JP3600694B2 - Rotary compressor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary compressor used for a refrigerator or an air conditioner.
[0002]
[Prior art]
Rotary compressors are often used in refrigerators and refrigerators because of their compactness and simple structure. The compression mechanism such as vanes and rollers, which are the main components of the compressor, are described in, for example, Kawahira, Hermetic Refrigerator (1993), page 14, FIG. 6.1.
[0003]
Hereinafter, the configuration and operation of the conventional rotary compressor will be described with reference to FIG. The compression mechanism in the closed container includes a crankshaft 1 having an eccentric portion 9, a bearing supporting the crankshaft 1, a cylinder 2, a vane 3, and a roller 4 that rotates eccentrically in the cylinder 2, and has a cylindrical end. The vane 3 reciprocates in the vane groove 5 of the cylinder 2, and its tip is pressed against the outer peripheral surface of the roller 4 by the spring force of the spring 6 and the force due to the pressure difference between the inside and outside of the cylinder 2. It slides in contact with the outer peripheral portion of the roller 4 and divides the inside of the cylinder 2 into a suction chamber 7 and a discharge chamber 8. O is the center of the cylinder 2 and the crankshaft 1, and the crankshaft 1 has an eccentric portion 9 centered on P eccentric from the center O by e. The crankshaft 1 rotates about O, and the eccentric part 9 integrated with the crankshaft rotates eccentrically. A roller 4 is fitted to the eccentric portion 9, and the crankshaft 1 is rotated by an electric motor so that the roller 4 revolves in the cylinder 2, thereby sucking the refrigerant gas from the suction port 10 and compressing the refrigerant gas into the discharge port 11. Send while. The refrigerant gas at the discharge port 11 is sent to the refrigeration cycle side through the discharge valve 12, and returns to the suction port 10 of the compressor again through the condenser, the expansion valve, and the evaporator.
[0004]
In the above configuration, at the contact portion between the roller 4 and the tip of the vane 3, the oil mainly contained in the suction refrigerant, the gap between the vane 3 and the vane groove 5 provided in the cylinder 2, or the end face of the roller 4 Oil film was formed by the oil passing through the gap due to the pressure difference.
[0005]
In addition, the said sealed container, the bearing which supports the crankshaft 1, and the electric motor are not illustrated.
[0006]
However, in the above-described conventional configuration, the tip of the vane 3 is a cylindrical curved surface, and the outer peripheral surface of the roller 4 is also a cylindrical surface, so that the contact state between the vane 3 and the roller 4 is equivalently equivalent to a small cylinder and a large cylinder. It comes into contact with the cylinder. Therefore, the contact state is a line contact state, the contact area is small, the load per unit area, that is, the contact stress is large, and the contact sliding condition between the vane 3 and the roller 4 is severe.
[0007]
The number of rotations of the roller 4 is also determined by the difference between the sliding resistance between the inner peripheral surface of the roller 4 and the eccentric portion 9 and the sliding resistance between the outer peripheral surface of the roller 4 and the tip of the vane 3. The number of rotations of the roller 4 is very unstable. Generally, when the rotation speed of the crankshaft 1 is operated at 3500 rpm, the number of rotations of the roller is about several tens to several hundreds rpm. For this reason, the sliding speed of the leading end of the vane 3 and the sliding surface of the roller 4 varies depending on the conditions, resulting in unstable sliding.
[0008]
Further, when an alternative refrigerant containing no chlorine, for example, R134a, is used, there is a problem that the lubricating property is remarkably reduced when the oil film of the sliding portion is broken. There is a problem that abrasion tends to occur between the vane 3 and the tip of the vane 3.
[0009]
In order to solve this problem, for example, Japanese Unexamined Patent Publication No. 7-259767 discloses that the inside of the crankshaft 13 and its eccentric portion 14 is penetrated from the oil supply passage 15 to the outer diameter of the eccentric portion 14 as shown in FIG. A lateral hole 16, an oil groove 17 provided on the outer diameter of the eccentric portion 14 in communication with the lateral hole 16, an outer peripheral groove 19 provided on the outer periphery of the roller 18, and a hole penetrating the outer peripheral groove 19 from the roller inner diameter. 20 and an oil groove 21 provided at the deepest portion of the outer peripheral groove 19 in parallel with the outer peripheral groove 19 are disclosed.
[0010]
[Problems to be solved by the invention]
However, in this configuration, the contact between the roller 18 and the vane 22 is a surface contact, and the rotation of the roller 18 is also regulated, so that stable sliding conditions can be realized. Since the hole 20 penetrating from the inner diameter of the roller communicates with the lateral hole 16 provided so as to communicate from the oil supply passage 15 to the outer diameter of the eccentric portion only once per rotation, the oil is intermittently supplied and sufficient oil is not supplied. Further, there is a disadvantage that the amount of oil supplied to the sliding portion between the eccentric portion 14 and the inner periphery of the roller 18 decreases.
[0011]
In consideration of the above conventional problems, the present invention reduces the load on the sliding portion between the vane and the roller, and supplies a sufficient amount of oil to the sliding portion between the vane and the roller, thereby achieving high reliability and long life. It is an object of the present invention to provide a simplified rotary compressor.
[0012]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a compression mechanism including a crankshaft having a bearing portion and an eccentric portion, a cylinder, a vane having an R-shaped tip, and a tubular roller revolving in the cylinder. A motor section for driving a mechanism section is provided in a closed container, a concave groove section is provided on the outer periphery of the roller, where the vane tip is disposed in contact with the roller section, and a first oil groove is provided on an end face of the roller, The roller is provided with an oil hole communicating the first oil groove and the concave groove portion of the roller.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.
[0014]
(Embodiment 1)
FIG. 1 is a sectional view of a compression mechanism section of a rotary compressor according to one embodiment of the present invention, and FIG. 2 is a perspective view of a main part thereof. 1 and 2, the compression mechanism includes a crankshaft 31 having a crankpin 32, a cylinder 33, a vane 34 having an R-shaped tip, and a roller 35 revolving in the cylinder 33. A concave groove 36 is formed, and the tip of the vane 34 is disposed in contact with the groove. Further, an oil groove 37 and a lateral groove 40 are provided on an end surface of the roller 35. The oil supply hole 39 penetrates through the inside of the crankshaft 31 and the crankpin 32 from the oil supply passage 38 to the outer periphery of the crankpin 32, and the oil guided from the oil supply passage 38 to the outer periphery of the crankpin 32 is applied to the end face of the roller 35. It is configured to be guided to the oil groove 37 by a gap between the upper and lower cylinder side walls (not shown) and the lateral groove 40. Further, a vertical oil hole 41 and a horizontal oil hole 42 are provided so as to communicate the oil groove 37 with the concave groove 36 of the roller 35.
[0015]
Next, the operation of the refueling mechanism in the present embodiment will be described. After the oil is guided from the oil supply passage 38 to the sliding portion of the crank pin 32 through the oil supply hole 39, the oil is provided in the gap between the end surface of the roller 35 and the upper and lower cylinder side walls (not shown) and the end surface of the roller 35. The oil is guided to the oil groove 37 via the horizontal groove 40 and further to the concave groove 36 of the roller 35 via the vertical oil hole 41 and the horizontal oil hole 42.
[0016]
As described above, in the first embodiment, a sufficient amount of oil can be supplied almost continuously to the sliding portion of the vane and the roller where the sliding conditions are severe and wear is likely to occur, the oil film is sufficiently formed, and the sliding is performed. An object of the present invention is to provide a rotary compressor that can reduce a load and has a long life and high reliability.
[0017]
(Embodiment 2)
FIG. 3 is a perspective view of a main part of the rotary compressor according to one embodiment of the present invention. In FIG. 3, the oil groove 43 is provided in the groove 36 of the roller 35 along a direction not parallel to the groove 36. Other components are the same as those shown in FIGS.
[0018]
Next, the operation of the refueling mechanism in the present embodiment will be described. In the rotary compressor configured as in the present embodiment, after the oil is guided from the oil supply passage 38 to the sliding portion of the crank pin 32 through the oil supply hole 39, the end face of the roller 35 and the upper and lower cylinder side walls ( (Not shown) and the oil groove 37 through a horizontal groove 40 provided on the end face of the roller 35, and further into a concave groove 36 of the roller 35 through a vertical oil hole 41 and a horizontal oil hole 42. It is guided almost continuously to the provided oil groove 43.
[0019]
As described above, in the second embodiment, a sufficient amount of oil can be supplied to almost the entire sliding portion between the vane 34 and the roller 35, the oil film can be sufficiently formed, and the sliding load can be reduced. It is possible to provide a rotary compressor having high reliability and a long life.
[0020]
(Embodiment 3)
FIG. 4 is a perspective view of a main part of a rotary compressor according to one embodiment of the present invention. In FIG. 4, a flat surface 44 is formed on the top of the tip R of the vane 34. Other components are the same as those shown in FIGS.
[0021]
Next, the operation of the refueling mechanism in the present embodiment will be described. In the rotary compressor configured as in the present embodiment, after the oil is guided from the oil supply passage 38 to the sliding portion of the crank pin 32 through the oil supply hole 39, the end face of the roller 35 and the upper and lower cylinder side walls ( (Not shown), and the oil groove 37 is guided to the oil groove 37 via a horizontal groove 40 provided on the end face of the roller 35, and is further connected to the concave groove 36 of the roller 35 and the vane via a vertical oil hole 41 and a horizontal oil hole 42. It is guided almost continuously to the gap between the flat surfaces 44 provided at the top of the R-shape of the tip 34.
[0022]
As described above, in the third embodiment, it is possible to supply a sufficient amount of oil over substantially the entire sliding portion between the vane 34 and the roller 35, to form an oil film sufficiently, to reduce a sliding load, It is possible to provide a rotary compressor having high reliability and a long life.
[0023]
(Embodiment 4)
FIG. 5 is a perspective view of a main part of a rotary compressor according to one embodiment of the present invention. In FIG. 5, an oil groove 45 is provided in the end R-shaped portion of the vane 34. Other components are the same as those shown in FIGS.
[0024]
Next, the operation of the refueling mechanism in the present embodiment will be described. In the rotary compressor configured as in the present embodiment, after the oil is guided from the oil supply passage 38 to the sliding portion of the crank pin 32 through the oil supply hole 39, the end face of the roller 35 and the upper and lower cylinder side walls ( (Not shown), and the oil groove 37 is guided to the oil groove 37 via a horizontal groove 40 provided on the end face of the roller 35, and is further connected to the concave groove 36 of the roller 35 and the vane via a vertical oil hole 41 and a horizontal oil hole 42. It is guided almost continuously to an oil groove 45 provided in the R-shaped portion of the tip 34.
[0025]
As described above, in the fourth embodiment, a sufficient amount of oil can be supplied over substantially the entire sliding portion between the vane 34 and the roller 35, the oil film can be sufficiently formed, and the sliding load can be reduced. It is possible to provide a rotary compressor having high reliability and a long life.
[0026]
The oil groove 37 is not limited to one end face of the roller 35 but may be provided on both upper and lower end faces.
[0027]
The number of the lateral grooves 40 is not limited to one, and a plurality of lateral grooves may be provided.
[0028]
The number of vertical oil holes 41 and the number of horizontal oil holes 42 are not limited to one, and a plurality of oil holes may be provided.
[0029]
Further, the operation may be performed using a refrigerant containing no chlorine, for example, HFC134a.
[0030]
The oil groove 37 is an example of the first oil groove of the present invention, the oil groove 43 is an example of the second oil groove of the present invention, and the oil groove 45 is an example of the third oil groove of the present invention.
[0031]
The crank pin 32 is an example of the eccentric part of the present invention.
[0032]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a rotary compressor having a long life and high reliability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a compression mechanism of a rotary compressor according to Embodiments 1, 2, 3, and 4 of the present invention. FIG. 2 is Embodiment 1 of the present invention; FIG. 3 is a main part perspective view of a rotary compressor according to Embodiments 2, 3, and 4. FIG. 3 is a main part perspective view of a rotary compressor according to Embodiment 2 of the present invention. FIG. 5 is a perspective view of a main part of a rotary compressor according to a third embodiment. FIG. 5 is a perspective view of a main part of a rotary compressor according to a fourth embodiment of the present invention. 7 is a sectional view of a compression mechanism of a conventional rotary compressor.
31 crankshaft 32 crankpin 33 cylinder 34 vane 35 roller 36 concave groove 37 first oil groove 41 vertical oil hole 42 horizontal oil hole 40 horizontal groove

Claims (10)

A hermetically sealed container including a crankshaft having a bearing portion and an eccentric portion, a cylinder, a vane having an R-shaped tip, a compression mechanism portion having a tubular roller revolving in the cylinder, and an electric motor portion driving the compression mechanism portion. Provided therein, a concave groove portion on which the tip of the vane abuts is provided on the outer periphery of the roller, a first oil groove is provided on an end surface of the roller, and the first oil groove is provided on the roller. An oil hole communicating with the concave groove portion of the roller is provided. 2. The roller having a second oil groove in the concave groove portion of the roller, wherein the oil hole is an oil hole that communicates the first oil groove and the second oil groove. 3. The rotary compressor according to any one of the preceding claims. The vane tip has a flat surface in an R-shaped portion, and the oil hole is configured when the first oil groove and the vane tip are disposed in contact with the concave groove portion of the roller. 2. The rotary compressor according to claim 1, wherein the rotary compressor is an oil hole that communicates a gap between the concave groove portion of the roller and a flat surface of an R-shaped portion at the tip of the vane. 3. A third oil groove is provided at an R-shaped portion at the tip of the vane, and the oil hole is an oil hole that communicates the first oil groove and the third oil groove. Item 4. The rotary compressor according to Item 1. The rotary compressor according to claim 2, wherein the second oil groove is an oil groove provided along a direction that is not parallel to the concave groove portion. The rotary compressor according to any one of claims 1 to 4, wherein the first oil groove is provided on both upper and lower end surfaces of the roller. 5. The rotary compressor according to claim 1, wherein a plurality of oil holes are provided. The rotary compressor according to any one of claims 1 to 4, wherein a lateral groove from the first oil groove to an inner periphery of the roller is provided on an end surface of the roller. The rotary compressor according to claim 8 , wherein the lateral groove is plural. 5. The rotary compressor according to claim 1, wherein the rotary compressor is operated using a refrigerant containing no chlorine.

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