Compressor, oil mist treatment device and its oil cooling circulation system

Abstract

The present invention belongs to the technical field of compressors, and particularly relates to a compressor, an oil mist treatment device and an oil cooling circulation system thereof. It solves the defects such as unreasonable design in the prior art. This compressor includes a docking member with a turbulent flow area on the inner top side. An oil receiving tray extending radially outward of the docking member is provided on the outer top of the docking member. An outer cover with mesh holes on at least part of its side wall is provided on the oil receiving tray. A mesh cover that divides the inner space of the outer cover into an inner separation cavity and an outer separation cavity is provided on the top of the docking member or inside the outer cover. A first filter screen is provided in the inner separation cavity, and a second filter screen is provided in the outer separation cavity. The oil receiving tray and the docking member are connected through a reflux bypass pipe, and at least part of an air inducer extends into the outer separation cavity. Advantages of this application: The phenomenon of incomplete oil mist separation is completely solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and particularly relates to a compressor, an oil mist treatment device and an oil cooling circulation system thereof. Background Art

[0002] As a work device for a medium, a compressor can increase the pressure of the medium.

[0003] The pressure increase adopts a plurality of work units connected in series. The work unit is, for example, a volute impeller, and the driving of multiple impellers is driven by mechanical power. When operating at high speed, it is necessary to cool the lubricating oil for the mechanical power drive. Since the lubricating oil in the oil pressure station connected to the mechanical power is heated, there will be oil mist. Conventional oil mist treatment is not thorough. For example, CN201921878651.5 discloses an oil-gas separator for a medium-pressure compressor, including a cylinder body, a lining cylinder, an oil mist fine separator and a lubricating oil filter. The oil mist fine separator is arranged in the lining cylinder, and the lubricating oil filter is arranged in the cylinder body. During operation, the oil-containing compressed air enters the cylinder body tangentially along the inner wall of the cylinder body from the air inlet, and rotates in the annular channel between the cylinder body and the lining cylinder. The oil-containing compressed air rotates to separate oil and air under the action of centrifugal force. The compressed air after centrifugal separation enters the inner cavity of the lining cylinder from the bottom of the lining cylinder. The oil mist fine separator is arranged in the lining cylinder. After further separation by the oil mist fine separator, the compressed air is discharged from the exhaust port; the lubricating oil after centrifugal separation flows down along the inner wall of the cylinder body to the bottom of the cylinder body. The separated lubricating oil is filtered by the lubricating oil filter and then discharged from the oil drain interface. The oil mist fine separator and the lubricating oil filter are installed in the cylinder body to balance their pressures and avoid the problem that the oil mist fine separator and the lubricating oil filter bear a large pressure difference.

[0004] Although the above solution has the above technical advantages, however, the above solution does not completely solve the technical problem of incomplete oil mist separation. Summary of the Invention

[0005] An object of the present invention is to provide a compressor, an oil mist treatment device and an oil cooling circulation system thereof that can solve the above technical problems in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The oil mist treatment device of this compressor includes a docking part with a turbulent flow area on the inner top side. An oil receiving tray extending radially outward of the docking part is provided on the outer top of the docking part. An outer cover with meshes on at least part of its side wall is provided on the oil receiving tray. A mesh cover that divides the inner space of the outer cover into an inner separation cavity and an outer separation cavity is provided on the top of the docking part or inside the outer cover. A first filter screen is provided in the inner separation cavity, and a second filter screen with a reserved space at the top and the inner top of the outer cover is provided in the outer separation cavity. The oil receiving tray and the docking part are connected through a reflux bypass pipe, and at least part of an air inducer extends into the outer separation cavity.

[0008] In the above-mentioned oil mist treatment device of the compressor, the interior of the docking part at least has a conical cavity with a gradually increasing inner diameter from bottom to top, and an annular baffle extending radially inward of the docking part is provided at the top of the conical cavity. The conical cavity and the annular baffle form the turbulent flow area.

[0009] In the above-mentioned oil mist treatment device of the compressor, an acute angle is formed between the annular baffle and the cavity wall of the conical cavity.

[0010] In the above-mentioned oil mist treatment device of the compressor, the mesh cover is a honeycomb hole mesh cover.

[0011] In the above-mentioned oil mist treatment device of the compressor, the mesh cover includes a vertical annular mesh cylinder fixed to the top of the docking part, and a depression part with a downward depression in the center connected to the top of the vertical annular mesh cylinder. The air inducer is an air induction pipe, and at least part of the air induction pipe extends into the depression part.

[0012] In the above-mentioned oil mist treatment device of the compressor, the depressed sub-part of the depression part is located above the side of the annular baffle, and an annular communication space communicating with the inner bottom side of the inner separation cavity is formed between the annular baffle and the depressed sub-part.

[0013] In the above-mentioned oil mist treatment device of the compressor, the lower end of the first filter screen is connected to the inner edge of the annular baffle, the upper end of the first filter screen is connected to the inner top of the depression part, and the first filter screen and the depressed sub-part are spaced apart, and the first filter screen and the vertical annular mesh cylinder are spaced apart.

[0014] In the above-mentioned oil mist treatment device of the compressor, the gap between the first filter screen and the depressed sub-part is smaller than the interval gap between the first filter screen and the vertical annular mesh cylinder.

[0015] As a second solution, the oil cooling circulation system of this compressor is used to connect the compressed oil pressure station and the speed increasing gearbox. The oil cooling circulation system includes an oil mist treatment device of the compressor connected to the oil pressure station, and the oil cooling circulation system further includes an oil cooler. The oil pressure station is communicated with the oil cooler through two parallel oil outlet pipes, and an oil pump is respectively installed on each of the oil outlet pipes. The diameter of one of the two oil outlet pipes is larger than that of the other oil outlet pipe. The oil cooler is communicated with the speed increasing gearbox through a main oil pipe, and the oil pressure station is communicated with the speed increasing gearbox through a return oil pipe.

[0016] As a third solution, this compressor includes the oil cooling circulation system of the compressor.

[0017] Compared with the existing technology, the advantages of this application are as follows:

[0018] The induced air in the induced air pipe forces the oil mist in the oil pressure station to enter the conical cavity, the inner separation cavity and the outer separation cavity upward in sequence. The oil in the oil mist is separated through the turbulent flow area, the first filter screen and the second filter screen. Most of the separated oil flows back to the oil pressure station downward from the conical cavity, and the remaining small part of the separated oil is collected by the oil receiving tray and then flows back to the conical cavity through the return bypass pipe connecting the outer separation cavity and the conical cavity, realizing the thoroughness of oil mist separation and preventing waste loss of oil.

[0019] The induced air pipe makes a micro-vacuum generated inside the oil mist treatment device. Since the suction can form a vacuum, it will assist the oil return, and the smooth oil return helps the sealing of the equipment oil circuit system.

[0020] The compressor oil station forms a circulating oil supply for the lubricating oil in the speed increasing gearbox through oil cooling to extend the service life of the speed increasing gearbox. Brief Description of the Drawings

[0021] Figure 1 is a schematic top view structure diagram of the compressor provided by the present invention.

[0022] Figure 2 is a schematic cross-sectional structure diagram of the compressor provided by the present invention.

[0023] Figure 3 is a schematic top view structure diagram of the compressor main body provided by the present invention.

[0024] Figure 4 is Figure 2 the enlarged structure diagram at F in

[0025] Figure 5 is the control block diagram provided by the present invention.

[0026] Figure 6 is a schematic structure diagram of the second embodiment provided by the present invention.

[0027] Figure 7 This is a schematic side view structure of the compressor provided by the present invention.

[0028] Figure 8 This is a schematic partial top view structure of the compressor provided by the present invention.

[0029] Figure 9 This is a schematic structure diagram of the oil mist treatment device provided by the present invention.

[0030] Figure 10 This is a schematic partial structure diagram of the oil mist treatment device provided by the present invention.

[0031] In the figure, compressor main body 1, inlet 10, outlet 11, working unit 2, volute 20, impeller 21, first impeller rotating shaft 22, second impeller rotating shaft 23, annular seal 24, positioning step 25, annular shoulder 26, blocking ring 27, minute gap 28, drive mechanism 3, speed increaser 30, drive shaft 31, first gear transmission structure 32, second gear transmission structure 33, seal 4, air pressure regulation system 5, controller 6, oil seal ring 7, sealing lip 70, isobaric cavity K, pressure sensor K1, first working unit 2A, second working unit 2B, third working unit 2C, oil cooling circulation system 8, oil pressure station 80, oil cooler 81, return oil pipe 82, oil outlet pipe 83, oil pump 84, main oil pipe 85, fine filter 86, oil mist treatment device 87, docking part 870, conical cavity 8700, annular baffle 8701, turbulent zone 8702, oil collecting tray 871, outer cover 872, inner separation cavity 8720, outer separation cavity 8721, mesh cover 873, vertical annular mesh cylinder 8730, with recessed part 8731, recessed sub - part 8732, first filter net 874, second filter net 875, air duct 88, partition layer 89, spiral diversion channel 890, upper conical partition part 891, lower annular partition part 892. Detailed implementation manners

[0032] The following are specific embodiments of the invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0033] Embodiment 1

[0034] As Figure 1 shown, an oil cooling circulation system 8 connected to the speed increaser 30 is provided on the compressor main body 1. The oil cooling circulation system is a system of cooling pipes and additionally installed cooling pumps or oil stations.

[0035] As Figures 7 - 9As shown, the oil cooling circulation system 8 includes an oil pressure station 80 and an oil cooler 81. The speed increasing gearbox 30 is connected to the oil pressure station 80 through a return oil pipe 82, so that the oil in the speed increasing gearbox 30 returns to the oil pressure station 80; the oil pressure station 80 is connected to the oil cooler 81 through two parallel oil outlet pipes 83. An oil pump 84 is installed on each oil outlet pipe 83 respectively. The oil cooler 81 is connected to the speed increasing gearbox 30 through a main oil pipe 85, and the cooled oil is added to the speed increasing gearbox 30 through the main oil pipe 85.

[0036] A fine filter 86 is also connected to the main oil pipe 85 to filter the oil entering the speed increasing gearbox 30.

[0037] The diameter of one of the two oil outlet pipes 83 is larger than that of the other oil outlet pipe 83. The two oil outlet pipes 83 are defined as the main oil outlet pipe (the oil outlet pipe 83 with a larger diameter) and the auxiliary oil outlet pipe (the oil outlet pipe 83 with a smaller diameter). When the compressor starts to operate, the lubricating oil supplies oil to the speed increasing gearbox 30 through the auxiliary oil outlet pipe, that is, the oil pump 84 connected to the auxiliary oil outlet pipe sucks in the oil, which is cooled by the oil cooler 81 and then filtered by the fine filter 86 and then sent into the speed increasing gearbox 30. When the oil pressure exceeds the set value, the oil pump 84 on the auxiliary oil outlet pipe stops working, and the lubricating oil is sucked in by the oil pump 84 on the main oil outlet pipe, cooled by the oil cooler 81 and then filtered by the fine filter 86 and then sent into the speed increasing gearbox 30.

[0038] Secondly, an oil mist treatment device 87 is also connected to the oil pressure station 80. Specifically, the oil mist treatment device 87 in this embodiment uses an air extractor for air extraction. For example, an air extraction pipe 88 is used. The lower end of the air extraction pipe 88 is open, and the air extraction pipe 88 plays a role similar to air extraction. A valve is provided on the air extraction pipe 88 to control the amount of extracted air, so that a large amount of oil mist generated during the operation of the oil cooling circulation system 8 enters the oil mist treatment device 87, and at this time, the oil mist treatment device 87 separates and treats the oil mist.

[0039] Specifically, as Figure 9 shown, the oil mist treatment device 87 includes a docking member 870 connected to the oil pressure station 80 through a pipeline. The inside of the docking member 870 at least has a conical cavity 8700 in the shape of a cone. The inner diameter of the conical cavity 8700 gradually increases from bottom to top. And an annular baffle 8701 extending radially inward of the docking member 870 is provided at the top of the conical cavity 8700. The conical cavity 8700 and the annular baffle 8701 form a turbulent flow area 8702, that is, the inner top side of the docking member 870 has a turbulent flow area 8702;

[0040] An acute angle is formed between the annular baffle 8701 and the cavity wall of the conical cavity 8700. The turbulent flow area 8702 can form a turbulent swirl of the oil mist, making the separation and treatment of the oil mist more thorough.

[0041] Secondly, an oil receiving tray 871 extending radially outward of the docking member 870 is provided on the outer top of the docking member 870, and a cover 872 with at least part of its side wall having mesh holes is provided on the oil receiving tray 871; a mesh cover 873 that divides the internal space of the cover 872 into an inner separation cavity 8720 and an outer separation cavity 8721 is provided on the top of the docking member 870 or inside the cover 872. The inner separation cavity 8720 communicates with the conical cavity 8700. A first filter screen 874 is provided in the inner separation cavity 8720, and a second filter screen 875 with its top and the inner top reserved space of the cover 872 is provided in the outer separation cavity 8721. At least part of the lower end of the air duct 88 extends into the outer separation cavity 8721.

[0042] The air draft of the air duct 88 forces the oil mist in the oil pressure station 80 to enter the conical cavity 8700, the inner separation cavity 8720 and the outer separation cavity 8721 upward in sequence, and the oil in the oil mist is separated by the turbulent flow area 8702, the first filter screen 874 and the second filter screen 875. Most of the separated oil flows back downward from the conical cavity 8700 to the oil pressure station 80, and the remaining separated oil is collected by the oil receiving tray 871 and then flows back to the conical cavity 8700 through the return bypass pipe 876 connecting the outer separation cavity 8721 and the conical cavity 8700.

[0043] Preferably, the mesh cover 873 is a honeycomb hole mesh cover, and the mesh cover 873 specifically includes a vertical annular mesh cylinder 8730 fixed to the top of the docking member 870, and a depression part 8731 connected to the top of the vertical annular mesh cylinder 8730 and having a downward depression in the center. At least part of the lower end of the air duct 88 extends into the depression area.

[0044] The depression sub - part 8732 of the depression part 8731 is located above the side of the annular baffle 8701, and the annular baffle 8701 and the depression sub - part 8732 form an annular communication space communicating with the bottom side of the inner separation cavity 8720. That is, the shape of the inner separation cavity 8720 is approximately "concave", and the shape of the outer separation cavity 8721 is approximately an inverted "concave".

[0045] The lower end of the first filter screen 874 is connected to the inner edge of the annular baffle 8701, the upper end of the first filter screen 874 is connected to the inner top of the part with a recess 8731, and the first filter screen 874 and the recessed sub - part 8732 are spaced apart, and the first filter screen 874 and the erected annular mesh cylinder 8730 are spaced apart. At the same time, the gap between the first filter screen 874 and the recessed sub - part 8732 is smaller than the spacing gap between the first filter screen 874 and the erected annular mesh cylinder 8730. The recessed sub - part 8732 includes a cylindrical part and a bottom connected to the lower end of the cylindrical part, and the recessed sub - part 8732 has a non - porous structure. The distance between the bottom of the part with a recess 8731 and the oil - receiving tray 871 is smaller than the distance between the bottom of the part with a recess 8731 and the inner top of the outer cover 872. Through this design of the distance difference, the lower end of the air - guiding pipe 88 can extend deeper into the outer cover 872 to provide better air - guiding performance.

[0046] The recessed sub - part 8732 forces the oil mist to flow radially therein and enter the inner separation cavity 8720, while at this time the first filter screen 874 separates the oil mist. During this process, the oil mist in the turbulent flow area 8702 is forced to flow upward into the inner separation cavity 8720, and the oil mist flowing radially in the recessed sub - part 8732 and the oil mist flowing upward from the turbulent flow area 8702 form a "cross" flow state. During this process, the oil mist in different directions is mixed, so that the oil mist before entering the first filter screen 874 is already in a uniformly mixed state, so that most of the oil in the oil mist can be separated under the filtration of the first filter screen 874 to the greatest extent, and then it flows back downward from the conical cavity 8700 to the oil pressure station 80 again.

[0047] The filtration accuracy of the first filter screen 874 is higher than that of the second filter screen 875. For example, the first filter screen 874 is a fine filter screen and the second filter screen 875 is a coarse filter screen. And the mesh number of the filter screen can be set by itself.

[0048] Both the first filter screen 874 and the second filter screen 875 are annular meshes, and the axial length of the first filter screen 874 is shorter than that of the second filter screen 875. However, there is a gap between the top of the second filter screen 875 and the inner top of the outer cover 872.

[0049] Finally, the inner diameter of the first filter screen 874 is equal to or greater than the inner diameter of the annular baffle 8701 to prevent the oil mist from directly entering the first filter screen 874 in the wall - thickness direction of the first filter screen 874.

[0050] The working principle of this embodiment is as follows:

[0051] The air - guiding pipe 88 is connected to an axial - flow fan etc., which plays a role in air extraction, so that the oil mist in the oil pressure station 80 enters the oil - mist treatment device 87;

[0052] The oil mist treatment device 87 performs multi-stage separation treatment on the oil mist so that the separated oil flows back from the oil mist treatment device 87 to the oil pressure station 80.

[0053] As a preferred solution, as Figure 10 shown, a partition layer 89 covering the connection between the conical cavity 8700 and the return bypass pipe 876 is provided in the middle and lower part of the conical cavity 8700, and a spiral diversion channel 890 is formed between the partition layer 89 and the inner wall of the conical cavity 8700. In this way, an isolation can be formed between the recovered oil and the oil mist entering the oil mist treatment device in this embodiment, so as to prevent the upward heat-carrying oil mist and the recovered oil from directly forming a heat exchange, resulting in part of the recovered oil re-entering the oil mist treatment device in this embodiment again.

[0054] And the partition layer 89 is made of aluminum material. The spiral diversion channel 890 in this embodiment combined with the partition layer 89 made of aluminum material can form an indirect heat exchange between the recovered oil and the oil mist, so as to reduce the temperature of the oil mist, so that part of the oil mist can be cooled and retained on the partition layer 89, and then directly flow back, which can invisibly improve the oil mist treatment efficiency.

[0055] Specifically, the partition layer 89 of this embodiment includes an upper conical partition layer 891 and a lower annular partition layer 892 connected to the lower end of the upper conical partition layer 891. The upper conical partition layer 891 can play the role of diversion and pressure expansion. The lower annular partition layer 892 is welded to the flange at the lower end of the docking member 870.

[0056] In this embodiment, it is composed of an air guide pipe, multiple filters, an outer cover, etc. By means of the air guide pipe, a micro-vacuum is generated inside the oil mist treatment device. For example, the oil mist in the fuel tank is filtered through the filter. Most of the oil flows back to the fuel tank after filtration, and part of the overflowing oil mist continues to be filtered through the coarse filter and flows back to the fuel tank through the return pipe. The design of multiple filters effectively ensures that the oil mist does not overflow, and because suction can form a vacuum, it will assist in the return of oil. The smooth return of oil helps to seal the oil circuit system of the equipment, so it can bring multiple benefits.

[0057] Secondly, a number of inner convex pieces are provided on the inner surface of the partition layer 89, which are distributed in a circular pattern and arranged in the vertical direction. A long groove is formed between adjacent two inner convex pieces for heat exchange and diversion of the oil mist.

[0058] Embodiment Two

[0059] Based on Embodiment One, as Figures 1 - 3As shown in the figure, the compressor includes a compressor main body 1 and also includes the oil cooling circulation system of the compressor in the first embodiment. The compressor has an inlet 10 and an outlet 11. Vinyl chloride that needs to do work enters from the inlet 10, and the vinyl chloride after doing work is discharged from the outlet 11. A number of working units 2 with a gas path connected in series are provided on the compressor main body 1. The number of working units 2 is 2 - 4, and all of them are impeller - type rotary working units and are driven to do work by the same driving mechanism 3.

[0060] At the rotary connection of the impeller rotation shaft of each working unit 2 and the compressor main body 1, a seal 4 is provided. And at one end of the seal 4 close to the compressor main body 1 for each working unit 2 and the compressor main body 1, an isobaric cavity K is formed. The seal 4 can be any one of a carbon ring seal and a rubber seal. For example, an inert gas with pressure is injected into the isobaric cavity K, and the air pressure in the isobaric cavity K is equal to the air pressure of the vinyl chloride leaked from the working unit 2. When the working unit 2 is doing work, part of the leaked vinyl chloride and part of the gas in the isobaric cavity K enter the seal 4 from both ends of the seal 4 respectively, and the leaked vinyl chloride and the gas entering the seal 4 form a convection state. The formed convection state can make the leaked vinyl chloride stop leaking in the seal 4. And when the sealing performance of the seal 4 deteriorates, due to the isobaric setting in this embodiment, the leakage of vinyl chloride can still be avoided, which can achieve the purpose of long - term use, avoid the phenomenon of frequent replacement of the seal, ensure the safety of vinyl chloride transportation and work, and at the same time reduce the maintenance cost and maintenance difficulty of the compressor.

[0061] And in this way of the embodiment, the impeller does not need to be manufactured in a closed - type manner, so as to further reduce the manufacturing cost and save the sealing cost at the impeller.

[0062] Secondly, at least part of the cavity of the isobaric cavity K and one end of the seal 4 close to the compressor main body 1 are vertically distributed. Due to the vertical state of at least part of the cavity, at least part of the cavity of the isobaric cavity K at this time can form a cut - off for the leaked vinyl chloride to prevent the leaked vinyl chloride from continuing to leak along the axial direction of the impeller rotation shaft.

[0063] To achieve pressure control, such as Figure 5As shown in the figure, a pressure sensor K1 is provided in the isobaric cavity K. The isobaric cavity K is connected to the air pressure regulating system 5, and the pressure sensor K1 and the air pressure regulating system 5 are respectively connected to the controller 6. The pressure sensor K1 detects the air pressure in the isobaric cavity K. When the leaked vinyl chloride air pressure is higher than the air pressure in the isobaric cavity K, the pressure in the isobaric cavity K will increase at this time. After receiving this signal, the controller 6 starts the air pressure regulating system 5 to input gas equal to the leaked vinyl chloride air pressure into the isobaric cavity K to form an equal equilibrium pressure. A discharge valve is provided for each isobaric cavity K. When vinyl chloride stops entering the compressor, the discharge valve opens at this time, and the gas in the isobaric cavity K and the leaked vinyl chloride gas are discharged and collected from the discharge valve to prevent the gas in the isobaric cavity K from entering the working unit 2.

[0064] In a preferred embodiment, a vinyl chloride detection sensor is provided at one end of the seal 4 close to the impeller, and an inert gas detection sensor is provided at one end of the seal 4 close to the compressor body 1 to detect whether the leaked vinyl chloride gas and the gas in the isobaric cavity K are in an isobaric state. The vinyl chloride detection sensor and the inert gas detection sensor are respectively connected to the controller 6, and in this embodiment, they are connected by wireless communication.

[0065] The air pressure regulating system 5 is, for example, components such as a booster pump, and the controller 6 is, for example, a commercially available PLC controller.

[0066] As a preferred embodiment of this embodiment, as Figure 2 and Figure 4 shown, there are three working units 2 in this embodiment. The gas paths of the three working units 2 are connected in sequence to achieve the purpose of gradually increasing the pressure. Each working unit 2 includes a volute 20 and an impeller 21 located in the volute 20. Two of the impellers 21 are connected to the first impeller rotating shaft 22, and the remaining one impeller 21 is connected to the second impeller rotating shaft 23. The side of the volute 20 and the compressor body 1 are connected by an annular seal 24. A small gap 28 is formed at the outer end of the volute 20 and the annular seal 24. Seals 4 are sleeved on the first impeller rotating shaft 22 and the second impeller rotating shaft 23 respectively. One end of the seal 4 away from the compressor body 1 is fixed to the annular seal 24, and an isobaric cavity K is formed between the annular seal 24 and the side of the compressor body 1. Forming the isobaric cavity K in this way in this embodiment can greatly increase the volume of the isobaric cavity K and solve the technical problem of high production difficulty caused by the small sealing space between the seal and the impeller rotating shaft in the prior art.

[0067] The volume of the isobaric cavity K with different volumes can be formed by adjusting the inner diameter of the annular seal 24. For example, there are three isobaric cavities K in this embodiment. According to the pressurization process of the three working units 2, the volumes of the three isobaric cavities K gradually increase to resist the leaked vinyl chloride air pressure after continuous pressurization.

[0068] Further, a seal 4 on the first impeller rotating shaft 22 is rotationally and sealingly connected to the first impeller rotating shaft 22, for example, sealed by a concave-convex fit (sealing lip) manner; a seal 4 sleeved on the second impeller rotating shaft 23 is rotationally and sealingly connected to the second impeller rotating shaft 23, for example, sealed by a concave-convex fit (sealing lip) manner.

[0069] Further, a positioning step 25 is provided at one end of the annular seal 24 away from the compressor main body 1, and an annular shoulder 26 is provided at one end of the seal 4 away from the compressor main body 1. The annular shoulder 26 is fixed to the positioning step 25, and the two are fixed by bolts. Of course, spring washers and the like can be added to the bolts to prevent the bolts from loosening.

[0070] The first impeller rotating shaft 22 and the second impeller rotating shaft 23 are respectively rotationally connected to the compressor main body 1. Oil sealing rings 7 sleeved on the first impeller rotating shaft 22 and the second impeller rotating shaft 23 are provided on the side surface of the compressor main body 1. The oil sealing rings 7 and the corresponding seals 4 are distributed at intervals. A plurality of rings of blocking rings 27 are respectively provided on the first impeller rotating shaft 22 and the second impeller rotating shaft 23. A plurality of sealing lips 70 are respectively provided on the inner walls of the corresponding oil sealing rings 7. A first annular inclined surface facing inwards is provided on the inner side of some of the sealing lips 70, and a second annular inclined surface facing inwards is provided on the outer side of the remaining sealing lips 70. The first annular inclined surface and the second annular inclined surface form a figure-eight distribution, and some of the sealing lips 70 are located in the axial space formed by two adjacent blocking rings 27.

[0071] And at least one of the blocking rings 27 has a third annular inclined surface, and at least a part of the first annular inclined surface is sealed in conformity with the third annular inclined surface. To solve the problem of outward leakage of the isobaric cavity K from the oil sealing ring 7.

[0072] Embodiment Three

[0073] Based on Embodiment Two, as Figure 2 and Figure 6As shown, specific examples are given in this embodiment. For example, there are three working units 2, which are defined as the first working unit 2A, the second working unit 2B, and the third working unit 2C. The air pressure after the first working unit 2A does work is less than that after the second working unit 2B does work, and the air pressure after the second working unit 2B does work is less than that after the third working unit 2C does work. And the driving mechanism 3 includes a speed increasing box 30 provided on the compressor main body 1. A driving shaft 31 is rotatably connected in the speed increasing box 30. The first impeller rotating shaft 22 and the second impeller rotating shaft 23 are parallel to each other, and the driving shaft 31 is located between the first impeller rotating shaft 22 and the second impeller rotating shaft 23. The driving shaft 31 and the first impeller rotating shaft 22 are connected by a first gear transmission structure 32, and the driving shaft 31 and the second impeller rotating shaft 23 are connected by a second gear transmission structure 33. Both the first gear transmission structure 32 and the second gear transmission structure 33 are two meshing gears. Of course, a common gear can be provided on the driving shaft 31, which can also meet the driving requirements.

[0074] The driving shaft 31 is connected to the motor.

[0075] Pressurization can be achieved by continuously reducing the inner flow passage of the volute 20. It can be seen from the drawings of this embodiment that the inner flow passage of the volute 20 is continuously reduced.

[0076] In addition, at the first working unit 2A, the seal 4 is a labyrinth seal, and at the second and third working units 2B / 2C, the seal 4 is a carbon ring seal to meet the sealing requirements of continuous pressurization and ensure the service life requirements.

[0077] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0078] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An oil mist treatment device for a compressor, characterized in that, The oil mist treatment device includes a docking member (870) with a turbulent flow area (8702) on the inner top side. An oil receiving tray (871) extending radially outward of the docking member (870) is provided on the outer top of the docking member (870). An outer cover (872) with a meshed side wall at least partially is provided on the oil receiving tray (871). A mesh cover (873) that divides the inner space of the outer cover (872) into an inner separation cavity (8720) and an outer separation cavity (8721) is provided on the top of the docking member (870) or inside the outer cover (872). A first filter screen (874) is provided in the inner separation cavity (8720). A second filter screen (875) with a reserved space at the top and the inner top of the outer cover (872) is provided in the outer separation cavity (8721). The oil receiving tray (871) and the docking member (870) are connected through a reflux bypass pipe (876). At least part of the air extractor extends into the outer separation cavity (8721); the mesh cover (873) is a honeycomb hole mesh cover. The mesh cover (873) includes a vertical annular mesh cylinder (8730) fixed to the top of the docking member (870), and a depression part (8731) connected to the top of the vertical annular mesh cylinder (8730) and having a downward depression in the center. The air extractor is an air extraction pipe (88). At least part of the air extraction pipe (88) extends into the depression part (8731); the depression sub - part (8732) of the depression part (8731) is a non - perforated structure; The interior of the docking member (870) at least has a conical cavity (8700) in a conical shape. A partition layer (89) covering the connection part of the conical cavity (8700) and the reflux bypass pipe (876) is provided in the middle and lower part of the conical cavity (8700). A spiral diversion channel (890) is formed between the partition layer (89) and the inner wall of the conical cavity (8700). An annular baffle (8701) extending radially inward of the docking member (870) is provided at the top of the conical cavity (8700); The depression sub - part (8732) of the depression part (8731) is located above the side of the annular baffle (8701), and the annular baffle (8701) and the depression sub - part (8732) form an annular communication space communicating with the inner bottom side of the inner separation cavity (8720); The lower end of the first filter screen (874) is connected to the inner edge of the annular baffle (8701), the upper end of the first filter screen (874) is connected to the inner top of the depression part (8731), and the first filter screen (874) and the depression sub - part (8732) are spaced apart, and the first filter screen (874) and the vertical annular mesh cylinder (8730) are spaced apart.

2. The oil mist treatment device of the compressor according to claim 1, wherein, The inner diameter of the conical cavity (8700) gradually increases from bottom to top, and the conical cavity (8700) and the annular baffle (8701) form the turbulent flow area (8702).

3. The oil mist treatment device of the compressor according to claim 2, characterized in that, An acute angle is formed between the annular baffle (8701) and the cavity wall of the conical cavity (8700).

4. The oil mist treatment device of the compressor according to claim 1, characterized in that The gap between the first filter screen (874) and the recessed sub - portion (8732) is smaller than the spacing gap between the first filter screen (874) and the upright annular mesh cylinder (8730).

5. The oil cooling circulation system of the compressor, which is used to connect the compressed oil pressure station (80) and the speed increasing gearbox (30), is characterized in that, The oil cooling and circulating system includes an oil mist treatment device of the compressor according to any one of claims 1 - 4 connected to the oil pressure station (80), and the oil cooling and circulating system further includes an oil cooler (81). The oil pressure station (80) is communicated with the oil cooler (81) through two parallel oil outlet pipes (83). An oil pump (84) is respectively installed on each of the oil outlet pipes (83). The diameter of one of the two oil outlet pipes (83) is larger than that of the other oil outlet pipe (83). The oil cooler (81) is communicated with the speed increasing gear box (30) through a main oil pipe (85). The oil pressure station (80) is communicated with the speed increasing gear box (30) through an oil return pipe (82).

6. Compressor, characterized in that, The compressor includes the oil cooling and circulating system of the compressor according to claim 5.

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