JPH0114431B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration suppressing device for preventing resonance in a discharge pipe of a hermetic electric compressor.

[Conventional technology]

In a hermetically sealed electric compressor in which the compressor section and the motor section are connected and housed in a sealed container, when the natural frequency of the discharge piping and the pressure pulsation frequency of the discharge gas flowing inside the discharge piping match, a resonance phenomenon occurs in the discharge piping. This will not only increase vibration and noise, but in severe cases may even lead to breakage of the discharge pipe.

As a countermeasure for the above, the conventional device is
As described in Publication No. 52107, in a vertical rising part where two discharge pipes are arranged in parallel,
Both discharge pipes are connected to each other by a resonance prevention member.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, two discharge pipes are connected to each other by a resonance prevention member to prevent resonance of both discharge pipes. is insufficient.

It is an object of the present invention to provide a vibration suppressing device that causes less wear on the discharge piping even if the discharge piping causes a resonance phenomenon due to pressure pulsations of the gas flowing inside the discharge piping. Another object of the present invention is to provide a suppression device.

[Means to solve the problem]

In order to achieve the above object, the present invention has a trapezoidal plate spring having a free height higher than the interval dimension of the opposing discharge piping, and has a plurality of central portions of trapezoidal leaf springs with open ends bent outwardly extended at both ends of the trapezoid. A first sliding plate having the same hardness as the leaf spring is interposed on one side of the pipe, and
While pressing the other opposing discharge pipe to lower the height of the trapezoid of the leaf spring, connect both open ends of the leaf spring to the discharge pipe with a second sliding plate having the same hardness as the leaf spring. A vibration suppressing device is formed in which the two are sandwiched together.

[Effect]

The pressure pulsation frequency of the gas flowing inside the discharge pipe matches the natural frequency of the discharge pipe, and even if a resonance phenomenon occurs, the vibration of the discharge pipe is suppressed by the trapezoidal leaf spring, reducing the amplitude and damping the vibration. do. Also,
Since the trapezoidal leaf spring presses against the discharge pipe, the leaf spring follows the vibration of the discharge pipe and does not separate from the pipe.

Further, due to the resonance phenomenon of the discharge piping, the central part and both open ends of the trapezoidal leaf spring slide on the sliding plate in the pipe axis direction, thereby buffering vibrations. The contact between the trapezoidal leaf spring and the sliding plate is almost a linear contact, and the pressure receiving part of this contact part has a relatively large area, so there is little wear. Furthermore, since the leaf spring and the sliding plate have the same hardness, there is no wear due to sliding. It will be the same. In addition, the sliding plate only slightly slides on the discharge pipe in the axial direction of the pipe, and the discharge pipe is hardly worn out.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

Fig. 1 shows a hermetic electric compressor, 1 is a hermetic container, and inside this hermetic container there is a compressor section 2 at the bottom,
An electric compressor with an electric motor 3 connected integrally thereto is housed in the upper part. 4 indicates the suction pipe. This hermetic electric compressor is a compressor for a refrigeration machine, and refrigerant gas returned from the evaporator (not shown) of the refrigeration system flows into the hermetic container 1 through the suction pipe 4, and then covers the electric motor. flows into the passage of the electric motor from the suction port 3a of
After the electric motor is cooled, it is sucked into the compressor section 2 by the reciprocating motion of the piston 5, is compressed, and is discharged into the head cover 6 through the cylinder head.Then, it passes through the discharge pipe 7, collects in the collecting pipe 8, and is further discharged. The liquid is taken out of the closed container via pipes 9 and 10, and guided to a condenser (not shown) of the refrigeration system. A vibration suppressing device is attached to the discharge pipes 9, 10 as shown in FIGS. 2 to 4. In FIG. 2, numerals 9 and 10 are the above-mentioned discharge pipes, and 11 is a vibration suppressing device connected between both the discharge pipes. This vibration suppression device is formed of a fixed leaf spring and a sliding plate, and the leaf spring has a trapezoidal shape in which the fixed free height h is higher than the spacing between the opposing discharge pipes 9 and 10, as shown in FIG. A trapezoidal plate spring 12 is formed by extending an open end 12c of an appropriate length bent outward at both ends thereof, and is inserted between the discharge pipes 9, 10 and the plate spring 12. It is composed of a rectangular first sliding plate 21 and a long and thin second sliding plate 22 having the same hardness.

The assembly of the members of the vibration suppressing device will be described below.

The trapezoidal upper surface of the trapezoidal leaf spring 12 is joined to one of the discharge pipes 10 by sandwiching the first sliding plate 21, and the upper surface of the trapezoidal leaf spring 12 is connected to one of the discharge pipes 10 so as to sandwich the discharge pipe 10 therebetween. Bend it more than 90 degrees and clamp it,
Further, the bent piece 21a of the sliding plate 21 is also bent so as not to separate from the sliding plate 12, and is locked to the sliding plate 12.

Next, while pressing the trapezoidal leaf spring in the direction of decreasing the height of the trapezoid by the other discharge pipe 9, a second slip is created between both open ends 12c of the leaf spring and the discharge pipe 9. Sandwich the plate 22 and slide the sliding plate 2 at the discharge pipe 9.
2 and the trapezoidal sliding plate 12, bend the clamping pieces 12a on both sides of the open end downward by more than 90 degrees, and then clamp the discharge pipe 9. The sliding plate 22 has an elongated rectangular shape extending to both open ends 12c of the leaf spring, and has a window 22b in the center into which the stopper 13 is inserted.
Since the stopper 13 fixed to the discharge pipe 9 is located in the inside of the discharge pipe 9, the stopper 13 does not come off even if the leaf spring is not engaged with a bent piece or the like, and the both open ends 12c of the leaf spring and the discharge pipe 9. The stopper 13 prevents the trapezoidal leaf spring 12 from moving in the axial direction of the discharge pipe. Even if it moves, the trapezoidal oblique piece comes into contact with the stopper 13 and prevents it from moving any further. ing.

A trapezoidal shape is preferable for the plate spring as a member that applies an initial load to the plate spring and elastically connects both discharge pipes.

In the vibration suppressing device having the above structure, the pressure pulsation frequency of the gas flowing in the discharge pipes 9 and 10 matches the natural frequency of the discharge pipes 9 and 10, and even if a resonance phenomenon occurs, the vibration suppression device 10 is leaf spring 1
Due to the damping effect in step 2, the vibration amplitude does not become large, and the vibration and noise of the hermetic electric compressor do not become large. Further, the discharge pipes 9 and 10 are not damaged due to vibration.

Further, in this embodiment, the plate spring 12 is attached with a pressing load (initial load) applied to it by the discharge pipes 9 and 10 in order to increase the damping effect. The leaf spring 12 deforms under the load so as to lower the height of the trapezoid (see Fig. 2).In other words, the upper surface of the trapezoid bends into a curved shape and contacts the sliding plate 21 at both shoulders. Further, the lower end of the trapezoid contacts the sliding plate 22, and the tip side of the open end 12c is slightly separated from the sliding plate.
Therefore, the contact areas between the leaf spring 12 and the sliding plate 22 are the four wide line contacts mentioned above, and the surface pressure at these areas is high. When sliding on the outer surface, even if sliding wear occurs, it will occur between the above four locations of the leaf spring and the sliding plate, and the leaf spring 12 and the sliding plates 21, 22
The sliding contact part is a nearly wide line contact, and the contact part has a relatively large area, the sliding surface pressure is relatively small, and there is little wear. In addition, the discharge pipes 9 and 10 are provided with sliding plates 21 and 22.
Since the contact area is large and the contact pressure is reduced, the discharge pipes 9 and 10 will slide on the sliding plates 21 and 22 even if they move when the leaf spring 12 is activated. The contact parts will not wear out.

In addition, since the trapezoidal leaf spring 12 is installed with an initial load applied as described above, it follows the vibration of the discharge pipe, that is, when the pipe vibrates in the direction of expansion, the leaf spring follows and increases the height of the trapezoid. The pipe does not stretch and separate from the pipe, and shock loads such as vibrations do not occur. Furthermore, since the discharge pipe is pressed by the initial load, the amplitude of vibration of the discharge pipe is further reduced.

Note that since the sliding plates 21 and 22 have a hardness comparable to that of the leaf spring 12, sliding wear occurs in the same way for both, so that a long life can be maintained. In this embodiment, a trapezoidal leaf spring has been described, but this leaf spring is not limited to a trapezoid, but also includes a curved trapezoidal leaf spring that approximates a trapezoid with curved corners. It is something.

〔Effect of the invention〕

As explained above, according to the present invention, the amplitude due to the resonance phenomenon of the discharge piping is reduced, the vibration and noise of the hermetic electric compressor are reduced, and the sliding of the leaf spring is received by the sliding plate. In addition, the pressure receiving area of the sliding portion between the leaf spring and the sliding plate is also relatively large, reducing wear, and the leaf spring and the sliding plate wear out in the same manner, thereby extending the life of the vibration suppressing device. In addition, the leaf spring follows the vibration of the discharge pipe, and no shock load due to vibration occurs between the discharge pipe, the sliding plate, and the leaf spring, and the wear of the discharge pipe, the sliding plate, and the leaf spring is small and no damage occurs.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a hermetic electric compressor, FIG. 2 is a vertical cross-sectional view of a vibration suppressing device portion showing an embodiment of the present invention in the front position, and FIG. 3 is a cross-sectional view of a trapezoidal leaf spring. 4 is a top view of the vibration suppressing device portion of FIG. 2, and FIG. 5 is a sectional view taken along the line V--line in FIG. 2. 2... Compressor, 9, 10... Discharge piping, 12... Leaf spring, 12c... Open end, 13... Stopper, 21...
First sliding plate, 22... Second sliding plate, 21a... Bent piece.

Claims (1)

[Claims] 1. A hermetically sealed device in which a compressor and an electric motor are integrally housed in a hermetically sealed container, and a plurality of discharge pipes connecting the compressor section and the hermetically sealed container are arranged in the space inside the hermetically sealed container. In a type electric compressor, the central part of a trapezoidal leaf spring, which has open ends bent outward at both ends of the trapezoid whose free height is higher than the interval dimension of the opposing discharge piping, is attached to one side of the discharge piping. A first sliding plate having a hardness similar to that of the above plate spring is interposed between the plate springs and the opposite discharge pipe is used to press the plate spring so as to lower its trapezoidal height. A hermetic electric compressor characterized in that a vibration suppressing device is provided on the discharge piping with a second sliding plate having the same hardness as that of the leaf spring interposed therebetween. 2. The hermetic electric compressor according to claim 1, wherein the edge of the sliding plate is engaged with a trapezoidal leaf spring.