CN112983826A

CN112983826A - Middle-high pressure screw compressor

Info

Publication number: CN112983826A
Application number: CN202110227053.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-06-18

Abstract

The invention provides a medium-high pressure screw compressor, which comprises a screw rotor, a motor and an oil separation barrel, wherein the oil separation barrel comprises an outer barrel and an inner barrel, the inner barrel is sleeved in the outer barrel: a hollow clearance layer is arranged between the outer cylinder and the inner cylinder; a multi-stage filtering device is arranged in the inner cylinder, a single-stage filtering device is arranged in the gap layer, an inner exhaust port is arranged on the inner cylinder, an outer exhaust port is arranged on the outer cylinder, the inner exhaust port is sleeved in the outer exhaust port, and a hollow annular cavity is formed between the inner exhaust port and the outer exhaust port; oil-gas mixture gets into back in the inner tube, the part gets into filter in the multi-stage filtration device and pass through interior exhaust port discharges, and remaining oil-gas mixture gets into in the clearance layer, warp single-stage filtration device filters the back and passes through the annular chamber is discharged, this application well high-pressure screw compressor have that oil-gas separation is effectual, the exhaust is smooth and easy, and filter equipment occupation space is little advantage.

Description

Middle-high pressure screw compressor

Technical Field

The invention relates to a compressor, in particular to a screw compressor, and particularly relates to a medium-high pressure screw compressor.

Background

In screw compressors, devices or structures for separating oil and gas, such as oil barrels, are provided. The oil-gas separation effect directly affects the performance and the working reliability of the screw compressor, so that the oil content improvement effect is one of the main targets pursued by the design of the screw compressor.

At present, a built-in oil separation barrel of a screw compressor is usually provided with a separation structure of an oil separation filter screen, and the separation structure forms resistance to the flow of an oil-gas mixture by virtue of a compact net-shaped structure, so that the flow velocity of the oil-gas mixture is reduced, and the separation purpose is achieved by adsorption and filtration. Wherein, the effect of oil-gas separation is related to the airflow velocity flowing through the oil filter screen. When the flow velocity is larger, the oil-gas separation efficiency of the oil separation filter screen is lower, and the effect is poorer. Therefore, it is necessary to control the flow rate of the air flow passing through the oil separating screen.

However, after the flow rate of the oil-gas mixture is reduced, the exhaust efficiency of the compressor is reduced, if the gas in the oil-gas barrel is not discharged in time, the working efficiency of the compressor is reduced, and the normal operation of downstream equipment is affected, so that the exhaust efficiency needs to be improved in the exhaust process to ensure the requirements of the downstream equipment, particularly the circulation requirement in a circulation system and the suction power of the compressor is reduced, and the adverse effect is more obvious for medium-high pressure compressors.

In addition, the oil-gas mixture can be filtered for multiple times by arranging a plurality of layers of filter screens so as to improve the separation effect, but the volume of the oil drum of the compressor is increased.

Therefore, on the premise of ensuring the exhaust efficiency and meeting the requirements of downstream equipment, providing a compressor, in particular a medium-high pressure screw compressor, which can effectively improve the oil-gas separation efficiency is one of the technical problems to be solved urgently by the technical staff in the field.

Disclosure of Invention

The invention designs a medium-high pressure screw compressor to achieve the purpose of improving the oil-gas separation efficiency on the premise of ensuring the exhaust efficiency.

In order to solve the problems, the invention discloses a medium-high pressure screw compressor, which comprises a pair of female screw rotors and male screw rotors which are arranged in parallel and can be meshed with each other, a motor for driving the screw rotors to rotate, an oil separation barrel capable of separating oil-gas mixtures and an outer shell arranged on the outer surface of the compressor, wherein the oil separation barrel comprises an outer barrel and an inner barrel, and the inner barrel is sleeved in the outer barrel:

a hollow clearance layer is arranged between the outer cylinder and the inner cylinder; a multi-stage filtering device is arranged in the inner cylinder, a single-stage filtering device is arranged in the gap layer, an inner exhaust port is arranged on the inner cylinder, an outer exhaust port is arranged on the outer cylinder, the inner exhaust port is sleeved in the outer exhaust port, and a hollow annular cavity is formed between the inner exhaust port and the outer exhaust port;

and after the oil-gas mixture compressed by the screw rotor enters the inner cylinder through the air inlet pipeline, part of the oil-gas mixture enters the multistage filtering device for filtering and is discharged through the inner exhaust port, and the rest of the oil-gas mixture enters the clearance layer, is filtered by the single-stage filtering device and is discharged through the annular cavity.

Further, more than 60% of the oil-gas mixture enters the multistage filtering device for filtering and separating, and the rest of the oil-gas mixture enters the single-stage filtering device for filtering and separating.

Furthermore, the multistage filtering device divides the space in the inner cylinder into two parts, the space close to the bottom is a first cavity, the space far away from the bottom is a second cavity, one end of the air inlet pipeline is communicated with the exhaust bearing seat, and the other end of the air inlet pipeline is communicated with the first cavity after penetrating through the multistage filtering device.

Furthermore, the multistage filtering device is provided with an inlet and a first outlet, the inlet is communicated with the first cavity, the oil-gas mixture in the first cavity can enter the multistage filtering device through the inlet, the first outlet is communicated with the second cavity, the second cavity is communicated with the inner exhaust port, and the gas filtered by the multistage filtering device is exhausted through the first outlet.

Further, the admission line includes trunk line, first bypass pipeline and second bypass pipeline, the both ends of first bypass pipeline respectively with trunk line and first cavity are linked together, the both ends of second bypass pipeline respectively with the trunk line with the clearance layer is linked together.

Further, the admission line includes trunk line and shunt, the trunk line one end with the exhaust bearing frame is linked together, the other end of trunk line passes behind the multi-stage filtration device with first cavity is linked together, the shunt includes the diffluence hole, the diffluence hole is for setting up a plurality of through-holes on the inner tube diapire, the diffluence hole is just right the export setting of trunk line.

Further, the shunt still includes the splitter plate, the splitter plate is a plurality of separation blade that are radial distribution, the central axis of splitter plate with the central axis of trunk line is on same straight line.

Further, the multistage filter device comprises a multistage filter screen, a first cover plate, a second cover plate and an outer side plate, the first cover plate, the second cover plate and the outer side plate are matched with each other to form a hollow filter cavity, the multistage filter screen is located in the filter cavity, an inner partition plate is arranged in the multistage filter device, the inner space of the filter cavity is divided into a plurality of sub-filter cavities by the inner partition plate, the multistage filter screen is divided into a plurality of sub-filter screens by the inner partition plate, and the sub-filter screens and the sub-filter cavities are arranged in a one-to-one correspondence mode.

Furthermore, a fluid channel is arranged on an inner partition plate between two adjacent sub-filter cavities, and the oil-gas mixture entering the multistage filter device can sequentially flow through the sub-filter cavities and sequentially pass through the sub-filter screens in the sub-filter cavities through the fluid channel.

Furthermore, the inner partition plate is provided with shearing teeth, the shearing teeth are saw-toothed hollow parts arranged on one side of the inner partition plate, and the fluid channel is formed through the shearing teeth.

The application well high pressure screw compressor have that oil-gas separation is effectual, the exhaust is smooth and easy, and filter equipment occupation space is little advantage.

Drawings

FIG. 1 is a schematic perspective view of an oil drum in the compressor according to the present invention;

FIG. 2 is a schematic view of a portion of the area A in FIG. 1;

FIG. 3 is a schematic diagram of an elevational view of an oil drum in the compressor according to the present invention;

FIG. 4 is a schematic cross-sectional view taken along the line B-B in FIG. 3;

FIG. 5 is a schematic view of a portion of the area C in FIG. 4;

FIG. 6 is a schematic front view of a support member for a single-stage filtering device in the compressor according to the present invention;

FIG. 7 is a schematic view of another front view of the oil drum in the compressor according to the present invention;

FIG. 8 is a schematic cross-sectional view taken along line D-D of FIG. 7;

FIG. 9 is a schematic view of the structure of the inlet duct of the compressor according to the present invention;

FIG. 10 is a schematic view showing another structure of an intake duct in the compressor according to the present invention;

FIG. 11 is a schematic front view of a splitter in a compressor according to the present invention;

FIG. 12 is a schematic perspective view of a splitter in a compressor according to the present invention;

FIG. 13 is a schematic view of a first perspective view of a multi-stage filtration device in the compressor of the present invention;

FIG. 14 is a second perspective view of a multi-stage filtration unit of the compressor of the present invention;

FIG. 15 is a schematic front view of a multi-stage filter net in the compressor according to the present invention;

FIG. 16 is a schematic view of an assembly structure of a multistage filter screen and an intake duct in the compressor according to the present invention;

FIG. 17 is a schematic view of an assembly of the multistage filter screen and the intake duct of the compressor according to the present invention from another perspective;

FIG. 18 is a schematic structural view (closed state) of an oil collecting cover plate in the compressor according to the present invention;

fig. 19 is a schematic structural view (open state) of an oil collecting cover plate in the compressor according to the present invention.

Description of reference numerals:

1. an outer cylinder; 101. an outer exhaust port; 2. an inner barrel; 201. an inner exhaust port; 202. a first cavity; 203. a second cavity; 3. a gap layer; 301. an annular cavity; 4. a multi-stage filtration device; 401. a multi-stage filter screen; 4011. a first-stage filter screen; 4012. a secondary filter screen; 4013. a third-stage filter screen; 4014. an inner partition plate; 4015. cutting teeth; 4016. an oil collection area; 402. a first cover plate; 403. a second cover plate; 404. an inlet; 405. a first outlet; 406. a second outlet; 407. a first mounting hole; 408. a second mounting hole; 409. an outer panel; 5. a single stage filtration device; 501. a support member; 6. an air intake duct; 601. a main pipeline; 602. a first bypass conduit; 603. a second bypass conduit; 604. a flow divider; 6041. a splitter plate; 6042. a shunt hole; 7. a distance tube; 8. an exhaust bearing seat; 9. an oil collecting cover plate; 901. a fixed block; 902. a fixed shaft; 903. a first flap; 904. a second flap.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1 to 19, a medium-high pressure screw compressor includes a pair of female and male screw rotors which are disposed in parallel and can mesh with each other, a motor which drives the screw rotors to rotate, a capacity control valve which can change a volume ratio, an inverter which can change a rotation speed of the motor, an oil separation barrel which can separate an oil-gas mixture, and an outer shell which is disposed on an outer surface of the compressor.

In addition, the medium-high pressure screw compressor also comprises an air filter, an air inlet controller, a cooler and the like. During operation of the medium-high pressure screw compressor, air firstly passes through the pre-filtering net and then passes through the air filter and the air inlet controller, enters the compression cavity of the screw rotor to be mixed with lubricating oil, linear and continuous compression is carried out on the female screw rotor and the male screw rotor, the compressed oil-gas mixture enters the oil separation barrel to be subjected to oil-gas separation, and the separated compressed air is cooled through the cooler and then is discharged.

Wherein the oil drum comprises an outer drum 1 and an inner drum 2, the inner drum 2 is sleeved in the outer drum 1, a hollow clearance layer 3 is arranged between the outer cylinder 1 and the inner cylinder 2, a multi-stage filtering device 4 is arranged in the inner cylinder 2, a single-stage filtering device 5 is arranged in the gap layer 3, an inner exhaust port 201 is arranged on the inner cylinder 2, the outer cylinder 1 is provided with an outer air outlet 101, the inner air outlet 201 is sleeved in the outer air outlet 101, a hollow annular cavity 301 is formed between the inner exhaust port 201 and the outer exhaust port 101, after the oil-gas mixture compressed by the screw rotor enters the inner barrel 2 through the air inlet pipeline 6, part of the oil gas enters the multistage filtering device 4 for filtering and then is discharged through the inner exhaust port 201, and the rest of the oil gas mixture enters the gap layer 3, is filtered by the single-stage filtering device 5 and then is discharged through the annular cavity 301.

Preferably, more than 60% of the oil-gas mixture enters the multistage filtering device 4 for filtering and separating, and the rest of the oil-gas mixture enters the single-stage filtering device 5 for filtering and separating.

More preferably, more than 75% of the oil-gas mixture enters the multistage filtering device 4 for filtering and separating, and the rest of the oil-gas mixture enters the single-stage filtering device 5 for filtering and separating.

As some embodiments of this application, as shown in fig. 1-5, the lateral wall of oil branch bucket is ring shape, and the bottom is the arc curved surface of protruding form, multi-stage filtration device 4 sets up the middle part of inner tube 2, multi-stage filtration device 4 is cylindricly wholly, multi-stage filtration device 4's the central axis with the central axis coincidence setting of inner tube 2, through multi-stage filtration device 4 will space in the inner tube 2 has divided into two parts, wherein, will be close to the space of bottom and be called first cavity 202, will keep away from the space of bottom and be called second cavity 203 the exhaust end of screw rotor sets up exhaust bearing frame 8, exhaust bearing frame 8 stretches into in the second cavity 203 to through distance tube 7 with multi-stage filtration device 4 is connected. The air inlet pipeline 6 is located at the end of the exhaust bearing seat 8, one end of the air inlet pipeline 6 is communicated with the exhaust bearing seat 8, and the other end of the air inlet pipeline 6 penetrates through the multistage filtering device 4 and is communicated with the first cavity 202 at the bottom of the inner barrel 2. The oil-gas mixture compressed by the screw rotor passes through the exhaust bearing seat 8 and then enters the air inlet pipeline 6.

As some embodiments of the present application, as shown in fig. 9, the intake duct 6 includes a main duct 601, a first bypass duct 602, and a second bypass duct 603, one end of the main duct 601 is communicated with the exhaust bearing base 8, the other end of the main duct 601 is respectively communicated with the first bypass duct 602 and the second bypass duct 603, the first bypass duct 602 is communicated with the first cavity 202, and the second bypass duct 603 is communicated with the gap layer 3. In this way, the oil-gas mixture in the main pipe 601 can enter the inner barrel 2 and the clearance layer 3 through the first bypass pipe 602 and the second bypass pipe 603, respectively. At this time, the ratio of the oil-gas mixture introduced into the multistage filtering device 4 and the single-stage filtering device 5 can be adjusted by adjusting the inner diameters of the first bypass line 602 and the second bypass line 603.

As some embodiments of the present application, as shown in fig. 8, the intake duct 6 includes a main duct 601 and a splitter 604, one end of the main duct 601 is communicated with the exhaust bearing seat 8, the other end of the main duct 601 passes through the multistage filtering device 4 and then is communicated with the first cavity 202, the splitter 604 includes a diversion hole 6042, and the diversion hole 6042 is a plurality of through holes disposed on the bottom wall of the inner tube 2. Preferably, the diversion hole 6042 is arranged right opposite to the outlet of the main pipe 601. Thus, the oil-gas mixture in the intake pipe 6 can enter the first cavity 202 in the inner cylinder 2 through the main pipe 601, then part of the oil-gas mixture enters the multistage filtering device 4 for filtering and separation, and the rest of the oil-gas mixture enters the gap layer 3 through the diversion hole 6042 and is filtered and separated through the single-stage filtering device 5.

As some embodiments of the present application, the proportion of the oil-gas mixture entering the first cavity 202 and the gap layer 3 can be adjusted by adjusting the number or the aperture of the branch flow holes 6042.

As some embodiments of this application, as shown in fig. 10 ~ 12, inlet duct 6 includes trunk line 601 and shunt 604, the one end of trunk line 601 with exhaust bearing frame 8 is linked together, the other end of trunk line 601 passes behind the multistage filter equipment 4 with first cavity 202 is linked together, shunt 604 includes splitter 6041 and reposition of redundant personnel hole 6042, diverter hole 6042 is for setting up a plurality of through-holes on the 2 diapalls of inner tube, splitter 6041 is a plurality of separation blade that are radial distribution, splitter 6041's the central axis with the central axis of trunk line 601 is on same straight line, just splitter 6041 with the export of trunk line 601 is connected. Thus, the oil-gas mixture in the main pipe 601 can enter the first cavity 202 in the inner cylinder 2 through the main pipe 601, then part of the oil-gas mixture enters the multistage filtering device 4 for filtering and separation, and the rest of the oil-gas mixture enters the gap layer 3 through the shunting hole 6042 and is filtered and separated through the single-stage filtering device 5. The arrangement of the splitter 6041 enables the direction of the oil-gas mixture discharged from the main pipe 601 in the circumferential direction to be adjusted as required, and if the splitter 6041 is uniformly distributed along the central axis of the splitter, the oil-gas mixture discharged from the main pipe 601 in the circumferential direction can be uniformly distributed.

As some embodiments of the present application, the flow dividing holes 6042 of the flow divider 604 may be uniformly arranged on the bottom wall of the inner barrel 2, i.e. the number and size of the flow dividing holes 6042 between two adjacent flow dividing plates 6041 are the same.

As some embodiments of the present disclosure, as shown in fig. 11 to 12, the diversion holes 6042 on the diverter 604 may also be disposed unevenly on the bottom wall of the inner cylinder 2, that is, the number and/or size of the diversion holes 6042 between two adjacent diversion plates 6041 are not consistent, so that the ratio and direction of the oil-gas mixture entering the inner cylinder 2 and the gap layer 3 can be regulated by the size and position of the diversion holes 6042. For example, when the inlet 404 of the multistage filtering device 4 is located at the upper part of the inner cylinder 2 and the oil storage tank is located at the lower part of the inner cylinder 2, the upper part of the splitter 604 is not provided with the splitter holes 6042, and the area of the splitter holes 6042 at the lower part is enlarged, so that after the mixture discharged from the main pipe 601 is guided by the splitter 604, the gas at the upper part can directly move upwards to the vicinity of the inlet 404, and the rest of the gas mainly enters the gap layer 3 through the splitter holes 6042, thereby, on one hand, avoiding the excessively complicated and violent gas flow disturbance inside the oil separation barrel, and reducing vibration and noise; on the other hand, the lower air flow can be prevented from directly rushing to the lower oil storage tank under the guiding action of the flow divider 604, and the lubricating oil separated in the oil storage tank can be prevented from being disturbed.

As some embodiments of the present application, as shown in fig. 13 to 17, the multistage filter apparatus 4 includes a multistage filter screen 401, a first cover plate 402, a second cover plate 403, and an outer plate 409, the first cover plate 402 and the second cover plate 403 are respectively located at two sides of the multistage filter screen 401, the outer plate 409 is disposed around an outer edge of the multistage filter screen 401, an internal hollow filter cavity is formed by the first cover plate 402, the second cover plate 403, and the outer plate 409 cooperating with each other, the multistage filter screen 401 is located in the filter cavity, an inner partition 4014 is disposed inside the multistage filter apparatus 4, the inner partition 4014 penetrates through the multistage filter screen 401, two ends of the 4014 are respectively connected to the first cover plate 402 and the second cover plate 403, an inner space of the filter cavity is divided into a plurality of sub-filter cavities by the inner partition 4014, meanwhile, the inner partition 4014 further divides the multistage filter screen 401 into a plurality of sub-filter screens, and the sub-filter screens are arranged in one-to-one correspondence with the sub-filter cavities, so that each sub-filter cavity is provided with a corresponding sub-filter screen and spaces located at two sides of the sub-filter screen.

Furthermore, a fluid channel is arranged on the inner partition 4014 between two adjacent sub-filtration cavities, and through the fluid channel, the oil-gas mixture entering the multistage filtration device 4 can sequentially flow through the sub-filtration cavities and sequentially pass through the sub-filtration screens in the sub-filtration cavities, so that multistage filtration is realized. Preferably, according to the sequence of the oil-gas mixture passing through each sub-filter cavity, the aperture of the filter holes in the sub-filter screens in each sub-filter cavity is gradually reduced, but the total opening area of the filter holes in the sub-filter screens in each sub-filter cavity is larger and larger. The total opening area of the neutron filtering holes is the product of the opening area of a single filtering hole and the total number of the filtering holes. Along the flowing direction of the fluid, the aperture of the filtering hole in each sub-filtering cavity is set to be gradually reduced, so that the filtering effect of each time can be sequentially improved; and the total opening area of the filter holes in each sub-filter cavity is gradually increased, so that the filter resistance can be reduced, and the filter efficiency can be improved.

Preferably, the multistage filtering device 4 comprises 2-5 sub-filtering cavities.

More preferably, the multistage filter device 4 comprises 3 sub-filter chambers.

The structure of the multistage filter device 4 is described in detail by specific embodiments, as shown in fig. 13 to 17, the multistage filter device 4 includes a multistage filter screen 401, a first cover plate 402, a second cover plate 403, and an outer plate 409, the multistage filter screen 401, the first cover plate 402, and the second cover plate 403 are circular, the outer plate 409 is circular, the first cover plate 402 and the second cover plate 403 are respectively located at two sides of the multistage filter screen 401, the outer plate 409 is disposed around an outer edge of the multistage filter screen 401, wherein the outer plate 409 may be an annular wall separately disposed in the inner cylinder 2, the outer plate 409 may be directly formed by a side wall of the inner cylinder 2, the first cover plate 402, the second cover plate 403, and the outer plate 409 cooperate with each other to form an inner hollow filter cavity, an inner partition 4014 is disposed inside the multistage filter device 4, the inner partition 4014 penetrates the multistage filter screen 401, two ends of the inner partition 4014 are respectively connected with the first cover plate 402 and the second cover plate 403, the inner space of the multistage filter device 4 is divided into three sub-filter cavities through the inner partition 4014, the three sub-filter cavities are respectively a first sub-filter cavity, a second sub-filter cavity and a third sub-filter cavity, each sub-filter cavity is internally provided with a corresponding sub-filter screen and spaces located on two sides of the sub-filter screen, the first sub-filter cavity, the second sub-filter cavity and the third sub-filter cavity are fan-shaped, and the first sub-filter cavity, the second sub-filter cavity and the third sub-filter cavity are matched with each other and can form a complete circle.

Further, interior baffle 4014 follows multistage filter screen 401's radial setting will multistage filter screen 401 divides into a plurality of fan-shaped sub filter screens, wherein is located sub filter screen in the first sub filter chamber is one-level filter screen 4011, is located sub filter screen in the second sub filter chamber is second grade filter screen 4012, is located sub filter screen in the third sub filter chamber is tertiary filter screen 4013, the aperture of filtration pore reduces in proper order on one-level filter screen 4011, second grade filter screen 4012, the tertiary filter screen 4013, but the total open area of filtration pore is bigger and bigger.

Further, set up on the interior baffle 4014 and cut tooth 4015, it is setting up to cut tooth 4015 the cockscomb structure fretwork portion of interior baffle 4014 one side, through cut tooth 4015 and formed fluid passage, make the entering oil gas mixture in the multistage filter equipment 4 can flow through in proper order one-level filter screen 4011, second grade filter screen 4012 and tertiary filter screen 4013. Specifically, the first cover plate 402 is located on one side of the multistage filter device 4 away from the bottom of the inner cylinder 2, the second cover plate 403 is located on one side of the multistage filter device 4 close to the bottom of the inner cylinder 2, an inlet 404 of the multistage filter device 4 is arranged on the second cover plate 403, two ends of the inlet 404 are respectively communicated with one sides of the first cavity 202 and the first sub-filter chamber close to the second cover plate 403, after an oil-gas mixture in the first cavity 202 enters the first sub-filter chamber through the inlet 404, the oil-gas mixture passes through the first filter screen 4011 to one side of the first sub-filter chamber close to the first cover plate 402, then flows to one side of the second sub-filter chamber close to the first cover plate 402 through the shear teeth 4015 on the inner partition 4014 arranged between the first sub-filter chamber and the second sub-filter chamber, and then passes through the second filter screen 4012 to one side of the second sub-filter chamber close to the second cover plate 403, and then the gas flows to one side of the third sub-filter cavity close to the second cover plate 403 through shear teeth 4015 arranged on an inner partition plate 4014 between the second sub-filter cavity and the third sub-filter cavity, and continues to flow and pass through a third-stage filter screen 4013 to one side of the third sub-filter cavity close to the first cover plate 402, a first outlet 405 is arranged at one side of the third sub-filter cavity close to the first cover plate 402, the gas obtained after filtering and separation is discharged into the second cavity 203 through the first outlet 405, the second cavity 203 is communicated with the inner exhaust port 201, and the gas in the second cavity 203 can be discharged through the inner exhaust port 201.

Preferably, after the multistage filter device 4 is assembled into the inner barrel 2, in a use state, the first sub-filter chamber and the second sub-filter chamber are located at the upper part of the multistage filter device 4, and the third sub-filter chamber is located at the lower part of the multistage filter device 4.

Preferably, the oil collecting regions 4016 are respectively arranged at the lower parts of the sub-filter cavities, and the lubricating oil obtained by separation and filtration in each sub-filter cavity can be firstly collected in the oil collecting regions 4016 and then conveyed to an oil collecting tank at the lower part of the inner barrel 2 through an oil pipeline communicated with the bottom of the oil collecting regions 4016 under the action of gravity.

As some embodiments of the present application, the lower regions of the first-stage filter screen 4011, the second-stage filter screen 4012 and the third-stage filter screen 4013 are not provided with filter holes, and the regions on the filter screens which are not provided with filter holes are matched with the first cover plate 402 and the second cover plate 403 to form an oil collecting region 4016, so that the lubricating oil separated out from each sub-filter cavity is firstly gathered in the oil collecting region 4016 under the action of gravity and then conveyed to an oil collecting tank at the lower part of the inner barrel 2 through an oil pipeline communicated with the bottom of the oil collecting region 4016.

As some embodiments of the present application, a second outlet 406 is provided on the second cover plate 403, one end of the second outlet 406 is located above the oil reservoir, and the other end is communicated with the oil collecting area 4016 in the third sub-filter cavity. The oil pipelines at the bottoms of the oil collecting areas 4016 in the first sub-filter cavity and the second sub-filter cavity can be directly communicated with the oil storage tank, and also can be firstly communicated with the oil collecting area 4016 in the third sub-filter cavity, so that the lubricating oil separated from the first sub-filter cavity and the second sub-filter cavity is firstly conveyed to the oil collecting area 4016 in the third sub-filter cavity through the oil pipelines under the action of gravity and then is discharged through the second outlet 406.

As some embodiments of the present application, the multistage filter device 4 is further provided with a first mounting hole 407 and a second mounting hole 408, the first mounting hole 407 is used for connecting with the distance tube 7, and the air inlet pipe 6 passes through the second mounting hole 408.

As some embodiments of the present application, as shown in fig. 4, 18, and 19, an oil collecting cover plate 9 is disposed on the oil storage tank, the oil collecting cover plate 9 includes a fixing block 901, a fixing shaft 902, a first turning plate 903 and a second turning plate 904, the fixing block 901 and the fixing shaft 902 are fixedly disposed above the oil storage tank at intervals, the first turning plate 903 and the second turning plate 904 are rotatably disposed on the fixing shaft 902 through a sleeve, the first turning plate 903 and the second turning plate 904 are respectively located on two sides of the fixing shaft 902, the thickness of the first turning plate 903 is greater than that of the second turning plate 904, the area of the first turning plate 903 is smaller than that of the second turning plate 904, so that the weight of the first turning plate 903 is greater than that of the second turning plate 904. When the oil collecting cover plate 9 is in a closed state, the first turning plate 903 is lapped on the upper side of the fixing block 901, the second turning plate 904 is suspended above the oil storage tank, in the working process of the compressor, the lubricating oil discharged from the second outlet 406 continuously flows into the second turning plate 904, and when the weight of the second turning plate 904 and the lubricating oil on the second turning plate 904 is larger than that of the first turning plate 903, the second turning plate 904 rotates downwards around the fixing shaft 902 and simultaneously drives the first turning plate 903 to rotate upwards around the fixing shaft 902 so as to open the oil collecting cover plate 9. Then, the lubricating oil on the second turning plate 904 slides into the oil storage tank, the weight of the second turning plate 904 is smaller than that of the first turning plate 903 again, the first turning plate 903 rotates downwards around the fixed shaft 902 under the action of gravity, and simultaneously drives the second turning plate 904 to rotate upwards around the fixed shaft 902, and the oil collecting cover plate 9 is closed again. Therefore, the oil collecting cover plate 9 can be opened in stages, the lubricating oil separated from the oil storage tank is prevented from being disturbed by the airflow in the inner barrel 2 and being splashed again, and the oil content effect is reduced. In addition, in the inner cylinder 2, the lubricating oil separated from the oil-gas mixture due to the impact on the wall of the inner cylinder 2 can also directly slide onto the oil collecting cover plate 9 and then flow into the oil storage tank.

Preferably, the upper surface of the first flap 903 is gradually raised from the side away from the fixed shaft 902 to the side close to the fixed shaft 902, and the upper surface of the second flap 904 is lower than the lower surface of the first flap 903, so that the lubricating oil falling on the first flap 903 can spontaneously flow onto the second flap 904 under the action of gravity without collecting on the first flap 903.

As some embodiments of the present application, as shown in fig. 6, the single-stage filtering apparatus 5 includes an annular filter screen disposed in the gap layer 3 and an annular support 501, and the annular support 501 is located at one side or both sides of the annular filter screen to support and fix the annular filter screen. The gas separated by the single-stage filter 5 can be directly discharged through the annular chamber 301, and the lubricating oil separated by the single-stage filter 5 can be discharged through an oil discharge passage provided at the lower portion of the outer cylinder 1. The oil discharge channel at the lower part of the outer cylinder 1 can directly refer to the structure in the existing oil distribution barrel, and the details are not repeated.

The working principle of the oil drum in the medium-high pressure screw compressor is as follows: the oil-gas mixture entering the inner barrel 2 through the air inlet pipeline 6 is mostly subjected to multi-stage filtration through the multi-stage filtration device 4 so as to ensure the integral oil-gas separation effect of the oil separation barrel; the remaining small part of the oil-gas mixture enters a single-stage filtering device 5 for simple filtering; in the filtering process, the compressed gas filtered by the multistage filtering device 4 has good filtering effect but is difficult to discharge because the filtering channel is tortuous, the filtering times are many, the resistance is large, and the flow speed reduction amplitude is large, while the compressed gas simply filtered by the single-stage filtering device 5 has simple filtering process and high flow speed, at the moment, the compressed gas is discharged by the annular cavity 301 formed by the outer exhaust port 101 and the inner exhaust port 201, and a high-speed flowing annular airflow can be formed around the annular cavity 301 to form a structure similar to a bladeless fan, the low-speed airflow in the inner exhaust port 201 is taken out by the viscous force of the annular airflow, the gas increment is realized between the annular cavity 301 and the inner exhaust port 201, the purpose of accelerating the discharge of the airflow in the inner exhaust port 201 is realized, and the compressor not only can promote the rapid discharge of the compressor through experimental verification, satisfy low reaches equipment demand, can improve oil-gas separation efficiency moreover by a wide margin, all use single stage filter equipment to filter with oil-gas mixture and compare, this application oil content bucket oil-gas separation efficiency can improve by a wide margin. In addition, the mode of dividing the multistage filtering device 4 into a plurality of sub-filtering cavities can increase filtering passes and improve the filtering effect on the premise of not increasing the occupied space.

In conclusion, it is not difficult to obtain, the medium-high pressure screw compressor stated in this application has that the oil-gas separation is effectual, the exhaust is smooth and easy, and filter equipment occupation space is little advantage.

Although the present invention is disclosed above, the present invention is not limited thereto. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a well high-pressure screw compressor, includes a pair of parallel arrangement, and can intermeshing's cloudy, positive screw rotor, drive screw rotor pivoted motor, can separate oil content bucket and the shell body of setting at the compressor surface of oil gas mixture, its characterized in that, oil content bucket includes urceolus (1) and inner tube (2), inner tube (2) cover is established the inside of urceolus (1):

a hollow clearance layer (3) is arranged between the outer cylinder (1) and the inner cylinder (2); a multi-stage filtering device (4) is arranged in the inner barrel (2), a single-stage filtering device (5) is arranged in the gap layer (3), an inner exhaust port (201) is arranged on the inner barrel (2), an outer exhaust port (101) is arranged on the outer barrel (1), the inner exhaust port (201) is sleeved in the outer exhaust port (101), and a hollow annular cavity (301) is formed between the inner exhaust port (201) and the outer exhaust port (101);

and after the oil-gas mixture compressed by the screw rotor enters the inner cylinder (2) through the air inlet pipeline (6), part of the oil-gas mixture enters the multistage filtering device (4) for filtering and is discharged through the inner exhaust port (201), and the rest of the oil-gas mixture enters the clearance layer (3), is filtered by the single-stage filtering device (5) and is discharged through the annular cavity (301).

2. The medium-high pressure screw compressor according to claim 1, characterized in that more than 60% of the oil-gas mixture enters the multistage filtration device (4) for filtration and separation, and the remaining oil-gas mixture enters the single-stage filtration device (5) for filtration and separation.

3. The medium-high pressure screw compressor according to claim 1, wherein the multistage filtering device (4) divides the space in the inner cylinder (2) into two parts, the space near the bottom is a first cavity (202), the space far away from the bottom is a second cavity (203), one end of the air inlet pipe (6) is communicated with the exhaust bearing seat (8), and the other end of the air inlet pipe is communicated with the first cavity (202) after passing through the multistage filtering device (4).

4. The medium-high pressure screw compressor according to claim 1, wherein the multistage filtering device (4) has an inlet (404) and a first outlet (405), the inlet (404) is in communication with the first cavity (202), the oil-gas mixture in the first cavity (202) can enter the multistage filtering device (4) through the inlet (404), the first outlet (405) is in communication with the second cavity (203), the second cavity (203) is in communication with the inner exhaust port (201), and the gas filtered by the multistage filtering device (4) is discharged through the first outlet (405).

5. Medium-high pressure screw compressor according to claim 3, characterized in that said intake duct (6) comprises a main duct (601), a first bypass duct (602) and a second bypass duct (603), the two ends of said first bypass duct (602) being in communication with said main duct (601) and said first cavity (202) respectively, the two ends of said second bypass duct (603) being in communication with said main duct (601) and said clearance layer (3) respectively.

6. The medium-high pressure screw compressor according to claim 3, wherein the air inlet pipe (6) comprises a main pipe (601) and a diverter (604), one end of the main pipe (601) is communicated with the exhaust bearing seat (8), the other end of the main pipe (601) penetrates through the multistage filtering device (4) and then is communicated with the first cavity (202), the diverter (604) comprises a diversion hole (6042), the diversion hole (6042) is a plurality of through holes arranged on the bottom wall of the inner barrel (2), and the diversion hole (6042) is arranged right at the outlet of the main pipe (601).

7. The medium-high pressure screw compressor according to claim 6, wherein the flow divider (604) further comprises a flow dividing piece (6041), the flow dividing piece (6041) is a plurality of separation blades distributed radially, and the central axis of the flow dividing piece (6041) and the central axis of the main pipeline (601) are on the same straight line.

8. The medium-high pressure screw compressor according to claim 1, wherein the multistage filtering device (4) comprises a multistage filtering net (401), a first cover plate (402), a second cover plate (403) and an outer side plate (409), the first cover plate (402), the second cover plate (403) and the outer side plate (409) are matched with each other to form a hollow filtering cavity, the multistage filtering net (401) is located in the filtering cavity, an inner partition plate (4014) is arranged in the multistage filtering device (4), the inner space of the filtering cavity is divided into a plurality of sub-filtering cavities by the inner partition plate (4014), the inner partition plate (4014) divides the multistage filtering net (401) into a plurality of sub-filtering nets, and the sub-filtering nets and the sub-filtering cavities are arranged in one-to-one correspondence.

9. The medium-high pressure screw compressor according to claim 8, characterized in that a fluid channel is arranged on the inner partition (4014) between two adjacent sub-filter chambers, through which the oil-gas mixture entering the multistage filter device (4) can flow through each sub-filter chamber in turn and pass through the sub-filter screens in each sub-filter chamber in turn.

10. The medium-high pressure screw compressor according to claim 9, characterized in that a shear tooth (4015) is provided on the inner partition plate (4014), said shear tooth (4015) being a serrated cutout provided on one side of the inner partition plate (4014), said fluid passage being formed by said shear tooth (4015).