipe (25) of the first tubular heat exchanger and the gas phase inlet pipe of the second tubular heat exchanger through connecting pieces (40);

the oil inlet (1), the pipeline turbulent flow heater (2), the thermostatic controller (3), the prefilter (4), the oil supply electromagnetic valve (5) and the oil inlet valve (6) are sequentially communicated through a pipeline, the oil inlet valve (6) is communicated with an oil delivery pipe (30 b) through an oil delivery pipe (42), the oil delivery pipe (30 b) is rotatably and vertically arranged on the oil delivery pipe (42), an air outlet (24 a) is formed in the top of the vacuum tank (24), the air outlet (24 a), the vacuum gauge (8), a gas phase channel of the first tubular heat exchanger (9), a gas phase channel of the second tubular heat exchanger (10), the third-stage roots pump (11), the second-stage roots pump (12) and the gas-liquid separation tank (13) are sequentially communicated through pipelines, and a gas phase outlet of the gas-liquid separation tank (13), the vacuum one-way valve (15), the ripple compensator (16) and the vacuum pump (17) are sequentially communicated through pipelines, a liquid phase outlet of the gas-liquid separation tank (13) is communicated with a water storage device (14) through a pipeline, an oil delivery port (24 b) is formed in the bottom of the vacuum tank (24), and the oil delivery port (24 b), the oil pump (18), the fine filter (19) and the oil outlet (23) are sequentially communicated through pipelines;

a first circulation section (41) is arranged between an outlet of the oil pump (18) and the oil inlet pipe (42), a first circulating valve (20) is arranged on the first circulation section (41), a second circulation section (43) is arranged between the outlet of the oil pump (18) and an inlet of the pipeline turbulent flow heater (2), a second circulating valve (21) is arranged on the second circulation section (43), a third circulation section (44) is arranged between an outlet of the fine filter (19) and the inlet of the pipeline turbulent flow heater (2), and a third circulating valve (22) is arranged on the third circulation section (44);

a first secondary line (45) is arranged between the oil supply electromagnetic valve (5) and the oil inlet pipe (42), a first oil inlet valve (45 a) is arranged on the first secondary line (45), a first secondary circulation section (46) bypassing the first circulation valve (20) is arranged between the inlet and the outlet of the first circulation valve (20), and a first secondary circulation valve (46 a) is arranged on the first secondary circulation section (46).

2. The high efficiency dual stage vacuum oil filter system of claim 1 wherein: a first vacuum pressure controller (47) and a second vacuum pressure controller (48) are sequentially arranged on a pipeline between a gas phase outlet of the second tubular heat exchanger (10) and the three-stage roots pump (11), and a check valve (49), a pressure controller (50) and a pressure gauge (51) are sequentially arranged on the pipeline behind an outlet of the oil pump (18).

3. The high efficiency dual stage vacuum oil filter system of claim 1 wherein: the sewage treatment device is characterized in that sewage pipes are arranged on the primary filter (4), the fine filter (19) and the water receiver (14), a sewage valve (52) is arranged on each sewage pipe, an oil drain valve (24 c) communicated with the vacuum tank (24) is arranged at the bottom of the vacuum tank (24), and a sampling valve (53) communicated with a pipeline is arranged on an outlet pipeline of the fine filter (19).

4. The high efficiency dual stage vacuum oil filter system of claim 1 wherein: and a controller (24 d) which is arranged outside the vacuum tank (24) and automatically controls the starting of the oil pump (18) so as to control the oil level in the vacuum tank (24).