Integrated dry type oil-free screw main engine and gear box thereof

Abstract

The utility model discloses an integrated dry type oil-free screw main engine and a gear box thereof, and belongs to the technical field of compressor oil mist treatment. The gear box in the integrated dry type oil-free screw main engine comprises a gear box shell and an input shaft, a gear transmission set is installed in the gear box shell, one end of the input shaft is fixedly connected with the output end of a driving mechanism, and the other end of the input shaft extends into the gear box shell. Screw rotors in the high-pressure machine head and the low-pressure machine head are driven by a gear transmission group; the supporting bearing, the primary separator and the centrifugal impeller are located in the gearbox shell and sequentially arranged outside the input shaft in a sleeving mode in the flowing direction of the oil mist channel, and the centrifugal impeller is fixedly connected with the input shaft. According to the scheme, the oil mist treatment mechanism is integrated in the gear box, so that oil mist in the gear box can be efficiently treated, and the oil mist in the gear box is prevented from permeating into an oil-free rotor compression cavity.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressor oil mist treatment technical field more specifically, relate to integrated dry type oil -free screw host and its gear box. BACKGROUND

[0002] In the field of dry type oil -free screw compressor, the compression process of air in the screw rotor is oil -free, but the bearing and gear outside the rotor compression cavity need oil lubrication, so various sealing structure forms are adopted in design to avoid oil entering the oil -free compression cavity. Dry type oil -free screw compressor is not lubricated by oil during the air rotor compression process, so its volumetric efficiency is very low. By improving the speed of the rotor, the volumetric efficiency of the compressor can be improved, so the speed of the rotor in the dry type oil -free screw compressor on the market is basically ten thousand revolutions, so the transmission gear in the variable speed gear box and the rotor precision synchronous gear in the host will form a large amount of oil mist due to the high speed extrusion and high speed centrifugal impact and splashing of the lubricating oil film in work. If these oil mists cannot be effectively treated, they will leak out and cause environmental pollution. Moreover, the increase of oil temperature in the gear box will cause positive pressure in the gear box. When the gear box is in a positive pressure state, oil mist may penetrate into the oil -free rotor compression cavity through the sealing assembly, thereby causing the contamination of compressed air.

[0003] If the oil mist of the gear box is directly discharged to the atmosphere, it will cause air pollution, and the system lubricating oil will be reduced, which will have adverse effects on subsequent lubrication. The existing gear box oil mist treatment method generally sets an oil mist treatment device connected with the gear box outside the gear box. This kind of treatment method needs an external power source, such as electricity, compressed air, etc. on the one hand, and on the other hand, the complexity of the external equipment will lead to an increase in the volume of the compressor host and a higher cost.

[0004] For example, the Chinese patent with application number 2022219008217 discloses an electric oil mist recycler for dry screw air compressor, which includes a recovery box body, an oil mist filter element and a fan. The recovery box body has an oil mist inlet, the oil mist filter element is arranged in the recovery box body, the oil mist filter element is connected to the oil mist inlet and communicates with the dry screw host through the oil mist inlet, the bottom of the recovery box body has an oil return port, the oil return port is connected to the host oil tank, the oil mist filter element filters the oil mist and forms oil droplets, so that the oil droplets are recovered to the host oil tank through the oil return port, the top of the recovery box body has an exhaust port, and the fan is arranged in the recovery box body to discharge clean air in the recovery box body to the atmosphere. Although the application can effectively solve the problem of oil mist treatment of dry compressor and better avoid the entry of oil mist into the gas compression cavity or atmosphere through the body sealing structure. However, the application still belongs to the external oil mist processor of the gear box.

[0005] For example, the Chinese patent application No. 2010202686484 discloses an oil mist separation device for gear box of oil-free screw compressor, which comprises a shell and an oil mist separation core body. The oil mist separation core body is installed in the cavity of the shell. The shell is provided with a purified air outlet communicating with the cavity of the shell. The shell is also provided with a pressure air inlet channel and an oil mist inlet communicating with the compressor exhaust pipeline. One end of the oil mist inlet communicates with the inner cavity of the gear box, and the other end communicates with the pressure air inlet channel. A nozzle is installed in the pressure air inlet channel. The nozzle extends into the air inlet of the inner joint. A gap of 2-3 mm is provided between the nozzle and the air inlet of the inner joint. The gap communicates with the oil mist inlet. The air outlet of the inner joint communicates with the air inlet of the oil mist separation core body. An oil discharge hole is formed in the shell and communicates with the inner cavity of the shell. The oil discharge hole communicates with an oil collecting pipe. The application uses the pressure air generated by the compressor as power to suck the oil mist into the filter core through the negative pressure generated around the nozzle. However, the application also belongs to the type of external oil mist processor connected to the gear box.

[0006] For example, the Chinese patent application No. 2023206179255 discloses an oil mist separation device for gear box of compressor, which comprises a primary separation cylinder. A centrifugal motor is fixedly connected to the left side of the primary separation cylinder. A rotating shaft is fixedly connected to the output end of the centrifugal motor. The rotating shaft is rotatably connected inside the primary separation cylinder. At least one centrifugal blade is fixedly connected to the surface of the rotating shaft. At least one reinforcing ring is fixedly connected to the middle of the centrifugal blade. A through hole is formed through the surface of the reinforcing ring. A partition ring plate is fixedly connected inside the primary separation cylinder. At least one oil leakage hole is formed in the surface of the partition ring plate. An annular cavity one is formed between the partition ring plate and the inner wall of the primary separation cylinder. A wind resistance arc plate one is fixedly connected to the inner side surface of the partition ring plate. A communication pipe is fixedly connected to the right side of the primary separation cylinder. The right end of the communication pipe is fixedly connected with a secondary separation cylinder. The application sets two separation cylinders to reduce the separation pressure of the secondary separation cylinder, which is beneficial to improve the recovery efficiency of oil mist. However, the application also belongs to the type of external oil mist processor connected to the gear box. Practical new type content

[0007] 1. Technical problem to be solved

[0008] In view of the technical problem that the existing technology usually needs to set an oil mist treatment device outside the gear box, resulting in a large size of the compressor main body and the need for external connection, the utility model provides an integrated dry oil-free screw main machine and its gear box. The scheme integrates the oil mist treatment mechanism inside the gear box, which can efficiently treat the oil mist in the gear box and prevent the oil mist in the gear box from penetrating into the oil-free rotor compression cavity through the sealing assembly.

[0009] 2. Technical scheme

[0010] To achieve the above purpose, the technical scheme provided by the utility model is:

[0011] The utility model discloses a first aspect provides a kind of integrated dry type oil-free screw host gear box, the gear box includes gear box shell and input shaft, gear transmission mechanism is installed in the inside of the gear box shell, the output end of driving mechanism is fixedly connected with the one end of input shaft, the other end of input shaft is inserted into the inside of gear box shell, it is driven high-pressure machine head, screw rotor movement in low-pressure machine head by gear transmission group;Support bearing, primary separator, centrifugal impeller are installed in the inside of gear box shell, and are sequentially fitted in the outside of input shaft along the flow direction of oil mist channel, wherein centrifugal impeller is fixedly connected with input shaft.

[0012] Further, the primary separator includes a separator outer ring and a separator inner ring, the input shaft is fitted inside the separator inner ring and there is a gap between the input shaft and the separator inner ring; the separator outer ring and the separator inner ring are fixedly connected by a plurality of baffle plates distributed in parallel and at intervals, a baffle passage is formed between adjacent baffle plates, a first oil collection groove is provided in the separator outer ring and communicates with the baffle passage, and the first oil collection groove communicates with the oil collection groove of the gear box air inlet.

[0013] Further, the separator outer ring and the separator inner ring are fixedly connected by a plurality of baffle plates distributed in parallel and at intervals, a baffle passage is formed between adjacent baffle plates, a first oil collection groove is provided in the separator outer ring and communicates with the baffle passage, and the first oil collection groove communicates with the oil collection groove of the gear box air inlet.

[0014] Further, the baffle plates each include a baffle main plate extending in the axial direction of the input shaft, staggered baffle fins are provided on both sides of the baffle main plate, and the inner side surface and the outer side surface of the baffle fins form a V-shaped groove, the opening of the V-shaped groove is 40-60°, and the baffle fins of adjacent baffle main plates are staggered along the axial direction of the input shaft.

[0015] Further, the first oil collection groove includes a radial oil collection groove and a plurality of axial oil collection grooves arranged in parallel and at intervals along the circumference, the axial oil collection grooves extend along the axial direction of the input shaft and penetrate through the separator outer ring, and communicate with the baffle passage, and the radial oil collection groove extends along the circumferential direction of the separator outer ring and communicates with the plurality of axial oil collection grooves.

[0016] Further, one end of the primary separator is in contact with the outer ring of the support bearing, and the other end of the primary separator is axially fixed by a retainer ring.

[0017] Further, the outer side of the primary separator is further provided with at least two limiting blocks distributed at intervals along the circumferential direction, and the limiting blocks are installed in the oil collection groove of the gear box air inlet.

[0018] Further, the centrifugal impeller comprises a coaxial impeller inner ring and an upper ring, the input shaft is sleeved in the impeller inner ring and fixedly connected with the impeller inner ring; one end of the impeller inner ring extends radially to form a lower ring; the upper ring is located at the other end of the impeller inner ring and forms an annular impeller inlet groove between the two; a plurality of impeller blades are arranged between the lower ring and the upper ring and spaced along the annular direction.

[0019] Further, the inside of the gear box located at one side of the input shaft is further provided with a secondary separator, and the exhaust end of the centrifugal impeller is connected in communication with the air inlet end of the secondary separator through an exhaust connecting hole.

[0020] Further, the further comprises a gland for limiting the secondary separator in the inside of the gear box shell, a gland adjusting port corresponding to the exhaust connecting hole is formed on one side of the top of the gland, wherein the caliber of the exhaust connecting hole opposite to the gland adjusting port can be adjusted.

[0021] Further, two shell connecting holes symmetrically arranged in the circumferential direction are formed on the top of the gland, and the shell connecting holes are waist-shaped holes.

[0022] Further, the oil collecting groove of the secondary separator is communicated with the oil collecting groove of the gear box air inlet.

[0023] Further, the secondary separator is a precision oil separation core.

[0024] The utility model discloses a second aspect provides a kind of integrated dry oil-free screw host, including high-pressure head, low-pressure head and above gear box.

[0025] The technical scheme of the utility model has the following beneficial effects compared with the prior art:

[0026] (1) the utility model discloses a support bearing, primary separator, centrifugal impeller is sequentially sleeved in the outside of input shaft along the flow direction of oil mist channel, realizes the integration of oil mist treatment function in the inside of gear box.Specifically, centrifugal impeller rotates with input shaft, centrifugal impeller drives oil mist to flow in gear box, primary separator separates the gas with a large amount of oil mist, reduces the content of oil mist particles in gas, so as to not only realize the treatment of oil mist, but also need not external gas source or other power, machine use efficiency increases, cost reduces.Meanwhile, compressor host need not external oil mist treatment equipment, so it is more simple and beautiful.In addition, the oil mist amount handled by centrifugal impeller is large, so that the oil mist in the gear box keeps a low level.

[0027] (2) This utility model further adds a secondary separator downstream of the centrifugal impeller to further separate the oil mist in the gearbox, thereby making the separated gas cleaner. Furthermore, the oil mist separated by the primary separator and the secondary separator flows back to the gearbox, reducing the loss of lubricating oil. The oil mist treatment system circulates inside the gearbox and is not directly discharged into the atmosphere, preventing environmental pollution.

[0028] (3) The present invention further optimizes the design of the oil mist flow channel between the centrifugal impeller and the secondary separator. The cover not only fixes the secondary separator in the gearbox housing, but also has a cover adjustment port on its outer side wall. The air inlet diameter of the cover adjustment port can be adjusted. The oil mist passes through the centrifugal impeller, the cover adjustment port and the secondary separator in sequence, thereby controlling the slight difference between the air intake and exhaust volume of the gearbox, and thus keeping the inside of the gearbox in a slightly negative pressure state, which can prevent the oil mist from escaping and leaking inside. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the integrated dry oil-free screw compressor in an embodiment of this utility model.

[0030] Figure 2 As an embodiment of this utility model Figure 1 Schematic diagram of cross-section at point AA.

[0031] Figure 3 This is a three-dimensional structural diagram of the primary separator in an embodiment of this utility model.

[0032] Figure 4 This is a cross-sectional schematic diagram of the primary separator in an embodiment of this utility model.

[0033] Figure 5 This is a three-dimensional structural diagram of the centrifugal impeller in an embodiment of this utility model.

[0034] Figure 6 This is a cross-sectional view of the centrifugal impeller in an embodiment of the present invention.

[0035] Figure 7 This is a three-dimensional structural diagram of the pressure cap in an embodiment of the present utility model.

[0036] Figure 8 As an embodiment of this utility model Figure 2 Schematic diagram of cross-section at point BB.

[0037] Figure 9 As an embodiment of this utility model Figure 8 A magnified view of point Z in the middle.

[0038] Label Explanation:

[0039] 1. Input axis;

[0040] 2. The first driving gear;

[0041] 3. The gear box shell; 301, the exhaust connection hole; 302, the first connection oil groove; 303, the second connection oil groove;

[0042] 4. The high pressure head; 401, the first branch;

[0043] 5. The low pressure head; 502, the second branch;

[0044] 6. The centrifugal impeller; 601, the upper ring piece; 602, the impeller piece; 603, the impeller inner ring; 604, the lower ring piece; 605, the input shaft connection hole;

[0045] 7. The primary separator; 701, the baffle; 7011, the baffle main plate; 7012, the baffle blocking piece; 702, the first oil collecting groove; 7021, the radial oil collecting groove; 7022, the axial oil collecting groove; 703, the separator inner ring; 704, the separator outer ring; 705, the limiting block;

[0046] 8. The secondary separator;

[0047] 9. The sealing cover plate;

[0048] 10. The gland; 101, the gland adjusting port; 102, the shell connection hole;

[0049] 11. The support bearing;

[0050] 12. The oil mist air inlet;

[0051] 13. The oil mist exhaust port. DETAILED DESCRIPTION

[0052] In order to further understand the content of the present application, the present application will be described in detail in conjunction with the drawings and examples.

[0053] The structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so that people skilled in the art can understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose of the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like in the specification are only for the convenience of clear description, and are not used to limit the implementation range, the change or adjustment of the relative relationship is not substantially changed without changing the technical content.

[0054] The utility model provides a kind of integrated dry oil-free screw host gear box, reference Figure 1 、 Figure 2 It is shown that gear transmission group is installed in the inside of gear box shell 3, one end of input shaft 1 is fixedly connected with the output end of driving mechanism, the other end of input shaft 1 is inserted into the inside of gear box shell 3, and it drives high-pressure machine head, low-pressure machine head screw rotor movement by gear transmission group.Support bearing 11, primary separator 7, centrifugal impeller 6 are all installed in the inside of gear box shell 3, and are successively sleeved on the outside of input shaft 1 along the flow direction of oil mist channel, wherein centrifugal impeller 6 is fixedly connected with input shaft 1.

[0055] In the gear box of dry screw host, the above-mentioned driving mechanism generally adopts driving motor, the output end of driving motor is fixedly connected with the one end of input shaft 1 located outside gear box shell 3, to drive input shaft 1 to rotate, and then provide input power for dry screw host.Gear transmission group includes first driving gear 2, and first driving gear 2 is fixedly sleeved on the outside of input shaft 1, and first driving gear 2 is engaged with other gears to transmit power to low-pressure machine head 4 and high-pressure machine head 5 screw rotor, to provide power for screw rotor to compress air.It should be understood that first driving gear 2 transmits power to screw rotor here can have multiple specific implementation modes.The specific structure selection of first driving gear 2 to transmit power to low-pressure machine head 4 and high-pressure machine head 5 is prior art, and will not be described in detail here.

[0056] In dry screw host, reference Figure 2 It is shown that oil mist inlet 12 and oil mist exhaust port 13 are arranged in the inside of gear box shell 3, and oil mist flow channel is formed in communication between oil mist inlet 12 and oil mist exhaust port 13, and the specific flow direction is indicated by flow trajectory in Figure 2 .

[0057] It should be understood that, in the gear box, oil mist inlet 12 and oil mist exhaust port 13 are arranged, and oil mist inlet 12 refers to oil mist inlet, and the oil mist inlet 12 does not have to be limited to the starting point of oil mist channel in the inside of gear box, and oil mist inlet 12 is located upstream of support bearing 11 in input shaft 1 along the flow direction of oil mist channel.Oil mist exhaust port 13 refers to the gas outlet after being separated by oil mist primary separator, and the oil mist exhaust port 13 does not have to be the end point of oil mist channel in the inside of gear box, and the oil mist exhaust port 13 is located downstream of centrifugal impeller 6 along the flow direction of oil mist channel.

[0058] The integrated gear box of the dry oil-free screw main machine, wherein the oil mist treatment process is as follows: the centrifugal impeller 6 rotates with the input shaft 1, the rotation of the centrifugal impeller 6 generates negative pressure, without external air source or other power, the oil mist in the gear box can be driven to flow. The primary separator 7 separates the oil mist flowing through the primary separator 7. In addition, since the primary separator 7 is located between the centrifugal impeller 6 and the support bearing 11, the oil mist flowing through the support bearing 11 is the unseparated flowing oil mist, which can well lubricate and cool the support bearing 11, greatly improving the service life of the support bearing 11.

[0059] As a preferred embodiment of the primary separator 7, as shown in Figure 3 、 Figure 4 The primary separator 7 comprises a separator outer ring 704 and a separator inner ring 703 coaxially arranged, the input shaft 1 is sleeved in the separator inner ring 703 and there is a gap between the input shaft 1 and the separator inner ring 703; the separator inner ring 703 and the separator outer ring 704 are fixedly connected through a plurality of baffle plates 701 distributed in parallel and at intervals, the adjacent baffle plates 701 form a baffle channel, the separator outer ring 704 is provided with a first oil collecting groove 702 communicating with the baffle channel, and the first oil collecting groove 702 communicates with the oil collecting groove of the gear box air inlet 12. More specifically, the first connecting oil groove 302 is arranged in the inner wall of the gear box shell 3, and the two ends of the first connecting oil groove 302 respectively communicate with the first oil collecting groove 702 and the oil collecting groove of the gear box air inlet 12. By arranging the first connecting oil groove 302 in the inner wall of the gear box shell 3, the lubricating oil collected through the first connecting oil groove 302 will not be blocked by the outer ring of the support bearing 11, and can flow back to the oil collecting groove of the gear box air inlet 12.

[0060] Further preferably, as shown in Figure 4 Each of the plurality of baffle plates 701 comprises a baffle main plate 7011 extending along the axis of the input shaft 1, baffle fins 7012 are arranged on both sides of the baffle main plate 7011 and are distributed in staggered intervals, and the inner side surface of the baffle main plate 7011 and the outer side surface of the baffle fin 7012 form a V-shaped groove, and the opening degree of the V-shaped groove is 40-60°. The openings of the above-mentioned V-shaped grooves are consistent, and when installed, the V-shaped groove openings between the baffle fins 7012 and the baffle main plates 7011 are arranged opposite to the oil mist flow direction, so that the separation effect of the oil mist is better.

[0061] It should be understood that there are multiple ways to implement the deflector baffles 7012 on both sides of the deflector main board 7011. For example, the deflector baffles 7012 can be symmetrically arranged on both sides of the deflector main board 7011, with the relative deflector baffles 7012 in adjacent deflector main boards 7011 being staggered along the axial direction of the input shaft 1; or the intersection connection points of the deflector baffles 7012 and the deflector main board 7011 can also be arranged at intervals along the axial direction of the input shaft 1. Furthermore, the deflector baffles 7012 can be made of flat plates or curved plates, and the deflector main board 7011 can be made of flat plates, bent corrugated plates, or curved plates, or other existing deflector baffles with deflection functions can be used.

[0062] Furthermore, 5 to 7 staggered baffles 7012 are arranged between two adjacent baffle main boards 7011 along the axis of the input shaft 1. Correspondingly, 3 to 4 baffles 7012 are arranged on one side of each baffle main board 7011. The corresponding baffles 7012 between adjacent baffle main boards 7011 form an oil mist baffle channel with multiple S-shaped bends, thereby causing the oil mist flowing through it to change its flow direction multiple times, thus increasing the number of oil mist separations and extending the separation path, making the oil mist separation more thorough.

[0063] The oil mist separation process of the primary separator 7 is as follows: When the oil mist passes between adjacent baffle main plates 7011, it collides with the baffle plate 7012 under the dual action of gravity and the structure of the baffle plate 701 to change its flow direction. The oil mist particles collide and fold, which increases the size of the oil mist particles. The increased oil mist particles are adsorbed inside the V-shaped groove while the gas continues to flow, thereby separating the oil mist particles from the gas. These oil mist particles will collect in the first oil collection tank 702 connected to the baffle plate 701.

[0064] Regarding the preferred embodiment of the first oil tank 702, refer to... Figure 3 , Figure 8 As shown, the first oil collecting tank 702 includes a radial oil collecting tank 7021 and multiple axial oil collecting tanks 7022 arranged parallel to and at intervals perpendicular to the radial oil collecting tank 7021. The axial oil collecting tanks 7022 extend along the axis of the input shaft 1 and penetrate the outer ring 704 of the separator, and are connected to the baffle channel. The radial oil collecting tank 7021 extends along the circumference of the outer ring 704 of the separator and connects to the multiple axial oil collecting tanks 7022. The oil mist particles in the V-shaped groove of the baffle plate 701 are collected into the axial oil collecting tank 7022 under the action of gravity. The oil droplets in the axial oil collecting tank 7022 are then collected into the oil collecting tank of the gearbox inlet through the radial oil collecting tank 7021, and finally flow into the inside of the gearbox, realizing oil mist circulation.

[0065] More preferably, the baffle 701 is a metal baffle, which can not only improve the oil mist separation efficiency, but also achieve lifelong maintenance-free operation, thereby reducing production and usage costs.

[0066] In a preferred embodiment of the installation of the primary separator 7, one end of the primary separator 7 contacts the outer ring of the support bearing 11, and the retaining ring is preferably an elastic retaining ring. The gearbox housing 3 is correspondingly provided with a groove for accommodating the aforementioned retaining ring. Axial fixation of one end of the primary separator 7 is achieved by contacting the outer ring of the support bearing 11, thereby reducing the number of grooves required inside the gearbox housing 3. More specifically, the other end of the primary separator 7 and the other end of the support bearing 11 are both axially fixed by retaining rings, preferably elastic retaining rings.

[0067] Further preferably, the primary separator 7 is provided with at least two limiting blocks 705 spaced apart along its circumference on its outer side. The limiting blocks 705 are installed in the oil collection groove of the gearbox inlet, thereby limiting the axis of the primary separator 7 to be parallel to the axis of the oil collection groove of the inlet. Specifically, the limiting blocks 705 are disposed on the outer wall of the outer ring 704 of the separator.

[0068] In some embodiments, reference Figure 5 , Figure 6 As shown, the centrifugal impeller 6 includes an inner impeller ring 603 and an upper ring blade 601 coaxially arranged. The input shaft 1 is fitted onto the inner impeller ring 603 and fixedly connected to it. One end of the inner impeller ring 603 extends radially outward to form a lower ring blade 604. The upper ring blade 604 is located at the other end of the inner impeller ring 603 and forms an annular impeller inlet groove between the two. A plurality of impeller blades 602 are provided between the lower ring blade 604 and the upper ring blade 601 at an annular interval.

[0069] As the centrifugal impeller 6 rotates, a gas flow channel is formed between the multiple impeller blades 602. The air within the gas flow channel moves outward under the action of centrifugal force, thereby creating a vacuum in the center of the centrifugal impeller 201. Under the action of the vacuum, oil mist is drawn into the impeller's air inlet groove. The drawn-in oil mist turns 90° at the inlet of the impeller blades 602 and then enters the gas flow channel formed by the blades. Under the action of the impeller blades 602, it gains kinetic and pressure energy and continues to move along the oil mist channel. It should be noted that by designing the air inlet groove of the centrifugal impeller 6 as annular, not only can the oil mist be drawn in more evenly and stably, but the support bearing 11 located upstream along the oil mist flow direction can also be more fully lubricated, and the separation of the primary separator 7 can be more efficient.

[0070] It should be noted that the centrifugal impeller 6 not only drives the oil mist orientation of the gear box shell 3, but also when the oil mist passes through the centrifugal impeller 6, the oil mist particles are thrown to the inner wall of the gear box shell 3 under the centrifugal force of the impeller blade 602, thereby re-separating the oil mist; the separated oil mist flows along the inner wall of the shell to the oil collection tank of the gear box inlet 12.

[0071] It should be noted that the centrifugal impeller 6 has a very large air volume, which is much larger than the oil mist generation amount, so the oil mist concentration inside the gear box shell 3 will be kept in a lower range, greatly reducing the influence of the oil mist problem on the screw compression cavity.

[0072] In other embodiments, regarding the preferred embodiment that the input shaft 1 is sleeved in the impeller inner ring 603 and fixedly connected with the impeller inner ring 603, two key grooves symmetrically distributed along the circumferential direction of the inner wall of the impeller inner ring 603 are provided, and the input shaft 1 is provided with corresponding key grooves, and the impeller inner ring 603 and the input shaft 1 are drivingly connected through the two flat keys symmetrically distributed in the circumferential direction, so as to realize the rotation of the centrifugal impeller 6 driven by the input shaft 1.

[0073] Further, the end of the centrifugal impeller 6 is also installed on the end of the input shaft 1 through a connecting bolt, further improving the connection stability of the centrifugal impeller 6 and the input shaft 1. Specifically, the end of the input shaft 1 connected with the centrifugal impeller 6 is provided with an internal thread hole in the axial direction of the input shaft 1, and correspondingly, the center of the lower ring piece 604 is provided with an input shaft connecting hole 605 for the connecting bolt to pass through. The hole diameter of the input shaft connecting hole 605 is smaller than the outer diameter of the input shaft 1, the connecting bolt passes through the input shaft connecting hole 605, and the lower ring piece 604 is locked on the lower ring piece 604, thereby increasing the stability of the connection between the two, and without the need to additionally increase the shaft shoulder on the input shaft 1 for axially limiting the centrifugal impeller.

[0074] In the gear box shell 3, in order to seal the opening end of the mounting cavity for mounting the input shaft, the sealing cover plate 9 is arranged opposite to the mounting cavity of the input shaft 1 in the gear box, which is used to seal the opening of the gear box shell 3. After the sealing cover plate 9 is removed, the centrifugal impeller 6 can be disassembled.

[0075] As a further preferred embodiment of any of the above embodiments, the side of the gear box located on one side of the input shaft 1 is also provided with a secondary separator 8, and the exhaust end of the centrifugal impeller 6 is connected with the air inlet end of the secondary separator 8 through an exhaust connecting hole 301. The oil mist flows through the centrifugal impeller 6 and the secondary separator 8 in sequence, and then reaches the oil mist exhaust port 13.

[0076] Specifically, referring to Figure 2 , Figure 8As shown, specifically, the inside of the gear box shell 3 is provided with a mounting cavity for mounting the secondary separator 8; the mounting cavity is arranged in parallel with the mounting cavity for the input shaft 1, and correspondingly, the secondary separator 8 is arranged in parallel with the axis of the centrifugal impeller 6. The two mounting cavities are communicated through the exhaust connection hole 301, and specifically, the exhaust connection hole 301 is perpendicular to the above two mounting cavities, so that the intake and exhaust are more smooth, and the efficiency is increased.

[0077] Regarding the mounting mode of the secondary separator 8, referring to Figure 2 、 Figure 7 As shown, the mounting mode of the secondary separator 8 further includes a gland 10 for limiting the secondary separator 8 in the gear box shell 3, the gland 10 includes a coaxially arranged gland top and a gland bottom; the gland top is fixedly connected with the gland bottom; the gland bottom is a hollow cylinder; the caliber of the gland top is larger than that of the gland bottom, the top of the gland 10 is provided with two shell connection holes 102 arranged symmetrically in the circumferential direction, and a fastener passes through the shell connection hole 102 to fixedly mount the gland 10 on the outer surface of the gear box shell 3, and the end of the gland bottom away from the top thereof is in contact with the secondary separator 8, so as to limit the secondary separator 8 in the gear box shell 3, and the secondary separator 8 can be dismounted by dismounting the gland 10. Specifically, one side of the gland bottom is provided with a gland adjusting port 101 corresponding to the exhaust connection hole 301, the gland adjusting port 101 is in communication with the inner wall of the gland bottom, the end of the gland bottom close to the gland top is a blind end, the gas enters the gland bottom through the gland adjusting port 101, and the other end of the gland bottom away from the gland top is an exhaust end; the gas flows out from the exhaust connection hole 301, and at this point, the gas flow direction is rotated by 90 degrees, and then enters the secondary separator 8. More specifically, the outer diameter of the gland bottom matches the inner diameter of the secondary separator 8 mounting cavity, so that the gland top better seals the mounting cavity of the secondary separator 8.

[0078] In order to further improve the integration of the gear box, the inlet caliber of the gland adjusting port 101 can be adjusted, and the oil mist sequentially passes through the centrifugal impeller 6, the gland adjusting port 101 and the secondary separator 8. Specifically, the caliber of the gland adjusting port 101 is the same as that of the exhaust connection hole 301, and by adjusting the mounting angle of the gland 10 in the circumferential direction, the gland adjusting port 101 is staggered with the exhaust connection hole 301 by a certain angle, so as to reduce the exhaust capacity of the centrifugal impeller 6. When the intake capacity of the centrifugal impeller 6 is unchanged, the exhaust capacity is slightly reduced, so that the gear box is in a slightly negative pressure state, and at the same time, the relative area of the gland adjusting port 101 is reduced, which can accelerate the flow rate of the gas flowing through this place, and the faster the flow rate, the better the separation effect of the subsequent secondary separator 8, so that the oil mist separation is more thorough.

[0079] The shell connecting hole 102 is a waist-shaped hole, so that the mounting position of the fastener in the shell connecting hole 102 can be adjusted along the arc direction, that is, the mounting position of the shell connecting hole 102 relative to the gear box shell 3 can be adjusted along the circumferential direction. By adjusting the mounting position of the shell connecting hole 102 along the circumferential direction, the grommet adjusting port 101 is rotated along the circumferential direction by a small angle, and the grommet adjusting port 101 is deviated from the center axis of the connecting exhaust hole 301 by a small angle, and the deviation angle is preferably 3-6°, so that the adjustment of the opposite area of the grommet adjusting port 101 and the connecting exhaust hole 301 is realized, and then the differential of the gear box air intake and exhaust is controlled.

[0080] After the primary separator 7 and the centrifugal impeller 6, most of the oil mist particles in the oil mist are removed, and only a small part of the oil mist particles escape with the gas. The secondary separator 8 separates the gas containing a small amount of oil mist again, reduces the working load of the secondary separator 8, and prolongs the service life of the secondary separator 8. In order to further improve the efficiency of oil mist separation, the secondary separator 8 is a precision oil separation core. Under the action of the secondary separator 8, the oil mist and the gas are completely separated, and the clean gas is discharged through the oil mist exhaust port 13. The clean gas flows in the internal exhaust pipeline.

[0081] In order to realize the recycling of the oil mist separated by the secondary separator 8, a second connecting oil groove 303 is arranged on the inner wall of the gear box shell 3, and the second connecting oil groove 303 is located below the secondary separator 8 and is in communication with the oil collecting groove of the gear box air inlet 12. The lubricating oil separated by the secondary separator 8 falls under the action of gravity and is collected in the second connecting oil groove 303, and finally flows into the gear box cavity, realizing the recycling of the lubricating oil in the gear box.

[0082] The utility model discloses still provided the integrated dry type oil -free screw host of gear box of containing any one of the above -mentioned implementation mode, reference Figure 9 The oil mist exhaust port 13 of the gear box blows to the gear shaft in the high-pressure machine head 4 and the gear shaft in the low-pressure machine head 5 respectively. Reference Figure 9 The gas flows out through the oil mist exhaust port 13 and is divided into at least two branches, wherein the first branch 401 blows to the gear shaft in the high-pressure machine head 4, and the second branch 501 blows to the gear shaft in the low-pressure machine head 5.

[0083] During the operation of the conventional dry screw compression main machine, the gears inside the gear box will form a large amount of oil mist and generate positive pressure due to the high-speed extrusion and high-speed centrifugal impact and splashing of the lubricating oil film during the work. The oil mist with positive pressure is easy to leak into the screw compression cavity through the sealing structure at the gear shaft of the low-pressure head 4 and the high-pressure head 5. By blowing clean air to the gear shaft of the low-pressure head 4 and the high-pressure head 5, the oil mist on the gear shaft can be blown, the oil mist is prevented from gathering at the gear shaft, the local oil mist is prevented from failing to participate in the oil mist separation, the oil mist circulation is promoted, and the oil mist is further prevented from entering the head from the gear shaft to pollute the compressed air.

[0084] The above describes the utility model and its embodiments in a schematic manner, which is not restrictive, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above, without departing from the creative purpose of the utility model, similar structural modes and embodiments can be designed without creativity, which should all belong to the protection scope of the utility model.

Claims

1. An integrated gearbox for a dry-running oil-free screw main, characterized in that, The gear box comprises a gear box shell (3) and an input shaft (1), the gear transmission group is internally installed in the gear box shell (3), one end of the input shaft (1) is fixedly connected with the output end of a driving mechanism, the other end of the input shaft (1) extends into the interior of the gear box shell (3) and drives the screw rotors in the high-pressure head and the low-pressure head to move through the gear transmission group; the support bearing (11), the primary separator (7) and the centrifugal impeller (6) are all installed in the interior of the gear box shell (3) and are sequentially sleeved on the exterior of the input shaft (1) along the flow direction of the oil mist channel, wherein the centrifugal impeller (6) is fixedly connected with the input shaft (1).

2. The integrated gear box for dry running oil free screw main as claimed in claim 1 wherein, The primary separator (7) comprises a separator outer ring (704) and a separator inner ring (703) which are coaxially arranged, the input shaft (1) is sleeved in the interior of the separator inner ring (703) and a gap exists between the input shaft (1) and the separator inner ring (703); the separator outer ring (704) and the separator inner ring (703) are fixedly connected through a plurality of baffle plates (701) which are parallelly and spacedly arranged, the baffle plates (701) form baffle channels between adjacent baffle plates (701), the separator outer ring (704) is provided with a first oil collecting groove (702) which is in communication with the baffle channels, and the first oil collecting groove (702) is in communication with the oil collecting groove of the gear box air inlet (12).

3. The integrated gear box for dry running oil free screw main as claimed in claim 2 wherein, The baffle plates (701) all comprise a baffle main plate (7011) which extends along the axial direction of the input shaft (1), the baffle main plate (7011) is provided with baffle blocking pieces (7012) which are staggered and spacedly arranged on both sides of the baffle main plate (7011), and the inner side surface of the baffle main plate (7011) and the outer side surface of the baffle blocking pieces (7012) form a V-shaped groove, and the opening degree of the V-shaped groove is 40-60°; The first oil collecting groove (702) comprises a radial oil collecting groove (7021) and a plurality of axial oil collecting grooves (7022) which are parallelly and spacedly arranged and are perpendicular to the radial oil collecting groove (7021), the axial oil collecting grooves (7022) extend along the axial direction of the input shaft (1) and penetrate through the separator outer ring (704) and are in communication with the baffle channels, and the radial oil collecting groove (7021) extends along the circumferential direction of the separator outer ring (704) and is in communication with the plurality of axial oil collecting grooves (7022).

4. The integrated gear box for dry vapo(u)r lubricated screw host machine as claimed in any one of the claims 1 to 3, wherein, One end of the primary separator (7) is in contact with the outer ring of the support bearing (11), and the other end of the primary separator (7) and the support bearing (11) are axially fixed through a blocking ring; At least two limiting blocks (705) are further arranged on the outer side of the primary separator (7) and are spacedly arranged along the circumferential direction of the primary separator (7), and the limiting blocks (705) are installed in the oil collecting groove of the gear box air inlet (12).

5. The integrated gear box for dry vapo(u)r-free screw main as claimed in any one of claims 1 to 3, wherein, The centrifugal impeller (6) comprises an impeller inner ring (603) and an upper ring blade (601) coaxially arranged, the input shaft (1) is sleeved inside the impeller inner ring (603) and fixedly connected with the impeller inner ring (603); one end of the impeller inner ring (603) extends radially to form a lower ring blade (604); the upper ring blade (601) is located at the other end of the impeller inner ring (603) and forms an annular impeller air inlet groove between the two; a plurality of impeller blades (602) are arranged between the lower ring blade (604) and the upper ring blade (601) and are distributed in a ring shape at intervals.

6. The integrated gear box for dry running oil free screw main as claimed in claim 5 wherein, The inside of the gear box is further provided with a secondary separator (8) on one side of the input shaft (1), and the exhaust end of the centrifugal impeller (6) is connected in communication with the air inlet end of the secondary separator (8) through an exhaust connecting hole (301).

7. The integrated gear box for dry running oil free screw main as claimed in claim 6 wherein, Further comprising a gland (10) for limiting the secondary separator (8) inside the gear box shell (3), one side of the bottom of the gland is provided with a gland adjusting port (101) corresponding to the exhaust connecting hole (301), wherein the caliber of the gland adjusting port (101) opposite to the exhaust connecting hole (301) can be adjusted.

8. The integrated gear box for dry running oil free screw main as claimed in claim 7 wherein, The top of the gland is provided with two shell connecting holes (102) arranged symmetrically in the circumferential direction, and the shell connecting holes (102) are waist-shaped holes.

9. The integrated gear box for dry running oil free screw main as claimed in claim 5 wherein, The oil collecting groove of the secondary separator (8) is communicated with the oil collecting groove of the gear box air inlet; And / or the secondary separator (8) is a precision oil separation core.

10. An integrated dry-running oil-free screw main, characterized by Comprise a high-pressure head (4), a low-pressure head (5) and the gear box of any one of claims 1-9.

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