EP2873864B1 - Rotary compressor - Google Patents
Rotary compressor Download PDFInfo
- Publication number
- EP2873864B1 EP2873864B1 EP13810070.6A EP13810070A EP2873864B1 EP 2873864 B1 EP2873864 B1 EP 2873864B1 EP 13810070 A EP13810070 A EP 13810070A EP 2873864 B1 EP2873864 B1 EP 2873864B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- refrigerant
- cylinder
- discharge
- oil
- space
- 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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Links
- 239000003507 refrigerant Substances 0.000 claims description 108
- 230000000149 penetrating effect Effects 0.000 claims description 20
- 238000005192 partition Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
Images
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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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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
- F04C18/356—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 outer member
- F04C18/3562—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 outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation
- F04C18/3564—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 outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
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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
- F04C29/04—Heating; Cooling; Heat insulation
-
- 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
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- 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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
Definitions
- the present invention relates to a rotary compressor used in an air conditioner, a freezing machine, a blower and a water heater.
- a rotary compressor is widely used in an electric appliance such as an air conditioner, a heating system and a water heater.
- an electric appliance such as an air conditioner, a heating system and a water heater.
- a technique for suppressing deterioration of efficiency caused when refrigerant (sucked refrigerant) sucked into a compression chamber receives heat from environment i.e., suppressing so-called heat loss.
- a rotary compressor of patent document 1 has a hermetic space in a suction-side portion of a cylinder as means for suppressing heat-reception of sucked refrigerant. This hermetic space restrains heat from being transmitted from high temperature refrigerant in a hermetic container to an inner wall of the cylinder.
- a stagnation space defined by barriers is provided in a first muffler chamber communicating a first cylinder chamber.
- the stagnation space overlaps with a refrigerant-gas inlet side of the first cylinder chamber, the inlet side being bordered by a center plane, as viewed in a direction of a center axis of the first cylinder chamber.
- the high-temperature, high-pressure refrigerant gas is unlikely to enter into the stagnation space, so that heat is less absorbed to the inlet side of the first cylinder chamber.
- a compressor of patent document 3 has a structure where cylinders and thin plate shaped port plates provided with delivering ports which deliver refrigerant compressed by the cylinders are provided between a first bearing member and a second bearing member arranged in a sealed case. On the first bearing member side, a four-side surrounded delivering space communicating with the delivering port which performs delivery in the sealed case is formed.
- the present invention provides a rotary compressor according to claim 1.
- the rotary compressor of the present invention by minimizing a capacity of the refrigerant discharge space formed between the end plate member and the closing member, it is also possible to minimize the range of high temperature compressed refrigerant. According to this, since it is possible to restrain the temperature of the end plate member from rising, it is possible to restrain heat of the compressed refrigerant from moving toward the sucked refrigerant through the end plate member and thus, volume efficiency is enhanced.
- a first exemplary compressor comprises: a hermetic container having an oil reservoir; a cylinder placed in the hermetic container; a piston placed in the cylinder; an end plate member mounted on the cylinder to form a cylinder chamber between the cylinder and the piston; a vane which partitions the cylinder chamber into a suction chamber and a discharge chamber; a suction port for supplying refrigerant to be compressed into the suction chamber; a discharge port which is formed in the end plate member and which discharges the compressed refrigerant from the discharge chamber; a valve provided in the discharge port for adjusting a discharge amount of the refrigerant; a valve stop for restricting motion of the valve; a refrigerant discharge space which is provided in the end plate member that closes the cylinder and in which the refrigerant discharged from the discharge chamber through the discharge port can stay; a closing member mounted on the end plate member; and one or more penetrating flow paths for discharging the refrigerant from the refrigerant discharge space into the hermetic
- Another examplary rotary compressor may comprise: a hermetic container having an oil reservoir; a shaft placed in the hermetic container; a cylinder placed in the hermetic container; a piston placed in the cylinder and connected to the shaft; an end plate member mounted on the cylinder to form a cylinder chamber between the cylinder and the piston; a vane which partitions the cylinder chamber into a suction chamber and a discharge chamber; a suction port for supplying refrigerant to be compressed into the suction chamber; a discharge port which is formed in the end plate member and which discharges the compressed refrigerant from the discharge chamber; a valve provided in the discharge port for adjusting a discharge amount of the refrigerant; a valve stop for restricting motion of the valve; a refrigerant discharge space which is provided in the end plate member that closes the cylinder and in which the refrigerant discharged from the discharge chamber through the discharge port can stay; a closing member mounted on the end plate member; and a penetrating flow path for discharging
- the refrigerant discharge space includes a space into which a device for fixing the valve stop can be inserted. According to this aspect, since it becomes easy to fix the valve stop and the valve by means of a rivet or a bolt, mass productivity is enhanced.
- the end plate member includes an oil retaining section for taking in a portion of oil stored in the oil reservoir.
- oil retained in the oil retaining section functions as heat insulating material, it is possible to restrain heat of refrigerant (compressed refrigerant) in the refrigerant discharge space from moving toward refrigerant (sucked refrigerant) sucked into the cylinder chamber through the lower bearing member, volume efficiency is enhanced.
- the oil retaining section is configured such that a flow of the oil which is taken in is suppressed more than the oil reservoir. According to this aspect, since heat insulating properties of oil retained in the oil retaining section is enhanced, the volume efficiency is further enhanced.
- a muffler space is provided between the penetrating flow path and an interior of the hermetic container.
- refrigerant compressed by the second compressing block merges with refrigerant compressed by the first compressing block in the interior space of the first closing member, i.e., in the refrigerant discharge space (muffler space) on the side of an upper bearing member.
- a rotary compressor 100 of an example not falling under the scope of the claims includes a hermetic container 1, a motor 2, a compressing mechanism 102 and a shaft 4.
- the compressing mechanism 102 is placed at a lower location in the hermetic container 1.
- the motor 2 is placed in the hermetic container 1 at a location above the compressing mechanism 102.
- the compressing mechanism 102 and the motor 2 are connected to each other through the shaft 4.
- a terminal 21 for supplying electricity to the motor 2 is provided on an upper portion of the hermetic container 1 2.
- An oil reservoir 22 for retaining lubricant oil is formed in a bottom of the hermetic container 1.
- the motor 2 is composed of a stator 17 and a rotor 18.
- the stator 17 is fixed to an inner wall of the hermetic container 1.
- the rotor 18 is fixed to the shaft 4.
- the rotor 18 and the shaft 4 are driven and rotated by the motor 2.
- the upper portion of the hermetic container 1 is provided with a discharge pipe 11.
- the discharge pipe 11 penetrates the upper portion of the hermetic container 1 and opens toward an interior space 13 of the hermetic container 1.
- the discharge pipe 11 functions as a discharge flow path through which refrigerant compressed by the compressing mechanism 102 is introduced to outside of the hermetic container 1.
- the rotary compressor 100 When the rotary compressor 100 operates, the interior space 13 of the hermetic container 1 is filled with compressed refrigerant. That is, the rotary compressor 100 is a high pressure shell-type compressor. According to the high pressure shell-type rotary compressor 100, since it is possible to cool the motor 2 by refrigerant, it is possible to expect that motor efficiency is enhanced.
- the compressing mechanism 102 is operated by the motor 2 to compress refrigerant. More specifically, the compressing mechanism 102 includes a first compressing block 3, a second compressing block 30, an upper bearing member 6, a lower bearing member 7, a middle plate 38, a first closing member 9 (first muffler member) and a second closing member 10 (second muffler member). Refrigerant is compressed by the first compressing block 3 or the second compressing block 30. The first compressing block 3 and the second compressing block 30 are immersed in oil stored in the oil reservoir 22. In this embodiment, the first compressing block 3 is composed of parts which are in common with parts configuring the second compressing block 30. Therefore, the first compressing block 3 has the same suction capacity as that of the second compressing block 30.
- the first compressing block 3 is composed of a first cylinder 5, a first piston 8, a first vane 32, a first suction port 19, a first discharge port 40 and a first spring 36.
- the second compressing block 30 is composed of a second cylinder 15, a second piston 28, a second vane 33, a second suction port 20, a second discharge port 41 and a second spring 37.
- the first cylinder 5 and the second cylinder 15 are concentrically placed.
- the shaft 4 includes a first eccentric portion 4a and a second eccentric portion 4b.
- the first eccentric portion 4a and the second eccentric portion 4b project outward in a radial direction of the shaft 4.
- the first piston 8 and the second piston 28 are placed in the first cylinder 5 and the second cylinder 15, respectively.
- the first piston 8 is mounted on the first eccentric portion 4a.
- the second piston 28 is mounted on the second eccentric portion 4b.
- a first vane groove 34 and a second vane groove 35 are formed in the first cylinder 5 and the second cylinder 15, respectively.
- a position of the first vane groove 34 matches with a position of the second vane groove 35 in a rotation direction of the shaft 4.
- the first eccentric portion 4a projects in a direction which is 180° opposite from a projecting direction of the second eccentric portion 4b. That is, a phase difference between the first piston 8 and the second piston 28 is 180°. This configuration exerts an effect for reducing vibration and noise.
- the upper bearing member 6 (first end plate member) is mounted on the first cylinder 5 such that a first cylinder chamber 25 is formed between an inner peripheral surface of the first cylinder 5 and an outer peripheral surface of the first piston 8.
- the lower bearing member 7 (second end plate member) is mounted on the second cylinder 15 such that a second cylinder chamber 26 is formed between an inner peripheral surface of the second cylinder 15 and an outer peripheral surface of the second piston 28. More specifically, the upper bearing member 6 is mounted on an upper portion of the first cylinder 5, and the lower bearing member 7 is mounted on a lower portion of the second cylinder 15.
- the middle plate 38 is placed between the first cylinder 5 and the second cylinder 15.
- the first suction port 19 and the second suction port 20 are formed in the first cylinder 5 and the second cylinder 15, respectively.
- the first suction port 19 and the second suction port 20 open toward the first cylinder chamber 25 and the second cylinder chamber 26, respectively.
- a first suction pipe 14 and a second suction pipe 16 are connected to the first suction port 19 and the second suction port 20, respectively.
- the first discharge port 40 and the second discharge port 41 are formed in the upper bearing member 6 and the lower bearing member 7, respectively.
- the first discharge port 40 and the second discharge port 41 open toward the first cylinder chamber 25 and the second cylinder chamber 26, respectively.
- the first discharge port 40 is provided with a first discharge valve 43 to open and close the first discharge port 40.
- the first discharge valve 43 is composed of a thin first valve 43a, a first valve stop 43b and a first fixing tool 43c.
- the first valve 43a adjusts a discharge amount of refrigerant.
- the first valve stop 43b restricts motion of the first valve 43a.
- the first fixing tool 43c fixes the first valve 43a and the first valve stop 43b.
- the second discharge port 41 is provided with a second discharge valve 44 to open and close the second discharge port 41.
- the second discharge valve 44 is composed of a thin second valve 44a, a second valve stop 44b and a second fixing tool 44c.
- the second valve 44a adjusts a discharge amount of refrigerant.
- the second valve stop 44b restricts motion of the second valve 44a.
- the second fixing tool 44c fixes the second valve 44a and the second valve stop 44b.
- the first vane 32 (blade) is placed in the first vane groove 34 such that the first vane 32 can slide therein.
- the first vane 32 partitions the first cylinder chamber 25 along a circumferential direction of the first piston 8. According to this, the first cylinder chamber 25 is partitioned into a first suction chamber 25a and a first discharge chamber 25b.
- the second vane 33 (blade) is placed in the second vane groove 35 such that the second vane 33 can slide therein.
- the second vane 33 partitions the second cylinder chamber 26 along a circumferential direction of the second piston 28. According to this, the second cylinder chamber 26 is partitioned into a second suction chamber 26a and a second discharge chamber 26b.
- the first suction port 19 and the first discharge port 40 are located on left and right sides of the first vane 32, respectively.
- the second suction port 20 and the second discharge port 41 are located on left and right sides of the second vane 33.
- Refrigerant to be compressed is supplied to the first cylinder chamber 25 (first suction chamber 25a) through the first suction port 19.
- Refrigerant to be compressed is supplied to the second cylinder chamber 26 (second suction chamber 26a) through the second suction port 20.
- Refrigerant compressed in the first cylinder chamber 25 pushes and opens the first discharge valve 43, and is discharged from the first discharge chamber 25b through the first discharge port 40.
- Refrigerant compressed in the second cylinder chamber 26 pushes and opens the second discharge valve 44, and is discharged from the second discharge chamber 26b through the second discharge port 41.
- the first piston 8 and the first vane 32 may be composed of a single part, i.e., a swing piston.
- the second piston 28 and the second vane 33 may be composed of a single part, i.e., a swing piston.
- the first vane 32 and the second vane 33 may be coupled to the first piston 8 and the second piston 28, respectively.
- the first spring 36 and the second spring 37 are placed behind the first vane 32 and the second vane 33, respectively.
- the first spring 36 and the second spring 37 respectively push the first vane 32 and the second vane 33 toward a center of the shaft 4.
- a rear portion of the first vane groove 34 and a rear portion of the second vane groove 35 are in communication with the interior space 13 of the hermetic container 1. Therefore, pressure in the interior space 13 of the hermetic container 1 is applied to a back surface of the first vane 32 and a back surface of the second vane 33.
- Lubricant oil stored in the oil reservoir 22 is supplied to the first vane groove 34 and the second vane groove 35.
- Refrigerant discharged from the first discharge chamber 25b through the first discharge port 40 can stay in a refrigerant discharge space 51.
- the first closing member 9 is mounted on the upper bearing member 6 (first end plate member) such that the refrigerant discharge space 51 is formed on the opposite side from the first cylinder chamber 25. More specifically, the first closing member 9 is mounted on an upper portion of the upper bearing member 6 such that the refrigerant discharge space 51 is formed above the upper bearing member 6.
- the first discharge valve 43 is covered with the first closing member 9.
- a discharge port 9a is formed in the first closing member 9 for guiding refrigerant from the refrigerant discharge space 51 into the interior space 13 of the hermetic container 1.
- Refrigerant discharged from the second discharge chamber 26b through the second discharge port 41 can stay in a refrigerant discharge space 52.
- the second closing member 10 is mounted on the lower bearing member 7 (second end plate member) such that the refrigerant discharge space 52 is formed on the opposite side from the second cylinder chamber 26. More specifically, the second closing member 10 is mounted on a lower portion of the lower bearing member 7 such that the refrigerant discharge space 52 is formed below the lower bearing member 7.
- the second discharge valve 44 is covered with the second closing member 10.
- the refrigerant discharge spaces 51 and 52 function as flow paths for refrigerant.
- the shaft 4 penetrates a central portion of the first closing member 9 and a central portion of the second closing member 10. The shaft 4 is supported by the upper bearing member 6 and the lower bearing member 7. According to this, the shaft 4 can rotate.
- the refrigerant discharge space 52 is composed of a possession space (space formed by minimum projection surface) when the second valve stop 44b, the penetrating flow path 46 and a passage 45 which brings the second discharge port 41 and the penetrating flow path 46 into communication with each other are projected in an axial direction of the shaft 4 as shown in Figs. 4 and 5 .
- the second valve stop 44b and the second valve 44a are fixed to each other through a rivet. They may be fixed to each other through a bolt instead of the rivet.
- the refrigerant discharge space 52 includes a space (escape portion) 47, and a device which fixes the second valve 44a and the second valve stop 44b to each other can be inserted into the space 47. According to this, since it becomes easy to fix the second valve stop 44b and the second valve 44a to each other through a rivet or a bolt, mass productivity is enhanced.
- an escape portion 47, the passage 45 and the penetrating flow path 46 may integrally formed together in the refrigerant discharge space 52. According to this, a flow of high pressure gas becomes excellent, and pressure loss is reduced.
- the refrigerant discharge space 52 is in communication with the refrigerant discharge space 51 through a penetrating flow path 46.
- the penetrating flow path 46 penetrates the lower bearing member 7, the second cylinder 15, the middle plate 38, the first cylinder 5 and the upper bearing member 6 in a direction parallel to a rotation axis of the shaft 4.
- Refrigerant compressed by the second compressing block 30 merges with refrigerant compressed by the first compressing block 3 in an interior space of the first closing member 9, i.e., in the refrigerant discharge space 51.
- a cross sectional area (area of flow path) of the penetrating flow path 46 is greater than a cross sectional area (area of flow path) of the second discharge port 41. According to this, it is possible to prevent pressure loss from increasing.
- a first reference plane H1, a second reference plane H2 and a third reference plane H3 are defined as follows.
- a plane which includes a center axis O 1 of the second cylinder 15 and a center of the second vane 33 when the second vane 33 most projects toward the center axis O 1 of the second cylinder 15 is defined as the first reference plane H1.
- the first reference plane H1 passes through a center of the second vane groove 35.
- a plane which includes the center axis O 1 and which is perpendicular to the first reference plane H1 is defined as the second reference plane H2.
- a plane which includes a center of the second suction port 20 and the center axis O 1 is defined as the third reference plane H3.
- the center axis O 1 of the second cylinder 15 substantially matches with the rotation axis of the shaft 4 and a center axis of the first cylinder 5.
- the compressing mechanism 102 further includes an oil retaining section 53.
- the oil retaining section 53 is formed on the same side as the second suction port 20 as viewed from the first reference plane H1 and on the opposite side from the second cylinder chamber 26 while sandwiching the lower bearing member 7 between the oil retaining section 53 and the second cylinder chamber 26. More specifically, the oil retaining section 53 is in contact with a lower surface of the lower bearing member 7.
- the oil retaining section 53 is configured such that oil stored in the oil reservoir 22 is taken into the oil retaining section 53 and a flow of the oil which is taken is suppressed more than a flow of oil in the oil reservoir 22.
- the flow of oil in the oil retaining section 53 is slower than the flow of oil in the oil reservoir 22.
- an oil surface in the oil reservoir 22 is located higher than a lower surface of the first cylinder 5.
- the oil surface in the oil reservoir 22 is higher than an upper surface of the first cylinder 5 and lower than a lower surface of the motor 2 during operation of the rotary compressor.
- the second cylinder 15, the lower bearing member 7 and the second closing member 10 are immersed in oil in the oil reservoir 22. Therefore, oil in the oil reservoir 22 can flow into the oil retaining section 53.
- Refrigerant to be compressed is in a low temperature and low pressure state.
- compressed refrigerant is in a high temperature and high pressure state.
- a specific temperature distribution is generated in the lower bearing member 7. More specifically, when the lower bearing member 7 is divided into a suction-side portion and a discharge-side portion, temperature of the suction-side portion is relatively low, and temperature of the discharge-side portion is relatively high.
- the lower bearing member 7 is divided into a suction-side portion and a discharge-side portion by the first reference plane H1.
- the suction-side portion includes a portion directly below the second suction port 20, and the second discharge port 41 is provided in the discharge-side portion.
- the oil retaining section 53 is formed on the same side as the second suction port 20 as viewed from the first reference plane H1.
- the oil retaining section 53 is in contact with a lower surface of the lower bearing member 7.
- oil retained by the oil retaining section 53 functions as heat insulating material, it is possible to restrain heat of refrigerant (compressed refrigerant) of the refrigerant discharge space 52 from moving toward refrigerant (sucked refrigerant) sucked into the second cylinder chamber 26 through the lower bearing member 7. Even if another member is placed between the oil retaining section 53 and the lower surface of the lower bearing member 7, this other member can be regarded as a portion of the lower bearing member 7.
- a first recess formed in the lower bearing member 7 is closed by the second closing member 10.
- the oil retaining section 53 is formed. According to this structure, since it is possible to avoid increase in the thickness of the lower bearing member 7, it is possible to avoid increase in cost of parts, and this is also an advantage in reduction in weight of the rotary compressor 200.
- the oil retaining section 53 may be formed by closing the first recess by a member which is different from the second closing member 10.
- the lower bearing member 7 is further provided with communication passages 7p.
- the communication passages 7p extend in a lateral direction to bring the oil reservoir 22 and the oil retaining section 53 into communication with each other. Oil in the oil reservoir 22 can flow into the oil retaining section 53 through the communication passages 7p (communication hole). If the plurality of communication passages 7p are formed, oil in the oil reservoir 22 can reliably flow into the oil retaining section 53. A size of each of the communication passages 7p is adjusted to such a necessary and sufficient size that oil in the oil reservoir 22 flows into the oil retaining section 53. Hence, a flow of oil in the oil retaining section 53 is slower than a flow of oil in the oil reservoir 22. Therefore, in the oil retaining section 53, oil forms relatively stable thermal stratification.
- the communication passages 7p are composed of small through holes.
- the communication passages 7p may be composed of other structures such as slits .
- upper ends of the communication passages 7p is located in a lower surface 7h of the lower bearing member 7, or exist at a location higher than the lower surface 7h of the lower bearing member 7. According to such a configuration, it is possible to prevent air or refrigerant from remaining in the oil retaining section 53.
- a second recess formed in the lower bearing member 7 is closed by the second closing member 10.
- the refrigerant discharge space 52 is formed. That is, the first recess which functions as the oil retaining section 53 and the second recess which functions as the refrigerant discharge space 52 are formed in the lower bearing member 7.
- the second closing member 10 is composed of a single plate-shaped member. An opening end surface of the first recess and an opening end surface of the second recess exist on the same plane so that both the first recess and the second recess are closed by the second closing member 10. Such a structure is extremely simple, and it is possible to avoid increase in the number of parts.
- the oil retaining section 53 is formed in a zone of a portion of a peripheral environment of the shaft 4, and the refrigerant discharge space 52 is formed in a zone of other portion of the peripheral environment of the shaft 4.
- the oil retaining section 53 is completely isolated from the refrigerant discharge space 52 by ribs 7k provided on the lower bearing member 7.
- Most of the refrigerant discharge space 52 is formed on the same side as the second discharge port 41 as viewed from the first reference plane H1.
- the oil retaining section 53 is formed on the same side of the second suction port 20 as viewed from the first reference plane H1. According to this positional relationship, it is possible to restrain heat of refrigerant discharged into the refrigerant discharge space 52 from moving toward refrigerant sucked into the second cylinder chamber 26.
- the first compressing block 3 may be omitted from a rotary compressor 200 shown in Fig. 8 . That is, this is a one-piston rotary compressor having only one cylinder.
- the present invention can be applied to the one-piston rotary compressor.
- the oil retaining section 53 may be formed in the upper bearing member 6 of the rotary compressor. According to the structure described with reference to Fig. 8 , it is also possible to form the oil retaining section 53 above the upper bearing member 6.
- the oil retaining section 53 may be formed on the upper side or on the lower side as viewed from the second cylinder chamber 26.
- the present invention is useful for a compressor of a refrigeration cycle device which can be utilized for an electric appliance such as a water heater, a hot-water heating device and an air conditioner.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Description
- The present invention relates to a rotary compressor used in an air conditioner, a freezing machine, a blower and a water heater.
- A rotary compressor is widely used in an electric appliance such as an air conditioner, a heating system and a water heater. As one of methods for enhancing efficiency of the rotary compressor, there is proposed a technique for suppressing deterioration of efficiency caused when refrigerant (sucked refrigerant) sucked into a compression chamber receives heat from environment, i.e., suppressing so-called heat loss.
- A rotary compressor of
patent document 1 has a hermetic space in a suction-side portion of a cylinder as means for suppressing heat-reception of sucked refrigerant. This hermetic space restrains heat from being transmitted from high temperature refrigerant in a hermetic container to an inner wall of the cylinder. - In a rotary compressor of patent document 2 a stagnation space defined by barriers is provided in a first muffler chamber communicating a first cylinder chamber. The stagnation space overlaps with a refrigerant-gas inlet side of the first cylinder chamber, the inlet side being bordered by a center plane, as viewed in a direction of a center axis of the first cylinder chamber. In the first muffler chamber, the high-temperature, high-pressure refrigerant gas is unlikely to enter into the stagnation space, so that heat is less absorbed to the inlet side of the first cylinder chamber.
- A compressor of
patent document 3 has a structure where cylinders and thin plate shaped port plates provided with delivering ports which deliver refrigerant compressed by the cylinders are provided between a first bearing member and a second bearing member arranged in a sealed case. On the first bearing member side, a four-side surrounded delivering space communicating with the delivering port which performs delivery in the sealed case is formed. -
- [PATENT DOCUMENT 1] Japanese Patent Application Laid-open No.
H2-140486 - [PATENT DOCUMENT 2]
European Patent Application 1 967 737 - [PATENT DOCUMENT 3] Japanese Patent Application Laid-open No.
H11-132177 - However, it is not always easy to form a hermetic space in a cylinder as in
patent document 1. Hence, another technique capable of effectively suppress the heat-reception of sucked refrigerant is desired. - Hence, it is an object of the present invention to provide a rotary compressor capable of further enhancing a heat-insulating effect by minimizing a range into which high temperature compressed refrigerant can enter.
- That is, the present invention provides a rotary compressor according to
claim 1. - According to the rotary compressor of the present invention, by minimizing a capacity of the refrigerant discharge space formed between the end plate member and the closing member, it is also possible to minimize the range of high temperature compressed refrigerant. According to this, since it is possible to restrain the temperature of the end plate member from rising, it is possible to restrain heat of the compressed refrigerant from moving toward the sucked refrigerant through the end plate member and thus, volume efficiency is enhanced.
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Fig. 1 is a vertical sectional view of a rotary compressor according to an example not falling under the scope of the claims; -
Fig. 2 is a transverse sectional view of the rotary compressor shown inFig. 1 taken along line IIA-IIA; -
Fig. 3 is a transverse sectional view of the rotary compressor shown inFig. 1 taken along line IIB-IIB; -
Fig. 4 is a bottom view of a lower bearing member having a refrigerant discharge space formed by a minimum projection plane of valve stop, a penetrating flow path and a passage of the rotary compressor; -
Fig. 5 is a bottom view of the lower bearing member in a state where the valve and the valve stop of the rotary compressor are fixed; -
Fig. 6 is a bottom view of the lower bearing member including a space (escape portion) into which a device fixing the valve and the valve stop of the rotary compressor is inserted; -
Fig. 7 is a bottom view of the lower bearing member which secures a capacity of 3 cc or more around the discharge port of the rotary compressor. -
Fig. 8 is a vertical sectional view of a rotary compressor according to an embodiment of the present invention; -
Fig. 9 is a bottom view of a lower bearing member on which an escape portion, a passage and a penetrating flow path of the rotary compressor are integrally formed; and -
Fig. 10 is a vertical sectional view of an oil retaining section of the rotary compressor. -
- 1
- hermetic container
- 2
- motor
- 3
- first compressing block
- 4
- shaft
- 4a
- first eccentric portion
- 4b
- second eccentric portion
- 5
- first cylinder
- 6
- upper bearing member
- 7
- lower bearing member
- 7p
- communication passage
- 8
- first piston
- 9
- first closing member
- 10
- second closing member
- 11
- discharge pipe
- 13
- interior space
- 14
- first suction pipe
- 15
- second cylinder
- 16
- second suction pipe
- 17
- stator
- 18
- rotor
- 19
- first suction port
- 20
- second suction port
- 21
- terminal
- 22
- oil reservoir
- 25
- first cylinder chamber
- 25a
- first suction chamber
- 25b
- first discharge chamber
- 26
- second cylinder chamber
- 26a
- second suction chamber
- 26b
- second discharge chamber
- 28
- second piston
- 30
- second compressing block
- 32
- first vane
- 33
- second vane
- 34
- first vane groove
- 35
- second vane groove
- 36
- first spring
- 37
- second spring
- 38
- middle plate
- 40
- first discharge port
- 41
- second discharge port
- 43
- first discharge valve
- 43a
- first valve
- 43b
- first valve stop
- 43c
- first fixing tool
- 44
- second discharge valve
- 44a
- second valve
- 44b
- second valve stop
- 44c
- second fixing tool
- 45
- passage
- 46
- penetrating flow path
- 51, 52
- refrigerant discharge space
- 53
- oil retaining section
- 100
- rotary compressor
- 102
- compressing mechanism
- 200
- rotary compressor
- A first exemplary compressor comprises: a hermetic container having an oil reservoir; a cylinder placed in the hermetic container; a piston placed in the cylinder; an end plate member mounted on the cylinder to form a cylinder chamber between the cylinder and the piston; a vane which partitions the cylinder chamber into a suction chamber and a discharge chamber; a suction port for supplying refrigerant to be compressed into the suction chamber; a discharge port which is formed in the end plate member and which discharges the compressed refrigerant from the discharge chamber; a valve provided in the discharge port for adjusting a discharge amount of the refrigerant; a valve stop for restricting motion of the valve; a refrigerant discharge space which is provided in the end plate member that closes the cylinder and in which the refrigerant discharged from the discharge chamber through the discharge port can stay; a closing member mounted on the end plate member; and one or more penetrating flow paths for discharging the refrigerant from the refrigerant discharge space into the hermetic container, wherein the refrigerant discharge space is a space formed by substantially a minimum projection surface of the valve stop, the penetrating flow path and a passage which brings the discharge port and the penetrating flow path into communication with each other. According to this, since it is possible to minimize an area of the refrigerant discharge space where high temperature compressed gas exists, it is possible to restrain heat from moving toward the lower bearing member, a heating amount toward the sucked refrigerant is reduced, and volume efficiency is enhanced.
- Another examplary rotary compressor may comprise: a hermetic container having an oil reservoir; a shaft placed in the hermetic container; a cylinder placed in the hermetic container; a piston placed in the cylinder and connected to the shaft; an end plate member mounted on the cylinder to form a cylinder chamber between the cylinder and the piston; a vane which partitions the cylinder chamber into a suction chamber and a discharge chamber; a suction port for supplying refrigerant to be compressed into the suction chamber; a discharge port which is formed in the end plate member and which discharges the compressed refrigerant from the discharge chamber; a valve provided in the discharge port for adjusting a discharge amount of the refrigerant; a valve stop for restricting motion of the valve; a refrigerant discharge space which is provided in the end plate member that closes the cylinder and in which the refrigerant discharged from the discharge chamber through the discharge port can stay; a closing member mounted on the end plate member; and a penetrating flow path for discharging the refrigerant from the refrigerant discharge space into the hermetic container, wherein the refrigerant discharge space is composed of a possession space when the valve stop, the penetrating flow path and a passage which brings the discharge port and the penetrating flow path into communication with each other are projected in an axial direction of the shaft. According to this example, since it is possible to minimize an area of the refrigerant discharge space where high temperature compressed gas exists, it is possible to restrain heat from moving toward the lower bearing member, a heating amount toward the sucked refrigerant is reduced, and volume efficiency is enhanced.
- In the first exemplary compressor, the refrigerant discharge space includes a space into which a device for fixing the valve stop can be inserted. According to this aspect, since it becomes easy to fix the valve stop and the valve by means of a rivet or a bolt, mass productivity is enhanced.
- In a further exemplary rotary compressor, the end plate member includes an oil retaining section for taking in a portion of oil stored in the oil reservoir. According to this example, since oil retained in the oil retaining section functions as heat insulating material, it is possible to restrain heat of refrigerant (compressed refrigerant) in the refrigerant discharge space from moving toward refrigerant (sucked refrigerant) sucked into the cylinder chamber through the lower bearing member, volume efficiency is enhanced.
- In the first exemplary compressor, the oil retaining section is configured such that a flow of the oil which is taken in is suppressed more than the oil reservoir. According to this aspect, since heat insulating properties of oil retained in the oil retaining section is enhanced, the volume efficiency is further enhanced.
- In the first exemplary compressor, a muffler space is provided between the penetrating flow path and an interior of the hermetic container. According to this aspect, refrigerant compressed by the second compressing block merges with refrigerant compressed by the first compressing block in the interior space of the first closing member, i.e., in the refrigerant discharge space (muffler space) on the side of an upper bearing member. Hence, even if the refrigerant discharge space on the side of a lower bearing member is slightly insufficient, a sound deadening effect can be obtained by the refrigerant discharge space (muffler space) on the side of the upper bearing member in the first closing member.
- Embodiments of the present invention will be described below with reference to the drawings. The invention is not limited to the embodiment.
- As shown in
Fig. 1 , arotary compressor 100 of an example not falling under the scope of the claims includes ahermetic container 1, amotor 2, acompressing mechanism 102 and ashaft 4. Thecompressing mechanism 102 is placed at a lower location in thehermetic container 1. Themotor 2 is placed in thehermetic container 1 at a location above thecompressing mechanism 102. Thecompressing mechanism 102 and themotor 2 are connected to each other through theshaft 4. A terminal 21 for supplying electricity to themotor 2 is provided on an upper portion of thehermetic container 1 2. Anoil reservoir 22 for retaining lubricant oil is formed in a bottom of thehermetic container 1. - The
motor 2 is composed of astator 17 and arotor 18. Thestator 17 is fixed to an inner wall of thehermetic container 1. Therotor 18 is fixed to theshaft 4. Therotor 18 and theshaft 4 are driven and rotated by themotor 2. The upper portion of thehermetic container 1 is provided with adischarge pipe 11. Thedischarge pipe 11 penetrates the upper portion of thehermetic container 1 and opens toward aninterior space 13 of thehermetic container 1. Thedischarge pipe 11 functions as a discharge flow path through which refrigerant compressed by thecompressing mechanism 102 is introduced to outside of thehermetic container 1. When therotary compressor 100 operates, theinterior space 13 of thehermetic container 1 is filled with compressed refrigerant. That is, therotary compressor 100 is a high pressure shell-type compressor. According to the high pressure shell-type rotary compressor 100, since it is possible to cool themotor 2 by refrigerant, it is possible to expect that motor efficiency is enhanced. - The
compressing mechanism 102 is operated by themotor 2 to compress refrigerant. More specifically, thecompressing mechanism 102 includes afirst compressing block 3, asecond compressing block 30, anupper bearing member 6, alower bearing member 7, amiddle plate 38, a first closing member 9 (first muffler member) and a second closing member 10 (second muffler member). Refrigerant is compressed by thefirst compressing block 3 or thesecond compressing block 30. Thefirst compressing block 3 and thesecond compressing block 30 are immersed in oil stored in theoil reservoir 22. In this embodiment, thefirst compressing block 3 is composed of parts which are in common with parts configuring thesecond compressing block 30. Therefore, thefirst compressing block 3 has the same suction capacity as that of thesecond compressing block 30. - As shown in
Fig. 2 , thefirst compressing block 3 is composed of afirst cylinder 5, afirst piston 8, afirst vane 32, afirst suction port 19, afirst discharge port 40 and afirst spring 36. As shown inFig. 3 , thesecond compressing block 30 is composed of asecond cylinder 15, asecond piston 28, asecond vane 33, asecond suction port 20, asecond discharge port 41 and asecond spring 37. Thefirst cylinder 5 and thesecond cylinder 15 are concentrically placed. - The
shaft 4 includes a firsteccentric portion 4a and a secondeccentric portion 4b. The firsteccentric portion 4a and the secondeccentric portion 4b project outward in a radial direction of theshaft 4. Thefirst piston 8 and thesecond piston 28 are placed in thefirst cylinder 5 and thesecond cylinder 15, respectively. In thefirst cylinder 5, thefirst piston 8 is mounted on the firsteccentric portion 4a. In thesecond cylinder 15, thesecond piston 28 is mounted on the secondeccentric portion 4b. Afirst vane groove 34 and asecond vane groove 35 are formed in thefirst cylinder 5 and thesecond cylinder 15, respectively. A position of thefirst vane groove 34 matches with a position of thesecond vane groove 35 in a rotation direction of theshaft 4. The firsteccentric portion 4a projects in a direction which is 180° opposite from a projecting direction of the secondeccentric portion 4b. That is, a phase difference between thefirst piston 8 and thesecond piston 28 is 180°. This configuration exerts an effect for reducing vibration and noise. - The upper bearing member 6 (first end plate member) is mounted on the
first cylinder 5 such that afirst cylinder chamber 25 is formed between an inner peripheral surface of thefirst cylinder 5 and an outer peripheral surface of thefirst piston 8. The lower bearing member 7 (second end plate member) is mounted on thesecond cylinder 15 such that asecond cylinder chamber 26 is formed between an inner peripheral surface of thesecond cylinder 15 and an outer peripheral surface of thesecond piston 28. More specifically, theupper bearing member 6 is mounted on an upper portion of thefirst cylinder 5, and thelower bearing member 7 is mounted on a lower portion of thesecond cylinder 15. Themiddle plate 38 is placed between thefirst cylinder 5 and thesecond cylinder 15. - The
first suction port 19 and thesecond suction port 20 are formed in thefirst cylinder 5 and thesecond cylinder 15, respectively. Thefirst suction port 19 and thesecond suction port 20 open toward thefirst cylinder chamber 25 and thesecond cylinder chamber 26, respectively. Afirst suction pipe 14 and asecond suction pipe 16 are connected to thefirst suction port 19 and thesecond suction port 20, respectively. - The
first discharge port 40 and thesecond discharge port 41 are formed in theupper bearing member 6 and thelower bearing member 7, respectively. Thefirst discharge port 40 and thesecond discharge port 41 open toward thefirst cylinder chamber 25 and thesecond cylinder chamber 26, respectively. Thefirst discharge port 40 is provided with afirst discharge valve 43 to open and close thefirst discharge port 40. Thefirst discharge valve 43 is composed of a thinfirst valve 43a, afirst valve stop 43b and afirst fixing tool 43c. Thefirst valve 43a adjusts a discharge amount of refrigerant. Thefirst valve stop 43b restricts motion of thefirst valve 43a. Thefirst fixing tool 43c fixes thefirst valve 43a and thefirst valve stop 43b. - The
second discharge port 41 is provided with asecond discharge valve 44 to open and close thesecond discharge port 41. Thesecond discharge valve 44 is composed of a thin second valve 44a, asecond valve stop 44b and a second fixing tool 44c. The second valve 44a adjusts a discharge amount of refrigerant. Thesecond valve stop 44b restricts motion of the second valve 44a. The second fixing tool 44c fixes the second valve 44a and thesecond valve stop 44b. - The first vane 32 (blade) is placed in the
first vane groove 34 such that thefirst vane 32 can slide therein. Thefirst vane 32 partitions thefirst cylinder chamber 25 along a circumferential direction of thefirst piston 8. According to this, thefirst cylinder chamber 25 is partitioned into afirst suction chamber 25a and afirst discharge chamber 25b. The second vane 33 (blade) is placed in thesecond vane groove 35 such that thesecond vane 33 can slide therein. Thesecond vane 33 partitions thesecond cylinder chamber 26 along a circumferential direction of thesecond piston 28. According to this, thesecond cylinder chamber 26 is partitioned into asecond suction chamber 26a and asecond discharge chamber 26b. Thefirst suction port 19 and thefirst discharge port 40 are located on left and right sides of thefirst vane 32, respectively. Thesecond suction port 20 and thesecond discharge port 41 are located on left and right sides of thesecond vane 33. Refrigerant to be compressed is supplied to the first cylinder chamber 25 (first suction chamber 25a) through thefirst suction port 19. Refrigerant to be compressed is supplied to the second cylinder chamber 26 (second suction chamber 26a) through thesecond suction port 20. Refrigerant compressed in thefirst cylinder chamber 25 pushes and opens thefirst discharge valve 43, and is discharged from thefirst discharge chamber 25b through thefirst discharge port 40. Refrigerant compressed in thesecond cylinder chamber 26 pushes and opens thesecond discharge valve 44, and is discharged from thesecond discharge chamber 26b through thesecond discharge port 41. - The
first piston 8 and thefirst vane 32 may be composed of a single part, i.e., a swing piston. Thesecond piston 28 and thesecond vane 33 may be composed of a single part, i.e., a swing piston. Thefirst vane 32 and thesecond vane 33 may be coupled to thefirst piston 8 and thesecond piston 28, respectively. - The
first spring 36 and thesecond spring 37 are placed behind thefirst vane 32 and thesecond vane 33, respectively. Thefirst spring 36 and thesecond spring 37 respectively push thefirst vane 32 and thesecond vane 33 toward a center of theshaft 4. A rear portion of thefirst vane groove 34 and a rear portion of thesecond vane groove 35 are in communication with theinterior space 13 of thehermetic container 1. Therefore, pressure in theinterior space 13 of thehermetic container 1 is applied to a back surface of thefirst vane 32 and a back surface of thesecond vane 33. Lubricant oil stored in theoil reservoir 22 is supplied to thefirst vane groove 34 and thesecond vane groove 35. - Refrigerant discharged from the
first discharge chamber 25b through thefirst discharge port 40 can stay in arefrigerant discharge space 51. As shown inFig. 1 , thefirst closing member 9 is mounted on the upper bearing member 6 (first end plate member) such that therefrigerant discharge space 51 is formed on the opposite side from thefirst cylinder chamber 25. More specifically, thefirst closing member 9 is mounted on an upper portion of theupper bearing member 6 such that therefrigerant discharge space 51 is formed above theupper bearing member 6. Thefirst discharge valve 43 is covered with thefirst closing member 9. Adischarge port 9a is formed in thefirst closing member 9 for guiding refrigerant from therefrigerant discharge space 51 into theinterior space 13 of thehermetic container 1. Refrigerant discharged from thesecond discharge chamber 26b through thesecond discharge port 41 can stay in arefrigerant discharge space 52. Thesecond closing member 10 is mounted on the lower bearing member 7 (second end plate member) such that therefrigerant discharge space 52 is formed on the opposite side from thesecond cylinder chamber 26. More specifically, thesecond closing member 10 is mounted on a lower portion of thelower bearing member 7 such that therefrigerant discharge space 52 is formed below thelower bearing member 7. Thesecond discharge valve 44 is covered with thesecond closing member 10. Therefrigerant discharge spaces shaft 4 penetrates a central portion of thefirst closing member 9 and a central portion of thesecond closing member 10. Theshaft 4 is supported by theupper bearing member 6 and thelower bearing member 7. According to this, theshaft 4 can rotate. - In the rotary compressor configured as described above, the
refrigerant discharge space 52 is composed of a possession space (space formed by minimum projection surface) when thesecond valve stop 44b, the penetratingflow path 46 and apassage 45 which brings thesecond discharge port 41 and the penetratingflow path 46 into communication with each other are projected in an axial direction of theshaft 4 as shown inFigs. 4 and5 . - The
second valve stop 44b and the second valve 44a are fixed to each other through a rivet. They may be fixed to each other through a bolt instead of the rivet. - According to this, since an area of the
refrigerant discharge space 52 where high temperature compressed gas exists can be minimized, heat is restrained from moving toward the lower bearing member and thus, a heating amount toward the suction is reduced and volume efficiency is enhanced. - As shown in
Fig. 6 , therefrigerant discharge space 52 includes a space (escape portion) 47, and a device which fixes the second valve 44a and thesecond valve stop 44b to each other can be inserted into thespace 47. According to this, since it becomes easy to fix thesecond valve stop 44b and the second valve 44a to each other through a rivet or a bolt, mass productivity is enhanced. - As shown in
Fig. 7 , anescape portion 47, thepassage 45 and the penetratingflow path 46 may integrally formed together in therefrigerant discharge space 52. According to this, a flow of high pressure gas becomes excellent, and pressure loss is reduced. - As shown in
Fig. 1 , therefrigerant discharge space 52 is in communication with therefrigerant discharge space 51 through a penetratingflow path 46. The penetratingflow path 46 penetrates thelower bearing member 7, thesecond cylinder 15, themiddle plate 38, thefirst cylinder 5 and theupper bearing member 6 in a direction parallel to a rotation axis of theshaft 4. Refrigerant compressed by thesecond compressing block 30 merges with refrigerant compressed by thefirst compressing block 3 in an interior space of thefirst closing member 9, i.e., in therefrigerant discharge space 51. Hence, even if a volume of therefrigerant discharge space 52 is slightly insufficient, a sound deadening effect can be obtained by therefrigerant discharge space 51 in thefirst closing member 9. A cross sectional area (area of flow path) of the penetratingflow path 46 is greater than a cross sectional area (area of flow path) of thesecond discharge port 41. According to this, it is possible to prevent pressure loss from increasing. - As shown
Fig. 3 , in the present example not falling under the scope of the claims, a first reference plane H1, a second reference plane H2 and a third reference plane H3 are defined as follows. A plane which includes a center axis O1 of thesecond cylinder 15 and a center of thesecond vane 33 when thesecond vane 33 most projects toward the center axis O1 of thesecond cylinder 15 is defined as the first reference plane H1. The first reference plane H1 passes through a center of thesecond vane groove 35. A plane which includes the center axis O1 and which is perpendicular to the first reference plane H1 is defined as the second reference plane H2. A plane which includes a center of thesecond suction port 20 and the center axis O1 is defined as the third reference plane H3. The center axis O1 of thesecond cylinder 15 substantially matches with the rotation axis of theshaft 4 and a center axis of thefirst cylinder 5. - Next, the
oil retaining section 53 will be described. - As shown in
Fig. 8 , according to the invention, thecompressing mechanism 102 further includes anoil retaining section 53. Theoil retaining section 53 is formed on the same side as thesecond suction port 20 as viewed from the first reference plane H1 and on the opposite side from thesecond cylinder chamber 26 while sandwiching thelower bearing member 7 between theoil retaining section 53 and thesecond cylinder chamber 26. More specifically, theoil retaining section 53 is in contact with a lower surface of thelower bearing member 7. Theoil retaining section 53 is configured such that oil stored in theoil reservoir 22 is taken into theoil retaining section 53 and a flow of the oil which is taken is suppressed more than a flow of oil in theoil reservoir 22. The flow of oil in theoil retaining section 53 is slower than the flow of oil in theoil reservoir 22. - In the
rotary compressor 200, an oil surface in theoil reservoir 22 is located higher than a lower surface of thefirst cylinder 5. To secure reliability, it is preferable that the oil surface in theoil reservoir 22 is higher than an upper surface of thefirst cylinder 5 and lower than a lower surface of themotor 2 during operation of the rotary compressor. Thesecond cylinder 15, thelower bearing member 7 and thesecond closing member 10 are immersed in oil in theoil reservoir 22. Therefore, oil in theoil reservoir 22 can flow into theoil retaining section 53. - Refrigerant to be compressed is in a low temperature and low pressure state. On the other hand, compressed refrigerant is in a high temperature and high pressure state. Hence, during operation of the
rotary compressor 100, a specific temperature distribution is generated in thelower bearing member 7. More specifically, when thelower bearing member 7 is divided into a suction-side portion and a discharge-side portion, temperature of the suction-side portion is relatively low, and temperature of the discharge-side portion is relatively high. Thelower bearing member 7 is divided into a suction-side portion and a discharge-side portion by the first reference plane H1. The suction-side portion includes a portion directly below thesecond suction port 20, and thesecond discharge port 41 is provided in the discharge-side portion. - In this embodiment, the
oil retaining section 53 is formed on the same side as thesecond suction port 20 as viewed from the first reference plane H1. Theoil retaining section 53 is in contact with a lower surface of thelower bearing member 7. In this case, since oil retained by theoil retaining section 53 functions as heat insulating material, it is possible to restrain heat of refrigerant (compressed refrigerant) of therefrigerant discharge space 52 from moving toward refrigerant (sucked refrigerant) sucked into thesecond cylinder chamber 26 through thelower bearing member 7. Even if another member is placed between theoil retaining section 53 and the lower surface of thelower bearing member 7, this other member can be regarded as a portion of thelower bearing member 7. - As shown in
Figs. 8 and9 , in this embodiment, a first recess formed in thelower bearing member 7 is closed by thesecond closing member 10. According to this, theoil retaining section 53 is formed. According to this structure, since it is possible to avoid increase in the thickness of thelower bearing member 7, it is possible to avoid increase in cost of parts, and this is also an advantage in reduction in weight of therotary compressor 200. Alternatively, theoil retaining section 53 may be formed by closing the first recess by a member which is different from thesecond closing member 10. - The
lower bearing member 7 is further provided withcommunication passages 7p. Thecommunication passages 7p extend in a lateral direction to bring theoil reservoir 22 and theoil retaining section 53 into communication with each other. Oil in theoil reservoir 22 can flow into theoil retaining section 53 through thecommunication passages 7p (communication hole). If the plurality ofcommunication passages 7p are formed, oil in theoil reservoir 22 can reliably flow into theoil retaining section 53. A size of each of thecommunication passages 7p is adjusted to such a necessary and sufficient size that oil in theoil reservoir 22 flows into theoil retaining section 53. Hence, a flow of oil in theoil retaining section 53 is slower than a flow of oil in theoil reservoir 22. Therefore, in theoil retaining section 53, oil forms relatively stable thermal stratification. - In this embodiment, the
communication passages 7p are composed of small through holes. Thecommunication passages 7p may be composed of other structures such as slits . As shown inFigs. 9 and10 , in a direction parallel to the rotation axis of theshaft 4, upper ends of thecommunication passages 7p is located in alower surface 7h of thelower bearing member 7, or exist at a location higher than thelower surface 7h of thelower bearing member 7. According to such a configuration, it is possible to prevent air or refrigerant from remaining in theoil retaining section 53. - A second recess formed in the
lower bearing member 7 is closed by thesecond closing member 10. According to this, therefrigerant discharge space 52 is formed. That is, the first recess which functions as theoil retaining section 53 and the second recess which functions as therefrigerant discharge space 52 are formed in thelower bearing member 7. Thesecond closing member 10 is composed of a single plate-shaped member. An opening end surface of the first recess and an opening end surface of the second recess exist on the same plane so that both the first recess and the second recess are closed by thesecond closing member 10. Such a structure is extremely simple, and it is possible to avoid increase in the number of parts. - As shown in
Fig. 9 , theoil retaining section 53 is formed in a zone of a portion of a peripheral environment of theshaft 4, and therefrigerant discharge space 52 is formed in a zone of other portion of the peripheral environment of theshaft 4. Theoil retaining section 53 is completely isolated from therefrigerant discharge space 52 by ribs 7k provided on thelower bearing member 7. Most of therefrigerant discharge space 52 is formed on the same side as thesecond discharge port 41 as viewed from the first reference plane H1. On the other hand, theoil retaining section 53 is formed on the same side of thesecond suction port 20 as viewed from the first reference plane H1. According to this positional relationship, it is possible to restrain heat of refrigerant discharged into therefrigerant discharge space 52 from moving toward refrigerant sucked into thesecond cylinder chamber 26. - Although it is not illustrated in the drawings, the
first compressing block 3 may be omitted from arotary compressor 200 shown inFig. 8 . That is, this is a one-piston rotary compressor having only one cylinder. The present invention can be applied to the one-piston rotary compressor. - Further, although it is not likewise illustrated in the drawings, the
oil retaining section 53 may be formed in theupper bearing member 6 of the rotary compressor. According to the structure described with reference toFig. 8 , it is also possible to form theoil retaining section 53 above theupper bearing member 6. Theoil retaining section 53 may be formed on the upper side or on the lower side as viewed from thesecond cylinder chamber 26. - The present invention is useful for a compressor of a refrigeration cycle device which can be utilized for an electric appliance such as a water heater, a hot-water heating device and an air conditioner.
Claims (4)
- A rotary compressor (200) comprising:a hermetic container (1) having an oil reservoir (22);a cylinder (15) placed in the hermetic container (1);a piston (28) placed in the cylinder (15);an end plate member (7) mounted on the cylinder (15) to form a cylinder chamber (26) between the cylinder (15) and the piston (28);a vane (33) which partitions the cylinder chamber (26) into a suction chamber (26a) and a discharge chamber (26b);a suction port (20) for supplying refrigerant to be compressed into the suction chamber (26a);a discharge port (41) which is formed in the end plate member (7) and which discharges the compressed refrigerant from the discharge chamber (26b);a valve (44a) provided in the discharge port (41) for adjusting a discharge amount of the refrigerant;a valve stop (44b) for restricting motion of the valve (44a);a refrigerant discharge space (52) which is provided in the end plate member (7) that closes the cylinder (15) and in which the refrigerant discharged from the discharge chamber (26b) through the discharge port (41) can stay; andone or more penetrating flow paths (46) for discharging the refrigerant from the refrigerant discharge space (52) into the hermetic container (1),wherein the refrigerant discharge space (52) is a space formed by substantially a minimum projection surface of the valve stop (44b), the penetrating flow path (46) and a passage (45) which brings the discharge port (41) and the penetrating flow path (46) into communication with each other,wherein a plane which includes a center of the second suction port (20) and a center axis (O1) is defined as a third reference plane (H3),the refrigerant discharge space (52) is formed in the end plate member (7) on the side of the third reference plane (H3) on which the vane (33) is disposed, andan interior angle formed by a first phantom line connected with an end of the refrigerant discharge space (52) and the center axis (O1) of the cylinder (15), and a second phantom line connected with another end of the refrigerant discharge space (52) and the center axis (O1) of the cylinder (15) is within the range of 180° relative to the center axis (O1) of the cylinder (15),characterised in that a closing member (10) is mounted on the end plate member (7), and in that a first recess which functions as the oil retaining section (53) and a second recess which functions as the refrigerant discharge space (52) are formed in the end plate member (7),and in that the first recess and the second recess are closed by the closing member (10),and in that communication passages (7p) are provided to bring the oil reservoir (22) and the oil retaining section (53) into communication with each other, and in thata portion of oil stored in the oil reservoir (22) is taken into the oil retaining section (53) from the communication passages (7p).
- The rotary compressor (200) according to claim 1, wherein the refrigerant discharge space (52) includes a space (47) into which a device for fixing the valve stop (44b) can be inserted.
- The rotary compressor (200) according to claim 1, wherein the oil retaining section (53) is configured such that a flow of the oil which is taken in is suppressed more than in the oil reservoir (22).
- The rotary compressor (200) according to any one of claims 1 to 3, wherein a muffler space (51) is provided between the penetrating flow path (46) and an interior of the hermetic container (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012142634 | 2012-06-26 | ||
PCT/JP2013/003893 WO2014002457A1 (en) | 2012-06-26 | 2013-06-21 | Rotary compressor |
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EP2873864A1 EP2873864A1 (en) | 2015-05-20 |
EP2873864A4 EP2873864A4 (en) | 2015-10-21 |
EP2873864B1 true EP2873864B1 (en) | 2020-09-09 |
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EP13810070.6A Active EP2873864B1 (en) | 2012-06-26 | 2013-06-21 | Rotary compressor |
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EP (1) | EP2873864B1 (en) |
JP (1) | JP6206776B2 (en) |
CN (1) | CN104428536B (en) |
WO (1) | WO2014002457A1 (en) |
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WO2016098710A1 (en) * | 2014-12-19 | 2016-06-23 | 株式会社富士通ゼネラル | Rotary compressor |
JP6128194B2 (en) * | 2015-10-30 | 2017-05-17 | 株式会社富士通ゼネラル | Rotary compressor |
JP6112104B2 (en) * | 2014-12-19 | 2017-04-12 | 株式会社富士通ゼネラル | Rotary compressor |
AU2015364875B2 (en) | 2014-12-19 | 2018-09-27 | Fujitsu General Limited | Rotary compressor |
JP7044463B2 (en) | 2016-11-14 | 2022-03-30 | 株式会社富士通ゼネラル | Rotary compressor |
CN114046250B (en) * | 2021-11-03 | 2022-09-16 | 珠海格力电器股份有限公司 | Resonant cavity assembly and compressor |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11132177A (en) * | 1997-10-30 | 1999-05-18 | Toshiba Corp | Rotary compressor |
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JPH02140486A (en) | 1988-11-22 | 1990-05-30 | Mitsubishi Electric Corp | Rotary compressor |
TWI301188B (en) * | 2002-08-30 | 2008-09-21 | Sanyo Electric Co | Refrigeant cycling device and compressor using the same |
JP4007383B2 (en) * | 2005-12-27 | 2007-11-14 | ダイキン工業株式会社 | Rotary compressor |
KR100802023B1 (en) * | 2006-11-01 | 2008-02-12 | 삼성전자주식회사 | Rotary compressor |
JP4900081B2 (en) * | 2007-06-25 | 2012-03-21 | ダイキン工業株式会社 | Rotary compressor |
JP4948557B2 (en) * | 2009-03-12 | 2012-06-06 | 三菱電機株式会社 | Multistage compressor and refrigeration air conditioner |
-
2013
- 2013-06-21 WO PCT/JP2013/003893 patent/WO2014002457A1/en active Application Filing
- 2013-06-21 EP EP13810070.6A patent/EP2873864B1/en active Active
- 2013-06-21 CN CN201380034274.6A patent/CN104428536B/en active Active
- 2013-06-21 JP JP2014522422A patent/JP6206776B2/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH11132177A (en) * | 1997-10-30 | 1999-05-18 | Toshiba Corp | Rotary compressor |
Also Published As
Publication number | Publication date |
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JP6206776B2 (en) | 2017-10-04 |
JPWO2014002457A1 (en) | 2016-05-30 |
CN104428536A (en) | 2015-03-18 |
CN104428536B (en) | 2017-05-10 |
EP2873864A1 (en) | 2015-05-20 |
WO2014002457A1 (en) | 2014-01-03 |
EP2873864A4 (en) | 2015-10-21 |
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