Combined compressor

Abstract

The utility model discloses a combined compressor which comprises a motor and further comprises a first-stage compressor body, a second-stage compressor body, a third-stage compressor body, a fourth-stage compressor body, a compressor body, a middle body, a compressor body, a connecting rod, a crosshead, a piston rod, a connecting cylinder, a pressure body B and a pressure body C. The power output end of the motor is provided with the first-stage compressor body, the second-stage compressor body, the third-stage compressor body and the fourth-stage compressor body through the compressor bodies. The machine body is composed of a middle body and a machine body, the device is of an eight-column eight-stage counter-dynamic balance type, air cylinder water cooling, pressure circulating lubrication and motor dragging, all columns of air cylinders are horizontally arranged and distributed on the two sides of a crankshaft, the device has the advantages of being good in dynamic balance performance, convenient to operate and overhaul and the like, the motor is of a dual-drive structure, four columns of compressor units are arranged on each side of the motor, the overall structure is optimized, and the service life is prolonged. The staggered angles of the cranks among the rows are reasonably arranged, the inherent frequency of a shaft system is changed, the torsional vibration of the shaft system can be effectively reduced, the jumping problem of the crankshaft is greatly relieved, and therefore vibration and noise of a unit are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressor technical field, especially a kind of combined compressor. BACKGROUND

[0002] Combined compressor refers to the compressor of different compressed medium, suction and exhaust power, and the compressor of non-front and rear stage relationship, a compressor can compress several gases simultaneously, and only single machine can replace several machines, original driver and corresponding auxiliary equipment, reduce the area of building, reduce equipment price, improve equipment efficiency, and start, operation is simple, mainly used to improve gas pressure, meet the needs of production process, mainly used in chemical fertilizer, petrochemical, chemical industry department, also applicable to other industrial departments using same medium and meeting its pressure and gas volume, and widely used.

[0003] The existing combined compressor has the following disadvantages when in use: the traditional 8-column compressor is a motor single-drive structure, the motor rotor is connected with the main machine crankshaft, the multi-mass shafting formed has inertia and elasticity and its inherent free torsional vibration characteristics, when the exciting frequency generated by gas force and inertia force in the working of the compressor is close to the torsional vibration frequency of the shafting, the shafting will produce strong torsional vibration, which increases the vibration of the machine body, especially accelerates the wear of the non-driving end bearing, and even causes direct fatigue cracks of the non-driving end crankshaft, the fatigue cracks at the crank of the crankshaft break and damage, which causes easy wear of the equipment and high maintenance cost, therefore, we propose a combined compressor. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a combined compressor, the motor adopts double-drive structure, each side of the motor is 4-column compressor unit, optimizes the overall structure, reasonably arranges the skew angle of the crank between each column, changes the inherent frequency of the shafting, can effectively reduce the torsional vibration of the shafting, greatly reduces the jumping problem of the crankshaft, thereby greatly reduces the vibration and noise of the unit, and can effectively solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] A combined compressor, comprising a motor, a first machine body, a second machine body, a third machine body, a fourth machine body, a machine body, a middle body, a machine body, a connecting rod, a cross head, a piston rod, a sleeve, a pressure body B and a pressure body C, the power output end of the motor is installed with the first machine body, the second machine body, the third machine body and the fourth machine body through the machine body, the machine body is composed of the middle body and the machine body, the middle body is arranged on both sides of the machine body, and an oil inlet pipe is arranged on one side of the machine body; a cross beam is arranged at the top of the machine body, and a main bearing bush is installed in the machine body; a connecting stud is arranged on the installation end of the main bearing bush, and a cover plate is clamped on the top of the machine body; the surface of the machine body and the surface of the middle body are respectively provided with a machine body foot and a middle body foot.

[0007] Further, the main shaft neck and the positioning main shaft neck connected with the main bearing are installed inside the machine body, the crank arm and the crank pin are integrally formed between the main shaft neck and the positioning main shaft neck, the flange and the positioning stop are arranged at the end of the positioning main shaft neck, the big end bushing is cooperatively installed at the end of the connecting rod, the connecting rod and the big end bushing are detachably connected by the connecting rod bolt and the connecting rod nut, the positioning pin and the small end sleeve are respectively arranged at the two ends of the connecting rod, the oil baffle and the sealing element are arranged on the outer periphery of the positioning main shaft neck; one crank of the crankshaft is mainly composed of three parts of the main shaft neck, the crank pin and the crank arm, the included angle of the opposite crank is 180°, the power input end of the crankshaft is provided with the coupling flange, the flange is integrally formed with the crankshaft, the input torque is transmitted by the friction force generated on the connecting surface of the flange through the bolt fastened on the coupling disc, the axial positioning of the crankshaft is completed by the positioning ring and the main bearing on the positioning platform of the first main shaft neck of the power input end, so as to prevent the axial movement of the crankshaft, the axial thermal expansion gap is left at the positioning end, the oil slinger is arranged on the outer side of the positioning main shaft neck, when the shaft end penetrates through the rear cover of the machine body, the felt is used as the oil seal, the crankshaft is integrally formed as a solid structure by forging and processing of steel, the oil hole is not drilled in the shaft body, so as to reduce the stress concentration phenomenon, the connecting rod is divided into two parts of the connecting rod body and the big end bushing, the two parts are connected into an integral by two connecting rod bolts, the big end bushing is a split type thin arm bushing, the back material of the bushing is carbon steel, the surface of the bushing is bearing alloy, the inner side surface of the big end hole is inlaid with a cylindrical pin, which is used for the axial positioning of the big end bushing and prevents the rotation of the bushing, the connecting rod adopts the small end positioning mode, which is convenient and fast to install, the small end and the small end sleeve are integrated, the bushing material is tin bronze, the oil hole is drilled in the connecting rod body along the axial direction of the rod body and is communicated with the ring groove of the big and small end bushing back, the lubricating oil can be distributed to the crosshead pin and the crank pin through the radial oil hole on the bushing through the annular groove, in order to ensure that the connecting rod safely and reliably transmits the alternating load, the hydraulic fastening connection mode is adopted, the connecting rod bolt must have sufficient pre-tightening force, the size of the pre-tightening force is ensured by the elongation of the connecting rod bolt after fastening, the connecting rod, the big end bushing and the connecting rod bolt are made of alloy structural steel.

[0008] Further, the crosshead is surface-mounted with the slide shoe and connected with the slide shoe through the pin, the bolt A is inserted into the crosshead, the nut is cooperatively connected with the surface of the bolt A, the gland is installed on the surface of the crosshead close to the nut, the O-ring is sleeved on the outer periphery of the bolt A installation side, the screw A is installed between the crosshead and the slide shoe, and the key is installed at the connecting end of the crosshead; the crosshead is a double-sided cylindrical split combined structure, the crosshead body and the upper and lower detachable slide shoes are positioned by the tenon and groove and connected into an integral by the screw, the adjusting gasket is arranged between the slide shoe and the crosshead, the crossheads on the two sides of the machine body are opposite in the direction of the lateral force, in order to ensure the concentricity of the crosshead and the piston rod during operation, the number of gaskets between the crossheads and the slide shoes of the crossheads opposite in the direction of the lateral force is adjusted during assembly, the slide shoe back material is carbon steel, the pressure bearing surface is hung with bearing alloy, and the oil groove is opened to facilitate the distribution of the lubricating oil.

[0009] Further, the connecting part between the piston rod and the cross head is provided with a positioning ring, the end of the positioning ring is provided with an adjusting ring, the connecting part between the positioning ring and the adjusting ring is provided with a screw B, the end of the screw B is provided with a locking nut, the end of the positioning ring is provided with a pressure piston, the end of the pressure piston is provided with a pressure body A, a sealing ring is sleeved between the pressure piston and the pressure body A, the mounting end of the piston rod is provided with a thrust ring, and a connecting spring is embedded in the inside of one end of the thrust ring; the hydraulic coupling fastening device is used for connecting the piston rod and the cross head, mainly composed of a coupling device and a fastening device, after the piston rod and the cross head are connected through the coupling fastening device, the oil with a pressure of 150Mpa is injected into the pressure body A in the fastening device through the manual superhigh pressure oil pump provided with the product, the incompressible property of the liquid is utilized to push the pressure piston, the elastic tensile deformation of the tail of the piston rod is forced, and after the locking nut is locked, the oil is depressurized, and the required pre-tightening force of the connection can be achieved.

[0010] Further, the top side of the adapter is provided with a vent, one end inside the adapter is provided with a stop, and an oil scraper is mounted on the side close to the stop inside the adapter, the one end of the principle stop inside the adapter is filled with packing, and the surface of the adapter away from the vent is provided with a liquid discharge port; the adapter is a cylindrical structure made of cast iron, and has two types of single compartment and double compartment. When compressing flammable, explosive or toxic medium, the double compartment type is adopted, the intermediate sealing packing is mounted at the intermediate compartment, and the leaked gas in the cylinder is prevented from entering the machine body. The top of each chamber is provided with a vent, and the bottom is provided with a liquid discharge port. The chamber close to the cylinder is respectively provided with a nitrogen filling, leakage recovery, oil injection, cooling water connecting flange and joint according to needs, which are used for connecting with external pipelines. The single compartment adapter does not have intermediate sealing packing, and the rest interfaces are provided according to needs. Windows are opened on both sides of the adapter for convenient installation and maintenance. The oil scraper is mounted at the concave partition close to the machine body. The connection between the adapter and the machine body and the cylinder adopts the stop positioning, and the positioning surface sealing adopts anaerobic plane sealant or gasket sealing. The cylinder mainly consists of a cylinder base, a cylinder body and a cylinder cover. The low-pressure stage is mainly a cast iron cylinder, which is provided with a cooling water interlayer. The high-pressure stage cylinder is made of steel and is forged. The cooling water cavity is formed by the hollow cover plates on both sides of the cylinder body and the holes on the cylinder body. The cooling water in the water jacket can lead away heat to improve the working conditions of the cylinder. In order to reduce wear and tear, reduce friction heat and improve the sealing capacity of the piston ring, it is very important to ensure the lubrication of the cylinder, so each cylinder is provided with an oil injection point.

[0011] Further, the pressure body B is internally provided with a pressure body C, and a bolt B is inserted at the connection between the pressure body B and the pressure body C, the bolt B is externally provided with a wrench, and a spacer ring is sleeved at the end connection of the pressure body B; the piston component is composed of a piston body, a piston rod, a piston nut, a piston ring, a support ring and other parts, different numbers of piston rings and support rings are mounted on each piston body, for sealing the compressed medium and supporting the weight of the piston, when the cylinder is lubricated, the piston ring is a cast iron ring or a filled polytetrafluoroethylene plastic ring; a large-diameter piston ring is provided with a spring ring, when the pressure is high, a copper alloy piston ring is used, the support ring is a plastic ring or a bearing alloy cast on the piston body, when the cylinder is oil-free lubricated, the piston ring and the support ring are both filled with polytetrafluoroethylene plastic rings, the support ring structure type is 1200 single piece type, a positioning block installed in the ring groove is used to realize the radial positioning of the support ring, when the piston diameter is small, a whole-circle open support ring is used.

[0012] Further, the first-stage machine body is composed of a first-stage cooler and a first-stage separator, the second-stage machine body is composed of a second-stage cooler and a second-stage separator, the third-stage machine body is composed of a third-stage cooler and a third-stage separator, the fourth-stage machine body is composed of a fourth-stage cooler and a fourth-stage separator, and oil stations and leakage recovery tanks are respectively arranged at both sides of the motor surface; each stage of machine body is matched with corresponding each stage of cooler and each stage of separator to realize the combined operation function of the compressor.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the shaft box whole frame structure, the top is open -ended, the installation of main bearing, crankshaft and connecting rod is convenient, the top opening is split cover plate, and is equipped with breather, makes the inside and outside of fuselage communicate, the fuselage has oil inlet pipe, and lubricating oil enters main bearing lubrication through oil pipe, the lower part of fuselage has no oil tank, reduces the height of fuselage center, increases the stability of unit operation, the upper portion of crankshaft box is equipped with fuselage crossbeam, and the rigidity of crankshaft box is increased, main bearing adopts sliding bearing, and is split up -and -down split -type thin wall tile structure, tile back is carbon steel material, tile face is bearing alloy, and the inner hole of bearing cover is screwed into cylindrical pin, is used for the axial positioning of bearing, and the main bearing close to motor side is positioning bearing, realizes the function of thrust, and the middle body is whole floor type profiling structure, and the rigidity is good, and three drawbars are equipped in upper and lower parts, and straight drawbar is arranged in lower part, and the butt bolt with crankshaft box is arranged reasonably to the maximum, thereby the rigidity and the connecting strength of the middle body are improved, the device is eight rows eight levels counter -balance type, cylinder water -cooling, pressure circulation lubrication, motor drag, each row of cylinder is horizontally arranged and is distributed on both sides of crankshaft, has good dynamic balance, and the operation and maintenance are convenient, the motor adopts double -drive structure, and each side of motor is 4 rows of compressor unit, and the overall structure is optimized, the skew angle of crank of each row is arranged reasonably, the natural frequency of shafting is changed, the torsional vibration of shafting can be effectively reduced, the jumping problem of crankshaft is greatly reduced, thereby the vibration and noise of unit are greatly reduced, the double -drive double 4 rows of symmetric balance type structure makes the first order, second order inertia force and inertia moment be balanced completely, runs more stably, the pipeline system layout is more convenient, reduces the impact of pipeline airflow pulsation, the device is a new product based on further improving technical level on the basis of digesting and absorbing domestic and foreign advanced technology, has the characteristics of advanced design, reasonable structure, reliable performance, stable operation, low power consumption, low noise, small vibration, long service life of wearing parts, easy installation and maintenance etc. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the overall arrangement structure schematic diagram of the utility model of a kind of combined compressor.

[0015] Figure 2 It is the inside structure schematic diagram of the utility model of a kind of combined compressor.

[0016] Figure 3 It is the crankshaft structure schematic diagram of the utility model of a kind of combined compressor.

[0017] Figure 4 It is the connecting rod structure schematic diagram of the utility model of a kind of combined compressor.

[0018] Figure 5 It is the crosshead structure schematic diagram of the utility model of a kind of combined compressor.

[0019] Figure 6The utility model discloses a crosshead and piston rod connecting structure schematic diagram of combined compressor.

[0020] Figure 7 The utility model discloses a single chamber bushing structure schematic diagram of combined compressor.

[0021] Figure 8 The utility model discloses a piston rod and piston connecting structure schematic diagram of combined compressor.

[0022] In the drawing: 1, motor;101, primary fuselage;102, secondary fuselage;103, tertiary fuselage;104, four-stage fuselage;105, thin oil station;106, primary cooler;107, primary separator;108, secondary cooler;109, secondary separator;110, tertiary cooler;111, tertiary separator;112, four-stage cooler;113, four-stage separator;114, leakage recovery tank;115, fuselage;2, middle body;3, fuselage;4, oil inlet pipe;5, crossbeam;6, main bearing bush;7, connecting stud;8, cover plate;9, fuselage footing;10, middle body footing;11, main journal;12, crank arm;13, crank pin;14, positioning main journal;15, oil baffle cover;16, sealing element;17, flange plate;18, positioning stop;19, connecting rod bolt;20, connecting rod nut;21, connecting rod;22, big end bush;23, positioning pin;24, small end sleeve;25, crosshead;26, slide shoe;27, pin;28, gland;29, bolt A;30, nut;31, O-ring;32, screw A;33, key;34, positioning ring;35, adjusting ring;36, screw B;37, lock nut;38, pressure piston;39, sealing ring;40, pressure body A;41, connecting spring;42, thrust ring;43, piston rod;44, bushing;45, venting port;46, oil scraper;47, stop;48, packing;49, liquid discharge port;50, pressure body B;51, pressure body C;52, bolt B;53, wrench;54, spacer ring. DETAILED DESCRIPTION

[0023] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0024] As Figures 1-8As shown, a combined compressor includes a motor 1, and further includes a first machine body 101, a second machine body 102, a third machine body 103, a fourth machine body 104, a machine body 115, a middle body 2, a machine body 3, a connecting rod 21, a cross head 25, a piston rod 43, a sleeve 44, a pressure body B 50 and a pressure body C 51, a power output end of the motor 1 is provided with the first machine body 101, the second machine body 102, the third machine body 103 and the fourth machine body 104 through the machine body 115, the machine body 115 is composed of the middle body 2 and the machine body 3, the machine body 3 is provided with the middle body 2 on both sides and is provided with an oil inlet pipe 4 on one side in the inside of the machine body 3, a cross beam 5 is provided on the top end in the inside of the machine body 3 and a main bearing bush 6 is installed in the inside of the machine body 3, a connecting stud 7 is provided on the installation end of the main bearing bush 6 and a cover plate 8 is clamped on the top of the machine body 3, the surface of the machine body 3 and the surface of the middle body 2 are respectively provided with a machine body footing 9 and a middle body footing 10.

[0025] The crankshaft is composed of the main shaft neck 11, the crank pin 13 and the crank arm 12, the opposite column crank arms are 180°, the power input end of the crankshaft is provided with the flange 17, the flange 17 is integrated with the crankshaft, the input torque is transmitted by the friction force generated on the connecting surface of the flange 17, the axial positioning of the crankshaft is completed by the positioning ring 34 and the main bearing on the first main shaft neck 11, so as to prevent the axial movement of the crankshaft, the positioning end is provided with the axial thermal expansion gap, the outer side of the positioning main shaft neck 14 is provided with the oil thrower, when the shaft end penetrates through the rear cover of the machine body, the felt is used as the oil seal, the crankshaft is the integral solid structure made of steel, the oil hole is not drilled in the shaft body, so as to reduce the stress concentration phenomenon, the connecting rod 21 is composed of the connecting rod body and the big end bush 22, the two are connected into an integral whole by the two connecting rod bolts 19, the big end bush 22 is the split thin arm bush, the back material of the bush is the carbon steel, the surface of the bush is the bearing alloy, the inside surface of the big end hole is inlaid with the cylindrical pin, which is used for the axial positioning of the big end bush 22 and prevents the rotation of the bush, the connecting rod 21 adopts the small end positioning mode, which is convenient and fast, the small end of the connecting rod 21 and the small end sleeve 24 are the integral whole, the bush material is the tin bronze, the oil hole is drilled in the connecting rod body along the axial direction of the rod body and is communicated with the ring groove of the big end and small end bush back, the lubricating oil can be communicated through the annular groove and the radial oil hole on the bush to realize the lubrication of the cross head 25 pin and the crank pin 13, in order to ensure the safe and reliable transmission of the alternating load of the connecting rod, the hydraulic fastening connection mode is adopted, the connecting rod bolt 19 must have sufficient pre-tightening force, the size of the pre-tightening force is ensured by the elongation of the connecting rod bolt 19 after fastening, the connecting rod 21, the big end bush 22 and the connecting rod bolt 19 are made of alloy structural steel.

[0026] The cross head 25 is surface-mounted with the slide shoe 26, and the cross head 25 and the slide shoe 26 are connected through the pin 27. The bolt A 29 is inserted into the cross head 25, and the nut 30 is surface-connected with the bolt A 29. The gland 28 is installed on the surface of the cross head 25 close to the nut 30 side, and the O-ring 31 is sleeved on the outer periphery of the bolt A 29 installation side. The screw A 32 is installed between the cross head 25 and the slide shoe 26, and the key 33 is installed on the internal connection end of the cross head 25. The cross head 25 is a double-sided cylindrical split combined structure. The cross head 25 body and the upper and lower two detachable slide shoes 26 are positioned by tenon and groove, and are connected into an integral body by means of screws. The adjusting washer is installed between the slide shoe 26 and the cross head 25. Since the directions of the lateral forces of the cross heads 25 on both sides of the machine body 3 are opposite, in order to ensure the concentricity of the cross head 25 and the piston rod 43 during operation, the number of washers between the cross head 25 and the slide shoe 26 is adjusted during assembly. The lining back material of the slide shoe 26 is carbon steel, the pressure-bearing surface is hung with bearing alloy, and an oil groove is opened to facilitate the distribution of lubricating oil.

[0027] The positioning ring 34 is installed at the connection between the piston rod 43 and the cross head 25, and the adjusting ring 35 is installed at the end of the positioning ring 34. The screw B 36 is installed at the connection between the positioning ring 34 and the adjusting ring 35, and the locking nut 37 is installed at the end of the screw B 36. The pressure piston 38 is arranged at the end of the positioning ring 34, and the pressure body A 40 is arranged at the end of the pressure piston 38. The sealing ring 39 is sleeved between the pressure piston 38 and the pressure body A 40. The thrust ring 42 is arranged at the installation end of the piston rod 43, and the connecting spring 41 is embedded in one end inside the thrust ring 42. The hydraulic coupling fastening device is used for connecting the piston rod 43 and the cross head 25, mainly composed of a coupling device and a fastening device. After the piston rod 43 and the cross head 25 are connected through the coupling fastening device, the oil with a pressure of 150Mpa is injected into the pressure body A 40 in the fastening device by using the manual super-high-pressure oil pump which is randomly taken with the product. By using the incompressible nature of liquid, the pressure piston 38 is pushed, and the elastic tensile deformation of the tail of the piston rod 43 is forced. After the locking nut 37 is locked, the oil is released, and the required pre-tightening force for connection can be achieved.

[0028] Among them, a vent 45 is provided on one side of the top of the connecting tube 44, a stop 47 is provided on one end of the inside of the connecting tube 44, and an oil scraper 46 is installed on the side of the connecting tube 44 near the stop 47, a filler 48 is filled on one end of the inside of the connecting tube 44, and a drain port 49 is provided on the surface of the connecting tube 44 away from the vent 45; the connecting tube 44 is a cylindrical structure made of cast iron, and is divided into two types: single compartment and double compartment. When compressing flammable, explosive or toxic media, the double compartment type is adopted, and an intermediate sealing filler 48 is installed in the middle compartment to prevent the leaked gas in the cylinder from entering the fuselage 3. A vent 45 is provided on the top of each chamber, and a drain port 49 is provided on the bottom. The chambers on the cylinder side are provided with nitrogen filling, gas leakage recovery, oil injection, and cooling water connection flanges and joints as needed for connecting with the outside For the connection of internal pipelines, the single-compartment connecting tube 44 is not provided with an intermediate sealing filler 48, and the remaining interfaces are set as needed. Windows are opened on both sides of the connecting tube 44 for easy installation and maintenance. An oil scraper 46 is installed at the concave partition on the side of the fuselage 3. The connection between the connecting tube 44 and the fuselage 3 and the cylinder is positioned by a stop 47, and the positioning surface is sealed with an anaerobic flat sealant or a gasket. The cylinder is mainly composed of three parts: a cylinder seat, a cylinder body, and a cylinder head. The low-pressure stage is mostly a cast iron cylinder with a cooling water interlayer. The high-pressure stage cylinder is forged with steel parts, and a cooling water cavity is formed by the hollow cover plates 8 on both sides of the cylinder body and the channels on the cylinder body. The cooling water in the water jacket can conduct heat to improve the working conditions of the cylinder. It is very important to reduce wear, reduce friction heat, improve the sealing ability of the piston ring, and ensure cylinder lubrication. Therefore, all levels of cylinders are provided with oiling points.

[0029] Among them, the pressure body B50 has a built-in pressure body C51 and a bolt B52 is inserted at the connection between the pressure body B50 and the pressure body C51. A wrench 53 is installed on the outer periphery of the bolt B52, and a spacer 54 is sleeved at the connection of the end of the pressure body B50; the piston component is composed of a piston body, a piston rod 43, a piston nut 30, a piston ring, a support ring and other parts. Each level of the piston body is equipped with a different number of piston rings and support rings for sealing the compressed medium and supporting the weight of the piston. When the cylinder is oil-filled and lubricated, the piston ring is a cast iron ring or a polytetrafluoroethylene (PTFE)-filled plastic ring; the large-diameter piston ring is equipped with an elastic ring. When the pressure is high, a copper alloy piston ring is used. The support ring is a plastic ring or a bearing alloy is directly cast on the piston body. When the cylinder is not oil-lubricated, the piston ring and the support ring are all polytetrafluoroethylene (PTFE)-filled plastic rings. The support ring structure is 1200 single-piece, and a positioning block installed in the ring groove is used to achieve radial positioning of the support ring. When the piston diameter is small, a full-circle open support ring is used.

[0030] The first stage fuselage 101 is composed of a first stage cooler 106 and a first stage separator 107, and the second stage fuselage 102 is composed of a second stage cooler 108 and a second stage separator.

[0031] 109, the three-stage body 103 is composed of a three-stage cooler 110 and a three-stage separator

[0032] 111, the four-stage body 104 is composed of a four-stage cooler 112 and a four-stage separator 113, and the motor 1 is provided with an oil dilution station 105 and a leakage recovery tank 114 on both sides of the surface; each stage body is matched with the corresponding cooler and separator to realize the combined operation of the compressor.

[0033] It should be noted that the utility model is a kind of combined compressor, when using, shaft box integral frame structure, top is open type, it is convenient for the installation of main bearing, crankshaft and connecting rod, top opening is split cover plate 8, and is equipped with breather, so that the inside of the body is communicated with atmosphere, oil inlet pipe 4 is in the body, lubricating oil enters main bearing lubrication through oil pipe, the lower part of the body is without oil tank, reduce the height of body center, increase the stability of unit operation, the upper part of crankcase is provided with body crossbeam 5, increase the rigidity of crankcase, main bearing adopts sliding bearing, for split upper and lower split open thin wall tile structure, tile back is carbon steel material, tile surface is bearing alloy, cylindrical pin is screwed into bearing cover inner hole, for the axial positioning of bearing, the main bearing close to motor 1 side is positioning bearing, realizes the function of thrust, middle body 2 is integral floor type profiling structure, good rigidity, upper and lower parts are provided with three pull bars, lower part is provided with straight pull bar, and butt bolt with crankcase is arranged reasonably to maximum, so as to improve the rigidity and connection strength of middle body 2, the device is eight rows eight levels counter dynamic balance type, cylinder water cooling, pressure circulation lubrication, motor 1 dragging, each row of cylinder is horizontally arranged and is distributed on both sides of crankshaft, has the advantages of good dynamic balance, convenient operation and maintenance, motor 1 adopts double drive structure, each side of motor 1 is 4 rows of compressor unit, optimizes overall structure, reasonably arranges the skew angle of crank of each row, changes the natural frequency of shafting, can effectively reduce the torsional vibration of shafting, greatly reduces the jumping problem of crankshaft, so as to greatly reduce the vibration and noise of unit, double 4 rows of symmetric balance type structure makes first-order inertia force and inertia moment be completely balanced, runs more stably, pipeline system layout is more convenient, reduces the impact of pipeline airflow pulsation, the device is a new product for further improving technical level on the basis of digesting and absorbing advanced technology at home and abroad, has the characteristics of advanced design, reasonable structure, reliable performance, stable operation, low power consumption, low noise, small vibration, long service life of wearing parts, easy installation and maintenance.

[0034] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A combined compressor, comprising a motor (1), characterized in that: It also includes a first-stage fuselage (101), a second-stage fuselage (102), a third-stage fuselage (103), a fourth-stage fuselage (104), a body (115), a middle body (2), a body (3), a connecting rod (21), a crosshead (25), a piston rod (43), a connecting sleeve (44), a pressure body B (50) and a pressure body C (51). The power output end of the motor (1) is equipped with the first-stage fuselage (101), the second-stage fuselage (102), the third-stage fuselage (103) and the fourth-stage fuselage (104) through the body (115). The body (115) is composed of a middle body (2) and a fuselage (3), the middle body (2) is provided on both sides of the fuselage (3), and an oil inlet pipe (4) is provided on one side of the fuselage (3), a cross beam (5) is provided at the top end of the fuselage (3), and a main bearing (6) is installed inside the fuselage (3), a connecting stud (7) is provided at the mounting end of the main bearing (6), and a cover plate (8) is clamped on the top of the fuselage (3), and a fuselage foot (9) and a middle body foot (10) are provided on the surface of the fuselage (3) and the surface of the middle body (2), respectively.

2. A combined compressor according to claim 1, characterized in that: A main journal (11) and a positioning main journal (14) connected to the main bearing (6) are installed inside the fuselage (3); a crank arm (12) and a crank pin (13) are integrally formed between the main journal (11) and the positioning main journal (14); a flange (17) and a positioning stop (18) are provided at the end of the positioning main journal (14); a large head journal (22) is installed at the end of the connecting rod (21); and a connecting rod bolt (19) and a connecting rod nut (20) are detachably connected between the connecting rod and the large head journal (22); a positioning pin (23) and a small head sleeve (24) are respectively provided at both ends of the connecting rod (21); and an oil retaining cover (15) and a sealing member (16) are provided on the periphery of the positioning main journal (14).

3. A combined compressor according to claim 2, characterized in that: A sliding shoe (26) is installed on the surface of the crosshead (25) and the crosshead (25) and the sliding shoe (26) are connected by a pin (27). A bolt A (29) is inserted into the interior of the crosshead (25) and a nut (30) is connected to the surface of the bolt A (29). A pressure cover (28) is installed on the side of the crosshead (25) close to the nut (30) and an O-ring (31) is sleeved on the outer periphery of the installation side of the bolt A (29). A screw A (32) is installed between the crosshead (25) and the sliding shoe (26), and a key (33) is installed on the internal connection end of the crosshead (25).

4. A combined compressor according to claim 3, characterized in that: A positioning ring (34) is installed at the connection between the piston rod (43) and the crosshead (25), and an adjusting ring (35) is installed at the end of the positioning ring (34). A screw B (36) is installed at the connection between the positioning ring (34) and the adjusting ring (35), and a locking nut (37) is installed at the end of the screw B (36). A pressure piston (38) is provided at the end of the positioning ring (34), and a pressure body A (40) is provided at the end of the pressure piston (38). A sealing ring (39) is sleeved between the pressure piston (38) and the pressure body A (40). A thrust ring (42) is provided at the installation end of the piston rod (43), and a connecting spring (41) is embedded in one end of the thrust ring (42).

5. A combined compressor according to claim 4, characterized in that: A vent (45) is provided on one side of the top of the connecting tube (44), a stopper (47) is provided on one end of the interior of the connecting tube (44), and an oil scraper (46) is installed on the side of the interior of the connecting tube (44) close to the stopper (47), a filler (48) is filled on one end of the interior of the connecting tube (44) away from the stopper (47), and a drain port (49) is provided on the surface of the connecting tube (44) away from the vent (45).

6. A combined compressor according to claim 5, characterized in that: The pressure body B (50) has a built-in pressure body C (51) and a bolt B (52) is inserted into the connection between the pressure body B (50) and the pressure body C (51). A wrench (53) is installed on the outer periphery of the bolt B (52). A spacer (54) is sleeved on the connection of the end of the pressure body B (50).

7. A combined compressor according to claim 6, characterized in that: The first-stage body (101) is composed of a first-stage cooler (106) and a first-stage separator (107); the second-stage body (102) is composed of a second-stage cooler (108) and a second-stage separator (109); the third-stage body (103) is composed of a third-stage cooler (110) and a third-stage separator (111); the fourth-stage body (104) is composed of a fourth-stage cooler (112) and a fourth-stage separator (113); and a thin oil station (105) and a gas leakage recovery tank (114) are respectively provided on both sides of the surface of the motor (1).

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