JPH02123294A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the manufacturing manhours and improve the rigidity of cylinders by providing a second through-hole in a first cylinder corresponding to a first through-hole, a third and fourth through-hole in a partition plate and a second cylinder corresponding to the second through-hole, and inserting a spring pin through the second, third and fourth through-holes. CONSTITUTION:Bolt holes for connecting a bearing 26 with a first cylinder 30 are formed through to be first and second through-holes 24, 25 and 38, 39, and third and fourth through-holes 41, 42 and 43, 44 are formed in a partition plate 31 and a second cylinder 29 corresponding to the first through-hole 34, 35. A spring pin 45 is inserted through the second, third, and fourth through- holes 38, 39, 41, 42, and 43, 44, and the second through-holes 38, 39 are also used for positioning for bolt connection, thereby processing manhours can be reduced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a two-cylinder system in which two cylinders are provided in a sealed case.
Regarding a cylinder type rotary compressor.

(Prior Art) A general two-cylinder type rotary compressor is constructed as shown in FIG. The sealed case 1 shown in the figure is formed by combining a first case 2 and a second case 3 formed by press molding, and inside this sealed case 1 is an electric motor section 4. and a compression mechanism section 5 are housed therein.

The electric motor section 4 includes a stator 6 attached to the inner surface of the sealed case 1, and a rotor 8 provided at the center of the stator 6 and rotatably supported with a rotating shaft 7 at the center. It consists of

The lower end of the rotating shaft 7 extends downward and is rotatably supported by a main bearing 9 and a sub-bearing 10. Two crank parts 11.12 are formed in the middle of the rotating shaft 7 located between the main bearing 9 and the sub-bearing 10, and at positions corresponding to these crank parts 11.12. Upper and lower cylinders 13.14 are provided surrounding the crank portion 111.12. The main bearing 9 is superimposed on the upper center of the upper cylinder 13 provided on the upper side, and this cylinder 13
A fixed frame 15 is coupled to the upper outer circumferential surface of.

This fixed frame 15 is attached to the second frame by spot welding or the like.
It is joined to the inner peripheral surface of the case 3. Also, a partition plate 16 is provided between the upper and lower cylinders 13 and 14.
are sandwiched between the upper and lower cylinders 13.14
It maintains a sealed state between the two.

Furthermore, the crank part 11 located within each cylinder 13.14
．． Rollers 17 and 18 are mounted around the roller 12, and a blade (not shown) comes into elastic contact with the rollers 17 and 18 to seal the compression chamber.

This compression mechanism section 5 is constructed by a plurality of connecting bolts 19.
Main bearing 9, upper cylinder 13, partition plate 1
6. The lower cylinder 14 and the sub-bearing 10 are tightened from above and below and connected to the fishing line.

The fixed frame 15 is connected to the upper surface of the upper cylinder 13 by bolts 20.
The compression mechanism section 5 is coupled within the sealed case 1 via a fixed frame 15.

Further, the tips of two suction pipes 20.21, which are inserted into the upper and lower cylinders 13.14 from outside the sealed case 1 in a penetrating manner, are press-fitted therein. The proximal ends of these suction pipes 20 and 21 are respectively connected to an accumulator 22 located outside the closed case 1.

In the rotary compressor as described above, when assembling the upper and lower cylinders 13, 14 and the partition plate 16, a through hole (not shown) formed in the partition plate 16 is inserted.
A spring pin (not shown) with a length exceeding the thickness of the partition plate 16 is inserted, and non-through holes with a predetermined depth are bored in the upper and lower cylinders 13 and 14 corresponding to the positions where the spring pin protrudes. However, an alignment structure is provided in which mutual alignment is achieved by inserting the protruding spring pin into this non-through hole.

However, such an alignment structure increases the number of man-hours required for machining the parts to form the non-through holes, and also reduces the rigidity of the cylinders 13 and 14.

(Problem to be solved by the invention) The compression mechanism of a general two-cylinder rotary compressor is assembled by sandwiching a partition plate between two cylinders. , a through hole is bored in the partition plate, a spring pin longer than the thickness of the partition plate is inserted, and the end of the spring pin protruding from the partition plate is connected to each of the two cylinders. A positioning structure is provided that is inserted into a non-through hole drilled at the position to perform mutual positioning.

However, the process of drilling the above-mentioned non-through holes at predetermined positions leads to an increase in manufacturing man-hours and has the drawback of reducing the rigidity of the cylinder.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rotary compressor that reduces manufacturing man-hours and improves the rigidity of a cylinder compared to a conventional structure.

[Structure of the invention]

(Means for solving the problem) A partition plate is sandwiched between the first and second cylinders, bearings are superimposed on the outer surfaces of these first and second cylinders, and the partition plate is rotatably supported by these bearings. A rotating shaft for rotating a roller in the cylinder is provided, two or more first through holes are bored in one of the bearings, and a female thread is provided in the first cylinder corresponding to these first through holes. A second through-hole having a section is bored, third and fourth through-holes are bored in the partition plate and second cylinder corresponding to the second through-hole, and the second, third and The rotary compressor has a spring pin inserted through the fourth through hole.

(Function) Bolt holes for connecting the bearing and the first cylinder are formed in a penetrating state to form first and second through holes, and a partition plate and a second through hole corresponding to the first through holes are formed.
By forming third and fourth through holes in the cylinder and inserting a spring pin across the second, third and fourth through holes, the second through hole for bolt connection is positioned. Since it can also be used for alignment, the number of processing steps can be reduced. In addition, since each processed portion is constituted by a through hole, it is easy to remove chips and the like.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 to 5. The lower end of a rotating shaft 24 extended from an electric motor section (not shown) is inserted into the compression mechanism section 23 shown in the figure, and this rotating shaft 24 is connected to a may bearing 25 provided on the upper side and a may bearing 25 provided on the lower side. It is rotatably supported by a sub-bearing 26. Two crank parts 27.2g are formed on the rotating shaft 24 located between the main bearing 25 and the sub-bearing 26. An upper cylinder 29 as a second cylinder and a lower cylinder 30 as a first cylinder are provided at positions corresponding to these crank parts 27, 28. These upper and lower cylinders 29.30
A partition plate 31 is sandwiched between the cylinders 29 and 30 to separate the compression chambers of each cylinder 29, 30. A roller 27 is provided on the outer periphery of the crank portion 27, 28.
A and 28a are respectively mounted on a ring, and these rollers 27a and 28a have respective cylinders 29a and 28a.
．． A blade (not shown) elastically protruding from the inner surface of 30 is in contact with the blade.

Further, the sub-bearing 26 has the rotating shaft 2 at the center.
A bearing portion 32 is formed to rotatably support 4.
A flange portion 33 is formed on the outer periphery of this bearing portion 32 . This flange portion 33 is provided with first through holes 34 and 35 in the thickness direction. These first through holes 34, 35 have a large diameter on the lower side, and form a seat surface 37 against which the head of the set bolt 36 comes into contact.

The lower cylinder 3o superimposed on the upper part of the sub-bearing 26 formed in this way is connected to the first through hole 34.
A second through hole 38.3 is provided at a position corresponding to each of the holes 38.3 and 35.
9 is drilled.

The lower cylinder 30 is formed as shown in FIGS. 2 and 3, and a compression chamber 40 is formed in the center, and the second through hole 38, 39 is formed in the compression chamber 4o. It is formed in the thick part that forms the periphery of the . The second through hole 38.39 close to the surface abutting the sub-bearing 26 is formed with a female threaded portion 40.40 into which the set bolt 36.36 is screwed.

Furthermore, the partition plate 31 superimposed on the upper side of the lower cylinder 30 has a third through hole 38.39 at a position corresponding to the second through hole 38.39 with a diameter between the second through hole 38.39 and the path. Through holes 41, 42 are drilled.

Further, in the upper cylinder 29 superimposed on the upper surface of the partition plate 31, a fourth through hole 43.44 is bored at a position corresponding to the third through hole 41.42.

That is, corresponding to the first through holes 34.35 drilled in the sub-bearing 26, second through holes 38. 39, a third through hole 41.42 and a fourth through hole 43.44 are arranged.

When assembling the compression mechanism section 23 formed in this way, first, the sub-bearing 26 and the lower cylinder 30 are assembled.
The sub-bearing 26 and the lower cylinder 30 are coupled by inserting a set bolt 36.36 from the first through-hole 34.35 side and screwing it into the second through-hole 38.39. be able to.

Next, the spring pins 45.45 are inserted into the third through holes 41.42 of the partition plate 31 as shown in FIG. The spring pins 45, 45 are longer than the thickness of the partition plate 31, and are inserted with both ends protruding from the partition plate 31.

The partition plate 31 in this state is overlapped with the lower cylinder 30, and the protruding ends of the spring pins 45 are inserted into the second through holes 38, 39 to achieve alignment. Also, when the upper cylinder 29 is superimposed on the upper surface of the partition plate 31, the spring pin 45 protruding from the upper part
．． 45 into the fourth through-hole 43.44.

The spring pin 45 is formed into a cylindrical shape, with a plurality of slits formed between the ends so that the diameter of the central part increases, and an elastic pin is formed on the inner circumferential surface of each through hole. They are designed to touch each other.

The compression mechanism section 23, which has been aligned by inserting the spring pins 45 and 45 as described above, is tightened from above and below by bolts (not shown) that are inserted from the main bearing 25 side and screwed together in a penetrating state. Main bearing 25, upper cylinder 29, partition plate 3
1. The lower cylinder 30 and the sub-bearing 26 are connected.

As described above, by processing the second through holes 38, 39 and the fourth through holes 43, 44 into a penetrating state, it is possible to easily remove chips during processing, thereby improving the workability of assembly. can. Furthermore, since the second through holes 38 and 39 into which the set bolt 36 is screwed are also used as positioning holes into which the spring pin 45 is inserted, the number of holes to be drilled is reduced compared to the conventional one, and the lower cylinder 30 is It can improve rigidity.

The partition plate 31 is formed by sintering metal powder, and after polishing the surface, a phosphate treatment is performed to form a treated layer on the surface.
The treatment layer is configured to enhance wear resistance and lubricity. Further, this surface treatment may be performed by soft nitriding treatment.

By using the partition plate 31 that has been surface-treated as described above, it improves wear resistance and lubricity against contact with the rollers 27a and 28a, which occurs noticeably when the rotary compressor operates at high speeds and under high loads. It is possible to measure the improvement in Moreover, the partition plate 31 is a sintered member, and by performing the above-described surface treatment, the fine holes on the surface can be sealed and the surface can be finished with high precision.

Note that the present invention is not limited to the above embodiment.

〔Effect of the invention〕

In order to connect the bearing and the first cylinder, a second through hole for screwing a bolt is bored through the first cylinder, and a second through hole is formed in the partition plate corresponding to the second through hole. By drilling a third through hole and further drilling a fourth through hole in the second cylinder corresponding to the third through hole, the bolt-based connection structure is configured, and
The first and second cylinders and the second and third partition plates
, and the fourth through hole to allow mutual alignment during assembly. Since the second, third, and fourth through holes are formed in a penetrating state, it is easy to remove chips during machining, and the bolt holes for assembly and springs for positioning can be easily removed. By also serving as a hole for pin insertion,
The rigidity of the cylinder can be increased by reducing the number of holes drilled in the cylinder.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, and FIG. 1 is a front sectional view of the compression mechanism of a rotary compressor;
Fig. 2 is a plan view of the lower cylinder, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, Fig. 4 is a plan view of the partition plate, and Fig. 5 is a v-- A cross-sectional view of the v-line part,
FIG. 6 is a side sectional view of a conventional rotary compressor. 29... Upper cylinder (second cylinder) 30...
・Lower cylinder (first cylinder) 25...Main bearing (bearing) 26...Sub bearing (
bearing), 27a. 28a...Roller, 24...Rotating shaft, 34.35.
...First through hole, 36...Set bolt (bolt)
, 38.39...Second through hole, 40...Female screw portion, 31...Partition plate, 41.42...Third through hole, 43.44...Fourth through hole , 45...spring bin.

Claims (1)

[Claims] The first and second cylinders are superimposed with a partition plate in between, two bearings are superimposed on the outer surfaces of these first and second cylinders, and the above-mentioned cylinder is rotatably supported by these bearings. In a rotary compressor equipped with a rotating shaft that rotates a roller provided in a cylinder, two or more first through holes are bored in one of the bearings, and a first through hole corresponding to these first through holes is formed in one of the bearings. a second through hole formed with a female thread portion into which a bolt inserted from the first through hole is screwed into the first cylinder;
Third and fourth through holes having approximately the same diameter are bored in the partition plate and second cylinder corresponding to these second through holes, and the second through hole is extended across the second, third and fourth through holes. A rotary compressor characterized by inserting a spring pin.