JP2003206878A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a rotary compressor against a thermal deformation when the cylinder of a rotary compression mechanism is installed, in the rotary compressor having the rotary compression mechanism and an electric mechanism assembled in a closed container. <P>SOLUTION: The rotary compression mechanism 2 is formed by holding the cylinder 6 between an upper bearing 2a and a lower bearing 2b for supporting a rotating shaft 4 and tightening the cylinder with fixtures 7 such as bolts for integration. The mechanism is fitted to the stator 3a of the electric mechanism 3 fixed in the closed container 1 in a suspended state with bolts 14. By this, the cylinder 6 must not be shrink-fitted or welded to the closed container 1. A clearance C is held between the cylinder 6 and the closed container 1. An air gap D between the stator 3a and the rotor 3b of the electric mechanism 3 is generally uniformized through all the periphery thereof. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to improvement of a cylinder mounting structure of a rotary compression mechanism.

[0002]

2. Description of the Related Art Rotary compressors are used for compressing refrigerant gas in air conditioners such as air conditioners and refrigeration cycle devices such as refrigerators and refrigerators. In a conventional rotary compressor, for example, as shown in FIG. 3A, a rotary compression mechanism 2 and an electric mechanism 3 for driving the rotary compression mechanism 2 are incorporated in a closed container 1 (Japanese Patent Laid-Open No. 6-307363). Issue).

The electric mechanism 3 is composed of a stator 3a (stator) and a rotor 3b (rotor). A rotary shaft 4 is fixed to the rotor 3b, and an eccentric disc portion 4a is provided below the rotary shaft 4.
Is provided, and a ring-shaped roller 5 is fitted on the outer side of the eccentric disc portion 4a.

The rotary compression mechanism 2 is constructed by integrally tightening an upper bearing 2a and a lower bearing 2b for supporting the rotary shaft 4 and a cylinder 6 sandwiched between these with a stopper 7 such as a bolt. ing.

The roller 5 is eccentrically rotated while sliding along the inner peripheral surface of the cylinder 6 as shown in FIG. 3 (b), and can freely move in and out of the groove 6a of the cylinder 6 via a spring 8. The vane 9 provided on the outer peripheral surface of the roller 5 is always elastically in contact with the outer peripheral surface of the roller 5.

In the thus constituted rotary compressor, the refrigerant gas is sucked into the low pressure chamber A in the cylinder 6 through the suction pipe 10, and is compressed while being moved to the high pressure chamber B side by the eccentric rotation of the roller 5. . The refrigerant gas compressed to a high pressure is discharged into the closed container 1 through a discharge valve (not shown) provided on the upper bearing 2a, and the stator 3a.
Rises through the gap between the rotor and the rotor 3b, and the discharge pipe 11
Taken out through.

The high-pressure refrigerant gas taken out is supplied to the condenser of the refrigeration cycle. Refrigerant gas returned from the evaporator of the refrigeration cycle is collected by an accumulator (not shown) and flows into the suction pipe 10 from this accumulator. Thus, the refrigerant gas is circulated and used in the refrigeration cycle.

[0008]

In the conventional rotary compressor described above, the stator 3a of the electric mechanism 3 and the cylinder 6 of the rotary compression mechanism 2 are fixed to the closed container 1 by shrink fitting or welding. As shown in FIG. 3B, the cylinder 6 is provided with substantially fan-shaped overhanging portions 6 b on both sides, and the overhanging portions 6 b are fixed to the closed container 1. When the cylinder 6 is shrink-fitted or welded, there is a problem that the cylinder 6 is thermally distorted due to high heat at that time.

When the cylinder 6 is thermally distorted, there is a small gap between the cylinder 6 and the roller 5, which deteriorates the compression function.
Alternatively, the center lines of the upper and lower bearings 2a, 2b and the rotary shaft 4 may be displaced, causing wear, or the gap (air gap) between the stator 3a and the rotor 3b may be uneven. As a result, a problem such as a trouble occurring in the electric mechanism 3 occurs.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate the shrink fitting or welding means at the time of mounting the cylinder, and reduce the compression function due to the thermal strain of the cylinder. Another object of the present invention is to provide a rotary compressor capable of preventing wear of bearings and troubles of electric mechanisms.

[0011]

As means for achieving the above object, the present invention provides a rotary compression mechanism and an electric mechanism for driving the rotary compression mechanism in a hermetic container as claimed in claim 1. In a built-in rotary compressor, the gist of the rotary compressor is that the cylinder of the rotary compression mechanism is attached to a stator of an electric mechanism in a suspended state. A second aspect of the present invention is characterized in that a clearance is maintained between the outer peripheral surface of the cylinder and the inner wall surface of the closed container.

According to the present invention, since the cylinder of the rotary compression mechanism is attached to the stator of the electric mechanism in a suspended state, there is no need to use shrink fitting or welding means. Further, in order to maintain a clearance between the outer peripheral surface of the cylinder and the inner wall surface of the closed container, the transmission of high heat from the closed container is shut off during assembly of the compressor (such as shrink fitting or welding of the stator). There is no heat distortion. Since no thermal strain is generated in the cylinder, the centerlines of the bearing and the rotary shaft do not shift, and the air gap between the stator and the rotor of the electric mechanism is substantially uniform over the entire circumference.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a rotary compressor according to the present invention will be described with reference to the accompanying drawings.
The same reference numerals are used for the substantially same members as those in the above-mentioned conventional example. In FIG. 1, reference numeral 1 is a closed container, in which a rotary compression mechanism 2 and an electric mechanism 3 for driving the rotary compression mechanism 2 are incorporated.

The electric mechanism 3 is a motor composed of a stator 3a and a rotor 3b located inside the stator 3a. The outer peripheral portion of the stator 3a is shrink-fitted or welded to the hermetically sealed container 1. It is fixed. A rotary shaft 4 is attached to the rotor 3b, and an eccentric disc portion 4a is provided near the lower end of the rotary shaft 4.
Is provided, and a ring-shaped roller 5 is fitted on the outer side of the eccentric disc portion 4a.

The rotary compression mechanism 2 includes a cylinder 6 between an upper bearing 2a and a lower bearing 2b which support the rotary shaft 4.
It is configured by sandwiching and clamping with a plurality of fasteners 7 such as bolts. The roller 5 is located inside the cylinder 6 and rotates eccentrically together with the eccentric disc portion 4a while sliding along the inner peripheral surface of the cylinder 6.

In this case, the cylinder 6 is attached to the stator 3a of the electric mechanism 3 in a suspended state. That is, a plurality of bolt insertion holes 12 are formed in the outer peripheral portion of the stator 3a, and a plurality of screw holes 13 corresponding to the bolt insertion holes 12 are formed.
Is formed on the outer peripheral portion of the cylinder 6, and the cylinder 6 can be attached by screwing long bolts 14 inserted into the bolt insertion holes 12 into the screw holes 13, respectively. Although illustration is omitted, an insertion hole may be provided instead of the screw hole 13 of the cylinder 6, and a nut may be screwed and attached to the tip end portion of the bolt protruding from this insertion hole.
Further, a rivet method may be used.

The cylinder 6 is formed so that its outer diameter is smaller than the inner diameter of the closed container 1, and therefore, a proper clearance C is maintained between the outer peripheral surface of the cylinder 6 and the inner wall surface of the closed container 1. .

In the actual assembling process, the rotary compression mechanism 2 and the electric mechanism 3 are first integrally assembled and then the hermetically sealed container 1 is assembled.
(Specifically, the integrated body is inserted into the container body that opens upward), and the stator 3a is fixed to the closed container 1 by shrink fitting or welding as described above. Then, finally, the cap 1a is put on the upper part of the closed container 1 and the lower end peripheral portion thereof is closed.
It will be welded to and the assembly will be completed. Although the assembling process is not limited to this, it is sufficient to perform the assembling process in an order that facilitates work.

At the time of shrink fitting or welding of the stator 3a and the cap 1a, high heat is transferred to the iron-made closed container 1, but the cylinder 6 maintains the clearance C between the closed container 1 and the closed container 1 as described above. No heat is transferred because it is not in contact with the closed container 1. The cylinder 6 has a stator 3a.
The heat is slightly transferred from the through the bolt 14, but the amount of heat is extremely small and can be almost ignored. This allows
The cylinder 6 is sufficiently protected from thermal strain.

Further, since the cylinder 6 is not thermally deformed,
Upper and lower bearings 2a, 2b fixed to the cylinder 6
Also, the center line of the rotary shaft 4 does not deviate. Further, the air gap D between the rotor 3b fixing the rotating shaft 4 and the stator 3a is also substantially uniform over the entire circumference.

In the rotary compressor thus constructed, the refrigerant gas is sucked from the suction pipe (not shown) into the cylinder 6 and compressed to a high pressure as in the conventional case, and then the discharge port 15 and the through hole 16a of the cover 16 are formed. And discharged into the closed container 1. Further, the high-pressure refrigerant gas is supplied to the electric mechanism 3
Through the air gap D of to reach the upper part of the closed container 1,
It is taken out from the discharge pipe 11 and supplied to the refrigeration cycle.

FIG. 2 shows another embodiment of the rotary compressor according to the present invention. The overall structure is substantially the same as that of the above embodiment, but the bolt 14 is fitted with a cylindrical spacer 17. This is characterized by the configuration.

By using this spacer 17, it is possible to properly determine the distance between the cylinder 6 and the stator 3a when the cylinder 6 is attached. Also, all bolts 14
By fitting the spacers 17 on the cylinders 6, the horizontal positioning of the cylinder 6 can be easily performed, and the mounting work thereof can be simplified.

[0024]

As described above, according to the present invention, in the rotary compressor, since the cylinder of the rotary compression mechanism is attached to the stator of the electric mechanism in a suspended state via the fastener such as a bolt, the cylinder is hermetically sealed. Eliminates the need for shrink fit or welding to the container. As a result, it is possible to improve the compression function of the cylinder and increase the compression efficiency without causing thermal strain during mounting of the cylinder. Further, since the clearance is maintained between the cylinder and the closed container, when the stator or the cap of the closed container is shrink-fitted or welded, high heat is not transmitted to the cylinder and the cylinder can be sufficiently protected from thermal strain. Furthermore, since there is no deviation in the center line between the bearing of the rotary compression mechanism and the rotary shaft of the electric mechanism, wear does not occur, and the gap (air gap) between the stator 3a and the rotor 3b becomes uniform. It also has excellent effects such as no trouble occurring in the electric mechanism.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of a rotary compressor according to the present invention.

FIG. 2 is a schematic vertical sectional view showing another embodiment of the rotary compressor according to the present invention.

3A and 3B show an example of a conventional rotary compressor, in which FIG. 3A is a schematic vertical sectional view and FIG. 3B is a schematic horizontal sectional view taken along line XX.

[Explanation of symbols]

1 ... Airtight container 2 ... Rotary compression mechanism 2a ... Upper bearing 2b ... Lower bearing 3 ... Electric mechanism 3a ... Stator 3b ... rotor 4 ... Rotary axis 4a ... Eccentric disk part 5 ... Laura 6 ... Cylinder 7 ... Stopper 8 ... Spring 9 ... Vane 10 ... Suction tube 11 ... Discharge pipe 12 ... Bolt insertion hole 13 ... Screw hole 14 ... Bolt 15 ... Discharge port 16 ... Cover 16a ... through hole 17 ... Spacer C ... Clearance D ... Air gap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Manabu Takenaka             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Masazumi Sakaba             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F term (reference) 3H029 AA04 AA13 AB03 BB11 BB31                       BB32 BB33 BB43 BB44 CC09                       CC10

Claims (2)

[Claims] 1. A rotary compressor in which a rotary compression mechanism and an electric mechanism for driving the rotary compression mechanism are incorporated in a closed container, wherein a cylinder of the rotary compression mechanism is suspended from a stator of the electric mechanism. A rotary compressor characterized by being installed. 2. The rotary compressor according to claim 1, wherein a clearance is maintained between the outer peripheral surface of the cylinder and the inner wall surface of the closed container.