Single machine dual-stage compressor

Abstract

The application discloses a single-machine double-stage compressor, which comprises a stator and a rotor, both of which are installed in a machine shell, one end of the machine shell is provided with a gas supplementing port, the other end of the machine shell is installed with a first-stage screw compressor and a second-stage screw compressor, a driving gear is sleeved on an output shaft of the rotor, a driven gear is fixed on a power input end of the first-stage screw compressor, the driving gear is engaged with the driven gear, the output shaft of the rotor is fixed with a power input end of the second-stage screw compressor, and the gas outlet end of the first-stage screw compressor and the gas inlet end of the second-stage screw compressor are both communicated with the inside of the machine shell. The motor directly drives the second-stage screw compressor, the motor and the first-stage screw compressor are driven through the gear, the output shaft of the rotor is shortened and the overall rigidity is improved, so that the compressor can normally operate; the gas compressed by the first-stage screw compressor is mixed with the gas entering into the machine shell from the gas supplementing port, and the two gases uniformly and quickly pass through the stator and the rotor, so that the stator and the rotor can be quickly cooled.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressors, more particularly to a single machine two-stage compressor. BACKGROUND

[0002] The existing two-stage compressor on the market is arranged with a motor in the middle, and a first-stage compressor and a second-stage compressor are arranged at both ends of the motor. Air enters from the air inlet of the first-stage compressor, is pumped into the second-stage compressor after being compressed by the first-stage compressor, and is compressed by the second-stage compressor. The arrangement of the above-mentioned two-stage compressor makes the main drive shaft of the motor longer, and the longer the main drive shaft, the more likely it is to deform. Since the male rotor and the female rotor of the compressor are precisely engaged, when the main drive shaft directly connected to the male rotor deforms, it will directly affect the compression performance of the compressor. In addition, the first-stage compressor and the second-stage compressor are directly driven by the main drive shaft, and the air compression amount of the first-stage compressor and the second-stage compressor per unit time is the same. Therefore, when the air is compressed for the second time, air supplement is needed, and the more the air supplement, the worse the effect of the second compression.

[0003] Therefore, how to provide a single machine two-stage compressor that can overcome the above problems is a problem that those skilled in the art need to solve. SUMMARY

[0004] Therefore, the present application provides a single machine two-stage compressor.

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

[0006] A single machine two-stage compressor, comprising a motor, a first-stage screw compressor and a second-stage screw compressor, the motor comprising a stator, a rotor and a casing, the stator and the rotor being installed in the casing, one end of the casing being provided with an air supplement opening in communication with the outside atmosphere, the other end of the casing being provided with the first-stage screw compressor and the second-stage screw compressor, a driving gear being sleeved on the output shaft of the rotor, a driven gear being fixed on the power input end of the first-stage screw compressor, the driving gear being engaged with the driven gear, the output shaft of the rotor being coaxially fixed with the power input end of the second-stage screw compressor, the air outlet end of the first-stage screw compressor and the air inlet end of the second-stage screw compressor being in communication with the inside of the casing.

[0007] Compared with the prior art, the single-machine double-stage compressor provided by the application has the following advantages: the one-stage screw compressor and the two-stage screw compressor are installed on one side of the casing, the motor directly drives the two-stage screw compressor, the motor and the one-stage screw compressor are driven through the gear transmission, the output shaft of the rotor is shortened to improve the overall rigidity of the output shaft of the rotor and ensure that the compressor can operate normally, the air supply opening is arranged to supply air into the casing in time, the air compressed by the one-stage screw compressor is mixed with the air entering the casing from the air supply opening, and the two kinds of air quickly pass through the stator and the rotor to quickly cool the stator and the rotor, the compressed air discharged from the one-stage screw compressor has a certain amount of heat, the heat is superimposed with the heat generated by the stator and the rotor to increase the intake heat of the two-stage screw compressor, and thus the overall compression effect of the compressor is improved.

[0008] Preferably, the inner wall of the casing is integrally formed with a gas passage, the gas outlet end of the one-stage screw compressor is communicated with the gas passage, the inner wall of the casing is provided with an air outlet communicated with the gas passage, and the air outlet is arranged close to one end of the air supply opening arranged on the casing. The air outlet and the air supply opening are arranged on the same side of the casing and both are away from the end cover 1, the air compressed by the one-stage screw compressor is mixed with the air entering the casing from the air supply opening, and the two kinds of air uniformly and quickly pass through the stator and the rotor to quickly cool the stator and the rotor.

[0009] Preferably, the number of teeth of the driving gear is greater than the number of teeth of the driven gear. The arrangement makes the compressed air amount of the one-stage screw compressor greater than the compressed air amount of the two-stage screw compressor per unit time, the two-stage screw compressor can obtain sufficient and high-density compressed air when the air is inhaled, and thus the compression capacity of the entire compressor is improved.

[0010] Preferably, the first-stage screw compressor comprises a male rotor one and a female rotor one, the second-stage screw compressor comprises a male rotor two and a female rotor two, the casing is open at an end away from the air supplementing port, the end cap one is sealed at the open end of the casing, one end of the machine body is fixed with the end cap one away from the casing, the end cap two is fixed with the machine body away from the end cap one, the machine body is provided with a rotor cavity one and a rotor cavity two penetrating through both ends thereof, the male rotor one and the female rotor one are limited in the rotor cavity one, the male rotor one and the female rotor one are rotationally connected with the end cap one and the end cap two, the male rotor one is coaxially fixed with the driven gear, the male rotor two and the female rotor two are limited in the rotor cavity two, the male rotor two and the female rotor two are rotationally connected with the end cap one and the end cap two, the male rotor two is coaxially fixed with the rotor output shaft, the end cap one is provided with an exhaust passage penetrating through an end wall thereof and a through hole, one end of the exhaust passage is communicated with an exhaust side of the rotor cavity one, the other end of the exhaust passage is communicated with the gas passage, the intake side of the rotor cavity two is communicated with the inside of the casing through the through hole, the end cap two is provided with an air inlet and an air outlet, the air inlet is communicated with the intake side of the rotor cavity one, and the air outlet is communicated with the exhaust side of the rotor cavity two. The arrangement ensures that the first-stage screw compressor and the second-stage screw compressor can be reliably installed at the open end of the casing, and the first-stage screw compressor and the second-stage screw compressor can effectively compress the gas.

[0011] Preferably, the axial center line of the male rotor one and the axial center line of the female rotor one define a plane, and the axial center line of the male rotor two and the axial center line of the female rotor two define a plane perpendicular to the plane. The arrangement can reduce the volume of the compressor and make the structure of the compressor compact.

[0012] Preferably, the machine body is integrally formed with an oil storage cavity and an oil channel communicated with the oil storage cavity, the machine body is provided with an oil hole one and an oil hole two penetrating through the rotor cavity one and the rotor cavity two respectively, the rotor cavity one is communicated with the oil channel through the oil hole one, the rotor cavity two is communicated with the oil channel through the oil hole two, the oil storage cavity is sealed at an opening thereof with a cover body, a cylindrical filter element is installed in the oil storage cavity, and oil in the oil storage cavity flows into the oil channel after flowing through the cylindrical filter element. The arrangement can effectively lubricate the male rotor one and the female rotor one and the male rotor two and the female rotor two, and improve the sealing of the male rotor one and the female rotor one with the rotor cavity one and the sealing of the male rotor two and the female rotor two with the rotor cavity two respectively. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim at the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0014] Figure 1 It is a whole shaft view of a single machine double-stage compressor Figure 1 ;

[0015] Figure 2 It is a whole shaft view of a single machine double-stage compressor Figure 2 ;

[0016] Figure 3 It is a side view of a single machine double-stage compressor

[0017] Figure 4 It is a sectional view in A-A direction of Figure 3 ;

[0018] Figure 5 It is a shaft view of end cover one in a single machine double-stage compressor

[0019] Figure 6 It is a shaft view of machine body in a single machine double-stage compressor

[0020] Figure 7 It is a shaft view of end cover two in a single machine double-stage compressor

[0021] Figure 8 It is a shaft view of machine shell in a single machine double-stage compressor

[0022] Figure 9 It is a partial shaft view of a single machine double-stage compressor Figure 1 ;

[0023] Figure 10 It is a partial shaft view of a single machine double-stage compressor Figure 2 ;

[0024] Figure 11 It is a partial shaft view of a single machine double-stage compressor Figure 3 ;

[0025] Figure 12 It is a partial shaft view of a single machine double-stage compressor Figure 4 .

[0026] In the drawings:

[0027] 1 is a stator, 2 is a rotor, 3 is a casing, 30 is a gas supplementing port, 31 is a gas passage, 32 is a gas outlet, 4 is a male rotor one, 5 is a female rotor one, 6 is a male rotor two, 7 is a female rotor two, 8 is a driving gear, 9 is a driven gear, 10 is an end cover one, 100 is an exhaust passage, 101 is a through hole, 11 is a machine body, 110 is a rotor cavity one, 111 is a rotor cavity two, 112 is an oil storage cavity, 113 is an oil hole one, 114 is an oil hole two, 12 is an end cover two, 120 is an air inlet, 121 is an exhaust port, 122 is a gas channel, 123 is a mounting cavity, 13 is a cover body, and 14 is a baffle. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0029] The present application discloses a single machine double-stage compressor. The single machine double-stage compressor comprises a motor, a first-stage screw compressor and a second-stage screw compressor, wherein the motor directly drives the second-stage screw compressor, and the motor and the first-stage screw compressor are connected through a gear transmission. The output shaft of the rotor is shortened, so that the overall rigidity of the output shaft of the rotor is improved, and the compressor can operate normally. The number of teeth of the driving gear is greater than that of the driven gear. The compressed gas amount of the first-stage screw compressor is greater than that of the second-stage screw compressor in unit time. The second-stage screw compressor can obtain sufficient and high-density compressed gas when the gas is inhaled, so that the compression capacity of the whole compressor is improved. The gas supplementing port is arranged, so that the gas in the casing can be supplemented in time. The gas passage and the gas outlet are arranged. The gas outlet and the gas supplementing port are arranged on the same side of the casing and are away from the end cover one. The gas compressed by the first-stage screw compressor and the gas entering the casing from the gas supplementing port are mixed. The two kinds of gas pass through the stator and the rotor uniformly and quickly, so that the stator and the rotor can be cooled quickly. The compressed air discharged from the first-stage screw compressor has a certain heat. The heat is superimposed with the heat generated by the stator and the rotor, so that the heat of the gas inhaled by the second-stage screw compressor is improved, and the overall compression effect of the compressor is improved.

[0030] EMBODIMENT

[0031] Referring to the overall and partial structural schematic diagram of an embodiment of the present application, Figures 1-12 The present application specifically discloses a single machine double-stage compressor, which comprises a motor, a first-stage screw compressor and a second-stage screw compressor,

[0032] The motor comprises a stator 1, a rotor 2 and a casing 3, the stator 1 is fixed with the inner side wall of the casing 3, the rotor 2 is coaxially arranged inside the stator 1, the axis line of the rotor 2 is parallel to the length direction of the casing 3, one end of the casing 3 is provided with a gas supplement port 30 which is communicated with the outside air, the other end of the casing 3 is provided with a primary screw compressor and a secondary screw compressor, the output shaft of the rotor 2 is coaxially provided with a driving gear 8, the power input end of the primary screw compressor is coaxially fixed with a driven gear 9, the driving gear 8 is engaged with the driven gear 9, the driving gear 8 and the driven gear 9 in the embodiment are both helical gears, the output shaft of the rotor 2 is coaxially fixed with the power input end of the secondary screw compressor, the gas outlet end of the primary screw compressor and the gas inlet end of the secondary screw compressor are both communicated with the inside of the casing 3, the outside air is compressed by the primary screw compressor and then enters into the casing 3, then the secondary screw compressor extracts the gas in the casing 3 for secondary compression, the gas supplement port 30 can supplement the gas in the casing 3, there are two ways for the gas supplement, one is that the outside air is sucked into the casing 3 due to the fast air flow speed and low pressure in the casing 3, the other is that the gas pump is connected with the gas supplement port 30 to forcibly pump the air into the casing 3.

[0033] Further specifically, the gas passage 31 is integrally formed on the inner wall of the casing 3, the gas outlet end of the primary screw compressor is communicated with the gas passage 31, the gas outlet port 32 which is communicated with the gas passage 31 is arranged on the inner side wall of the casing 3, the gas outlet port 32 is arranged close to the one end of the casing 3 which is provided with the gas supplement port 30. The gas compressed by the primary screw compressor enters into the inside of the casing 3 from the one end of the casing 3 close to the gas supplement port 30, and then is extracted by the secondary screw compressor, in this way, the compressed air will uniformly and quickly pass through the stator 1 and the rotor 2, the compressed air in the casing 3 will quickly take away the heat generated by the stator 1 and the rotor 2, so as to ensure that the motor will not be burnt out due to high temperature. And, since the compressed air discharged from the primary screw compressor has certain heat, the heat is superimposed with the heat generated by the stator 1 and the rotor 2, so as to increase the intake heat of the secondary screw compressor, thereby improving the overall compression effect of the compressor.

[0034] The primary screw compressor comprises a male rotor one 4 and a female rotor one 5 matched with the male rotor one 4, the secondary screw compressor comprises a male rotor two 6 and a female rotor two 7 matched with the male rotor two 6, the size parameters of the male rotor one 4 and the male rotor two 6 are same, the size parameters of the female rotor one 5 and the female rotor two 7 are same, the number of teeth of the driving gear 8 is greater than the number of teeth of the driven gear 9, the ratio of the number of teeth of the driving gear 8 to the number of teeth of the driven gear 9 in the embodiment is 2:1, the above setting makes the rotating speed of the male rotor one 4 greater than the rotating speed of the male rotor two 6, that is, the compressed air amount of the primary screw compressor in unit time is greater than the compressed air amount of the secondary screw compressor, so that the secondary screw compressor can obtain sufficient and high density compressed air when the air is inhaled, thereby improving the compression capacity of the whole compressor;

[0035] Further specifically, the device further comprises an end cap one 10, a body 11 and an end cap two 12, the opening end of the casing 3 is away from the air supplement port 30;

[0036] The end cap one 10 is sealed at the opening end of the casing 3, one end of the body 11 is fixed away from the end cap one 10 of the casing 3, and the end cap two 12 is fixed away from the end cap one 10 of the body 11. The body 11 is provided with a rotor cavity one 110 and a rotor cavity two 111 which both penetrate through both ends of the body 11;

[0037] The male rotor one 4 and the female rotor one 5 are both limited in the rotor cavity one 110, the male rotor one 4 and the female rotor one 5 are matched and engaged, the axis line of the male rotor one 4 is parallel to the axis line of the rotor 2, the outer side wall of the male rotor one 4 and the female rotor one 5 are both in close contact with the inner side wall of the rotor cavity one 110, the male rotor one 4 and the female rotor one 5 are both rotationally connected with the end cap one 10 and the end cap two 12, and the male rotor one 4 is coaxially fixed with the driven gear 9;

[0038] The male rotor two 6 and the female rotor two 7 are both limited in the rotor cavity two 111, the male rotor two 6 and the female rotor two 7 are matched and engaged, the axis line of the male rotor two 6 is parallel to the axis line of the rotor 2, the outer side wall of the male rotor two 6 and the female rotor two 7 are both in close contact with the inner side wall of the rotor cavity two 111, the male rotor two 6 and the female rotor two 7 are both rotationally connected with the end cap one 10 and the end cap two 12, and the male rotor two 6 is coaxially fixed with the output shaft of the rotor 2;

[0039] The end cap one 10 is provided with an exhaust passage 100 and a through hole 101 which both penetrate through the end wall of the end cap one 10, the gas passage 31 penetrates through the opening end of the casing 3, one end of the exhaust passage 100 is communicated with the exhaust side of the rotor cavity one 110, when the end cap one 10 is sealed at the opening end of the casing 3, the other end of the exhaust passage 100 is corresponded and communicated with the gas passage 31, and the intake side of the rotor cavity two 111 is communicated with the inside of the casing 3 through the through hole 101;

[0040] The end cap two 12 is provided with an air inlet 120 and an air outlet 121, the air inlet 120 is communicated with the intake side of the rotor cavity one 110, the end cap two 12 is integrally provided with an air channel 122 and a mounting cavity 123, the air channel 122 is respectively communicated with the mounting cavity 123 and the exhaust side of the rotor cavity two 111, the air outlet 121 is communicated with the mounting cavity 123, and the mounting cavity 123 is hingedly provided with a baffle 14, under the condition that the compressor is stopped, the baffle 14 can seal the air channel 122 due to its own gravity.

[0041] Further specifically, the plane defined by the axis line of the male rotor one 4 and the axis line of the female rotor one 5 is perpendicular to the plane defined by the axis line of the male rotor two 6 and the axis line of the female rotor two 7.

[0042] Further, the oil storage cavity 112 is integrally formed on the machine body 11, and the oil channel is in communication with the oil storage cavity 112. The oil hole one 113 and the oil hole two 114 are respectively formed through the rotor cavity one 110 and the rotor cavity two 111 on the machine body 11. The rotor cavity one 110 is in communication with the oil channel through the oil hole one 113. The rotor cavity two 111 is in communication with the oil channel through the oil hole two 114. The opening of the oil storage cavity 112 is blocked by the cover 13. The cylindrical filter element is installed in the oil storage cavity 112. The oil in the oil storage cavity 112 flows into the oil channel through the cylindrical filter element. The oil hole one 113 and the oil hole two 114 are arranged to effectively lubricate the male rotor one 4 and the female rotor one 5 and the male rotor two 6 and the female rotor two 7, and improve the sealing performance of the male rotor one 4 and the female rotor one 5 in the rotor cavity one 110 and the sealing performance of the male rotor two 6 and the female rotor two 7 in the rotor cavity two 111, respectively.

[0043] Further, the oil passage one and the oil passage two are integrally formed on the end cover two 12. A plurality of connecting holes are formed on the end wall of the end cover two 12 close to the machine body 11 and on the end wall of the machine body 11 close to the end cover two 12. When the end cover two 12 is fixed to the machine body 11, the oil channel is in communication with the oil passage one and the oil passage two, respectively. The oil passage one penetrates to the rotary connection between the male rotor one 4 and the female rotor one 5 and the end cover two 12. The oil passage two penetrates to the rotary connection between the male rotor two 6 and the female rotor two 7 and the end cover two 12. The oil in the oil storage cavity 112 can lubricate the two rotary connections.

[0044] When the compressor works, the motor drives the primary screw compressor and the secondary screw compressor to work. Since the driving gear 8 and the driven gear 9 are arranged, the number of teeth of the driving gear 8 is greater than that of the driven gear 9. Therefore, the gas compression amount of the primary screw compressor in unit time is greater than that of the secondary screw compressor. The primary screw compressor extracts external gas for compression and discharges into the casing 3. The casing 3 is provided with a gas supplement port 30. The gas after primary compression and the gas entering into the casing 3 from the gas supplement port 30 are mixed and then enter into the secondary screw compressor for secondary compression, and then are discharged from the exhaust port 121. In the above process, the gas after primary compression and the gas entering into the casing 3 from the gas supplement port 30 can take away the heat generated during the operation of the motor, thereby achieving the effect of cooling.

[0045] In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0046] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single-unit two-stage compressor, characterized in that, include: The motor comprises a stator (1), a rotor (2), and a housing (3). The stator (1) and the rotor (2) are both installed inside the housing (3). One end of the housing (3) is provided with an air inlet (30) that communicates with the outside atmosphere. The other end of the housing (3) is equipped with the first-stage screw compressor and the second-stage screw compressor. A drive gear (8) is mounted on the output shaft of the rotor (2). A driven gear (9) is fixed at the power input end of the first-stage screw compressor. The drive gear (8) meshes with the driven gear (9). The output shaft of the rotor (2) is coaxially fixed with the power input end of the second-stage screw compressor. The air outlet of the first-stage screw compressor and the air inlet of the second-stage screw compressor are both connected to the inside of the housing (3). A gas channel (31) is integrally formed on the inner wall of the housing (3). The outlet end of the first-stage screw compressor is connected to the gas channel (31). An outlet (32) connected to the gas channel (31) is provided on the inner side wall of the housing (3). The outlet (32) is arranged near the end of the housing (3) where the make-up air port (30) is located. It also includes end cover one (10), body (11) and end cover two (12); the first-stage screw compressor includes male rotor one (4) and female rotor one (5), the second-stage screw compressor includes male rotor two (6) and female rotor two (7), and the housing (3) has an opening at one end away from the air inlet (30); The first end cap (10) seals the opening of the housing (3). One end of the body (11) is fixed to the end of the first end cap (10) away from the housing (3). The second end cap (12) is fixed to the end of the body (11) away from the first end cap (10). The body (11) has a rotor cavity 1 (110) and a rotor cavity 2 (111) that both penetrate its two ends. The first male rotor (4) and the first female rotor (5) are both limited in the first rotor cavity (110). The first male rotor (4) and the first female rotor (5) are both rotatably connected to the first end cap (10) and the second end cap (12). The first male rotor (4) is coaxially fixed to the driven gear (9). The second male rotor (6) and the second female rotor (7) are both limited in the second rotor cavity (111). The female rotor (7) is rotatably connected to the end cover (10) and the end cover (12), and the male rotor (6) is coaxially fixed with the output shaft of the rotor (2); the end cover (10) is provided with an exhaust channel (100) and a through hole (101) penetrating its end wall, one end of the exhaust channel (100) is connected to the exhaust side of the rotor cavity (110), and the other end of the exhaust channel (100) is connected to the gas channel (31), and the air intake side of the rotor cavity (111) is connected to the inside of the housing (3) through the through hole (101); the end cover (12) is provided with an air inlet (120) and an exhaust outlet (121), the air inlet (120) is connected to the air intake side of the rotor cavity (110), and the exhaust outlet (121) is connected to the exhaust side of the rotor cavity (111); The plane defined by the centerline of the male rotor 1 (4) and the centerline of the female rotor 1 (5) is perpendicular to the plane defined by the centerline of the male rotor 2 (6) and the centerline of the female rotor 2 (7); The number of teeth of the driving gear (8) is greater than the number of teeth of the driven gear (9).

2. A single-unit two-stage compressor according to claim 1, characterized in that, The body (11) is integrally formed with an oil storage cavity (112) and an oil passage communicating with the oil storage cavity (112). The body (11) is provided with an oil hole 1 (113) and an oil hole 2 (114) that pass through the rotor cavity 1 (110) and the rotor cavity 2 (111), respectively. The rotor cavity 1 (110) is connected to the oil passage through the oil hole 1 (113), and the rotor cavity 2 (111) is connected to the oil passage through the oil hole 2 (114). The opening of the oil storage cavity (112) is sealed with a cover (13). A cylindrical filter element is installed inside the oil storage cavity (112). The oil inside the oil storage cavity (112) flows through the cylindrical filter element and then flows into the oil passage.

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