CN100434696C - Reciprocating piston compressor for trans-critical CO2 refrigeration cycle - Google Patents
Reciprocating piston compressor for trans-critical CO2 refrigeration cycle Download PDFInfo
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- CN100434696C CN100434696C CNB2006101052598A CN200610105259A CN100434696C CN 100434696 C CN100434696 C CN 100434696C CN B2006101052598 A CNB2006101052598 A CN B2006101052598A CN 200610105259 A CN200610105259 A CN 200610105259A CN 100434696 C CN100434696 C CN 100434696C
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Abstract
The invention discloses a reciprocating piston compressor for CO2 transcritical refrigeration cycle, which is single-grade double-cylinder vertical self-closed structure. The motor shaft and the crankshaft are designed in the coaxial line with the alternating angle of 180 degrees. By connecting the side shell of motor with the side shell of crankshaft box, air leakage from oil seal generated by high pressure in opening compressor is avoided and the linkage at the flange connection position in dividing structure is decreased because the cylinder body is integrated with the crankshaft box and motor shell together. Intensity and rigidity of shell is increased and the lack of compressor intensity generated by high pressure in CO2 transcritical refrigeration cycle is solved. The compressor realizes enough circulation area for suction and exhaustion in the compact space by the design of charging and discharging valve plate of compressor and sucking and exhausting channels embedded in cylinder cover plate and the loss of flow resistance and airflow pulsation of suction and exhaustion are decreased. By the design of convex platform at the top of piston, clearance volume of compressor can be decreased effectively so as to improve the cubage efficiency of compressor.
Description
Technical field
The present invention relates to a kind of compressor, particularly a kind ofly be used to stride critical CO
2The reciprocating-piston compressor of refrigeration cycle, and provided suction, exhaust valve plate and the suction thereof of this reciprocating-piston compressor, the design of exhaust channel structure, to solve CO
2Compresser cylinder is inhaled, the narrow and small problem of installing space of exhaust place, makes this compression function have enough big suction, exhaust flow area and buffer cavity, thereby reduces the gas of compressor, and improve volumetric efficiency.
Background technique
Since late 1980s, because CFCs and HCFCs are to the destruction and the greenhouse effect of ozonosphere, with them is that the air conditioner industry of refrigeration agent is being faced with the challenge of developing substitute, in view of the new compound substitute can imply unpredictable harm equally, people are primarily focused on the nature refrigeration working medium, CO
2Because its good environmental protection characteristic and good flow, temperature conductivity become the most valued focus in the global range.
Than traditional CFCs and HCFCs, CO
2Low and critical-point pressure (7.37MPa) height of critical point temperature (31.1 ℃), when as refrigeration working medium, in most cases need to adopt and stride critical cycle.In striding critical cycle, compare CO with conventional working medium
2Compressor operating is under the situation of higher pressure, bigger refrigerating effect per unit swept volume, pressure reduction and littler compression ratio.Show according to the current prototype test data, suction pressure reaches 3.5～4.0MPa, outlet pressure is up to 8.0～11.0MPa, be 5～10 times of traditional working medium working pressure, suction and discharge pressure reduction can reach 5～8MPa, is moving under the operating mode under this high pressure and the big pressure reduction, design to compressor produces many requirements, under the operating mode of determining small flow, big refrigerating capacity, the distortion of the part that high pressure and big pressure reduction cause, little space is to compressor suction, exhaust passage and cylinder and compressor size designing requirement etc.Work as CO simultaneously
2Its refrigerating effect per unit swept volume is 22.6MJ/m far above conventional refrigeration agent at 0 ℃
3, be respectively NH
31.58 times, R12 and R22 8.25 times with 5.12 times, so CO
2The volume flow of refrigeration system significantly reduces, make that size, the valve of compressor are more much smaller than conventional refrigeration system with the circulation area of pipeline, under the flow that freezes equally, cylinder dimensions are also much smaller, the arrangement space of suction, outlet valve and suction thereof, exhaust passage is just very limited, causes CO
2A difficult point of compressor design.
CO
2After being suggested as environmental protection refrigerant, each big research institution has developed many CO that are applied to different occasions with chiller plant company in the world
2Refrigeration system, based on Europe and Japan, the wherein Japanese many small-sized household CO that develop based on the angle of saving the energy
2On the heat pump water heater, its CO
2Compressor is mainly based on small-sized.But CO
2Compressor is as the core component of refrigeration system, to the key effect that plays of the performance of CO2 refrigeration system, in the world at present to CO
2The research of compressor is still in continuing, and especially medium-and-large-sized also do not have a ripe type, and its core technology is never open.And China has some colleges and universities carrying out CO at present
2As the correlative study of refrigeration working medium, for CO
2The design of compressor does not also have actual development, is still a blank.
Summary of the invention
The object of the invention is to provide a kind of being applicable to stride critical CO
2The semiclosed reciprocating-piston compressor of refrigeration cycle is to solve the problems such as high pressure, High Pressure Difference and small flow that circulation requires.For this compressor provides a kind of novel suction, exhaust passage and suction, the design of exhaust valve plate, solve CO simultaneously
2Compresser cylinder is inhaled, the narrow and small problem of installing space of exhaust place, makes this compression function have enough big suction, exhaust flow area and buffer cavity, thereby reduces the gas of compressor, and improve volumetric efficiency.By sucking the design of gas through the motor side heating, avoid sucking the liquid hammer of refrigeration agent to cylinder and valve block, improved the reliability of suction, exhaust valve plate life-span and compressor.By the valve board structural design, effectively solve CO
2The main exploitation difficult point of compressor makes compressor arrangement compactness, processing and simple installation.
In order to realize above-mentioned task, the technical solution used in the present invention is:
A kind ofly stride critical CO
2Refrigeration cycle reciprocating-piston compressor, this compressor are the vertical semi-closed structure of single-stage twin-tub, comprising:
An incorporate housing, this housing is made of cylinder block, motor field frame and crankcase three parts;
Motor stator and motor rotor are installed in the motor field frame, and one 180 degree alternate angle crankshaft in this motor rotor and the crankcase is connected, and is used for two connecting rods of crankcase are driven; Connection simultaneously is fixed tightly in the oil pump assembly on the crankcase and drives;
Two connecting rods are connected by the sliding piston pin with two pistons, and two pistons and valve board assembly surround two cylinders, constitute the active chamber of compressor;
Two two cylinders that are integrated on the cylinder block, and the up and down extension vertical of the center of above-mentioned each cylinder on cylinder block with bent axle, two cylinders are symmetrical, and physical dimension is identical;
Two two pistons that are arranged in the cylinder, piston can move reciprocatingly in cylinder, is used to suck the CO of low-pressure
2Refrigeration agent, it is compressed and discharges high pressure CO
2Refrigeration agent;
It is characterized in that, above-mentioned valve board assembly is installed in the top of cylinder block, communicate with two cylinders and this compressor air-inlet cavity, exhaust cavity, to-and-fro motion along with above-mentioned piston, by being installed in the suction valve chip on the valve board assembly, suction, the vent ports on this valve board assembly of exhaust valve plate opening and closing, finish the suction to compressor, the requirement of exhaust control;
Two curve baths of opening on the motor field frame internal face, this curve bath surrounds first, second gas-entered passageway with the motor stator that is fixed tightly in the motor field frame, and above-mentioned first, second gas-entered passageway extends vertically, so that provide the fluid passage between the air-inlet cavity of the air aspiration cavity of above-mentioned compressor body and cylinder block;
In the middle of motor field frame and crankcase, open a through hole, motor field frame and crankcase are interconnected, the bottom of its position cylindrical space in motor field frame, and the interior level height of crankcase body is a little less than the bottom in hole, make gas pressure balancing in motor field frame and the crankcase, the lubricant oil in the motor field frame can pass back into crankcase;
Described valve board assembly contacts a side at air-breathing cover plate with cylinder, cylindrical side along air-breathing valve plate is processed a toroidal cavity, the 4th gas-entered passageway for the cylinder air aspiration cavity, above-mentioned groove has certain width, eight gas-entered passageways that are communicated with two cylinders, the 4th gas-entered passageway is communicated with the cylinder air aspiration cavity of two cylinders respectively by first suction port, second suction port, the 3rd suction port, the 4th suction port and the 5th suction port, the 6th suction port, the 7th suction port, the 8th suction port, and permission gas is when suction valve chip is opened and enter cylinder; And
Vent ports is concentric with cylinder, be positioned on the valve board assembly, and with above-mentioned valve board assembly on the air-breathing valve plate installed of sealing concentric, the annular channel between vent ports cylindrical and the air-breathing valve plate is the gas-entered passageway of cylinder, is sealed by suction valve chip.
The preferable technological scheme of the present invention is that also the plunger designs of can regulate cylinder clearance volume and tight space, high strength require sliding piston pin down design.At piston head design small boss, diameter can free in and out exhaust port less than exhaust port, and height designs according to cylinder clearance volume adjustment demand under less than the Aspirating valves plate thickness, the CO that invention is related to
2The compressor redundant gap volume is adjusted to the scope of requirement.
Piston directly directly is connected by the sliding piston pin with connecting rod, the sliding piston pin can axially slide in the pin-and-hole of piston, the two ends sphere pin cap of wrist pin designs for sphere, the employing flexible material is made, and on two spheres to gudgeon pin shaft to opening aperture, make piston shank inner space and external communications.
Beneficial effect of the present invention has been to use the valve board assembly design of compact structure, is satisfying CO
2In the time of compressor high strength and tight space, realized maximum suction, exhaust circulation area, satisfied the requirement of compressor suction, exhaust well, improved aspirated volume efficient, reduced because of the compressor noise and the vibration of inhaling, the exhaust cavity gas causes.The piston head boss that the present invention relates to simultaneously design has reduced the increase of the clearance volume that valve board assembly that this invention relates to causes effectively, has improved the volumetric coefficient and the compressor efficiency of compressor.The design of sliding piston pin has well solved the connectivity problem of tight space lower piston and connecting rod.The design of motor side gas-entered passageway has been avoided in the cylinder and the issuable liquid hit phenomenon in valve block place, has improved the reliability of compressor, satisfies the requirement of conventional refrigeration.
Description of drawings
Fig. 1 is the structural representation sectional drawing of compressor of the present invention, the overall structure of reflection compressor;
Fig. 2 is the left view of housing 2, reflects the structure of first, second gas-entered passageway 27,28;
Fig. 3 is the partial view of Fig. 1 in housing 2 and housing 1 joint, has reflected that compressor is communicated with the mechanism of air aspiration cavity 30 with the 3rd gas-entered passageway 31 of the air-inlet cavity 29 at housing 2 places at housing 1 place;
Fig. 4 is the structural drawing of valve board assembly 50 suction side I;
Fig. 5 is the structural drawing of valve board assembly 50 exhaust side II;
Fig. 6 is the sectional drawing of the A-A of Fig. 4;
Fig. 7 is the sectional drawing of the B-B of Fig. 5;
Fig. 8 is the structural drawing of sliding piston pin 5;
Label among the above-mentioned figure is represented respectively: 1. cylinder block, 2. motor field frame, 3. crankcase, 4A, 4B. piston, 5. sliding piston pin, 6A, 6B. connecting rod, 7. bent axle, 8. bearing shell, 9. first sliding bearing, 10. second sliding bearing, 11. oil pump covers, 12. motor rotors, 13. motor stator, 14. keys, 15. bolts, 16. the motor rotor pressing plate, 17. clutch shaft bearing pads, 18. second bearing shims, 19. the oil pump assembly, 20. cylinder head, 21. air-breathing end caps, 22. oil strainer, 23. electric heaters, 24. crankcase base plates, 25. lifting bolt, 26. through holes, 27. first gas-entered passageways, 28. second gas-entered passageway, 29. compressor air-inlet cavitys, 30. air aspiration cavitys, 31. the 3rd gas-entered passageway, 32. stiffening ribs, 33. air-breathing cover plates, 34. air-breathing valve plate, 35. the 4th gas-entered passageway, 36. suction valve chips, 37. cylinder air aspiration cavitys, 38A. first suction port, 38B. second suction port, 38C. the 3rd suction port, 38D. the 4th suction port, 39A. the 5th suction port, 39B. the 6th suction port, 39C. the 7th suction port, 39D. the 8th suction port, 40A, 40B. cylinder, 41. exhaust cavity, 42. exhaust valve plates, 43. exhaust reeds, 44. compressor air-discharging hole, 45. piston pin hole, 46. filter screens, 47. boss, 48. cylinder vent, 49. the compressor inlet hole, 50. valve board assemblies, 81. shanks, 82. through hole, 83. sphere pin caps.
Below in conjunction with accompanying drawing structure of the present invention and working principle are elaborated.
Embodiment
Referring to accompanying drawing, a kind of critical CO that strides involved in the present invention
2Compressor for refrigerating circulation, pattern are semiclosed reciprocating piston type.This compressor housing is by cylinder block 1, and motor field frame 2 and crankcase 3 three parts are formed.Cylinder block 1 constitutes two seal operation cylinder 40A, 40B with the top of piston 4A and piston 4B and valve board assembly 50 respectively, and two working cylinders are vertical and are parallel to each other that its design parameter is identical; Wrist pin 5 is linked to be link assembly with two piston 4A, 4B and connecting rod 6A, 6B, and crankshaft 7 is 180 arbors of writing music, and two connecting rods (6A and 6B) are connected with crankshaft 7, between install bearing shell 8 (8A and 8B) additional to satisfy the friction requirement.Crankshaft 7 is located to support by 9,10 liang on first, second sliding bearing, radially is constrained on motor field frame 2 and the oil pump cover 11, and oil pump cover 11 is by being bolted on the crankcase 3.Motor and two connecting rods 6 (6A and 6B) adopt coaxial driving, and with a crankshaft 7, employing key 14 drive fits are connected between rotor 12 and the crankshaft 7, and motor stator 13 is fixedly mounted on the motor field frame 2.In motor rotor 12 sides, motor rotor pressing plate 16 is pressed in it on motor rotor 12 by the bolt 15 that screws in crankshaft, guarantees the axially locating of motor rotor 12.Oil pump assembly 19 is fixedly connected on the oil pump cover 11, cylinder head 20 is fixedly connected on the cylinder block 1 with valve board assembly 50, air-breathing end cap 21 is fixedly connected on the housing 2 with lifting bolt 25, crankcase base plate 23 is fixedly connected on the housing 3, electric heater 23 embedded crankcase base plate 24 inside that are installed in, oil strainer 22 is installed on the housing 3, and oil pump assembly 19 passes through oil strainer 22 gear pump assemblies 19 from the oil inlet passage in the crankcase.Interconnect by hole 26 between motor field frame 2 and the crankcase 3, first, second gas-entered passageway (curved channel) 27,28 is made of the space between motor field frame 2 and the motor stator 13, be communicated with the air-inlet cavity 29 of compressor and the air aspiration cavity 30 of compressor, the air-inlet cavity 29,32 that the 3rd gas-entered passageway 31 is communicated with air aspiration cavity 30 and housing 2 places is the stiffening rib on the cylinder block 1.
In above-mentioned suction, outlet valve board component 50 structures, it mainly is made of with air-breathing valve plate 34 air-breathing cover plate 33.
Valve board assembly 50 air-breathing cover plate 33 with two cylinder (40A, 40B) contact one side, cylindrical side along air-breathing valve plate 34 is processed a toroidal cavity, the 4th gas-entered passageway 35 for cylinder air aspiration cavity 37, above-mentioned groove has certain width, be communicated with two cylinder 40A, eight gas-entered passageways of 40B, the 4th gas-entered passageway 35 is by the first suction port 38A, the second suction port 38B, the 3rd suction port 38C, the 4th suction port 38D and the 5th suction port 39A, the 6th suction port 39B, the 7th suction port 39C, the 8th suction port 39D respectively with two cylinder 40A, the cylinder air aspiration cavity 37 of 40B is communicated with, and allows gas when suction valve chip 36 is opened and enter cylinder 40A, 40B;
With the left side structure is example, suction side at valve board assembly 50, the cylinder air aspiration cavity 37 of suction valve chip 36 tops is communicated with air aspiration cavity 30 by the 4th gas-entered passageway 35 on the valve plate, the 4th gas-entered passageway 35 is given 37 air inlets of cylinder air aspiration cavity from first, second, third, fourth suction port (38A, 38B, 38C, 38D), and air-breathing valve plate 34 is sealed and matched on air-breathing cover plate 33.Suction valve chip 36 is contained between air-breathing valve plate 34 and the piston 4 by the pin locating clip, the switching of the gas-entered passageway between control cylinder air aspiration cavity 37 and the cylinder 40A.Air-breathing cover plate 33 upper cylinder exhaust ports 48 are concentric with cylinder 40A, be communicated with cylinder 40A and exhaust cavity 41, exhaust valve plate 42 is installed in cylinder vent 48 tops, the switching of air intake passage between control cylinder 40A and the exhaust cavity 41, the exhaust reed 43 of exhaust valve plate 42 and its top is fixedly installed to the upper bottom surface side of cylinder cover plate.The structure of the bottom surface piston 4B side of valve board assembly 50 is identical along the center symmetry between cylinder 40A and the cylinder 40B with the structure of piston 4A side.Compressor air-discharging hole 44 is communicated with exhaust cavity 41 and compressor external system pipeline.
Of the present inventionly stride critical CO
2The refrigeration cycle reciprocating-piston compressor is the design of single-stage two-cylinder type, uses the crankshaft of 180 degree alternate angles to carry out power transmission, makes crankcase pressure identical with motor side pressure, has avoided CO
2The leakage at the bent axle axle envelope place that brings of high pressure, the lubricant oil that the low-temperature refrigerant that enters air-inlet cavity from inlet hole is taken back can be flowed back to crankcase simultaneously.Cylinder is directly designed on compressor housing, avoided the cylinder in the design of conventional reciprocating compressor and the leakage of housing joint.Incorporate case design has been simplified the compressor housing structure amount, has improved the sealing of high pressure situation lower compression machine.
Working principle of the present invention is: the low temperature CO that returns from system
2Refrigeration agent enters in the motor field frame 2 from the compressor inlet hole 49 on the air-breathing end cap 21 of compressor, and through filter screen 46 filtrations, form the air-breathing cavity of low temperature at air-inlet cavity 29 places, first, second gas-entered passageway 27,28 of low-temperature refrigerant by two curve baths left on housing 2 enters air aspiration cavity 30 along the motor stator wall, the motor back of dispelling the heat is formed superheated refrigerant, make CO
2Low-temperature refrigerant is gasified totally, and has avoided the liquid constituent that may exist in may the cryogenic refrigeration liquid hammer to cylinder and valve block, has increased the reliability of compressor.After this enter the air aspiration cavity 30 of compressor by the 3rd gas-entered passageway 31 between cylinder block 1 and the motor field frame 2, in air aspiration cavity 30, form enough big air-breathing buffer cavity.
Being example with the structure at left hand piston 4A place is described the working procedure of compressor.Low-pressure gas in air aspiration cavity 30 enters cylinder air aspiration cavity 37 by the 4th gas-entered passageway 35 on the valve board assembly 50 by 38A, 38B, 38C and four suction ports of 38D, waits for opening of suction valve chip 36, prepares to enter cylinder.After piston 4A begins to move downward from top dead center, the compressor inflation process begins, pressure in the cylinder 40A reduces rapidly, behind the pressure of pressure greater than cylinder 40A of cylinder air aspiration cavity 37, suction valve chip 36 is opened, and inflation process finishes, and breathing process begins, low-pressure gas begins to enter cylinder 40A, when piston 4A moves to lower dead center, finish maximal inspiratory capacity, piston 4A begins to swivel motion, gas is compressed in the cylinder 40A, pressure raises, and after the pressure in the cylinder 40A was greater than cylinder air aspiration cavity 37 pressure, suction valve chip 36 was closed, breathing process finishes, and compression process begins.4A moves upward along with piston, cylinder 40A pressure increases gradually, after pressure was greater than the pressure in the exhaust cavity 41, exhaust valve plate 42 was opened, and compression process finishes, exhaust process begins, along with after piston 4A arrives top dead center and move downward once more, the pressure in the cylinder 40A is lower than the pressure in the exhaust cavity 41, and exhaust valve plate is closed, exhaust process finishes, and enters next circulation.Crankshaft 7 is 180 degree alternate angle designs, and under the driving of crankshaft 7, piston 4A and piston 4B carry out the to-and-fro motion of 180 degree phase differences.
Valve board assembly 50 with the suction of compactness, arrange its space and carried out sufficient utilization, farthest use cylinder cross section flow area, adopt ring to put into gas, the suction-exhaust mode of intermediate exhaust.Structure at left hand cylinder 40A place, adopt the 4th gas-entered passageway 35 of ring-type, by suction port 38A, 38B, 38C and 38D the cylinder air aspiration cavity on the suction valve chip 36 37 is carried out air feed, flow area is increased, the compressor efficiency that reduces to cause because of the air inlet deficiency loses, and effectively reduces the compressor noise and the vibration at this place simultaneously.Cylinder air aspiration cavity 37 is to design for the inner passage that processes on the air-breathing cover plate 33, after the 4th gas-entered passageway 35, cylinder air aspiration cavity 37 and first to fourth suction port 38A, 38B, 38C and 38D machine, be sealed and matched on air-breathing cover plate 33, it is easy to process, and sealing is good.Cylinder 40B is in the middle point symmetry of the structure division at structure division on the valve board assembly and cylinder 40A place with two cylinder axises.Be used in combination Reed Valve in the structural design of valve board assembly 50 as suction, outlet valve, better finished the CO that the present invention relates to
2Compressor has solved CO in the sealing at valve plate and cylinder place
2The high pressure that causes as refrigeration agent and the difficult problem of little installing space have improved the air-breathing index of compressor, have optimized compressor efficiency.
Because cylinder vent 48 is positioned at the top of valve board assembly 50, because the height of valve board assembly 50 and the area of cylinder vent 48 produce certain clearance volume, top design cylindrical boss 47 at piston 4A, the diameter of boss 47 is less than the diameter of cylinder vent 48, clearance volume can be reduced by choose reasonable, improve the volumetric coefficient of compressor height.
Because piston size is very little, requirement of strength is very high again, be difficult to use the structure of the fixed piston pin in the conventional piston rod device at internal piston, so sliding piston pin 5 has been used in design among the piston 4A, it can move axially in the circular wall of cylinder 40A, radially retrained, satisfy the driving requirement of connecting rod 6A piston 4A by pin-and-hole.Contact wear for the circular wall that reduces 5 couples of cylinder 40A of sliding piston pin produces is designed to spheric structure with its both ends of the surface, and uses flexible material, makes it have good usability, has solved the CO that invention relates to
2This difficult problem of compressor.
Of the present inventionly stride critical CO
2At the alternative existing conventional coolant compressor of most occasions, and at many conventional refrigeration agent CFCs with when HCFCs can not well use or performance can not meet the demands, it all has good performance performance to refrigeration cycle with reciprocating-piston compressor.
Of the present inventionly stride critical CO2Kind of refrigeration cycle has with the main application fields of reciprocating-piston compressor: In compression condensation formula refrigerating method, with the alternative existing compressor of the characteristic of its natural refrigerant, reach Outstanding environmental requirement, its COP index is suitable with conventional working medium such as R134a under cooling condition, system Be better than R134a under the thermal condition; In high temperature heat pump system, stride critical CO2Compressor is because CO2Do Self good thermophysical property during for cold-producing medium can produce the high temperature more than 90 ℃, and some occasion High-temperature can reach more than 130 ℃, mate suitable refrigeration system can be applicable to residential quarter and commercial heat supply, Commercial drying unit and heating crude oil field; Heat mode with routine and compare, add such as electrical heating, solar energy The combustion systems such as heat, coal, natural gas are compared CO2Compressor with the low level transformation of energy in the environment is High potential utilizes amount of heat in a large number, has excellent Energy Efficiency Ratio, can be widely used in existing family Heat, the field such as outdoor bathing place hot water manufacturing; Stride critical CO2Compressor is good at the heating performance of low evaporating temperature, at cold district, adopts the refrigeration system of conventional coolant compressor can not finish the requirement that heats, and of the present inventionly strides critical CO2Kind of refrigeration cycle can be finished this demand with reciprocating-piston compressor.
Claims (3)
1. stride critical CO for one kind
2Refrigeration cycle reciprocating-piston compressor, this compressor are the vertical semi-closed structure of single-stage twin-tub, comprising:
An incorporate housing, this housing is made of cylinder block (1), motor field frame (2) and crankcase (3) three parts;
Motor stator (13) and motor rotor (12) are installed in the motor field frame (2), one 180 degree alternate angle crankshaft (7) in this motor rotor (12) and the crankcase (3) is connected, and is used for two connecting rods (6A, 6B) of crankcase (3) are driven; Connection simultaneously is fixed tightly in the oil pump assembly (19) on the crankcase (3) and drives;
Two connecting rods (6A, 6B) are connected by sliding piston pin (5) with two pistons (4A, 4B), and two pistons (6A, 6B) surround two cylinders (40A, 40B) with valve board assembly (50), constitute the active chamber of compressor;
Two two cylinders (40A, 40B) that are integrated on the cylinder block (1), and the up and down extension vertical of the center of above-mentioned each cylinder on cylinder block (1) with bent axle, two cylinders (40A, 40B) are symmetrical, and physical dimension is identical;
Two two pistons (4A, 4B) that are arranged in the cylinder (40A, 40B), piston (4A, 4B) can move reciprocatingly in cylinder (40A, 40B), is used to suck the CO of low-pressure
2Refrigeration agent, it is compressed and discharges high pressure CO
2Refrigeration agent;
It is characterized in that, above-mentioned valve board assembly (50) is installed in the top of cylinder block (1), communicate with two cylinders (40A, 40B) and this compressor air-inlet cavity (30), exhaust cavity (41), to-and-fro motion along with above-mentioned piston, by being installed in the suction valve chip (34) on the valve board assembly (50), suction, the vent ports on exhaust valve plate (42) these valve board assemblies of opening and closing (50), finish the suction to compressor, the requirement of exhaust control;
Two curve baths of opening on motor field frame (2) internal face, this curve bath surrounds first, second gas-entered passageway (27 with the motor stator (13) that is fixed tightly in the motor field frame (2), 28), and above-mentioned first, second gas-entered passageway (27,28) extend vertically, so that between the air-inlet cavity (29) of the air aspiration cavity (30) of above-mentioned compressor body and cylinder block (1), provide the fluid passage;
At the middle through hole (26) of opening of motor field frame (2) and crankcase (3), motor field frame (2) and crankcase (3) are interconnected, the bottom of its position cylindrical space in motor field frame (2), and the interior level height of crankcase body (3) is a little less than the bottom of hole (26), make gas pressure balancing in motor field frame (2) and the crankcase (3), the lubricant oil in the motor field frame (2) can pass back into crankcase (3);
Described valve board assembly (50) is at air-breathing cover plate (33) and cylinder (40A, 40B) contact one side, cylindrical side along air-breathing valve plate (34) is processed a toroidal cavity, the 4th gas-entered passageway (35) for cylinder air aspiration cavity (37), above-mentioned groove has certain width, be communicated with two cylinder (40A, eight gas-entered passageways 40B), the 4th gas-entered passageway (35) is by first suction port (38A), second suction port (38B), the 3rd suction port (38C), the 4th suction port (38D) and the 5th suction port (39A), the 6th suction port (39B), the 7th suction port (39C), the 8th suction port (39D) respectively with two cylinder (40A, 40B) cylinder air aspiration cavity (37) is communicated with, and allows gas at suction valve chip (36) when opening and enter cylinder (40A, 40B); And
Cylinder vent (48) is concentric with cylinder (40A, 40B), be positioned on the valve board assembly (50), and it is concentric with the air-breathing valve plate (34) of the last sealing installation of above-mentioned valve board assembly (50), annular channel between cylinder vent (48) cylindrical and the air-breathing valve plate (34) is the gas-entered passageway of cylinder (40A, 40B), is sealed by suction valve chip (36).
2. as claimed in claim 1ly stride critical CO
2The refrigeration cycle reciprocating-piston compressor, it is characterized in that, one cylindrical boss (47) is arranged at the top of described piston (4A, 4B), its cylindrical center is concentric with piston, the diameter of cylindrical boss (47) is less than the aperture of cylinder vent (48), height is controlled according to the clearance volume designing requirement, in piston (4A, the 4B) process that moves back and forth, can pass in and out cylinder vent (48) smoothly.
3. as claimed in claim 1ly stride critical CO
2The refrigeration cycle reciprocating-piston compressor, it is characterized in that, described piston (4A, 4B) directly is connected by sliding piston pin (5) with connecting rod (6A, 6B), (4A, 4B) is radially restrained for piston, can freely rotate along its center line, axially has level of freedom, be constrained to the cylinder shape inner wall face of cylinder (40A, 40B) in axial sliding, the sphere design is adopted at wrist pin (5) two ends, and use flexible material to make the back and use interference fit to be inserted in the wrist pin cylinder, wrist pin (5) two ends sphere respectively bores an aperture, communicates with wrist pin (5) endoporus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101052598A CN100434696C (en) | 2006-12-22 | 2006-12-22 | Reciprocating piston compressor for trans-critical CO2 refrigeration cycle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101052598A CN100434696C (en) | 2006-12-22 | 2006-12-22 | Reciprocating piston compressor for trans-critical CO2 refrigeration cycle |
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| CN1995751A CN1995751A (en) | 2007-07-11 |
| CN100434696C true CN100434696C (en) | 2008-11-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102374166A (en) * | 2010-08-23 | 2012-03-14 | 珠海格力节能环保制冷技术研究中心有限公司 | Pump body with countersink grooves and bi-rotor two-stage enthalpy-increasing compressor having same |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101718267B (en) * | 2009-04-30 | 2011-09-14 | 上海加冷松芝汽车空调股份有限公司 | Compressor including oil-gas separation structure |
| CN107061225A (en) * | 2017-03-20 | 2017-08-18 | 上海瀚氢动力科技有限公司 | Suitable for the gas pressurized device of flammable explosive gas |
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| CN109611314A (en) * | 2018-12-29 | 2019-04-12 | 南京久鼎制冷空调设备有限公司 | The high subcritical CO of pressure-bearing2Refrigeration compressor |
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| US5080130A (en) * | 1990-06-01 | 1992-01-14 | Bristol Compressors, Inc. | Gas compressor head and discharge valve construction |
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| CN102374166A (en) * | 2010-08-23 | 2012-03-14 | 珠海格力节能环保制冷技术研究中心有限公司 | Pump body with countersink grooves and bi-rotor two-stage enthalpy-increasing compressor having same |
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|---|---|
| CN1995751A (en) | 2007-07-11 |
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