JP2002054564A - Refrigerant compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant compressor capable of solving such a problem that the dimensions of a cylinder end face and a piston top are much different from the top clearance dimensions required for the performance by the combination of variations in the dimensional accuracies of the parts forming a compressor part in this refrigerant compressor comprising a body 4 integrally formed with a cylinder 2 and a bearing 3 forming the compressor part 1 forming a cantilever bearing structure a piston 5 reciprocating in the cylinder 2, and a connecting rod 10 for connecting the eccentric part 8 of a rotating shaft 7 to the piston 5 through a piston pin 6. SOLUTION: Eccentric bushes having different axes of outer and inner diameters are used for the rotating shaft side connecting rod large ring part of the compressor part to adjust the top clearance dimensions. Thus, the specified top clearance dimensions can be provided easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating refrigerant compressor for use in refrigerators and the like, and more particularly, to a cantilever bearing structure using a main body integrally provided with a cylinder and a main body having a bearing for holding a rotating shaft. The present invention relates to a refrigerant compressor constituting the compressor section of the above.

[0002]

2. Description of the Related Art In a refrigerant compressor in which a cylinder and a main body having a bearing for holding a rotating shaft are formed as separate parts, and a refrigerant compressor fastened and fixed by bolts, a top clearance dimension of a piston, which affects volumetric efficiency, is determined by the performance. In order to manufacture the cylinder within the specified management width required from the surface, the cylinder is temporarily fixed with bolts, the dimensions of the end face and the piston top are measured, and the cylinder is mounted so that the predetermined top clearance dimension is obtained. After adjusting the position, the bolts were fully tightened and fixed.

[0003] In the refrigerant compressor having such a structure, the impact between the cylinder and the main body may be displaced due to an impact applied during a manufacturing process or during transportation, and the original performance may not be exhibited. A refrigerant compressor having a cantilever bearing structure using a main body 4 integrally provided with a cylinder 2 and a bearing 3 constituting a compressor section 1 as shown in the figure is adopted.

[0004] As a refrigerant compressor of this cantilever bearing structure,
After assembling a piston 5 reciprocating in the cylinder 2 and a connecting rod 10 for connecting the eccentric portion 8 of the rotary shaft 7 to the piston 5 via a piston pin 6, the connecting rod on the eccentric portion 8 side is connected. It has been known that a bush 19 is press-fitted and fixed to ten large wheels to form a compressor section.

[0005]

However, in a refrigerant compressor using a main body integrally provided with a cylinder and a bearing, the dimensional accuracy of the components constituting the compressor unit described above is combined, so that the cylinder is not suitable. The dimensions of the end face and the piston top greatly deviated from the dimensions within the specified top clearance management width required from the performance aspect, and the top clearance dimension was shifted to the larger one to prevent the piston from hitting the top. This, inevitably, degrades refrigeration capacity characteristics and efficiency.

Therefore, parts such as gaskets of various thicknesses are prepared so that the top clearance dimension is a predetermined control dimension, and selected from these to be used between the cylinder end face and the valve seat plate. It is necessary to assemble by hand, and there are problems such as an increase in the number of parts for maintaining the top clearance dimension and an increase in labor for selective use.

The present invention provides a refrigerant compressor in which these problems have been improved.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a motor unit and a compressor connected to the motor unit via a rotary shaft in a closed container storing refrigerating machine oil. In the refrigerant compressor, the rotation axis of the compressor section is arranged in the vertical direction, the rotating shaft side connecting rod large wheel of the compressor section, an eccentric bush whose outer diameter and inner diameter are different. With the provision, the top clearance dimension is adjusted.

According to a second aspect of the present invention, the eccentric bush is formed with a positioning portion in the maximum direction or the minimum direction of its thickness, thereby positioning the bush in the eccentric direction.

According to a third aspect of the present invention, the eccentric bush uses an iron-based sintered material, so that the eccentric shape of the bush and the shape of the positioning portion in the eccentric direction can be easily formed.

According to a fourth aspect of the present invention, the amount of eccentricity of the eccentric bush is 50 μm to 150 μm, so that the amount of adjustment of the top clearance dimension is ensured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a refrigerant compressor according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the internal structure of a refrigerant compressor according to one embodiment of the present invention.
In the figure, reference numeral 21 denotes a hermetically sealed container, in which an electric motor 22 arranged below the inside thereof and a compressor section 1 driven by the electric motor 22 via a rotary shaft 7 are provided above.
The compressor unit 1 converts the rotational movement of the eccentric part 8 provided on the rotating shaft 7 into a reciprocating movement of the piston 5 via the connecting rod 10 and the piston pin 6 so that the piston 5 reciprocates in the cylinder 2. Is configured.

A discharge muffler 24 is provided on an end face of the cylinder 2 via a valve seat plate 23, and a refrigerant gas suction and discharge path is formed. Further, a refrigerator oil 15 for lubricating a sliding portion of the compressor unit 1 and a sliding portion of the rotating shaft 7 and the bearing 3 for driving the compressor unit 1 is stored at the bottom of the closed container 21.
The centrifugal pump 16 provided at the lower end of the rotating shaft 7 pumps up the refrigerating machine oil 15, first supplies oil to a sliding portion with the bearing 3, and further provides an oil supply hole provided in the inner diameter of the rotating shaft 7 and the eccentric portion 8. 1
The oil is supplied to the compressor unit 1 located at the upper side through 8.

Here, the assembling procedure of the compressor section 1 constituting the present refrigerant compressor is as follows. First, the rotating shaft 7 is mounted on the main body 4 integrally provided with the cylinder 2 and the bearing 7, and the piston 5 and the connecting rod 10 are connected to each other. The piston 5 part of the piston connecting rod connection 11 assembled through the piston pin 6 is inserted into the cylinder 2 and rotated about the axis of the cylinder 2, and the eccentric part 8 of the rotating shaft 7 is attached to the large wheel part of the connecting rod 10. The bush 14 is press-fitted into this large wheel portion.

FIG. 2 shows an assembled state of the compressor section 1 according to an embodiment of the present invention, wherein (a) shows an assembly dimension measurement, and (b) shows an installation of an eccentric bush. In the figure, reference numeral 2 denotes a cylinder, which shows a plane cross section at the center axis position.

In this embodiment, when the bush is press-fitted in the above-described assembling procedure, a master bush 14a having a coaxial inner and outer diameter is inserted into the large wheel portion of the connecting rod 10 as shown in FIG. 2 and the top surface of the piston 5 are measured, and the eccentric bush 14 is pressed into the large wheel portion of the connecting rod 10 by rotating the eccentric bush 14 at a predetermined angle as shown in FIG. The top clearance dimension B obtained from the difference between the thickness C and the thickness D of the bush can be obtained.

Thus, the gasket conventionally required for obtaining a predetermined top clearance dimension can be eliminated, and a low-cost, high-performance refrigerant compressor can be provided.

FIG. 3 shows the appearance of an eccentric bush according to an embodiment of the present invention. In FIG. 3, (C) shows a concave portion 17 which is a U-shaped groove formed in the minimum direction of the thickness of the eccentric bush. (D) shows an example in which the hole 18 is formed so as to penetrate in the maximum thickness direction of the eccentric bush to form the positioning portion.

The formation of the concave portion 17 or the hole 18 serves as positioning in the eccentric direction in performing eccentric processing at the time of manufacturing the bush, and when press-fitting and fixing to the connecting rod large wheel portion in assembling the compressor portion. In addition, a refrigerant compressor that can be used as a position for determining an eccentric direction for obtaining a predetermined top clearance dimension and has high productivity can be provided.

The shape of the positioning is not limited to the above-mentioned hole or the U-shaped groove. The presence or absence of the hole and the position of the hole may be set to the end face side. The same effect can be obtained even if it is formed with a dimple or the like.

Further, by using an iron-based sintering material as a material used for the eccentric bush, the material price can be reduced. By forming by heating and sintering, the cost can be reduced in terms of production, and a low-cost refrigerant compressor can be provided.

The material used for the eccentric bush is not limited to the iron-based sintered material described above, and the same effect can be obtained by using a non-ferrous sintered bearing material. Therefore, it may be used as a so-called wound bush in which a non-ferrous sintered bearing material is formed on an iron back metal.

Further, by combining a main body including a cylinder and a bearing constituting a compressor section, a piston, a piston pin, a connecting rod, and a rotating shaft, the range of dimensional accuracy variation reaches 100 μm or more. In the eccentric bush of the present invention, by setting the amount of eccentricity of the bush to 50 μm to 150 μm, it is possible to secure an adjustment amount for obtaining an ideal top clearance dimension, and the top clearance dimension is too large. It is possible to suppress a decrease in performance.

Further, since it is not necessary to use a gasket or the like that causes a change in plate thickness, the top clearance dimension can be made as small as possible, and a refrigerant compressor with high performance and high reliability can be supplied.

[0025]

As described above, according to the first aspect of the present invention, an electric motor unit is provided in a closed container storing refrigerating machine oil.
A compressor unit connected to the motor unit via a rotating shaft,
In the refrigerant compressor arranged with the rotation axis set in the vertical direction, the rotation shaft side connecting rod large wheel of the compressor unit is provided with an eccentric bush whose outer diameter and inner diameter are different. The top clearance dimension can be adjusted, and the gasket conventionally required to obtain a predetermined top clearance dimension can be eliminated.

According to the second aspect of the present invention, the eccentric bush is formed with a positioning portion in the maximum direction or the minimum direction of its thickness, thereby positioning the bush in the eccentric direction. And the assemblability of the refrigerant compressor can be improved.

According to the third aspect of the present invention, since the eccentric bush uses an iron-based sintered material, the eccentric shape of the bush and the positioning portion in the eccentric direction can be easily formed. Lower prices are possible.

According to the fourth aspect of the present invention, the amount of eccentricity of the eccentric bush is in the range of 50 μm to 150 μm, so that the adjustment amount of the top clearance dimension can be ensured, and the deterioration of performance is suppressed. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the internal structure of a refrigerant compressor according to an embodiment of the present invention.

FIG. 2 is a diagram showing an assembled state of a compressor unit according to one embodiment of the present invention.

FIG. 3 is a view showing the appearance of an eccentric bush according to an embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing the internal structure of a conventional refrigerant compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor part 2 Cylinder 4 Body 5 Piston 7 Rotation axis 8 Eccentric part 10 Connecting rod 11 Piston connecting rod connection 14 Eccentric bush

 ──────────────────────────────────────────────────の Continuing on the front page (72) Kentaro Yamaguchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Hiroyuki Matsumori 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Nobuo Komoto 2-5-5 Sanyo Electric Co., Ltd., Moriguchi-shi, Osaka 2-72 Sanyo Electric Co., Ltd. 2-5-5, Sanyo Electric Co., Ltd. F-term (reference) 3H003 AA02 AB03 AC03 AD01 CB02 3J033 AA05 AC01 GA01

Claims (4)

[Claims] 1. A refrigerant in which an electric motor section and a compressor section connected to the electric motor section via a rotary shaft are arranged in a closed container storing the refrigerating machine oil, with a rotation axis centered in a vertical direction. The compressor according to claim 1, wherein the connecting-wheel large wheel on the rotating shaft side of the compressor unit includes an eccentric bush whose outer diameter and inner diameter are different from each other. 2. The refrigerant compressor according to claim 1, wherein a positioning portion is formed in the eccentric bush in a maximum direction or a minimum direction of a thickness thereof. 3. The refrigerant compressor according to claim 1, wherein the eccentric bush is made of an iron-based sintered material. 4. An eccentric amount of the eccentric bush is 50 μm.
The refrigerant compressor according to any one of claims 1 to 3, wherein the diameter of the refrigerant compressor is from 150 to 150 m.