JP2012036847A - Hermetic compressor and refrigerator using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of reducing an amount of a lubricating oil inhaled in a cylinder and enhancing the lubricity of a piston sliding surface, and to provide a refrigerator using the same.SOLUTION: The hermetic compressor includes a piston housing a motor element and a compression element in a hermetic container and performing reciprocating motion in a cylinder, a crank shaft connected to the piston and a frame having a bearing journaling the crank shaft. The hermetic compressor has a groove on a side of the cylinder of the frame in a position higher than the lower end of the cylinder inside diameter and lower than the upper end of the cylinder inside diameter.

Description

  The present invention relates to a hermetic compressor and a refrigerator using the same.

  As a conventional hermetic compressor, disclosed in Japanese Patent Application Laid-Open No. 2006-37716 (Patent Document 1), Japanese Patent Application Laid-Open No. 2004-27969 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2004-156512 (Patent Document 3). Things are known.

  Patent Document 1 has a frame in which a bearing portion for supporting a main shaft and a cylinder portion having a cylinder chamber are integrated, and a notch for assembling a rod is provided on a side wall portion of the cylinder. .

  Patent Document 2 stores lubricating oil in a sealed container, an electric element and a compression element, and a shaft that transmits the rotational force of the electric element to the compression element. The electric element includes a stator and a rotor, and the rotor is inserted into the shaft. An auxiliary bearing is installed at the upper end of the shaft, and an oil supply passage for introducing lubricating oil to the piston sliding surface is provided at the upper end of the auxiliary bearing.

  Patent Document 3 discloses that an eccentric shaft portion is located above the main shaft portion, and lubricant oil stored in the bottom portion of the sealed container during rotation is pumped up using centrifugal force and scattered from the upper end portion into the sealed container. A cylinder block formed with a shaft that forms an oil supply passage to be supplied, a substantially cylindrical compression chamber, and a main bearing that is formed so as to be substantially orthogonal to the axis of the compression chamber and that supports the main shaft portion; A piston that reciprocates in a compression chamber; and a connecting means that connects the piston and the eccentric shaft portion; and forming an oil pool for storing lubricating oil on an upper surface of a main bearing of the cylinder block, The shaft has a projecting portion projecting in the outer peripheral direction of the main shaft portion so that at least a part is immersed in the lubricating oil stored in the oil pool.

JP 2006-37716 A JP 2004-27969 A JP 2004-156512 A

  However, when the structures described in Patent Documents 1 to 3 are applied, there are the following problems.

  In the structure described in Patent Document 1, in order to lubricate the sliding portion of the piston, the lubricating oil stored in the sealed container is pumped upward by using the rotation of the main shaft and scattered from the upper end of the eccentric shaft. . Therefore, oil droplets scattered from the upper end of the eccentric shaft fall on the frame in which the bearing portion of the main shaft and the cylinder are integrally formed during operation.

  Further, a notch for assembling the rod is provided on the side surface of the cylinder. Therefore, there is a possibility that a part of the lubricating oil that has been poured onto the piston from the upper end of the eccentric shaft and lubricated between the piston and the cylinder will flow out from the notch portion onto the frame.

  In addition, a part of the oil scattered / spilled onto the frame drops from the outer edge of the frame. When the lubricating oil dropped from the frame is sucked into the cylinder through the suction muffler together with the refrigerant and mixed into the refrigeration cycle, the refrigeration capacity of the compressor may be lowered due to an increase in the oil rate.

  In addition, during low-speed operation of the compressor, the amount of lubricating oil supplied to the piston sliding surface decreases as the amount of lubricating oil scattered from the upper end of the shaft decreases, and friction loss on the piston sliding surface may increase. Occurs.

  Next, in the structure described in Patent Document 2, for lubricating between the piston and the cylinder, the lubricating oil is scattered from the upper end of the shaft, and at the same time, a part of the scattered lubricating oil is provided at the upper end of the auxiliary bearing. It leads to the piston sliding surface through the oil supply passage. Part of the lubricating oil scattered from the upper end of the shaft and part of the oil guided to the piston sliding surface pour onto the cylinder block constituting the main bearing and cylinder. Part of the lubricating oil that has poured onto the cylinder block will drip from the outer edge of the cylinder block, and if the dropped lubricating oil is sucked into the cylinder through the suction muffler together with the refrigerant and mixed into the refrigeration cycle, the oil rate will be reduced. The increase may cause a reduction in the refrigeration capacity of the compressor.

  Next, in the structure described in Patent Document 3, a part of the lubricating oil scattered from the upper end of the shaft or the lubricating oil scattered by the protruding portion provided on the shaft from the oil pool installed on the cylinder block. Some pour onto the cylinder block. Part of the lubricating oil that has poured onto the cylinder block will drip from the outer edge of the cylinder block, and if the dropped lubricating oil is sucked into the cylinder through the suction muffler together with the refrigerant and mixed into the refrigeration cycle, the oil rate will be reduced. The increase may cause a reduction in the refrigeration capacity of the compressor.

  Accordingly, an object of the present invention is to provide a hermetic compressor capable of reducing the amount of lubricating oil sucked into a cylinder and improving the lubricity of a piston sliding surface, and a refrigerator equipped with the same.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems. For example, a piston that houses an electric element and a compression element in a sealed container and reciprocates in the cylinder, and a crank connected to the piston. In a hermetic compressor including a shaft and a frame having a bearing that supports the crankshaft, a position higher than the lower end of the inner diameter of the cylinder on the side of the cylinder of the frame and lower than the upper end of the inner diameter of the cylinder It has a groove at a position.

  According to the present invention, it is possible to provide a hermetic compressor capable of reducing the amount of lubricating oil sucked into the cylinder and improving the lubricity of the piston sliding surface, and a refrigerator including the same.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1. FIG. FIG. 2 is an assembled perspective view of the hermetic compressor of FIG. 1. The longitudinal cross-sectional view of the refrigerator in which the hermetic compressor of FIG. 1 was mounted. The side view of a crankshaft. Sectional drawing of the state which assembled | attached the balance weight and the oil supply piece to the crankshaft of FIG. The perspective view of a flame | frame. The figure which looked at the frame from the horizontal direction. The figure which showed typically the condition where lubricating oil splashes from the crankshaft upper end. The perspective view of a flame | frame. Sectional drawing of the flame | frame which passes along an oil groove and an oil hole.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent.

  A first embodiment of the present invention will be described with reference to FIGS.

  First, the hermetic compressor 50 of the present embodiment will be described with reference to FIG. FIG. 1 is a longitudinal sectional view of a hermetic compressor 50 according to this embodiment.

  The hermetic compressor 50 of the present embodiment is a reciprocating compressor in which the compression element 20 and the electric element 30 are arranged vertically in the hermetic container 3 and are connected by the crankshaft 7. The compression element 20 and the electric element 30 are elastically supported in the sealed container 3.

  The electric element 30 is disposed below the frame 1 b and includes a stator 5 and a rotor 6. The rotor 6 has a structure composed of a rotor core 6a in which electromagnetic steel plates are laminated. The stator 5 is fixed to the frame 1b, and the rotor 6 is fixed to the crankshaft 7. A crankpin 7 a that is eccentric from the center of rotation is provided at the upper end of the crankshaft 7.

  The crankshaft 7 passes through the bearing portion 1a and extends upward from below the frame 1b, and the crankpin 7a is provided so as to be positioned above the frame 1b. The lower part of the crankshaft 7 is coupled to the rotor 6, and the crankshaft 7 is rotated by the power of the electric element 30. When the crankshaft 7 rotates, the crankpin 7a rotates eccentrically, and the piston 4 reciprocates.

  The compression element 20 forms a cylinder 1 that forms a cylinder chamber, a piston 4 that reciprocates in the cylinder chamber, a connecting rod 2 that drives the piston 4, a discharge valve device 40 that is assembled to the end surface of the cylinder 1, and a discharge chamber space. And a head cover 17. The cylinder 1 is integrally formed with a bearing portion 1a and a frame 1b. The piston 4 is connected to the crankpin 7a via the connecting rod 2, and reciprocates in the cylinder chamber by the eccentric rotation of the crankpin 7a. The side wall of the cylinder 1 is provided with a notch 1d. When the connecting rod 2 is assembled to the piston 4, the connecting rod 2 is inserted through the notch 1d.

  The refrigerant supplied into the cylinder 1 is compressed by the reciprocating motion of the piston 4, and the compressed gas refrigerant is sent to a discharge pipe communicating with the outside of the compressor.

  FIG. 2 is a perspective view of each component attached to the end face of the cylinder 1. On the end surface of the cylinder 1, a top packing 22, a suction valve plate 9, a valve plate 10, a packing 16, a head cover 17, a suction silencer packing 23a, a suction silencer 23, and a suction silencer fixing member 23b are arranged in this order.

  Next, the refrigerator 60 equipped with the hermetic compressor 50 will be described with reference to FIG. FIG. 3 is a longitudinal sectional view of a refrigerator 60 in which the hermetic compressor 50 of this embodiment is mounted. The refrigerator 60 includes a refrigerator compartment 62, an upper freezer compartment 63, a lower freezer compartment 64, and a vegetable compartment 65. In addition, the positional relationship of the refrigerator compartment 62, the upper freezer compartment 63, the lower freezer compartment 64, and the vegetable compartment 65 is not restricted to FIG.

  The refrigerant discharged from the hermetic compressor 50 passes through a condenser and a decompression mechanism provided in the refrigerator 60, absorbs heat in the refrigerator by the cooler 66, and returns to the compressor again. A hydrocarbon-based refrigerant such as propane or isobutane is used in the refrigeration cycle including the hermetic compressor 50, the condenser, the pressure reducing mechanism, and the cooler 66.

  Next, the oil supply structure of the hermetic compressor 50 will be described with reference to FIGS. 4 is a side view of the crankshaft 7, and FIG. 5 is a cross-sectional view of the crankshaft 7 when the balance weight 25 and the oil supply piece 21 are attached. When the crankshaft 7 rotates with the rotation of the rotor 6, centrifugal force is applied to the lubricating oil 35 in the intermediate hole 7 b, and the lubricating oil 35 rises in the intermediate hole 7 b provided at the lower end of the crankshaft 7. Furthermore, it is carried to the lower communication hole 7c.

  The lubricating oil 35 reaching the lower communication hole 7c is introduced into the spiral groove 7d shown in FIG. In the lubricating oil passage formed by the wall surface of the spiral groove 7d and the wall surface of the frame bearing portion 1a, the lubricating oil 35 is dragged to the wall surface by the effect of viscosity as the wall surface moves due to the rotation of the crankshaft 7, and the spiral groove 7d. Rise inside. At this time, the lubricating oil 35 simultaneously lubricates the bearing portion 1a.

  When the lubricating oil 35 that has risen in the spiral groove 7d reaches the upper communication hole 7e, it is conveyed again to the pin portion intermediate feed 7f shown in FIG. 5 by the centrifugal force accompanying the rotation of the crankshaft 7. The pin portion intermediate hole 7f is provided with a pin portion lower communication hole 7g, and the lubricating oil 35 reaching the pin portion lower communication hole 7g passes through the connecting rod communication hole 2a as shown in FIG. The sliding part is lubricated.

  Further, a part of the lubricating oil 35 that has reached the pin portion intermediate feed 7f further rises due to centrifugal force and scatters from the pin portion intermediate feed 7f open end at the upper end of the crankshaft 7. Part of the scattered lubricating oil 35 falls on the piston sliding surface to lubricate between the piston and the cylinder. The lubricating oil 35 scattered on the upper surface of the cylinder drops to the piston 4 side according to the inclination provided on the upper surface of the cylinder, and is used for lubrication between the piston and the cylinder.

  Next, FIG. 6 is a view of the frame 1b as viewed obliquely from above, and FIG. 7 is a view of the frame 1b as viewed from the side. An oil groove 1c is provided on the side of the cylinder 1 on the frame 1b. When the frame 1b is viewed from the lateral direction, the oil groove 1c is disposed at a position higher than the lower end of the cylinder inner diameter and lower than the upper end of the cylinder inner diameter.

  FIG. 8 is a view schematically showing the situation of the lubricating oil 35a scattered from the open end of the pin portion intermediate feed 7f. Part of the lubricating oil 35a splashed from the open end of the pin portion intermediate feed 7f is deposited on the frame 1b. The lubricating oil 35 scattered in the direction from the suction silencer 23 to the side wall of the cylinder 1 is collected in the oil groove 1c located below the lubricating oil 35.

  The oil groove 1c extends toward the cylinder 1 and is in communication with the notch 1d. Since the oil groove 1c is higher than the lower end of the cylinder inner diameter, the lubricating oil 35 collected in the oil groove 1c is guided to the inner surface of the cylinder 1 through the notch 1d. Therefore, in this structure, the lubricating oil 35 scattered in the direction from the suction silencer 23 to the side wall of the cylinder 1 and the lubricating oil 35 flowing out from the notch 1d are dropped from the outer edge of the frame 1b and sucked into the cylinder 1. The lubricating oil 35 can be used again for lubrication between the cylinder and the piston. Therefore, according to the present embodiment, the efficiency of the hermetic compressor 50 can be improved and the power consumption of the refrigerator 60 can be reduced.

  Next, a second embodiment of the present invention will be described with reference to FIGS. However, the basic configuration is the same as that of the first embodiment, and only different points will be described. FIG. 9 is a view of the frame of the present embodiment as viewed obliquely from above. FIG. 10 is a cross-sectional view of the frame of the present embodiment cut by a plane passing through the oil groove 1c and the oil hole 1e.

  An oil groove 1c is provided on the side of the cylinder 1 on the frame 1b. When the frame 1b is viewed from the lateral direction, the oil groove 1c is disposed at a position higher than the lower end of the cylinder inner diameter and lower than the upper end of the cylinder inner diameter. An oil hole 1e is provided on the side wall of the cylinder 1 so that the oil groove 1c communicates with the inside of the cylinder 1.

  The lubricating oil 35 collected in the oil groove 1c is guided to the inner surface of the cylinder 1 through the oil hole 1e. Therefore, in this structure, the lubricating oil 35 scattered in the direction from the suction silencer 23 to the side wall of the cylinder 1 and the lubricating oil 35 flowing out from the notch 1d are dropped from the outer edge of the frame 1b and sucked into the cylinder 1. The lubricating oil 35 can be used again for lubrication between the cylinder and the piston. Therefore, according to the present embodiment, the efficiency of the hermetic compressor 50 can be improved and the power consumption of the refrigerator 60 can be reduced.

DESCRIPTION OF SYMBOLS 1 Cylinder 1a Bearing part 1b Frame 1c Oil groove 1d Notch 1e Oil hole 2 Connecting rod 2a Connecting rod communication hole 3 Sealed container 4 Piston 5 Stator 6 Rotor 6a Rotor core 7 Crankshaft 7a Crank pin 7b Middle feed hole 7c Lower communication hole 7d Spiral groove 7e Upper communication hole 7f Pin part intermediate 7g Pin part lower communication hole 9 Suction valve plate 10 Valve plate 16 Packing 17 Head cover 20 Compression element 21 Oil supply piece 21a Oil supply piece tip hole 22 Top packing 23 Suction silencer 23a Suction silencer packing 23b Suction Silencer fixing member 25 Balance weight 30 Electric element 35, 35a Lubricating oil 40 Discharge valve device 50 Sealed compressor 60 Refrigerator 61 Refrigerator main body 62 Refrigeration chamber 63 Upper freezer compartment 64 Lower freezer compartment 65 Vegetable compartment 66 Cooler

Claims (6)

Sealed compression comprising a piston that houses an electric element and a compression element in a sealed container and reciprocates within the cylinder, a crankshaft connected to the piston, and a frame having a bearing that supports the crankshaft. In the machine
A hermetic compressor having a groove at a position higher than the lower end of the inner diameter of the cylinder and at a position lower than the upper end of the inner diameter of the cylinder.   The hermetic compressor according to claim 1, wherein a part of the groove extends from the frame side to the cylinder side and communicates with an inner surface of the cylinder.   The hermetic compressor according to claim 1, wherein the groove and the cylinder inner surface communicate with each other through a hole penetrating the cylinder.   The hermetic compressor according to claim 2 or 3, wherein the cylinder side wall has a notch.   The hermetic compressor according to claim 4, wherein a silencer that communicates with the cylinder and forms a silencing space is disposed above the groove. In a refrigerator having a refrigeration cycle in which a hermetic compressor, a condenser, a decompression mechanism and a cooler are connected,
The hermetic compressor includes an electric element and a compression element housed in a hermetic container, a piston that reciprocates in a cylinder, a crankshaft connected to the piston, and a frame having a bearing that supports the crankshaft. And having a groove at a position higher than the lower end of the inner diameter of the cylinder and lower than the upper end of the inner diameter of the cylinder.

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