Composite compressor

Abstract

The utility model discloses a compound compressor, which relates to the technical field of compressors and comprises a casing, a compound compression mechanism, a heat dissipation mechanism and an air inlet filtering mechanism, the casing comprises a diffusion cylinder, a rear round cover and a front round cover, the rear end of the diffusion cylinder is fixedly connected with the rear round cover, and the front end of the diffusion cylinder is detachably provided with the front round cover. The composite compression mechanism comprises a main shaft, the eccentric position of the front round cover is rotationally connected with the longitudinal main shaft through a front sealing bearing, the end, located in the diffusion air cylinder, of the main shaft is connected with a first-stage compression assembly, and the first-stage compression assembly is connected with a second-stage compression assembly. Compared with the prior art, high compression efficiency and pressure ratio can be obtained, entering air can be filtered, impurity particles in the air are prevented from entering the compressor to increase friction resistance in the compressor, lubricating oil can be injected under the condition that the front round cover is not opened, and maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field, concretely is a kind of composite compressor. BACKGROUND

[0002] Compressor is general machinery in aerospace, petrochemical industry and other fields, and the mainstream compressor on market mainly has sliding vane type, reciprocating type, centrifugal type and screw compressor currently. Sliding vane type compressor is simple in structure, and it is convenient to manufacture and maintain and small noise, so it is outstanding among numerous forms of compressor.

[0003] But sliding vane type compressor cannot reach higher compression efficiency and pressure ratio due to large frictional resistance, so prior art will adopt composite compression mode to improve compression efficiency and pressure ratio, however, impurity particles in external air can easily enter inside, which can increase the frictional resistance in the inside of compressor. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problems of overcoming the defects of prior art, providing a kind of composite compressor, air is compressed by rotor and is compressed by centrifugal mode secondarily, can obtain higher compression efficiency and pressure ratio, can filter the air entering, avoid the impurity particles in air to enter inside and increase the frictional resistance in the inside of compressor, and can be filled with lubricating oil without opening front round cover, it is convenient to maintain, can be cooled by means of heat dissipation mechanism when working, it is beneficial to maintain compressor in normal working state, can effectively solve the problems in background art.

[0005] To realize the above-mentioned purpose, the utility model provides the following technical scheme: a kind of composite compressor, including casing, the casing includes pressure recovery cylinder, rear round cover and front round cover, the rear end of the pressure recovery cylinder is fixedly connected with rear round cover, the front end of the pressure recovery cylinder is detachably installed with front round cover, further comprising:

[0006] Composite compression mechanism, including front sealing bearing, main shaft, main shaft air inlet passage, main shaft air inlet hole, machine body exhaust pipe, primary compression component and secondary compression component, the eccentric position of the front round cover is rotatably connected with longitudinal main shaft by front sealing bearing, one end of main shaft in pressure recovery cylinder is connected with primary compression component, primary compression component is connected with secondary compression component, main shaft air inlet passage is arranged in the rear end of main shaft, main shaft air inlet hole is arranged on the outer circumferential side of the shaft section of main shaft before front sealing bearing, main shaft air inlet hole is communicated with main shaft air inlet passage, the outer circumferential side of the pressure recovery cylinder is connected with machine body exhaust pipe;

[0007] Heat dissipation mechanism, installed at the back of rear round cover;

[0008] Air inlet filtering mechanism, installed at the front side of front round cover.

[0009] The main shaft is connected with an external power source, the external power source drives the main shaft to rotate clockwise relative to the front circular cover through the front sealing bearing, the main shaft drives the first compression assembly to work, external air enters the first compression assembly for the first compression through the main shaft air inlet hole and the main shaft air inlet channel, then the air is compressed for the second time through the second compression assembly, and finally the air is discharged through the engine body exhaust pipe, the heat dissipation mechanism can dissipate heat on the rear side of the rear circular cover with the working of the first compression assembly, promote the discharge of heat in the expansion cylinder, avoid the generation of too much heat energy of the continuously compressed air in the expansion cylinder, the air inlet filtering mechanism can filter the air entering the main shaft air inlet hole, avoid the impurity particles in the air from entering the expansion cylinder to increase the friction force when the first compression assembly and the second compression assembly work, and the first compression assembly and the second compression assembly can be protected.

[0010] Further, the first compression assembly comprises a rear sealing bearing, a driven shaft, a rotary cylinder, a rotor, a sliding vane groove, a sliding vane, a radial air inlet, a rotor air inlet channel and a radial exhaust port, the center of the rear circular cover is rotationally connected with the longitudinal driven shaft through the rear sealing bearing, one end of the driven shaft in the expansion cylinder is fixedly connected with the rear end center of the rotary cylinder, the outer periphery of the rotary cylinder is provided with the radial exhaust port, the inner wall of the rotary cylinder is provided with the sliding vane distributed along the radial direction of the rotary cylinder, the rotor is in a cylindrical structure, the rear end of the main shaft extends into the rotary cylinder and is fixedly connected with the front end middle part of the rotor, the middle front side of the rotor is provided with the rotor air inlet channel communicated with the main shaft air inlet channel, the outer periphery of the rotor is provided with the radial air inlet communicated with the rotor air inlet channel, the radial air inlet and the radial exhaust port are respectively located on the two sides of the sliding vane, the outer periphery of the rotor is provided with the sliding vane groove distributed along the radial direction of the rotor, and the sliding vane groove is slidingly connected with the sliding vane.

[0011] When the slide groove on the rotor is oriented upward, the radial intake port is located on the left side of the slide, the radial exhaust port is located on the right side of the slide, the main shaft rotates clockwise to drive the rotor to rotate clockwise, at this time, the rotor is located at the eccentric position in the rotating cylinder, because the slide groove is connected with the slide, the rotor can drive the rotating cylinder and the driven shaft to rotate clockwise by the cooperation of the slide groove and the slide, wherein the slide and the rotor divide the rotating cylinder into a crescent-shaped intake volume and a crescent-shaped exhaust volume, the intake volume is communicated with the radial intake port, and the exhaust volume is communicated with the radial exhaust port, during the clockwise rotation of the main shaft, the rotor, the driven shaft and the rotating cylinder, external air enters the main shaft intake channel through the main shaft intake hole, and then enters the intake volume through the rotor intake channel and the radial intake port, with the rotation of the rotor in the rotating cylinder, air is compressed from the intake volume into the exhaust volume, and then the compressed air in the intake volume enters the space between the rotating cylinder and the diffuser cylinder through the radial exhaust port, and then is compressed twice by the secondary compression assembly and is discharged through the machine body exhaust pipe, air is compressed by the rotor first, and then is further compressed by the secondary compression assembly, so that higher compression efficiency and compression ratio can be obtained in a relatively small volume.

[0012] Further, the primary compression assembly further comprises a pressure relief valve, and the radial exhaust port is provided with the pressure relief valve. The pressure relief valve is a one-way valve, which allows air in the exhaust volume to flow outward of the rotating cylinder in one direction only, thereby avoiding backflow of air.

[0013] Further, the secondary compression assembly comprises centrifugal blades, and a plurality of centrifugal blades are arranged in an annular array on the outer periphery of the rotating cylinder. The centrifugal blades rotate with the rotating cylinder, and air is compressed twice by the centrifugal work of the centrifugal blades, so that the air is discharged from the machine body exhaust pipe.

[0014] Further, two arc surfaces are arranged on the two sides of one end of the slide in the slide groove, and the two arc surfaces are respectively tangent to the two sides of the slide groove. The slide and the slide groove maintain uniform linear contact, so as to reduce the internal stress of the slide and the friction between the slide and the slide groove.

[0015] Further, the machine shell further comprises fixing lugs, dismounting lugs and dismounting bolts, a plurality of fixing lugs are arranged in an annular array on the outer periphery of the front end of the diffuser cylinder, the dismounting lugs are fixedly connected to the fixing lugs in correspondence with the positions of the fixing lugs on the outer periphery of the front cover, and the dismounting lugs are fixedly connected to the corresponding fixing lugs through the dismounting bolts. The cooperation of the fixing lugs, the dismounting lugs and the dismounting bolts realizes the detachable connection between the front cover and the front end of the diffuser cylinder.

[0016] Further, the heat dissipation mechanism comprises heat dissipation pipes, a fixing sleeve and blowing blades, a plurality of heat dissipation pipes are arranged on the rear side of the rear circular cover in an annular array, and the heat dissipation pipes are distributed along the radial direction of the rear circular cover, the fixing sleeve is sleeved with the fixing sleeve at the position corresponding to the heat dissipation pipe at the rear end of the driven shaft, and the outer circumferential side of the fixing sleeve is arranged in an annular array with blowing blades. The fixing sleeve drives the blowing blades to rotate with the rotation of the driven shaft, the blowing blades fan the wind in all directions, the wind is discharged through the heat dissipation pipes, and the wind carries the heat on the rear circular cover when passing through the inside of the heat dissipation pipes, thereby facilitating the removal of part of the heat in the expansion cylinder and avoiding the accumulation of heat energy to affect the normal work.

[0017] Further, the heat dissipation mechanism further comprises an expansion pipe opening, and one end of the heat dissipation pipe close to the fixing sleeve is provided with the expansion pipe opening. The arrangement of the expansion pipe opening facilitates the collection of airflow into the heat dissipation pipe, allows more airflow to enter the heat dissipation pipe, and improves the heat dissipation effect.

[0018] Further, the air inlet filtering mechanism comprises a hemispherical filter screen, a circular ring, mounting bolts and mounting bearings, the front end of the main shaft is rotatably connected to the middle part of the front end of the hemispherical filter screen through the mounting bearings, the rear side edge of the hemispherical filter screen is provided with a circular ring, and the circular ring is mounted on the front side of the front circular cover through the mounting bolts. The mounting bolts fix the circular ring to install the hemispherical filter screen, and the mounting bearings connect the hemispherical filter screen and the main shaft together, so that the rotation of the main shaft does not interfere with the hemispherical filter screen. The hemispherical filter screen covers the main shaft air inlet hole on the main shaft, and the external air enters the main shaft air inlet hole after being filtered by the hemispherical filter screen. The hemispherical filter screen can filter out impurity particles in the air to prevent impurity particles from entering the rotary cylinder and the expansion cylinder, reduce internal friction, and improve the working stability of the compressor.

[0019] Further, the lubricating oil adding mechanism comprises a main shaft lubricating oil channel, a rotor lubricating oil channel, an oil injection screw hole and an oil injection bolt, the inside of the rotor is provided with the rotor lubricating oil channel, the end of the rotor lubricating oil channel is communicated with the sliding vane groove, the inside of the main shaft is provided with the main shaft lubricating oil channel communicated with the rotor lubricating oil channel, the oil injection screw hole is arranged at the position of the front side of the mounting bearing of the main shaft, the oil injection screw hole is communicated with the main shaft lubricating oil channel, and the oil injection bolt is screwed in the oil injection screw hole. When the sliding vane is slidingly connected with the sliding vane groove, there will be a certain wear, and if the wear is excessive, there will be a gap between the sliding vane and the sliding vane groove, affecting the compression of air. Therefore, the sliding vane and the sliding vane groove need to be lubricated. After the lubricating oil adding mechanism is arranged, the oil injection bolt is loosened, and the lubricating oil can be injected into the oil injection screw hole. The lubricating oil enters the sliding vane groove through the main shaft lubricating oil channel and the rotor lubricating oil channel, lubricates the sliding vane and the sliding vane groove, improves the air tightness between the sliding vane and the sliding vane groove, and promotes the stability of air compression.

[0020] Compared with the prior art, the compound compressor has the beneficial effects that:

[0021] 1、In the process of clockwise rotation of the main shaft, the rotor, the driven shaft and the rotary cylinder, external air enters the main shaft intake passage through the main shaft intake hole, and then enters the intake volume through the rotor intake passage and the radial intake port. With the rotation of the rotor in the rotary cylinder, the air is compressed from the intake volume into the exhaust volume, and then the compressed air in the intake volume enters the space between the rotary cylinder and the diffuser cylinder through the radial exhaust port, and then is compressed twice by the secondary compression assembly and discharged through the body exhaust pipe. The air is first compressed by the rotor, and then further compressed by the secondary compression assembly, so that a higher compression efficiency and pressure ratio can be obtained in a relatively small volume.

[0022] 2、The hemispherical filter cover covers the main shaft intake hole on the main shaft, and external air enters the main shaft intake hole after being filtered by the hemispherical filter. The hemispherical filter can filter impurity particles in the air, so that impurity particles can be prevented from entering the rotary cylinder and the diffuser cylinder, the internal friction can be reduced, and the working stability of the compressor can be improved.

[0023] 3、Tighten the oil injection bolt, open the oil injection screw hole, and then inject lubricating oil. The lubricating oil enters the slide groove through the main shaft lubricating oil channel and the rotor lubricating oil channel, lubricates the slide and the slide groove, improves the air tightness between the slide and the slide groove, and promotes the compression stability of the air.

[0024] 4、The air is compressed by the rotor and then compressed again by centrifugal force, so that a higher compression efficiency and pressure ratio can be obtained. The air can be filtered to prevent impurity particles in the air from entering the interior and increasing the friction resistance in the compressor. The lubricating oil can be injected without opening the front round cover, so that the maintenance is convenient. The heat dissipation mechanism can be used for heat dissipation during work, so that the compressor can be maintained in a normal working state. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of the utility model;

[0026] Figure 2 is a structural schematic diagram of the rear side of the utility model;

[0027] Figure 3 is a structural schematic diagram of the utility model; Figure 1

[0028] Figure 4 is a structural schematic diagram of the utility model; Figure 2

[0029] Figure 5 is a sectional structural schematic diagram of the rotor and the main shaft of the utility model;​​

[0030] In the figure: 1 housing, 11 pressure expansion cylinder, 12 rear round cover, 13 fixed lug seat, 14 front round cover, 15 dismounting lug seat, 16 dismounting bolt, 2 compound compression mechanism, 21 rear sealing bearing, 22 driven shaft, 23 rotary cylinder, 24 front sealing bearing, 25 main shaft, 26 rotor, 27 sliding vane groove, 28 sliding vane, 29 radial air inlet, 210 rotor air inlet channel, 211 main shaft air inlet channel, 212 main shaft air inlet hole, 213 pressure relief valve, 214 radial air outlet, 215 centrifugal blade, 216 machine body air outlet pipe, 3 heat dissipation mechanism, 31 heat dissipation pipeline, 32 expansion pipeline opening, 33 fixed sleeve, 34 blowing blade, 4 air inlet filtering mechanism, 41 hemispherical filter screen, 42 circular ring, 43 mounting bolt, 44 mounting bearing, 5 lubricating oil adding mechanism, 51 main shaft lubricating oil channel, 52 rotor lubricating oil channel, 53 oil injection screw hole, 54 oil injection bolt. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part 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 labor fall within the scope of protection of the present application.

[0032] Embodiment one, please refer to Figures 1 to 5 The present application provides a technical solution: a compound compressor, comprising a housing 1, the housing 1 comprising a pressure expansion cylinder 11, a rear round cover 12 and a front round cover 14, the rear end of the pressure expansion cylinder 11 being fixedly connected with the rear round cover 12, and the front end of the pressure expansion cylinder 11 being detachably installed with the front round cover 14, further comprising a compound compression mechanism 2, a heat dissipation mechanism 3 and an air inlet filtering mechanism 4.

[0033] The compound compression mechanism 2 comprises a front sealing bearing 24, a main shaft 25, a main shaft air inlet channel 211, a main shaft air inlet hole 212, a machine body air outlet pipe 216, a primary compression assembly and a secondary compression assembly, the eccentric position of the front round cover 14 being rotationally connected with a longitudinal main shaft 25 through the front sealing bearing 24, one end of the main shaft 25 located in the pressure expansion cylinder 11 being connected with the primary compression assembly, the primary compression assembly being connected with the secondary compression assembly, the main shaft air inlet channel 211 being formed in the rear end of the main shaft 25, the main shaft air inlet hole 212 being formed in the outer circumferential side of the shaft segment of the main shaft 25 located in front of the front sealing bearing 24, the main shaft air inlet hole 212 being in communication with the main shaft air inlet channel 211, and the outer circumferential side of the pressure expansion cylinder 11 being connected with the machine body air outlet pipe 216.

[0034] The primary compression assembly comprises a rear sealing bearing 21, a driven shaft 22, a rotary cylinder 23, a rotor 26, a sliding vane groove 27, a sliding vane 28, a radial inlet 29, a rotor inlet passage 210 and a radial outlet 214. The center of the rear circular cover 12 is rotationally connected to the longitudinal driven shaft 22 through the rear sealing bearing 21. The driven shaft 22 is fixedly connected to the rear end center of the rotary cylinder 23 at one end located in the diffuser cylinder 11. The outer circumferential side of the rotary cylinder 23 is provided with the radial outlet 214. The inner wall of the rotary cylinder 23 is provided with the sliding vane 28 distributed along the radial direction of the rotary cylinder 23. The rotor 26 has a cylindrical structure. The rear end of the main shaft 25 extends into the rotary cylinder 23 and is fixedly connected to the front end middle part of the rotor 26. The middle front side of the rotor 26 is provided with the rotor inlet passage 210 in communication with the main shaft inlet passage 211. The outer circumferential side of the rotor 26 is provided with the radial inlet 29 in communication with the rotor inlet passage 210. The radial inlet 29 and the radial outlet 214 are located on the left and right sides of the sliding vane 28, respectively. The outer circumferential side of the rotor 26 is provided with the sliding vane groove 27 distributed along the radial direction of the rotor 26. The sliding vane groove 27 is slidingly connected to the sliding vane 28.

[0035] When the sliding vane groove 27 on the rotor 26 faces upward, the radial inlet 29 is located on the left side of the sliding vane 28, and the radial outlet 214 is located on the right side of the sliding vane 28.

[0036] In use, the main shaft 25 rotates clockwise to drive the rotor 26 to rotate clockwise. At this time, the rotor 26 is located at an eccentric position in the rotary cylinder 23. Since the sliding vane groove 27 is slidingly connected to the sliding vane 28, the rotor 26 can drive the rotary cylinder 23 and the driven shaft 22 to rotate clockwise by the cooperation of the sliding vane groove 27 and the sliding vane 28. The sliding vane 28 and the rotor 26 divide the rotary cylinder 23 into a crescent-shaped intake volume and a crescent-shaped exhaust volume. The intake volume is in communication with the radial inlet 29, and the exhaust volume is in communication with the radial outlet 214. During the clockwise rotation of the main shaft 25, the rotor 26, the driven shaft 22 and the rotary cylinder 23, external air enters the main shaft inlet passage 211 through the main shaft inlet hole 212, then enters the intake volume through the rotor inlet passage 210 and the radial inlet 29. With the rotation of the rotor 26 in the rotary cylinder 23, the air is compressed from the intake volume into the exhaust volume. Then the compressed air in the intake volume enters the space between the rotary cylinder 23 and the diffuser cylinder 11 through the radial outlet 214, and is then compressed by the secondary compression assembly for the second time before being discharged through the machine body exhaust pipe 216. The air is first compressed by the rotor 26, and then further compressed by the secondary compression assembly, so that a relatively high compression efficiency and compression ratio can be obtained in a relatively small volume.

[0037] The primary compression assembly further comprises a pressure relief valve 213, which is installed in the radial exhaust port 214. The pressure relief valve 213 is a one-way valve, which allows air in the exhaust volume to flow outward of the rotary cylinder 23 in one direction only, avoiding backflow of air.

[0038] The secondary compression assembly comprises centrifugal blades 215, which are arranged in an annular array on the outer periphery of the rotary cylinder 23. The centrifugal blades 215 can be selected in an appropriate number as required. The centrifugal blades 215 rotate with the rotary cylinder 23, and perform secondary compression on air through centrifugal work of the centrifugal blades 215, allowing the air to be discharged from the body exhaust pipe 216.

[0039] The sliding vane 28 is provided with two circular arc surfaces on both sides of one end in the sliding vane groove 27, and the two circular arc surfaces are respectively tangent to the two sides of the sliding vane groove 27. The sliding vane 28 and the sliding vane groove 27 maintain uniform linear contact, so as to reduce internal stress of the sliding vane 28 and friction between the sliding vane 28 and the sliding vane groove 27.

[0040] The casing 1 further comprises fixing lugs 13, dismounting lugs 15, and dismounting bolts 16. The front end of the diffuser cylinder 11 is provided with a plurality of fixing lugs 13 arranged in an annular array on the outer periphery. The number of the fixing lugs 13 is four. The outer periphery of the front circular cover 14 is fixedly connected with dismounting lugs 15 corresponding to the positions of the fixing lugs 13. The dismounting lugs 15 are fixedly connected with the corresponding fixing lugs 13 through the dismounting bolts 16. The front circular cover 14 is detachably connected with the front end of the diffuser cylinder 11 by cooperation of the fixing lugs 13, the dismounting lugs 15, and the dismounting bolts 16.

[0041] The heat dissipation mechanism 3 is installed on the rear side of the rear circular cover 12;

[0042] The heat dissipation mechanism 3 comprises heat dissipation pipes 31, fixing sleeves 33, and blowing vanes 34. The rear side of the rear circular cover 12 is provided with a plurality of heat dissipation pipes 31 arranged in an annular array. The number of the heat dissipation pipes 31 is six. The heat dissipation pipes 31 are distributed along the radial direction of the rear circular cover 12. The rear end of the driven shaft 22 is fixedly sleeved with a fixing sleeve 33 corresponding to the position of the heat dissipation pipe 31. The outer periphery of the fixing sleeve 33 is provided with blowing vanes 34 arranged in an annular array. The fixing sleeve 33 drives the blowing vanes 34 to rotate with the rotation of the driven shaft 22. The blowing vanes 34 fan air in all directions. The air is discharged through the heat dissipation pipes 31. When the air passes through the heat dissipation pipes 31, the heat on the rear circular cover 12 is carried away, thereby facilitating the removal of part of the heat in the diffuser cylinder 11 and avoiding the accumulation of heat energy to affect the normal operation.

[0043] The heat dissipation mechanism 3 further comprises an expansion pipe opening 32. One end of the heat dissipation pipe 31 close to the fixing sleeve 33 is provided with the expansion pipe opening 32. The expansion pipe opening 32 facilitates the collection of air flow into the heat dissipation pipe 31, allowing more air flow to enter the heat dissipation pipe 31, thereby improving the heat dissipation effect.

[0044] The air inlet filtering mechanism 4 is installed on the front side of the front circular cover 14.

[0045] The main shaft 25 is connected with an external power source, the external power source drives the main shaft 25 to rotate clockwise relative to the front circular cover 14 through the front sealing bearing 24, the main shaft 25 drives the primary compression assembly to work, so that the external air enters the primary compression assembly to be compressed for the first time through the main shaft air inlet hole 212 and the main shaft air inlet channel 211, then is compressed for the second time through the secondary compression assembly, and finally is discharged through the cylinder exhaust pipe 216, the heat dissipation mechanism 3 can dissipate heat on the rear side of the rear circular cover 12 along with the working of the primary compression assembly, so that the heat in the expansion cylinder 11 is discharged, and the continuous compression of the air in the expansion cylinder 11 is avoided to generate excessive heat energy, the air inlet filtering mechanism 4 can filter the air entering the main shaft air inlet hole 212, so that the impurity particles in the air are prevented from entering the expansion cylinder 11 to increase the friction when the primary compression assembly and the secondary compression assembly work, and the primary compression assembly and the secondary compression assembly can be protected.

[0046] Embodiment two, please refer to Figures 1 to 5 The utility model provides a kind of composite compressor, and the embodiment is the further explanation of the structure of embodiment one;

[0047] The air inlet filtering mechanism 4 includes a hemispherical filter screen 41, a circular ring 42, mounting bolts 43 and mounting bearings 44, the front end of the main shaft 25 is rotatably connected to the middle part of the front end of the hemispherical filter screen 41 through the mounting bearings 44, the rear side of the hemispherical filter screen 41 is provided with the circular ring 42, and the circular ring 42 is mounted on the front side of the front circular cover 14 through the mounting bolts 43. The mounting bolts 43 fix the circular ring 42, so as to install the hemispherical filter screen 41, and the mounting bearings 44 connect the hemispherical filter screen 41 and the main shaft 25 together, so that the rotation of the main shaft 25 does not interfere with the hemispherical filter screen 41. The hemispherical filter screen 41 covers the main shaft air inlet hole 212 on the main shaft 25, and the external air enters the main shaft air inlet hole 212 after being filtered by the hemispherical filter screen 41. The hemispherical filter screen 41 can filter the impurity particles in the air, so as to prevent the impurity particles from entering the rotary cylinder 23 and the expansion cylinder 11, reduce the internal friction, and improve the working stability of the compressor.

[0048] Embodiment three, please refer to Figures 1 to 5 The utility model provides a kind of composite compressor, and the embodiment is substantially same as the structure of embodiment two, and the difference is that:

[0049] The lubricating oil adding mechanism 5 comprises a main shaft lubricating oil channel 51, a rotor lubricating oil channel 52, an oil injection screw hole 53 and an oil injection bolt 54, the rotor 26 is internally provided with the rotor lubricating oil channel 52, the end of the rotor lubricating oil channel 52 is communicated with the sliding vane groove 27, the main shaft 25 is internally provided with the main shaft lubricating oil channel 51 communicated with the rotor lubricating oil channel 52, the main shaft 25 is internally provided with the oil injection screw hole 53 at the position of the front side of the mounting bearing 44, the oil injection screw hole 53 is communicated with the main shaft lubricating oil channel 51, and the oil injection screw hole 53 is internally screwed with the oil injection bolt 54.

[0050] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0051] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A compound compressor comprising a casing (1) containing a diffuser cylinder (11), a rear circular cover (12) and a front circular cover (14), the rear end of the diffuser cylinder (11) being fixedly connected with the rear circular cover (12), and the front end of the diffuser cylinder (11) being detachably installed with the front circular cover (14), characterized in that, Also includes: The composite compression mechanism (2) comprises a front sealing bearing (24), a main shaft (25), a main shaft air inlet channel (211), a main shaft air inlet hole (212), a body exhaust pipe (216), a primary compression assembly and a secondary compression assembly, the eccentric position of the front circular cover (14) is rotatably connected with the longitudinal main shaft (25) through the front sealing bearing (24), one end of the main shaft (25) located in the diffuser cylinder (11) is connected with the primary compression assembly, the primary compression assembly is connected with the secondary compression assembly, a main shaft air inlet channel (211) is formed in the rear end of the main shaft (25), a main shaft air inlet hole (212) is formed in the outer circumferential side of the shaft segment of the main shaft (25) located in front of the front sealing bearing (24), the main shaft air inlet hole (212) is in communication with the main shaft air inlet channel (211), and the outer circumferential side of the diffuser cylinder (11) is connected with the body exhaust pipe (216); The heat dissipation mechanism (3) is installed on the rear side of the rear circular cover (12); The air inlet filtering mechanism (4) is installed on the front side of the front circular cover (14).

2. A compound compressor according to claim 1, characterized in that: The primary compression assembly comprises a rear sealing bearing (21), a driven shaft (22), a rotary cylinder (23), a rotor (26), a sliding vane groove (27), a sliding vane (28), a radial air inlet (29), a rotor air inlet channel (210) and a radial exhaust port (214), the center of the rear circular cover (12) is rotatably connected with the longitudinal driven shaft (22) through the rear sealing bearing (21), one end of the driven shaft (22) located in the diffuser cylinder (11) is fixedly connected with the rear end center of the rotary cylinder (23), a radial exhaust port (214) is formed in the outer circumferential side of the rotary cylinder (23), the inner wall of the rotary cylinder (23) is provided with sliding vanes (28) distributed along the radial direction of the rotary cylinder (23), the rotor (26) is in a cylindrical structure, the rear end of the main shaft (25) extends into the rotary cylinder (23) and is fixedly connected with the front end middle part of the rotor (26), a rotor air inlet channel (210) in communication with the main shaft air inlet channel (211) is formed in the middle front side of the rotor (26), a radial air inlet (29) in communication with the rotor air inlet channel (210) is formed in the outer circumferential side of the rotor (26), the radial air inlet (29) and the radial exhaust port (214) are respectively located on the two sides of the sliding vane (28), a sliding vane groove (27) distributed along the radial direction of the rotor (26) is formed in the outer circumferential side of the rotor (26), and the sliding vane groove (27) is slidably connected with the sliding vane (28).

3. A compound compressor according to claim 2, wherein: The primary compression assembly further comprises a pressure relief valve (213), and the pressure relief valve (213) is installed in the radial exhaust port (214).

4. A compound compressor as set forth in claim 2, wherein: The secondary compression assembly comprises centrifugal blades (215), and a plurality of centrifugal blades (215) are annularly arranged on the outer circumferential side of the rotary cylinder (23).

5. A compound compressor as set forth in claim 2, wherein: Two circular arc surfaces are respectively arranged on the two sides of one end of the sliding vane (28) located in the sliding vane groove (27), and the two circular arc surfaces are respectively tangent to the two sides of the sliding vane groove (27).

6. A compound compressor as set forth in claim 1, wherein: The shell (1) further comprises fixing lugs (13), dismounting lugs (15) and dismounting bolts (16), the front end outer periphery side of the diffuser cylinder (11) is provided with a plurality of fixing lugs (13), the outer periphery side of the front circular cover (14) is fixedly connected with dismounting lugs (15) corresponding to the positions of the fixing lugs (13), and the dismounting lugs (15) are fixedly connected with the corresponding fixing lugs (13) through the dismounting bolts (16).

7. A compound compressor as claimed in claim 2, wherein: The heat dissipation mechanism (3) comprises heat dissipation pipes (31), fixing sleeves (33) and blowing blades (34), the rear side of the rear circular cover (12) is provided with a plurality of heat dissipation pipes (31) in an annular array, the heat dissipation pipes (31) are distributed along the radial direction of the rear circular cover (12), the rear end of the driven shaft (22) is fixedly sleeved with a fixing sleeve (33) corresponding to the position of the heat dissipation pipe (31), and the outer periphery side of the fixing sleeve (33) is provided with blowing blades (34) in an annular array.

8. A compound compressor according to claim 7, characterized in that: The heat dissipation mechanism (3) further comprises expansion pipe openings (32), and one end of the heat dissipation pipe (31) close to the fixing sleeve (33) is provided with an expansion pipe opening (32).

9. A compound compressor as set forth in claim 2, wherein: The air inlet filtering mechanism (4) comprises a hemispherical filter screen (41), a circular ring (42), mounting bolts (43) and mounting bearings (44), the front end of the main shaft (25) is rotatably connected to the middle part of the front end of the hemispherical filter screen (41) through the mounting bearings (44), the rear side edge of the hemispherical filter screen (41) is provided with a circular ring (42), and the circular ring (42) is mounted on the front side of the front circular cover (14) through the mounting bolts (43).

10. A compound compressor as claimed in claim 9, wherein: The lubricating oil adding mechanism (5) comprises a main shaft lubricating oil channel (51), a rotor lubricating oil channel (52), an oil injection screw hole (53) and an oil injection bolt (54), the inside of the rotor (26) is provided with the rotor lubricating oil channel (52), the end of the rotor lubricating oil channel (52) is communicated with the sliding vane groove (27), the inside of the main shaft (25) is provided with the main shaft lubricating oil channel (51) communicated with the rotor lubricating oil channel (52), the oil injection screw hole (53) is formed on the front side of the mounting bearing (44) of the main shaft (25), the oil injection screw hole (53) is communicated with the main shaft lubricating oil channel (51), and the oil injection bolt (54) is threadedly connected in the oil injection screw hole (53).

Images