JP2001323886A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a generation of vibration and noise without increasing a friction loss and making a structure complex and large-sized. SOLUTION: The above purpose is accomplished by pivotally supporting a crank shaft 12 by an end plate, at an electric motor 8 side, of a cylinder 3 and a sub-bearing part 17 disposed in opposition to a rotary compressor mechanism 2 side of the electric motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rotary compressor mainly used for refrigeration and air conditioning, whether for business use or non-business use, and more particularly to a rotary compression mechanism and an electric motor for driving the rotary compression mechanism in a container. The present invention relates to a stored rotary compressor.

[0002]

2. Description of the Related Art Electric compressors for refrigeration and air conditioning include reciprocating compressors, rotary compressors and scroll compressors, all of which have been used in home and commercial refrigeration and air conditioning fields. I have. Currently, it is growing by making use of its features in terms of cost and performance.

[0003] Among them, a compressor in which a compression mechanism and an electric motor are housed in a container is represented by a so-called hermetic compressor intended for soundproofing and maintenance-free, and a scroll compressor and a rotary compressor are mainly used. Conventionally, as a rotary compressor, a vertical type which is installed vertically as shown in FIG. 4 is widely used. In this apparatus, a rotary compression mechanism b is disposed at a lower portion in a container a, and an electric motor c is disposed thereon. The crankshaft d having the rotor n of the electric motor c is
Cylinder e passing through cylinder e of rotary compression mechanism b
It is connected to a piston j which is eccentrically rotated inside, and is supported by sliding bearings h and i of an upper end plate f and a lower end plate g which close the top and bottom of a cylinder e. The sliding bearings h and i realize a two-point support structure using a portion through which the crankshaft d passes through the cylinder e, and also function as a seal for preventing leakage of refrigerant at the bearings. ing. For this sealing, each of the sliding bearings h and i requires a seal length of a predetermined length or more, that is, the axial length of the sliding bearing surface. The sliding bearing portion i of the lower end plate g has a length that satisfies this, the sliding bearing portion h of the upper end plate f has a length that exceeds the required seal length, and the crankshaft d. Is prevented on the rotor n side.

However, in the conventional structure as described above, the rotation of the crankshaft d due to the variation of the eccentric load due to the eccentric portion including the piston j and the mounting error of the first balance weight k and the second balance weight m are caused. It is difficult to achieve a perfect balance. For this reason, in reality, it is impossible to prevent the occurrence of vibration and noise due to rotational imbalance, and it is no longer possible to respond to recent demands for low noise, miniaturization, and high performance.

[0005] The upper end plate f above and below the cylinder e
Even if the sliding bearing portion h is designed to be longer than the required seal length, the two-point support position of the crankshaft d by the lower end plate g is deviated downward from the rotor n side. This is because the bearing function does not sufficiently reach the rotor n side with a large load.

Accordingly, Japanese Patent Publication No. 5-84398 discloses that
Improved technology that suppresses vibration and noise by supporting the end of the crankshaft with two-point support by the upper and lower bearings of the compression mechanism, and by supporting the auxiliary sliding bearing fixed to the stator on the anti-compression mechanism side of the motor c. Is disclosed.

[0007]

However, in such a conventional improvement technique, three-point support by a sliding bearing portion is essential, and the frictional loss is increased, thereby deteriorating the efficiency of the compressor.

An object of the present invention is to provide a rotary compressor capable of preventing generation of vibration and noise without increasing friction loss, complicating the structure, or increasing the size.

[0009]

In order to solve the above problems, a rotary compressor according to the present invention comprises a cylinder closed by an end plate, a piston eccentrically rotating in the cylinder, and a vane driven by the piston. A rotary compression mechanism having a motor connected to the piston in the cylinder and a crankshaft penetrating the end plate and eccentrically rotating the piston;
Wherein the crankshaft is supported by an end plate on the electric motor side of the cylinder and a sub-bearing disposed on the anti-rotary compression mechanism side of the electric motor.

In such a configuration, in a structure in which a rotary compression mechanism and an electric motor for driving the rotary compression mechanism are housed in a container as in the conventional case, the motor eccentrically rotates the piston in the cylinder in the rotary compression mechanism by the crankshaft. By providing a bearing on the side opposite to the rotary compression mechanism of the electric motor, a bearing structure that supports two points on both sides of the portion of the crankshaft having the rotor can be obtained, which prevents bending of the crankshaft, and furthermore, rotary compression. The load on the bearing is reduced by the end plate of the mechanism, and the eccentric rotation of the piston that rotates eccentrically of the crankshaft can be stably supported in the immediate vicinity by one conventional bearing with one end plate supporting the two points. In addition, the entire crankshaft can be stably supported by the two bearing portions, thereby preventing generation of vibration and noise. In addition, only two bearings are required, and the structure in which the crankshaft of the end plate on the side opposite to the electric motor in the cylinder penetrates and the necessity of sealing the penetrating part is eliminated, so that the structure becomes particularly complicated or large. I will not do it. Further, there is no possibility that the friction loss increases due to three or more sliding bearing portions and the efficiency of the compressor deteriorates.

If the auxiliary bearing is to support the crankshaft with a rolling bearing, the frictional resistance at this bearing is reduced, so that the efficiency of the compressor is increased and the crankshaft is connected to the rotary compression mechanism. Even when used in combination with a structure in which both the motor-side end plate and the counter-motor-side end plate are supported by sliding bearings, a three-point support structure is realized without problems due to an increase in frictional resistance as in the case of the above-mentioned conventional technology. In addition, the performance can be further improved.

When the sub-bearing is provided with a fixing member fixed to the container, mutual positioning based on the container can be performed in common with other devices such as a rotary compression mechanism and an electric motor, and the center of the bearing is provided. Easy to put out.

When the mesh for separating oil is provided in the refrigerant passage portion of the sub-bearing portion, the provision of the sub-bearing portion makes it possible to accompany the refrigerant without particularly complicating the structure. The separated oil can be separated, and the amount of oil discharged can be reduced.

If the bearing at the end plate is provided with a rolling bearing, the frictional resistance can be reduced correspondingly, and the efficiency of the rotary compression mechanism is further improved.

[0015] The refrigerant is a chlorine-free hydrocarbon-hydrocarbon system,
Even if a hydrocarbon system is used and the lubricating effect cannot be expected from the refrigerant, the support of the crankshaft is stable, so that seizure or the like hardly occurs, which is practically advantageous from the viewpoint of maintenance-free use.

Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations as much as possible.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below in detail with reference to the drawings, for an understanding of the present invention.

(Embodiment 1) As shown in FIG. 1, a rotary compressor according to Embodiment 1 has a container 1 which is closed when connection with refrigeration cycle equipment is completed.
A rotary compression mechanism 2 is disposed at a lower portion in the container 1, and an electric motor 8 is disposed thereon. The rotary compression mechanism 2 includes a cylinder 3 fixed in the container 1, a piston 4 eccentrically rotating in the cylinder 3, and a piston 4
The upper and lower open portions of the cylinder 3 are closed by an upper end plate 5 and a lower end plate 6. The cylinder 3, the upper end plate 5, and the lower end plate 6 are mutually fastened by bolts 7, and the upper end plate 5 is welded at its outer periphery to the container 1, and the entire rotary compression mechanism 2 is fixed in the container 1. Have been. The electric motor 8 includes a stator 9 fixed to the inner periphery of the container 1 by shrink fitting or welding, and a rotor 11 rotatably positioned inside the stator 9. And is fixed to an upper part of a crankshaft 12 for eccentrically rotating the piston 4 through the shaft. The crankshaft 12 is supported in the container 1 so that the crankshaft 12 can rotate stably, and has an eccentric cam 12a for eccentrically rotating the piston 4 at a lower portion. Accordingly, when the electric motor 8 drives the crankshaft 12, the piston 4 is eccentrically rotated in the cylinder 3, and the compression chamber 2 a formed by the cylinder 3, the piston 4, and a vane (not shown) rotates the piston 4. By expanding and contracting according to the position, the refrigerant is repeatedly sucked in from the inlet 13 and compressed, and discharged from the outlet (not shown).

A discharge port (not shown) discharges the discharged refrigerant to a portion of the container 1 containing the electric motor 8. The refrigerant discharged into the container 1 passes through the details of the electric motor 8 to cool the electric motor 8, and then is supplied to a refrigeration cycle device connected thereto through a discharge pipe 14 provided at the upper part of the container 1. After passing through the accumulator 15, the refrigerant having passed through the refrigeration cycle device passes through the suction pipe 1 connected to the container 1.
6. It is sucked into the cylinder 3 again through the suction port 13, and is used repeatedly thereafter.

Particularly, in the first embodiment, the crankshaft 12 is mounted on the upper end plate 5 which is the end plate of the cylinder 3 on the electric motor 8 side and on the electric motor 8 which is on the anti-rotary compression mechanism 2 side of the electric motor 8. The bearing is provided by the sub-bearing portion 17 disposed at the center.
Thus, in the conventional structure in which the rotary compression mechanism 2 and the electric motor 8 are housed in the container 1, the electric motor 8 rotates the piston 4 in the cylinder 3 in the rotary compression mechanism 2 by the crankshaft 12 eccentrically.
Thus, a bearing structure in which two motors 8 are supported at two points at two points therebetween is obtained. With such a two-point bearing structure, the crankshaft 12 is prevented from bending, and the bearing load by the end plate of the rotary compression mechanism 2 is reduced. The eccentric rotation of the piston 4 that rotates eccentrically of the crankshaft 12 can be stably supported in the immediate vicinity with one conventional bearing, so that the entire crankshaft 12 can be rotated by the rotor 1 having a large eccentric rotation of the piston 4 and a large rotational load.
1 can effectively suppress the influence of rotation and can stably support the rotor, and prevent the generation of vibration and noise even if there is an error or deviation in the manufacture or mounting position of the balance weights 18 and 19 provided on the rotor 11. be able to. Moreover, since a sufficient supporting state can be obtained only by the two-point support,
Although the auxiliary bearing portion 17 which is one of the bearing portions does not use a penetrating portion of the cylinder 3 through which the crankshaft 12 penetrates, it is not particularly necessary to provide three or more sliding bearing portions, and the friction loss increases, and The efficiency does not deteriorate, and the penetrating structure and the seal of the lower end plate 6 which is the end plate on the side opposite to the electric motor 8 can be eliminated, so that the structure is not particularly complicated or enlarged. .

The upper end plate 5 bears just below the rotor 11 of the crankshaft 12 by means of a sliding bearing 20 integrally formed at the center of the upper end plate 5. Is to be stably supported,
The upper end extends to a position higher than the lower surface position of the balance weight 19. The sliding bearing portion 20 may be provided with a structure in which a member separate from the upper end plate 5 is fitted. The sub-bearing 17 is a single member composed of a fixing member 21 fixed to the inner periphery of the container 1 by shrink fitting or welding, and a sliding bearing 22 integrally formed at the center of the fixing member 21. . However, the sliding bearing portion 22 can be provided with a structure in which a member different from the fixing member 21 is fitted.

Further, as described above, the auxiliary bearing 17 is
Provided with a fixing member 21 fixed to the container 1 in common with other devices such as the rotary compression mechanism 2 and the electric motor 8.
And the centering of the auxiliary bearing portion 17 is facilitated.

(Embodiment 2) This embodiment 2 utilizes the fact that the auxiliary bearing portion 17 for bearing the crankshaft 12 at the upper part of the electric motor 8 is not a penetrating portion of the cylinder 3 through the crankshaft 12, that is, a seal. Utilizing the position where the rolling bearing 31 is not required, the rolling bearing 31 is provided on the fixed member 21, and the crankshaft 12 is supported by the rolling bearing 31. As a result, the frictional resistance becomes smaller than in the case of the sliding bearing portion 22 as in the first embodiment, so that the efficiency of the compression mechanism is increased. In addition, the auxiliary bearing 17
Are sliding bearings 20, 32 provided with the crankshaft 12 on both the upper end plate 5 which is the end plate on the electric motor 8 side of the rotary compression mechanism 2 and the lower end plate 6 which is the end plate on the anti-motor 8 side. The three-point support structure can be realized without any problem due to an increase in frictional resistance as in the case of the above-mentioned conventional technology, and the performance can be further improved.

The upper end plate 5 has a structure provided with rolling bearings 33 arranged on the sliding bearing portion 20. As a result, the sliding bearing portion 20 bears the crankshaft 12 within a range that satisfies the seal length required for the cylinder 3, and the crankshaft 12
By adopting the above-mentioned rolling bearing 33 for another bearing length necessary for stably supporting the rolling bearing 3,
3, the frictional resistance can be reduced by the length of the bearing, and the efficiency of the rotary compression mechanism is further improved.

The other structure and the function to be performed are not particularly different from those of the first embodiment, and the same members as those of the first embodiment are denoted by the same reference numerals, and the duplicate description will be omitted.

(Embodiment 3) In the third embodiment, in the auxiliary bearing portion 17 as shown in the first and second embodiments, the oil passage portion 41 provided in the fixing member 21 is provided with oil separation. Mesh 42 is provided. in this way,
By utilizing the provision of the sub-bearing portion 17, it is possible to separate the oil accompanying the refrigerant and reduce the oil discharge amount without particularly complicating the structure.

It should be noted that other structures and functions to be performed are not particularly different from those of the first and second embodiments.
The same reference numerals are given to members common to 2 and the duplicated illustration and description are omitted.

Also, through Embodiments 1 to 3, the refrigerant
Chlorine-free hydrogen hydrocarbons and hydrocarbons are used, and even if a lubricating effect cannot be expected for the refrigerant, the support of the crankshaft is stable.
It is practically advantageous from the viewpoint of maintenance-free use.

[0029]

According to the present invention, as apparent from the above description, it is possible to obtain a bearing structure which supports two points on both sides of a portion having a rotor including the vicinity of an eccentrically rotating piston of a crankshaft. This prevents deflection of the crankshaft, and also reduces bearing load due to the end plate of the rotary compression mechanism. One end plate supporting one of the two points supports the piston that rotates eccentrically with one conventional bearing. Since the eccentric rotation can also be stably supported in the immediate vicinity, the entire crankshaft can be stably supported by the two bearing portions, thereby preventing generation of vibration and noise. Moreover, only two bearings are required,
Since the structure through which the crankshaft of the end plate on the anti-motor side of the cylinder penetrates and the necessity of sealing the penetrating part can be eliminated,
In particular, the structure does not become complicated or large, and the number of sliding bearings does not increase to three or more, so that the friction loss does not increase and the efficiency of the compressor does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a rotary compressor according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view showing a rotary compressor according to Embodiment 2 of the present invention.

FIG. 3 is a cross-sectional view showing a part of a rotary compressor according to Embodiment 3 of the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Rotary compression mechanism 3 Cylinder 4 Piston 5 Upper end plate 6 Lower end plate 8 Electric motor 9 Stator 11 Rotor 12 Crankshaft 17 Secondary bearing part 20, 22, 32 Sliding bearing part 21 Fixed member 31, 33 Rolling bearing 41 refrigerant passage part 42 mesh

Continuing on the front page (72) Inventor Kiyoshi Sawai 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 3H029 AA04 AA13 AB03 BB05 BB21 BB42 BB44 CC17 CC30 CC44

Claims (6)

[Claims] 1. A rotary compression mechanism having a cylinder closed by an end plate, a piston eccentrically rotating in the cylinder and a vane driven by the piston, and a crankshaft passing through the piston and the end plate in the cylinder. A rotary motor that is connected to an electric motor for eccentrically rotating a piston, wherein the crankshaft is provided by an end plate on the electric motor side of the cylinder and a sub-bearing portion disposed on an anti-rotary compression mechanism side of the electric motor. A rotary compressor characterized by bearings. 2. The rotary compressor according to claim 1, wherein the auxiliary bearing portion supports the crankshaft with a rolling bearing. 3. The rotary compressor according to claim 1, wherein the auxiliary bearing portion includes a fixing member fixed to a container. 4. The rotary compressor according to claim 1, wherein a mesh for separating oil is provided in the refrigerant passage portion of the auxiliary bearing portion. 5. The rotary compressor according to claim 1, wherein the bearing at the end plate includes a rolling bearing. 6. The refrigerant according to claim 1, wherein the refrigerant is a hydrocarbon-based hydrocarbon or a hydrocarbon containing no chlorine.
Item 7. The rotary compressor according to item 1.