EP0761973A2 - Gas compressor - Google Patents
Gas compressor Download PDFInfo
- Publication number
- EP0761973A2 EP0761973A2 EP96306183A EP96306183A EP0761973A2 EP 0761973 A2 EP0761973 A2 EP 0761973A2 EP 96306183 A EP96306183 A EP 96306183A EP 96306183 A EP96306183 A EP 96306183A EP 0761973 A2 EP0761973 A2 EP 0761973A2
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- EP
- European Patent Office
- Prior art keywords
- gas
- discharge
- openings
- block
- intake
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0021—Systems for the equilibration of forces acting on the pump
- F04C29/0035—Equalization of pressure pulses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
- F04C18/3446—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along more than one line or surface
Definitions
- the present invention relates to a gas compressor used in a refrigerator or air-conditioner and, more particularly, to a sliding-vane rotary compressor.
- FIG. 8 schematically shows the prior art sliding-vane rotary gas compressor in cross section.
- Fig. 9 is a view taken on line X-X of Fig. 8.
- This gas compressor has a rotor 2 rigidly secured to a rotor shaft 1.
- a motor not shown
- five vanes 3 slidably held in five slots (not shown), respectively, radially formed in the rotor 2 are rotated in contact with the inner wall of the cylinder chamber 4, thus compressing refrigerant gas.
- An intake chamber 6 is formed inside a front head 5.
- An intake port 7 for drawing in the refrigerant gas to be compressed from an evaporator (not shown) is formed over the intake chamber 6.
- Two intake holes 8 and 9 are formed in the front head 5 symmetrically about a point to place the intake chamber 6 and the cylinder chamber 4 in communication with each other. Accordingly, the refrigerant gas drawn in from the intake port 7 on the intake chamber 6 flows through the intake chamber 6 and through the intake holes 8, 9, as indicated by the arrow A. Finally, the gas is introduced into the cylinder chamber 4.
- Two discharge holes (not shown) corresponding to the intake holes 8 and 9 in the cylinder chamber 4 are formed in a rear-side block 10 on the side of the cylinder chamber 4 and located symmetrically with respect to a point.
- Discharge valves (not shown) are mounted in the discharge holes, respectively. As shown in Fig. 9, these discharge holes are in communication with openings 11 and 12, respectively, formed in the rear-side block 10 and connected with discharge passages 13 and 14, respectively, formed between the rear-side block 10 and a block 15 for an oil separator.
- These discharge passages 13 and 14 are connected to each other at 16 close to their ends. At this location 16, the oil separator, indicated by 17, for separating lubricating oil from the refrigerant gas is mounted.
- the compressed refrigerant gas discharged from the opening 11 or 12 in this way flows through the discharge passage 13 or 14 and is supplied into the oil separator 17, where the lubricating oil is separated from the refrigerant gas.
- the refrigerant gas is expelled to the outside from a discharge port 19 in a discharge chamber 18, as indicated by the arrow B.
- the two pulsating motions produced in the openings 11 and 12 of the cylinder chamber 4 are shifted in phase by a half wavelength, because the timing at which the gas is discharged from the openings 11 and 12 is designed as described above to smoothen the delivery of the gas. Therefore, the pulsating motions of the refrigerant gas should cancel out until the gas is delivered from the discharge port 19 after flowing through the discharge passage 13, the discharge passage 14, the oil separator 17, and the discharge chamber 18. Hence, discharging pulsating motions due to the fifth-order component of the rotational speed of the compressor should not be transmitted to the outside.
- the discharge passages 13 and 14 are different in length, as shown in Fig. 9.
- the pulsating motions are transmitted to the outside, producing noise.
- Use of a silencer may be generally contemplated to solve this problem.
- the whole machine is made bulky.
- the cost of fabricating the machine is increased greatly, thus presenting a new problem.
- a gas compressor comprising a gas compression portion, two discharge passages having the same length, and a common passage connected with both of the two discharge passages near their ends.
- the gas compression portion has two intake ports and two discharge ports corresponding to the intake ports, respectively.
- the two intake ports are located symmetrically with respect to a point. Gas is drawn into these two intake ports one after another by rotary motion of a plurality of vanes. The drawn gas is compressed by volume variations caused by the rotary motion of the vanes. The compressed gas is discharged from the two discharge ports successively.
- the two discharge passages are connected with the two discharge ports, respectively.
- the gas expelled from the two discharge ports in the gas compression portion produces pulsating motions according to the number of the vanes. These two pulsating motions are shifted in phase by a half wavelength.
- the two discharge passages connected with the two discharge ports are equal in length. Furthermore, the ends of the two discharge passages are connected with the common passage. Therefore, when the gas discharged from the two discharge ports in the gas compression portion flows through the common passage, the two pulsations of the expelled gas cancel out. As a consequence, the pulsating motions of the expelled gas are not readily transmitted to the outside.
- Fig. 1 is a partially cutaway cross section of a gas compressor according to the present invention.
- Fig. 2 is a view taken on line Y-Y of Fig. 1.
- the gas compressor comprises a gas compression portion 21, a casing 22 surrounding the gas compression portion 21, and a front head 23.
- the casing 22 has an opening at its one side.
- the front head 23 is mounted so as to close off the opening in the front head 23.
- the gas compression portion 21 comprises a cylindrical block 24, a control plate 25 rotatably mounted to the left end surface of the cylindrical block 24 as described later, and a rear-side block 26 firmly secured to the right end surface of the cylindrical block 24.
- the axial cross section of the inner surface of the cylindrical block 24 assumes an elliptical form.
- An elliptical cylinder chamber 27 is formed by these gas compression portion 21, the control plate 25, the cylindrical block 24, and the rear-side block 26.
- a rotor 30 has five vanes 29 slidably held in slits (not shown), and is housed in the cylinder chamber 27.
- This rotor 30 is mounted integrally with a rotor shaft 31.
- Bearing support holes 23a and 26a are formed in the front head 23 and the rear-side block 26, respectively, and have a diameter slightly larger than that of the rotor shaft 31.
- the left and right sides of the rotor shaft 31 are rotatably held in the holes 23a and 26a, respectively.
- One end of the rotor shaft 31 is connected to a motor (not shown). When the rotor shaft 31 is rotated, the five vanes 29 rotate in contact with the inner wall surface of the cylinder chamber 27, thus compressing refrigerant gas.
- An intake chamber 32 is formed inside the front head 23.
- the intake chamber 32 is provided with an intake port (not shown) for drawing the refrigerant gas to be compressed from an evaporator (not shown).
- the front head 23 has a boss 23b on the side of the cylindrical block 24.
- the aforementioned control plate 25 which is shaped like a disk fits over the boss 23b via a bearing 28 so as to be rotatable within a given range of angles.
- the control plate 25 is centrally provided with a fitting hole. Recesses or openings (not shown) are formed in given positions on the outer periphery of the control plate 25, and these recesses or openings are diametrically opposite to each other.
- the front head 23 is provided with the intake chamber 32, as shown in Fig. 1.
- the intake chamber 32 can register with any one of the recesses or openings (not shown).
- the compression volume of the cylinder chamber 27 can be adjusted by adjusting the position of the recess or opening registering with the intake chamber 32 according to the rotation of the control plate 25.
- the rear-side block 26 is fixedly mounted to the cylindrical block 24 by bolts 48, as shown in Fig. 2.
- Two discharge holes (not shown) corresponding to the recesses or openings (not shown) in the control plate 25 are formed in the rear-side block 26 on the side of the cylinder chamber 27 and located symmetrically with respect to a point.
- Discharge valves (not shown) are mounted in the discharge holes, respectively. As shown in Fig. 2, these discharge holes are in communication with openings 37 and 38, respectively, formed in the rear-side block.
- the discharge holes are also in communication with discharge holes 40 and 41, respectively, which are formed between the rear-side block 26 and an oil separator block 39 as described later.
- These discharge passages 40 and 41 are connected to each other near their ends, thus forming a common passage 49.
- An oil separator 42 consisting of a filter for separating lubricating oil from refrigerant gas is mounted in the common passage 49.
- the discharge passages 40 and 41 are equal in length.
- An oil reservoir 46 for storing the lubricating oil is formed at the bottom of the discharge chamber 44.
- Lubricating oil supply passages 47 extend through the rear-side block 26, the cylindrical block 24, and the front head 23 to permit the lubricating oil to be supplied from the oil reservoir 46 into the bearing support holes 23a and 26a.
- Fig. 3 shows the rear-side block in cross section.
- Fig. 4 shows the right side surface of the rear-side block.
- This rear-side block 26 has a given thickness and is shaped like a disk.
- the aforementioned bearing support hole 26a is formed in the center of the block 26 and designed to support the rotor shaft 31.
- the openings 37 and 38 are formed in the rear-side block 26 and extend in the direction of the thickness of the block 26.
- the openings 37 and 38 are located symmetrically with respect to a point.
- the openings 37 and 38 are connected to the starting points of grooves 261 and 262, respectively, for the discharge passages, respectively.
- the terminal points of the grooves 261 and 262 are located close to a recess 263 in which one end of the oil separator 42 is received.
- the terminal points of the grooves 261 and 262 are connected to each other in the recess 263.
- the grooves 261 and 262 for the discharge passages are equal in length.
- the groove 261 for one discharge passage is placed opposite to a groove 391 for one discharge passage, the groove 391 being formed in the oil separator block 39 described later. In this way, the discharge passage 40 shown in Fig. 2 is formed.
- the groove 262 for the other discharge passage is placed opposite to a groove 392 for the other discharge passage, the groove 392 being formed in the oil separator block 39.
- the discharge passage 41 shown in Fig. 2 is formed.
- a plurality of mounting holes 264 for mounting the rear-side block 26 to the left side surface of the cylindrical block 24 by the bolts 48 are formed in given positions inside the rear-side block 26. Also, threaded holes 265 for mounting the oil separator block 39 to the rear-side block 26 are formed in given locations inside the block 26.
- Fig. 5 shows this block 39 in cross section.
- Fig. 6 shows the left side surface of the block 39.
- Fig. 7 shows the right side surface of the block 39.
- the block 39 for the oil separator is provided with the grooves 391 and 392 for the discharge passages.
- the grooves 391 and 392 form the discharge passages 40 and 41, respectively, and are located opposite to the grooves 261 and 262, respectively, which are formed in the rear-side block 26.
- the grooves 391 and 392 extend toward a cylindrical portion 394 forming the common passage in which the oil separator 42 is accommodated, the ends of the grooves 391 and 392 being located close to the cylindrical portion 394.
- the grooves 391 and 392 are both connected to the cylindrical portion 394.
- the grooves 391 and 392 are equal in length.
- the top and bottom sides of the cylindrical portion 394 are open.
- a recess 395 in which the central portion of the rear-side block 26 is accommodated is formed near the bottom of the oil separator block 39.
- Mounting holes 396 for mounting the block 39 to the rear-side block are formed in given locations inside the block 39.
- the compressed refrigerant gas discharging from the openings 37 and 38 in this manner flows through the discharge passage 40 or 41 and enters the oil separator 42, where the lubricating oil is separated from the refrigerant gas.
- the refrigerant gas is discharged to the outside from the discharge port (not shown) in the discharge chamber 44.
- the pressure is not constant. Rather, high-order pressure variations are produced according to the rotational speed of the rotor 30. Because there exist five vanes 3, the discharge valves in the two openings 37 and 38 produce five pulsating motions per rotation of the rotor 30.
- the two pulsating motions produced in the openings 37 and 38 in communication with the discharge holes in the cylinder chamber 27 are shifted in phase by a half wavelength.
- the two discharge passages 40 and 41 connected with the two openings 37 and 38 are equal in length. Furthermore, the ends of the two discharge passages 40 and 41 are connected to the common passage 49. Therefore, the pulsating motions of the discharged gas from the two openings 37 and 38 in the cylinder chamber 27 cancel out each other when the gas flows through the common passage 49. Consequently, the pulsating motions of the discharged gas are not readily transmitted to the outside.
- the discharge passages 40 and 41 having the same length are connected with the openings 37 and 38 which are in communication with the discharge holes, respectively, in the cylinder chamber 27.
- the ends of these discharge passages 40 and 41 are connected with the common passage 49.
- the pulsating motions of the discharged gas from the two openings 37 and 38 in the cylinder chamber 27 which are shifted in phase by a half wavelength cancel out each other when the gas flows through the common passage 49. Consequently, the pulsating motions of the discharged gas are not readily transmitted to the outside. Therefore, in the present embodiment, the pulsations of the discharged gas can be suppressed without increasing the size of the whole machine and without incurring a great increase in the cost of fabricating the machine. As a result, noise due to the pulsations can be reduced.
- the gas compressor is provided with the cylinder chamber 27 having a variable compression volume.
- the invention can also be applied to a gas compressor in which the cylinder chamber 27 has a fixed compression volume.
- the discharge passages 40 and 41 are connected together near their ends to form the common passage 49.
- the oil separator 42 is positioned in this common passage 49.
- a separate passage where the oil separator 42 is mounted may be connected with the common passage 49.
- two discharge passages having the same length are connected with two discharge ports, respectively, in the gas compression portion.
- the ends of these two discharge passages are connected with a common passage.
- Pulsating motions of the gas discharged from the two discharge ports in the gas compression portion are shifted in phase by a half wavelength. These pulsating motions cancel out each other when the gas flows through the common passage. In consequence, the pulsating motions of the discharged gas are not readily transmitted to the outside. Accordingly, in the present invention, the pulsations of the discharged gas can be suppressed without increasing the size of the whole machine and without incurring a great increase in the cost of fabricating the machine. As a result, noise due to the pulsations can be reduced.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary Pumps (AREA)
Abstract
A gas compressor has a cylinder chamber (27) provided with discharge holes. Openings (37,38) are in communication with respective discharge holes. Discharge passages (40,41) having the same length are connected with respective openings (37,38). The ends of the discharge passages are connected with a common passage (49). During operation of the cylinder chamber (27), discharge valves cause the expelled gas to produce pulsations on the upstream side of the two openings (37,38). The pulsations are shifted in phase by a half wavelength. Noise due to the pulsations is reduced, because the pulsations of the expelled gas cancel out each other when the gas flows through the common passage (49).
Description
- The present invention relates to a gas compressor used in a refrigerator or air-conditioner and, more particularly, to a sliding-vane rotary compressor.
- Fig. 8 schematically shows the prior art sliding-vane rotary gas compressor in cross section. Fig. 9 is a view taken on line X-X of Fig. 8. This gas compressor has a rotor 2 rigidly secured to a
rotor shaft 1. When the rotor 2 is driven by a motor (not shown), five vanes 3 slidably held in five slots (not shown), respectively, radially formed in the rotor 2 are rotated in contact with the inner wall of thecylinder chamber 4, thus compressing refrigerant gas. - An
intake chamber 6 is formed inside afront head 5. Anintake port 7 for drawing in the refrigerant gas to be compressed from an evaporator (not shown) is formed over theintake chamber 6. Twointake holes front head 5 symmetrically about a point to place theintake chamber 6 and thecylinder chamber 4 in communication with each other. Accordingly, the refrigerant gas drawn in from theintake port 7 on theintake chamber 6 flows through theintake chamber 6 and through theintake holes cylinder chamber 4. - Two discharge holes (not shown) corresponding to the
intake holes cylinder chamber 4 are formed in a rear-side block 10 on the side of thecylinder chamber 4 and located symmetrically with respect to a point. Discharge valves (not shown) are mounted in the discharge holes, respectively. As shown in Fig. 9, these discharge holes are in communication withopenings 11 and 12, respectively, formed in the rear-side block 10 and connected withdischarge passages side block 10 and ablock 15 for an oil separator. Thesedischarge passages location 16, the oil separator, indicated by 17, for separating lubricating oil from the refrigerant gas is mounted. - In this prior art sliding-vane rotary gas compressor, when the motor (not shown) rotates the rotor 2 to thereby actuate the vanes 3, the refrigerant gas is drawn into the
intake chamber 6 from theintake port 7 as indicated by the arrow A. Then, the gas passes through theintake hole 8 and is drawn into thecylinder chamber 4, where the gas is compressed. The gas is forced out of the opening 12 corresponding to theintake hole 8. Simultaneously with this operation, intake into theintake hole 8 in thecylinder chamber 4 ends. Then, the refrigerant gas is started to be drawn into thecylinder chamber 4 from theintake hole 9, whereby compression is started. When this compression ends, the refrigerant gas is discharged from theopening 11 corresponding to theintake hole 9. Accordingly, the refrigerant gas is discharged from theopenings 11 and 12 one after another and intermittently. - The compressed refrigerant gas discharged from the
opening 11 or 12 in this way flows through thedischarge passage oil separator 17, where the lubricating oil is separated from the refrigerant gas. As a result, only the refrigerant gas is expelled to the outside from adischarge port 19 in adischarge chamber 18, as indicated by the arrow B. - Since the gas is discharged from the two
openings 11 and 12 in thecylinder chamber 4 intermittently as described above, the pressure is not constant. Rather, higher-order pressure variations are produced according to the rotational frequency of the rotor 2. Because each discharge valve has the five vanes 3 in the twoopenings 11 and 12, the discharged gas produces five pulsating motions per rotation of the rotor 2. - The two pulsating motions produced in the
openings 11 and 12 of thecylinder chamber 4 are shifted in phase by a half wavelength, because the timing at which the gas is discharged from theopenings 11 and 12 is designed as described above to smoothen the delivery of the gas. Therefore, the pulsating motions of the refrigerant gas should cancel out until the gas is delivered from thedischarge port 19 after flowing through thedischarge passage 13, thedischarge passage 14, theoil separator 17, and thedischarge chamber 18. Hence, discharging pulsating motions due to the fifth-order component of the rotational speed of the compressor should not be transmitted to the outside. - However, the
discharge passages - Accordingly, it is an object of the present invention to provide a sliding-vane rotary gas compressor in which pulsations of discharging refrigerant gas are suppressed without increasing the size of the whole machine and without increasing the fabrication cost, thereby reducing noise due to the pulsations.
- The above object is achieved in accordance with the teachings of the invention by a gas compressor comprising a gas compression portion, two discharge passages having the same length, and a common passage connected with both of the two discharge passages near their ends. The gas compression portion has two intake ports and two discharge ports corresponding to the intake ports, respectively. The two intake ports are located symmetrically with respect to a point. Gas is drawn into these two intake ports one after another by rotary motion of a plurality of vanes. The drawn gas is compressed by volume variations caused by the rotary motion of the vanes. The compressed gas is discharged from the two discharge ports successively. The two discharge passages are connected with the two discharge ports, respectively.
- In this gas compressor according to the invention, during operation of the gas compression portion, the gas expelled from the two discharge ports in the gas compression portion produces pulsating motions according to the number of the vanes. These two pulsating motions are shifted in phase by a half wavelength. The two discharge passages connected with the two discharge ports are equal in length. Furthermore, the ends of the two discharge passages are connected with the common passage. Therefore, when the gas discharged from the two discharge ports in the gas compression portion flows through the common passage, the two pulsations of the expelled gas cancel out. As a consequence, the pulsating motions of the expelled gas are not readily transmitted to the outside.
- Other objects and features of the invention will appear in the course of the description thereof, which follows.
- Fig. 1 is a cross-sectional view of a gas compressor according to the present invention;
- Fig. 2 is a view taken on line Y-Y of Fig. 1;
- Fig. 3 is a cross-sectional view of a rear-side block included in the gas compressor shown in Figs. 1 and 2;
- Fig. 4 is a right side elevation of the rear-side block shown in Fig. 3;
- Fig. 5 is a cross-sectional view of an oil separator block included in the gas compressor shown in Fig. 1;
- Fig. 6 is a left side elevation of the oil separator block shown in Fig. 5;
- Fig. 7 is a right side elevation of the oil separator block shown in Figs. 5 and 6;
- Fig. 8 is a schematic cross section of the prior art sliding-vane rotary gas compressor; and
- Fig. 9 is a view taken on line X-X of Fig. 8.
- The preferred embodiments of the present invention are hereinafter described in detail by referring to Figs. 1-7.
- Fig. 1 is a partially cutaway cross section of a gas compressor according to the present invention. Fig. 2 is a view taken on line Y-Y of Fig. 1. As shown in Fig. 1, the gas compressor comprises a
gas compression portion 21, acasing 22 surrounding thegas compression portion 21, and afront head 23. Thecasing 22 has an opening at its one side. Thefront head 23 is mounted so as to close off the opening in thefront head 23. - The
gas compression portion 21 comprises acylindrical block 24, acontrol plate 25 rotatably mounted to the left end surface of thecylindrical block 24 as described later, and a rear-side block 26 firmly secured to the right end surface of thecylindrical block 24. The axial cross section of the inner surface of thecylindrical block 24 assumes an elliptical form. Anelliptical cylinder chamber 27 is formed by thesegas compression portion 21, thecontrol plate 25, thecylindrical block 24, and the rear-side block 26. - A
rotor 30 has fivevanes 29 slidably held in slits (not shown), and is housed in thecylinder chamber 27. Thisrotor 30 is mounted integrally with arotor shaft 31. Bearing support holes 23a and 26a are formed in thefront head 23 and the rear-side block 26, respectively, and have a diameter slightly larger than that of therotor shaft 31. The left and right sides of therotor shaft 31 are rotatably held in theholes 23a and 26a, respectively. One end of therotor shaft 31 is connected to a motor (not shown). When therotor shaft 31 is rotated, the fivevanes 29 rotate in contact with the inner wall surface of thecylinder chamber 27, thus compressing refrigerant gas. - An
intake chamber 32 is formed inside thefront head 23. Theintake chamber 32 is provided with an intake port (not shown) for drawing the refrigerant gas to be compressed from an evaporator (not shown). - The
front head 23 has a boss 23b on the side of thecylindrical block 24. Theaforementioned control plate 25 which is shaped like a disk fits over the boss 23b via abearing 28 so as to be rotatable within a given range of angles. Thecontrol plate 25 is centrally provided with a fitting hole. Recesses or openings (not shown) are formed in given positions on the outer periphery of thecontrol plate 25, and these recesses or openings are diametrically opposite to each other. Thefront head 23 is provided with theintake chamber 32, as shown in Fig. 1. Theintake chamber 32 can register with any one of the recesses or openings (not shown). The compression volume of thecylinder chamber 27 can be adjusted by adjusting the position of the recess or opening registering with theintake chamber 32 according to the rotation of thecontrol plate 25. - The rear-
side block 26 is fixedly mounted to thecylindrical block 24 bybolts 48, as shown in Fig. 2. Two discharge holes (not shown) corresponding to the recesses or openings (not shown) in thecontrol plate 25 are formed in the rear-side block 26 on the side of thecylinder chamber 27 and located symmetrically with respect to a point. Discharge valves (not shown) are mounted in the discharge holes, respectively. As shown in Fig. 2, these discharge holes are in communication withopenings side block 26 and anoil separator block 39 as described later. These dischargepassages common passage 49. Anoil separator 42 consisting of a filter for separating lubricating oil from refrigerant gas is mounted in thecommon passage 49. Thedischarge passages - The space surrounded by the rear-
side block 26 and also by thecasing 22 forms adischarge chamber 44 having a discharge port (not shown) in communication with the outside. Anoil reservoir 46 for storing the lubricating oil is formed at the bottom of thedischarge chamber 44. Lubricatingoil supply passages 47 extend through the rear-side block 26, thecylindrical block 24, and thefront head 23 to permit the lubricating oil to be supplied from theoil reservoir 46 into thebearing support holes 23a and 26a. - The structure of the rear-
side block 26 is next described in detail. Fig. 3 shows the rear-side block in cross section. Fig. 4 shows the right side surface of the rear-side block. - This rear-
side block 26 has a given thickness and is shaped like a disk. The aforementionedbearing support hole 26a is formed in the center of theblock 26 and designed to support therotor shaft 31. Theopenings side block 26 and extend in the direction of the thickness of theblock 26. Theopenings openings grooves grooves recess 263 in which one end of theoil separator 42 is received. The terminal points of thegrooves recess 263. Thegrooves - The
groove 261 for one discharge passage is placed opposite to agroove 391 for one discharge passage, thegroove 391 being formed in theoil separator block 39 described later. In this way, thedischarge passage 40 shown in Fig. 2 is formed. Similarly, thegroove 262 for the other discharge passage is placed opposite to agroove 392 for the other discharge passage, thegroove 392 being formed in theoil separator block 39. Thus, thedischarge passage 41 shown in Fig. 2 is formed. - A plurality of mounting
holes 264 for mounting the rear-side block 26 to the left side surface of thecylindrical block 24 by thebolts 48 are formed in given positions inside the rear-side block 26. Also, threadedholes 265 for mounting theoil separator block 39 to the rear-side block 26 are formed in given locations inside theblock 26. - The structure of the
block 39 for the oil separator is next described in detail. Fig. 5 shows thisblock 39 in cross section. Fig. 6 shows the left side surface of theblock 39. Fig. 7 shows the right side surface of theblock 39. - The
block 39 for the oil separator is provided with thegrooves grooves discharge passages grooves side block 26. Thegrooves cylindrical portion 394 forming the common passage in which theoil separator 42 is accommodated, the ends of thegrooves cylindrical portion 394. Thegrooves cylindrical portion 394. Thegrooves cylindrical portion 394 are open. Arecess 395 in which the central portion of the rear-side block 26 is accommodated is formed near the bottom of theoil separator block 39. Mountingholes 396 for mounting theblock 39 to the rear-side block are formed in given locations inside theblock 39. - The operation of the machine constructed in this way is described below. When the motor (not shown) drives the
rotor 30 to thereby activate thevanes 29, refrigerant gas is drawn into theintake chamber 32 through the intake port (not shown). The gas then flows through one recess or opening (not shown) in thecontrol plate 25, and is introduced into thecylinder chamber 27, where the gas is compressed. Then, the gas is expelled from the opening 38 (see Fig. 2). Concurrently with this operation, the intake of the gas from the recess or opening in thecontrol plate 25 inside thecylinder chamber 27 ends. Then, the refrigerant gas from the other recess or opening in thecontrol plate 25 is started to be forced into thecylinder chamber 27, and compression is initiated. When this compression ends, the refrigerant gas is discharged from theopening 37. Accordingly, the refrigerant gas is expelled from theopenings - The compressed refrigerant gas discharging from the
openings discharge passage oil separator 42, where the lubricating oil is separated from the refrigerant gas. The refrigerant gas is discharged to the outside from the discharge port (not shown) in thedischarge chamber 44. - When the gas compressor is operated in this way, a pressure difference is developed between the
discharge chamber 44 and thebearing support holes 23a, 26a. Thedischarge chamber 44 is at a higher pressure. This forces the lubricating oil in theoil reservoir 46 inside thedischarge chamber 44 into thebearing support holes 23a and 26a through the lubricatingoil supply passages 47. Then, the oil is used to lubricate sliding parts. - Since the gas is intermittently expelled from the
openings cylinder chamber 27 as described above, the pressure is not constant. Rather, high-order pressure variations are produced according to the rotational speed of therotor 30. Because there exist five vanes 3, the discharge valves in the twoopenings rotor 30. - The two pulsating motions produced in the
openings cylinder chamber 27 are shifted in phase by a half wavelength. The twodischarge passages openings discharge passages common passage 49. Therefore, the pulsating motions of the discharged gas from the twoopenings cylinder chamber 27 cancel out each other when the gas flows through thecommon passage 49. Consequently, the pulsating motions of the discharged gas are not readily transmitted to the outside. - As described thus far, in the present embodiment, the
discharge passages openings cylinder chamber 27. The ends of thesedischarge passages common passage 49. The pulsating motions of the discharged gas from the twoopenings cylinder chamber 27 which are shifted in phase by a half wavelength cancel out each other when the gas flows through thecommon passage 49. Consequently, the pulsating motions of the discharged gas are not readily transmitted to the outside. Therefore, in the present embodiment, the pulsations of the discharged gas can be suppressed without increasing the size of the whole machine and without incurring a great increase in the cost of fabricating the machine. As a result, noise due to the pulsations can be reduced. - In the description of the above embodiment, the gas compressor is provided with the
cylinder chamber 27 having a variable compression volume. The invention can also be applied to a gas compressor in which thecylinder chamber 27 has a fixed compression volume. - In the above embodiment, the
discharge passages common passage 49. Theoil separator 42 is positioned in thiscommon passage 49. Alternatively, a separate passage where theoil separator 42 is mounted may be connected with thecommon passage 49. - As described thus far, in the gas compressor according to the present invention, two discharge passages having the same length are connected with two discharge ports, respectively, in the gas compression portion. The ends of these two discharge passages are connected with a common passage. Pulsating motions of the gas discharged from the two discharge ports in the gas compression portion are shifted in phase by a half wavelength. These pulsating motions cancel out each other when the gas flows through the common passage. In consequence, the pulsating motions of the discharged gas are not readily transmitted to the outside. Accordingly, in the present invention, the pulsations of the discharged gas can be suppressed without increasing the size of the whole machine and without incurring a great increase in the cost of fabricating the machine. As a result, noise due to the pulsations can be reduced.
- The aforegoing description has been given by way of example only and it will be appreciated by a person skilled in the art that modifications can be made without departing from the scope of the present invention.
Claims (2)
- A gas compressor comprising:a gas compression portion (21) having an odd number of vanes (3), two intake ports, and two discharge ports corresponding to said two intake ports, said gas compression portion (21) being designed to rotate said vanes (3) for drawing gas into said gas compression portion (21) through said two intake ports one after another so as to compress the gas by volume changes caused by the rotation of said vanes (3) and to permit the compressed gas to be expelled from said two discharge ports one after another;two discharge passages (40,41) connected with said two discharge ports, respectively, in the gas compression portion; anda common passage (49) connected to said two discharge passages (40,41) at a location close to ends of said two discharge passages (40,41),characterised in that the two discharge passages (40,41) are of the same length.
- A gas compressor comprising:a gas compression portion (21) having an odd number of vanes (3), two intake ports, and two discharge ports corresponding to said two intake ports, respectively, and located symmetrically with respect to a point, said gas compression portion (21) being designed to rotate said vanes (3) for drawing gas into said gas compression portion (21) through said two intake ports one after another so as to compress the gas by volume changes caused by the rotation of said vanes (3) and to permit the compressed gas to be expelled from said two discharge ports one after another;two discharge passages (40,41) having the same length and connected with said two discharge ports, respectively, in the gas compression portion; anda common passage (49) connected to said two discharge passages (40,41) at locations close to ends of said two discharge passages (40,41).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23137295A JPH0979156A (en) | 1995-09-08 | 1995-09-08 | Gas compressor |
JP231372/95 | 1995-09-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0761973A2 true EP0761973A2 (en) | 1997-03-12 |
EP0761973A3 EP0761973A3 (en) | 1998-05-13 |
Family
ID=16922594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96306183A Withdrawn EP0761973A3 (en) | 1995-09-08 | 1996-08-23 | Gas compressor |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0761973A3 (en) |
JP (1) | JPH0979156A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1443213A1 (en) * | 2001-10-16 | 2004-08-04 | Ebara Corporation | Vane type rotary machine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002161854A (en) * | 2000-11-29 | 2002-06-07 | Zexel Valeo Climate Control Corp | Compressor |
JP3987697B2 (en) * | 2000-12-22 | 2007-10-10 | カルソニックコンプレッサー株式会社 | Gas compressor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57151090A (en) * | 1981-03-12 | 1982-09-18 | Mitsubishi Heavy Ind Ltd | Rotary compressor |
JPS59200088A (en) * | 1983-04-26 | 1984-11-13 | Toyoda Autom Loom Works Ltd | Rotary compressor |
JPS63263284A (en) * | 1987-04-20 | 1988-10-31 | Koyo Seiko Co Ltd | Vane pump |
EP0481347A1 (en) * | 1990-10-11 | 1992-04-22 | Toyoda Koki Kabushiki Kaisha | Vane pump |
-
1995
- 1995-09-08 JP JP23137295A patent/JPH0979156A/en active Pending
-
1996
- 1996-08-23 EP EP96306183A patent/EP0761973A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57151090A (en) * | 1981-03-12 | 1982-09-18 | Mitsubishi Heavy Ind Ltd | Rotary compressor |
JPS59200088A (en) * | 1983-04-26 | 1984-11-13 | Toyoda Autom Loom Works Ltd | Rotary compressor |
JPS63263284A (en) * | 1987-04-20 | 1988-10-31 | Koyo Seiko Co Ltd | Vane pump |
EP0481347A1 (en) * | 1990-10-11 | 1992-04-22 | Toyoda Koki Kabushiki Kaisha | Vane pump |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 006, no. 256 (M-179), 15 December 1982 & JP 57 151090 A (MITSUBISHI JUKOGYO KK), 18 September 1982, * |
PATENT ABSTRACTS OF JAPAN vol. 009, no. 067 (M-366), 27 March 1985 & JP 59 200088 A (TOYODA JIDO SHOKKI SEISAKUSHO KK), 13 November 1984, * |
PATENT ABSTRACTS OF JAPAN vol. 013, no. 060 (M-796), 10 February 1989 & JP 63 263284 A (KOYO SEIKO CO LTD), 31 October 1988, * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1443213A1 (en) * | 2001-10-16 | 2004-08-04 | Ebara Corporation | Vane type rotary machine |
US7056107B2 (en) * | 2001-10-16 | 2006-06-06 | Ebara Corporation | Vane type rotary machine |
EP1443213A4 (en) * | 2001-10-16 | 2006-12-06 | Ebara Corp | Vane type rotary machine |
Also Published As
Publication number | Publication date |
---|---|
EP0761973A3 (en) | 1998-05-13 |
JPH0979156A (en) | 1997-03-25 |
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