WO2014064919A1 - ロータリ圧縮機 - Google Patents
ロータリ圧縮機 Download PDFInfo
- Publication number
- WO2014064919A1 WO2014064919A1 PCT/JP2013/006229 JP2013006229W WO2014064919A1 WO 2014064919 A1 WO2014064919 A1 WO 2014064919A1 JP 2013006229 W JP2013006229 W JP 2013006229W WO 2014064919 A1 WO2014064919 A1 WO 2014064919A1
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- WIPO (PCT)
- Prior art keywords
- bearing
- oil groove
- shaft
- oil
- rotary compressor
- Prior art date
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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
- F04C29/02—Lubrication; Lubricant separation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
-
- 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
- F04C18/32—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 both the movement defined in group F04C18/02 and relative reciprocation between the co-operating members
- F04C18/322—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 both the movement defined in group F04C18/02 and relative reciprocation between the co-operating members with vanes hinged to the outer member and reciprocating with respect to the outer member
-
- 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
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/001—Radial sealings for working fluid
-
- 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
-
- 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
- F04C29/02—Lubrication; Lubricant separation
- F04C29/028—Means for improving or restricting lubricant flow
-
- 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
- F04C2210/00—Fluid
- F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
- F04C2210/268—R32
-
- 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
- F04C2240/00—Components
- F04C2240/50—Bearings
-
- 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
Definitions
- the present invention relates to a rotary compressor using a refrigerant containing R32.
- HCFC-based refrigerants have conventionally been used as refrigerants in heat pump type refrigeration systems widely used in electric appliances such as air conditioners, heating devices and water heaters.
- R32 refrigerant is mentioned as a next candidate among HFC refrigerants with the aim of such improvement, and a compressor using the R32 refrigerant has been proposed (for example, see Patent Document 1).
- the R32 refrigerant has a lower GWP than the R410A refrigerant, and the COP (coefficient of performance) is also comparable to that of the conventional refrigerant.
- R32 refrigerant has a low GWP value, but has a boiling point lower than that of the currently used R410A refrigerant. For this reason, a decrease in oil solubility with respect to the refrigerant occurs. If the solubility decreases, there is a possibility that the refrigerant separated from the oil may be supplied to the compressor sliding portion during the operation of the compressor. There is a risk of lowering it.
- FIG. 6 shows the entire cross section of a conventional rotary compressor disclosed in Patent Document 1
- FIG. 7 shows the cross section of the compression element of the conventional rotary compressor.
- the sealed container 101 accommodates an electric element 104 including a stator 102 and a rotor 103 and a compression element 105 driven by the electric element 104.
- the oil 106 is collected at the bottom of the closed container 101.
- the shaft 107 has an eccentric 108.
- the cylinder 109 forms a compression chamber concentric with the rotation center of the shaft 107.
- the main bearing portion 110 and the sub bearing portion 111 airtightly close both sides of the cylinder 109.
- the piston 112 is attached to the eccentric portion 108 and rolls along the inner wall of the compression chamber.
- the compression chamber is divided into a high pressure chamber and a low pressure chamber by vanes (not shown) reciprocating on and in contact with the piston 112.
- One end of the suction pipe 113 is press-fitted into the cylinder 109 and opens to the low pressure chamber of the compression chamber, and the other end of the suction pipe 113 is connected to the low pressure side of a system (not shown) outside the sealed container 101 .
- the main bearing portion 110 is provided with a discharge valve (not shown).
- a discharge muffler 114 having an opening is fitted in the main bearing portion 110.
- One end of the discharge pipe 115 opens into the space in the sealed container 101, and the other end of the discharge pipe 115 is connected to the high pressure side of a system (not shown).
- the oil supply hole 116 is bored in the axial direction of the shaft 107, and the oil hole 117 accommodates the oil hole 117 in the oil supply hole 116.
- the oil supply hole 116 communicates with the space formed by the eccentric portion 108 of the shaft 107 and the piston 112 by the communication hole 118.
- the rotation of the rotor 103 is transmitted to the shaft 107, and the piston 112 fitted to the eccentric portion 108 rolls in the compression chamber.
- the compression chamber is divided into a high pressure chamber and a low pressure chamber by the vanes in contact with the piston 112, whereby the gas sucked from the suction pipe 113 is continuously compressed.
- the compressed gas is discharged from the discharge valve (not shown) into the discharge muffler 114, and then released to the internal space of the sealed container 101 and discharged from the discharge pipe 115.
- the flow of the oil 106 will be described.
- the oil drips 117 stored in the oil supply hole 116 sucks the oil 106.
- the sucked oil 106 is supplied to the sliding portion between the eccentric portion 108 and the inner periphery of the piston 112 through the communication hole 118.
- the oil 106 that has lubricated the sliding portion accumulates in the space surrounded by the inner circumference of the piston 112 and the bearing end surface.
- the accumulated oil 106 is drawn into the cylinder 109 from the end face of the piston 112 and supplied to the compression chamber to lubricate the piston 112 and the vane sliding portion and seal the compression chamber.
- the oil 106 that lubricates the compressor has dissolved therein the refrigerant enclosed in the system, and the solubility decreases as the temperature rises.
- An object of the present invention is to provide a rotary compressor capable of performing rich oiling without being blocked by air bubbles even with a low boiling point refrigerant and preventing seizing and abrasion of a bearing sliding portion.
- the present invention is a rotary compressor which uses a refrigerant containing R32, stores oil and contains a compression element in a closed container, wherein the compression element has a shaft having an eccentric portion, and the shaft A cylinder that forms a compression chamber concentrically with the rotation center, a bearing that airtightly closes both sides of the cylinder airtightly, a bearing that supports the shaft, and the eccentric part are mounted.
- a substantially spiral oil groove which opens at the bearing base and opens at the bearing end where the other end is the space inside the sealed container and discharges air bubbles caused by the refrigerant to an oil reservoir in the sealed container Those digits.
- the oil in the gap between the shaft and the bearing inner periphery is discharged into the sealed container by the viscous pump action generated by the substantially spiral oil groove. Accordingly, air bubbles generated in the sliding gap between the shaft and the bearing are forcibly discharged into the closed container together with the oil, so that it is possible to prevent the seizure and the abrasion due to the gas biting in the bearing sliding portion.
- the rotary compressor according to the present invention forcibly discharges air bubbles generated in the sliding gap between the shaft and the bearing into the sealed container, and can prevent seizure and wear due to gas biting in the bearing sliding portion. Therefore, even if a refrigerant having a low boiling point and which is easily dissolved into oil and has a low boiling point is used, excellent reliability can be ensured.
- a longitudinal sectional view of a rotary compressor according to Embodiment 1 of the present invention AA sectional view of FIG. 1 Sectional view of the secondary (main) bearing portion of the same rotary compressor An explanatory view showing an axial center locus of a shaft eccentric part of the same rotary compressor
- a longitudinal sectional view of a rotary compressor according to Embodiment 2 of the present invention Longitudinal sectional view of a conventional rotary compressor Cross section of the compression element of a conventional rotary compressor
- a first invention is a rotary compressor which uses a refrigerant containing R32, stores oil in a closed container, and accommodates a compression element, wherein the compression element has a shaft having an eccentric portion, and the shaft A cylinder that forms a compression chamber concentrically with the rotation center, a bearing that airtightly closes both sides of the cylinder airtightly, a bearing that supports the shaft, and the eccentric part are mounted.
- a substantially spiral oil groove is provided which opens at the bearing base and is open at the bearing end where the other end is the space inside the closed container and discharges air bubbles caused by the refrigerant into the closed container.
- the oil in the gap between the shaft and the bearing inner periphery is discharged into the sealed container by the viscous pump action generated by the substantially spiral oil groove. Accordingly, air bubbles generated in the sliding gap between the shaft and the bearing are forcibly discharged into the closed container together with the oil, so that it is possible to prevent the seizure and the abrasion due to the gas biting in the bearing sliding portion.
- the oil groove has a substantially spiral shape in which the opening of the bearing end portion is located on the rotation direction side of the shaft than the opening of the bearing base. It is.
- a compressor can be provided.
- the bearing comprises a main bearing that closes the upper surface side of the cylinder and a sub bearing that closes the lower surface side of the cylinder; It is provided on at least one of the bearing and the auxiliary bearing.
- air bubbles generated in at least one of the sliding portions of both bearings can be forcibly discharged into the sealed container, and gas biting in the bearing sliding portions can be reliably prevented.
- the oil groove is provided in both the main bearing and the sub bearing, and the oil groove provided in the sub bearing is provided with the width of the oil groove in the main bearing. It is wider than the width of the groove.
- the oil groove is provided on the bearing surface opposite to the acting direction of the bearing load.
- the oil groove in the area of the bearing surface where the load is small, the area of the bearing that receives the maximum load can be secured, and the reliability of the rotary compressor can be improved.
- the oil groove has a shape in which the width of the oil groove provided at the bearing end is wider than the width of the oil groove provided at the bearing base. It is
- the pump effect by the oil viscosity can be amplified on the outlet side of the bearing end where the flow of oil decreases with respect to the flow of gas, and the flow path of oil can also be secured. It is possible to provide a rotary compressor which can be suppressed and which has higher reliability.
- FIG. 1 is a longitudinal sectional view of a rotary compressor according to this embodiment
- FIG. 2 is a sectional view taken along the line AA of FIG.
- the rotary compressor shown in FIGS. 1 and 2 uses a refrigerant consisting of R32 or substantially R32.
- substantially means, for example, a state in which a refrigerant such as HFO-1234yf or HFO-1234ze is mixed mainly with R32.
- the electric element 2 and the compression element 3 are housed and sealed in the hermetic container 1, and oil is stored in the oil reservoir 3a at the bottom.
- the motorized element 2 comprises a stator 4 and a rotor 5 and drives the compression element 3 with a shaft 6 connected to the rotor 5.
- the compression element 3 is composed of a cylinder 7, a piston 9, a vane 10, a main bearing 14 and an auxiliary bearing 15.
- the cylinder 7 is fixed to the closed container 1.
- the piston 9 is rotatably fitted to an eccentric portion 8 of a shaft 6 which passes through the inside of the cylinder 7.
- the vanes 10 are fitted in the vane grooves 26 and follow the pistons 9 rolling along the inner wall surface of the cylinder 7 to reciprocate the vane grooves 26.
- the main bearing 14 and the auxiliary bearing 15 seal the upper end surface 11 and the lower end surface 12 of the cylinder 7 and support the shaft 6.
- the vane 10 is in contact with the outer peripheral surface of the piston 9 and divides the compression chamber 16 in the cylinder 7 into a high pressure chamber 16 a and a low pressure chamber 16 b.
- the suction pipe 17 is pressed into the cylinder 7 at one end and opens to the low pressure chamber 16 b of the compression chamber 16, and the other end is connected to the low pressure side of a system (not shown) outside the closed vessel 1.
- the discharge valve (not shown) opens and closes the discharge hole 18 communicating with the high pressure chamber 16a, and is accommodated in a discharge muffler (not shown) having an opening.
- the discharge pipe 20 is open at one end into the closed vessel 1, and the other end is connected to the high pressure side of a system (not shown).
- the rotation of the rotor 5 is transmitted to the shaft 6, and with the rotation of the shaft 6, the piston 9 fitted to the eccentric portion 8 rolls in the compression chamber 16.
- the inside of the compression chamber 16 is divided into the high pressure chamber 16 a and the low pressure chamber 16 b by the vane 10 that is in contact with the piston 9, whereby the gas drawn from the suction pipe 17 is continuously compressed.
- the compressed gas is released to the internal space of the sealed container 1 through the discharge hole 18 and discharged from the discharge pipe 20 to a system (not shown).
- FIG. 3 is a cross-sectional view of the auxiliary bearing 15 (and the main bearing 14) in the present embodiment.
- a substantially spiral oil groove 23 is provided on the inner circumferential wall of the hole through which the shaft 6 passes, and both ends of the bearings 15 and 14 are open at the bearing base 24 and the bearing end 25 There is.
- the oil is stored in an oil reservoir 3a at the bottom of the closed container 1. With the rotation of the shaft 6, oil is sucked from the oil supply hole 13 provided at the bottom of the shaft 6, and is supplied to the eccentric portion 8 by the effect of a centrifugal pump by oil splashes (not shown) provided in the shaft 6. Ru. Oil is supplied to the space formed by the eccentric portion 8 and the piston 9 by the communication hole 19 provided in the eccentric portion 8. The oil spreads to the sliding parts from the clearance between the eccentric part 8 and the piston 9 and the clearance between the piston 9 and the bearings 14 and 15 to lubricate each sliding part.
- the oil supplied to the space between the piston 9 and the eccentric portion 8 is attracted to the oil groove 23 of the sub bearing 15 by the viscosity pump action by the flow generated by the rotation of the shaft 6 and Flow is generated and discharged.
- the oil travels to the clearance between the shaft 6 and the auxiliary bearing 15 while moving in the oil groove 23, and lubricates the auxiliary bearing 15.
- the main bearing 14 is also carried upward from the bearing base 24 by the oil groove 23 provided in the main bearing 14 and discharged from the bearing end 25.
- the lubrication of the shaft 6 and the main bearing 14 is also performed while the oil moves in the oil groove 23.
- the flow of oil in each of the bearings 14 and 15 is forcibly generated. Therefore, even in a refrigerant environment where a refrigerant dissolved in oil tends to gasify like R32 refrigerant, gasified bubbles are forcibly discharged into the sealed container 1 and gas biting does not occur in the bearing sliding portion. It is possible to prevent the occurrence of seizing and sticking in the bearings 14 and 15.
- the width of the oil groove 23b of the auxiliary bearing 15 is wider than the width of the oil groove 23a of the main bearing 14, the following effects can also be expected.
- the refrigerant gas since the refrigerant gas has a density lower than that of the oil, the bubbles of the refrigerant gas in the oil exert a vertically upward force by the buoyancy.
- the oil groove 23a of the main bearing 14 as a flow of oil discharge from the compression element 3 into the sealed container 1, a vertically upward flow is generated. Therefore, since the direction of the buoyancy acting on the refrigerant gas and the flow direction of the oil discharge coincide with each other, bubbles of the refrigerant gas in the oil groove 23a of the main bearing 14 are easily discharged from the compression element 3 into the sealed container 1 Ru.
- the oil grooves 23a and 23b of the substantially spiral shape of each bearing 14 and 15 have the width of the oil grooves 23a and 23b provided in the bearing base 24 from the width of the oil grooves 23a and 23b provided in the bearing end 25 narrow.
- the oil groove 23 gradually expands in cross-sectional area from the bearing base 24 to the bearing end 25.
- the pump effect by viscosity can be continuously amplified toward the bearing end 25 with respect to the flow of gas, and the flow path can be further secured, so that no pressure loss due to the flow path shortage occurs. For this reason, it is possible to provide a rotary compressor with higher reliability.
- FIG. 4 shows an axial center locus of the eccentric part when it is rotated under a variable load.
- the upper part of FIG. 4 shows the direction in which the vanes 10 are mounted. It can be understood from FIG. 4 that there is a region (a portion other than the axial center locus A) where no load is applied on the side of the bearings 14 and 15.
- the load generated by compressing the gas rotates the shaft 6 eccentrically in the load direction as indicated by the axial center locus A with respect to the centers of the bearings 14 and 15.
- the oil groove 23 is provided at a place with a large load, the area of the bearings 14 and 15 receiving the load is reduced, so the contact pressure becomes extremely large, which may cause seizing and galling of the bearings 14 and 15. Therefore, if the oil groove 23 is provided at a position where the load is small, the bearing area of the portion to which the load is applied can be sufficiently secured, and a good lubrication state can be obtained.
- FIG. 5 is a longitudinal sectional view showing an essential part of a rotary compressor according to a second embodiment.
- the same functional members as in the first embodiment are given the same reference numerals, and the description thereof is omitted.
- the rotary compressor of the present embodiment is provided with a plurality of cylinders 7, for example two.
- the oil groove 23 described in the first embodiment is also adopted in a rotary compressor provided with such a plurality of cylinders 7, and similar effects can be obtained.
- the above embodiments are not limited by the type of oil.
- a mixed refrigerant of R32 and another refrigerant may be used.
- it may be a mixed refrigerant of R32 refrigerant and a hydrofluoroolefin (for example, 1234yf) having carbon-carbon double bond.
- the mixed refrigerant containing R32 may contain two or more kinds of refrigerants in addition to R32.
- air bubbles generated in the sliding gap between the shaft and the bearing can be forcibly discharged into the sealed container, and the seizure and the abrasion due to the gas biting in the bearing sliding portion can be prevented. Therefore, even if a refrigerant having a low boiling point and which is easily dissolved into oil and has a low boiling point is used, excellent reliability can be ensured. Therefore, it is useful to the compressor of the refrigerating cycle apparatus which can be utilized for electric products, such as a hot water heater, a hot-water heating apparatus, and an air conditioning apparatus.
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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
Description
2 電動要素
3 圧縮要素
3a オイル溜り
4 固定子
5 回転子
6 シャフト
7 シリンダ
8 偏心部
9 ピストン
10 ベーン
11 上端面
12 下端面
13 給油孔
14 主軸受
15 副軸受
16 圧縮室
17 吸入管
18 吐出孔
19 連通孔
20 吐出管
23、23a、23b 油溝
24 軸受基部
25 軸受端部
図5は実施の形態2のロータリ圧縮機の要部を示す縦断面図である。実施の形態1と同一の機能部材には同じ符号を付して説明を省略する。
上記実施の形態においては、R32または実質的にR32からなる冷媒を用いた場合について説明したが、R32と他の冷媒との混合冷媒であってもよい。例えば、R32冷媒と、炭素と炭素間に2重結合を有するハイドロフルオロオレフィン(例えば、1234yf)との混合冷媒であってもよい。またR32を含む混合冷媒は、R32以外に2種以上の冷媒を含んでもよい。
Claims (6)
- R32を含む冷媒を用い、
密閉容器内に、オイルを貯溜すると共に圧縮要素を収容したロータリ圧縮機であって、
前記圧縮要素は、
偏心部を有するシャフトと、
前記シャフトの回転中心と同心に圧縮室を形成するシリンダと、
前記シリンダの両側面を気密的に閉塞するとともに、前記シャフトを軸支する軸受と、
前記偏心部に装着され、前記シャフトの回転により前記シリンダの内壁に沿って転動するピストンと、
前記ピストンの外周部に接して前記圧縮室を高圧室と低圧室に仕切るベーンと
を備え、
前記軸受の内周面に、
一端が前記圧縮室側となる軸受基部に開口するとともに他端が前記密閉容器内空間側となる軸受端部に開口し、
前記冷媒による気泡を前記密閉容器内に排出する
略螺線形状の油溝を設けた
ことを特徴とするロータリ圧縮機。 - 前記油溝は、前記軸受端部の開口部が、前記軸受基部の開口部よりも前記シャフトの回転方向側に位置する略螺線形状としていることを特徴とする請求項1記載のロータリ圧縮機。
- 前記軸受は、
前記シリンダの上面側を閉塞する主軸受と、
前記シリンダの下面側を閉塞する副軸受と
からなり、
前記油溝を、前記主軸受及び前記副軸受の少なくとも一方に設けたことを特徴とする請求項1または請求項2記載のロータリ圧縮機。 - 前記油溝を、前記主軸受及び前記副軸受の双方に設け、
前記副軸受に設けた前記油溝の幅を、前記主軸受に設けた前記油溝の幅より広くした
ことを特徴とする請求項3に記載のロータリ圧縮機。 - 前記油溝を、軸受荷重の作用方向と反対側の軸受面に設けた
ことを特徴とする請求項1から請求項3のいずれか1項に記載のロータリ圧縮機。 - 前記油溝は、前記軸受基部に設けた前記油溝の幅より、前記軸受端部に設けた前記油溝の幅が広い形状とした
ことを特徴とする請求項1から請求項5のいずれか1項に記載のロータリ圧縮機。
Priority Applications (4)
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EP13849458.8A EP2913528A4 (en) | 2012-10-23 | 2013-10-22 | ROTARY COMPRESSOR |
JP2014511353A JP5685742B2 (ja) | 2012-10-23 | 2013-10-22 | ロータリ圧縮機 |
CN201380003807.4A CN103946546B (zh) | 2012-10-23 | 2013-10-22 | 回转式压缩机 |
US14/410,951 US9482231B2 (en) | 2012-10-23 | 2013-10-22 | Rotary compressor having an oil groove in an inner peripheral surface of a bearing |
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JP2012-233399 | 2012-10-23 |
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PCT/JP2013/006229 WO2014064919A1 (ja) | 2012-10-23 | 2013-10-22 | ロータリ圧縮機 |
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US (1) | US9482231B2 (ja) |
EP (1) | EP2913528A4 (ja) |
JP (2) | JP5685742B2 (ja) |
CN (1) | CN103946546B (ja) |
WO (1) | WO2014064919A1 (ja) |
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US20150322949A1 (en) | 2015-11-12 |
CN103946546B (zh) | 2016-08-24 |
EP2913528A1 (en) | 2015-09-02 |
JP2014139443A (ja) | 2014-07-31 |
JP5685742B2 (ja) | 2015-03-18 |
JPWO2014064919A1 (ja) | 2016-09-08 |
EP2913528A4 (en) | 2015-12-30 |
US9482231B2 (en) | 2016-11-01 |
JP6229947B2 (ja) | 2017-11-15 |
CN103946546A (zh) | 2014-07-23 |
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