JP2000154779A - Hermetic electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce shearing force acting on a vertex of a projection part, to use a material which is weak in shearing force such as paper for a gasket and to reduce cost by forming a closed loop in a connecting part with the gasket of a head to be fixed to a cylinder and forming the projection part having a plane on the contact surface. SOLUTION: A hermetic electric compressor has a head 11 to be fixed to a cylinder having a bore hole with a bolt together with a gasket and the like. In this head 11, a suction plenum 11a and a discharge plenum 11b are formed and a projection part 11c forming a closed loop is formed in a contact part with the gasket. At this time, a vertex of the projection part 11c is formed into a plane shape, the width of the plane of this projection part 11c is made 10 to 20% of a width of a sealing surface lid of the head 11 and the height of the projection part 11c is made 10 to 50% of thickness of the gasket. As a result, shearing force acting on the vertex of the projection part 11e is reduced, the gasket made of paper can be used and reduction in cost is contrived.

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 used for an electric refrigerator, an air conditioner and the like.

[0002]

2. Description of the Related Art Conventionally, a hermetic-type compression electric compressor has been widely used
No. 4877 is known.

FIG. 6 is an exploded perspective view of a compression element portion of a conventional hermetic electric compressor, and FIG. 7 is a perspective view of a conventional head 7. The head 7 has a suction plenum 7a, a discharge plenum 7b, and a projection 7c forming a closed loop at a contact portion with the second gasket 6.

FIG. 8 shows the VIII-VI of the projection 7c in FIG.
It is sectional drawing by the II 'line. The operation of the hermetic electric compressor configured as described above will be described below. First
Gasket 2, suction lead 3, plate 4, discharge lead 5, second gasket 6, head 7
By tightening the bolt 8 into the screw hole 9, the bore hole 1
0, which are sequentially fixed to the cylinder 1 so as to prevent a refrigerant (not shown) from leaking.

[0005]

However, in the above configuration, since a large shearing force acts on the apex of the protrusion 7c of the head 7, the second gasket 6 is made of a material such as paper made of a material weak to the shearing force. Cannot be used, which has been a problem in reducing the cost of the gasket.

The present invention has been made to solve the above-mentioned conventional problems, and it is intended to reduce the shearing force acting on the apex of the projection 7c of the head 7 and to use a material weak in shearing force such as paper for the second gasket. To reduce costs.

[0007]

According to the present invention, there is provided a head having a closed loop at a contact portion of a head with a second gasket and having a projection having a flat surface at a contact surface thereof. is there.

Accordingly, the shearing force acting on the apex of the projection can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claims 1 to 3 of the present invention has a closed loop at the contact portion of the head with the second gasket and has a projection having a flat surface at the contact surface. This has the effect of reducing the shearing force acting on the apex of the projection.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hermetic electric compressor according to an embodiment of the present invention will be described below with reference to the drawings. The same reference numerals are given to the same components as those in the prior art, and detailed description thereof will be omitted. (Embodiment 1) FIG. 1 is an exploded perspective view of a compression element portion of a hermetic electric compressor according to Embodiment 1 of the present invention, and 11 is a suction plenum 11a and a discharge plenum 11.
and a head having a closed loop at a contact portion between the second gasket b and the second gasket 12 and having a flat surface at the contact surface. The second gasket is made of paper.

FIG. 2 is a perspective view of the head 11. FIG. 3 is a cross-sectional view of the protrusion 11c taken along the line III-III 'in FIG.
Reference numeral 11d denotes a sealing surface of the head 11 on which the protrusion 11c is provided, and 11e denotes a flat surface provided at the vertex of the protrusion 11c.

In the above configuration, the shear force acting on the apex of the projection is reduced, and the second gasket 12 is made of a material weak in shear force, such as paper, so that the cost can be reduced. (Embodiment 2) FIG. 4 is a cross-sectional view of a portion corresponding to FIG. 3 in Embodiment 2 of the present invention. When the width of the sealing surface 11d of the head 11 is A, the plane portion 11e at the top of the projection 11c is 0. .1 to 0.2 A in width. At this time, the width of 0.1 to 0.2A of the flat portion 11e at the apex of the protrusion 11c generates a sufficient surface pressure for sealing the high-pressure gas compressed by the hermetic electric compressor, and the surface pressure This is a value in a range that does not cause breakage of the gasket. In particular, the width of the flat portion 11e at the top of the protrusion 11c is set to 0.15.
When A, the above-described effect is the highest.

In the above-described structure, the shear force acting on the apex of the projection can be reduced, and the second gasket 6 can be made of a material weak in shear force, such as paper, to reduce the cost. (Embodiment 3) FIG. 5 is a cross-sectional view of a portion corresponding to FIG. 3 in Embodiment 3 of the present invention. When the thickness of the second gasket 12 is B, the protrusion 11 extends from the sealing surface 11d of the head 11.
The height of the vertex of c to the plane portion 11e is 0.1 to 0.5B.
And At this time, the height from the sealing surface 11d of the head 11 to the flat portion 11e of the top of the protrusion 11c is 0.1.
０．５0.5B is a value in a range where sufficient bite for sealing high-pressure gas compressed by the hermetic electric compressor is generated and the gasket is not broken by the surface pressure. In particular, the height from the sealing surface 11d of the head 11 to the flat portion 11e at the top of the protrusion 11c is set to 0.3B.
, The above-described effect is the highest.

In the above-described structure, the shear force acting on the apex of the projection can be reduced, and the second gasket 12 can be made of a material weak in shear force, such as paper, to reduce the cost.

[0015]

As is apparent from the above embodiment, according to the present invention, the contact portion between the head and the gasket forms a closed loop and the contact surface has a projection having a flat surface. Since the shearing force acting on the apex of the portion is reduced, a material that is weak in shearing force, such as paper, can be used for the second gasket, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a compression element portion of a hermetic electric compressor according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a head of the compression main part.

FIG. 3 is a sectional view taken along the line III-III ′ in FIG. 2;

FIG. 4 is a sectional view of a portion corresponding to FIG. 3 in a second embodiment of the present invention.

FIG. 5 is a sectional view of a portion corresponding to FIG. 3 in a third embodiment of the present invention.

FIG. 6 is an exploded perspective view of a compression element portion of a conventional hermetic electric compressor.

FIG. 7 is a perspective view of a conventional head.

FIG. 8 is a sectional view taken along line VIII-VIII ′ of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 1st gasket 3 Suction lead 4 Plate 5 Discharge lead 8 Bolt 9 Screw hole 10 Bore hole 11 Head 11a Suction plenum 11b Discharge plenum 11c Projection 11d Head seal surface 11e Flat surface 12 Second gasket

Continued on the front page F term (reference) 3H003 AA02 AC03 AD00 BC04 CD02 CE01 3J040 AA02 AA13 BA01 FA18 HA02 HA21

Claims (3)

[Claims] 1. A cylinder having a screw hole forming a compression element, a first gasket disposed in the cylinder,
A suction lead disposed on a side of the first gasket opposite the cylinder, a plate disposed on a side of the suction lead opposite the first gasket, a discharge lead disposed on a side of the plate opposite the suction lead, and the discharge lead A second gasket disposed on a side opposite to the plate, a head disposed on a side opposite to the discharge side of the second gasket, the first gasket, the suction lead, the plate, the discharge lead, the second gasket, A bolt that penetrates the head and is fixed to the screw hole of the cylinder;
A hermetic electric compressor comprising: a closed loop at a contact portion of the head with the second gasket; and a projection having a flat surface at a contact surface thereof. 2. A closed loop is formed at a contact portion of the head with the second gasket, and a protrusion having a flat surface having a width of 10 to 20% of the seal length of the head is provided on the contact surface. The hermetic electric compressor according to claim 1, wherein 3. The head according to claim 1, wherein a contact portion of the head with the second gasket forms a closed loop, and the contact surface has a protrusion having a height of 10 to 50% of the thickness of the second gasket. The hermetic electric compressor according to claim 1, wherein