WO2010050141A1 - 密閉型圧縮機 - Google Patents
密閉型圧縮機 Download PDFInfo
- Publication number
- WO2010050141A1 WO2010050141A1 PCT/JP2009/005449 JP2009005449W WO2010050141A1 WO 2010050141 A1 WO2010050141 A1 WO 2010050141A1 JP 2009005449 W JP2009005449 W JP 2009005449W WO 2010050141 A1 WO2010050141 A1 WO 2010050141A1
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- Prior art keywords
- piston
- cylindrical hole
- compression chamber
- compression
- dead center
- Prior art date
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- 238000007906 compression Methods 0.000 claims abstract description 172
- 230000006835 compression Effects 0.000 claims abstract description 165
- 230000002093 peripheral effect Effects 0.000 claims description 51
- 239000010687 lubricating oil Substances 0.000 claims description 31
- 239000003921 oil Substances 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000004323 axial length Effects 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 description 23
- 230000006399 behavior Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 238000007789 sealing Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
-
- 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
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/126—Cylinder liners
Definitions
- the present invention relates to a hermetic compressor used in a refrigeration cycle such as a refrigerator-freezer.
- Patent Document 1 discloses a conventional hermetic compressor that employs a reciprocating type compression mechanism.
- a hermetic compressor disclosed in Patent Document 1 includes a cylinder that forms a compression chamber having a cylindrical inner diameter, a piston that has a cylindrical outer diameter that reciprocates inside the cylinder, and a piston pin connected to the piston. And a connecting rod for connecting the eccentric shaft portions of the shaft.
- a shaft is fixed to the axial center of the rotor of the electric motor unit, and the compression mechanism is operated by the rotation of the rotor.
- a gap is required for sliding between the inner diameter of the cylinder and the outer diameter of the reciprocating piston.
- this gap is large, leakage of high-temperature and high-pressure refrigerant gas compressed in the compression chamber occurs, resulting in a reduction in compression efficiency.
- this gap is reduced, sliding loss increases and compression efficiency decreases.
- the hermetic compressor disclosed in Patent Document 1 uses a cylinder in which the inner diameter is increased from the side where the piston is located at the top dead center toward the side located at the bottom dead center. Proposed structure.
- FIG. 12A and 12B are vertical cross-sectional views of a compression unit of a hermetic compressor disclosed in Patent Document 1.
- FIG. FIG. 12A shows a state where the piston is at the bottom dead center
- FIG. 12B shows a state where the piston is at the top dead center.
- a connecting rod 26 is connected via a piston pin 25 to a piston 23 inserted in a cylindrical hole 16 provided in the cylinder block 14 so as to be reciprocally movable. Due to the eccentric motion of the eccentric shaft portion of the shaft (not shown), the connecting rod 26 drives the piston 23 to reciprocate between the bottom dead center position shown in FIG. 12A and the top dead center position shown in FIG. 12B.
- a valve plate (not shown) is mounted on the end surface on the opposite side (right side in the figure) of the cylindrical hole portion 16 when viewed from the connecting rod 26.
- a compression chamber 15 is formed by the piston 23, the cylindrical hole 16 and the valve plate.
- the cylindrical hole portion 16 is formed to have a tapered portion 17 whose inner diameter increases from Dt to Db (> Dt) from the side where the piston 23 is located at the top dead center to the side located at the bottom dead center. Has been.
- the piston 23 has the same outer diameter dimension over the entire length.
- the piston 23 is compressed until the outer peripheral surface of the piston 23 is shifted from the bottom dead center position shown in FIG. 12A to the top dead center side along the tapered portion 17 in the compression stroke for compressing the refrigerant gas.
- the pressure in the chamber 15 does not rise so much. Therefore, even if the gap is relatively large, leakage of the refrigerant gas hardly occurs due to the sealing effect by the lubricating oil, and the sliding resistance of the piston 23 is small.
- the present invention solves the conventional problems, and in the initial stage of the compression stroke, the piston tilt direction is reversed with respect to the axial center of the cylindrical hole.
- This provides a hermetic compressor that is formed so as to reduce contact between the piston and the taper portion during reversal than when the piston tilt direction is reversed after the middle stage of the compression stroke, thereby reducing noise. It is.
- a compression element includes a main shaft portion that is rotationally driven by an electric element, a shaft having an eccentric shaft portion that is formed so as to move integrally with the main shaft portion, a cylindrical hole that forms a compression chamber, and a bearing that supports the main shaft portion.
- a cylinder block having a portion, a piston inserted in a cylindrical hole portion so as to be able to reciprocate, and a connecting mechanism for connecting the eccentric shaft portion and the piston.
- the cylindrical hole portion has a tapered portion formed so that the inner diameter increases from the side where the piston is located at the top dead center toward the side located at the bottom dead center, and the piston is in the initial stage of the compression stroke.
- the inclination direction is reversed with respect to the axial center of the cylindrical hole.
- FIG. 1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention.
- FIG. 2 is a longitudinal sectional view of a main part of a compression unit of the hermetic compressor according to the embodiment.
- FIG. 3 is a main part longitudinal sectional view showing design specifications of the compression part of the hermetic compressor according to the embodiment.
- FIG. 4 is a cross-sectional view of the main part showing the design specifications of the compression part of the hermetic compressor in the same embodiment.
- FIG. 5A is a schematic diagram sequentially illustrating the behavior of the piston 123 in the compression stroke of the hermetic compressor according to the embodiment.
- FIG. 1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention.
- FIG. 2 is a longitudinal sectional view of a main part of a compression unit of the hermetic compressor according to the embodiment.
- FIG. 3 is a main part longitudinal sectional view showing design specifications of the compression part of the
- FIG. 5B is a schematic diagram sequentially illustrating the behavior of the piston 123 in the compression stroke of the hermetic compressor according to the embodiment.
- FIG. 6A is a schematic diagram sequentially illustrating the behavior of the piston 123 in the compression stroke of the hermetic compressor according to the embodiment.
- FIG. 6B is a schematic diagram sequentially illustrating the behavior of the piston 123 in the compression stroke of the hermetic compressor according to the embodiment.
- FIG. 7A is a schematic diagram sequentially illustrating the behavior of the piston 123 in the compression stroke of the hermetic compressor according to the embodiment.
- FIG. 7B is a schematic diagram sequentially illustrating the behavior of the piston 123 in the compression stroke of the hermetic compressor according to the embodiment.
- FIG. 8A is a schematic diagram sequentially illustrating the behavior of the piston 123 in the compression stroke of the hermetic compressor according to the embodiment.
- FIG. 8B is a schematic diagram sequentially illustrating the behavior of the piston 123 in the compression stroke of the hermetic compressor according to the embodiment.
- FIG. 9 is a characteristic diagram showing a relationship between a rotation angle and noise obtained by an example of design specifications in the hermetic compressor according to the embodiment.
- FIG. 10 is a main part longitudinal cross-sectional view showing the design specifications of the compression part of the hermetic compressor according to the second embodiment of the present invention.
- FIG. 11 is a cross-sectional view of the main part showing the design specifications of the compression unit of the hermetic compressor in the same embodiment.
- FIG. 12A is a longitudinal sectional view of a compression unit of a conventional hermetic compressor.
- FIG. 12B is a longitudinal sectional view of a compression unit of a conventional hermetic compressor.
- FIG. 1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention.
- FIG. 2 is a longitudinal sectional view of a main part of the compression unit in the same embodiment.
- FIG. 3 is a main part longitudinal sectional view showing design specifications of the compression part in the embodiment.
- FIG. 4 is a cross-sectional view of the main part showing the design specifications of the compression part in the same embodiment.
- an electric element 105 including a stator 105 a and a rotor 105 b and a compression element 107 driven by the electric element 105 are accommodated in the hermetic container 103. Furthermore, lubricating oil 101 is stored at the bottom of the sealed container 103.
- the shaft 113 has a main shaft portion 109 and an eccentric shaft portion 111 formed eccentrically at one end so as to move integrally with the main shaft portion 109.
- the main shaft portion 109 is fixed to the shaft center of the rotor 105b.
- the bearing portion 119 forms a cantilever bearing by pivotally supporting the end portion on the eccentric shaft portion 111 side of the main shaft portion 109 of the shaft 113.
- the cylinder block 121 has a substantially cylindrical cylindrical hole 117 and a bearing portion 119 which are arranged so as to be fixed to each other at a fixed position.
- a piston 123 is inserted into the cylindrical hole 117 so as to be able to reciprocate.
- One end of the connecting rod 125 which is a connecting mechanism is connected to the eccentric shaft portion 111, and the other end is connected to the piston 123 via the piston pin 136.
- An oil supply passage 128 is provided in the shaft 113 and on the outer peripheral surface. One end (upper end) of the oil supply passage 128 communicates with an oil supply hole 128 a provided in the eccentric shaft portion 111. Further, the end of the main shaft 109 opposite to the eccentric shaft 111, that is, the lower end extends so that the oil supply passage 128 penetrates to a predetermined depth of the lubricating oil 101.
- a valve plate 139 is provided on the end face of the cylindrical hole 117.
- the cylindrical hole 117 is provided in the cylinder block 121 so as to form the compression chamber 115 together with the piston 123 and the valve plate 139.
- the inner diameter increases from D1 to D3 (> D1) from the side where the piston 123 is located at the top dead center to the side located at the bottom dead center.
- a tapered portion 127 is formed.
- a straight portion 129 having an inner diameter dimension constant in the axial direction is formed at a position corresponding to the end portion on the compression chamber 115 side of the piston 123 reaching the top dead center in the section of the axial length L1.
- the piston 123 is formed with the same outer diameter D2 over the entire length.
- the cylindrical hole portion 117 of the cylinder block 121 is formed so that the anti-compression chamber 115 side of the piston 123 is exposed in the sealed container 103 in a state where the piston 123 is located at the bottom dead center. ing.
- a substantially annular (including annular) oil supply groove 131 is provided in a concave shape on the compression chamber 115 side of the outer peripheral surface 133 of the piston 123.
- a part of the peripheral wall of the cylindrical hole 117 is formed such that at least a part of the oil supply groove 131 is exposed from the cylindrical hole 117 and communicates with the sealed container 103.
- a cutout portion 120 is formed.
- the outer diameter dimension of the piston 123 is D2
- the eccentric amount of the eccentric shaft portion 111 with respect to the main shaft portion 109 is e.
- the distance from the connection center between the connecting rod 125 and the piston 123, that is, the center of the piston pin 136 to the compression chamber side end surface 134 of the piston 123 (hereinafter referred to as the main sliding surface dimension) is L2.
- a rotation angle of the main shaft 109 when the piston 123 is located at the top dead center is set to zero, and an arbitrary rotation angle of the main shaft 109 is set to ⁇ .
- An angle formed by the axial center of the compression chamber 115 and the tapered portion 127 is ⁇ .
- the inner diameter dimension D1 of the cylindrical hole 117, the outer diameter dimension D2 of the piston 123, the length L1 of the straight section 129, the main sliding surface dimension L2, the eccentricity e, and the rotation angle ⁇ are defined in the cylindrical hole section 117.
- the design specifications for obtaining the end coordinates of the tip position of the piston 123 in the cylindrical hole 117 are shown.
- the angle ⁇ formed by the tapered portion 127 is the specification value 3 of the difference (D1 ⁇ D2) between the inner diameter D1 of the cylindrical hole 117 and the outer diameter D2 of the piston 123. / 2 divided by the coordinate position ⁇ L1 ⁇ L2 + 2e (1 ⁇ cos ⁇ ) ⁇ of the piston tip on the top dead center side when the top dead center position of the piston 123 is zero (hereinafter referred to as a specification value) It is set within a range obtained by multiplying ⁇ by a coefficient in the range of 0.4 to 2.0.
- the specification value 3/2 is a value derived from the above-described design specification (value) when obtaining the end coordinates of the tip position of the piston 123 in the cylindrical hole 117.
- the angle ⁇ is determined based on the internal dimensions D1 of the cylindrical hole 117, the outer diameter D2 of the piston 123, the length L1 of the straight portion 129, the main slide, which are the above-described design specifications.
- a specification value ⁇ expressed by (Equation 1) based on the moving surface dimension L2, the eccentricity e, and the rotation angle ⁇ is defined, and is defined by (Equation 2) based on this specification value ⁇ .
- the rotation angle ⁇ of the main shaft portion 109 is in the range of ⁇ to 4 ⁇ / 3 (rad) as the initial rotation angle of the compression stroke.
- ⁇ ⁇ 3 (D1-D2) / 2 ⁇ / ⁇ L1-L2 + 2e (1-cos ⁇ ) ⁇ (Equation 1)
- the coefficient of the specification value ⁇ (0.4 and 2.0 in the present embodiment) is a value that is appropriately determined in view of the machining tolerance of the tapered portion 127 and the like, depending on the material of the cylinder block 121 and the like. You only have to set it.
- the rotor 105 b of the electric element 105 rotates the shaft 113, and the rotational movement of the eccentric shaft portion 111 is transmitted to the piston 123 via the connecting rod 125.
- the piston 123 reciprocates in the cylindrical hole 117.
- the refrigerant gas is sucked into the compression chamber 115 from a cooling system (not shown), compressed, and then discharged to the cooling system again.
- the lower end portion of the oil supply passage 128 is adapted to perform a pump action by the rotation of the shaft 113. Due to this pumping action, the lubricating oil 101 at the bottom of the sealed container 103 is pumped upward through the oil supply passage 128 and reaches the oil supply hole 128a. As a result, the lubricating oil 101 that has reached the oil supply hole 128a scatters horizontally from the upper end of the shaft 113 in the entire circumferential direction in the sealed container 103, and is supplied to the piston pin 136, the piston 123, and the like to perform lubrication.
- the pressure in the compression chamber 115 does not increase so much until the piston 123 moves from the bottom dead center position shown in FIG. 3 to the top dead center side in the compression stroke for compressing the refrigerant gas. Therefore, even if the clearance between the outer peripheral surface 133 of the piston 123 and the tapered portion 127 is relatively large, leakage of the refrigerant gas hardly occurs due to the sealing effect by the lubricating oil 101, and the sliding resistance of the piston 123 is small.
- the pressure in the compression chamber 115 rapidly increases immediately before the compression stroke proceeds, and immediately before the pressure of the refrigerant gas in the compression chamber 115 gradually increases and the piston 123 reaches a position near the top dead center.
- the gap between the outer peripheral surface 133 of the piston 123 and the tapered portion 127 is reduced on the top dead center side, the occurrence of refrigerant gas leakage can be reduced.
- the straight portion 129 acts to reduce the leakage of the refrigerant gas that has increased to a predetermined discharge pressure as compared with the case where the straight portion 129 is tapered.
- the connecting rod 125 side of the piston 123 is formed to be exposed from the cylinder block 121 in a state where the piston 123 is located at the bottom dead center. Therefore, the lubricating oil 101 scattered from the upper end of the shaft 113 is sufficiently supplied to the outer peripheral surface 133 of the piston 123 and held.
- the substantially annular oil supply groove 131 moves to a position facing the straight portion 129 of the cylindrical hole portion 117, the lubricating oil 101 is easily carried to the straight portion 129 having the largest sliding resistance. .
- FIGS. 5A, 5B to 8A, and 8B are schematic diagrams for explaining the behavior of the piston 123 in the present embodiment.
- FIG. 5A, FIG. 5B to FIG. 8A, FIG. 8B are schematic diagrams sequentially showing the behavior of the piston 123 in the compression stroke.
- 5A to 8A are schematic views showing the side surface of the compression chamber 115.
- FIG. 5B to 8B are schematic views showing the side surface of the shaft 113.
- FIG. 5A, 5B to 7A, and 7B show the initial state of the compression stroke, and
- FIGS. 8A and 8B show the late state of the compression stroke, respectively.
- FIG. 9 is a characteristic diagram showing the relationship between the rotation angle and noise obtained by an example of the design specifications in the hermetic compressor of the present embodiment.
- the bearing portion 119 forms a cantilever bearing that pivotally supports the end portion on the eccentric shaft portion 111 side of the main shaft portion 109 of the shaft 113. Therefore, the shaft 113 is inclined within the clearance between the main shaft portion 109 and the bearing portion 119. Moreover, it is known that the direction and the inclination angle are complex behaviors that vary depending on the driving conditions.
- the piston 123 is positioned within the range of the tapered portion 127 in the cylindrical hole portion 117. Therefore, since the piston 123 can be easily inclined with a slight force, it is considered that the piston 123 normally slides along one of the inner wall surfaces of the tapered portion 127.
- the shaft 113 is largely inclined toward the anti-compression chamber 115 starting from the fact that the tip edge portion 135 on the outer peripheral surface 133b side of the piston 123 not sliding with the taper portion 127 is in contact with the taper portion 127. It is considered that the inclination direction of the piston 123 may be reversed with respect to the axial center of the cylindrical hole 117.
- the inclination of the piston 123 is corrected so that the axis of the piston 123 substantially coincides with the axis of the straight portion 129 in the cylindrical hole 117, and the piston 123 further moves to the compression chamber 115 side.
- the leakage of the refrigerant gas that has increased to a predetermined discharge pressure is reduced more than when the straight portion 129 is tapered.
- the tapered portion 127 is designed with the timing range (hereinafter referred to as the rotation angle ⁇ 1) associating that the tip edge portion 135 of the piston 123 is in contact with the tapered portion 127 as the initial stage of the compression stroke.
- the noise is smaller than that in the case where the tapered portion 127 is designed by setting the timing range to the middle or later of the compression stroke.
- the outer peripheral surface 133a of the piston 123 is compressed along the tapered portion 127.
- the tapered edge portion 135 of the outer peripheral surface 133b of the piston 123 that does not slide with the tapered portion 127 contacts the tapered portion 127 with which the outer peripheral surface 133 does not slide.
- 127 and the compression element 107 may be designed.
- the tip edge portion 135 of the piston 123 contacts the tapered portion 127 in the initial stage of the compression stroke
- the upper end of the piston 123 on the compression chamber 115 side adjacent to the tapered portion 127 is provided at a portion of the cylindrical hole portion 117 corresponding to the portion.
- the straight portion 129 is provided, the leakage of the refrigerant gas increased to a predetermined discharge pressure can be reduced as compared with the case where the straight portion 129 is tapered.
- the tip edge portion 135 of the piston 123 contacts the tapered portion 127 because the outer diameter D2 of the piston 123 and the minimum inner diameter of the compression chamber 115 (in this embodiment, the inner diameter D1 of the straight portion 129). This is the timing when the difference from) has become smaller. Therefore, the geometrically contacting portion is a tapered portion 127 in the vicinity of the straight portion 129.
- the timing at which the tip edge portion 135 of the piston 123 contacts the tapered portion 127 can be made earlier, but the axial length of the tapered portion 127 is shortened accordingly. The effect of reducing the sliding resistance at the taper portion 127 is reduced.
- the straight portion 129 is provided to reduce the leakage of the refrigerant gas in the compression chamber 115, and the timing at which the tip edge portion 135 of the piston 123 contacts the tapered portion 127 is the initial stage of the compression stroke, and the straight portion 129.
- the axial length of the taper portion 127 is secured by suppressing the axial length of the taper portion 127, and it is necessary to satisfy both conflicting effects of reducing the sliding resistance at the taper portion 127.
- Fig. 9 shows the experimental results of an example of the above design specifications.
- a solid line 91 indicates the noise level according to the design specifications of the present invention
- a dotted line 92 indicates the noise level according to the conventional design specifications.
- a solid line 93 indicates the range of the rotation angle ⁇ 1 according to the design parameters of the present invention
- a dotted line 94 indicates the range of the rotation angle ⁇ 1 according to the conventional design parameters.
- the inner diameter D1 of the cylindrical hole 117 is about 22.01 mm
- the outer diameter D2 of the piston 123 is about 22 mm (D1> D2)
- the main sliding surface dimension L2 is about 13 mm
- the eccentricity e is
- the length L1 of the straight portion 129 which is one of the design specifications, was set to about 4 mm, 8 mm, 10 mm (rotation angle ⁇ : about 190 °, about 210 °: about 225 °), etc., and the noise value was measured. It is a result.
- the angle ⁇ in this experiment was in the range of 0.03 ° to 0.05 °. However, it goes without saying that this range includes some tolerances.
- design specifications such as the cylindrical hole 117 and the piston 123 are set, and the timing at which the tip edge portion 135 of the piston 123 contacts the taper portion 127 is set to about 180 ° (the initial stage of the compression process). ) To about 240 ° in the middle of the compression process, an improvement in noise characteristics can be expected.
- the lubricating oil 101 sufficiently supplied to the outer peripheral surface 133 of the piston 123 can relieve the contact between the outer peripheral surface 133 of the piston 123 and the tapered portion 127, thereby realizing high efficiency and low noise. it can.
- an oil supply groove 131 is provided in a concave shape on the outer periphery of the piston 123, and a part of the peripheral wall of the cylindrical hole 117 is formed so that the oil supply groove 131 communicates with the inside of the sealed container 103 in the vicinity of the bottom dead center of the piston 123.
- the notch and the notch 120 are formed.
- the lubricating oil 101 scattered in the entire circumferential direction in the sealed container 103 from the upper end of the oil supply hole 128 a provided in the eccentric shaft portion 111 of the shaft 113 is held by the oil supply groove 131, and the inside of the cylindrical hole portion 117.
- the taper portion 127 and the straight portion 129 can be sufficiently supplied. Therefore, the sealing effect by the lubricating oil 101 is obtained, and the leakage of the refrigerant gas can be reduced.
- the lubricating oil 101 sufficiently supplied to the outer peripheral surface 133 of the piston 123 can alleviate the contact between the outer peripheral surface 133 of the piston 123 and the tapered portion 127, thereby realizing high efficiency and low noise. Can do.
- the connecting mechanism of the eccentric shaft portion 111 and the piston 123 is the connecting rod 125.
- a connecting mechanism having a movable portion such as a ball joint
- FIG. 10 is a vertical cross-sectional view of the main part showing the design specifications of the compression part in the present embodiment.
- FIG. 11 is a cross-sectional view of a principal part showing design specifications of the compression part in the same embodiment.
- a third center line 142 parallel to the first center line 141 showing the axis of the bearing portion 119 and the axis of the compression chamber 115 are shown.
- the bearing portion 119 and the compression chamber 115 are arranged so that the two center lines 143 intersect each other.
- the first center line 141 and the third center line 142 are represented by dots since FIG. 11 is a cross-sectional view.
- the distance between the offset line 144 passing through the first center line 141 and parallel to the second center line 143 and the second center line 143 (hereinafter referred to as the offset distance) is s. . Therefore, the bearing portion 119 is offset from the compression chamber 115. In the first embodiment, there is no offset.
- the rotation direction of the shaft 113 is a clockwise direction when viewed from above in FIG. Therefore, the offset arrangement of the bearing portion 119 and the compression chamber 115 plays a role of reducing sliding loss between the cylinder block 121 and the piston 123.
- the offset distance s is one of the design parameters in the present embodiment, and is added to the design parameters of the first embodiment. Specifically, the offset distance s is designed in the range of 1 to 4 mm. It is 2 mm as a hermetic compressor for a refrigerator.
- the angle ⁇ formed by the axial center of the compression chamber 115 and the taper portion 127 is defined by (Expression 2) described in the first embodiment.
- the angle ⁇ is defined as the inner diameter D1 of the cylindrical hole 117, the outer diameter D2 of the piston 123, the length L1 of the straight portion 129, the main sliding surface dimension L2 defined in the first embodiment, the eccentricity e,
- the rotation angle ⁇ and the offset distance s of the main shaft 109 are set as design specifications.
- the numerical value 3/2 of the difference (D1-D2) between the inner diameter D1 of the cylindrical hole 117 and the outer diameter D2 of the piston 123 is set to zero, and the top dead center position of the piston 123 is set to zero.
- the value ⁇ divided by the coordinate position ⁇ L1-L2 + 2A ⁇ of the piston tip at the top dead center is multiplied by a coefficient in the range of 0.4 to 2.0. .
- A is a configuration that employs an offset arrangement of the bearing portion 119 and the compression chamber 115, it is necessary to correct the coordinate position of the above-described piston tip, so that the calculation formula is simplified. This is the substitution formula used.
- the specification value 3/2 was derived from the above-described design specification (value) when obtaining the end coordinates of the tip position of the piston 123 in the cylindrical hole 117, as in the first embodiment. It is a numerical value.
- an electric element and a compression element driven by the electric element are accommodated in a sealed container storing lubricating oil
- the compression element is a main shaft that is rotationally driven by the electric element.
- a shaft having an eccentric shaft portion formed so as to move integrally with the head portion and the main shaft portion, a cylinder hole having a cylindrical hole portion that forms a compression chamber and a bearing portion that pivotally supports the main shaft portion, and a cylindrical hole portion.
- a piston inserted in a reciprocating manner, and a connecting mechanism that connects the eccentric shaft portion and the piston, and the cylindrical hole portion extends from the side where the piston is located at the top dead center to the side located at the bottom dead center.
- the piston has a taper portion formed so that the inner diameter dimension increases, and the piston has a configuration in which the inclination direction is reversed with respect to the axis of the cylindrical hole portion in the initial stage of the compression stroke.
- the piston has a configuration in which the inclination direction is reversed with respect to the axial center of the cylindrical hole portion, with the starting edge portion on the compression chamber side coming into contact with the tapered portion.
- the cylindrical hole portion when the piston is located near the top dead center, has an inner diameter dimension in an axial direction in a portion adjacent to the tapered portion and corresponding to the upper end portion on the compression chamber side of the piston. It has the structure which has the straight part which is constant.
- the refrigerant gas hardly leaks and the sliding resistance of the piston becomes small. Further, in a state where the compression stroke is advanced and the piston is close to the top dead center position, the leakage of the refrigerant gas accompanying the increase in the compression pressure of the refrigerant gas can be reduced as compared with the case where the tapered portion is formed over the entire length. Therefore, a high refrigeration capacity can be obtained.
- the axial length of the straight portion is L1
- the minimum inner diameter of the compression chamber is D1
- the outer diameter of the piston is D2
- the eccentric amount of the eccentric shaft with respect to the main shaft is e.
- L2 is the distance from the coupling center of the coupling mechanism and the piston to the compression chamber side end surface, and the rotation angle of the main shaft when the piston is located at the top dead center is zero.
- the angle ⁇ is the design dimension of the cylindrical hole inner diameter dimension D1, the piston outer diameter dimension D2, the straight section A specification value ⁇ represented by (Equation 1) based on the length L1, the main sliding surface dimension L2, the eccentricity e, and the rotation angle ⁇ is defined, and this specification value ⁇ is used as a basis (Equation 2). Defined by
- the piston behavior is specifically adjusted so that the contact of the piston with the taper portion can be relaxed by reversing the tilt direction of the piston with respect to the axial center of the cylindrical hole.
- the design specifications of the hermetic compressor can be determined. Therefore, the contact when the piston tilt direction is reversed and the outer peripheral surface of the piston is in contact with the tapered portion can be more relaxed than when the contact is reversed after the middle stage of the compression stroke.
- the rotation angle ⁇ of the main shaft portion where the tilt direction of the piston is reversed is set, the inner diameter dimension D1 of the cylindrical hole portion, the outer diameter dimension D2 of the piston, the length L1 of the straight portion, the main sliding surface dimension L2, the eccentricity
- the design value of the quantity e it is possible to perform a specific design such as determining the angle ⁇ formed by the axial center of the compression chamber and the tapered portion.
- the piston when the piston is located at the bottom dead center, at least the lower end portion of the piston is formed to be exposed from the cylindrical hole portion, and the rotational angle ⁇ of the main shaft portion is ⁇ to 4 ⁇ / 3 (rad ).
- the piston has a configuration in which an oil supply groove is provided in a concave shape on the outer peripheral surface, and the oil supply groove communicates with the inside of the sealed container near the bottom dead center of the piston.
- the bearing portion and the compression chamber intersect each other with a third center line parallel to the first center line indicating the axis of the bearing portion and a second center line indicating the axis of the compression chamber. It has the structure arranged to do.
- the axial length of the straight portion is L1
- the minimum inner diameter of the compression chamber is D1
- the outer diameter of the piston is D2
- the eccentric amount of the eccentric shaft with respect to the main shaft is e.
- L2 is the distance from the coupling center of the coupling mechanism and the piston to the compression chamber side end surface, and the rotation angle of the main shaft when the piston is located at the top dead center is zero. Is set to ⁇ , the offset distance (distance between the first center line and the third center line) is set to s, and the angle formed by the axial center of the compression chamber and the taper portion is set to ⁇ , the angle ⁇ is the design specification.
- the rotation angle ⁇ of the main shaft portion where the tilt direction of the piston is reversed is set, the inner diameter dimension D1 of the cylindrical hole portion, the outer diameter dimension D2 of the piston, the length L1 of the straight portion, the main sliding surface dimension (piston pin The distance ⁇ from the center of the piston to the compression chamber side end surface) L2, the eccentricity e, and the offset distance s are set to determine the angle ⁇ formed by the compression chamber axis and the tapered portion. You can make a design.
- the piston when the piston is located at the bottom dead center, at least the lower end portion of the piston is formed to be exposed from the cylindrical hole portion, and the rotation angle ⁇ of the main shaft portion is ⁇ to 4 ⁇ / 3 (rad ).
- the hermetic compressor of the present invention can reduce the sliding loss of the piston, reduce the input, obtain high efficiency, reduce the collision, and reduce the noise. Therefore, it can be applied to all uses using a refrigeration cycle such as a household refrigerator, a dehumidifier, a showcase, and a vending machine.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
Description
図1は、本発明の実施の形態1における密閉型圧縮機の縦断面図である。図2は、同実施の形態における圧縮部の要部縦断面図である。図3は、同実施の形態における圧縮部の設計諸元を示す要部縦断面図である。図4は、同実施の形態における圧縮部の設計諸元を示す要部横断面図である。
γ={3(D1-D2)/2}/{L1-L2+2e(1-cosθ)} (数1)
0.4γ≦tan(α)≦2.0γ、 α>0 (数2)
なお、諸元値γの係数(本実施の形態では0.4と2.0)は、テーパ部127の加工公差などを鑑みて適宜定めた値であり、シリンダブロック121の材質などに応じて設定すればよい。
本実施の形態は、実施の形態1と比べ、軸受部119と圧縮室115の配置が異なっている。その他の構成は、実施の形態1と同じである。したがって、本実施の形態では、実施の形態1と異なる構成を主体に説明する。
γ={3(D1-D2)/2}/{L1-L2+2A} (数3)
A=√{(e2(1-cosθ)2-s2} (数4)
以上のように、本実施の形態では、軸受部119が圧縮室115に対してオフセット配置されている。そのため、実施の形態1の効果に加え、シリンダブロック121とピストン123との摺動損失の低減を図ることができる。
103 密閉容器
105 電動要素
105a 固定子
105b 回転子
107 圧縮要素
109 主軸部
111 偏心軸部
113 シャフト
115 圧縮室
117 円筒形孔部
119 軸受部
120 切り欠き部
121 シリンダブロック
123 ピストン
125 コンロッド
127 テーパ部
128 給油通路
128a 給油孔
129 ストレート部
131 給油溝
133,133a,133b 外周面
134 圧縮側端面
135 先端エッジ部
136 ピストンピン
137 バランスウエイト
139 バルブプレート
141 第1の中心線
142 第3の中心線
143 第2の中心線
144 オフセット線
Claims (9)
- 潤滑油を貯留した密閉容器内に、電動要素と、前記電動要素によって駆動される圧縮要素とが収容され、前記圧縮要素は、前記電動要素によって回転駆動される主軸部および前記主軸部と一体運動するように形成された偏心軸部を有するシャフトと、圧縮室を形成する円筒形孔部および前記主軸部を軸支する軸受部を有するシリンダブロックと、前記円筒形孔部に往復動可能に挿設されたピストンと、前記偏心軸部と前記ピストンとを連結する連結機構とを備え、前記円筒形孔部は、前記ピストンが上死点に位置する側から下死点に位置する側に向かって内径寸法が増大するように形成されたテーパ部を有し、前記ピストンは、圧縮行程の初期に、傾斜方向が前記円筒形孔部の軸心に対して反転する密閉型圧縮機。
- 前記ピストンは、前記圧縮室側の先端エッジ部が前記テーパ部に接触することを起点として、前記傾斜方向が前記円筒形孔部の軸心に対して反転する請求項1に記載の密閉型圧縮機。
- 前記円筒形孔部は、前記ピストンが前記上死点近傍に位置するとき、前記テーパ部に隣接して前記ピストンの圧縮室側の上端部に対応する部位に、内径寸法が前記軸心方向に一定であるストレート部を有する請求項1に記載の密閉型圧縮機。
- 前記ストレート部の軸方向長さをL1とし、前記圧縮室の最小の内径寸法をD1とし、前記ピストンの外径寸法をD2とし、前記主軸部に対する前記偏心軸部の偏心量をeとし、前記連結機構と前記ピストンとの連結中心から前記ピストンの前記圧縮室側端面までの距離をL2とし、前記ピストンが上死点に位置する時の前記主軸部の回転角度を零(ゼロ)として前記主軸部の任意の回転角度をθとし、前記圧縮室の軸心と前記テーパ部のなす角度をαとしたときに、前記αと、前記D1、前記D2、前記L1、前記L2、前記e、前記θにより(数1)で表される諸元値γとが、(数2)を満足する関係にある請求項3に記載の密閉型圧縮機。
γ={3(D1-D2)/2}/{L1-L2+2e(1-cosθ)} (数1)
0.4γ≦tan(α)≦2.0γ、 α>0 (数2) - 前記ピストンは、前記下死点に位置するとき、少なくとも前記ピストンの下端部は前記円筒形孔部から露出するように形成され、前記主軸部の回転度θは、π~4π/3(rad)の範囲である請求項4に記載の密閉型圧縮機。
- 前記ピストンは、外周面に給油溝を凹状に設け、前記給油溝は前記ピストンの前記下死点近傍で前記密閉容器内と連通する請求項1に記載の密閉型圧縮機。
- 前記軸受部および前記圧縮室は、前記軸受部の軸心を示す第1の中心線に平行な第3の中心線と前記圧縮室の軸心を示す第2の中心線とが互いに交差するように配置された請求項3に記載の密閉型圧縮機。
- 前記ストレート部の軸方向長さをL1とし、前記圧縮室の最小の内径寸法をD1とし、前記ピストンの外径寸法をD2とし、前記主軸部に対する前記偏心軸部の偏心量をeとし、前記連結機構と前記ピストンとの連結中心から前記ピストンの前記圧縮室側端面までの距離をL2とし、前記ピストンが前記上死点に位置する時の前記主軸部の回転角度を零として前記主軸部の任意の回転角度をθとし、前記第1の中心線と前記第3の中心線の距離をsとし、前記圧縮室の軸心と前記テーパ部のなす角度をαとしたときに、前記αと、前記D1、前記D2、前記L1、前記L2、前記e、前記θ、前記sにより(数3)で表される諸元値γとが、前記(数2)を満足する関係にある請求項7に記載の密閉型圧縮機。
γ={3(D1-D2)/2}/{L1-L2+2A} (数3)
ここで、A=√{(e2(1-cosθ)2-s2} (数4) - 前記ピストンは、前記下死点に位置するとき、少なくとも前記ピストンの下端部は前記円筒形孔部から露出するように形成され、前記主軸部の回転角度θは、π~4π/3(rad)の範囲である請求項8に記載の密閉型圧縮機。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2010502588A JP5136639B2 (ja) | 2008-10-29 | 2009-10-19 | 密閉型圧縮機 |
CN2009801086083A CN101970879B (zh) | 2008-10-29 | 2009-10-19 | 密闭型压缩机 |
US13/119,494 US20110176942A1 (en) | 2008-10-29 | 2009-10-19 | Sealed compressor |
EP09823255.6A EP2256344A4 (en) | 2008-10-29 | 2009-10-19 | Sealed compressor |
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JP2008277972 | 2008-10-29 | ||
JP2008277973 | 2008-10-29 | ||
JP2008-277973 | 2008-10-29 | ||
JP2008-277972 | 2008-10-29 |
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WO2010050141A1 true WO2010050141A1 (ja) | 2010-05-06 |
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PCT/JP2009/005449 WO2010050141A1 (ja) | 2008-10-29 | 2009-10-19 | 密閉型圧縮機 |
Country Status (5)
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US (1) | US20110176942A1 (ja) |
EP (1) | EP2256344A4 (ja) |
JP (1) | JP5136639B2 (ja) |
CN (1) | CN101970879B (ja) |
WO (1) | WO2010050141A1 (ja) |
Cited By (3)
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JP2012082785A (ja) * | 2010-10-14 | 2012-04-26 | Panasonic Corp | 圧縮機 |
JP2012087710A (ja) * | 2010-10-21 | 2012-05-10 | Panasonic Corp | 密閉型圧縮機および冷凍装置 |
JP2013044255A (ja) * | 2011-08-23 | 2013-03-04 | Hitachi Appliances Inc | 密閉型圧縮機及びこれを用いた冷蔵庫 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6154090B1 (ja) * | 2015-12-25 | 2017-06-28 | パナソニック株式会社 | 密閉型圧縮機およびそれを用いた冷凍装置 |
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- 2009-10-19 WO PCT/JP2009/005449 patent/WO2010050141A1/ja active Application Filing
- 2009-10-19 US US13/119,494 patent/US20110176942A1/en not_active Abandoned
- 2009-10-19 EP EP09823255.6A patent/EP2256344A4/en not_active Withdrawn
- 2009-10-19 JP JP2010502588A patent/JP5136639B2/ja not_active Expired - Fee Related
- 2009-10-19 CN CN2009801086083A patent/CN101970879B/zh not_active Expired - Fee Related
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JP2012082785A (ja) * | 2010-10-14 | 2012-04-26 | Panasonic Corp | 圧縮機 |
JP2012087710A (ja) * | 2010-10-21 | 2012-05-10 | Panasonic Corp | 密閉型圧縮機および冷凍装置 |
JP2013044255A (ja) * | 2011-08-23 | 2013-03-04 | Hitachi Appliances Inc | 密閉型圧縮機及びこれを用いた冷蔵庫 |
Also Published As
Publication number | Publication date |
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CN101970879B (zh) | 2013-08-07 |
US20110176942A1 (en) | 2011-07-21 |
EP2256344A4 (en) | 2018-03-07 |
CN101970879A (zh) | 2011-02-09 |
EP2256344A1 (en) | 2010-12-01 |
JPWO2010050141A1 (ja) | 2012-03-29 |
JP5136639B2 (ja) | 2013-02-06 |
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