JPH03536Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is an oil supply structure for a hermetic compressor, specifically, a compression element and a crankshaft that drives the compression element are placed in a hermetic casing with an oil reservoir at the bottom. The crankshaft is supported by a lower bearing tube which protrudes into the oil sump and whose lower surface is closed by a thrust plate and a holder, and which extends in the axial direction and connects the thrust plate and the holder to the crankshaft. a first passage communicating with the annular passage and opening to the outer circumferential surface of the crankshaft; and a first passage extending in the axial direction, with one end connected to the lower end of the crankshaft and the other end slidably connected to the oil sump. an annular groove opposite to the first passage is formed on the inner surface of the bearing hole of the bearing, and a second passage is formed in the bearing through the thrust plate. The present invention relates to an oil supply structure for a hermetic compressor in which a communication groove is formed to connect two passages.

(Prior art) Conventionally, the oil supply structure of this type of compressor was
As described in Japanese Patent No. 59-58782 and as shown in FIG. A second passage 12 is formed in the axial direction from the lower end surface to the sliding part of the compression element, and the thrust plate 10 and the receiver 11 are connected to the outer periphery of the second passage 12 at the lower end of the crankshaft 7. A first passage 14 is provided at the lower end of the crankshaft 7 and extends radially outward from the annular passage 13. An annular groove 15 is formed on the inner surface of the bearing hole of the lower bearing tube 9 facing each other, and
1 is formed with a communication groove 16 that connects the annular groove 15 and the lower end surface of the second passage 12 via the thrust plate 10.

Thus, during operation of the compressor, the lubricating oil that has reached the annular passage 13 from the oil reservoir 1a of the casing (not shown) via the receiver 11 and thrust plate 10 is used to drive the rotation of the crankshaft 7. Accordingly, the centrifugal force acting on the radial portions (not shown) of the first passage 14 and the second passage 12 leads to the annular groove 15 of the bearing sleeve 9, and from the annular groove 15 through the thrust plate 10. It flows into the communication groove 16 of the receiving money 11, and further, the communication groove 16
The oil is supplied to the sliding parts of each bearing part of the compression element through the second passage 12 of the crankshaft 7, and the sliding parts are lubricated by such an oil supply path. I do what I do.

(Problems to be Solved by the Invention) However, in the conventional oil supply structure, when dirt is mixed in the lubricating oil passing through the oil supply path as described above, no means is adopted to remove this dirt. Therefore, along with the lubricating oil, dirt and the like may be supplied to the sliding parts of the compression element, and in particular, the oil supply path may be contaminated with cutting debris generated during machining of the crankshaft 7, the compression element, etc. In some cases, this cutting waste may be supplied to the sliding portion, causing damage to the sliding portion.

The present invention has been devised in view of the above-mentioned problems, and by providing a means for removing dirt and the like in the oil supply path, dirt and the like that enter the oil supply path can be removed, and the sliding portion can be cleaned from dirt and the like. This is to ensure that the sliding parts are lubricated.

(Means for Solving the Problems) The configuration of the present invention is as shown in FIGS. 1 to 5, and the communication position of the first passage 14 in the annular groove 15 formed in the lower bearing sleeve 9 A plurality of recessed portions 17 recessed outward in the radial direction are formed between the connecting position of the communication groove 16 and the thrust plate 10 is formed in a portion of the receiver 11 corresponding to the recessed portions 17. A plurality of dirt storage holes 18 are formed to communicate with the recessed portion 17 via the dirt hole 18.

(Function) When lubricating oil is supplied from the oil reservoir 1a at the bottom of the casing to the sliding portion of the compression element 6, dirt and the like mixed in the lubricating oil are removed from the recess 17 of the annular groove 15 to the thrust plate 10. through the dirt collecting hole 18 of the receiver 11, and the dirt collecting hole 1
8 to collect and remove the above-mentioned garbage.

(Example) Fig. 5 shows a compressor implementing the oil supply structure of the present invention, in which a motor 2 is arranged at an upper position inside a closed casing 1 having an oil reservoir 1a at the bottom, and
A compression element 6 consisting of a frame 3, a plurality of cylinders 4 formed in the frame 3, and a piston 5 installed in each cylinder 4 so as to freely reciprocate is disposed below the motor 2. supports a crankshaft 7 extending vertically and having one end coupled to the motor 2;
The piston 5 is interlocked and connected to the eccentric shaft portion 7a of the crankshaft 7 via a connecting rod 8, and the motor 2
The piston 5 rotates due to the rotation of the crankshaft 7.
By reciprocating the refrigerant, the refrigerant is sucked into the cylinder 4 and compressed.

Further, the compressor is equipped with an oil supply structure, and this oil supply structure is constructed as shown in FIGS. 1 to 4.

That is, a lower bearing sleeve 9 is attached to the lower end of the frame 3, the lower part of the crankshaft 7 is rotatably supported on the bearing sleeve 9, and a thrust plate 10 and a support 11 are attached to the lower surface of the bearing sleeve 9. When installed, the thrust plate 10 and the holder 11 close the lower surface of the bearing sleeve 9, and extend upward from the lower end surface of the crankshaft 7 to the sliding portion of the compression element 6 and the crankshaft 7. A second opening is provided at the connecting portion between the eccentric shaft portion 7a and the connecting rod 8.
A passage 12 is formed.

On the other hand, an annular passage 13 whose lower surface is open is formed around the outer periphery of the second passage 12 at the lower end of the crankshaft 7, and at a position opposite to the annular passage 13 in the thrust plate 10 and the holder 11. , two first through holes 10a, 11a are formed respectively, and the annular passage 13 of the crankshaft 7 is opened to the oil reservoir 1a of the casing 1 through these through holes 10a, 11a.

Further, a plurality of first passages 14 are formed at a lower position of the crankshaft 7, extending radially outward from the annular passage 13 and opening to the outer peripheral surface of the crankshaft 7, and facing the first passages 14. An annular groove 15 is formed in the inner surface of the bearing hole 9a of the bearing tube 9, while a communication groove 16 extending in the horizontal direction is formed in the support plate 11, and this communication groove 16 is formed in the thrust plate 10. The communication groove 16 is communicated with the annular groove 15 through the second through hole 10b, and communicated with the second passage 12 through the third through hole 10c formed in the center of the thrust plate 10. The annular groove 15 and the second passage 12 are communicated through the communication groove 16.

In this way, the receiver 11 and the thrust plate 1
As the crankshaft 7 rotates, the lubricating oil supplied to the annular passage 13 of the crankshaft 7 from each of the first through holes 11a and 10a of
The centrifugal force acting on the radial portion of the second oil supply passage 12 pressurizes and supplies the oil to the annular groove 15 of the bearing sleeve 9, and the oil is supplied from the annular groove 15 through the second through hole 10b of the thrust plate 10. Receipt 1
Oil is supplied to the communication groove 16 of No. 1, and is supplied from the communication groove 16 to the second passage 12 of the crankshaft 7 through the third through hole 10c of the thrust plate 10, and through this second passage 12, the compression This is done so that lubricating oil is supplied to the sliding part of the element 6 and the connecting part between the crankshaft 7 and the connecting rod 8.

Therefore, in the oil supply structure as described above, the annular groove 15 provided in the lower bearing sleeve 9 is recessed radially outward between the communication position of the first passage 14 and the connection position of the communication groove 16. In addition to forming a plurality of recesses 17, a plurality of dust collecting holes 18 are formed in corresponding portions of the receiver 11 to the recesses 17 and communicating with the recesses 17 via the thrust plate 10.

Specifically, four recessed portions 17 are recessed outward in the radial direction between the communication position of the first passage 14 and the connection position of the communication groove 16 in the annular groove 15 provided in the lower bearing sleeve 9. and the thrust plate 1 facing each recessed portion 17.
Four fourth through holes 10d are formed in the fourth through hole 10d of the receiving metal 11, while four fourth through holes 10d are formed in the fourth through hole 10d of the receiving metal 11.
The dirt collection hole 18 is provided at a location, and the annular passage 1 of the crankshaft 7 is connected from the oil reservoir 1a of the casing 1.
3. The first passage 14 and the annular groove 15 of the bearing sleeve 9
Dust and the like mixed in the lubricating oil reaching the second passage 12 side of the crankshaft 7 through the concave portion 17 are guided to the dust collecting hole 18 and removed.

The recessed portion 17 and the dust collection hole 18 may be formed by drilling, or may be formed simultaneously when the bearing sleeve 9 and the receiver 11 are cast.

In the illustrated embodiment, a gas vent hole 19 is formed that extends from the annular passage 13 of the crankshaft 7 in parallel to the second passage 12 and opens at the upper part of the lower bearing sleeve 9.

Further, in the illustrated embodiment, a bearing metal 20 is interposed between the crankshaft 7 and the lower bearing sleeve 9.

The oil supply structure of the present invention is constructed as described above, and when the compressor is operated, the oil reservoir 1a of the casing 1 is supplied to the receiver 11 and the thrust plate 10.
The lubricating oil introduced into the annular passage 13 of the crankshaft 7 through the annular passage 13 is transferred from the annular passage 13 to the annular passage 13 of the lower bearing sleeve 9 through the first passage 14 due to the centrifugal force accompanying the rotation of the crankshaft 7. Lubricating oil is supplied to the groove 15, and at this time, dust such as metal powder with a large specific gravity mixed in the lubricating oil is thrown out by centrifugal force, and the recessed part 1 formed in the annular groove 15 is formed.
7, and due to its gravity, it is guided through the recessed portion 17, through the thrust plate 10, and into the dust collection hole 18 provided in the receiver 11, where it is removed.

Thus, dirt and the like in the lubricating oil supplied from the annular groove 15 through the thrust plate 10 to the communication groove 16 of the receiver 11 and the second passage 12 of the crankshaft 7 is removed, and the compression element 6 The sliding parts are supplied with lubricating oil that does not contain dirt or other contaminants.

(Effect of the invention) As explained above, in the oil supply structure of the hermetic compressor according to the invention, there is a radius between the communication position of the first passage and the connection position of the communication groove in the annular groove formed in the lower bearing. A plurality of recessed portions recessed outward in the direction are formed, and a plurality of dirt collecting holes are formed in corresponding portions of the receiver to the recessed portions, communicating with the recessed portions via the thrust plate, Due to the centrifugal force accompanying the rotation of the crankshaft,
The oil is sent from the annular groove to the annular groove via the annular passage and the first passage, and from the annular groove to the communication groove and the second passage.
Separates dirt, etc. in the lubricating oil in the annular groove where the oil is supplied to the sliding part of the compression element through the passage, and where a large centrifugal force is exerted by the rotation of the crankshaft. Moreover, the dirt can be collected in the dirt storage hole formed below each of the plurality of recesses, and therefore, the dirt and the like in the lubricating oil can be efficiently and reliably removed. In other words, the sliding part of the compression element can be supplied with lubricating oil that does not contain dust, and the sliding part can be reliably lubricated without causing damage to the sliding part.

[Brief explanation of the drawing]

Fig. 1 is a bottom view showing the main parts of the oil supply structure according to the present invention, Fig. 2 is a longitudinal sectional view taken along line X-X in Fig. 1, Fig. 3 is a bottom view of the thrust plate, and Fig. 4 is a receiving structure. FIG. 5 is a vertical sectional view of a hermetic compressor, and FIG. 6 is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1... Casing, 6... Compression element, 7... Crankshaft, 9... Lower bearing sleeve, 9a... Bearing hole,
10... Thrust plate, 11... Receipt, 12
...Second passage, 13...Annular passage, 14...First
Passage, 15... Annular groove, 16... Communication groove, 17...
...Recessed part, 18...Dust collection hole.

Claims (1)

[Scope of utility model registration request] A compression element 6 and a crankshaft 7 that drives the compression element 6 are housed in a sealed casing 1 having an oil reservoir 1a at the bottom.
The crankshaft 7 is supported by a lower bearing sleeve 9 which extends into the oil reservoir 1a and whose lower surface is closed by a thrust plate 10 and a receiver 11.
The oil sump 1 is connected to the crankshaft 7 through the thrust plate 10 and the holder 11 extending in the axial direction.
a, and a first annular passage 13 communicating with the annular passage 13 and opening to the outer circumferential surface of the crankshaft 7.
A passage 14 and a second passage 12 extending in the axial direction and having one end opened at the lower end of the crankshaft 7 and the other end opened at the sliding portion are formed, while the bearing hole 9 of the bearing sleeve 9 is formed.
an annular groove 15 on the inner surface communicating with the first passage 14;
and the annular groove 15 and the second
In a hermetic compressor oil supply structure in which a communication groove 16 is formed to connect the annular groove 1 to the passage 12, the annular groove 1
A plurality of recessed portions 17 recessed outward in the radial direction are formed between the communication position of the first passage 14 and the connection position of the communication groove 16 at 5, and the recessed portion 17 of the receiver 11 An oil supply structure for a hermetic compressor, characterized in that a plurality of dirt storage holes 18 are formed in corresponding portions to the recessed portion 17 via the thrust plate 10.