JP3089774B2 - Hermetic compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in an air conditioner, a refrigerator and the like, and more particularly to a leg structure.

[0002]

2. Description of the Related Art The support structure of a hermetic compressor for refrigeration and air conditioning plays an important role in minimizing the transmission of vibration and noise generated by the compressor to the main body. Further, it is necessary to withstand and support the vibration of the transportation received when transporting the refrigeration / air-conditioning device to the site.

Conventionally, as shown in FIGS. 5 and 6, a supporting structure of this type of hermetic compressor is such that
02 and the end plate 103, and the leg plate 105
And a circular hole 106 is made in this block, and three to four elastic bodies 107 such as rubbers fitted into the hole support the weight of the compressor. The vibration transmitted to the substrate 108 is reduced by the elastic body such as rubber. In this leg block, the end face 109 of the leg is usually fixed by arc welding or the like to the flat portion 1 of the head plate.
04 or a method of being fixed by projection welding.

[0004]

Generally, vibrations generated from a compressor cover a wide range. In this conventional leg structure, in particular, a vibration having a frequency of 1 kHz to 2.5 kHz may cause the leg block to vibrate and radiate as noise that is easily attached to human ears. This phenomenon becomes significant when a leg with a large radiation area is attached, and when the natural frequency of the leg block is close to the above frequency. In particular, in the case of a horizontal compressor, two mounting holes are formed in the same leg block in order to increase the accuracy of mounting pitches of the leg holes, and moreover, in many cases, the mounting holes are disposed outside the projection part of the sealed container. Radiation area is large, natural frequency is 1kHz to 2.5kHz
z, and is fixed to the flat portion of the end plate that is most likely to vibrate in the sealed container of the compressor, so that the leg structure is likely to generate noise. In addition, in the conventional mounting method, as shown in FIG. 6, the leg 105 and the sealed container portion 104 are lifted at a portion slightly away from the welded portion 109 by welding or the like, and chattering noise is generated by vibration from the compressor. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Even in a leg block having a relatively large area, noise is hardly generated, and the leg block has a strength enough to withstand a shock such as transportation. It is an object of the present invention to provide a compact leg supporting structure for a hermetic compressor.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to increase the resonance frequency of the leg block and to fix the leg block in a place where the vibration of the closed container is small, and yet realize a compact support structure. In the first to third paragraphs, the joint surface end of the leg block supporting the closed container of the horizontal compressor is formed in a substantially M-shape toward the center direction of the closed container. The leg block is fixed to the cylindrical surface by projection or welding beads such as arc welding.

[0007]

[0008]

The simplest method of welding to a cylindrical surface is to weld the end face in the circumferential direction. However, this method increases the distance from the leg support point to the welding point,
The natural frequency of the leg is lower. Further, the leg is lifted by being pulled by the welded portion, and chatter is easily caused. In a method of increasing the natural frequency so that the welded portion is closer to the end of the closed vessel, the welded portion has a curved surface, so that close welding cannot be expected. Further, if the circumferential ends of the leg are welded in the axial direction, the distance from the welding point to the hole serving as the support point can be short, but the center of the leg floats and causes chatter. Furthermore, since the welding length cannot be obtained, the impact strength during transportation decreases. According to the present invention, as described above, the leg block is fixed to the circumferential surface of the sealed container toward the center of the sealed container by welding or the like in a substantially M-shape. (The effect of increasing the natural frequency), the effect of circumferential welding (the effect of securely fixing to the cylindrical surface) is exhibited at the top of the M-shape, and the center of the M-shape is Welding can be made closer to the end of the sealed container. Since the welded portion extends over the entire surface of the cylindrical bonding surface, a sufficient transport impact strength can be obtained, and the leg block comes into close contact along the cylindrical surface, thereby improving its natural frequency.

[0009]

[0010]

An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are partial bottom views of a hermetic horizontal compressor according to an embodiment of the present invention. FIG. 3 is a front view of these embodiments, and the closed container 1 comprises a cylindrical shell 2 and end plates 3 welded to both end surfaces. Inside these are electric motors (not shown)
And a compressor section (not shown). A leg block 4 is welded to a lower portion of the end plate 3. The leg block 4 has two holes 5 formed therein. As shown in FIG. 3, the flat portion 4a having the leg holes is located inside the cylindrical shell (above the outer periphery 2a of the shell), and is formed from the end surface 3a of the end plate. It is located outside. The joint to the closed container is composed of a portion 4b covering the end surface 3a of the end plate and a portion 4c covering the cylindrical surface 3b of the end plate. In the embodiment of FIG. 1, the leg block 4 is fixed to the cylindrical surface of the head plate by a welding bead by arc welding or the like. The welding bead includes a bead 6a obliquely extending from the circumferential end of the leg toward the center of the compressor. The weld bead is formed in a substantially M-shape, comprising a bead 6b in the circumferential direction and an arc-shaped bead 6c extending from the bead toward the end face of the end plate. These can be welded in one step by a welding robot or the like. On the other hand, FIG. 2 shows an example of projection welding, in which the end face 7a near the end of the leg in the circumferential direction is located 7b toward the center of the compressor from this position, and the welding point 7c is located near the end face of the end plate at the center of the leg. The end of the joint surface with the end plate 3 is substantially M-shaped.

As described above, the leg block 4 is placed on the cylindrical surface of the end plate 3 of the closed vessel 1 toward the center of the compressor.
Since the M-shaped legs 6a and 7a are almost welded in the axial direction because the M-shaped legs 6a and 7a are fixed to each other by welding or the like, the welding point can be brought closer to the leg hole 5 and the natural frequency can be increased. Further, the transport impact strength is increased. M-shaped top 6b,
In the case of 7b, welding is performed in a stable place as in the case of circumferential welding. Therefore, reliable and strong welding can be performed on the cylindrical surface of the head plate, and the effect of bringing the legs into close contact with the closed container is exhibited. Further, the M-shaped central portions 6c and 7c can be welded at a portion closer to the end of the sealed container, thereby increasing the natural frequency of the legs and preventing the central portion from floating. Since these welded portions extend over the entire surface of the cylindrical bonding surface, a sufficient transport impact strength can be obtained, and the leg blocks are brought into close contact along the cylindrical surface, thereby improving the natural frequency. Further, the shape of the main leg block is more curved than that of the conventional example, and the natural frequency of the block itself increases. FIG. 4 shows a comparison between the resonance curve of the leg of the conventional example and the resonance curve of the leg of the present invention. The broken line is a conventional example, and the solid line is one embodiment of the leg of the present invention. According to the present invention, the natural frequency is increased from around 1 kHz to 3.5 kHz.
It can be seen that the frequency has been shifted to above Hz, and the resonance level has been lowered, making it difficult to vibrate.

Further, the portion of the leg block 4 which is in close contact with the closed container 1 is a corner between the cylindrical surface 3b of the end plate 3 and the end surface 3a of the end plate, and this portion is the portion of the closed container 1 which has the least vibration. Vibration transmission to the vehicle is further reduced. Further, the welded portion is disposed at the lower portion 3b of the cylindrical surface and the leg hole portion 5 inside the cylindrical shell and outside the end plate, so that the support mount (107 in FIG. 5 of the conventional example) is mounted on the compressor. The height can be reduced, the mounting position can be closer to the compressor, and a compact support structure can be realized.

In the above-mentioned embodiment, the substantially M-shape at the end of the joining surface includes a curve, but the same effect can be obtained even if the shape is close to a concave shape.

[0014]

As described above, according to the present invention, as described above, the leg block is fixed to the circumferential surface of the closed container by welding or the like in a substantially M shape toward the center of the closed container. The natural frequency of the compressor is improved, the noise from the legs is suppressed by the vibration of the compressor, and a quiet compressor can be realized.
A sufficient transport impact strength is obtained.

[0015]

[Brief description of the drawings]

FIG. 1 is a partial bottom view of a hermetic compressor showing one embodiment of the present invention.

FIG. 2 is a partial bottom view of another embodiment.

FIG. 3 is a front view of a main part of a hermetic compressor showing another embodiment of the present invention.

FIG. 4 is a resonance curve diagram of a leg according to an embodiment of the present invention and a leg according to a conventional example.

FIG. 5 is a diagram showing a support structure of a conventional hermetic compressor.

FIG. 6 is a partially enlarged front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Cylindrical shell 3 End plate 3a End plate end surface 4 Leg block 5 Hole 6 Welding bead 7 Projection 107 Rubber mount 108 Substrate

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Sadao Kawahara 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Manabu Sakai 1006 Kadoma Kadoma, Osaka Pref.Matsushita Electric Industrial Co., Ltd. (72) Inventor Nobuyoshi Kojima 1006 Odaka Kadoma, Kadoma City, Osaka Pref. Person Shuichi Yamamoto 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-100386 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04B 39/12

Claims (3)

(57) [Claims] 1. A cylindrical horizontal hermetic container having an electric motor and a compressor section driven by the electric motor, and a leg block for supporting the hermetic container. A hermetic compressor that allows an elastic body to be mounted, and has an end portion of a joint surface of the leg block with the cylindrical portion of the hermetic container, which is formed in a substantially M shape toward the center of the hermetic container. 2. The hermetic compressor according to claim 1, wherein the end of the joint surface of the leg block and the closed container are fixed by welding beads. 3. The hermetic compressor according to claim 1, wherein the joint surface of the leg block and the sealed container are fixed by projection welding.