CN113864188A - Two-stage screw air compressor oil return device and method for reducing oil stirring loss - Google Patents
Two-stage screw air compressor oil return device and method for reducing oil stirring loss Download PDFInfo
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- CN113864188A CN113864188A CN202110839596.4A CN202110839596A CN113864188A CN 113864188 A CN113864188 A CN 113864188A CN 202110839596 A CN202110839596 A CN 202110839596A CN 113864188 A CN113864188 A CN 113864188A
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- 239000003921 oil Substances 0.000 title claims abstract description 336
- 238000003756 stirring Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000010725 compressor oil Substances 0.000 title claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 116
- 238000007906 compression Methods 0.000 claims abstract description 116
- 239000010687 lubricating oil Substances 0.000 claims description 26
- 230000001050 lubricating effect Effects 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 description 18
- 238000000926 separation method Methods 0.000 description 11
- 238000001816 cooling Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/021—Control systems for the circulation of the lubricant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/028—Means for improving or restricting lubricant flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses a two-stage screw air compressor oil return device and a method for reducing oil stirring loss, the device changes the method that high-temperature oil which flows through a gear and a bearing and high-temperature oil which is cooled in a first-stage compression cavity and a middle cavity are all sent into a second-stage compression cavity, the oil is directly sent to an oil separator after second-stage exhaust, the oil return through the second-stage compression cavity is realized through an external pipeline and an oil pump, and the oil stirring loss of a rotor in the second-stage compression cavity is reduced.
Description
Technical Field
The invention belongs to the technical field of screw air compressors, and particularly relates to a two-stage screw air compressor oil return device and method for reducing oil stirring loss.
Background
The screw air compressor is widely applied to industries such as food, chemical engineering and the like due to the advantages of high efficiency, convenient operation, strong adaptability, low maintenance cost and the like under the working conditions of medium pressure and low pressure. The screw air compressor adopts the two-stage compression structure, can effectively improve the pressure ratio, reduces exhaust temperature simultaneously. In the two-stage screw compressor, the oil injection position is provided with a first-stage compression cavity, a second-stage compression cavity, an intermediate cavity, a bearing and a gear. The injected oil has the functions of lubrication, sealing, cooling, noise reduction and the like. But oil injection also increases the churning loss of the screw.
Patent CN201910531240.7 proposes a solution to the problem of oil accumulation in the middle cavity existing in the horizontal two-stage screw compressor, for reducing the oil churning loss of the motor and the heat loss caused by oil backflow to the low-pressure stage. This patent uses pressure differential to direct oil from the intermediate chamber to a side near the primary compression chamber to a side near the secondary compression chamber or directly to the secondary compression chamber. Through the improvement, the oil stirring loss caused by oil deposition at the motor is reduced, meanwhile, the heating of the oil to the primary exhaust is reduced, and the heat loss is reduced. The above patent only solves the problem of oil accumulation in the middle cavity, and does not reduce the oil stirring loss of the screw. Oil from the first-stage and the middle cavity enters the second-stage compression cavity, the oil temperature is high, the cooling effect cannot be achieved, and the oil stirring loss of the second-stage screw rod can be increased.
In summary, the influence of the oil stirring loss of the screw in the compression cavity on the performance of the compressor in the oil return process is not considered in the prior art and the prior patent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an oil return device and method of a two-stage screw air compressor for reducing oil stirring loss, so that the purpose of reducing the oil stirring loss in a compression cavity is achieved. This not only increases the energy efficiency of the compressor, but also improves the reliability of the compressor.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a two-stage screw air compressor oil return device capable of reducing oil stirring loss comprises an oil separator, wherein the oil separator is connected with an oil cooler, the oil cooler is connected with an oil filter, and the output end of the oil filter is divided into two oil paths, namely a first oil path and a second oil path;
the second oil way is connected to the secondary compression cavity, the first oil way is connected to a cavity where other devices are located, and the other devices comprise a first part device and a second part device;
the oil output end of the cavity where the first part of device is located is communicated with the second-stage compression cavity, the oil output end or the oil-gas output end of the second-stage compression cavity is connected to the oil separator, and the oil output end of the cavity where the second part of device is located is connected to the oil separator through an external oil way.
The invention is further improved in that:
preferably, the second part device comprises a bearing and a gear, and a gear box is arranged on the external oil circuit; the oil output end of the cavity where the bearing is located and the oil output end of the cavity where the gear is located are both communicated with the gear box, and the gear box is connected to the oil separator.
Preferably, an oil pump is arranged between the gear box and the oil separator.
Preferably, the first part device is a first-stage rotor, the first-stage rotor is installed in a first-stage compression cavity, an oil output end of the first-stage compression cavity is connected to an intermediate cavity, and an oil output end of the intermediate cavity is connected to a second-stage compression cavity.
Preferably, the first-stage compression cavity is communicated with the first oil path through a third oil path, and the intermediate cavity is arranged on the second oil path.
Preferably, the second part of the device comprises a first-stage suction bearing, a first-stage exhaust bearing and a first-stage rotor, the first-stage rotor is arranged in the first-stage compression cavity, and an oil collecting tank of a middle cavity is arranged on the external oil circuit; the first-stage exhaust bearing is arranged in the first-stage exhaust bearing cavity, and the first-stage rotor is arranged in the first-stage compression cavity;
the oil output ends of the cavity where the first-stage air suction bearing is located and the cavity of the first-stage exhaust bearing are connected to the first-stage compression cavity, the oil gas output end of the first-stage compression cavity is connected to the middle cavity, the oil output end of the middle cavity is connected to the oil collecting tank of the middle cavity, and the oil output end of the oil collecting tank of the middle cavity is connected to the oil separator.
Preferably, the oil-gas output end of the intermediate cavity is connected to a secondary compression cavity, and the oil-gas output end of the secondary compression cavity is connected to the oil separator.
Preferably, the first part of the device comprises a secondary suction bearing and a secondary exhaust bearing; an oil pump is arranged between the middle cavity oil collecting tank and the oil separator.
Preferably, the first-stage compression cavity is communicated with the first oil path through a third oil path, and the intermediate cavity is communicated with the first oil path through a fourth oil path.
In the method for reducing the oil stirring loss of the oil return device of the two-stage screw air compressor, lubricating oil is divided into a first oil path and a second oil path which are connected in parallel from the output end of an oil filter, and after part of the oil in the first oil path lubricates the second part of the oil, the lubricating oil flows into an oil separator through an external oil path; and after lubricating the first part of the devices, the oil in the first oil path flows into the secondary compression cavity, and after lubricating the secondary rotor, the oil in the second oil path and the lubricating oil in the secondary compression cavity flow into the oil separator.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a two-stage screw air compressor oil return device for reducing oil stirring loss, which changes the method that high-temperature oil which flows through a gear and a bearing and high-temperature oil which is cooled in a first-stage compression cavity and a middle cavity are all sent into a second-stage compression cavity, the oil of the part is directly sent to an oil separator after second-stage exhaust, the oil return through the second-stage compression cavity is realized through an external pipeline and an oil pump originally, and the oil stirring loss of the second-stage compression cavity is reduced.
Furthermore, for the two-stage screw air compressor, lubricating oil in the device directly enters the oil pump through the gear box after lubricating the bearing and the gear, and enters the oil separator through the oil pump, and the lubricating oil does not pass through the two-stage compression cavity any more, so that the oil stirring loss of the two-stage compression cavity is reduced.
Furthermore, for the two-stage screw air compressor, after the lubricating oil of the device lubricates the bearing, the oil-gas separation process is carried out in the middle cavity, the separated lubricating oil flows into the oil collecting tank of the middle cavity, and then the lubricating oil in the oil collecting tank of the middle cavity is sent into the oil separator through the oil pump, so that the lubricating oil of the first-stage air suction bearing, the first-stage exhaust bearing, the first-stage compression cavity and the middle cavity does not completely enter the second-stage compression cavity any more, and excessive lubricating oil is prevented from entering the second-stage compression cavity.
The invention also discloses a two-stage screw air compressor oil return method for reducing oil stirring loss, which directly sends the high-temperature oil which flows through the gear and the bearing and the high-temperature oil which is cooled in the first-stage compression cavity and the middle cavity to the oil separator after the second-stage air exhaust, and the oil return through the second-stage compression cavity is realized through an external pipeline and an oil pump, so that the oil stirring loss of a rotor in the second-stage compression cavity is reduced, and the energy efficiency of the compressor is effectively improved.
Drawings
Fig. 1 is a schematic view of an oil return system of a novel two-stage screw air compressor according to an embodiment of the present invention. .
Fig. 2 is a sectional view of a two-stage screw air compressor according to an embodiment of the present invention.
In the figure: 1-a first-stage compression cavity, 2-a first-stage rotor, 3-an oil tank, 4-an intermediate cavity, 5-a second-stage compression cavity, 6-a second-stage rotor, 7-a gear box, 8-a second-stage exhaust outlet flow passage, 9 a-a first-stage gear, 9 b-a motor gear, 9 c-a second-stage gear, 10 a-a first-stage air suction bearing, 10 b-a first-stage exhaust bearing, 10 c-a second-stage air suction bearing, 10 d-a second-stage exhaust bearing, 11-a shell, 12-a driving shaft, 20-an oil return port, 21-a first oil path, 22-a second oil path, 23-a third oil path and 25-a fifth oil path; .
Fig. 3 is a schematic view of an oil return system of the novel two-stage screw air compressor according to the second embodiment of the present invention.
Fig. 4 is a sectional view of a two-stage screw air compressor according to a second embodiment of the present invention.
In the figure: 1-a first-stage compression cavity, 2-a first-stage rotor, 3-an oil tank, 4-an intermediate cavity, 5-a second-stage compression cavity, 6-a second-stage rotor, 10 a-a first-stage air suction bearing, 10 b-a first-stage air exhaust bearing, 10 c-a second-stage air suction bearing, 10 d-a second-stage air exhaust bearing, 11-a shell, 13-an intermediate cavity oil collecting tank, 14-a first-stage air exhaust outlet flow channel, 15 a-a first-stage driving mechanism and 15 b-a second-stage driving mechanism; 16-a first-stage driving mechanism cavity, 17-a second-stage driving mechanism cavity, 18-a first-stage exhaust bearing cavity, 19-a second-stage exhaust bearing cavity, 21-a first oil way, 22-a second oil way, 23-a third oil way, 24-a fourth oil way and 25-a fifth oil way; .
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those of ordinary skill in the art.
The invention discloses a two-stage screw air compressor oil return device for reducing oil stirring loss.
Example one
Referring to fig. 1 and 2, the oil return system of the embodiment mainly includes a two-stage screw air compressor, an oil pump, an oil cooler, an oil filter, and an oil separator. As shown in fig. 2, the two-stage screw air compressor mainly comprises: the compressor comprises a primary compression cavity 1, a primary rotor 2, a secondary compression cavity 5, a secondary rotor 6, an intermediate cavity 4, a rotor bearing, a gear box 7 and an oil tank 3.
Referring to fig. 1, the input end of the oil pump is connected with the oil output end of the gear box, the output end of the oil pump is connected with the oil separator, the output end of the oil separator is connected with the oil cooler, the output end of the oil cooler is connected with the oil filter, and the oil outlet pipeline of the oil filter is divided into four ways to enter the screw air compressor.
Referring to fig. 2, the two-stage screw air compressor includes a casing, four cavities isolated from each other are provided in the casing 11, a first-stage compression cavity 1, an intermediate cavity 4 and a second-stage compression cavity 5 are provided in sequence from the upper end to the lower end, a gear box 7 is provided at the front end of the three cavities, and the four cavities are isolated from each other. An oil tank 3 is arranged behind the middle cavity 4. The power input end in this embodiment is set as the front end, and the power output end is set as the rear end, and the following description of this embodiment is based on this and will not be repeated.
The front end of the shell 11 is provided with a driving shaft 12, the rear end of the driving shaft 12 is inserted into the gear box 7, a primary gear 9a, a motor gear 9b and a secondary gear 9c are sequentially arranged in the gear box 7 from one end to the other end, and the motor gear 9b is simultaneously meshed with the primary gear 9a and the secondary gear 9 c. The rear end of the driving shaft 12 is fixedly connected with the middle of the motor gear 9b, so that the driving shaft 12 can drive the primary gear 9a and the secondary gear 9c to rotate when rotating. Therefore, the motor gear 9b is a driving gear, and the primary gear 9a and the secondary gear 9c are driven gears.
The major structure setting of one-level rotor 2 is in one-level compression chamber 1, the front end of one-level rotor 2 inserts to gearbox 7, the front end of one-level rotor 2 and the center fixed connection of one-level gear 9a, make one-level gear 9a can drive one-level rotor 2 when rotating and rotate, the front end of one-level rotor 2 is put up the front end of dress at one-level compression chamber 1 through one-level air suction bearing 10a, the rear end of one-level rotor 2 is put up the rear end of dress at one-level compression chamber 2 through one-level air discharge bearing 10b, one-level air suction bearing 10a and one-level air discharge bearing 10 b's combined action, make one-level rotor 2 rotate for casing 11.
The major structure setting of second grade rotor 6 is in second grade compression chamber 5, the front end of second grade rotor 6 inserts to gearbox 7 in, the front end of second grade rotor 6 and the central fixed connection of second grade gear 9c, make second grade gear 9c can drive second grade rotor 6 when rotating and rotate, the front end of second grade rotor 6 puts up the front end at second grade compression chamber 5 through second grade air suction bearing 10c, the rear end of second grade rotor 6 puts up the rear end at second grade compression chamber 5 through second grade air discharge bearing 10d, second grade air suction bearing 10c and second grade air discharge bearing 10 d's combined action, make second grade rotor 6 rotate for casing 11.
The oil supply of the four bearings directly comes from a main oil supply port behind the oil filter and then enters the gear box through an internal oil return circuit.
Specifically, the bottom of the gear box 7 is provided with an oil return port.
The oil from the oil filter is divided into two paths, a first oil path 21 and a second oil path 22, wherein the first oil path 21 is divided into a third oil path 23 and a fifth oil path 25.
The fifth oil path 25 is divided into a first branch and a second branch, the first branch is divided into four paths, the four paths respectively enter a cavity where the first-stage air suction bearing 10a, the first-stage air exhaust bearing 10b, the second-stage air suction bearing 10c and the second-stage air exhaust bearing 10d are located to lubricate the four bearings, and the second branch enters the gear box 7 to respectively lubricate the first-stage gear 9a, the motor gear 9b and the second-stage gear 9 c; an oil return port 20 is arranged at the bottom of the gear box 7, oil lubricated by the four bearings of the first branch is uniformly input into the gear box 7 and is in the gear box 7 together with lubricating oil lubricated by the three gears, an oil outlet 20 is arranged at the bottom of the gear box 7, and an oil pump directly pumps oil from the gear box 7 to the oil separator from the oil outlet 20.
The third oil path 23 is connected to the first-stage compression chamber 1, so that oil in the third oil path 23 enters the first-stage compression chamber 1 to lubricate the first-stage rotor 2 and then enters the middle chamber 4, and oil in the first-stage compression chamber 1 enters the middle chamber 4 along with first-stage exhaust and then enters the second-stage compression chamber 5.
The second oil path 22 is directly connected to the intermediate cavity 4, the oil outlet end of the intermediate cavity 4 is connected to the secondary compression cavity 5, the oil in the second oil path 22 and the oil which lubricates the primary rotor 2 are converged in the intermediate cavity 4 and then are jointly input into the secondary compression cavity 5 to lubricate the secondary rotor 6, and the lubricating oil in the secondary compression cavity 5 flows out of the secondary exhaust outlet flow passage 8 along with the high-pressure gas and then enters the oil separator.
The oil in the oil separator is divided into three paths after passing through the oil cooler and the oil filter in sequence, and lubrication is performed according to the process.
The novel screw air compressor oil circuit disclosed by the invention is as shown in figure 1, oil at a bearing and a gear is directly sent to an oil separator behind a secondary exhaust port without passing through a secondary compression cavity, and thus the oil stirring loss of a screw rotor in the secondary compression cavity is reduced. As shown in fig. 1, the oil at the bottom of the gear box 7 is connected to the oil separator through an external oil path, and the pressure difference is overcome by connecting an oil pump in the middle.
Example two
Referring to fig. 3 and 4, the invention discloses an oil return system of a two-stage screw air compressor, which mainly comprises the two-stage screw air compressor, an oil pump, an oil cooler, an oil filter and an oil separator. As shown in fig. 3 and 4, the two-stage screw air compressor mainly includes: the compressor comprises a primary compression cavity 1, a primary rotor 2, a secondary compression cavity 5, a secondary rotor 6, an intermediate cavity 4 and a bearing.
Referring to fig. 4, five cavities are provided in the housing, and the power input end is set as the front end and the power output end is set as the rear end, which are used as standards in the following description and are not repeated.
The front ends of the compression cavity 1 and the compression cavity 5 are provided with two cavities which are isolated from each other, namely a first-stage driving mechanism cavity 16 and a second-stage driving mechanism cavity 17, the rear part of the first-stage driving mechanism cavity 16 is provided with a first-stage compression cavity 1, and the rear part of the first-stage compression cavity 1 is provided with a first-stage exhaust bearing cavity 18. A secondary compression cavity 5 is arranged behind the secondary driving mechanism cavity 17, and a secondary exhaust bearing cavity 19 is arranged behind the secondary compression cavity 5. The cavity between one-level compression chamber 1 and the second grade compression chamber 5 is middle chamber 4, and middle chamber 4 is arranged in between one-level compression chamber 1 and the second grade compression chamber 5, plays the effect of two cavitys of intercommunication, and the exhaust air current of one-level compression chamber 1 gets into second grade compression chamber 5 through middle chamber 4, and the place ahead of middle chamber 4 is provided with one-level exhaust outlet runner 14. The end of the middle cavity 4 is provided with a middle cavity oil collecting groove 13.
The first-stage driving mechanism cavity 16 is internally provided with a first-stage driving mechanism 15a, the first-stage compression cavity 1 is internally provided with a first-stage rotor 2, and the first-stage exhaust bearing cavity 18 is internally provided with a first-stage exhaust bearing 10 b. The front end of one-level rotor 2 passes one-level air suction bearing 10a simultaneously and stretches into one-level actuating mechanism cavity 16, the front end and the one-level actuating mechanism 15a fixed connection of one-level rotor 2, the rear end of one-level rotor 2 stretches into one-level exhaust bearing cavity 18, the rear end and the one-level exhaust bearing 10b of one-level rotor 2 are connected, one-level air suction bearing 10a erects on casing 11, one-level rotor 2 rotates under the drive of one-level actuating mechanism 15a, make one-level rotor 2 rotate for casing 11 through one-level air suction bearing 10a and one-level exhaust bearing 10 b.
And a secondary driving mechanism 15b is arranged in the secondary driving mechanism cavity 17, a secondary rotor 6 is arranged in the secondary compression cavity 5, and a secondary exhaust bearing 10d is arranged in the secondary exhaust bearing cavity 19. The front end of the secondary rotor 6 penetrates through the secondary air suction bearing 10c to extend into the secondary driving mechanism cavity 17, the front end of the secondary rotor 6 is fixedly connected with the secondary driving mechanism 15b, the rear end of the secondary rotor 6 extends into the secondary exhaust bearing cavity 19, the rear end of the secondary rotor 6 is connected with the secondary exhaust bearing 10d, the secondary air suction bearing 10c is erected on the shell 11, the secondary rotor 6 is driven by the secondary driving mechanism 15b to rotate, and the secondary rotor 2 can rotate relative to the shell 11 through the secondary air suction bearing 10c and the secondary exhaust bearing 10 d.
The oil at the bearings comes from an oil outlet of the oil filter and then returns to the corresponding compression cavities of each stage through oil return paths respectively.
Referring to fig. 3, in particular, the oil from the oil filter can be divided into four paths to the compressor to achieve different functions. The output end of the oil filter is divided into two parts, namely a first oil path 21 and a second oil path 22, and the first oil path 21 is divided into a third oil path 23, a fourth oil path 24 and a fifth oil path 25; the fifth oil path 25 is divided into two branches, namely a third branch and a fourth branch, wherein the third branch is connected to the cavity where the first-stage suction bearing 10a is located and the first-stage exhaust bearing cavity 18 and is used for lubricating the first-stage suction bearing 10a and the first-stage exhaust bearing 10 b; the fourth branch is connected to the cavity where the secondary suction bearing 10c is located and the secondary exhaust bearing cavity 19 for lubrication of the secondary suction bearing 10c and the secondary exhaust bearing 10 d. The oil lubricated by the first-stage air suction bearing 10a and the first-stage air discharge bearing 10b returns to the first-stage compression cavity 1 after being lubricated, and the oil lubricated by the second-stage air suction bearing 10c and the second-stage air discharge bearing 10d returns to the second-stage compression cavity 5 after being lubricated.
The second oil path 22 is connected with the second-stage compression cavity 5, so that lubricating oil in the second oil path 22 is directly sprayed into the second-stage compression cavity 5 to lubricate, seal and cool the second-stage compression cavity 5.
The third oil path 23 is connected with the first-stage compression cavity 1, so that lubricating oil in the third oil path 23 is directly sprayed into the first-stage compression cavity 1 to lubricate, seal and cool the first-stage compression cavity 1. The lubricating oil in the first-stage compression chamber 1 flows into the intermediate chamber 4 through the first-stage discharge outlet flow passage 14 with the first-stage discharge gas.
The fourth oil passage 24 is connected to the intermediate chamber 4 so that lubricating oil from the oil filter is sprayed into the intermediate chamber 4 through the oil tank 3 for cooling the discharge gas of the first-stage compression chamber, thereby achieving interstage cooling. The bottom of the outlet at the tail end of the middle cavity 4 is provided with a middle cavity oil collecting groove 13, so that the lubricating oil carried by the oil-gas mixture discharged from the first-stage compression cavity 1 and sprayed into the middle cavity 4 from the third branch and the third oil path and the lubricating oil sprayed into the middle cavity 4 from the fourth oil path are separated by the middle cavity 4 and then collected in the middle cavity oil collecting groove 13. The intermediate space 4 here serves for oil separation, the separated oil flowing into the intermediate space sump 14.
All the lubricating oil entering the secondary compression cavity 5 enters an oil separator along with the oil-gas mixture discharged from the secondary compression cavity to complete circulation.
The lubricating oil in the oil collecting tank 13 of the middle cavity overcomes the pressure difference through the oil pump and enters the oil separator, the lubricating oil in the oil separator completes circulation through the oil cooler and the oil filter, and the oil output by the oil filter is divided into four paths to complete the process.
The oil circuit system of the novel two-stage screw air compressor is shown in fig. 3, and an oil separation process in the middle cavity is added on the basis of the original oil circuit system. The bottom of the middle cavity is provided with a middle cavity oil collecting groove 13, oil-gas separation of oil-gas mixture in the middle cavity is realized in the flowing process, and oil is collected in the middle cavity oil collecting groove 13 under the action of gravity. Particularly, the oil accumulated in the oil collecting tank 13 of the middle cavity is directly sent into the oil separator through the oil pump to complete circulation, so that excessive high-temperature lubricating oil is prevented from entering the secondary compression cavity 5, the oil stirring loss and the heat loss of rotors in the secondary compression cavity are reduced, and the power consumption of the compressor is reduced. In particular, the oil-gas separation process of the oil-gas mixture in the middle cavity can be realized by arranging any type of oil-gas separation device, and can also be directly realized by simple collision separation.
When the separation efficiency of the middle cavity oil-gas separation device is high, almost all oil is separated, only a small amount of oil enters the second stage, and the second stage oil injection is needed at the moment. If the separation efficiency of the middle cavity oil-gas separation device is low, secondary oil injection is not needed. Thus, the oil in the secondary compression cavity is always kept at a reasonable lower level.
In conclusion, the oil for lubricating the bearing and the gear, the oil for cooling the primary compression cavity and the oil for cooling the intermediate cavity are directly connected to the oil separator, so that excessive lubricating oil is prevented from entering the secondary compression cavity, the oil quantity in the secondary compression cavity can be reduced, and the oil stirring loss of the secondary rotor is reduced. In addition, the problem that the hole diameter of an internal oil return oil way is too small and oil return is blocked can be avoided by supplying oil through an external oil way, and the influence on the structural strength of the compressor due to the fact that the internal oil hole is formed is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A two-stage screw air compressor oil return device capable of reducing oil stirring loss is characterized by comprising an oil separator, wherein the oil separator is connected with an oil cooler, the oil cooler is connected with an oil filter, and the output end of the oil filter is divided into two oil paths which are a first oil path (21) and a second oil path (22) respectively;
the second oil path (22) is connected to the secondary compression cavity (5), the first oil path (21) is connected to a cavity where other devices are located, and the other devices comprise a first part device and a second part device;
the oil output end of the cavity where the first part device is located is communicated with the secondary compression cavity (5), the oil output end or the oil-gas output end of the secondary compression cavity (5) is connected to the oil separator, and the oil output end of the cavity where the second part device is located is connected to the oil separator through an external oil way.
2. The oil return device of the two-stage screw air compressor capable of reducing the oil stirring loss as claimed in claim 1, wherein the second part device comprises a bearing and a gear, and a gear box (7) is arranged on the external oil circuit; the oil output end of the cavity where the bearing is located and the oil output end of the cavity where the gear is located are both communicated with a gear box (7), and the gear box (7) is connected to the oil separator.
3. A two-stage screw air compressor oil return device for reducing the oil churning loss according to claim 2, characterized in that an oil pump is arranged between the gear box (7) and the oil separator.
4. The oil return device of the two-stage screw air compressor capable of reducing the oil stirring loss according to claim 2, wherein the first part device is a one-stage rotor (2), the one-stage rotor (2) is installed in a one-stage compression cavity (1), an oil output end of the one-stage compression cavity (1) is connected to the middle cavity (4), and an oil output end of the middle cavity (4) is connected to the two-stage compression cavity (5).
5. The oil return device of the two-stage screw air compressor capable of reducing the oil stirring loss according to claim 4, wherein the one-stage compression cavity (1) is communicated with the first oil passage (21) through a third oil passage (23), and the intermediate cavity (4) is arranged on the second oil passage (22).
6. The oil return device of the two-stage screw air compressor capable of reducing the oil stirring loss according to claim 1, wherein the second part of the device comprises a first-stage suction bearing (10a), a first-stage exhaust bearing (10b) and a first-stage rotor (2), the first-stage rotor (2) is installed in a first-stage compression cavity (1), and an intermediate cavity oil collecting tank (13) is arranged on the external oil path; the first-stage exhaust bearing (10b) is arranged in the first-stage exhaust bearing cavity (18), and the first-stage rotor (2) is arranged in the first-stage compression cavity (1);
the oil output end of the cavity where the first-stage air suction bearing (10a) is located and the oil output end of the first-stage exhaust bearing cavity (18) are both connected to the first-stage compression cavity (1), the oil gas output end of the first-stage compression cavity (1) is connected to the middle cavity (4), the oil output end of the middle cavity (4) is connected to the middle cavity oil collecting tank (13), and the oil output end of the middle cavity oil collecting tank (13) is connected to the oil separator.
7. The oil return device of the two-stage screw air compressor capable of reducing the oil stirring loss as claimed in claim 6, wherein the oil-gas output end of the intermediate cavity (4) is connected to the two-stage compression cavity (5), and the oil-gas output end of the two-stage compression cavity (5) is connected to an oil separator.
8. A two-stage screw air compressor oil return device for reducing churning losses as claimed in claim 6 wherein said first part means includes a secondary suction bearing (10c) and a secondary exhaust bearing (10 d); an oil pump is arranged between the middle cavity oil collecting tank (13) and the oil separator.
9. The oil return device of the two-stage screw air compressor capable of reducing the oil stirring loss according to claim 6, wherein the one-stage compression cavity (1) is communicated with the first oil passage (21) through a third oil passage (23), and the intermediate cavity (4) is communicated with the first oil passage (21) through a fourth oil passage (24).
10. A method for reducing the oil stirring loss of the oil return device of the two-stage screw air compressor based on any one of the claims 1-9, which is characterized in that lubricating oil is divided into a first oil path (21) and a second oil path (22) which are connected in parallel from the output end of an oil filter, and after part of the oil in the first oil path (21) lubricates the second part of the oil, the lubricating oil flows into an oil separator through an external oil path; and after lubricating the first part of the first oil path (21), the first part of the first oil path flows into the secondary compression cavity (5), and after lubricating the secondary rotor (6), the oil in the second oil path (22) flows into the oil separator together with the lubricating oil in the secondary compression cavity (5).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114738279A (en) * | 2022-03-26 | 2022-07-12 | 上海坤彧节能科技有限公司 | Double-stage compression main machine with interstage cooling device |
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Inventor after: Wang Chuang Inventor after: Xing Ziwen Inventor after: Yuan Hengchuan Inventor after: Liao Xinzhong Inventor before: Yuan Hengchuan Inventor before: Liao Xinzhong Inventor before: Wang Chuang Inventor before: Xing Ziwen |