EP1041285A2 - Reciprocating type compressor comprising a suction chamber and partition walls in a cylinder head - Google Patents
Reciprocating type compressor comprising a suction chamber and partition walls in a cylinder head Download PDFInfo
- Publication number
- EP1041285A2 EP1041285A2 EP00302566A EP00302566A EP1041285A2 EP 1041285 A2 EP1041285 A2 EP 1041285A2 EP 00302566 A EP00302566 A EP 00302566A EP 00302566 A EP00302566 A EP 00302566A EP 1041285 A2 EP1041285 A2 EP 1041285A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- type compressor
- cylinder head
- reciprocating type
- partition walls
- cylinder
- 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.)
- Granted
Links
Images
Classifications
-
- 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
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B27/1036—Component parts, details, e.g. sealings, lubrication
- F04B27/1081—Casings, housings
-
- 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
- F04B39/0027—Pulsation and noise damping means
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
-
- 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
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
Definitions
- the present invention relates to the improvement of the refrigerant gas suction passage of a reciprocating type compressor.
- a reciprocating type compressor is arranged such that a cylinder head has a series of partition walls for separating the internal space thereof to a suction chamber and a discharge chamber.
- the suction chamber is arranged as a common suction space without any partition and the refrigerant gas introduced from the introduction hole of the cylinder head is sequentially sucked from the suction ports of a valve plate coupled with a cylinder block according to the suction stroke of pistons (hereinafter, referred to as conventional art 1).
- the refrigerant gases are sucked from the refrigerant introduction holes of the cylinder head to respective bores and the lengths of passages of the refrigerant gases are different depending upon respective bores. Further, since the refrigerant gases are sucked in the common suction space, pulsation is caused in the pressure of the sucked gas by the dynamic interference among the gases sucked into the respective bores. The pressure pulsation is transmitted to an evaporator in the inside of a car through piping. Thus, unpleasant noise due to resonance becomes a problem.
- Japanese Unexamined Patent Publication No. 7-35039 discloses a technology for preventing the occurrence of noise.
- the reciprocating type compressor disclosed in the conventional art 2 includes a cylinder block having a plurality of bores formed in parallel with a central axis, a drive shaft having an end fitted in and supported by the shaft hole of the cylinder block and the other end supported by a front housing, pistons coupled with a swash plate, which is moved together with the drive shaft, and moving linearly in the bores, a housing jointed to the outside end of the cylinder block through a valve plate and a suction unit formed on the housing and communicating with the bores through suction ports formed passing through the valve plate.
- the suction unit is composed of a refrigerant introduction hole and pipe-shaped branch passages radially branched from the refrigerant introduction hole in six directions and independently communicating with the respective suction ports, respectively.
- the cross sections of a series of all the refrigerant passages including the suction unit and the suctions ports are formed to have the same shape and the same size.
- each of the branch passages communicating with the respective cylinders is formed in the pipe-shape having a relatively small diameter and has a long distance.
- pressure losses in the branch passages are increased following the decrease in refrigerating capability.
- one ends of respective branch ports are formed to join at the positions just below the refrigerant introduction port, the amount of refrigerant sucked into the cylinders is liable to be affected by the change of the flow rate of the refrigerant.
- the reciprocating type compressor is also disadvantageous in that the components of a drive mechanism are undesirably vibrated to result in generation of unpleasant noise.
- a reciprocating type compressor which comprises a cylinder block with a plurality of cylinder bores formed therein; a plurality of pistons received in the cylinder bores, respectively; a cylinder head connected to the cylinder block and having a refrigerant introduction hole; a suction chamber provided in the cylinder head and connecting the refrigerant introduction hole to the cylinder bores and which compresses a fluid introduced into the cylinder bores by the reciprocating motion of the pistons in the cylinder bores.
- the cylinder head comprises partition walls dividing the suction chamber into fluid paths for introducing the fluid into respective cylinder bores.
- the reciprocating type compressor 11 shown in the conventional art 2 includes a cylinder block 15 formed into one body with a main housing 12 and having a plurality of bores 13 disposed in parallel with a central axis, a drive shaft 21 having one end fitted into and supported by a shaft hole 17 of the cylinder block 15 and the other end supported by a front housing 19, pistons 25 coupled with a swash plate 23, which is moved together with the drive shaft 21, and moving linearly in the bores 13, a housing 29 jointed to the outside end of the cylinder block 15 through a valve plate 27, and a suction unit 33 communicating with the bores 13 through suction ports 31 formed to pass through the valve plate 27 formed on the housing 29.
- the reciprocating type compressor according to the conventional art 2 employs the rotary swash plate 23 and converts a rotating motion thereof into the reciprocating motions of the pistons 25 through shoes 41.
- the suction unit 33 is composed of a refrigerant introduction port 35 and pipe-shaped branch passages 37 which are radially branched from the refrigerant introduction port 35 in six directions and independently communicate with respective suction ports 31.
- the suction unit 33 and a series of the refrigerant passages 37 including the suction ports 31 have the same shape and the same size.
- numeral 39 denotes a refrigerant discharge port.
- a reciprocating type compressor 43 of a first embodiment of the present invention includes a cylinder block 49 formed integrally with a casing or housing 47 including a plurality cylinder bores 45, and a front housing 51 disposed at an end of the housing 47. Further, the reciprocating type compressor 43 includes a rotatable shaft 55 which is inserted up to the insertion hole 53 of the cylinder block 49 in the casing 47 through the front housing 51. The rotatable shaft 55 is rotatably supported by the front housing 51 and the cylinder block 49 through bearings 57 and 59, respectively. A rotor 61 is disposed to the rotatable shaft 55 at a position near to the front housing 51 and fixed to the rotation shaft 55 by a bolt 63.
- An end of the rotor 61 is supported by the inner wall of the front housing 51 through a thrust bearing 65 and the other thereof is coupled with an end of a slant plate 67 disposed around the rotatable shaft 55 through a hinged joint mechanism 69.
- a wobble plate 71 is disposed around the cylindrical portion of the slant plate 67 at the central portion thereof so as to swing in accordance with a rotation of the slant plate 67 through a thrust bearing 73.
- a groove is formed at a portion 75a of the periphery of the wobble plate 71 and engaged with a rail plate 75b disposed in the casing 47 so that it can be moved along an axial direction with preventing from rotating.
- the wobble plate 71 and the rail plate 75b constitute a rotation preventing mechanism 77.
- the rotation preventing mechanism 77 is arranged such that it can move the wobble plate 71 in the direction along the rotatable shaft 55 but it prevents the wobble plate 71 from rotating around the rotatable shaft 55.
- Pistons 81 are disposed in the cylinder bores 45 of the cylinder block 49 and connected to the peripheral portion of the wobble plate 71 on the other end thereof through piston rods 83.
- a cylinder head 87 is disposed to the other end of the cylinder block 49 of the casing 47 through a valve plate device 85.
- the valve plate device 85 includes a valve plate main body 85a, which has a not shown suction valve and a discharge valve 89, and a retainer 91.
- the suction valve and the discharge valve are formed on both of surfaces of the valve plate and stacked under seal members (not shown), respectively.
- the retainer 91 is disposed so as to cover the discharge valve 89.
- the cylinder head 87 includes a first cylinder head unit 95 disposed to the outside of the compressor and a second cylinder head unit 97 interposed between the first cylinder head unit 95 and the valve plate device 85.
- the first cylinder head unit 95 includes a bottom wall 101 and a cylindrical side wall 103 standing vertically from the periphery of the bottom wall 101.
- a refrigerant introduction hole 105 is formed at the center of the bottom wall 101.
- partition walls 107 substantially extend radially inwardly from the positions of the cylindrical side wall 103 in a peripheral direction at approximately similar intervals and the extended end portions of the partition walls 107 are located radially outwardly of the refrigerant introduction hole 105.
- voids 109 which will be hereinafter referred to as first suction chambers 109, are partitioned by adjacent partition walls 107 and portions of the side wall 103 in correspondence to the cylinder bores 45.
- a void 111 is formed by being surrounded by the extended end portions of the partition walls 107. Note that, as can be seen from Fig.
- the inner ends in the radial direction of the first suction chambers 109 are open to the void 111, respectively.
- the extended end portion of one of the partition walls 107 has an elliptic cross section and a blind screw hole 115 is drilled thereto in an axial direction.
- the extended end portion of another one of the partition walls 107 also has a circular cross section and a through-hole 113 for a discharge port 127 is drilled therethrough in the axial direction.
- boss portions 117 are formed at the portions of the side wall 103 corresponding to the base portions of the respective the partition walls 107 and screw inserting holes 119 are drilled to the boss portions 117 in the axial direction. Note that the side wall 103, the partition walls 107 and the boss portions 117 are designed to have the same height, respectively.
- the second cylinder head unit 97 includes a bottom wall 121 and a cylindrical thick side wall 117 standing vertically from the peripheral edge of the bottom wall 121.
- the side wall 117 has a plurality of through-holes 123 drilled thereto in correspondence to the voids 109 of the first cylinder head unit 95.
- the lateral cross section of each through-hole 123 is formed in an elliptic shape having a large area.
- the through-holes 123 are referred to as second suction chambers 123.
- the first suction chambers 109 of the first cylinder head unit 95 communicate with the second suction chambers 123 of the second cylinder head unit 97 which correspond thereto.
- the bottom wall 121 has through-holes 125 drilled thereto at the positions thereof corresponding to the above through-holes 113 and a discharge hole 127 is formed by the through-holes 113 and 125.
- the inside surface 129 of the side wall 117 is waved radially.
- a discharge chamber 131 is partitioned by the side wall 117, the bottom wall 121 and the valve plate device 85.
- a plurality of screw inserting holes 133 are drilled to the side wall 117 in correspondence to the screw inserting holes 119 of the first cylinder head unit 95.
- shaft portions of bolts 135 pass through a plurality of screw inserting holes 133 and the screw inserting holes 85b drilled to the valve plate device 85 in correspondence to the screw inserting holes 119 and are screwed into screw holes 49a drilled to the cylinder block 49, whereby the first and second cylinder head units 95 and 97, the valve plate device 85 and the cylinder block 49 are fixed to each other.
- the side wall 117 is formed integrally with the bottom wall 121 in the present invention, the side wall 117 may be formed separately from the bottom wall 121 and thereafter the two members may be fixed to each other.
- refrigerant gases flow from an external refrigerant circuit into the void 111 through refrigerant introduction hole 105 and further flows into first suction chambers 109.
- the refrigerant gases having flowed into the first suction chambers 109 further flow into the second suction chambers 123 and then sucked into the cylinder bores 45 through suction ports 139.
- the refrigerant gases having been compressed by the pistons 81 are discharged into a discharge chamber 131 from the cylinder bores 45 through a discharge port 141 and flow to the external refrigerant circuit through the discharge port 127.
- the refrigerant passage from the refrigerant introduction hole 105 to the cylinder bores 45 is formed of the void 111, the first suction chambers 109 and the second suction chambers 123. Therefore, the refrigerant gases having flowed from the external refrigerant circuit into the void 111 through the refrigerant introduction hole 105 flow into the first suction chambers 109 which correspond to the respective cylinder bores 45 and further are substantially isolated from each other.
- the refrigerant gases are sucked into the respective cylinder bores 45, the mutual dynamic interference of the refrigerant gases is reduced and thus the pulsation of the suction pressure of the refrigerant gases can be suppressed. As a result, it is possible to lower the noise level in the inside of a car.
- a large pressure loss is not caused in the refrigerant passage from refrigerant introduction hole 105 to the cylinder bores 45 because any of the void 111, first suction chambers 109 and second suction chambers 123 has a large volume.
- the refrigerant gases having flown from the external refrigerant circuit into the void through the refrigerant introduction hole 105 is received once by the first suction chambers 109 which are isolated from each other, it is difficult for the amount of the refrigerant sucked by the cylinders to be affected by the change of the flow rate of the refrigerant supplied to the compressor, whereby the unpleasant noise generated from the parts such as a wobble plate 71 which constitute a driving mechanism can be prevented.
- Fig. 7 is a graph showing that the pulsation of suction pressure is suppressed by the present invention described above.
- the ordinate shows the magnitude of suction gas pulsation (unit: dBEU, wherein EU is the abbreviation of engineering unit) and the abscissa shows the flow rate (unit: kg/hour) of liquid refrigerant in the liquid line of a refrigerating circuit (portion from a condensation vessel to an expanding function element).
- the cylinder head of a reciprocating type compressor according to a second embodiment of the present invention is arranged similarly to the cylinder head shown in Fig. 3 to Fig. 6 except the structure of a void 111 is different.
- the void 111 is formed in a taper shape so that the diameter of the inner wall or partition wall 107 thereof is gradually increased inwardly as well as a plurality of projecting folds 107a are formed on the inner wall surface thereof.
- Each of the projecting folds 107a has a size and shape of such a degree as not to cause a pressure loss.
- a first cylinder head unit 95 is arranged such that a plurality of straightening plates 107b, each of which is composed of a plate member projecting in a direction perpendicular to the direction in which each partition wall 107 extends, are disposed to the partition walls 107 on both the sides in the lengthwise direction thereof.
- Each straightening plate 107b has a size and shape of such a degree as not to cause a pressure loss.
- pressure pulsation is more attenuated than that of the reciprocating type compressor of the first embodiment by the straightening plates 107b provided with the partition walls 107.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
Description
- The present invention relates to the improvement of the refrigerant gas suction passage of a reciprocating type compressor.
- Conventionally, a reciprocating type compressor is arranged such that a cylinder head has a series of partition walls for separating the internal space thereof to a suction chamber and a discharge chamber. The suction chamber is arranged as a common suction space without any partition and the refrigerant gas introduced from the introduction hole of the cylinder head is sequentially sucked from the suction ports of a valve plate coupled with a cylinder block according to the suction stroke of pistons (hereinafter, referred to as conventional art 1).
- In the conventional art 1, the refrigerant gases are sucked from the refrigerant introduction holes of the cylinder head to respective bores and the lengths of passages of the refrigerant gases are different depending upon respective bores. Further, since the refrigerant gases are sucked in the common suction space, pulsation is caused in the pressure of the sucked gas by the dynamic interference among the gases sucked into the respective bores. The pressure pulsation is transmitted to an evaporator in the inside of a car through piping. Thus, unpleasant noise due to resonance becomes a problem.
- Japanese Unexamined Patent Publication No. 7-35039 (hereinafter, referred to as conventional art 2) discloses a technology for preventing the occurrence of noise.
- The reciprocating type compressor disclosed in the conventional art 2 includes a cylinder block having a plurality of bores formed in parallel with a central axis, a drive shaft having an end fitted in and supported by the shaft hole of the cylinder block and the other end supported by a front housing, pistons coupled with a swash plate, which is moved together with the drive shaft, and moving linearly in the bores, a housing jointed to the outside end of the cylinder block through a valve plate and a suction unit formed on the housing and communicating with the bores through suction ports formed passing through the valve plate. The suction unit is composed of a refrigerant introduction hole and pipe-shaped branch passages radially branched from the refrigerant introduction hole in six directions and independently communicating with the respective suction ports, respectively. The cross sections of a series of all the refrigerant passages including the suction unit and the suctions ports are formed to have the same shape and the same size.
- In the conventional art 2, however, each of the branch passages communicating with the respective cylinders is formed in the pipe-shape having a relatively small diameter and has a long distance. Thus, a problem arises in that pressure losses in the branch passages are increased following the decrease in refrigerating capability. Further, since one ends of respective branch ports are formed to join at the positions just below the refrigerant introduction port, the amount of refrigerant sucked into the cylinders is liable to be affected by the change of the flow rate of the refrigerant. As a result, the reciprocating type compressor is also disadvantageous in that the components of a drive mechanism are undesirably vibrated to result in generation of unpleasant noise.
- It is an object of the present invention to provide a reciprocating type compressor including a cylinder head capable of suppressing the pulsation of suction pressure and preventing the reduction of a refrigerating capability thereby at a less expensive cost.
- It is another object of the present invention to provide a reciprocating type compressor including a cylinder head which makes it difficult for the amount of refrigerant sucked into cylinders to be affected by the change of the flow rate of refrigerant and which can prevent the unpleasant noise generated from the components constituting a drive mechanism thereby at a less expensive cost.
- According to the present invention, there is provided a reciprocating type compressor which comprises a cylinder block with a plurality of cylinder bores formed therein; a plurality of pistons received in the cylinder bores, respectively; a cylinder head connected to the cylinder block and having a refrigerant introduction hole; a suction chamber provided in the cylinder head and connecting the refrigerant introduction hole to the cylinder bores and which compresses a fluid introduced into the cylinder bores by the reciprocating motion of the pistons in the cylinder bores. In the present invention, the cylinder head comprises partition walls dividing the suction chamber into fluid paths for introducing the fluid into respective cylinder bores.
- In the Drawings;
- Fig. 1 is a sectional view showing a reciprocating type compressor according to the conventional art 2;
- Fig. 2 is a sectional view taken along the line II - II of the reciprocating type compressor of Fig. 1;
- Fig. 3 is a sectional view showing a reciprocating type compressor according to a first embodiment of the present invention;
- Fig. 4 is a partial sectional view showing the cylinder block of the reciprocating type compressor of Fig. 3;
- Fig. 5 is a view of a first cylinder head unit of Fig. 4 looked from the section taken along the line V - V of Fig. 4;
- Fig. 6 is a view of a second cylinder head unit of Fig. 4 looked from the section taken along the line VI - VI of Fig. 4;
- Fig. 7 is a graph showing a pressure pulsation suppressing effect of the reciprocating type compressor according to the first embodiment of the present invention;
- Fig. 8A is a sectional view showing a portion of the cylinder head of a reciprocating type compressor according to a second embodiment of the present invention;
- Fig. 8B is a view of the cylinder head of Fig. 8A looked from below it; and
- Fig. 9 is a view showing a portion of the cylinder head of a reciprocating type compressor according to a third embodiment of the present invention.
-
- Before the description of embodiments of the present invention, a reciprocating type compressor according to a conventional art will be described for the easy understanding of the present invention.
- Referring to Fig. 1, the reciprocating
type compressor 11 shown in the conventional art 2 includes acylinder block 15 formed into one body with amain housing 12 and having a plurality ofbores 13 disposed in parallel with a central axis, adrive shaft 21 having one end fitted into and supported by ashaft hole 17 of thecylinder block 15 and the other end supported by afront housing 19,pistons 25 coupled with aswash plate 23, which is moved together with thedrive shaft 21, and moving linearly in thebores 13, ahousing 29 jointed to the outside end of thecylinder block 15 through avalve plate 27, and asuction unit 33 communicating with thebores 13 throughsuction ports 31 formed to pass through thevalve plate 27 formed on thehousing 29. - The reciprocating type compressor according to the conventional art 2 employs the
rotary swash plate 23 and converts a rotating motion thereof into the reciprocating motions of thepistons 25 throughshoes 41. - Referring to Fig. 2 in addition to Fig. 1, the
suction unit 33 is composed of arefrigerant introduction port 35 and pipe-shaped branch passages 37 which are radially branched from therefrigerant introduction port 35 in six directions and independently communicate withrespective suction ports 31. Thesuction unit 33 and a series of therefrigerant passages 37 including thesuction ports 31 have the same shape and the same size. Note thatnumeral 39 denotes a refrigerant discharge port. - Then, embodiments of the present invention will be described with reference to the drawings.
- Referring to Fig. 3, a reciprocating
type compressor 43 of a first embodiment of the present invention includes acylinder block 49 formed integrally with a casing orhousing 47 including aplurality cylinder bores 45, and afront housing 51 disposed at an end of thehousing 47. Further, the reciprocatingtype compressor 43 includes arotatable shaft 55 which is inserted up to theinsertion hole 53 of thecylinder block 49 in thecasing 47 through thefront housing 51. Therotatable shaft 55 is rotatably supported by thefront housing 51 and thecylinder block 49 throughbearings rotor 61 is disposed to therotatable shaft 55 at a position near to thefront housing 51 and fixed to therotation shaft 55 by abolt 63. An end of therotor 61 is supported by the inner wall of thefront housing 51 through a thrust bearing 65 and the other thereof is coupled with an end of aslant plate 67 disposed around therotatable shaft 55 through ahinged joint mechanism 69. Awobble plate 71 is disposed around the cylindrical portion of theslant plate 67 at the central portion thereof so as to swing in accordance with a rotation of theslant plate 67 through a thrust bearing 73. A groove is formed at aportion 75a of the periphery of thewobble plate 71 and engaged with arail plate 75b disposed in thecasing 47 so that it can be moved along an axial direction with preventing from rotating. Thewobble plate 71 and therail plate 75b constitute arotation preventing mechanism 77. Therotation preventing mechanism 77 is arranged such that it can move thewobble plate 71 in the direction along therotatable shaft 55 but it prevents thewobble plate 71 from rotating around therotatable shaft 55. - Pistons 81 are disposed in the
cylinder bores 45 of thecylinder block 49 and connected to the peripheral portion of thewobble plate 71 on the other end thereof throughpiston rods 83. - A
cylinder head 87 is disposed to the other end of thecylinder block 49 of thecasing 47 through avalve plate device 85. - The
valve plate device 85 includes a valve platemain body 85a, which has a not shown suction valve and adischarge valve 89, and aretainer 91. The suction valve and the discharge valve are formed on both of surfaces of the valve plate and stacked under seal members (not shown), respectively. Theretainer 91 is disposed so as to cover thedischarge valve 89. These components are assembled by abolt 93 so that they are integrated with the valve platemain body 85a. - Referring to Fig. 4, the
cylinder head 87 includes a firstcylinder head unit 95 disposed to the outside of the compressor and a secondcylinder head unit 97 interposed between the firstcylinder head unit 95 and thevalve plate device 85. - The first
cylinder head unit 95 includes abottom wall 101 and acylindrical side wall 103 standing vertically from the periphery of thebottom wall 101. Arefrigerant introduction hole 105 is formed at the center of thebottom wall 101. - Referring to Fig. 5, a plurality of, seven pieces in the embodiment,
partition walls 107 substantially extend radially inwardly from the positions of thecylindrical side wall 103 in a peripheral direction at approximately similar intervals and the extended end portions of thepartition walls 107 are located radially outwardly of therefrigerant introduction hole 105. With this structure, a plurality of, seven pieces in the embodiment,voids 109 which will be hereinafter referred to asfirst suction chambers 109, are partitioned byadjacent partition walls 107 and portions of theside wall 103 in correspondence to thecylinder bores 45. In addition, avoid 111 is formed by being surrounded by the extended end portions of thepartition walls 107. Note that, as can be seen from Fig. 5, the inner ends in the radial direction of thefirst suction chambers 109 are open to thevoid 111, respectively. The extended end portion of one of thepartition walls 107 has an elliptic cross section and ablind screw hole 115 is drilled thereto in an axial direction. The extended end portion of another one of thepartition walls 107 also has a circular cross section and a through-hole 113 for adischarge port 127 is drilled therethrough in the axial direction. Further,boss portions 117 are formed at the portions of theside wall 103 corresponding to the base portions of the respective thepartition walls 107 andscrew inserting holes 119 are drilled to theboss portions 117 in the axial direction. Note that theside wall 103, thepartition walls 107 and theboss portions 117 are designed to have the same height, respectively. - Referring to Fig. 6 in addition to Fig. 4, the second
cylinder head unit 97 includes abottom wall 121 and a cylindricalthick side wall 117 standing vertically from the peripheral edge of thebottom wall 121. Theside wall 117 has a plurality of through-holes 123 drilled thereto in correspondence to thevoids 109 of the firstcylinder head unit 95. The lateral cross section of each through-hole 123 is formed in an elliptic shape having a large area. Hereinafter, the through-holes 123 are referred to assecond suction chambers 123. When the first and secondcylinder head units first suction chambers 109 of the firstcylinder head unit 95 communicate with thesecond suction chambers 123 of the secondcylinder head unit 97 which correspond thereto. Further, thebottom wall 121 has through-holes 125 drilled thereto at the positions thereof corresponding to the above through-holes 113 and adischarge hole 127 is formed by the through-holes inside surface 129 of theside wall 117 is waved radially. - As reviewing in Fig. 4, a
discharge chamber 131 is partitioned by theside wall 117, thebottom wall 121 and thevalve plate device 85. Referring to Fig. 6 again, a plurality ofscrew inserting holes 133 are drilled to theside wall 117 in correspondence to thescrew inserting holes 119 of the firstcylinder head unit 95. As shown in Fig. 3, shaft portions ofbolts 135 pass through a plurality ofscrew inserting holes 133 and thescrew inserting holes 85b drilled to thevalve plate device 85 in correspondence to thescrew inserting holes 119 and are screwed intoscrew holes 49a drilled to thecylinder block 49, whereby the first and secondcylinder head units valve plate device 85 and thecylinder block 49 are fixed to each other. Note that while theside wall 117 is formed integrally with thebottom wall 121 in the present invention, theside wall 117 may be formed separately from thebottom wall 121 and thereafter the two members may be fixed to each other. - When the
rotatable shaft 55 is rotated by a not shown drive source in the reciprocating type compressor according to the first embodiment arranged as described above, therotor 61 is rotated thereby so that theslant plate 67 coupled with therotor 61 is rotated. The rotation of theslant plate 67 is converted into the axial reciprocating motions in the axial direction of thepistons 81 in the cylinder bores 45. - With the above arrangement, refrigerant gases flow from an external refrigerant circuit into the void 111 through
refrigerant introduction hole 105 and further flows intofirst suction chambers 109. The refrigerant gases having flowed into thefirst suction chambers 109 further flow into thesecond suction chambers 123 and then sucked into the cylinder bores 45 throughsuction ports 139. Thereafter, the refrigerant gases having been compressed by thepistons 81 are discharged into adischarge chamber 131 from the cylinder bores 45 through adischarge port 141 and flow to the external refrigerant circuit through thedischarge port 127. - As described above, the refrigerant passage from the
refrigerant introduction hole 105 to the cylinder bores 45 is formed of the void 111, thefirst suction chambers 109 and thesecond suction chambers 123. Therefore, the refrigerant gases having flowed from the external refrigerant circuit into the void 111 through therefrigerant introduction hole 105 flow into thefirst suction chambers 109 which correspond to the respective cylinder bores 45 and further are substantially isolated from each other. With this arrangement, when the refrigerant gases are sucked into the respective cylinder bores 45, the mutual dynamic interference of the refrigerant gases is reduced and thus the pulsation of the suction pressure of the refrigerant gases can be suppressed. As a result, it is possible to lower the noise level in the inside of a car. - Further, according to the present invention, a large pressure loss is not caused in the refrigerant passage from
refrigerant introduction hole 105 to the cylinder bores 45 because any of the void 111,first suction chambers 109 andsecond suction chambers 123 has a large volume. - Further, according to the present invention, since the refrigerant gases having flown from the external refrigerant circuit into the void through the
refrigerant introduction hole 105 is received once by thefirst suction chambers 109 which are isolated from each other, it is difficult for the amount of the refrigerant sucked by the cylinders to be affected by the change of the flow rate of the refrigerant supplied to the compressor, whereby the unpleasant noise generated from the parts such as awobble plate 71 which constitute a driving mechanism can be prevented. - Fig. 7 is a graph showing that the pulsation of suction pressure is suppressed by the present invention described above. In the graph, the ordinate shows the magnitude of suction gas pulsation (unit: dBEU, wherein EU is the abbreviation of engineering unit) and the abscissa shows the flow rate (unit: kg/hour) of liquid refrigerant in the liquid line of a refrigerating circuit (portion from a condensation vessel to an expanding function element). Note that the magnitude of suction gas pulsation of the ordinate is measured in the frequency range of 440 - 500 Hz, and curves 139 and 141, in which 0 dBEU is defined as 1 g/cm2 (0 dBEU = 1g/cm2), show the characteristics of the above conventional art 1 and the present invention, respectively. As apparent from the
curve 139 and thecurve 141, it can be found that the value of suction pressure pulsation of the present invention is always lower than that of the conventional art 1 regardless of the compensation of the flow rate of the liquid refrigerant. - Referring to Figs. 8A and 8B, the cylinder head of a reciprocating type compressor according to a second embodiment of the present invention is arranged similarly to the cylinder head shown in Fig. 3 to Fig. 6 except the structure of a void 111 is different.
- That is, the
void 111 is formed in a taper shape so that the diameter of the inner wall orpartition wall 107 thereof is gradually increased inwardly as well as a plurality of projectingfolds 107a are formed on the inner wall surface thereof. Each of the projectingfolds 107a has a size and shape of such a degree as not to cause a pressure loss. - In the reciprocating type compressor according to the second embodiment of the present invention arranged as described above, since the suction chamber of the cylinder head is formed in the taper shape, the pressure loss of suction gases is not clearly produced but the attenuation of pressure pulsation is more accelerated by the projecting
folds 107a. - Referring to Fig. 9, a first
cylinder head unit 95 according to a third embodiment of the present invention is arranged such that a plurality of straighteningplates 107b, each of which is composed of a plate member projecting in a direction perpendicular to the direction in which eachpartition wall 107 extends, are disposed to thepartition walls 107 on both the sides in the lengthwise direction thereof. Each straighteningplate 107b has a size and shape of such a degree as not to cause a pressure loss. - In the third embodiment of the present invention arranged as described above, pressure pulsation is more attenuated than that of the reciprocating type compressor of the first embodiment by the straightening
plates 107b provided with thepartition walls 107. - While the embodiments of the present invention have been described as to the reciprocating type compressor using the wobble plate, it is needless to say that the present invention is also applicable to a reciprocating type compressor which converts a rotating motion to the reciprocating motions of pistons by means of the rotary slant plate of conventional arts through shoes.
- As described above, according to the present invention, when refrigerant gases are sucked into the cylinder bores, it is possible to lower the noise level in the inside of a car because the mutual dynamic interference among the suction refrigerant gases can be reduced as well as the pulsation of the suction pressure of the refrigerant gases can be also suppressed.
- Further, since a large pressure loss is not produced in the refrigerant passage from the refrigerant introduction hole to the cylinder bores, it is possible to prevent the reduction of the refrigerating capability of the compressor.
- Furthermore, it is difficult for the amount of the refrigerant sucked into the cylinder to be affected by the change of the flow rate of the refrigerant supplied to the compressor, whereby the unpleasant noise generated from the parts constituting the driving mechanism can be prevented.
Claims (7)
- A reciprocating type compressor comprising:a cylinder block with a plurality of cylinder bores formed therein;a plurality of pistons received in said cylinder bores, respectively;a cylinder head connected to said cylinder block and having a refrigerant introduction hole;a suction chamber provided in said cylinder head and connecting said refrigerant introduction hole to said cylinder bores;said compressor compressing a fluid introduced into said cylinder bores by the reciprocating motion of said pistons in said cylinder bores;.
wherein said cylinder head comprises partition walls dividing said suction chamber into fluid paths for introducing the fluid into respective cylinder bores. - A reciprocating type compressor according to claim 1, wherein said partition walls are extended from portions of a side wall of the cylinder head towards said refrigerant introduction hole.
- A reciprocating type compressor according to claim 2, wherein said partition walls are extended from the portions of the side wall, the portions being spaced at an equiangular interval from each other.
- A reciprocating type compressor according to claim 1, wherein each of the suction chambers is formed in a taper shape having projecting folds on the outer periphery thereof.
- A reciprocating type compressor according to claim 1, wherein each of the partition walls has a straightening plate projecting in a direction perpendicular to the lengthwise direction thereof.
- A reciprocating type compressor according to claim 1, further comprising a rotation conversion mechanism for converting the rotating motion of a rotatable shaft into the reciprocating motion of said pistons in the direction of said rotatable shaft, said rotation conversion mechanism being one selected from a rotating swash plate mechanism and a wobble plate mechanism.
- A reciprocating type compressor according to claim 1, wherein said cylinder head is made of two divisional portions in an axial direction, one of said divisional portions being provided with a discharge chamber and a through hole, another one being provided with voids divided by partition walls to each other.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09493699A JP3899203B2 (en) | 1999-04-01 | 1999-04-01 | Reciprocating compressor |
JP9493699 | 1999-04-01 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1041285A2 true EP1041285A2 (en) | 2000-10-04 |
EP1041285A3 EP1041285A3 (en) | 2002-04-03 |
EP1041285B1 EP1041285B1 (en) | 2005-03-09 |
Family
ID=14123852
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000302566 Expired - Lifetime EP1041285B1 (en) | 1999-04-01 | 2000-03-28 | Reciprocating type compressor comprising a suction chamber and partition walls in a cylinder head |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1041285B1 (en) |
JP (1) | JP3899203B2 (en) |
DE (1) | DE60018497T2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1132617A2 (en) * | 2000-03-07 | 2001-09-12 | Sanden Corporation | Swash plate compressor cylinder head with partitions |
EP1637737A1 (en) * | 2004-09-10 | 2006-03-22 | Sanden Corporation | Multi-cylinder reciprocating compressor |
CN109145498A (en) * | 2018-09-12 | 2019-01-04 | 西安交通大学 | A kind of pipeline gas calculation method of compressor assembly |
US10253766B2 (en) | 2015-05-13 | 2019-04-09 | Carrier Corporation | Economized reciprocating compressor |
CN112412739A (en) * | 2019-08-22 | 2021-02-26 | 现代自动车株式会社 | Multistage compressor and control method thereof |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4810701B2 (en) * | 2001-07-24 | 2011-11-09 | 株式会社ヴァレオジャパン | Reciprocating refrigerant compressor |
DE102013207470B4 (en) | 2013-04-24 | 2018-04-05 | Bitzer Kühlmaschinenbau Gmbh | Refrigerant compressor |
DE102018205724B4 (en) * | 2018-04-16 | 2019-12-05 | Volkswagen Aktiengesellschaft | Compressor housing and method for mounting a compressor housing |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4070136A (en) * | 1973-05-11 | 1978-01-24 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Apparatus for lubricating a swash plate compressor |
JPS63143775U (en) * | 1987-03-11 | 1988-09-21 | ||
JPS63280875A (en) * | 1987-05-13 | 1988-11-17 | Toyota Autom Loom Works Ltd | Suction gas guide mechanism of swash plate type compressor |
JPH079233B2 (en) * | 1987-11-21 | 1995-02-01 | 株式会社豊田自動織機製作所 | Compressor |
JP3377112B2 (en) * | 1993-07-19 | 2003-02-17 | 株式会社豊田自動織機 | Reciprocating compressor |
-
1999
- 1999-04-01 JP JP09493699A patent/JP3899203B2/en not_active Expired - Fee Related
-
2000
- 2000-03-28 DE DE2000618497 patent/DE60018497T2/en not_active Expired - Fee Related
- 2000-03-28 EP EP20000302566 patent/EP1041285B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
None |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1132617A2 (en) * | 2000-03-07 | 2001-09-12 | Sanden Corporation | Swash plate compressor cylinder head with partitions |
EP1132617A3 (en) * | 2000-03-07 | 2003-01-29 | Sanden Corporation | Swash plate compressor cylinder head with partitions |
EP1637737A1 (en) * | 2004-09-10 | 2006-03-22 | Sanden Corporation | Multi-cylinder reciprocating compressor |
US7607900B2 (en) | 2004-09-10 | 2009-10-27 | Purdue Research Foundation | Multi-cylinder reciprocating compressor |
US10253766B2 (en) | 2015-05-13 | 2019-04-09 | Carrier Corporation | Economized reciprocating compressor |
CN109145498A (en) * | 2018-09-12 | 2019-01-04 | 西安交通大学 | A kind of pipeline gas calculation method of compressor assembly |
CN109145498B (en) * | 2018-09-12 | 2020-10-27 | 西安交通大学 | Pipeline airflow pulsation calculation method of compressor system |
CN112412739A (en) * | 2019-08-22 | 2021-02-26 | 现代自动车株式会社 | Multistage compressor and control method thereof |
Also Published As
Publication number | Publication date |
---|---|
DE60018497T2 (en) | 2005-07-28 |
DE60018497D1 (en) | 2005-04-14 |
EP1041285A3 (en) | 2002-04-03 |
EP1041285B1 (en) | 2005-03-09 |
JP3899203B2 (en) | 2007-03-28 |
JP2000291546A (en) | 2000-10-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN100363625C (en) | Compressor | |
KR970004813B1 (en) | Multiple-cylinder piston type refrigerant compressor | |
US4274813A (en) | Swash plate type compressor | |
US6318981B1 (en) | Two-cylinder type two-stage compression rotary compressor | |
KR20070049969A (en) | Rotary compressor | |
US4990073A (en) | Two-cylinder rotary compressor having improved valve cover structure | |
KR100304490B1 (en) | Improved single stage compressor to eliminate unbalance of drive shaft | |
US20060056990A1 (en) | Compressor having discharge mufflers | |
KR20030042418A (en) | Closed type rotary compressor | |
EP1041285B1 (en) | Reciprocating type compressor comprising a suction chamber and partition walls in a cylinder head | |
JPH1026080A (en) | Muffler structure for compressor | |
KR100208881B1 (en) | Hermetic compressor | |
US7344366B2 (en) | Hermetic compressor having a high pressure chamber | |
EP3376035B1 (en) | Rotary compressor | |
WO2016139873A1 (en) | Compressor | |
WO2021162039A1 (en) | Compressor | |
US6468050B2 (en) | Cylinder head assembly including partitions disposed in refrigerant introduction path and reciprocating compressor using the same | |
JPH02264189A (en) | Horizontal type rotary compressor | |
CN115013311B (en) | Compressor | |
KR102060472B1 (en) | Scroll compressor | |
JPH08240188A (en) | Multilple cylinder type rotary compressor | |
JP2001207961A (en) | Reciprocating compressor | |
EP0905377B1 (en) | Casted suction inlet | |
JP2993196B2 (en) | Swash plate compressor | |
KR20230136822A (en) | Automotive Orbiter Compressor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Kind code of ref document: A2 Designated state(s): DE FR |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
RIC1 | Information provided on ipc code assigned before grant |
Free format text: 7F 04B 39/12 A, 7F 04B 39/00 B, 7F 04B 27/10 B |
|
17P | Request for examination filed |
Effective date: 20021002 |
|
AKX | Designation fees paid |
Free format text: DE FR |
|
17Q | First examination report despatched |
Effective date: 20030318 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REF | Corresponds to: |
Ref document number: 60018497 Country of ref document: DE Date of ref document: 20050414 Kind code of ref document: P |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20051212 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20060323 Year of fee payment: 7 |
|
EN | Fr: translation not filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071002 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050331 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050309 |