KR20090084612A - 2 cylinder rotary compressor - Google Patents

Abstract

In the prior art, the sealing length L for sealing the compression chamber determined from the inner diameter of the partition plate and the outer diameter of the roller could not be sufficiently secured, and the leakage and the efficiency and efficiency of the compressor were sometimes reduced. An object of the present invention is to provide a two-cylinder rotary compressor capable of sufficiently securing the sealing length and improving the capacity or efficiency of the compressor.

In order to achieve the above object, the two-cylinder rotary compressor according to the present invention has a configuration in which the outer diameter of the secondary bearing side eccentric portion is smaller than the outer diameter of the main bearing side eccentric portion. According to the present invention, since the inner diameter of the partition plate can be reduced by making the outer diameter of the sub bearing side eccentric portion smaller than the outer diameter of the main bearing side eccentric portion, the inner diameter of the partition plate and the outer diameters of the main bearing side roller and the sub bearing roller. The sealing length L determined can be fully secured, and the fall of the capacity | capacitance by a leak and the fall of the efficiency of a compressor can be prevented.

Description

2 cylinder rotary compressor {2 CYLINDER ROTARY COMPRESSOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor having two cylinders in a compression mechanism, and more particularly, to a two cylinder rotary compressor suitable for an air conditioner using an HFC refrigerant or a natural refrigerant, a cold air application product, and the like.

7 is a longitudinal sectional view showing a conventional two cylinder rotary compressor. The two-cylinder rotary compressor includes a compression mechanism part connected to the motor part by a crank shaft provided with an electric motor part and two eccentric parts having a phase difference of 180 degrees in a sealed container. The compression mechanism section has two compression elements, and the two cylinders constituting each compression element are connected via partition plates. Two compression chambers are comprised by the main bearing and sub bearings, a cylinder, and a partition plate which support a crankshaft, and the roller fitted to the eccentric part in these two compression chambers rotates eccentrically, and a compression action is performed. Here, the outer diameter of the sub bearing fitting portion fitted to the sub bearing is smaller than the outer diameter of the main bearing fitting portion fitted to the main bearing. In addition, the outer diameter of the eccentric side in the eccentric part of the main bearing side is smaller than the outer diameter of the main bearing fitting part. In addition, the outer diameter of the sub-bearing side eccentric part is the same as the outer diameter of the main bearing side eccentric part.

In order to form a compression mechanism part, after inserting a crankshaft into a main bearing, a roller is inserted into the main bearing side eccentric part of a crankshaft, and the main bearing side cylinder is fastened. Thereafter, the partition plate is passed through the sub-bearing side eccentric portion of the crankshaft and loaded into the main bearing-side cylinder. Insert the sub bearing side roller into the sub bearing side eccentric part located on the partition plate, burn the sub bearing side cylinder, and fasten the sub bearing to the crankshaft sub bearing part.

As described above, in order to configure the compressor, it is necessary to arrange the partition plate in the main bearing side cylinder through the sub bearing side eccentric portion of the crankshaft, so that the inner diameter of the partition plate needs to be larger than the sub bearing side eccentric portion of the crankshaft. .

8 is an enlarged cross-sectional view of a compression mechanism part of the conventional compressor in FIG. During operation of the compressor, the inner diameter of the partition plate is the discharge pressure. The sealing of the compression chamber formed by the cylinder inner diameter and the roller outer diameter in each of the two compression elements is made by the sealing length L determined by the partition plate inner diameter and the roller outer diameter. Therefore, when this sealing length L is small, leakage will occur and the capability and efficiency of a compressor will fall. This phenomenon becomes remarkable when a refrigerant having a large pressure difference between the suction pressure and the discharge pressure is used.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2002-138978

In the prior art, the sealing length L of the compression chamber determined from the inner diameter of the partition plate and the outer diameter of the roller could not be sufficiently secured, and the leakage and the efficiency and efficiency of the compressor were sometimes reduced. An object of the present invention is to provide a two-cylinder rotary compressor capable of sufficiently securing the sealing length and improving the capacity or efficiency of the compressor.

In order to solve the said subject, the 2-cylinder rotary compressor which concerns on this invention is equipped with the electric motor part, the compression mechanism part connected to the electric motor part by the crankshaft, and the airtight container containing the electric motor part and the compression mechanism part, The crankshaft, A main bearing fitting part fitted to the main bearing on one side and a sub bearing fitting part fitted to the sub bearing on the other side, and having a phase difference of 180 degrees between the main bearing fitting part and the sub bearing fitting part; The main bearing side which has a bearing side eccentric part and a sub bearing side eccentric part, and the compression mechanism part is arrange | positioned so that it may contact the outer periphery of the main bearing side roller and the main bearing side roller fitted to the main bearing side eccentric part, and the main bearing side eccentric part. Main bearing side compression element with cylinder, secondary bearing side roll fitted to secondary bearing side eccentric and secondary bearing side eccentric And a partition plate positioned between the main bearing side compression element and the sub bearing side compression element, the sub bearing side compression element having a sub bearing side cylinder arranged to be in contact with the outer circumference of the sub bearing side roller. In a two-cylinder rotary compressor in which the main bearing side roller and the sub bearing side roller are eccentrically rotated in the compression chamber formed by the main bearing and the sub bearing and the compression mechanism part, the outer diameter of the sub bearing side eccentric portion is the main bearing side. It was set as the structure made smaller than the outer diameter of an eccentric part.

According to the present invention, since the inner diameter of the partition plate can be reduced by making the outer diameter of the sub bearing side eccentric portion smaller than the outer diameter of the main bearing side eccentric portion, the inner diameter of the partition plate and the outer diameters of the main bearing side roller and the sub bearing roller. The sealing length L determined can be fully secured, and as a result, the fall of the capacity | capacitance of a compressor by the leakage and the fall of the efficiency of a compressor can be prevented.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of the 2-cylinder rotary compressor of this invention is demonstrated using drawing.

[First Embodiment]

1 is a longitudinal sectional view showing a two-cylinder rotary compressor in the first embodiment of the present invention. FIG. 2 is an assembly process diagram of the compression mechanism part of the two-cylinder rotary compressor in FIG. 3 is an enlarged cross-sectional view of the compression mechanism part of the two-cylinder rotary compressor in FIG.

In the two-cylinder rotary compressor of FIG. 1, the airtight element and the compression mechanism connected to the electric element by the crankshaft 5 are contained in the sealed container 1. The airtight container 1 is comprised by the cylinder 1A, the lid 1B, and the bottom 1C. The cylinder 1A is an iron plate, and is cylindrical in shape, opened up and down. The lid 1B and the bottom 1C are fitted to the cylinder 1A, and the fitting portion is welded to seal the inside.

The transmission element is composed of a stator 3 fixed to the sealed container 1 by shrinkage fitting or the like, and a rotor 4 in which the crankshaft 5 is fitted.

The compression mechanism part includes the main bearing 6, the crankshaft 5, the sub bearing 10, the main bearing side cylinder 7, the sub bearing side cylinder 9, the main bearing side roller 11, and the sub bearing side roller. (12), the main bearing side vane 13, the sub bearing side vane 14, and the partition plate 8 are comprised as a main element. In the compression mechanism, the main bearing side cylinder 7 and the sub bearing side cylinder 9 are arranged on both sides of the partition plate 8, and the crankshaft 5 is arranged in the center.

The crankshaft 5 has a main bearing fitting part 20 fitted to the main bearing 6 on one side and a sub bearing fitting part 21 to be fitted to the sub bearing 10 on the other side. In addition, the crankshaft 5 includes an eccentric main bearing side eccentric part 5A and a sub bearing side eccentric part having a phase difference of 180 degrees between the main bearing insertion part 20 and the sub bearing insertion part 21. 5B), and are integrally formed with these main bearing side eccentric portions 5A and sub bearing side eccentric portions 5B. The sub bearing side roller 12 is rotatably fitted in the main bearing side eccentric part 5A of the crankshaft 5 to the main bearing side roller 11 and the sub bearing side eccentric part 5B. The main bearing side vane 13 to the main bearing side cylinder 7 and the sub bearing side cylinder 9 to the sub bearing side vane so as to contact the outer peripheries of the main bearing side roller 11 and the sub bearing side roller 12, respectively. (14) is fitted. That is, the compression mechanism part is arranged so as to contact the outer circumference of the main bearing side roller 11 and the main bearing side roller 11 fitted to the main bearing side eccentric part 5A and the main bearing side eccentric part 5A. The subordinate bearing side roller 12 and the sub bearing side roller 12 fitted to the main bearing side compression element having the bearing side cylinder 7, the sub bearing side eccentric part 5B and the sub bearing side eccentric part 5B. And a sub bearing side compression element having a sub bearing side cylinder 9 arranged to contact the outer circumference of the diaphragm, and a partition plate 8 positioned between the main bearing side compression element and the main bearing side eccentric.

On the axially outer side of the compression mechanism part, the main bearing fitting part 20 and the sub bearing fitting part 21 which support the crankshaft 5 are arrange | positioned. The crankshaft 5 is rotatably arrange | positioned by inserting the main bearing fitting part 20 and the sub bearing mounting part 21 in the main bearing 6 and the sub bearing 10, respectively.

The main bearing side cylinder 7 is fastened to the main bearing 6 by the main bearing fastening bolt 15. Moreover, the sub bearing 10 and the sub bearing side cylinder 9 are fastened to the main bearing side cylinder 7 via the partition plate 8 via the sub bearing fastening bolt 16. And the outer diameter of the main bearing 6 is fixed to the cylinder 1A by welding etc., and the compression mechanism part is fixed in the airtight container 1.

In the airtight container 1, the necessary amount of refrigerator oil (not shown) is enclosed.

Through the suction tank 2, the refrigerant sucked into the main bearing side cylinder 7 and the sub bearing side cylinder 9 is discharged from the suction pressure in each compression element (the main bearing side compression element and the sub bearing side compression element). It is compressed up to the discharge pressure. Thereafter, the compressed refrigerant is once discharged into the sealed container 1, and is discharged in a cycle such as an air conditioner from the discharge pipe 17 provided in the sealed container 1.

2, the assembling process of the two cylinder rotary compressor is explained below. First, the main bearing fitting portion 20 is fitted into the main bearing 6. The main bearing side cylinder 7 is temporarily fixed to the main bearing 6, and the crankshaft 5 is rotatably fitted to the main bearing 6. The main bearing side roller 11 is rotatably fitted in 5 A of main bearing side eccentric parts of the crankshaft 5. The gap between the inner diameter of the main bearing side cylinder 7 and the outer diameter of the main bearing side roller 11 is adjusted to engage the main bearing 6 and the main bearing side cylinder 7. Thereafter, the main bearing side vanes 13 are inserted (FIG. 2A).

Next, the partition plate 8 is inserted from the sub bearing fitting portion 21 of the crankshaft 5, passed through the sub bearing side eccentric portion 5B, and loaded into the main bearing side cylinder 7 [ 2 (B)].

Thereafter, the sub bearing side roller 12 is rotatably fitted into the sub bearing side eccentric 5B of the crankshaft 5. The secondary bearing side cylinder 9 is loaded on the partition plate. The gap between the inner diameter of the secondary bearing side cylinder 9 and the outer diameter of the secondary bearing side roller 12 is adjusted and temporarily fixed with a positioning bolt (not shown). Thereafter, the secondary bearing side vanes 14 are inserted (FIG. 2C).

Next, the sub bearing 10 is rotatably fitted into the sub bearing fitting portion 21 of the crankshaft 5. The sub bearing 10 is fixed to the main bearing side cylinder 7 through the partition plate 8 and the sub bearing side cylinder 9 by the sub bearing fastening bolt 16 (Fig. 2 (D)). .

In the two-cylinder rotary compressor, since the partition plate 8 is inserted from the sub bearing fitting portion 21 (FIG. 2B), the inner diameter of the partition plate 8 is replaced by the sub bearing side eccentric part 5B. It is bound to be larger than the outer diameter of. As the inner diameter of the partition plate 8 is smaller, the sealing length L determined by the inner diameter of the partition plate 8 and the outer diameters of the main bearing side roller 11 and the sub bearing side roller 12 can be sufficiently secured. Usually, since the outer diameter of 5 A of main bearing side eccentric parts, and the outer diameter of sub bearing side eccentric part 5B are the same, the outer diameter and partition plate of main bearing side eccentric part 5A and sub bearing side eccentric part 5B are divided. The inner diameter of (8) becomes the same. When the outer diameter of the main bearing side eccentric part 5A and the sub bearing side eccentric part 5B and the inner diameter of the partition plate 8 are the same, as shown in the prior art of FIG. The sealing length L determined by the outer diameter of the bearing side roller 11 and the sub bearing side roller 12 could not be sufficiently secured, and the performance and efficiency of the compressor due to leakage were sometimes reduced. Here, in this invention, as shown in FIG. 3, the outer diameter of the sub bearing side eccentric part 5B is made smaller than the outer diameter of 5 A of main bearing side eccentric parts. Since the inner diameter of the partition plate 8 can be made small by making the outer diameter of the sub bearing side eccentric part 5B smaller than the outer diameter of 5 A of main bearing side eccentric parts, 5 A of main bearing side eccentric parts, and a sub bearing. The sealing length L which seals a compression chamber can fully be ensured compared with the case where the outer diameter of the side eccentric part 5B and the inner diameter of the partition plate 8 are the same. Therefore, the fall of the capacity | capacitance by a leak and the fall of the efficiency of a compressor can be prevented. Moreover, it is preferable that the inner diameter of the partition plate 8 is more than the outer diameter of the sub bearing side eccentric part 5B, and is smaller than the outer diameter of 5 A of main bearing side eccentric parts. More preferably, the outer diameter of the sub-bearing side eccentric part 5B and the inner diameter of the partition plate 8 are made substantially the same. By making the outer diameter of the sub-bearing side eccentric part 5B and the inner diameter of the partition plate 8 substantially the same, the sealing length L which seals a compression chamber can be made longest.

Here, in the prior art, the outer diameter of the anti-eccentric side in the main bearing side eccentric portion 5A is made smaller than the outer diameter of the main bearing fitting portion 20, so that the eccentric portion outer diameter is made as small as possible. However, if the outer diameter of the half eccentric side in the main bearing side eccentric part 5A is smaller than the outer diameter of the main bearing fitting part 20, it will become difficult to process and the main bearing fitting part of the crankshaft 5 will be made. The rigidity of the connection part of 20 and 5 A of main bearing side eccentric parts falls, and reliability falls. In this embodiment, the outer eccentric side outer diameter of the main bearing side eccentric part 5A of the crankshaft 5 is made larger than the outer diameter of the main bearing insertion part 20. When the half eccentric side outer diameter of the main bearing side eccentric part 5A is made larger than the outer diameter of the main bearing insertion part 20, processing is easy and the strength of the crankshaft 5 can be ensured enough. Moreover, even if the half eccentric side outer diameter of the sub bearing side eccentric part 5B of the crankshaft 5 is larger than the outer diameter of the sub bearing insertion part 21, the above effects can be acquired.

In addition, in this embodiment, the outer diameter of the sub bearing fitting part 21 of the crankshaft 5 is made smaller than the outer diameter of the main bearing fitting part 20. As the outer diameter of the main bearing fitting portion 20 and the sub bearing bearing fitting portion 21 is smaller, the sliding loss can be reduced. By reducing the outer diameter of the sub bearing bearing part 21 which does not require rigidity with respect to the main bearing fitting part 20, sliding movement loss can be reduced, ensuring the required rigidity as a whole.

Second Embodiment

Fig. 4 is a longitudinal sectional view showing the two cylinder rotary compressor in the second embodiment of the present invention. The total unbalance amount of the main bearing side eccentric portion 5A and the main bearing side roller 11 of the crankshaft 5, and the sub bearing side eccentric portion 5B and the sub bearing side roller 12 of the crank shaft 5; The total unbalance amount of is adjusted to the shape of the sub bearing side roller 12. Since the balance weights 4A and 4B of the conventional rotor 4 need not be changed and can be used as they are, the increase in cost due to the production of the new rotor 4 can be suppressed.

[Example]

Fig. 5 is a longitudinal sectional view showing the two cylinder rotary compressor in the third embodiment of the present invention. The total unbalance amount of the main bearing side eccentric portion 5A and the main bearing side roller 11 of the crankshaft 5, and the sub bearing side eccentric portion 5B and the sub bearing side roller 12 of the crank shaft 5; The total unbalance amount is set to be not equal, and the balance weight 4B is provided only on the lower side of the rotor 4 as the counter balance weight. You may install in the crankshaft 5 in the same position. Similarly to the first embodiment, the sealing length L is sufficiently secured to improve the capacity and efficiency of the compressor, and in this embodiment, the vibration can be further suppressed. In addition, since the balance weight becomes one, the cost of the balance weight can be reduced.

[Example 4]

Fig. 6 is a longitudinal sectional view showing the two-cylinder rotary compressor in the fourth embodiment of the present invention. The total unbalance amount of the main bearing side eccentric portion 5A and the main bearing side roller 11 of the crankshaft 5, and the sub bearing side eccentric portion 5B and the sub bearing side roller 12 of the crank shaft 5; The total unbalance amount is set to be not equal, and the balance weight 18 is provided only below the negative bearing side eccentric portion 5B of the crankshaft 5 as the counter balance weight. Similarly to the first embodiment, the sealing length L is sufficiently secured to improve the capacity and efficiency of the compressor, and in this embodiment, the vibration can be further suppressed. In addition, since the balance weight becomes one, the cost of the balance weight can be reduced.

According to each said embodiment, since the inner diameter of the partition plate 8 can be made small by making the outer diameter of the sub bearing side eccentric part 5B smaller than the outer diameter of 5 A of main bearing side eccentric parts, the partition plate 8 is carried out. The sealing length L determined by the inner diameter of the inner diameter and the outer diameter of the main bearing side roller 11 and the sub bearing side roller 12 can be sufficiently secured. The fall can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a two cylinder rotary compressor in a first embodiment of the present invention.

FIG. 2 is an assembly process diagram of the compression mechanism part of the two-cylinder rotary compressor in FIG. 1; FIG.

3 is an enlarged cross-sectional view of a compression mechanism part of the two-cylinder rotary compressor in FIG. 1;

Fig. 4 is a longitudinal sectional view showing the two cylinder rotary compressor in the second embodiment of the present invention.

Fig. 5 is a longitudinal sectional view showing a two cylinder rotary compressor in a third embodiment of the present invention.

Fig. 6 is a longitudinal sectional view showing a two cylinder rotary compressor in the fourth embodiment of the present invention.

7 is a longitudinal sectional view showing a two-cylinder rotary compressor of the prior art;

8 is an enlarged cross-sectional view of a compression mechanism part of the conventional compressor in FIG.

<Explanation of symbols for the main parts of the drawings>

1: sealed container

1A: Cylinder

1B: cover

1C: Floor

2: suction tank

3: stator

4: rotor

4A, 4B, 18: Balance Weight

5: crankshaft

5A: Main bearing side eccentric part

5B: Sub bearing side eccentric part

6: main bearing

7: Main bearing side cylinder

8: partition plate

9: negative bearing side cylinder

10: negative bearing

11: main bearing side roller

12: secondary bearing side roller

13: main bearing side vane

14: sub bearing side vane

15: main bearing fastening bolt

16: negative bearing fastening bolt

17: discharge pipe

20: main bearing insert

Claims (7)

An electric motor part, a compression mechanism part connected to said electric motor part by a crankshaft, and a sealed container containing said electric motor part and said compression mechanism part, The crankshaft has a main bearing fitting part fitted to the main bearing on one side and a sub bearing fitting part fitted to the sub bearing on the other side, and is provided between the main bearing fitting part and the sub bearing fitting part. Has a main bearing side eccentric part and a sub bearing side eccentric part having a phase difference of 180 degrees, The compression mechanism portion has a main bearing side compression element having a main bearing side roller fitted to the main bearing side eccentric portion and the main bearing side eccentric portion and a main bearing side cylinder arranged to contact an outer circumference of the main bearing side roller. A sub bearing side compression element having a sub bearing side roller fitted to the sub bearing side eccentric part and the sub bearing side eccentric part and a sub bearing side cylinder arranged to contact the outer periphery of the sub bearing side roller; A partition plate positioned between the bearing side compression element and the sub bearing side compression element, A two-cylinder rotary compressor in which a compression action is performed by eccentrically rotating the main bearing side roller and the sub bearing side roller in a compression chamber formed by the main bearing, the sub bearing, and the compression mechanism portion supporting the crankshaft. The outer cylinder of the said sub-bearing side eccentric part was made smaller than the outer diameter of the said main bearing side eccentric part. The two-cylinder rotary compressor according to claim 1, wherein an inner diameter of the partition plate is equal to or larger than an outer diameter of the secondary bearing side eccentric portion and is smaller than an outer diameter of the main bearing side eccentric portion. The two-cylinder rotary compressor according to claim 2, wherein an inner diameter of the partition plate is substantially the same as an outer diameter of the secondary bearing side eccentric portion. The said 2-cylinder rotary compressor fits the said main bearing fitting part to the said main bearing, sets the said main bearing side compression element to the said main bearing, The said division is a said 2nd cylinder rotary compressor. A plate is inserted from the secondary bearing fitting to set the primary bearing side compression element, the secondary bearing side compression element is set to the partition plate, and the secondary bearing fitting portion is fitted to the secondary bearing to insert the secondary bearing. And the second bearing-side compression element. The two-cylinder rotary compressor according to any one of claims 1 to 3, wherein an outer diameter of the sub bearing fitting portion is smaller than an outer diameter of the main bearing fitting portion. The total unbalance amount of the said sub-bearing side eccentric part and the said sub-bearing side roller is approximately equal to the total unbalance amount of the said main bearing side eccentric part and the said main bearing side roller. A two-cylinder rotary compressor characterized by the same. The balance weight is provided in any one of a rotor, upper part than the said main bearing side eccentric part, or lower part than the said sub bearing side eccentric part. Cylinder rotary compressor.

Images