JPS6116287A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent a cylinder from being deformed upon encasing of a compression mechanism in a closed vessel, by providing a plate section to a leg section secured to the closed vessel, having a thickness which is larger than the axial thickness of the leg section, and by securing a cylinder block to this plate section. CONSTITUTION:A compression mechanism 4 is encased in a closed vessel 2. The compression mechanism 4 is formed such that a cylinder plate 7, a side plate 9, etc. are attached to a plate section 5a having a thickness larger than the axial thickness of an attaching leg section 5b which is secured to the vessel 2 and which is integrally incorporated with the plate section 5a. Between the cylinder plate and the attaching leg section, there is defined a space 5 having a distance l2 which is greater than the axial thickness l1 of the attaching leg section by at least 30% of the latter, and therefore, stress which is brought about when the attaching leg section is secured to the closed vessel can be hardly transmitted to the plate section so that it is possible to prevent the cylinder from being deformed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in refrigeration equipment such as refrigerators and air conditioners.

Structure of the conventional example and its problems ゛As shown in Fig. 3, the conventional rotary compressor includes an electric motor part B and a compression mechanism part C in a sealed case A. After press-fitting into the sealed case A into the radially extending part in the same plane as the
A fixing portion D2 that is fixed by welding is formed. Therefore, due to the stress received from the fixed part D2 during fixation, distortion occurs in the cylinder mounting part D1, which is transmitted to the cylinder F and the bearing D3, causing the vane G to lock, and the cylinder F.
In addition, there was a problem in that the bearing D3 was distorted and the proper clearance between the parts forming the compression chamber was disturbed, resulting in failure to achieve the desired performance and efficiency.

In order to avoid this, there is a bearing in which a U-shaped part for strain absorption is provided in the bearing, as shown in Japanese Utility Model Publication No. 55-22212. In this case, the air gap of the motor changed, producing magnetic noise during operation, causing high noise and instability. In addition, the rigidity of the bearing becomes weaker, and the crankshaft whirls around due to the unbalance of the crankshaft, which causes the bearing to vibrate, causing the bearing to make a loud noise at its own frequency, increasing the noise and vibration of the entire compressor. Ta.

Purpose of the Invention The present invention provides a predetermined distance between a part that requires precision in performing compression and a mounting leg of a bearing plate that is required to be strongly connected to the sealed case of the compressor and to provide rigidity to the sealed case. and separate it in the axial direction from the motor side, and
The bearing itself has strong rigidity to reduce the noise of the bearing.
The purpose is to increase the vibration damping rate and to have a compact structure made of one part.

Structure of the Invention To achieve this object, the present invention provides a bearing plate in which the above-mentioned precision-required part and the above-mentioned strength-required part are separated from each other by a distance of at least 30% or more of the width of the mounting leg. Direction 1 Separated from the motor side, the bearing plate should be installed in the parts that require the above-mentioned accuracy so that no distortion occurs during operation and when the compressor is operated, and the parts that need the above-mentioned strength should have sufficient strength and rigidity. By increasing the rigidity of the bearing, the sealed case, and the bearing itself, noise can be reduced, and these are all made into one compact component.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rotary type compressor main body, and an electric motor section 3 and a rotary type compression mechanism section 4 are integrated and housed in a sealed case 2. As shown in FIG. 3a is a stator of the electric motor, which is press-fitted into the sealed case 2 and fixed thereto. 3b is a rotor. Reference numeral 6 denotes a main bearing portion 5C that pivotally supports the crankshaft 6 press-fitted into the rotor 3b, a mounting leg portion 5b for integrally attaching it to the sealed case 2, and a cylinder plate 8 to be described later.
, a vane 12, a side plate 9, etc. are attached to define a compression chamber 11, and a plate portion 6a that requires high precision is integrated with the main bearing plate.

Furthermore, the plate portion 6a and the mounting leg portion 6b have a mounting leg width of 11
They are spaced apart in the axial direction by a distance of at least 30%.

After the main bearing plate 6 is lightly pressurized to the closed case 2, the mounting leg portion 6b is fixed to the closed case 2 by welding 50 or the like. Reference numeral 7 denotes a cylinder plate that accommodates a rotary piston 8 provided on the eccentric portion 6b of the crankshaft 6. 9 is a side plate that integrally has a bearing 9a that pivotally supports the crankshaft 6, and has a gas discharge hole (not shown) and a discharge pulp (not shown).
(not shown).

The main bearing plate 5, cylinder plate 7, and side plate 9 are integrated by a pole 10 to define a compression chamber 11. 12 refers to the compression chamber 11 as the high pressure side;
A vane 12a is a vane spring that divides the pressure side into a low pressure side. Reference numeral 13 denotes an oil pump, which has an oil pump mechanism inside that rotates integrally with the crankshaft 6.

14 is oil.

In such a configuration, the leg width 11 is 101+II+
1. The case where the plate distance 12 is set to five days will be explained. When the mounting leg 5b of the main bearing plate 5 is lightly press-fitted into the sealed case 2 and further welded to the sealed case 2 at several places, the mounting leg 6b receives a large compressive load, causing distortion and changing its shape. Although deformation occurs in the plate portion 5a, the amount of this distortion applied to the plate portion 5a is negligible. improved, and noise was reduced.

The results are summarized in the table below.

That is, compared to the conventional example in which the dimension of the plate portion 6a is 0 and 7, in this example, both the press-fitting strain and the operating strain are reduced to ¥,
The noise at 500) h also decreased from 42 dB to 34 dB.

In the above example, 12=5rR1n, and 72/71=5
Although it was set to 0%, it was found that an effect equivalent to +tx can be obtained by increasing l2/121 to at least 3a% or more.

Therefore, by selecting l 2 /l to an appropriate value of 3C or higher, which avoids unnecessary femininization, bearing distortion can be suppressed and noise can be reduced.

Effects of the Invention As described above, the present invention allows the main bearing plate to have at least 30 mm of the width of the mounting leg without bringing the plate portion defining the compression chamber and the mounting leg fixed to the sealed case into close contact with each other.
% or more, and the bearings are integrally formed. As a result, distortion caused by fixation of the mounting legs does not occur in the plate portion, which requires precision. Also, since the bearing is rigid enough to withstand the force applied to the crankshaft, no distortion occurs on the plate surface. Therefore, there is no adverse effect due to bearing distortion, and the compressor can operate normally and exhibit the specified performance and efficiency.

In addition, the mounting legs, which require strength, can have sufficient strength, and when fixed to the inner surface of the sealed case, the rigidity of the sealed case can be increased. A compressor with low operating noise can be obtained by suppressing generated vibrations.

Furthermore, since the bearing plate is made up of one component, it is easy to process and assemble.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of a rotary compressor showing an embodiment of the present invention, Fig. 2 is a perspective view of the main bearing plate of the compressor, and Fig. 3 is a conventional example. It is a sectional view of the main part of the machine. 5. Main bearing plate, 5a...Plate part, 5b...Mounting leg part, 5C...Main bearing part,
7...Cylinder play 1-. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure ρ2 Figure 2 Evening 1 Figure 3

Claims (1)

[Claims] A closed case that integrally houses a compression mechanism section and an electric motor section, a crankshaft driven by a rotor of the electric motor section, a mounting leg whose peripheral edge is fixed to the closed case, and the crank. A main bearing having a main bearing that supports the shaft, and a compression chamber that is integrated with the bearing and is located away from the leg in the direction of the bearing on the side opposite to the motor by a distance of at least 30% of the width of the leg. A rotary compressor with a plate section that defines a