JP2002349441A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor advantageous in terms of compressive strength for an internal high pressure-type one by integrating a bottom surface of a lower cover of a hermetic container with legs and forming the bottom surface, which is exposed to internal pressure, into a spherical shape. SOLUTION: This hermetic compressor comprises a compression section 5 compressing refrigerant and a motor 6 driving the compression section 5 disposed in the hermetic container 1 composed of a cylindrical body 2 having upper and lower openings and dish-like upper and lower covers 3, 4 blocking the openings of the body 2. The lower cover 4 is formed into a spherical surface R with a center on the central axis of the body 2 and constituted of a vertical section 4a having a periphery smoothly connected to the spherical surface R and bonded to a lower peripheral surface of the body 2, a flat section 4b connected to the vertical section 4a and horizontally bent outwards, a folded section 4c vertically folded back from the flat section 4b downwards, and an attachment section 4d connected to the folded section 4c to horizontally extend outwards and attached to a base. A joint part of the peripheral surface of the body 2 with the upper end of the vertical section 4a is bonded by all-around welding a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor, and more particularly to a structure of a lower lid of a hermetic container which is advantageous in terms of pressure resistance for an internal high-pressure compressor.

[0002]

2. Description of the Related Art As a conventional hermetic compressor of this type, there is, for example, one shown in FIGS. In FIG. 4, reference numeral 21 denotes an airtight container. The airtight container 21 includes a cylindrical body 22 having an upper and lower opening, and an upper lid 23 which is fitted into an upper opening of the body 22 and closes the upper opening. And a dish-shaped lower lid 24 that is fitted into the lower opening and closes the lower opening. The body 22 and the upper lid 23 and the lower lid 24 are each fitted with a fitting portion. Along with the welding a.

In the closed vessel 21, a compression section 25 for vertically compressing the refrigerant and an electric motor 26 for driving the compression section 25 are disposed. The compression section 25 includes a spiral fixed scroll 27,
A plurality of compression chambers mesh with each other with the fixed scroll 27.
An orbiting scroll 29 forming a shaft 28; a shaft 30 for transmitting the rotational force of the electric motor 26 to the compression unit 25;
It is mainly composed of a main frame 31 that supports the 30. The compression section 25 includes a suction pipe connected to the motor chamber 26a.
A low-pressure refrigerant gas is sucked through a gas passage (not shown) from 32 and a compression process is performed to compress the gas into a high-temperature and high-pressure gas. ) To discharge refrigerant gas to the refrigeration cycle.

[0004] The lower lid 24 has a dish-shaped bottom portion 24a,
A flat portion 24b connecting the outer peripheral portion to the bottom portion 24a and joining to the lower end surface of the body 22; a vertical portion 24c extending vertically upward from the flat portion and joining to the lower outer periphery of the body 22; Horizontal part 24d connected to the vertical part 24c and bent horizontally outward
And the base portion 24 which is vertically turned down from the horizontal portion 24d.
e, which are press-formed together, and the joint between the lower outer peripheral surface of the body 22 and the upper end of the vertical portion 24c is joined by full-circumferential welding a. This compressor is of an internal low-pressure type in which the electric motor room 26a has a low pressure.

FIG. 5 shows another conventional example, in which a lower lid 24 'has a dish-shaped bottom portion 24a' and an outer peripheral portion having the same bottom portion 24a '.
A horizontal portion 24b ', which is horizontally bent outward, and a vertical portion 24c', which is vertically folded downward from the horizontal portion 24d 'and joined to the lower inner peripheral surface of the body 22', and a vertical portion 24c ' Connected to the torso
22 ', and a base portion 24e' extending vertically downward from the flat portion 24d ', and these are integrally press-formed to form a lower outer peripheral surface of the body 22'. The joining portion with the flat portion 24d 'is joined by the entire circumference welding a.

In the above configuration, the lower lids 24, 24 'are integrated with the bottom portions 24a, 24a' and the base portions 24e, 24e ', which is advantageous in cost. However, in the above configuration, since the lower lids 24 and 24 'are flat dish-shaped, the pressure of the motor chamber 26a is applied substantially evenly to the central portion and the outer peripheral portion. Also,
Flat portion 24b (FIG. 4) and horizontal portion 24b '(FIG. 5) at the outer periphery
Receives the internal pressure on the horizontal plane, so the pressure resistance strength becomes weaker to the outside. For this reason, it is good for an internal low-pressure type hermetic compressor, but the internal high-pressure type has a problem in pressure resistance.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and integrates a bottom portion of a lower lid of a closed container with a leg portion and forms a bottom portion receiving an internal pressure into a spherical shape. Accordingly, an object of the present invention is to provide a hermetic compressor that is advantageous in terms of pressure resistance even in the case of an internal high pressure type.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a cylindrical body which opens up and down, a dish-shaped upper lid and a lower part which close the opening of the body. In a hermetic compressor including a compression section that compresses a refrigerant and an electric motor that drives the compression section inside a closed container formed by a lid, the lower lid is located at the center of the body. A vertical part which is formed into a spherical shape having a center on the axis and smoothly connects the outer peripheral part to the spherical part, and is joined to the lower outer peripheral surface of the body, and is horizontally bent outwardly connected to the vertical part. A flat portion, a folded portion vertically folded down from the flat portion, and a mounting portion connected to the folded portion and horizontally extending outward and attached to a base, the outer peripheral surface of the body And the joining portion between the upper end of the vertical portion and the upper portion is welded by full circumference welding. That.

Further, both the joint portion of the body and the lower lid are formed in a cylindrical shape.

[0010] Further, a taper is provided outside the lower part of the body and / or inside the upper end of the vertical part.

Further, the mounting portion is formed in a substantially rectangular shape in a top view.

Further, the four sides of the substantially rectangular mounting portion are provided with legs bent vertically downward, and these are integrally press-formed.

[0013]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of a hermetic compressor showing an embodiment of the present invention, and FIG. 2 is an enlarged top view of a main part of a lower lid. In the figures, reference numeral 1 denotes a closed container, and the closed container 1 has a cylindrical body 2 having an upper and lower opening, and a dish-shaped upper lid which is fitted into an upper opening of the body 2 and closes the upper opening. 3 and a dish-shaped lower lid 4 fitted into the lower opening and closing the lower opening. The body 2 and the upper lid 3 and the lower lid 4 are fitted respectively. It is joined by welding a along the joint.

A compression section 5 for vertically compressing the refrigerant and an electric motor 6 for driving the compression section 5 are provided in the closed container 1. The compression section 5 includes a spiral fixed scroll 7,
An orbiting scroll that meshes with the fixed scroll 7 to form a plurality of compression chambers (not shown);
, And a main frame 9 that supports the shaft 8. The compression unit 5 sucks the refrigerant gas from the suction pipe 10 to perform a compression process, compresses the gas into a high-temperature and high-pressure gas, fills the discharge chamber 11 with the compressed gas, and connects the The flow of the chamber 6a and the pressure of the electric motor chamber 6a are increased, and the refrigerant gas is discharged from the discharge pipe 12 to the refrigeration cycle.

The lower cover 4 is formed in a spherical shape R having a center on the center axis of the body 2 and has an outer peripheral portion smoothly connected to the spherical portion R, and is formed on a lower outer peripheral surface of the body 2. The vertical portion 4a to be joined, the flat portion 4b connected to the vertical portion 4a and bent horizontally outward, the folded portion 4c vertically folded downward from the flat portion 4b, and the flat portion 4c connected to the folded portion 4c And a mounting portion 4d extending horizontally outward and attached to a base (not shown). A joining portion between a lower outer peripheral surface of the body 2 and an upper end of the vertical portion 4a is formed by full-circle welding a. It has a joined configuration.

The mounting portion 4d is formed in a substantially rectangular shape,
A screw hole b for fixing the base with screws or the like is provided at the corner, and a vibration isolator can be fitted into the screw hole b. Further, in order to increase the strength of the mounting portion 4d, legs 4e which are bent vertically downward at four sides are provided, and these are integrally press-formed to reduce the number of parts.

The lower part of the body 2 and the lower lid 4
Are joined to the vertical portion 4a by press-fitting. The height h of the vertical portion 4a is set to a sufficient height in consideration of melting during welding and mixing of spatter.

FIGS. 3A and 3B show another embodiment of the present invention. FIG. 3A shows a case where a taper c is formed on the outside of the lower portion of the body 2, and FIG. B) has a tapered d inside the upper end of the vertical portion 4a of the lower lid 4,
Thereby, the welding a can sufficiently enter the tapered portion, and the joining strength between the body 2 and the lower lid 4 can be increased.

In the above structure, the lower lid 4 has a portion receiving the internal pressure of the sealed container 1 formed in a spherical R shape, and a vertical portion 4 a joining an outer peripheral portion to a lower outer peripheral surface of the body 2. A flat portion 4b connected to the vertical portion 4a, a folded portion 4c vertically folded down from the flat portion 4b, a mounting portion 4d connected to the folded portion 4c, and legs bent vertically down to four sides. 4e, and press-molding them together, and joining the joint between the lower outer peripheral surface of the body 2 and the upper end of the vertical portion 4a by full-circle welding a
It is possible to secure sufficient pressure resistance with respect to the internal high-pressure type compressor, reduce the number of parts, improve reliability, and provide a cost-effective hermetic compressor.

[0020]

As described above, in the present invention, the pressure resistance of the lower lid can be sufficiently secured for the internal high-pressure type compressor, the number of parts can be reduced, and the reliability can be improved. Thus, the hermetic compressor is advantageous in cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hermetic compressor showing an embodiment of the present invention.

FIG. 2 is an enlarged top view of a main part of a lower lid according to the present invention.

FIG. 3 is a cross-sectional view of a principal part showing another embodiment of the present invention;
(A) is a tapered lower body, and (B) is a tapered upper end of a vertical portion of a lower lid.

FIG. 4 is a sectional view of a hermetic compressor showing a conventional example.

FIG. 5 is a sectional view of a main part of a hermetic compressor showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Body 3 Upper lid 4 Lower lid 4a Vertical part 4b Flat part 4c Folding part 4d Mounting part 4e Leg 5 Compression part 6 Electric motor 7 Fixed scroll 8 Shaft 9 Main frame a Welding R Bottom part

Claims (5)

[Claims] 1. A compression unit for compressing a refrigerant in a closed container formed of a cylindrical body having an upper and lower opening, a dish-shaped upper lid and a lower lid closing an opening of the body. And a motor for driving the compression unit, wherein the lower lid is formed in a spherical shape having a center on a center axis of the body, and an outer peripheral portion is formed in the spherical portion. Vertically joined smoothly to the lower outer peripheral surface of the body, a flat portion connected to the vertical portion and horizontally bent outward, and a folded portion vertically folded downward from the flat portion, It is composed of an attachment portion connected to the folded portion and extending horizontally outward and attached to the base, and a joining portion between the outer peripheral surface of the body and the upper end of the vertical portion is joined by full circumference welding. A hermetic compressor. 2. The hermetic compressor according to claim 1, wherein both a joint portion of the body and the lower lid are formed in a cylindrical shape. 3. The hermetic compressor according to claim 1, wherein an outside of the lower portion of the body and / or an inside of an upper end of the vertical portion are tapered. 4. The hermetic compressor according to claim 1, wherein the mounting portion has a substantially rectangular shape in a top view. 5. The hermetic seal according to claim 1, wherein legs which are bent vertically downward are provided on four sides of the substantially rectangular mounting portion, respectively, and these are integrally formed by press forming. Type compressor.