CN213835174U - Vacuum pump lubricating oil treatment and recycling device - Google Patents
Vacuum pump lubricating oil treatment and recycling device Download PDFInfo
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- CN213835174U CN213835174U CN202023047803.2U CN202023047803U CN213835174U CN 213835174 U CN213835174 U CN 213835174U CN 202023047803 U CN202023047803 U CN 202023047803U CN 213835174 U CN213835174 U CN 213835174U
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Abstract
The utility model discloses a vacuum pump lubricating oil treatment recycling device, including tubular centrifuge and waste oil storage tank, waste oil storage tank is connected with the waste oil input pump through waste oil storage tank input pipeline, tubular centrifuge is connected with the waste oil storage tank through tubular centrifuge feed line, tubular centrifuge is connected with the after-centrifugation fluid jar through the straight-line pipeline of centrifugation fluid, tubular centrifuge is connected with the waste oil storage tank through the oil-mixing backflow pipeline, the tubular centrifuge feed line is equipped with centrifuge feed pump, the after-centrifugation fluid jar is connected with the vacuum evaporation tank through the evaporation tank feed line, the vacuum evaporation tank is connected with the vacuum buffer tank through the evaporation tank evacuation pipeline, the evaporation tank evacuation pipeline is equipped with the condenser; degree of automation is high, and is high to the application degree of waste oil, can get rid of impurity such as mechanical impurity in the waste oil, fatlute, moisture, carbon dust, tar, acid value to resume original performance, supply the board to use, reduce the useless emission of danger, reduce the use cost of board.
Description
Technical Field
The utility model relates to a vacuum pump lubricating oil handles retrieval and utilization technical field, specifically is a vacuum pump lubricating oil handles retrieval and utilization device.
Background
In the processes of vacuum heat treatment, vacuum cracking and production of carbon-carbon and carbon-ceramic composite materials, a vacuum pump is required to provide a high-quality vacuum environment. During the use of the vacuum pump, because the atmosphere in the furnace chamber is complex, a large amount of carbon powder, tar, metal particles and other organic impurities are generated in the cracking and material processing processes, and the impurities enter the vacuum pump along with the gas to pollute the lubricating oil in the pump. The viscosity of the polluted lubricating oil is sharply reduced, and the vacuum degree requirement required by the process cannot be maintained; at the same time, the movable parts of the rotor, such as the impeller, the gear and the like in the pump are abraded, the service life of the equipment is shortened, and the equipment needs to be replaced in time.
The replaced lubricating oil is the lubricating oil of the waste vacuum pump (hereinafter referred to as waste oil), the waste oil contains a large amount of carbon powder, tar, mechanical impurities and other organic impurities, a filter is easily blocked by the traditional filtering means, and the tar in the filter cannot be removed in a filtering manner.
Based on this, the utility model designs a retrieval and utilization device is handled to vacuum pump lubricating oil to solve the above-mentioned problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a retrieval and utilization device is handled to vacuum pump lubricating oil, degree of automation is high, and is high to the application degree of waste oil, can get rid of impurity such as mechanical impurity in the waste oil, fatlute, moisture, carbon dust, tar, acid value to resume original performance, supply the board to use, reduce the useless emission of danger, reduce the use cost of board, with the problem of proposing in solving above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a vacuum pump lubricating oil treatment and recycling device comprises a tubular centrifugal machine, a vacuum evaporation tank, a waste oil input pump, a waste oil storage tank, a centrifuged oil tank, a vacuum buffer tank, a condensation water tank, a decolorizer and a vacuum pump, wherein the waste oil storage tank is connected with the waste oil input pump through a waste oil storage tank input pipeline, the tubular centrifugal machine is connected with the waste oil storage tank through a tubular centrifugal machine feeding pipeline, the tubular centrifugal machine is connected with a centrifuged oil tank through a centrifuged oil straight pipeline, the tubular centrifugal machine is connected with the waste oil storage tank through a mixed oil return pipeline, a centrifugal machine feeding pump is arranged on the tubular centrifugal machine feeding pipeline, the centrifuged oil tank is connected with the vacuum evaporation tank through an evaporation tank feeding pipeline, the vacuum evaporation tank is connected with the vacuum buffer tank through an evaporation tank vacuumizing pipeline, and a condenser is arranged on the evaporation tank vacuumizing pipeline, the vacuum evaporation tank is connected with the centrifugal rear oil tank through a dehydrated rear oil return pipeline, the vacuum evaporation tank is connected with a dehydrated rear oil output pump through a dehydrated rear oil discharge pipeline, the dehydrated rear oil output pump is connected with a decolorizer through a decolorizer feeding pipeline, the vacuum buffer tank is connected with a condensation water tank through a one-level drainage pipeline, the condenser is connected with the one-level drainage pipeline through a condenser drainage pipeline, and the vacuum buffer tank is connected with a vacuum pump through a vacuum pump air suction pipeline.
Preferably, be connected with waste oil input pipeline on the waste oil input pump, the waste oil storage tank lower part is connected with waste oil input pipeline through circulation heating pipeline, be equipped with waste oil input control valve on the waste oil input pipeline, be equipped with strong magnetic filter, coarse filter and first heater on the waste oil storage tank input pipeline.
Preferably, a circulation heating control valve is arranged on the circulation heating pipeline, and a first liquid level switch, a second liquid level switch, a first temperature switch and a waste oil storage tank stirrer are arranged on the waste oil storage tank.
Preferably, an oil cleanliness sensor and a centrifugal oil direct-discharge control valve are arranged on the centrifugal oil direct-discharge pipeline, an oil mixing reflux control valve is arranged on the oil mixing reflux pipeline, and a vibration sensor is arranged on the tubular centrifugal machine.
Preferably, be equipped with second heater, second temperature switch and evaporating pot feeding control valve on the evaporating pot inlet pipe way, be equipped with dehydration back fluid backward flow control valve on the dehydration back fluid backflow pipeline, be equipped with dehydration back fluid discharge control valve on the dehydration back fluid discharge pipeline, be equipped with decoloriser feeding control valve on the decoloriser inlet pipe way, be equipped with fifth liquid level switch, sixth liquid level switch and evaporating pot pressure transmitter on the vacuum evaporating pot.
Preferably, be equipped with the vacuum on the vacuum buffer tank and destroy the pipeline, be equipped with vacuum pump exhaust pipe on the vacuum pump, the condensation water pitcher is equipped with second grade drainage pipe, the decolorant is equipped with finished product recovery oil output pipeline, be equipped with one-level drainage control valve on the one-level drainage pipe, be equipped with the decolorant manometer on the decolorant, be equipped with seventh liquid level switch and eighth liquid level switch on the condensation water pitcher.
Preferably, a vacuum breaking valve is arranged on the vacuum breaking pipeline, and a secondary drainage control valve is arranged on the secondary drainage pipeline.
Preferably, the waste oil input pump, the first heater, the first temperature switch, the centrifuge charge pump, tubular centrifuge, vibration sensor, oil cleanliness sensor, the fourth liquid level switch, the oil mixing backflow control valve, the straight control valve of centrifugal fluid, evaporating pot feed control valve, the second temperature switch, the fifth liquid level switch, the second heater, the sixth liquid level switch, the control valve of fluid discharge after dehydration, decolorant feed control valve, the decolorant manometer, the seventh liquid level switch, the eighth liquid level switch, second grade water discharge control valve, one-level water discharge control valve, the vacuum pump, the vacuum destroys the valve, evaporating pot pressure transmitter, the second liquid level switch, the waste oil storage tank mixer, first liquid level switch and cyclic heating control valve all with outside PLC control panel electric connection.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a tubular centrifuge carries out first solid-liquid separation, and tubular centrifuge rotational speed is high, and the separation factor is big, can effectually get rid of most impurity such as carbon dust in the waste oil, tar.
2. The utility model discloses degree of automation is high, need not too much participation of personnel, accomplishes work such as centrifugation, dehydration, degasification, decoloration automatically, and direct output finished product fluid saves the manual work.
3. The utility model discloses utilize oil cleanliness factor sensor to carry out the dielectric constant and measure, quality that can effectual detection oil helps automatic integration.
4. The utility model discloses transporting of material basically goes on in equipment and pipeline, and on-the-spot cleanliness is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution for processing and recycling lubricating oil of a vacuum pump: comprises a tubular centrifugal machine 12, a vacuum evaporation tank 28, a waste oil input pump 3, a waste oil storage tank 8, a centrifugal oil tank 19, a vacuum buffer tank 50, a condensation water tank 44, a decoloriser 36 and a vacuum pump 47, wherein the waste oil storage tank 8 is connected with the waste oil input pump 3 through a waste oil storage tank input pipeline 7, the tubular centrifugal machine 12 is connected with the waste oil storage tank 8 through a tubular centrifugal machine feeding pipeline 21, the tubular centrifugal machine 12 is connected with the centrifugal oil tank 19 through a centrifugal oil straight-discharging pipeline 18, the tubular centrifugal machine 12 is connected with the waste oil storage tank 8 through a mixed oil return pipeline 11, the tubular centrifugal machine feeding pipeline 21 is provided with a centrifugal machine feeding pump 10, the centrifugal oil tank 19 is connected with the vacuum evaporation tank 28 through an evaporation tank feeding pipeline 24, and the vacuum evaporation tank 28 is connected with the vacuum buffer tank 50 through an evaporation tank vacuum pumping pipeline 31, be equipped with condenser 53 on the evaporating pot evacuation pipeline 31, oil return line 20 is connected with centrifugation back oil liquid jar 19 after the vacuum evaporating pot 28 is through dehydration, oil discharge line 30 is connected with dehydration back oil delivery pump 32 after the vacuum evaporating pot 28 is through dehydration, dehydration back oil delivery pump 32 is connected with decoloriser 36 through decoloriser feed line 34, vacuum buffer 50 is connected with condensation water tank 44 through one-level water drainage pipeline 45, condenser 53 is connected with one-level water drainage pipeline 45 through condenser water drainage pipeline 39, vacuum buffer 50 is connected with vacuum pump 47 through vacuum pump aspiration line 48.
Wherein, be connected with waste oil input pipeline 1 on the waste oil input pump 3, 8 lower parts of waste oil storage tank are connected with waste oil input pipeline 1 through circulation heating pipeline 57, be equipped with waste oil input control valve 2 on the waste oil input pipeline 1, be equipped with strong magnetic filter 4, coarse filter 5 and first heater 6 on the waste oil storage tank input pipeline 7, be equipped with circulation heating control valve 59 on the circulation heating pipeline 57, 8 are equipped with first liquid level switch 58, second liquid level switch 55, first temperature switch 9 and waste oil storage tank mixer 56 on the waste oil storage tank.
The centrifugal oil direct discharging pipeline 18 is provided with an oil cleanliness sensor 14 and a centrifugal oil direct discharging control valve 17, the oil mixing backflow pipeline 11 is provided with an oil mixing backflow control valve 16, and the tubular centrifuge 12 is provided with a vibration sensor 13.
Wherein, be equipped with second heater 26, second temperature switch 23 and evaporating pot feeding control valve 22 on the evaporating pot feed line 24, be equipped with dehydration back fluid backward flow control valve 33 on the dehydration back fluid return line 20, be equipped with dehydration back fluid discharge control valve 29 on the dehydration back fluid discharge pipeline 30, be equipped with decoloriser feeding control valve 35 on the decoloriser feed line 34, be equipped with fifth liquid level switch 25, sixth liquid level switch 27 and evaporating pot pressure transmitter 54 on the vacuum evaporation jar 28.
Wherein, be equipped with vacuum destruction pipeline 51 on the vacuum buffer tank 50, be equipped with vacuum pump exhaust pipe 49 on the vacuum pump 47, condensation water pitcher 44 is equipped with second grade drainage pipe 42, decolorant 36 is equipped with finished product recovery oil output pipeline 38, be equipped with one-level water discharge control valve 46 on the one-level drainage pipe 45, be equipped with decolorant manometer 37 on the decolorant 36, be equipped with seventh liquid level switch 40 and eighth liquid level switch 41 on the condensation water pitcher 44, be equipped with vacuum destruction valve 52 on the vacuum destruction pipeline 51, be equipped with second grade water discharge control valve 43 on the second grade drainage pipe 42.
Wherein the waste oil input pump 3, the first heater 6, the first temperature switch 9, the centrifuge feed pump 10, tubular centrifuge 12, vibration sensor 13, oil cleanliness sensor 14, fourth liquid level switch 15, oil mixing backflow control valve 16, centrifugal oil direct discharge control valve 17, evaporating pot feeding control valve 22, second temperature switch 23, fifth liquid level switch 25, second heater 26, sixth liquid level switch 27, dehydrated oil discharge control valve 29, decolorizer feeding control valve 35, decolorizer pressure gauge 37, seventh liquid level switch 40, eighth liquid level switch 41, secondary water discharge control valve 43, primary water discharge control valve 46, vacuum pump 47, vacuum break valve 52, evaporating pot pressure transmitter 54, second liquid level switch 55, waste oil storage tank stirrer 56, first liquid level switch 58 and cyclic heating control valve 59 are all electrically connected with an external PLC control panel.
The specific working principle is as follows:
insert the waste oil bucket of on-the-spot collection waste oil with waste oil input pipeline 1's end, the waste oil carries to waste oil storage tank 8 through waste oil input pump 3, strong magnetic filter 4, coarse filter 5, first heater 6, carries out simple filtration to waste oil. After first liquid level switch 58 reachs, output signal to PLC, by PLC control, open circulation heating control valve 59, close waste oil input control valve 2, carry out circulation heating with the waste oil in the waste oil storage tank 3, after the temperature of taking first temperature switch 9 reachs, output signal to PLC stops waste oil input pump 3 by PLC control.
Starting tubular centrifuge 12, after waiting that the rotational speed is stable, starting centrifuge charge pump 10, opening miscella reflux control valve 16 earlier, close the direct discharge control valve 17 of centrifugal fluid, measure the oil cleanliness factor through oil cleanliness factor sensor 14, after reaching the target, output signal to PLC, by PLC control, open the direct discharge control valve 17 of centrifugal fluid, close miscella reflux control valve 16, carry the fluid after the centrifugation to the fluid jar 19 after the centrifugation.
And starting the vacuum pump 47, outputting a signal to the PLC after the pressure transmitter 54 of the evaporation tank reaches a target value, opening the feeding control valve 22 of the evaporation tank under the control of the PLC, and enabling the oil to enter the vacuum evaporation tank 28 through the second heater 26. And after the fifth liquid level switch 25 arrives, outputting a signal to the PLC, controlling by the PLC, starting the dehydrated oil output pump 32, opening the dehydrated oil discharge control valve 29 and the dehydrated oil reflux control valve 33, closing the decolorant feeding control valve 35, and performing cyclic heating, dehydration and degassing on the oil. And after the second temperature switch 23 is reached, outputting a signal to the PLC, and turning off the second heater 26 under the control of the PLC to prevent dry burning. And after the circulation time is met, opening a feeding control valve 35 of the decolorizer, closing a dehydrated oil backflow control valve 33, and decolorizing the dehydrated oil, wherein the treated oil is the finished product recovered oil. After the fourth liquid level switch 15 is reached, a signal is output to the PLC, namely the oil in the oil tank after centrifugation is processed, and the PLC controls the vacuum pump 47 to be closed; after the sixth liquid level switch 27 is reached, a signal is output to the PLC, which indicates that the oil in the vacuum evaporation tank 28 is also completely conveyed, and at this time, the PLC controls to turn off the dehydrated oil output pump 32.
The vacuum pump 47 vacuumizes the vacuum evaporation tank 28 through the condenser 53 and the vacuum buffer tank 50, the water vapor is condensed into liquid water in the condenser 53, the liquid water flows into the condensed water tank 44 through the primary water drainage pipeline 45, when the seventh liquid level switch reaches 40, a signal is output to the PLC, namely the PLC indicates that the water amount in the condensed water tank 44 reaches a high level, at the moment, the PLC controls to close the primary water drainage control valve 46, open the secondary water drainage control valve 43 and drain water; and after the eighth liquid level switch 41 arrives, outputting a signal to the PLC to indicate that the water is completely discharged, and controlling by the PLC to close the secondary water discharge control valve 43 and open the primary water discharge control valve 46 to perform the next batch of circulation.
The utility model discloses a control mode controls through PLC control panel, and PLC control panel's control circuit can realize through the simple programming of technical staff in this field, and the providing of power also belongs to the common general knowledge in this field, and the utility model discloses mainly used protects mechanical device, so the utility model discloses no longer explain control mode and circuit connection in detail.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. The utility model provides a vacuum pump lubricating oil handles retrieval and utilization device which characterized in that: comprises a tubular centrifugal machine (12), a vacuum evaporation tank (28), a waste oil input pump (3), a waste oil storage tank (8), a centrifugal back oil tank (19), a vacuum buffer tank (50), a condensation water tank (44), a decolorant (36) and a vacuum pump (47), wherein the waste oil storage tank (8) is connected with the waste oil input pump (3) through a waste oil storage tank input pipeline (7), the tubular centrifugal machine (12) is connected with the waste oil storage tank (8) through a tubular centrifugal machine feeding pipeline (21), the tubular centrifugal machine (12) is connected with the centrifugal back oil tank (19) through a centrifugal oil direct discharge pipeline (18), the tubular centrifugal machine (12) is connected with the waste oil storage tank (8) through a mixed oil return pipeline (11), a centrifugal machine feeding pump (10) is arranged on the tubular centrifugal machine feeding pipeline (21), and the centrifugal back oil tank (19) is connected with the vacuum evaporation tank (28) through an evaporation tank feeding pipeline (24), the vacuum evaporation tank (28) is connected with a vacuum buffer tank (50) through an evaporation tank vacuum pumping pipeline (31), a condenser (53) is arranged on the evaporation tank vacuumizing pipeline (31), the vacuum evaporation tank (28) is connected with the centrifuged oil liquid tank (19) through a dehydrated oil liquid return pipeline (20), the vacuum evaporation tank (28) is connected with a dehydrated oil output pump (32) through a dehydrated oil discharge pipeline (30), the dehydrated oil liquid output pump (32) is connected with a decolorant (36) through a decolorant feeding pipeline (34), the vacuum buffer tank (50) is connected with the condensed water tank (44) through a primary drainage pipeline (45), the condenser (53) is connected with a first-stage drain pipeline (45) through a condenser drain pipeline (39), the vacuum buffer tank (50) is connected with a vacuum pump (47) through a vacuum pump pumping pipeline (48).
2. The vacuum pump lubricating oil treatment and recycling device according to claim 1, wherein: the oil-water separator is characterized in that an oil input pipeline (1) is connected to the oil input pump (3), the lower portion of the oil storage tank (8) is connected with the oil input pipeline (1) through a circulating heating pipeline (57), an oil input control valve (2) is arranged on the oil input pipeline (1), and a strong magnetic filter (4), a coarse filter (5) and a first heater (6) are arranged on the oil storage tank input pipeline (7).
3. The vacuum pump lubricating oil treatment and recycling device according to claim 2, wherein: and a circulating heating control valve (59) is arranged on the circulating heating pipeline (57), and a first liquid level switch (58), a second liquid level switch (55), a first temperature switch (9) and a waste oil storage tank stirring machine (56) are arranged on the waste oil storage tank (8).
4. The vacuum pump lubricating oil treatment and recycling device according to claim 1, wherein: be equipped with oil cleanliness factor sensor (14) and the direct control valve (17) of centrifugal fluid on centrifugal fluid direct discharge pipeline (18), be equipped with contaminated oil backward flow control valve (16) on contaminated oil return line (11), be equipped with vibration sensor (13) on tubular centrifuge (12).
5. The vacuum pump lubricating oil treatment and recycling device according to claim 1, wherein: be equipped with second heater (26), second temperature switch (23) and evaporating pot feeding control valve (22) on evaporating pot feed line (24), be equipped with dehydration back fluid backflow control valve (33) on dehydration back fluid return line (20), be equipped with dehydration back fluid discharge control valve (29) on dehydration back fluid discharge line (30), be equipped with decoloriser feeding control valve (35) on decoloriser feed line (34), be equipped with fifth liquid level switch (25), sixth liquid level switch (27) and evaporating pot pressure transmitter (54) on vacuum evaporation jar (28).
6. The vacuum pump lubricating oil treatment and recycling device according to claim 1, wherein: be equipped with vacuum destruction pipeline (51) on vacuum buffer tank (50), be equipped with vacuum pump exhaust pipe (49) on vacuum pump (47), condensation water pitcher (44) are equipped with second grade water drainage pipeline (42), decolorant (36) are equipped with finished product recovery oil output pipeline (38), be equipped with one-level water drainage control valve (46) on one-level water drainage pipeline (45), be equipped with decolorant manometer (37) on decolorant (36), be equipped with seventh liquid level switch (40) and eighth liquid level switch (41) on condensation water pitcher (44).
7. The vacuum pump lubricating oil treatment and recycling device according to claim 6, wherein: and a vacuum breaking valve (52) is arranged on the vacuum breaking pipeline (51), and a secondary drainage control valve (43) is arranged on the secondary drainage pipeline (42).
8. The vacuum pump lubricating oil treatment and recycling device according to any one of claims 1 to 7, wherein: the waste oil feeding device comprises a waste oil input pump (3), a first heater (6), a first temperature switch (9), a centrifuge feeding pump (10), a tubular centrifuge (12), a vibration sensor (13), an oil cleanliness sensor (14), a fourth liquid level switch (15), an oil mixing backflow control valve (16), a centrifugal oil direct discharge control valve (17), an evaporation tank feeding control valve (22), a second temperature switch (23), a fifth liquid level switch (25), a second heater (26), a sixth liquid level switch (27), a dehydrated oil discharge control valve (29), a decolorizer feeding control valve (35), a decolorizer pressure gauge (37), a seventh liquid level switch (40), an eighth liquid level switch (41), a secondary water discharge valve (43), a primary water discharge control valve (46), a vacuum pump (47), a vacuum destruction valve (52), an evaporation pressure tank transmitter (54), a water control valve (40), a vacuum pump control valve (47), a vacuum pump control valve (52), a control valve (24), a control valve (2), a control valve (I) and a control valve (17), The second liquid level switch (55), the waste oil storage tank stirrer (56), the first liquid level switch (58) and the circulating heating control valve (59) are electrically connected with an external PLC control panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023047803.2U CN213835174U (en) | 2020-12-18 | 2020-12-18 | Vacuum pump lubricating oil treatment and recycling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023047803.2U CN213835174U (en) | 2020-12-18 | 2020-12-18 | Vacuum pump lubricating oil treatment and recycling device |
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| Publication Number | Publication Date |
|---|---|
| CN213835174U true CN213835174U (en) | 2021-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023047803.2U Active CN213835174U (en) | 2020-12-18 | 2020-12-18 | Vacuum pump lubricating oil treatment and recycling device |
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|---|---|
| CN (1) | CN213835174U (en) |
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- 2020-12-18 CN CN202023047803.2U patent/CN213835174U/en active Active
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