JPS6350466Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a lubricating mechanism for a hermetic compressor. Specifically, this invention uses the rotation of the crankshaft to supply lubricating oil from an oil reservoir in a casing. , relates to an oil supply mechanism for supplying oil to lubricated parts such as bearings from an air supply passage provided in the crankshaft.

(Conventional technology) Conventionally, in hermetic compressors that control capacity by changing the rotation speed of the crankshaft using pole changes, frequency control, etc., it is necessary to ensure oil supply pressure when the crankshaft rotates at low speeds. For this purpose, the oil pump described on pages 56 to 57 of "Hermetic Refrigerator" (written by Mutsuyoshi Kabira, published by Japan Refrigeration Association) is used.

Among such pumps, for example, a pump for a two-throw crankshaft has a thrust receiver 53 and a thrust plate 54 attached to the bottom of a lower bearing part 52 that supports a crankshaft 51 with mounting screws, as shown in FIG. The thrust plate 54 has a structure in which the lower shaft end of the crankshaft 51 is supported by the thrust plate 54. And the thrust receiver 53
and the thrust plate 54 are formed with a first passage 55 that extends vertically through them, and
This first passage 55 communicates with an annular groove 56 formed in the lower shaft end of the crankshaft 51. The crankshaft 51 is also provided with a second passage 57 that communicates from the annular groove 56 to the outer periphery of the shaft 51. A cylindrical chamber 58 is provided which communicates with the passageway 57. On the other hand, in the axial center of the crankshaft 51, there is an oil supply passage 59 that communicates with oiled parts such as bearings.
is drilled. and the cylindrical chamber 5
8 and the oil supply passage 59 are in communication with each other. This is because the thrust plate 54 is provided with a through hole 60 communicating with the cylindrical chamber 58 and a through hole 61 communicating with the oil supply passage 59. On the other hand, this is achieved by forming a groove 62 on the upper surface of the thrust receiver 53 to communicate between the through holes 60 and 61. Note that the through holes 60, 6 in the upper part of the groove 62 formed in the thrust receiver 53
The parts other than 1 are covered by a thrust plate 54.

In the pump having the above structure, the rotation of the crankshaft causes the annular groove 56 and the second passage 5 to
Centrifugal force acts on the oil located inside each of 7 and the cylindrical chamber 58, and oil is supplied by this centrifugal force. At this time, the oil in this oil reservoir is
5 into the annular groove 56 and the second passage 57
and is sent to the cylindrical chamber 58. Next, from this cylindrical chamber 58, the groove 6 of the thrust receiver 53 passes through the through hole 60 of the thrust plate 54.
2, and from this groove 62 the thrust plate 5
The oil is supplied to the oil supply passage 59 of the crankshaft 51 through the through hole 61 of No. 4.

(Problems to be solved by the invention) By the way, in the above-mentioned oil supply mechanism, the oil supply pump has two members, the thrust receiver 53 and the thrust plate 54, and a plurality of mounting screws. However, having multiple parts in this way increases the cost of the device. Further, since it is necessary to perform machining on each of the above two parts, there is also a drawback that a large amount of labor is required for manufacturing them. Furthermore, using a plurality of parts as described above is complicated both in terms of parts management and assembly work.

This invention was made to solve the above-mentioned drawbacks of the conventional technology, and its purpose was to achieve the same function as the conventional technology with a smaller number of parts.
Therefore, it is low cost and easy to manufacture,
Another object of the present invention is to provide an oil supply mechanism for a hermetic compressor that does not complicate parts management or assembly work.

(Means for solving the problem) Therefore, in the oil supply mechanism of the hermetic compressor of this invention, as shown in FIG. A thrust plate 23 is disposed on the bottom wall 22 to support the lower shaft end of the crankshaft 7. The bottom wall 22 and the thrust 23 have a first passage 2 extending vertically through them at a position off the axis of the crankshaft 7.
5 is provided. On the other hand, the lower shaft end of the crankshaft 7 has a second passage 26 formed of an annular groove that communicates with the first passage 25, and a third passage 27 that communicates the second passage 26 with the outer circumference of the crankshaft 7. will be established. Further, a cylindrical chamber 28 is provided at the shaft end of the crankshaft 7 to communicate with the third passage 27, and an oil supply passage 29 is provided at the axial center of the crankshaft 7 to communicate with the lubricated part. The thrust plate 23 is provided with a fourth passage 30 that communicates the cylindrical chamber 28 with the oil supply passage 29.

(Function) As a result of the above, the lubricating oil reaches the second passage 26 via the first passage 25 and is sent to the cylindrical chamber 28 from the third passage 27 by the rotation of the crankshaft 7. Next, from this cylindrical chamber 28, a fourth
The oil is supplied to the oil supply passage 29 of the crankshaft 7 via the passage 30. In this way, in the above-mentioned oil supply mechanism, it is possible to supply oil in the same manner as in the conventional device.

Moreover, although it has the above-mentioned functions, the only component used is the thrust plate 23, and there is no need to use a thrust receiver or mounting screws as in the conventional case. Since the number of parts can be reduced in this way, the cost is lower than that of the conventional method, the manufacturing is easy, and it is also convenient for parts management.

(Example) Next, a specific example of the oil supply mechanism for a hermetic compressor of this invention will be described in detail with reference to the drawings.

In FIG. 2, 1 indicates a compressor used for refrigeration, air conditioning, etc., and this compressor 1 has a closed casing 2, and within this casing 2 is a stator 3 and a rotor 4. An electric motor 5 is housed therein. The output shaft 7a of the rotor 4 is integrally formed with the crankshaft 7.
to the pistons 9,9 through the piston rods 8,8.
is installed. The pistons 9, 9 are disposed within cylinders 10, 10, and are configured to reciprocate as the crankshaft 7 rotates. Also,
A lower end portion of the crankshaft 7 is rotatably supported by a lower bearing portion 12. The upper cover 11 and the lower cover 6 are attached within the casing 2 via a spring S.

The refrigerant gas sent from the evaporation mechanism (not shown) flows into the casing 2 through the suction port 13 opened on the upper side of the casing 2.
The air flows into the upper cover 11 through the through hole 15 of the bulge 14 formed at the top of the upper cover 11, and flows into the cylinder 10 through the suction valve 16 provided below the electric motor 5. The refrigerant gas compressed by the piston 9 in the cylinder 10 is transferred to the discharge valve 1
7, discharge passages 18 and 19, and discharge port 2.
0 to the condensing mechanism (not shown). Note that an oil reservoir 21 is provided at the bottom of the casing 2 and contains lubricating oil.

The characteristic part of this invention lies in the oil supply mechanism in the compressor 1 as described above, and this point will be explained below. First, the details are shown in FIG. 1, but a bottom wall 22 is formed on the lower bearing portion 12 that supports the crankshaft 7, and this bottom wall 22 is disposed within the oil reservoir 21. Further, a generally disc-shaped thrust plate 23 is disposed on the bottom wall 22, and the lower shaft end of the crankshaft 7 is supported by the thrust plate 23, and the lower bearing portion of the shaft 7 is supported by the thrust plate 23. The outer circumferential portion of is supported by a bearing metal 24 provided inside the lower bearing portion 12 . A through hole is formed in the bottom wall 22 and the thrust plate 23 at a position slightly apart from the axis of the crankshaft 7, and extends through the bottom wall 22 and the thrust plate 23, forming a first passage 25. On the other hand, a second passage 26 consisting of an annular groove communicating with the first passage 25 is formed at the lower shaft end of the crankshaft 7, as shown in FIGS. 1 and 3. A radially extending third passage 27 is provided nearby to communicate the second passage 26 with the outer circumference of the crankshaft 7 . Further, among the inner circumferential portion of the lower bearing portion 12,
The bearing metal 24 is not disposed in the portion facing the external opening of the third passage 27, and an annular space, ie, a cylinder, is formed between the outer circumferential surface of the crankshaft 7 and the inner circumferential surface of the lower bearing portion 12. A shaped chamber 28 is formed.

On the other hand, an oil supply passage 29 is bored in the axial center of the crankshaft 7, and the oil supply passage 29 opens at the shaft end and extends upward. It is designed to be able to supply oil to the parts to be oiled. and the cylindrical chamber 2
8 and the oil supply passage 29 communicate with each other via a fourth passage 30 provided in the thrust plate 23. That is, the thrust plate 23 has, as shown in FIGS. 1, 4, 5, and 6,
A through hole 31 is formed in the center, and an arcuate notch 3 is formed at opposing positions on the circumferential side.
2 and 32 are formed, and a groove 33 is formed on the lower surface side thereof to connect each of the above-mentioned notches 32 and 32 and the through hole 31, and a fourth passage 30 is formed by these. . In other words, the oil in the cylindrical chamber 28 is removed from the notch 3 of the thrust plate 23.
2 and 32 into the groove 33, and this groove 3
3, the oil is supplied to the oil supply passage 29 of the crankshaft 7 through the through hole 31 in the center. In addition, in Figures 4 and 5, 34, 3
Reference numeral 4 indicates a through hole formed in the thrust plate 23, and the through holes 34, 34 are for forming the first passage 25 described above.

In the oil supply mechanism described above, rotation of the crankshaft 7 causes centrifugal force to act on the oil located in the second passage 26 and the third passage 27 in the crankshaft 7 and in the cylindrical chamber 28, respectively. Refueling will be done by centrifugal force. At this time, the lubricating oil in the oil reservoir 21 reaches the annular second passage 26 from the first passage 25, and is sent to the cylindrical chamber 28 via the third passage 27. Then the fourth passage 30
, that is, through the notches 32 on the outer periphery of the thrust plate 23 to reach the groove 33, and from this groove 33 through the through hole 31 in the center, the crankshaft 7
This means that the oil is supplied to the oil supply passage 29.

Although the oil supply mechanism performs the same function as the conventional mechanism as described above, the only component used is the thrust plate 23, and there is no need to use a thrust receiver or mounting screws as in the conventional mechanism.
As a result, the oil supply mechanism can be constructed at low cost due to a reduction in the number of parts and the number of processing steps, and the small number of parts is convenient for parts management and assembly work.

(Effect of the invention) According to the oil supply mechanism of the hermetic compressor of this invention,
As mentioned above, although it has the same functions as the conventional one, there is no need to use a thrust receiver, etc., so the number of parts and the number of processing steps for the parts can be reduced.
Therefore, it becomes possible to configure the oil supply mechanism at low cost. Also, since the number of parts is reduced,
Parts management and assembly work will also become easier.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing the essential parts of an embodiment of the oil supply mechanism of the hermetic compressor of this invention, Fig. 2 is a longitudinal cross-sectional view of its overall configuration, and Fig. 3 is the shaft end surface of the crankshaft in the above. 4 is a plan view of the thrust plate in the above, FIG. 5 is a cross-sectional view taken along the line from the front figure, FIG. 6 is a cross-sectional view taken along the line from FIG. 4, and FIG. 7 is a conventional example. FIG. 2...Casing, 7...Crankshaft, 12...
...Lower bearing part, 21...Oil sump, 22...Bottom wall, 2
3... Thrust plate, 25... First passage, 2
6... Second passage, 27... Third passage, 28... Cylindrical chamber, 29... Oil supply passage, 30... Fourth
aisle.

Claims (1)

[Scope of utility model registration request] The bottom wall 22 of the lower bearing part 12 that supports the crankshaft 7 is arranged in the oil reservoir 21 at the bottom of the casing 2, and the thrust plate 23 is arranged on the bottom wall 22 to support the lower shaft end of the crankshaft 7. And so,
A first passage 25 is provided in the bottom wall 22 and the thrust plate 23 at a position outside the axis of the crankshaft 7, passing through them and extending vertically. , the first passage 2
5, and a third passage 27 that communicates the second passage 26 with the outer circumference of the crankshaft 7. A cylindrical chamber 28 is provided in communication with the oil supply passage 27 , and an oil supply passage 29 is provided in the axial center of the crankshaft 7 that communicates with the oiled part. 4th to communicate with
An oil supply mechanism for a hermetic compressor, characterized in that a passage 30 is provided.