CN111022293A - With CO2Transcritical reciprocating piston compressor as refrigerant - Google Patents

With CO2Transcritical reciprocating piston compressor as refrigerant Download PDF

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Publication number
CN111022293A
CN111022293A CN201911307120.5A CN201911307120A CN111022293A CN 111022293 A CN111022293 A CN 111022293A CN 201911307120 A CN201911307120 A CN 201911307120A CN 111022293 A CN111022293 A CN 111022293A
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CN
China
Prior art keywords
piston
machine body
cavity
cylinder
valve plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911307120.5A
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Chinese (zh)
Inventor
赵东华
杨长军
张显鹏
夏咸雨
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Nanjing Jiuding Fine Machinery Refrigeration Equipment Co Ltd
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Nanjing Jiuding Fine Machinery Refrigeration Equipment Co Ltd
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Application filed by Nanjing Jiuding Fine Machinery Refrigeration Equipment Co Ltd filed Critical Nanjing Jiuding Fine Machinery Refrigeration Equipment Co Ltd
Priority to CN201911307120.5A priority Critical patent/CN111022293A/en
Publication of CN111022293A publication Critical patent/CN111022293A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B27/0404—Details, component parts specially adapted for such pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B27/0404—Details, component parts specially adapted for such pumps
    • F04B27/0409—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B27/0404—Details, component parts specially adapted for such pumps
    • F04B27/0423—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B27/047—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with an actuating element at the outer ends of the cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F04B39/102—Adaptations or arrangements of distribution members the members being disc valves

Abstract

The invention relates to a method for preparing a catalyst from CO2Transcritical reciprocating piston compressor as refrigerant, including the organism, the fuselage top both sides of organism are crisscross respectively and are equipped with the cylinder head, the inside cylinder that is equipped with of organism, the inside piston that is equipped with of cylinder, the bearing frame is installed to the one end of organism, the motor lid is installed to the other end of organism, the inner chamber of organism constitutes confined cavity with bearing frame and motor lid, the cavity of organism includes motor case, crankcase and compression chamber, the motor case is located the one side that is close to the motor lid, the crankcase is located the one side that is close to the bearing frame, the inside of crankcase is equipped with the bent axleThe axle box is connected with the motor box through a crankshaft, a motor in the motor box drives the crankshaft to do rotary motion, the crankshaft is in transmission connection with a piston, a valve plate is arranged inside a compression cavity and placed at the top of the cylinder, and when the piston does reciprocating motion, corresponding air suction and exhaust are completed. The piston compressor has higher efficiency than other types of compressors under the working condition of large pressure difference.

Description

With CO2Transcritical reciprocating piston compressor as refrigerant
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a refrigerant using CO2Transcritical reciprocating piston compressors as refrigerants.
Background
CO2The history as a refrigerant medium can be traced back to more than 100 years ago. As early as 1866, laddeus s.c. lowe in the united states first utilized CO2Making ice, albeit CO2Is not the only early refrigeration working medium, but because of its non-toxicity and non-flammability, CO is used in the fields of food industry and civil building air-conditioning2Refrigeration devices take a major position. In the 30 s of the 20 th century, CO was produced due to the emergence of chlorofluorocarbon refrigerant2Is quickly replaced.
In the field of refrigeration and air conditioning, the refrigerants used at present are mainly freon refrigerants, and the freon refrigerants are limited by various countries and are gradually eliminated because the freon refrigerants cause ozone layer cavities and atmospheric greenhouse effect. As a refrigerant medium which has been used and has proven to be environmentally friendly, CO has been used in recent years2But also arouses the attention of people. Among the several common natural working fluids, CO can be said2Most competitive, CO, where flammability and toxicity are severely limited2Is most desirable.
Transcritical CO2CO when the compressor is operating above the critical point2The highest exhaust pressure of the compressor can reach 14MPa, the highest high-low pressure difference can reach 10MPa, the larger the pressure difference is, the larger the leakage rate of the compressor is, and the high requirements on the design, manufacture and assembly of the compressor are provided. Transcritical CO2The compressor operates at high temperature and high pressure, and the material strength and the sealing of the system need to be specially designed for the compressor.
Disclosure of Invention
The invention aims to provide a catalyst prepared from CO2A transcritical reciprocating piston compressor as a refrigerant to solve the problems encountered in the background art as described above.
In order to achieve the purpose, the technical scheme of the invention is as follows:
with CO2The transcritical reciprocating piston compressor used as the refrigerant comprises a machine body, wherein cylinder covers are respectively arranged on two sides of the top of the machine body in a staggered mode, a cylinder is arranged inside the machine body, a piston is arranged inside the cylinder, a bearing seat is arranged at one end of the machine body, a motor cover is arranged at the other end of the machine body, an inner cavity of the machine body, the bearing seat and the motor cover form a closed cavity, a motor box, a crank box and a compression cavity are arranged inside the machine body, the motor box is located on one side close to the motor cover, the crank box is located on one side close to the bearing seat, a crank shaft and a connecting rod are arranged inside the crank box, the crank box is connected with the motor box through the crank shaft, a rotor in the motor box drives the crank shaft to rotate, the crank shaft is in transmission connection with the connecting rod, The piston reciprocates in the cylinder, and the valve plate is placed at the top of the cylinder, and when the piston reciprocates, corresponding air suction and exhaust are completed.
In the scheme, the top of the valve plate is provided with the exhaust valve plate, the opening of the exhaust valve plate corresponds to the exhaust of each cylinder, and the thickness of the exhaust valve plate is 0.3-0.4 mm; the bottom of the valve plate is provided with an air suction valve plate, the opening of the air suction valve plate corresponds to air suction of each air cylinder, and the thickness of the air suction valve plate is 0.5-0.8 mm.
In the above scheme, the top of the machine body is provided with the junction box, the motor box is internally provided with the rotor and the stator, the crankshaft is fixedly connected with the rotor through a flat key, the rotor is rotatably connected with the stator, and the stator is in interference fit with the inner wall of the machine body.
In the above scheme, the crankshaft is further provided with a crank throw in the crankcase, the crank throw is arranged on the crankshaft by 180 degrees, the crank throw is in transmission connection with a connecting rod in a matching manner, one end of the connecting rod is connected with a large-head bearing bush, the large-head bearing bush is fixedly connected with the crankshaft, the other end of the connecting rod is connected with a small-head bearing bush, and the small-head bearing bush is in transmission connection with the piston through a piston pin.
In the scheme, two ends of the connecting rod are respectively connected with the big-end bearing bush and the small-end bearing bush in an interference fit mode, the big-end bearing bush and the small-end bearing bush are both made of lead bronze, and the inner diameters of the big-end bearing bush and the small-end bearing bush are provided with PTFE red coatings.
In the scheme, the compression cavity comprises a high-pressure cavity and a low-pressure cavity, the high-pressure cavity is positioned in an inner cavity of the top of the machine body close to the bearing seat, the high-pressure cavity is communicated with the interior of the cylinder cover, one side of the top of the machine body is provided with an exhaust valve and a safety valve which are communicated with the high-pressure cavity, and the diameter of the valve cavity is 16-22 mm; the low-pressure cavity is positioned in an inner cavity of the top of the machine body close to the motor cover and communicated with the inner cavity of the machine body, an air suction valve communicated with the low-pressure cavity is arranged on the other side of the top of the machine body, and the diameter of the valve cavity is 25-32 mm.
In the above scheme, the maximum working pressure of the high-pressure cavity is 150bar, the wall thickness of the high-pressure cavity is 25-30mm, the maximum working pressure of the low-pressure cavity is 100bar, and the wall thickness of the low-pressure cavity is 12-15 mm.
In the scheme, two cylinders are arranged on each side of the machine body, the machine body is arranged in a V shape, and the angle formed by the two cylinders and the axis of the machine body in the vertical direction is 40 degrees.
In the scheme, the machine body is formed by casting ductile iron in an integrated mode, the wall thickness of the machine body is 12-30mm, the working pressure of the machine body is 40-145 bar, and a plurality of groups of rib plates are arranged on two sides, close to the motor box, of the outer portion of the machine body respectively.
In the scheme, the piston is made of aluminum alloy and is treated by adopting an anodic oxidation process, three piston rings are arranged on the peripheral surface of the piston, the diameter of the piston is 35-55mm, and the stroke of the piston is 25-35 mm.
Compared with the prior art, the invention has the beneficial effects that: the piston compressor has a wide application pressure range because the pressure bearing capacity of the shell is higher than that of the traditional shell, and the piston compressor can be designed into different pressure ranges; the process of the piston compressor for compressing gas belongs to a closed system, and the compression efficiency is higher; the piston compressor adopts a plurality of piston rings, and has higher efficiency than other forms of compressors under the working condition of large pressure difference; the two ends of the connecting rod of the piston compressor adopt PTFE red coatings, so that the friction coefficient is reduced, and the efficiency of the compressor is higher; the piston of the piston compressor adopts the anodic oxidation process, so that the piston is more wear-resistant, and the service life of the compressor is indirectly prolonged.
Drawings
FIG. 1 is a front view of the overall structure of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;
FIG. 3 is a side view of the overall structure of the present invention;
fig. 4 is a schematic structural view of a section B-B in fig. 3.
Reference numbers in the figures: 1-body; 11-a cylinder head; 12-a bearing seat; 13-motor cover; 14-a cylinder; 15-rib plate; 16-a piston; 2-a motor box; 21-a junction box; 22-a crankshaft; 23-a rotor; 24-a stator; 3-a crankcase; 31-crank throw; 32-connecting rod; 33-big head bearing bush; 34-small end bearing bush; 35-piston pin; 4-a compression chamber; 41-high pressure chamber; 411-an exhaust valve; 412-a safety valve; 42-low pressure chamber; 421-an air suction valve; 43-a valve plate; 44-a vent valve plate; 45-air suction valve plate.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and examples.
As shown in FIGS. 1 to 4, a catalyst prepared with CO2A transcritical reciprocating piston compressor used as a refrigerant comprises a machine body 1, wherein cylinder covers 11 are respectively arranged on two sides of the top of the machine body 1 in a staggered mode, and the cylinder covers 11 realize high-pressure and low-pressure CO isolation2A gas. The inside cylinder 14 that is equipped with of organism 1, cylinder 14 every side is equipped with two, is the V type on the both sides of organism 1 side and arranges, and its and the axis of organism 1 vertical direction constitute the angle be 40 degrees. The piston 16 is arranged in the cylinder 14, the piston 16 is made of aluminum alloy and is treated by an anodic oxidation process, so that the piston 16 is more wear-resistant, the service life of the cylinder 14 is prolonged, and the service life of the compressor is indirectly prolonged. Three piston rings are arranged on the peripheral surface of the piston 16, the diameter of the piston 16 is 35-55mm, and the stroke of the piston is 25-35 mm. Of course, the transcritical compressor design piston diameter may be set at 36, 41, 50, 55 with a stroke set at 26, 31 mm. By designing smaller activitiesThe diameter and stroke of the plug 16 reduce the friction work of the compressor and reduce the compressor discharge temperature in order to improve the volumetric efficiency of the compressor.
Bearing frame 12 is installed to the one end of organism 1, and motor lid 13 is installed to the other end of organism 1, and the inner chamber of organism 1 constitutes confined cavity with bearing frame 12 and motor lid 13. The compressor body 1 is formed by integrally casting ductile iron, and is formed by integrally casting ductile iron 500-7, and all other parts are installed through the compressor body, so that the compactness of the compressor is ensured to the maximum extent. The wall thickness of the machine body 1 is 12-30mm and is used for reducing heat transfer, the working pressure of the machine body 1 is 40 bar-150 bar, a plurality of groups of rib plates 15 are respectively arranged on two sides of the outer portion of the machine body 1, which are close to the motor box 2, reinforcing ribs are added at proper positions, and the pressure bearing capacity of the shell is improved.
Be equipped with motor case 2, compression chamber 3 and crankcase 4 in organism 1's the cavity, motor case 2 is located the one side that is close to motor cover 13, and crankcase 4 is located the one side that is close to bearing frame 12. The crank shaft 22 and the connecting rod 32 are arranged in the crank case 4, the crank case 4 is connected with the motor case 2 through the crank shaft 22, the rotor 23 in the motor case 2 drives the crank shaft 22 to do rotary motion, the crank shaft 22 is in transmission connection with the connecting rod 32, the connecting rod 32 is in transmission connection with the piston 16 through the piston pin 35, the compression cavity 3 is composed of the cylinder 14, the piston 16 and the valve plate 43, the piston 16 does reciprocating motion in the cylinder 14, the valve plate 43 is placed at the top of the cylinder 14, and when the piston 16 does reciprocating motion, corresponding air suction and exhaust are completed.
The top of the valve plate 43 is provided with an exhaust valve plate 44, the opening of the exhaust valve plate 44 corresponds to the exhaust of each cylinder, and the thickness of the exhaust valve plate 44 is 0.3-0.4mm, preferably 0.3 mm; the bottom of the valve plate 43 is provided with an air suction valve plate 45, the opening of the air suction valve plate 45 corresponds to the air suction of each air cylinder, and the thickness of the air suction valve plate 45 is 0.5-0.8mm, preferably 0.6 mm.
The top of organism 1 is equipped with terminal box 21 that is used for connecting external power source, is equipped with rotor 23 and stator 24 in the motor case 2, and bent axle 22 passes through flat key and rotor 23 fixed connection, and rotor 23 rotates with stator 24 to be connected, and stator 24 and the inner wall interference fit of organism 1.
The crank throw 31 is further mounted in the crank case 4 of the crank shaft 22, lubricating oil is stored at the bottom of the crank case 4, the crank throw 31 is arranged on the crank shaft 22 at an angle of 180 degrees, the crank throw 31 is in transmission connection with the connecting rod 32 in a matching mode, one end of the connecting rod 32 is connected with the large-head bearing bush 33, the large-head bearing bush 33 is in transmission connection with the crank shaft 22, the other end of the connecting rod 32 is connected with the small-head bearing bush 34, and the small-head bearing bush 34 is in transmission connection with the piston 16 through. As a preferred scheme, two ends of the connecting rod 32 are respectively connected with the big-end bearing bush 33 and the small-end bearing bush 34 in an interference fit mode, the big-end bearing bush 33 and the small-end bearing bush 34 are both made of lead bronze, and PTFE red coatings are arranged on the inner diameters of the big-end bearing bush 33 and the small-end bearing bush 34, so that the wear resistance is effectively improved.
The compression cavity 3 comprises a high pressure cavity 41 and a low pressure cavity 42, the high pressure cavity 41 is positioned in the top inner cavity of the machine body 1 close to the bearing seat 12, the high pressure cavity 41 is communicated with the inside of the cylinder cover 11, one side of the top of the machine body 1 is provided with an exhaust valve 411 and a safety valve 412 which are communicated with the high pressure cavity 41, and the diameter of the valve cavity is 16-22 mm; the low pressure cavity 42 is positioned in the top inner cavity of the machine body 1 close to the motor cover 13, the low pressure cavity 42 is communicated with the inner cavity of the machine body 1, the other side of the top of the machine body 1 is provided with an air suction valve 421 communicated with the low pressure cavity 42, the diameter of the valve cavity is 25-32mm, the clearance volume is reduced, and the efficiency of the compressor is improved. The strength of the valve plate is increased, the valve plate is prevented from bending deformation and even breaking under high pressure difference, meanwhile, the sealing performance of the valve plate is improved, and the volumetric efficiency of the compressor is improved.
The maximum working pressure of the high-pressure cavity 41 is 150bar, the wall thickness of the high-pressure cavity 41 is 25-30mm, the preferable wall thickness is 28mm, the pressure bearing is guaranteed to be 15MPa, the heat transfer temperature difference is reduced, and the isentropic efficiency is improved. The maximum working pressure of the low-pressure chamber 42 is 100bar and the wall thickness of the low-pressure chamber 42 is 12-15 mm. The preferable wall thickness is 14mm, and the design pressure-bearing capacity is 10 MPa. The compression chamber is for CO2A mechanism for the process of suction-compression-discharge of gas.
The compressor completes the processes of air suction and exhaust mainly through the up-and-down movement of the piston 16, and the high-pressure side of the compressor is sealed by the piston 16 and a piston ring, so that the high-pressure side inevitably leaks to the low-pressure side. The maximum high-low pressure difference of the transcritical compressor can reach 12MPa, and the maximum subcritical compressor is only 5-6MPa, so that 3 piston rings are used for sealing transcritical, the sealing performance of the piston compressor is improved, and the compression efficiency of the piston compressor is improved.
The working process of the compressor is as follows: low temperature low pressure CO2Gas enters the motor box 2 through the suction valve 421, the motor rotor 23 and the stator 24 are cooled firstly, and low-temperature and low-pressure CO is generated2The gas enters the suction cavity in the machine body 1 and the low-pressure side of the cylinder cover 11, the rotor 23 drives the crankshaft 22 to rotate, and the crankshaft 22 drives the piston 16 and the connecting rod 32 to reciprocate through the crank throw 31. When the piston 16 moves downwards, the pressure in the cylinder 14 is lower than the external pressure, the air suction valve plate 45 is opened, and the CO at low temperature and low pressure2Gas is sucked into the cylinder 14 to complete the air suction process; when the piston 16 moves upwards, low-temperature and low-pressure CO is in the cylinder 142The gas is compressed into high-temperature high-pressure CO2When the pressure in the gas cylinder 14 is higher than the external pressure, the exhaust valve plate 44 is opened, CO2Gas is discharged into the high-pressure side in the cylinder cover 11 and the exhaust cavity of the machine body 1, and the compression and exhaust processes are completed; CO in exhaust chamber of body 12The gas is vented through a vent valve 411 to allow the compressor to complete the cycle.
The piston compressor has a wide application pressure range because the pressure bearing capacity of the shell is higher than that of the traditional shell, and the piston compressor can be designed into different pressure ranges; the process of the piston compressor for compressing gas belongs to a closed system, and the compression efficiency is higher; the piston compressor adopts a plurality of piston rings, and has higher efficiency than other forms of compressors under the working condition of large pressure difference; the two ends of the connecting rod 32 of the piston compressor adopt PTFE red coatings, so that the friction coefficient is reduced, and the efficiency of the compressor is higher; the piston 16 in the piston compressor adopts the anodic oxidation process, so that the piston 16 is more wear-resistant, and the service life of the compressor is indirectly prolonged.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. With CO2Transcritical reciprocating piston compressor as refrigerant, including organism (1), the fuselage top both sides of organism (1) are crisscross cylinder head (11) of being equipped with respectively, inside cylinder (14) of being equipped with of organism (1), inside piston (16) of being equipped with of cylinder (14), bearing frame (12) are installed to the one end of organism (1), motor cover (13) are installed to the other end of organism (1), its characterized in that: the inner cavity of the machine body (1), a bearing seat (12) and a motor cover (13) form a closed cavity, a motor box (2), a compression cavity (3) and a crankcase (4) are arranged in the cavity of the machine body (1), the motor box (2) is positioned on one side close to the motor cover (13), the crankcase (4) is positioned on one side close to the bearing seat (12), a crankshaft (22) and a connecting rod (32) are arranged inside the crankcase (4), the crankcase (4) is connected with the motor box (2) through the crankshaft (22), a rotor (23) in the motor box (2) drives the crankshaft (22) to do rotary motion, the crankshaft (22) is in transmission connection with the connecting rod (32), the connecting rod (32) is in transmission connection with a piston (16) through a piston pin (35), and the compression cavity (3) is formed by a cylinder (14), a piston (16) and a valve plate (43), the piston (16) reciprocates in the cylinder (14), the valve plate (43) is placed at the top of the cylinder (14), and corresponding air suction and exhaust are completed when the piston (16) reciprocates.
2. A CO-based composition according to claim 12A transcritical reciprocating piston compressor as a refrigerant characterized by: the top of the valve plate (43) is provided with an exhaust valve plate (44), the opening of the exhaust valve plate (44) corresponds to the exhaust of each cylinder (14), and the thickness of the exhaust valve plate (44) is 0.3-0.4 mm; the bottom of the valve plate (43) is provided with an air suction valve plate (45), the opening of the air suction valve plate (45) corresponds to air suction of each air cylinder (14), and the thickness of the air suction valve plate (45) is 0.5-0.8 mm.
3. A CO-based composition according to claim 12A transcritical reciprocating piston compressor as a refrigerant characterized by: the top of the machine body (1) is provided with a junction box (21), a rotor (23) and a stator (24) are arranged in the motor box (2), the crankshaft (22) is fixedly connected with the rotor (23) through a flat key, and the rotor (23) and the statorThe stator (24) is connected in a rotating mode, and the stator (24) is in interference fit with the inner wall of the machine body (1).
4. A CO-based composition according to claim 12A transcritical reciprocating piston compressor as a refrigerant characterized by: the crank shaft (22) is further provided with a crank throw (31) in the crank case (4), the crank throw (31) is arranged on the crank shaft (22) at 180 degrees, the crank throw (31) is in transmission connection with a connecting rod (32) in a matching mode, one end of the connecting rod (32) is connected with a large-head bearing bush (33), the large-head bearing bush (33) is in transmission connection with the crank shaft (22), the other end of the connecting rod (32) is connected with a small-head bearing bush (34), and the small-head bearing bush (34) is in transmission connection with a piston (16) through a piston pin (35).
5. A CO-based catalyst according to claim 42A transcritical reciprocating piston compressor as a refrigerant characterized by: the two ends of the connecting rod (32) are respectively connected with the big-end bearing bush (33) and the small-end bearing bush (34) in an interference fit mode, the big-end bearing bush (33) and the small-end bearing bush (34) are both made of lead bronze, and the inner diameters of the big-end bearing bush and the small-end bearing bush are provided with PTFE red coatings.
6. A CO-based composition according to claim 12A transcritical reciprocating piston compressor as a refrigerant characterized by: a high-pressure cavity (41) and a low-pressure cavity (42) are further arranged in the cavity of the machine body (1), the high-pressure cavity (41) is located in the top inner cavity of the machine body (1) close to the bearing seat (12), the high-pressure cavity (41) is communicated with the interior of the cylinder cover (11), an exhaust valve (411) and a safety valve (412) communicated with the high-pressure cavity (41) are arranged on one side of the top of the machine body (1), and the diameter of the valve cavity is 16-22 mm; the low-pressure cavity (42) is positioned in an inner cavity of the top of the machine body (1) close to the motor cover (13), the low-pressure cavity (42) is communicated with the inner cavity of the machine body (1), an air suction valve (421) communicated with the low-pressure cavity (42) is arranged on the other side of the top of the machine body (1), and the diameter of the valve cavity is 25-32 mm.
7. A CO-based catalyst according to claim 62A transcritical reciprocating piston compressor as a refrigerant characterized by:the maximum working pressure of the high-pressure cavity (41) is 150bar, the wall thickness of the high-pressure cavity (41) is 25-30mm, the maximum working pressure of the low-pressure cavity (42) is 100bar, and the wall thickness of the low-pressure cavity (42) is 12-15 mm.
8. A CO-based composition according to claim 12A transcritical reciprocating piston compressor as a refrigerant characterized by: two air cylinders (14) are arranged on each side of the machine body (1) in a V-shaped arrangement, and the angle formed by the two air cylinders and the axis of the machine body (1) in the vertical direction is 40 degrees.
9. A CO-based composition according to claim 12A transcritical reciprocating piston compressor as a refrigerant characterized by: the machine body (1) is formed by casting ductile iron in an integrated mode, the wall thickness of the machine body (1) is 12-30mm, the working pressure of the machine body (1) is 40-145 bar, and a plurality of groups of rib plates (15) are arranged on two sides, close to the motor box (2), of the outer portion of the machine body (1) respectively.
10. A CO-based composition according to claim 12A transcritical reciprocating piston compressor as a refrigerant characterized by: the piston (16) is made of aluminum alloy and is treated by an anodic oxidation process, three piston rings are arranged on the peripheral surface of the piston (16), the diameter of the piston (16) is 35-55mm, and the stroke of the piston is 25-35 mm.
CN201911307120.5A 2019-12-18 2019-12-18 With CO2Transcritical reciprocating piston compressor as refrigerant Pending CN111022293A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911307120.5A CN111022293A (en) 2019-12-18 2019-12-18 With CO2Transcritical reciprocating piston compressor as refrigerant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911307120.5A CN111022293A (en) 2019-12-18 2019-12-18 With CO2Transcritical reciprocating piston compressor as refrigerant

Publications (1)

Publication Number Publication Date
CN111022293A true CN111022293A (en) 2020-04-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20220232A1 (en) * 2022-02-22 2023-08-23 Heaten As Improved compressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20220232A1 (en) * 2022-02-22 2023-08-23 Heaten As Improved compressor
WO2023163597A1 (en) 2022-02-22 2023-08-31 Heaten As Reciprocating compressor with non-self-actuated suction valve

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