DE1503407A1 - Spring suspension for an encapsulated motor compressor - Google Patents

Description

Spring suspension for an enclosed motor compressor

The invention relates to a spring suspension for a encapsulated motor compressor with vertical shaft, especially for a small refrigeration machine, using a spiral shape a band of constant cross-section of coiled springs, the inner winding of which on a fastening pin in axial and radial direction Direction is held.

A spring suspension is known in which the motor compressor is held by three such ribbon springs with a vertical winding axis at the lower end. The inner turn engages in each case a mounting pin attached to the motor compressor. The attachment to the outside is done by a tangential Extension of the outer turn, which is fixed in a holder on the capsule.

Other motor compressors are suspended in the capsule with the help of tension springs. Except constructions with several parallel ones There are tension springs in which pairs of tension springs at an angle to one another are provided.

There have also been used compression springs wound in a conical shape from wire with a horizontal winding axis, which in a motor compressor with a vertical shaft at a distance of about 120 ° clamped between the capsule and the motor compressor.

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_ 2 -

With _x spring suspensions for encapsulated motor compressors, two contradicting conditions have to be met. On the one hand, the suspension should be as soft as possible in order to be able to produce good sound absorption. On the other hand, the suspension should be as hard as possible so that the motor compressor is not deflected so much that it hits the capsule wall in the event of shock loads, such as can occur at the moment of start-up and during transport. If the springs are too soft, they can also be excited at a resonance frequency, for example during transport on a motorway, in which the joints between the cement slabs cause an oscillation frequency of 67 Hz. Therefore, in the known spring suspensions mentioned, it was necessary to make a compromise between these conditions, which resulted in a reduction in the distance between the capsule and the motor compressor.

It is also a spring arrangement is known which has a conically wound ribbon spring with a vertical axis, the Inner turn is held on a pin and the outer turn is firmly enclosed by a boundary wall and rests against a stop surface. This spring arrangement has a progressive spring characteristic, i. H. such Dependence between load and spring deflection that a certain change in load with lower load a causes greater change in suspension travel than with greater load. This characteristic results from the fact that as the axial load increases, the other turns increasingly apply to the stop surface and are therefore ineffective will.

Furthermore, a spring arrangement is known in which a helically wound ribbon spring, held on the inside on a pin and enclosed on the outside by a boundary wall, is a horizontal one Owns axis. This spring can be used both axially so that cushioning is possible in any direction and move freely in the radial direction.

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There is also a spring arrangement made of elastic material with an inner and an outer sleeve known in which the Inner sleeve in the unloaded state is so eccentric to the outer sleeve that it is only under a medium load sets the centric position.

In the case of an encapsulated motor compressor with in the longitudinal axis arranged cylinder springs, which are held between two end faces, one has already from one face let an elevation protrude into the interior of the spring, which interact as a transport stop with the other surface can. ™

The invention is based on the object of a normal operation to create a relatively soft spring suspension for an encapsulated motor compressor that can withstand shock loads tends to rash to a much lesser extent in any direction, comes to rest in a shorter time and less responsive to resonance vibrations.

To solve this problem, a spring suspension of the type described at the outset is characterized according to the invention by the Combination of the following features for each ribbon spring:

a) The ribbon spring axis is horizontal,

b) the outer turn is firmly enclosed by a boundary wall and rests against a stop surface,

c) the winding axis is shifted so far eccentrically in the unloaded state that it is by the weight of the Motor compressor is brought into an approximately central position,

d) the dimensioning is such that the remaining windings are at a distance under normal load of the motor compressor from each other, but with increasing displacement of the motor compressor in the circumferential direction or in the vertical direction increasingly close to each other and with increasing displacement of the motor compressor in the radial direction

909884 / 137C

1103401

- Place 4 on the stop surface.

In this design, the spring "iüfhÖtigun # lit Ärfci" OB each other perpendicular directions has a spring characteristic, namely - with respect to $ h et tight - in the peripheral Eric Tung, in Vertikälriehtürtg tüid iti radial direction. Because in all cases are 2 ¹ OiIe of? "Eder by supporting each other, that is, ah the Begr # rizüiigsw ^ atid or on the stop surface unwirksamj Wedüreh increases the effective spring constant. Consequently, the Fed at low load" soft "and has good SehülidÄai ^ guiding properties; with heavier loads it is "hard" ¹ and brakes the movement of the motor compressor strongly deijfch spring properties can also be superimposed. Resöhänij8eH # iiigttngen cannot occur because the Resoha: riatre ^ Uetif5 shifts over the spring travel. In all of this, it is essential that the band spring undergoes almost the same change in spring characteristics in every radial load direction under normal load.

In a preferred embodiment, one is tapered Coiled ribbon spring and a vertical, flat contact surface on the side opposite the tip of the cone used.

The spring suspension can also be used as a transport strike serve, which takes effect before parts of the Äoterver compactor hit the capsule wall. When the fastening pin is located axially within the boundary Waid, leads an extreme movement of the motor compressor in the Uiüfangsrichtung or in the vertical direction so that the pin is below Interposition of all spring coils is supported on the boundary wall. Furthermore, the fastening pin can be a have such a length or such a flange that it can pass through If you hit the stop surface or the open face of the boundary wall, the end position of the spring system will

909884/1370

it's correct. This causes extreme movement of the motor compressor prevented in its radial direction.

The invention is explained in more detail below with reference to several exemplary embodiments shown in the drawing. Show it:

1 shows a schematic plan view of an encapsulated small refrigeration machine with a vertical motor shaft and

2 shows a view of a band spring used here with an outer fastening wall in the unloaded state.

A motor compressor 2, the motor shaft axis A of which is perpendicular, is housed in a capsule 1. From the only hinted at Outline of the laterally protruding cylinder 3 can be seen. The motor compressor 2 is in the capsule 1 on four Suspended spring assemblies 4-7, each of which has the same structure. They have a conically wound ribbon spring 8 A hollow pin 9, which sits on a carrier 10 attached to the capsule 1, engages in its inner turn. The outer Winding rests in a shell 11 attached to the motor compressor 2, the edge of which is a tightly surrounding the outer winding Boundary wall 12 and its bottom surface a stop surface 13 for the turns of the ribbon spring 8 and in the extreme case for the hollow pin 9 offers.

As FIG. 2 shows, the band spring 8 is shaped in the unloaded state in such a way that the center point M- of the inner _{turn lies eccentrically with respect to the center point M 2 of} the outer turn. During installation, care should be taken to ensure that the eccentric center M ₁ is at the top, so that when the motor compressor 2 is loaded, M and M «coincide.

The particular advantage of the spring suspension described here is that it is both in the axial direction and in radial direction has a progressive spring characteristic. In the event of a load in the axial direction,

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Increasing load one turn after the other from the outside on the stop surface 13, so that the spring becomes more and more rigid. In the radial direction, as the load increases, one turn after the other from the outside to the inside is applied to the part of the boundary wall 12 lying in the load direction, so that the spring constant also increases in this case. The dead weight of the motor compressor is already taken into account here due to the eccentric position of the center M ₁ in the unloaded state.

The spring arrangement also serves as a transport stop. * If there is an excessive load in the axial direction, lie down all turns or the end face of the hollow pin 9 on the stop surface 13 and prevent another Motor compressor movement. In the event of a radial load, all of the turns are pushed through the hollow pin 9 to the boundary wall 12 pressed, for which purpose this hollow pin 9 lies axially within the boundary wall 12, so that also in this Direction of further movement of the motor compressor is prevented.

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Claims (4)

- 7 claims 1. Spring suspension for an enclosed motor compressor with vertical shaft, especially for a small refrigeration machine, using a spiral of a band constant Cross-section of coiled springs, the inner twisting of which on a mounting pin in the axial and radial direction is characterized by the combination of the following features for each ribbon spring: a) The ribbon spring axis is horizontal, b) the outer turn is from a boundary wall (12) firmly enclosed and rests against a stop surface (13), c) the winding axis is shifted so far eccentrically in the unloaded state, (M-) that it is due to the weight of the motor compressor (3) is brought into an approximately central position (Mp), d) the dimensioning is such that the remaining turns under normal load of the motor compressor have a distance from each other, but with increasing displacement of the motor compressor in the circumferential direction or in the vertical direction increasingly close to each other and with increasing displacement of the motor compressor in the radial direction increasingly apply to the stop surface. 2. Spring suspension according to claim 1, characterized by a conically wound ribbon spring (8) and a vertical, flat stop surface (13) on the side opposite the tip of the cone. 3. Spring suspension according to claim 1 or 2, characterized in that that the fastening pin (9) is located axially within the boundary wall (12). 4. Spring suspension according to one of claims 1-3 »characterized in that the fastening pin (9) has such a 909884/1370 Length or has such a flange that it can be reached by striking the stop surface (13) or the open Front side of the boundary wall (12) the end position of the Fedefsystem certainly. 909884/13