JP2000283039A - Sealed electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mounting workability by forming a rib in the middle part of an oil capillary in a compression element comprising the oil capillary mounted on a cylinder head and press-fitting and fixing the straight pipe part of the oil capillary located on the lower side from the rib to a communication part provided on the cylinder head. SOLUTION: A sealed electric compressor has a compression element 2 elastically supported within a sealed vessel 1, which is driven by an electric element 3. The compression element 2 is formed of a piston fitted into a cylinder, and comprises an oil capillary 6 mounted on a cylinder head 4. A rib 9 swollen to the outside is formed in the middle part of the oil capillary 6, and the straight pipe part of the oil capillary 6 located on the lower side from the rib 9 is press-fitted and fixed to a communication part 4a provided on the cylinder head 4 to allow one end thereof to communicate with the inlet space of the cylinder head 4, and the other end is extended into lubricating oil 5. According to this, the lubricating oil 5 can be sucked during operation and supplied to the compression element 2 to lubricate it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor connected to a refrigerating cycle of an electric refrigerator or the like, and particularly to a cost reduction in a structure in which an oil capillary is attached to a cylinder head and abolition of lead as an environmentally regulated substance. It is about.

[0002]

2. Description of the Related Art FIGS. 7 to 9 show the structure of a conventional hermetic electric compressor (hereinafter referred to as a compressor). In FIG. 7, reference numeral 1 denotes a closed container, 2 denotes a compression element elastically supported in the closed container 1, and 3 denotes an electric element disposed above the compression element 2. Reference numeral 4 denotes a cylinder head which constitutes a part of the compression element 2, and is fixed to one end of the compression element 2 by a bolt (not shown) or the like. Reference numeral 5 denotes a lubricating oil stored at the bottom of the closed container. An oil capillary 6 has one end extending into a suction space (not shown) of the cylinder head 4 and the other end extending into the lubricating oil 5. Since this oil capillary 6 cannot be directly press-fitted alone, a plug 7
Are joined by solder 8 and pressed into the communication portion 4a of the cylinder head 4 by applying a jig to the plug 7 and pressing, so that the tip of the oil capillary is located in the suction space of the cylinder head. is there. FIG. 8 shows a structure in which an oil capillary 6 is press-fitted into one end of a cylinder head 4 via a plug 7. FIG. 9 is a sectional view of a main part of a press-fitting portion.

[0003] In the compressor configured as described above,
During the refrigeration cycle operation, the lubricating oil is sucked up from the opening of the oil capillary 6 immersed in the lubricating oil 5 due to the pressure fluctuation difference in the suction space (not shown) of the cylinder head 4 and the suction space of the cylinder head 4 And lubricated to the compression element 2.

[0004]

SUMMARY OF THE INVENTION
In the conventional configuration, a plug 7 made of brass or the like is used to fix the oil capillary 6 to the cylinder head 4. The plug 7 is soldered 8 to the oil capillary 6 and fixed. Was press-fitted and fixed in the communication part. Fixing with this plug 7
Design strength is required such that the oil capillary 6 does not come off or loosen from the communication portion of the cylinder head 4 due to vibration during the operation of the compressor or shock during transportation. This configuration requires solder as a plug and a bonding material, and contains lead which is subject to regulation due to recent environmental problems.

Further, as alternative joining methods for lead-containing solder, there are lead-free solder (for example, tin-silver-copper) and brazing materials. However, lead-free solder is expensive and has a melting point. Since the temperature rises from 30 ° C. to 50 ° C., the welding time is prolonged, the working environment is deteriorated due to the high temperature, and the melting point of the brazing material is 700 ° C. to 80 ° C.
The temperature was extremely high at 0 ° C., and the oil capillary made of a copper material was softened, and had a problem that it was easily deformed and buckled.

An object of the present invention is to solve the above-mentioned conventional problems, and not only to reduce the number of parts and to reduce the cost due to the improvement of workability, but also to contribute to environmental conservation.

[0007]

In order to solve the above-mentioned problems, in the present invention, an outwardly projecting rib is formed at an intermediate portion of an oil capillary.

Thus, the solder and plug for fixing the oil capillary and the cylinder head can be eliminated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is provided with a rib which is formed so as to protrude outwardly from a part of an oil capillary. (Hereinafter referred to as a rib lower straight pipe portion) is pressed into and engaged with a communication portion provided at one end of the cylinder head.

According to a second aspect of the present invention, the outer diameter of the straight pipe portion below the rib, which is press-fitted into the communication portion provided at one end of the cylinder head, is tapered, and is press-fitted into the communication portion of the cylinder head. In this case, when the fitting dimension is small, the tip of the straight pipe portion below the rib is to prevent the inside of the cylinder head communicating portion from being exposed in the press-fitting step, thereby preventing generation of foreign matter.

According to a third aspect of the present invention, a locking pin that is opened in a vertical direction is sandwiched by a straight pipe portion below a rib of an oil capillary and press-fitted into a communication portion of a cylinder head. Thus, it is possible to more securely fix the oil cap in the communication portion of the cylinder head, and further reduce the generation of foreign matter due to the tip of the oil capillary at the time of insertion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a sectional view of a hermetic electric compressor according to Embodiment 1 of the present invention.
FIG. 2 shows a state in which the oil capillary 6 is press-fitted into an opening at one end of the cylinder head 4. FIG. 3 is a sectional view of a main part of this embodiment. Reference numeral 9 denotes a rib formed in the middle of the oil capillary 6 and protruding outward. A jig (not shown) for press-fitting is engaged with the rib, and a rib lower straight pipe portion 10 is provided.
Is mechanically press-fitted into the cylinder head communication portion 4a. At this time, the rib 9 comes into contact with the communication portion 4a and is automatically positioned.

(Embodiment 2) FIG. 4 is a sectional view of a main part of Embodiment 2 of the present invention, in which a rib lower straight pipe portion 11 of an oil capillary 6 has a tapered shape. The tip diameter of the portion 11 is formed smaller than the diameter of the cylinder head communication portion 4a. Therefore, the inner surface of the cylinder head communication portion 4a is not peeled off at the time of press fitting, and no foreign matter is generated. The cylinder head and the oil capillary are fixed 2 mm below the rib of the oil capillary.
Between 3 mm and 3 mm, the outer diameter of the oil capillary is larger, and the oil capillary is fixed by the binding force due to press-fitting at the larger diameter portion.

(Embodiment 3) FIG. 5 is a sectional view of a main part of Embodiment 3 of the present invention, in which a straight pipe portion below a rib of an oil capillary is formed by a locking sleeve 12 made of a spring material opened vertically. It is press-fitted into the cylinder head communication portion 4a while being sandwiched.

[0016]

As is apparent from the above embodiment, according to the first aspect of the present invention, an outwardly projecting rib is formed in the middle of the oil capillary, which is different from the conventional plug. Since they can perform the same function, conventionally, it is possible to reduce the amount of solder for joining a plug of another component and the plug to the oil capillary, thereby reducing material costs.
Furthermore, it is possible to abolish lead, which requires regulation in terms of environmental protection.

According to the second aspect of the present invention, since the shape of the straight pipe below the rib formed in the middle of the oil capillary is tapered, the tip of the straight pipe at the time of press-fitting has a cylinder head communicating portion. The generation of foreign matter due to peeling of the inner surface is prevented, and during the operation of the system, problems such as clogging of the pipe by the foreign matter and a lock state due to the foreign matter being caught in the sliding portion do not occur.

According to the third aspect of the present invention, the straight pipe portion below the rib of the oil capillary is sandwiched by the locking pin made of a spring material that is opened in the vertical direction, and is pressed into the cylinder head communication portion. Also, at the time of press-fitting, there is no galling of the inner surface of the cylinder head due to the tip of the oil capillary, and no foreign matter is generated. Further, since the oil capillary is sandwiched by the spring material, the oil capillary does not loosen due to vibration or impact, so that the structure is safer.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to a first embodiment of the present invention described in claim 1;

FIG. 2 is a perspective view of a cylinder head of the hermetic electric compressor in the embodiment.

FIG. 3 is a sectional view of an essential part of the cylinder head.

FIG. 4 is a sectional view of a main part of a cylinder head according to a second embodiment of the present invention described in claim 2;

FIG. 5 is a sectional view of a main part of a cylinder head according to a third embodiment of the present invention described in claim 3;

FIG. 6 is a perspective view of a straight pipe portion below a rib of an oil capillary according to a third embodiment.

FIG. 7 is a longitudinal sectional view of a conventional hermetic electric compressor.

FIG. 8 is a perspective view of a cylinder head in a conventional example.

FIG. 9 is a sectional view of a main part of a cylinder head in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression element 3 Electric element 4 Cylinder head 4a Communication part 5 Lubricating oil 6 Oil capillary 9 Rib 10 Rib lower straight pipe part 11 Tapered rib lower straight pipe part 12 Locking sleeve

Claims (3)

[Claims] An oil capillary provided with a compression element and an electric element in a closed container, one end of which is inserted into a suction space of a cylinder head of the compression element, and the other end of which is immersed in lubricating oil stored in the bottom of the closed container. And a rib formed at an intermediate portion of the oil capillary, wherein the oil capillary straight pipe portion on one side of the rib portion is press-fitted and fixed in a communication portion provided at one end of a cylinder head. . 2. The hermetic electric compressor according to claim 1, wherein an outer diameter of a straight pipe portion below a rib of the oil capillary inserted into a communication portion provided at one end of the cylinder head is tapered. 3. An oil capillary having a rib lower straight pipe portion sandwiched between locking sleeves opened in a vertical direction,
2. The hermetic electric compressor according to claim 1, wherein the hermetic electric compressor is inserted and fixed in a communication portion provided at one end of the cylinder head.