JPH05288172A - Closed compressor - Google Patents

Abstract

PURPOSE:To enable the utilization of a small capacity closed container also as a large capacity closed container by providing the bottom part center of a lower shell with a through hole for an oil pump, and providing a bottom shell for oil reservoir additionally outward of the bottom part of the lower shell. CONSTITUTION:The closed container 19 of a large capacity scroll compressor is formed of an upper shell 11a, a lower shell 11b and a bottom shell 19a. The upper shell 11a provided with a discharge pipe 13, and the lower shell 11b provided with an inlet pipe 12 are formed by utilizing the closed container of an existing small capacity scroll compressor. A through hole 22 for an oil pump is formed at the bottom part center of the lower shell 11b, and the bottom shell 19a is made into an oil reservoir 15 so as to store lubricating oil at its inner bottom part. The existing upper shell 11a and lower shell 11b used as the small capacity closed container can be thereby utilized as a part of the large capacity closed container.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor such as a scroll compressor.

[0002]

2. Description of the Related Art FIG. 2 is a vertical sectional view of a small-capacity scroll compressor which is an example of a small-capacity hermetic compressor. In the drawing, 1 is a fixed scroll, and a spiral projection is formed on the lower surface of a base plate 1a. 1b is provided. Reference numeral 2 is an orbiting scroll, and a spiral protrusion 2b is provided on the upper surface of the base plate portion 2a. Both spiral protrusions 1b and 2b are combined, and a swing shaft portion 2c projects below the central portion of the base plate portion 2a. 3 is a suction port formed in the outer peripheral portion between the fixed scroll 1 and the orbiting scroll 2, 4 is a discharge port provided in the central portion of the base plate portion 1a of the fixed scroll 1, and 5 is both the spiral projections 1b and 2b. The compression chamber 6 formed between them is a main shaft, and an eccentric hole 6b is provided in the large diameter portion 6a at the upper end.

Reference numeral 7 denotes a rocking bearing which is arranged in the eccentric hole 6b and radially supports the rocking shaft portion 2c. Reference numerals 8 and 9 denote a rotor and a stator of a motor for driving the main shaft 6, and 10 indicates when the main shaft 6 is driven. An Oldham coupling for allowing the orbiting scroll 2 to perform an orbital motion without rotating, 11 denotes an upper shell 11a and a lower shell 11b for accommodating a compression mechanism 20 and a motor mechanism 21.
And 12 are suction pipes fixed to the lower shell 11b, 13 are discharge pipes fixed to the fixed scroll 1 and the upper shell 11a, and discharge compressed gas from the discharge port 4.

Reference numeral 14 is a partition plate, which is a cooler (not shown) in the closed container 11 when the compressor is stopped for a long period of time.
A larger amount of refrigerant enters in a saturated state, and the lower shell 11
When the lubricating oil 16 stored in the oil sump 15 of b) is dissolved and the pressure in the closed container 11 is lowered at the time of startup, the molten refrigerant is rapidly vaporized and the lubricating oil 16 is vigorously foamed. The lubricating oil 16 is prevented from being sucked into the suction port 3 together with the refrigerant gas and discharged from the discharge pipe 13, and the lubricating oil 16 in the closed container 11 is exhausted.

The operation of the above-mentioned small capacity scroll compressor is as follows.
When the rotor 8 rotates, the main shaft 6 rotates and the Oldham coupling 1
The orbiting scroll 2 revolves around 0 while being prevented from rotating. As a result, the suction gas is taken from the suction port 3 into the compression chamber 5 between the spiral projections 1b and 2b, gradually compressed, and discharged from the discharge port 4 to the discharge pipe 13.

[0006]

In the small capacity scroll compressor having the above-mentioned structure, the lower shell 11b is formed by deep drawing and the upper shell 11a is formed.
Together with this, a closed container 11 is configured, and a compression mechanism and a motor mechanism are housed in this closed container 11. This closed container 1
Since No. 1 is formed to accommodate a small capacity compression mechanism and a motor mechanism, in the case of a large capacity scroll compressor, a closed container had to be manufactured separately.

That is, FIG. 3 is a vertical cross-sectional view of a large capacity scroll compressor. Compared with the small capacity scroll compressor shown in FIG. 2, a compression chamber 5 formed by a fixed scroll 1 and an orbiting scroll 2 is shown. When the scroll compressor has a large capacity, the motor torque also increases, and the rotor 8 and the stator 9 that form the motor mechanism inevitably become large. Therefore, in terms of dimensions, the compression mechanism and the motor mechanism having a large capacity are almost the same as the respective mechanisms having a small capacity in the radial direction, but become long in the vertical direction. Therefore, the small-capacity closed container 11 cannot accommodate the large-capacity compression mechanism or the motor mechanism, and the large-capacity closed container 18, especially the lower shell 11b must be manufactured. It was

The present invention was developed in view of the above points, and an object thereof is to provide a closed container for a small capacity hermetic compressor with a hermetic container for a large capacity hermetic compressor. It is to provide a hermetic type compressor that can be used as a.

[0009]

A hermetic compressor according to the present invention is a hermetic compressor in which a fluid compression mechanism is provided in a hermetic container which is hermetically sealed by an upper shell and a lower shell. A through hole for an oil pump is provided in the center of the bottom portion, and a bottom shell for storing a lubricating oil is attached to the outside of the bottom portion of the lower shell.

Further, a fixed scroll having a spiral protrusion provided on the lower surface of the base plate portion and a discharge port provided at the center thereof and a fixed scroll having the spiral protrusion provided on the upper surface of the base plate portion in combination with the fixed scroll form a compression chamber. The compression mechanism formed of an orbiting scroll to be formed, a main shaft having an axial through hole vertically provided in the orbiting scroll, and a motor mechanism including a rotor and a stator fitted onto the main shaft are fixed to each other. It is housed in a closed container consisting of an upper shell provided with a discharge pipe connected to the discharge port of the scroll and a lower shell provided with a suction pipe for taking in suction gas, and an oil reservoir is provided at the inner bottom portion of this lower shell. In the scroll compressor, the oil pump through hole for inserting a cap provided at the lower end of the main shaft, which causes a centrifugal pump action together with the axial through hole when the main shaft rotates. , Is provided on the bottom center of the lower shell, the bottom outer side of the lower shell, is also the configuration annexed bottom shell for sump.

[0011]

According to the present invention, the conventional small-capacity closed container is provided with an oil pump through hole at the bottom of the lower shell, and an oil sump bottom shell is attached to the outside of the bottom of the lower shell. The conventional upper shell and lower shell used as the closed container of the capacity closed compressor can be utilized as a part of the closed container of the large capacity closed compressor. Further, the bottom plate portion of the lower shell is to exert the function of the conventional partition plate.

[0012]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a large-capacity scroll compressor which is an example of a hermetic compressor according to the present invention. Detailed description will be omitted for portions having the same configuration as that of the conventional example shown in FIGS. Further, the reference numerals of the common parts are the same as those of the conventional example.

As shown in the figure, the closed container 19 of this large-capacity scroll compressor includes an upper shell 11a and a lower shell 11.
b and the bottom shell 19a. This upper shell 11a provided with the discharge pipe 13 and the suction pipe 12
The lower shell 11b provided with is the closed container 11 (see FIG. 2) of the conventional small capacity scroll compressor described above.

That is, in the container sealed by the upper shell 11a and the lower shell 11b, a compression mechanism 20 including a fixed scroll 1, an orbiting scroll 2, an Oldham's joint 10 and the like formed for a large capacity, A motor mechanism 21 including a main shaft 6, a rotor 8 and a stator 9 for oscillating the orbiting scroll 2 via an Oldham's joint 10 is housed. An oil pump through hole 22 is formed in the center of the bottom of the lower shell 11b below where the main shaft 6 is located. At the lower end of the main shaft 6, the main shaft 6
A cap 23 that causes a centrifugal pump action is provided together with the axial through hole 6c formed in the main shaft 6 when rotating the main shaft 6, and the cap 23 projects downward from the oil pump through hole 22 of the lower shell 11b. Further, the bottom plate portion 11c of the lower shell 11b in which the oil pump through hole 22 is formed operates in the same manner as the conventional partition plate 14 (see FIGS. 2 and 3).

On the outside of the bottom plate of the lower shell 11b, a bottom shell 19a having a diameter substantially the same as that of the lower shell 11b and formed by shallow drawing is provided so as to cover the center of the bottom of the lower shell 11b. The bottom shell 19a serves as an oil sump 15, and the lubricating oil 16 is stored in the inner bottom thereof. This lubricating oil 16
The cap 23 described above is immersed therein. Reference numeral 25 is a mounting foot.

By constructing the large-capacity scroll compressor as described above, the conventional upper shell 11 used as the closed container 11 of the small-capacity scroll compressor.
The a and the lower shell 11b can be utilized as a part of the closed container of the large capacity scroll compressor. Further, since the bottom plate 11c of the lower shell 11b has a function as the conventional partition plate 14, it is not necessary to separately form a partition plate and provide it in the lower shell 11b as in the conventional case. Also,
Bottom shell 11 for oil sump attached to lower shell 11b
For c, a commercially available shell with a shallow drawing can be used.

Although the above embodiment is a scroll compressor, it goes without saying that the present invention can be applied to other hermetic compressors.

[0018]

As is apparent from the above description, according to the present invention, when a large capacity hermetic compressor is manufactured, a large capacity hermetic container is not newly manufactured.
Conventional small-capacity sealed containers can be used for the upper shell and the lower shell of the large-capacity sealed container. Then, a large-capacity closed container can be manufactured only by forming a through hole for an oil pump in this lower shell and attaching a bottom shell for an oil reservoir that is shallowly drawn. Therefore, the production cost of the large-capacity hermetic compressor can be further reduced as compared with the conventional case where the deep drawing lower shell is separately manufactured for large capacity. Further, as the bottom shell, a commercially available shallow drawing shell can be used, so that no mold cost is required. Also,
The bottom plate of the lower shell, which has a through hole for the oil pump,
Since it has the function of a conventional partition plate, the amount of oil can be secured, and since there is no need for a partition plate separately from the closed container as in the conventional case, the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a large capacity scroll compressor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional small capacity scroll compressor.

FIG. 3 is a sectional view of a conventional large-capacity scroll compressor.

[Explanation of symbols]

 1 Fixed scroll 1a Base plate part 1b Spiral protrusion 2 Oscillating scroll 2a Base plate part 2b Spiral protrusion 3 Intake port 4 Discharge port 5 Compression chamber 6 Main shaft 6c Axial through hole 8 Rotor 9 Stator 10 Oldham joint 11 Sealed container 11a Upper shell 11b Lower shell 11c Bottom plate part 12 Suction pipe 13 Discharge pipe 15 Oil sump 19 Closed container 19a Bottom shell 20 Compression mechanism (fluid compression mechanism) 21 Motor mechanism (fluid compression mechanism) 22 Through hole for oil pump 23 Cap

Claims (2)

[Claims] 1. A hermetic compressor in which a fluid compression mechanism is provided in a hermetic container that is hermetically sealed by an upper shell and a lower shell, wherein an oil pump through hole is provided in the bottom center of the lower shell and A hermetic compressor characterized in that a bottom shell for storing oil is attached to the outside of the bottom of the shell. 2. A fixed scroll having a spiral protrusion provided on the lower surface of the base plate portion and a discharge port at the center portion, and a fixed scroll having the spiral protrusion provided on the upper surface of the base plate portion in combination with the fixed scroll to form a compression chamber. The compression mechanism formed of an orbiting scroll to be formed, a main shaft having an axial through hole vertically provided in the orbiting scroll, and a motor mechanism including a rotor and a stator fitted onto the main shaft are fixed to each other. It is housed in a closed container consisting of an upper shell provided with a discharge pipe connected to the discharge port of the scroll and a lower shell provided with a suction pipe for taking in suction gas, and an oil reservoir is provided at the inner bottom portion of this lower shell. In a scroll compressor consisting of an oil pump through hole for inserting a cap provided at the lower end of the main shaft, which causes a centrifugal pump action together with the axial through hole when the main shaft rotates, A hermetic compressor, characterized in that it is provided at the center of the bottom of the lower shell, and a bottom shell for storing oil is attached to the outside of the bottom of the lower shell.