JPS6128066Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a hermetic electric compressor in which a compressor body is elastically supported within a hermetically sealed container, and in particular a hermetically sealed electric compressor equipped with a sound insulating member to block operational noise generated from the compressor body. This relates to a type electric compressor.

FIG. 1 shows the configuration of this type of hermetic electric compressor. In the figure, 1 is a compression element, 2 is an electric motor connected to the compression element 1 and drives the compression element 1, and 3
5 is an airtight container that elastically supports the compressor main body 4 which integrally connects the compression element 1 and the electric motor 2, 5 is a horizontal spring that elastically supports the compressor main body 4 inside the airtight container 3, and 6 is an airtight container. A lower spring 3 elastically supports the compressor body 4 at the bottom, 7 a lower spring holder, and 8 a metal plate sound insulating member attached to the inner circumferential surface of the inner cylindrical portion 3a of the closed container 3.

Generally, as the capacity of an electric compressor increases, the operating noise increases, which has a negative impact on the surrounding area. In order to prevent this, the compressor main body 4 has conventionally been supported inside the hermetic container 3 via an elastic body to prevent vibrations from being propagated to the outside, and a metal plate is attached to the inner peripheral surface of the hermetic container 3. Sound insulation member 8
were fixed by spot welding or the like to prevent operational noise from being transmitted to the outside of the sealed container 3.

However, when the sound insulation member 8 is fixed to the inner circumferential surface of the sealed container 3 by spot welding, the noise reduction effect may not always be good, and the sound insulation member cannot be removed in the case of disassembly or repair. , it is expensive because it requires special equipment such as a welding machine and a welding process.

In order to improve this, as shown in Japanese Utility Model Application Publication No. 48-94405, inwardly protruding protrusions provided on opposite edges of a sound insulating member made of a band-shaped elastic plate are brought into contact with each other. By doing so, the diameter of the sound insulating member is elastically expanded and the sound insulating member is crimped onto the inner circumferential surface of the airtight container, and a window is provided in which a projecting piece protruding from one end edge of the sound insulating member is provided near the other end edge. A hermetic electric compressor has been proposed that is fitted into a hole and caulked to one side of the window hole.

However, in this hermetic electric compressor, the protruding piece is inserted into the window hole from the outer circumferential side to the inner circumferential side of the edge on the side where the protruding piece is provided, and then plastically deformed, so that the edge of the sound insulating member is The edges overlap, creating a step in the radial direction, which creates a radial gap between the edge and the closed container, which is unfavorable in terms of sound insulation. In addition, since the protruding piece embraces one side of the window hole, the elastic diameter expansion of the sound insulating member due to the collision of the protrusions on both edges is hindered, and the sound insulating member is moved around the inner periphery of the airtight container. It is difficult to reliably press it onto the surface. Furthermore, it is necessary to insert the protrusion into the window hole and plastic deformation work by caulking the protrusion.
There was a problem in that the workability of attaching the sound insulating member to the inner peripheral surface of the sealed container was not good.

This invention solves the above-mentioned problems and prevents the creation of a radial gap between the edge of the sound insulating member made of a band-shaped elastic plate and the sealed container, and the elastic diameter expansion effect due to the collision of the protrusions. It is an object of the present invention to provide a hermetic electric compressor in which a sound insulating member can be reliably crimped onto the inner circumferential surface of a hermetic container, and the sound insulating member can be attached to the hermetic container with good workability.

An embodiment of this invention will be described below with reference to FIGS. 2 to 5.

In FIGS. 2 to 5, the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and 8a denotes both ends in the axial direction of the sealed container of the sound insulating member 8 formed of a band-shaped elastic metal plate, that is, These are protrusions provided at the upper and lower ends by being bent inward at an acute angle θ (θ<90°), and 8b is provided at the intermediate portion in the axial direction so as to protrude in the direction in which the plate surface of the sound insulating member 8 extends. It is a tapered trapezoidal claw part, and one end edge is provided with two claw parts 8b, and the other end edge is provided with one claw part 8b.
is provided in a shape and position corresponding to the portion between the claw portions 8b on one edge.

Then, the sound insulating member 8 is attached to the cylindrical portion 3a of the airtight container 3.
(See Figure 1), the protrusions 8a on both edges abut each other, and the claws 8b on both edges touch the inner circumferential surface of the sound insulating member 8 near the other edge. The claws 8b provided on the other end are engaged between the two claws 8b provided on one end. The configuration of this embodiment other than the above is the same as the conventional one shown in FIG. 1 and described above.

When the sound insulating member 8 of the embodiment configured as described above is attached to the inner peripheral surface of the cylindrical portion 3a of the closed container 3,
If the bending angle θ of the protrusion 8a is 70 degrees, the angle formed by the tips of the protrusions 8a on both ends when they collide is 40 degrees, and the sound insulating member 8 is It tries to expand its diameter elastically by its own spring pressure and is pressed against the inner peripheral surface of the closed container 3,
It comes into close contact with this inner peripheral surface. In addition, since the claws 8b on one edge are engaged with the claws 8b on the other edge, both edges do not shift in the axial direction, and the claws 8b on both edges are connected to the other end. Since it is overlapped with the inner circumferential surface of the sound insulating member 8 near the edge, the outer circumferential surface of the sound insulating member 8 is formed in a perfect circular shape without steps or protrusions. Furthermore, since the vertical length () of the sound insulating member 8 is made equal to the axial length of the straight cylindrical portion 3a of the closed container 3, the sound insulating member 8 can be prevented from moving downward.

By bringing the sound insulating member 8 into close contact with the circumferential surface of the airtight container 3 at a predetermined pressure, the operating noise of the compressor, especially its high frequency sound, can be attenuated and absorbed.

As explained above, in this invention, the sound insulating member 8 made of a band-shaped elastic plate is brought into close contact with the inner peripheral surface of the airtight container.
A protrusion 8a bent inward at an acute angle and a tapered trapezoidal claw 8b protruding in the direction of extension of the board surface of the sound insulating member are provided on opposing edges of the sound insulating member, and the protrusion 8a on both edges are placed in contact with each other. The claws 8b on both ends are overlapped with the inner circumferential surface of the sound insulating member 8 near the other end, and the claws 8b on one end along the axial direction of the sealed container are interposed between the claws 8b on the other end. Since the claws 8b provided on the edges are engaged, it is possible to provide a hermetic electric compressor that provides the following effects. That is, since the claw portions 8b on both ends are overlapped with the inner circumferential surface near the opposite edge, there is no step or protrusion on the outer periphery of the end edge of the sound insulating member 8, so that the sound insulating member 8 and the sealed container 3 and can be brought into close contact with each other in the radial direction without any gaps over the entire circumference, resulting in good sound insulation. Further, since the claw portions 8b provided on the other end edge are engaged between the plurality of claw portions 8b provided on one end edge along the axial direction, one end edge of the sound insulating member 8 and the other end edge It is possible to prevent the sound insulating member 8 from shifting in the axial direction, and also to prevent the elastic diameter expansion of the sound insulating member 8 due to the abutment between the protrusions 8a provided on both ends, and to attach the sound insulating member 8 to the inner circumferential surface of the sealed container 3. It can be crimped securely, which improves sound insulation, and since there is no need for caulking work, the claw portion 8b is tapered trapezoidal and easy to engage, and workability is improved. The sound insulating member 8 can be easily attached to the inner peripheral surface of the closed container 3.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a hermetic electric compressor equipped with a sound insulation plate, Figures 2 to 5 show an embodiment of this invention, and Figure 2 is a front view showing the state of the sound insulation member installed. FIG. 3 is a plan view of the same, FIG. 4 is an enlarged front view of the edge portion of the sound insulating member, and FIG. 5 is a plan view of FIG. 4. In the figures, the same reference numerals indicate the same or corresponding parts, 3 is a closed container, 4 is a compressor main body, 8 is a sound insulating member, 8a is a protrusion, and 8b is a claw.

Claims (1)

[Scope of utility model registration request] A hermetic electric compressor in which a compressor main body is elastically supported within a hermetic container, and a sound insulating member formed of a band-shaped elastic plate is closely attached to the inner peripheral surface of a cylindrical portion of the hermetic container,
A protrusion bent inward at an acute angle and a tapered trapezoidal claw protruding in the direction in which the plate surface of the sound insulating member extends are provided on opposite edges of the sound insulating member, forming a part in the axial direction of the sealed container. The sealed container is provided on a part of the sound insulating member, with the projections on both ends abutting each other, the claws on both ends overlapping the inner circumferential surface of the sound insulating member near the other end, and on one end. A hermetic electric compressor characterized in that a plurality of claws extending in the axial direction are engaged with a claw provided on the other end thereof.