A single drive two-stage dry oil-free screw compressor

Abstract

The application discloses a single-machine-driven two-stage dry oil-free screw compressor, which comprises a compressor body and a cooler; the compressor body is fixed on the upper end of the cooler; the compressor body comprises a first-stage compression mechanism, a compression motor, a second-stage compression mechanism, a first-stage exhaust pipe and a second-stage exhaust pipe; the compression motor is located between the first-stage compression mechanism and the second-stage compression mechanism and synchronously drives the first-stage compression mechanism and the second-stage compression mechanism; the first-stage exhaust pipe is connected with an exhaust end of the first-stage compression mechanism and an air inlet end of the cooler; and the second-stage exhaust pipe is connected with an air outlet end of the cooler and an air inlet end of the second-stage compression mechanism. The application utilizes vertical space and reduces the floor area.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of screw compressors, in particular to a single-machine-driven two-stage dry oil-free screw compressor. BACKGROUND

[0002] The screw compressor is a kind of positive displacement rotary compressor, which realizes the compression of gas through the rotation of two intermeshing helical rotors (male rotor and female rotor) in the casing. The dry oil-free screw compressor is a form of screw compressor, which is completely free of oil during the compression process to ensure the purity of the output gas.

[0003] The screw compressor generally has a multi-stage compression mechanism, and a cooler is arranged between the multi-stage compression mechanisms to improve the compression efficiency, reduce the energy consumption and protect the equipment. However, the cooler and the compressor are independent devices, and are arranged separately during layout, which makes the entire compression system have a large floor area and increases the cost of the work site. Meanwhile, a long pipeline is needed as a gas guide pipe between the cooler and the compressor, and the pressure will drop due to the frictional resistance of the pipeline during the gas conveying process, which is not conducive to air compression and also causes the gas to heat up. SUMMARY

[0004] In order to overcome the deficiencies in the prior art, the present application provides a single-machine-driven two-stage dry oil-free screw compressor, which has the advantage of reducing the floor area.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A single-machine-driven two-stage dry oil-free screw compressor, comprising a compressor body and a cooler; the compressor body is fixed on the upper end of the cooler; the compressor body comprises a first-stage compression mechanism, a compression motor, a second-stage compression mechanism, a first-stage exhaust pipe and a second-stage exhaust pipe; the compression motor is located between the first-stage compression mechanism and the second-stage compression mechanism and synchronously drives the first-stage compression mechanism and the second-stage compression mechanism; the first-stage exhaust pipe connects the exhaust end of the first-stage compression mechanism and the gas inlet end of the cooler; the second-stage exhaust pipe connects the gas outlet end of the cooler and the gas inlet end of the second-stage compression mechanism.

[0007] By adopting the technical scheme, the compressor body is fixed on the upper end of the cooler to complete the integration of the two, so that the vertical space is utilized and the floor area is reduced, and meanwhile, since the compressor body is located above the cooler, the lengths of the first-stage exhaust pipe and the second-stage exhaust pipe can be shortened, the influence of the pipes on the gas is reduced, and the gas compression is facilitated, and meanwhile, the compression motor is located between the first-stage compression mechanism and the second-stage compression mechanism, so that the exhaust end of the first-stage compression mechanism is as close as possible to the gas inlet end of the cooler, and the gas inlet end of the second-stage compression mechanism is as close as possible to the gas outlet end of the cooler, so that the lengths of the first-stage exhaust pipe and the second-stage exhaust pipe can be shortened, the influence of the pipes on the gas is reduced, and the gas compression is facilitated; in addition, the first-stage compression and the second-stage compression are both driven by the compression motor, the number of motors is reduced, the cost is reduced, the control complexity is reduced since the multiple motors do not need to be coordinated, and in addition, the overall structure of the compressor body is more compact.

[0008] Optionally, the exhaust end of the first-stage compression mechanism is located on the side, away from the compression motor, of the gas inlet end thereof; and the gas inlet end of the second-stage compression mechanism is located on the side, away from the compression motor, of the gas outlet end thereof.

[0009] By adopting the technical scheme, the lengths of the first-stage exhaust pipe and the second-stage exhaust pipe can be further shortened, the influence of the pipes on the gas is reduced, and the gas compression is facilitated; in addition, in the case that the lengths of the first-stage exhaust pipe and the second-stage exhaust pipe are unchanged, the length of the cooler can be set to be larger, and the cooling effect of the cooler is better, so that the initial temperature of the second-stage compression is reduced, and the energy consumption of the second-stage compression is lower.

[0010] Optionally, the first-stage compression mechanism comprises a first-stage male rotor and a first-stage female rotor; the perpendicular line connecting the center axes of the first-stage male rotor and the first-stage female rotor forms a 45-degree angle with the gas inlet direction and the gas outlet direction of the first-stage compression mechanism respectively; the second-stage compression mechanism comprises a second-stage male rotor and a second-stage female rotor; the perpendicular line connecting the center axes of the second-stage male rotor and the second-stage female rotor forms a 45-degree angle with the gas inlet direction and the gas outlet direction of the second-stage compression mechanism respectively.

[0011] By adopting the technical scheme, the exhaust end of the first-stage compression mechanism and the gas inlet end of the second-stage compression mechanism can be arranged on the side, and the exhaust pipe does not need to be arranged between the compressor body and the cooler, so that the subsequent installation of the exhaust pipe is facilitated, and in addition, the height of the compressor body is reduced, so that the risk of tipping is reduced.

[0012] Optionally, the first-stage exhaust pipe and the second-stage exhaust pipe are straight pipes arranged vertically.

[0013] By adopting the technical scheme, the first-stage exhaust pipe and the second-stage exhaust pipe are straight pipes arranged vertically, so that the frictional influence caused by the bending of the pipes is reduced, and the gas compression is facilitated.

[0014] Optionally, the end of the cooler is provided with a gas-liquid separation mechanism; the gas-liquid separation mechanism comprises a gas-liquid separation pipe and a gas-liquid separation assembly arranged in the gas-liquid separation pipe; the gas-liquid separation assembly comprises a plurality of inclined blades which are uniformly distributed in the circumferential direction of the center line of the gas-liquid separation pipe; a gas channel is formed between adjacent inclined blades; and adjacent inclined blades partially overlap when projected on the vertical plane of the gas-liquid separation pipe.

[0015] By adopting the above technical scheme, the gas temperature after being cooled by the cooler is reduced to generate liquid, so that the gas is mixed with the liquid; when the gas flow flows along the gas channel, the gas flow contacts the inclined blades, so that the liquid mixed in the gas is retained on the inclined blades to realize gas-liquid separation; since adjacent inclined blades partially overlap when projected on the vertical plane of the gas-liquid separation pipe, no gap channel parallel to the axial direction of the gas-liquid separation pipe is formed between adjacent inclined blades, so that the gas mixed with the liquid must contact the inclined blades, thereby improving the efficiency of gas-liquid separation.

[0016] Optionally, the primary compression mechanism comprises an axial force balancing assembly arranged at the end of the primary compression mechanism; the axial force balancing assembly provides magnetic force to balance the axial force of the male rotor and / or the female rotor of the primary compression mechanism.

[0017] By adopting the above technical scheme, the primary compression mechanism compresses air with the rotation of the male rotor and the female rotor; the male rotor and the female rotor are subjected to axial force from the end towards the front end, which may damage the bearing supporting the male rotor and the female rotor; at this time, the magnetic force provided by the axial force balancing assembly balances the above-mentioned axial force of the male rotor and / or the female rotor of the primary compression mechanism, so that the male rotor and the female rotor work more stably, and the possibility of damaging the bearing supporting the male rotor and the female rotor is reduced, thereby improving the working life of the bearing.

[0018] Optionally, a circular ring-shaped motor cooling cavity coaxially arranged is arranged in the housing of the compression motor; a first cooling liquid inlet pipe is connected to the top of the compression motor, and a first cooling liquid outlet pipe is connected to the bottom of the compression motor; the other end of the first cooling liquid inlet pipe is connected to an external cooling liquid supply device; the other end of the first cooling liquid outlet pipe is in communication with the cooling chamber of the cooler; and a first electromagnetic valve is arranged on the first cooling liquid outlet pipe.

[0019] By adopting the technical scheme, the first electromagnetic valve is opened, the cooling liquid supply device provides cooling liquid, the cooling liquid enters the motor cooling cavity along the first cooling liquid inlet pipe, then flows from top to bottom along the motor cooling cavity, and then enters the cooler along the first cooling liquid outlet pipe, since the position where the cooling liquid enters the motor cooling cavity is higher than the position where the cooling liquid flows out of the motor cooling cavity, no additional driving member is needed to drive, in addition, the temperature of the cooling liquid flowing in from the outside is relatively low, so the cooling effect on the compression motor is good, and the temperature of the cooling liquid flowing out of the compression motor is lower than the temperature of the cooling liquid in the cooler, so this part of the cooling liquid can be used for the cooler without circulating treatment.

[0020] Optionally, the inner circumferential surface of the motor cooling cavity is provided with a plurality of coaxially arranged annular first fins distributed along the axial direction.

[0021] By adopting the technical scheme, the first fin increases the contact area with the cooling liquid, improves the heat exchange efficiency, and the first fin is coaxially arranged with the motor cooling cavity, so as not to hinder the flow of the cooling liquid.

[0022] Optionally, a cooling mechanism is arranged between the compression motor and the cooler; a coaxially arranged annular motor cooling cavity is arranged in the shell of the compression motor; and the cooling mechanism is used to drive the cooling liquid in the cooler to flow through the motor cooling cavity.

[0023] By adopting the technical scheme, the cooling mechanism drives the cooling liquid in the cooler to flow through the motor cooling cavity, so that the compression motor is cooled by the cooling liquid in the cooler, without the need for an additional cooling liquid supply device.

[0024] Optionally, the cooling mechanism drives the cooling liquid to flow alternately along the axial direction of the motor cooling cavity.

[0025] By adopting the technical scheme, the temperature of the cooling liquid just entering the motor cooling cavity is lower than the temperature of the cooling liquid leaving the motor cooling cavity, the cooling mechanism changes the flow direction of the cooling liquid entering the motor cooling cavity, i.e. the cooling liquid flows alternately along the axial direction in the positive direction and in the reverse direction, so that the axial ends of the motor cooling cavity have the opportunity to contact the cooling liquid just entering the motor cooling cavity, thereby improving the cooling uniformity and reducing the possibility of temperature concentration in a certain place. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of embodiment one of the application.

[0027] Figure 2 is a structural schematic view of embodiment one of the application.

[0028] Figure 3 is a structural schematic view of the double-stage male rotor and female rotor of the application.

[0029] Figure 4 is the front view structural schematic diagram of the hidden primary compression end cover rear secondary compression mechanism side of the present application.

[0030] Figure 5 is the top view structural schematic diagram of the first embodiment of the present application.

[0031] Figure 6 is the front view structural schematic diagram of the second embodiment of the present application. Figure 5 is the sectional view structural schematic diagram of A-A in the present application.

[0032] Figure 7 is the structural schematic diagram of the cooler end cover of the present application.

[0033] Figure 8 is the exploded structural schematic diagram of the gas-liquid separation assembly of the present application.

[0034] Figure 9 is the sectional view structural schematic diagram of B in the present application. Figure 6

[0035] Figure 10 is the sectional view structural schematic diagram of the second embodiment of the present application.

[0036] Figure 11 is the sectional view structural schematic diagram of C in the present application. Figure 10

[0037] Figure 12 is the sectional view structural schematic diagram of the third embodiment of the present application.

[0038] Figure 13 is the sectional view structural schematic diagram of D in the present application. Figure 12

[0039] BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 10, primary compression mechanism; 101, primary air inlet; 102, primary exhaust port; 11, primary compression support frame; 12, primary compression seat; 13, primary compression end cover; 14, primary male rotor; 141, primary first driven gear; 142, primary second driving gear; 15, primary female rotor; 151, primary second driven gear; 16, magnetic member mounting seat; 17, magnetic member;

[0041] 20, compression motor; 200, motor cooling cavity; 201, first fin; 202, first cooling cavity; 203, support partition ring; 204, second cooling cavity; 205, intermediate connecting hole; 206, second fin; 21, distributor; 22, first cooling liquid inlet pipe; 23, upper outlet pipe; 24, primary first driving gear; 25, secondary first driving gear; ​​​

[0042] 30, secondary compression mechanism; 301, secondary air inlet; 302, secondary air outlet; 31, secondary compression support frame; 32, secondary compression; 33, secondary compression end cover; 34, secondary male rotor; 341, secondary first driven gear; 342, secondary second driving gear; 35, secondary female rotor; 351, secondary second driven gear;

[0043] 40, primary air outlet pipe;

[0044] 50, cooler; 51, cooling shell; 510, cooling chamber; 511, air inlet cavity; 52, cooler end cover; 53, cooler end cap; 531, end cap connecting plate; 532, inner lining ring column; 5320, radial perforation; 533, abutting ring; 54, cooling mechanism; 541, side support plate; 542, heat exchange air pipe; 543, heat exchange fin plate; 55, gas-liquid separation mechanism; 551, gas-liquid separation pipe; 552, connecting fixed ring; 553, gas-liquid separation assembly; 5531, intermediate support rod; 5532, radial connecting plate; 5533, inclined blade; 56, wind gathering cap; 561, wind gathering cap flange; 562, wind gathering cap body; 5620, air outlet gap; 57, lower liquid outlet pipe; 570, connecting slot; 571, first electromagnetic valve;

[0045] 60, secondary air outlet pipe;

[0046] 80, cooling mechanism; 81, horizontal driving component; 82, cooling liquid intermediate distribution component; 821, intermediate distribution seat; 822, piston plate; 823, horizontal pull rod; 824, driving plate; 83, horizontal pipeline; 84, third pipeline; 841, third upper control electromagnetic valve; 842, third lower control electromagnetic valve; 85, fourth pipeline; 851, fourth control electromagnetic valve; 86, second pipeline; 861, second upper control electromagnetic valve; 862, second lower control electromagnetic valve; 87, first pipeline; 871, first control electromagnetic valve. DETAILED DESCRIPTION

[0047] The following will be described in detail with reference to the accompanying drawings Figures 1-13 The application will be further described in detail.

[0048] Example one: disclose a single machine driven two-stage dry oil-free screw compressor, refer to Figure 1 and Figure 2, including the compressor body and the cooler 50; the compressor body is fixed on the upper end of the cooler 50; the compressor body includes the primary compression mechanism 10, the compression motor 20, the secondary compression mechanism 30, the primary exhaust pipe 40 and the secondary exhaust pipe 60; the compression motor 20 is located between the primary compression mechanism 10 and the secondary compression mechanism 30 and synchronously drives the primary compression mechanism 10 and the secondary compression mechanism 30; the primary exhaust pipe 40 connects the exhaust end of the primary compression mechanism 10 and the gas inlet end of the cooler 50; the secondary exhaust pipe 60 connects the gas outlet end of the cooler 50 and the gas inlet end of the secondary compression mechanism 30; during operation, the gas enters from the gas inlet end of the primary compression mechanism 10, sequentially flows through the primary compression mechanism 10, the primary exhaust pipe 40, the cooler 50, the secondary exhaust pipe 60 and the secondary compression mechanism 30, and finally exits from the exhaust end of the secondary compression mechanism 30, during which the gas completes the first compression, cooling and the second compression in sequence.

[0049] With reference to Figures 1-3 The primary compression mechanism 10 includes the primary compression support frame 11, the primary compression seat 12, the primary compression end cover 13, the primary male rotor 14 and the primary female rotor 15; the primary compression support frame 11, the primary compression seat 12 and the primary compression end cover 13 are connected in sequence by bolts; the primary compression seat 12 is provided with a compression cavity; the primary male rotor 14 and the primary female rotor 15 are arranged in parallel and horizontally penetrate the primary compression seat 12 and the primary compression support frame 11; wherein the screw part of the primary male rotor 14 and the primary female rotor 15 is located in the compression cavity of the primary compression seat 12; the primary compression seat 12 is provided with a primary gas inlet 101 and a primary exhaust port 102; the primary gas inlet 101 and the primary exhaust port 102 are respectively communicated with the compression cavity of the primary compression seat 12; the primary male rotor 14 and the primary female rotor 15 are rotatably connected with the primary compression seat 12 and the primary compression support frame 11 through bearings; the end of the primary male rotor 14 away from the compression motor 20 is coaxially fixed with a primary second driving gear 142; the end of the primary female rotor 15 away from the compression motor 20 is coaxially fixed with a primary second driven gear 151; the primary second driving gear 142 and the primary second driven gear 151 are meshed with each other and located in the primary compression end cover 13. The bottom of the primary compression support frame 11 is provided with support feet which are connected with the cooler 50 by bolts.

[0050] With reference to Figures 1-3The secondary compression mechanism 30 comprises a secondary compression support frame 31, a secondary compression seat 32, a secondary compression end cover 33, a secondary male rotor 34 and a secondary female rotor 35. The secondary compression support frame 31, the secondary compression seat 32 and the secondary compression end cover 33 are sequentially connected into one body by bolts. The secondary compression seat 32 is provided with a compression cavity. The secondary male rotor 34 and the secondary female rotor 35 are arranged in parallel and horizontally penetrate through the secondary compression seat 32 and the secondary compression support frame 31. The screw part of the primary male rotor 14 and the primary female rotor 15 is located in the compression cavity of the secondary compression seat 32. The secondary compression seat 32 is provided with a secondary air inlet 301 and a secondary air outlet 302. The secondary air inlet 301 and the secondary air outlet 302 are respectively communicated with the compression cavity of the secondary compression seat 32. The secondary male rotor 34 and the secondary female rotor 35 are rotatably connected with the secondary compression seat 32 and the secondary compression support frame 31 by bearings. The end of the secondary male rotor 34 away from the compression motor 20 is coaxially fixed with a secondary second driving gear 342. The end of the secondary female rotor 35 away from the compression motor 20 is coaxially fixed with a secondary second driven gear 351. The secondary second driving gear 342 and the secondary second driven gear 351 are meshed with each other and located in the secondary compression end cover 33. The bottom of the secondary compression support frame 31 is provided with a support leg which is connected with the cooler 50 by bolts.

[0051] With reference to Figure 1 and Figure 2 In order to shorten the lengths of the primary exhaust pipe 40 and the secondary exhaust pipe 60, the air outlet end of the primary compression mechanism 10 is located on the side away from the compression motor 20 of the air inlet end, i.e. the primary air outlet 102 is located on the side away from the compression motor 20 of the primary air inlet 101. The air inlet end of the secondary compression mechanism 30 is located on the side away from the compression motor 20 of the air outlet end, i.e. the secondary air inlet 301 is located on the side away from the compression motor 20 of the secondary air outlet 302. In this way, the primary air outlet 102 is closer to the air inlet end of the cooler 50 and the secondary air inlet 301 is closer to the air outlet end of the cooler 50, so as to shorten the lengths of the primary exhaust pipe 40 and the secondary exhaust pipe 60 while ensuring that the cooler 50 is as long as possible.

[0052] With reference to Figure 3 The compression motor 20 is a coaxial double-input motor. One end of the output shaft of the compression motor 20 is coaxially fixed with the primary first driving gear 24 and the other end is coaxially fixed with the secondary first driving gear 25. The other end of the primary male rotor 14 is coaxially fixed with a primary first driven gear 141. The primary first driven gear 141 is meshed with the primary first driving gear 24. The other end of the secondary male rotor 34 is coaxially fixed with a secondary first driven gear 341. The secondary first driven gear 341 is meshed with the secondary first driving gear 25.

[0053] With reference to Figure 1 , Figure 2 andFigure 4 , in order to facilitate the installation of the primary exhaust pipe 40 and the secondary exhaust pipe 60, the primary exhaust pipe 40 and the secondary exhaust pipe 60 are arranged at the side, wherein the primary air inlet 101 is located at the top of the primary compression seat 12, and the primary air outlet 102 is located at the side of the primary compression seat 12; the central vertical lines of the rotation shafts of the primary male rotor 14 and the primary female rotor 15 are respectively at a 45-degree angle with the air inlet direction and the air outlet direction of the primary compression mechanism 10; the secondary air inlet 301 is located at the side of the secondary compression seat 32, and the secondary air outlet 302 is located at the top of the secondary compression seat 32; the secondary compression mechanism 30 comprises a secondary male rotor 34 and a secondary female rotor 35; the central vertical lines of the rotation shafts of the secondary male rotor 34 and the secondary female rotor 35 are respectively at a 45-degree angle with the air inlet direction and the air outlet direction of the secondary compression mechanism 30. One end of the primary exhaust pipe 40 is connected with the primary air outlet 102, and the other end is connected with the air inlet end of the cooler 50; one end of the secondary exhaust pipe 60 is connected with the secondary air inlet 301, and the other end is connected with the air outlet end of the cooler 50.

[0054] In other embodiments, the primary air inlet 101 and the primary air outlet 102 are in the same vertical direction, at which time the rotation shafts of the primary male rotor 14 and the primary female rotor 15 are in the same horizontal plane; the secondary air inlet 301 and the secondary air outlet 302 are in the same vertical direction, at which time the rotation shafts of the secondary male rotor 34 and the secondary female rotor 35 are in the same horizontal plane; in this way, the primary exhaust pipe 40 and the secondary exhaust pipe 60 can be arranged as straight pipes arranged vertically, which, compared with the bending mode of the primary exhaust pipe 40 and the secondary exhaust pipe 60 in the first embodiment, reduces the frictional influence caused by pipe bending and is conducive to gas compression. However, in order to facilitate installation, the position of the compressor body in this embodiment is higher than that in the first embodiment, which increases the risk of tipping.

[0055] Reference Figure 6 The cooler 50 comprises a cylindrical cooling shell 51 arranged with two open ends, a cooler end cover 53, a cooler end cover 52, a cooling mechanism 54 and a gas-liquid separation mechanism 55; the cooler end cover 53 and the cooler end cover 52 are respectively fixed on both ends of the cooling shell 51 by bolts, and the cooler end cover 53 is located on the side close to the primary compression mechanism 10; the cooler end cover 52 is located on the side close to the secondary compression mechanism 30; the cooling shell 51 forms an air inlet cavity 511 at the end close to the primary compression mechanism 10 and a cooling chamber 510 at the end away from the primary compression mechanism 10; one end of the primary exhaust pipe 40 is fixed on the cooling shell 51 and communicates with the air inlet cavity; the cooling mechanism 54 is arranged in the cooling chamber 510; an air outlet cavity is formed in the cooler end cover 52; the gas-liquid separation mechanism 55 is arranged at the end of the cooling mechanism 54 and located in the air outlet cavity.

[0056] Reference Figure 6The cooling mechanism 54 includes a pair of circular plate-shaped side support plates 541, a plurality of heat exchange fin plates 543 distributed along the axial direction of the cooling chamber 510, and a plurality of heat exchange air pipes 542 uniformly distributed along the central axis of the cooling chamber 510; all the heat exchange fin plates 543 are located between the pair of side support plates 541; the heat exchange air pipes 542 pass through the pair of side support plates 541 and all the heat exchange fin plates 543 in sequence, and the two ends of the heat exchange air pipes 542 are flush with the end faces of the pair of side support plates 541 away from each other in order to facilitate air intake. During operation, the cooling chamber 510 between the pair of side support plates 541 is partially filled with cooling liquid, and the cooling liquid is circulated and cooled by an external cooling liquid circulating device.

[0057] With reference to Figure 6 and Figure 7 In order to facilitate the installation of the cooling mechanism 54, the diameter of the air intake cavity 511 is greater than that of the cooling chamber 510, and a stepped groove is formed at the connection between the air intake cavity 511 and the cooling chamber 510; the diameter of the side support plate 541 close to the primary compression mechanism 10 is matched with the size of the stepped groove, and the diameter of the side support plate 541 away from the primary compression mechanism 10 is matched with the size of the cooling chamber 510. The cooler end cover 53 includes a circular plate-shaped end cover connecting plate 531, a coaxial circular ring columnar inner lining ring column 532 formed on the end face of the end cover connecting plate 531, and a coaxial circular ring-shaped abutting ring 533 formed on the other end of the inner lining ring column 532; a pair of radial perforations 5320 are formed on the inner lining ring column 532; after installation, the end cover connecting plate 531 closes the opening of the cooling housing 51, the inner lining ring column 532 is located in the air intake cavity 511 and the pair of radial perforations 5320 face the exhaust end of the primary exhaust pipe 40, and the abutting ring 533 abuts against the side support plate 541 close to the primary compression mechanism 10.

[0058] With reference to Figure 6 and Figure 8 The gas-liquid separation mechanism 55 includes a gas-liquid separation pipe 551 and a gas-liquid separation assembly 553 arranged in the gas-liquid separation pipe 551; the gas-liquid separation pipe 551 includes a separation pipe flange and a circular ring columnar separation pipe body; one end of the cooler end cover 52 is formed with a flange connected to the cooling housing 51, and when the gas-liquid separation pipe 551 is installed, the separation pipe body of the gas-liquid separation pipe 551 extends into the exhaust cavity of the cooler end cover 52, and the separation pipe flange is located outside the cooler end cover 52 and is fixed on the flange of the cooler end cover 52 by bolts.

[0059] With reference to Figure 6 and Figure 8, the gas-liquid separation assembly 553 includes a middle support rod 5531 and a plurality of inclined vanes 5533 fixed on one end of the middle support rod 5531 close to the cooling mechanism 54; the middle support rod 5531 is coaxially arranged with the gas-liquid separation pipe 551; the inclined vanes 5533 are uniformly distributed along the circumference of the middle support rod 5531; the gas passages are formed between adjacent inclined vanes 5533; and the adjacent inclined vanes 5533 partially overlap in the projection on the vertical plane of the gas-liquid separation pipe 551. In order to be connected with the gas-liquid separation pipe 551, a circular annular connecting fixing ring 552 is fixed on the end of the separation pipe body of the gas-liquid separation pipe 551 away from the separation pipe flange, and a plurality of circumferentially uniformly distributed radial connecting plates 5532 are formed on one end of the middle support rod 5531 away from the inclined vanes 5533; the outer side end of the radial connecting plate 5532 is fixed on the inner circumferential surface of the connecting fixing ring 552. In order to reduce the wind resistance, the two ends of the middle support rod 5531 are shaped into conical sharp corners.

[0060] Reference Figure 6 and Figure 8 In order to improve the gas gathering and improve the efficiency of the subsequent secondary compression, the gas inlet end of the secondary exhaust pipe 60 is connected with a wind gathering cap 56, the wind gathering cap 56 includes a wind gathering cap flange 561 connected with the secondary exhaust pipe 60 and a wind gathering cap body 562; the wind gathering cap body 562 is composed of a wind gathering cap main body in the shape of a circular annular column and a hemispherical shell fixed on the end away from the wind gathering cap flange 561; and the wind gathering cap body 562 is shaped with an exhaust gap 5620 on one side opposite to the connecting fixing ring 552.

[0061] In other embodiments, reference Figure 6 and Figure 9 In order to balance the axial force of the compressed air applied to the primary male rotor 14 and the primary female rotor 15 when the primary compression mechanism 10 is working, an axial force balancing assembly is arranged in the primary compression end cover 13, the axial force balancing assembly includes a magnetic piece mounting seat 16 and a magnetic piece 17 fixed on the magnetic piece mounting seat 16; the magnetic piece 17 can be an electromagnet; the magnetic force generated by the magnetic piece 17 can act on the primary male rotor 14, the primary female rotor 15 or both the primary male rotor 14 and the primary female rotor 15.

[0062] Embodiment two: the difference between embodiment two and embodiment one is that, reference Figure 10 and Figure 11 The housing of the compression motor 20 is arranged with a coaxially arranged circular annular motor cooling cavity 200; in order to increase the strength of the motor cooling cavity 200, a circular annular support partition ring 203 is formed in the middle of the motor cooling cavity 200, which divides the motor cooling cavity 200 into a first cooling cavity 202 and a second cooling cavity 204 distributed along the axial direction.

[0063] In order to compress the heat dissipation of the motor 20, the top of the compression motor 20 is connected with a plurality of first cooling liquid inlet pipes 22, and the bottom is connected with a plurality of first cooling liquid outlet pipes; the first cooling liquid inlet pipe 22 is communicated with the first cooling cavity 202 or the second cooling cavity 204, and the first cooling liquid outlet pipe is communicated with the first cooling cavity 202 or the second cooling cavity 204; the other end of the first cooling liquid inlet pipe 22 is connected with the external cooling liquid supply device; in order to uniformly distribute the cooling liquid, a distributor 21 is arranged between all the first cooling liquid inlet pipes 22 and the external cooling liquid supply device, and the cooling liquid uniformly flows into the first cooling liquid inlet pipe 22 after passing through the distributor 21, so that the cooling liquid enters the first cooling cavity 202 and the second cooling cavity 204. The other end of the first cooling liquid outlet pipe is communicated with the cooling chamber 510 of the cooler 50; the first electromagnetic valve 571 is arranged on the first cooling liquid outlet pipe.

[0064] Reference Figure 10 And Figure 11 , in order to facilitate disassembly, the first cooling liquid outlet pipe includes an upper outlet pipe 23 fixed on the compression motor 20 and a lower outlet pipe 57 fixed on the cooler 50; the first electromagnetic valve 571 is installed on the lower outlet pipe 57, and the upper end of the lower outlet pipe 57 is formed with a connecting slot 570 for vertically inserting the lower end of the upper outlet pipe 23; a sealing ring is arranged between the lower outlet pipe 57 and the upper outlet pipe 23.

[0065] When the compression motor 20 needs to be cooled, the first electromagnetic valve 571 is opened, and then the external cooling liquid supply device increases the cooling liquid, which enters the cooling chamber 510 in sequence through the first cooling liquid inlet pipe 22, the motor cooling cavity 200 and the first cooling liquid outlet pipe, so as to complete the heat dissipation of the compression motor 20.

[0066] Reference Figure 10 And Figure 11 , in order to improve the heat dissipation efficiency of the compression motor 20, a plurality of coaxially arranged annular first fins 201 are arranged on the inner circumferential surface of the motor cooling cavity 200.

[0067] Example three: the difference between example three and example one is that: reference Figure 12 And Figure 13 , the shell of the compression motor 20 is provided with a coaxially arranged annular motor cooling cavity 200; in order to increase the strength of the motor cooling cavity 200, a circular annular support partition ring 203 is formed in the middle of the motor cooling cavity 200, which divides the motor cooling cavity 200 into a first cooling cavity 202 and a second cooling cavity 204 distributed along the axial direction, and a plurality of intermediate connecting holes 205 are uniformly distributed on the support partition ring 203; the first cooling cavity 202 and the second cooling cavity 204 are communicated through the intermediate connecting holes 205.

[0068] ReferenceFigure 12 and Figure 13 The cooling mechanism 80 is arranged between the compression motor 20 and the cooler 50, and is used to drive the cooling liquid in the cooler 50 to flow through the motor cooling cavity 200, so as to achieve heat dissipation of the compression motor 20.

[0069] With reference to Figure 12 and Figure 13 The cooling mechanism 80 comprises a cooling liquid driving assembly, a first pipeline 87, a second pipeline 86, a third pipeline 84 and a fourth pipeline 85. The upper ends of the first pipeline 87 and the second pipeline 86 are connected with the first cooling cavity 202, and the lower ends thereof are connected with the cooling chamber 510. The upper ends of the third pipeline 84 and the fourth pipeline 85 are connected with the second cooling cavity 204, and the lower ends thereof are connected with the cooling chamber 510. The first pipeline 87 is provided with a first control electromagnetic valve 871. The second pipeline 86 is provided with a second upper control electromagnetic valve 861 and a second lower control electromagnetic valve 862. The third pipeline 84 is provided with a third upper control electromagnetic valve 841 and a third lower control electromagnetic valve 842. The fourth pipeline 85 is provided with a fourth control electromagnetic valve 851.

[0070] With reference to Figure 12 and Figure 13 The cooling liquid driving assembly comprises a cooling liquid intermediate distribution component 82 and a horizontal driving component 81. The cooling liquid intermediate distribution component 82 comprises a hollow cylindrical shell-shaped intermediate distribution seat 821 and a piston plate 822 which axially and sealingly slides along the inner cavity of the intermediate distribution seat 821. Two or four horizontal pull rods 823 are respectively formed on the vertical end faces of the two sides of the piston plate 822. The horizontal pull rods 823 horizontally penetrate and sealingly slide on the vertical side walls of the corresponding sides of the intermediate distribution seat 821. The ends of the horizontal pull rods 823 away from the piston plate 822 are fixed with driving plates 824. The horizontal driving component 81 is fixed on the cooler 50. The horizontal driving component 81 is used to drive the pair of driving plates 824 to synchronously horizontally move. The horizontal driving component 81 can be a double-head air cylinder or other linear driving member. The two vertical side walls of the intermediate distribution seat 821 are respectively fixed with horizontal pipelines 83. The horizontal pipelines 83 are in communication with the inner cavity of the intermediate distribution seat 821. The other end of one of the horizontal pipelines 83 is connected with the third pipeline 84, and the connection point is located between the third upper control electromagnetic valve 841 and the third lower control electromagnetic valve 842. The other end of the other horizontal pipeline 83 is connected with the second pipeline 86, and the connection point is located between the second upper control electromagnetic valve 861 and the second lower control electromagnetic valve 862. The third pipeline 84 and the second pipeline 86 are located between the fourth pipeline 85 and the second pipeline 86. The fourth pipeline 85 is located at the end of the second cooling cavity 204 away from the first cooling cavity 202. The first pipeline 87 is located at the end of the first cooling cavity 202 away from the second cooling cavity 204.

[0071] With reference to Figure 12 andFigure 13 In order to improve the heat dissipation efficiency of the compression motor 20, a plurality of second fins 206 are arranged on the inner circumferential surface of the motor cooling cavity 200 and are uniformly distributed in the circumferential direction; the second fins 206 are thin plates and the length direction thereof is parallel to the axial direction of the motor cooling cavity 200.

[0072] In operation, referring to Figure 13 The third lower control electromagnetic valve 842, the second upper control electromagnetic valve 861 and the fourth control electromagnetic valve 851 are opened, the horizontal driving component 81 drives the piston plate 822 to move to the right, so that the cooling liquid in the inner cavity of the intermediate distribution seat 821 located at the right side of the piston plate 822 flows into the cooler 50 along the right horizontal pipeline 83, the upper portion of the second pipeline 86, the first cooling cavity 202, the intermediate connecting hole 205, the second cooling cavity 204 and the fourth pipeline 85, and at the same time, as the piston plate 822 moves to the right, the cooling liquid in the cooler 50 flows into the inner cavity of the intermediate distribution seat 821 located at the left side of the piston plate 822 along the lower portion of the third pipeline 84 and the left horizontal pipeline 83; then the third lower control electromagnetic valve 842, the second upper control electromagnetic valve 861 and the fourth control electromagnetic valve 851 are closed, the second lower control electromagnetic valve 862, the third upper control electromagnetic valve 841 and the first control electromagnetic valve 871 are opened, the horizontal driving component 81 drives the piston plate 822 to move to the left, so that the cooling liquid in the inner cavity of the intermediate distribution seat 821 located at the left side of the piston plate 822 flows into the cooler 50 along the left horizontal pipeline 83, the upper portion of the third pipeline 84, the second cooling cavity 204, the intermediate connecting hole 205, the first cooling cavity 202 and the first pipeline 87; according to the above principle, the driving of the cooling liquid to flow along the axial direction of the motor cooling cavity 200 in the forward and reverse directions alternately is completed by the left and right movement of the piston plate 822. Since the temperature of the cooling liquid just entering the motor cooling cavity 200 is lower than that of the cooling liquid leaving the motor cooling cavity 200, changing the flow direction of the cooling liquid entering the motor cooling cavity 200, i.e. the cooling liquid flows in the forward and reverse directions along the axial direction alternately, so that both ends of the axial direction of the motor cooling cavity 200 have the opportunity to contact the cooling liquid just entering the motor cooling cavity, thereby improving the cooling uniformity and reducing the possibility of temperature concentration in a certain place.

[0073] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A single motor driven two-stage dry-running oil-free screw compressor comprising a compressor body and a cooler (50); characterized in that: The compressor body is fixed on the upper end of the cooler (50); the compressor body comprises a first-stage compression mechanism (10), a compression motor (20), a second-stage compression mechanism (30), a first-stage exhaust pipe (40) and a second-stage exhaust pipe (60); the compression motor (20) is located between the first-stage compression mechanism (10) and the second-stage compression mechanism (30) and synchronously drives the first-stage compression mechanism (10) and the second-stage compression mechanism (30); the first-stage exhaust pipe (40) is connected with the exhaust end of the first-stage compression mechanism (10) and the air inlet end of the cooler (50); the second-stage exhaust pipe (60) is connected with the air outlet end of the cooler (50) and the air inlet end of the second-stage compression mechanism (30); The air outlet end of the first-stage compression mechanism (10) is located on the side of the air inlet end away from the compression motor (20); the air inlet end of the second-stage compression mechanism (30) is located on the side of the air outlet end away from the compression motor (20); The first-stage exhaust pipe (40) and the second-stage exhaust pipe (60) are located on the same side of the compression motor (20), and the upper end distance of the first-stage exhaust pipe (40) and the second-stage exhaust pipe (60) is less than the lower end distance.

2. A single motor driven two-stage dry-running oil-free screw compressor according to claim 1, characterized in that The first-stage compression mechanism (10) comprises a first-stage male rotor (14) and a first-stage female rotor (15); the central vertical line of the rotation shafts of the first-stage male rotor (14) and the first-stage female rotor (15) respectively forms a 45-degree angle with the air inlet direction and the air outlet direction of the first-stage compression mechanism (10); the second-stage compression mechanism (30) comprises a second-stage male rotor (34) and a second-stage female rotor (35); the central vertical line of the rotation shafts of the second-stage male rotor (34) and the second-stage female rotor (35) respectively forms a 45-degree angle with the air inlet direction and the air outlet direction of the second-stage compression mechanism (30).

3. A single motor driven two-stage dry-running oil-free screw compressor according to claim 1, characterized in that: The end of the cooler (50) is provided with a gas-liquid separation mechanism (55); the gas-liquid separation mechanism (55) comprises a gas-liquid separation pipe (551) and a gas-liquid separation assembly (553) arranged in the gas-liquid separation pipe (551); the gas-liquid separation assembly (553) comprises a plurality of inclined blades (5533) uniformly distributed in the circumferential direction of the center line of the gas-liquid separation pipe (551); the adjacent inclined blades (5533) form a gas channel; the adjacent inclined blades (5533) partially overlap in the projection on the vertical plane of the gas-liquid separation pipe (551).

4. A single motor driven two-stage dry-running oil-free screw compressor according to claim 1, characterized in that: The first-stage compression mechanism (10) comprises an axial force balance assembly located at the end of the first-stage compression mechanism (10); the axial force balance assembly provides a magnetic force to balance the axial force of the male rotor and / or the female rotor of the first-stage compression mechanism (10).

5. A single motor driven two-stage dry-running oil-free screw compressor according to claim 1, characterized in that: The shell of the compression motor (20) is provided with a coaxially arranged annular motor cooling cavity (200); the top of the compression motor (20) is connected with a first cooling liquid inlet pipe (22), and the bottom is connected with a first cooling liquid outlet pipe; the other end of the first cooling liquid inlet pipe (22) is connected with an external cooling liquid supply device; the other end of the first cooling liquid outlet pipe is communicated with a cooling chamber (510) of the cooler (50); a first electromagnetic valve (571) is arranged on the first cooling liquid outlet pipe.

6. A single motor driven two-stage dry-running oil-free screw compressor according to claim 5, characterized in that: The inner circumferential surface of the motor cooling cavity (200) is provided with a plurality of coaxially arranged annular first fins (201) distributed along the axial direction.

7. A single motor driven two-stage dry-running oil-free screw compressor according to claim 1, characterized in that: The cooling mechanism (80) is arranged between the compression motor (20) and the cooler (50); the shell of the compression motor (20) is provided with a coaxially arranged annular motor cooling cavity (200); the cooling mechanism (80) is used for driving the cooling liquid in the cooler (50) to flow through the motor cooling cavity (200).

8. A single motor driven two-stage dry-running oil-free screw compressor according to claim 7, characterized in that: The cooling mechanism (80) drives the cooling liquid to flow along the axial direction of the motor cooling cavity (200) alternately.

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