JPH0942154A - Enclosed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make improvements in reliability while preventing wear in a sliding part by securing a stable lubrication, not resting on operational frequency, pertaining to the lubrication of this enclosed compressor. SOLUTION: This enclosed compressor is composed of a hermetically sealed vessel, oil stored in a bottom part of this vessel, a crankshaft 16 whose lower end is dipped in the oil, and with an eccentric part 17, an oil feed passage 18 passing through the inside of this crankshaft 16 and opening to a lower end of this crankshaft 16, an eccentric part oil feeding hole 19 whose one end is opened to an upper end of the eccentric part 17, and the other end is interconnected to the oil feeding passage 18, and having a shaft center tilted to the shaft center of the crankshaft 16, an oil-disperse pipe 20 inserted into the eccentric oil feeding hole 19 free of sliding motion in the axial direction, and an oil-disperse hole 21 bored in this oil 20, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in a refrigerating machine or the like.

[0002]

2. Description of the Related Art A hermetic compressor used in a refrigerator or the like has an electric compression element housed in a hermetic container and cannot be maintained or repaired in the hermetic container. It is rare. In particular, it is necessary to maintain stable and high reliability for a long period of time without causing poor lubrication in the sliding portion.

[0003] Therefore, there has been proposed a method of sending oil to a sliding portion to improve reliability in order to reduce poor lubrication. As a method of supplying oil to the sliding parts of the piston, piston pin, connecting rod, etc., for example, a hermetic compressor as disclosed in Japanese Utility Model Publication No. 47-14292 and Japanese Utility Model Publication No. 52-92414 is used. is there.

An example of the conventional hermetic compressor described above will be described below with reference to the drawings.

FIG. 5 is a sectional view showing a conventional hermetic compressor. In FIG. 5, 1 is a closed container, and 2 is oil stored in the bottom of the closed container 1. Reference numeral 3 is an electric motor, 4 is a crankshaft whose lower end is soaked in oil 2, and is rotated by the electric motor 3, and 5 is a crankshaft which passes through the inside of the crankshaft 4.
Is an oil supply passage that connects the upper end and the lower end of the. Reference numeral 6 denotes a bearing that supports the crankshaft 4, and reference numeral 7 denotes an eccentric portion provided on the upper portion of the crankshaft 4.

8 is an oil spray pipe vertically inserted and fixed to the upper end of the oil supply passage, 9 is a connecting rod, 10 is a large end hole in which one end of the connecting rod 9 is inserted, and an eccentric portion 7 is inserted, and 11 is another connecting rod 9. It is a small end hole provided at the end.

12 is a piston pin, 13 is a cylinder,
Reference numeral 14 is a piston slidably inserted in the cylinder 13 and integrated with the connecting rod 9 by the piston pin 12, and reference numeral 15 is a discharge pipe for guiding the compressed refrigerant gas to the outside of the closed container 1.

The operation of the hermetic compressor constructed as described above will be described below. As the crankshaft 4 rotates, oil pressure is generated in the oil 2 in the oil supply passage 5,
The oil 2 rises in the oil supply passage 5. The sucked oil 2 lubricates the bearing 6 and the eccentric portion 7, and is blown out from the oil spray pipe inserted in the eccentric portion, and is blown in the circumferential direction by the centrifugal force.

A part of the splashed oil is the piston 14,
The cylinder 13, the piston pin 12, and the small end hole 11 of the connecting rod 9 are sprinkled to lubricate and cool the sliding parts thereof. Further, the other oil that has been blown off is sprinkled on the discharge pipe 17 and the closed container 1. The oil 2 splashed on the inner wall surface of the closed container 1 is cooled by exchanging heat with the outside through the closed container 1.

As described above, the height of the tip of the oil spray pipe 8 is adjusted so that the oil blown out from the oil spray pipe can be efficiently splashed on the piston 14, the piston pin 12, and the like.
These actions prevent abrasion and seizure of the sliding parts,
High reliability is ensured.

[0011]

However, in the above-described conventional configuration, when the operating frequency changes in two steps such as 50 Hz and 60 Hz, or when operating over a wide range of frequencies such as inverter operation, there is a problem. The oil 2 blown out from the oil pipe 8 does not efficiently hit the parts such as the piston 14 and the piston pin 12 that require oil supply and cooling.

For example, when the operating frequency becomes low, the oil spray pipe 8
The speed of the oil 2 blown from
Does not fly far, and hits below the portion of the piston 14 or the like where oil supply and cooling are desired. Further, as the operating frequency increases, the speed of the oil 2 that is blown from the oil spray pipe 8 increases, and the oil 2 jumps too far and hits the portion above the portion that is desired to be refueled and cooled.

As a result, there is a possibility that lubrication and cooling of the piston 14, the piston pin 12 and the like will be insufficient, which will adversely affect the sliding portion to cause poor lubrication and reduce reliability.

The present invention solves the problems of the prior art so that even if the operating frequency changes, the oil spattered from the oil spray pipe can always efficiently hit the piston, piston pin, and other parts that require lubrication and cooling. In addition, it is an object of the present invention to provide a highly reliable hermetic compressor that prevents lubrication failure of the sliding portion regardless of the operating frequency.

[0015]

To achieve this object, a hermetic compressor according to the present invention comprises a hermetic container, an oil stored in the bottom of the hermetic container, and a crank having an eccentric portion whose lower end is immersed in the oil. Through the shaft and the crankshaft,
An oil supply passage opening to the lower end of the crankshaft, and an eccentric portion having one end opening to the upper end of the eccentric portion and the other end communicating with the oil supply passage and having an axis inclined with respect to the axis of the crankshaft. An oil supply hole, an oil distribution pipe slidably inserted in the axial direction of the eccentric part oil supply hole, and an oil distribution hole formed in the oil distribution pipe.

Further, the closed container, the oil stored in the bottom of the closed container, the lower end immersed in the oil, the crankshaft having an eccentric part, and the crankshaft passing through the crankshaft, the upper end and the lower end of the crankshaft are communicated with each other. And an oil spray pipe made of a deformable elastic material that is inserted and fixed to the upper end of the oil supply passage.

[0017]

In the hermetic compressor of the present invention, one end is opened at the upper end of the eccentric portion, the other end is communicated with the oil supply passage, and an eccentric portion oil supply hole having an axis inclined with respect to the axis of the crankshaft is provided. Since the oil spray pipe slidably inserted in the axial direction of the eccentric part oil supply hole and the oil spray hole opened in the oil spray pipe are provided, the operating frequency is 2
In the case of a stage, for example, when sharing 50 Hz and 60 Hz, the centrifugal force acting on the oil spray pipe is small in low frequency operation, and the oil spray pipe is located at the bottom of the slidable range, and the oil spray hole does not open to the outside. , Oil is splashed from the tip of the oil spray pipe.

Further, in high frequency operation, the centrifugal force acting on the oil spray pipe is large, and the oil spray pipe is located at the uppermost part of the slidable range, and the oil spray hole opens to the outside. Be done.

Due to these actions, the position where the oil jumps out from the oil spray pipe is high in the low frequency operation and becomes low in the high frequency operation, which is offset by the difference in the speed of the oil to be skipped due to the difference in the frequency, so that it is always possible at both frequencies. Oil can be effectively splashed on the same position of the sliding portion such as the piston. Therefore, at both frequencies, poor lubrication of the sliding portion can be prevented and high reliability can be obtained.

Further, it is inserted and fixed at the upper end of the oil supply passage,
Since the oil diffuser pipe made of a deformable elastic material is installed, the centrifugal force acting on the oil diffuser pipe increases as the operating frequency increases, and the bending direction of the oil diffuser pipe increases, so the position of the tip of the oil diffuser pipe is continuous. It becomes low.

Due to this action, the position where the oil jumps out from the oil spray pipe becomes lower as the operating frequency becomes higher, which is offset by the increase in the speed of the oil that is blown due to the increase in the frequency, not only when the operating frequency is in two stages. Even in a wide range of operating frequencies such as inverter operation, oil can always be effectively splashed to the same position of the sliding portion such as the piston. Therefore, even in the case where the operating frequency changes continuously over a wide range of operating frequencies, it is possible to prevent poor lubrication of the sliding portion and obtain high reliability.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the hermetic compressor of the present invention will be described below with reference to the drawings. The same components as those of the related art are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a sectional view of a main portion of a crankshaft at a low operating frequency of a hermetic compressor according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a crankshaft main part at a high operating frequency of the hermetic compressor according to the first embodiment of the present invention.

In FIGS. 1 and 2, reference numeral 16 is a crankshaft having an eccentric portion 17, 18 is an oil supply passage which passes through the crankshaft 16 and opens at the lower end of the crankshaft 16,
Reference numeral 19 is an eccentric part oil supply hole having one end opened to the upper end of the eccentric part 17 and the other end communicating with the oil supply passage 18 and having an axis inclined with respect to the axis of the crankshaft 16.

Reference numeral 20 is an oil spray pipe slidably inserted in the eccentric portion oil supply hole 19 in the axial direction, and reference numeral 21 is an oil spray hole formed in the oil spray pipe 20. Reference numeral 22 is a pressing plate fixed to the upper surface of the eccentric portion 17 so that the oil spray pipe 20 does not come out of the eccentric portion oil supply hole 19.

The operation of the hermetic compressor having the above structure will be described below. When the operating frequency is in two stages, for example, when both 50 Hz and 60 Hz are used, the centrifugal force acting on the oil spray pipe 20 is small in low frequency operation, and the oil spray pipe 20 is the lowest in the slidable range as shown in FIG. The oil 2 is blown from the tip of the oil pipe 20 because the oil hole 21 does not open to the outside.

In high frequency operation, the centrifugal force acting on the oil spray pipe 20 is large, and the oil spray pipe 20 is located at the uppermost part of the slidable range as shown in FIG. 2, and the oil spray hole 21 is opened to the outside. Therefore, the oil 2 is blown out from the oil spray hole 21.

Due to these actions, the position where the oil 2 jumps out from the oil spray pipe is high in low frequency operation and low in high frequency operation. On the other hand, since the speed of the oil 2 to be blown is low in low frequency operation and high in high frequency operation, it is offset by the difference in the height at which the oil 2 is blown as described above, and the sliding portion of the piston 14 or the like is constantly operated at both frequencies. Oil 2 can be effectively splashed at the same position. Therefore, at both frequencies, poor lubrication of the sliding portion can be prevented and high reliability can be obtained.

As described above, the hermetic compressor of this embodiment is
Closed container 1 and oil 2 stored at the bottom of closed container 1,
The lower end is immersed in the oil 2 and has a crankshaft 16 having an eccentric portion 17, an oil supply passage 18 passing through the crankshaft 16 and opening at the lower end of the crankshaft 16, one end opening at the upper end of the eccentric portion 17, and the other end. Is connected to the oil supply passage 18 and has an eccentric portion oil supply hole 1 having an axis inclined with respect to the axis of the crankshaft 16.
9, an oil spray pipe 20 slidably inserted in the axial direction of the eccentric part oil supply hole 19, and an oil spray hole 21 formed in the oil spray pipe 20, the operating frequency is in two stages. If, for example, both 50 Hz and 60 Hz are used, the centrifugal force acting on the oil spray pipe 20 is small in low frequency operation and the oil spray pipe 2
0 is located at the bottom of the slidable range, and the oil spray hole 2
Since 1 does not open to the outside, the oil 2 is splashed from the tip of the oil spray pipe 20.

In high frequency operation, the centrifugal force acting on the oil spray pipe 20 is large, and the oil spray pipe 20 is located at the uppermost part of the slidable range, and the oil spray hole 21 opens to the outside, so that the oil 2 is scattered. It is blown from the oil hole.

Due to these actions, the position where the oil 2 is blown is high in the low frequency operation and becomes low in the high frequency operation, which is offset by the difference in the speed of the oil 2 to be blown due to the difference in the frequency, so that the oil 2 is always kept at both frequencies. The oil 2 can be effectively splashed at the same position of the sliding portion such as the piston 14. Therefore, at both frequencies, poor lubrication of the sliding portion can be prevented and high reliability can be obtained.

Next, a second embodiment of the hermetic compressor according to the present invention will be described with reference to the drawings. In addition,
The same components as those of the conventional example and the first example are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 3 is a cross-sectional view of a crankshaft main part at a low operating frequency of a hermetic compressor according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view of a crankshaft main part at a high operating frequency of a hermetic compressor according to a second embodiment of the present invention.

In FIGS. 3 and 4, reference numeral 23 denotes an oil spray pipe which is inserted and fixed to the upper end of the oil supply passage and is made of a deformable elastic material.

The operation of the hermetic compressor constructed as described above will be described below. When the operating frequency changes over a wide range, the centrifugal force acting on the oil spray pipe 23 increases as the operating frequency increases, and the bending direction of the oil spray pipe 23 increases, so the position of the tip of the oil spray pipe 23 continuously decreases. Become.

Due to this action, the position where the oil 2 jumps out from the oil spray pipe becomes lower as the operating frequency becomes higher. on the other hand,
The higher the operating frequency, the higher the speed of the oil 2 that is blown off, which is offset by the decrease in the height at which the oil 2 jumps out of the oil spray pipe described above, and it is effective at the same position of the sliding portion such as the piston 14 at all times. Oil 2 can be splashed.

Therefore, not only in the case where the operating frequency is two stages such as 50 and 60 Hz, but also in the case where the operating frequency is in a wide range like the inverter operation and the frequency is continuously changed, the lubrication failure of the sliding portion is caused. And high reliability is obtained.

As described above, the hermetic compressor of this embodiment is
Closed container 1 and oil 2 stored at the bottom of closed container 1,
The lower end is immersed in the oil 2, the crankshaft 4 having the eccentric portion 7, the oil supply passage 5 that passes through the crankshaft 4 and communicates the upper end and the lower end of the crankshaft 4, and is inserted and fixed in the upper end of the oil supply passage 5. Since the oil spray pipe 23 made of a deformable elastic material is provided, the centrifugal force acting on the oil spray pipe 23 increases as the operating frequency increases, and the bending direction of the oil spray pipe 23 increases. The position of the tip of the is continuously lowered.

Due to this action, the position where the oil 2 jumps out from the oil spray pipe becomes lower as the operating frequency becomes higher, which is offset by the increase in the speed of the oil 2 to be blown due to the increase in the frequency, and only when the operating frequency is in two stages. Of course, even in a wide operating frequency such as the inverter operation, the oil 2 can be effectively splashed to the same position of the sliding portion such as the piston 14 at all times.

Therefore, even in the case where the operating frequency changes continuously over a wide range of operating frequencies, it is possible to prevent the lubrication failure of the sliding portion and obtain high reliability.

[0041]

As described above, according to the present invention, the closed container, the oil stored in the bottom of the closed container, the lower end of which is immersed in the oil, the crankshaft having the eccentric part, and the inside of the crankshaft, An oil supply passage opening to the lower end of the crankshaft, and an eccentric portion having one end opening to the upper end of the eccentric portion and the other end communicating with the oil supply passage and having an axis inclined with respect to the axis of the crankshaft. In the case where the operating frequency is in two stages, it is composed of an oil supply hole, an oil spray pipe slidably inserted in the axial direction of the eccentric part oil supply hole, and an oil spray hole opened in the oil spray pipe. In the case of 50 Hz and 60 Hz, for example, the position where the oil jumps out from the oil spray pipe is high in low frequency operation and low in high frequency operation, which is offset by the difference in the speed of the oil that is skipped due to the difference in frequency. To Effectively oil at the same position of the sliding portion always piston or the like have can the splashing. Therefore, at both frequencies, poor lubrication of the sliding portion can be prevented and high reliability can be obtained.

Further, the closed container, the oil stored in the bottom of the closed container, the lower end of the crank shaft having the eccentric portion immersed in the oil, the crank shaft passing through the crank shaft, and the upper end and the lower end of the crank shaft are communicated with each other. The oil supply passage and the oil spray pipe that is inserted and fixed to the upper end of the oil supply passage and is made of a deformable elastic material, the bending of the oil spray pipe increases as the operating frequency increases, and the oil The position of jumping out of the oil spray pipe becomes lower as the operating frequency becomes higher. This is offset by the increase in the speed of the oil that is blown due to the increase in the frequency, and not only when the operating frequency is in two stages, but also when operating in a wide range such as the inverter operation, the sliding parts such as the piston are always the same. You can effectively splash oil on the position.

Therefore, even in the case where the operating frequency changes continuously over a wide range of operating frequencies, the lubrication failure of the sliding portion can be prevented and high reliability can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a crankshaft main part of a first embodiment of a hermetic compressor according to the present invention at a low operating frequency.

FIG. 2 is a cross-sectional view of a crankshaft main part at a high operating frequency of the first embodiment of the hermetic compressor according to the present invention.

FIG. 3 is a cross-sectional view of the crankshaft main part at a low operating frequency of the second embodiment of the hermetic compressor according to the present invention.

FIG. 4 is a cross-sectional view of a crankshaft main part at a high operating frequency of a second embodiment of the hermetic compressor according to the present invention.

FIG. 5 is a sectional view of a conventional hermetic compressor.

[Explanation of symbols]

 1 Airtight container 2 Oil 4 Crankshaft 5 Oil supply passage 7 Eccentric part 16 Crankshaft 17 Eccentric part 18 Oil supply passage 19 Eccentric part oil supply hole 20 Oil spray pipe 21 Oil spray hole 23 Oil spray pipe

Claims (2)

[Claims] 1. An airtight container, oil stored in the bottom of the airtight container, a crankshaft having a lower end soaked in the oil and having an eccentric part, and a fuel supply which passes through the crankshaft and opens at the lower end of the crankshaft. A passage, an eccentric part oil supply hole having one end opened to the upper end of the eccentric part and the other end communicating with the oil supply passage, and having an axis inclined with respect to the axis of the crankshaft, and the eccentric part oil supply hole A hermetic compressor comprising an oil spray pipe slidably inserted in the axial direction and an oil spray hole formed in the oil spray pipe. 2. An airtight container, oil stored in the bottom of the airtight container, a crankshaft having a lower end immersed in the oil and having an eccentric part, and a crankshaft passing through the crankshaft to communicate the upper end and the lower end of the crankshaft. A hermetic compressor including an oil supply passage and an oil spray pipe made of a deformable elastic material that is inserted and fixed to an upper end portion of the oil supply passage.