US3790308A

US3790308A - Spring suspension for mounting the motor compressor of a refrigerating machine in its case

Info

Publication number: US3790308A
Application number: US00288770A
Authority: US
Inventors: B Romer; H Pedersen
Original assignee: Danfoss AS
Current assignee: Danfoss AS
Priority date: 1971-09-14
Filing date: 1972-09-13
Publication date: 1974-02-05
Anticipated expiration: 1991-02-05
Also published as: DE2145883B2; GB1407047A; ES405809A1; FR2152870B1; JPS4837745A; FR2152870A1; DE2145883A1; DE2145883C3; SE373197B; DD97740A5; AU463326B2; AU4475272A; IT964868B; BR7206377D0; AR197476A1; CA971931A

Abstract

The invention relates to a spring suspension system for mounting a motor compressor unit of a refrigeration machine in its case. Flanged, rectangularly shaped brackets are fixedly attached to the inner casing wall. Cooperating brackets having an L-shape with one leg having the form of a frame are attached to the flanged brackets. Each bracket set has a nesting arrangement with the rectangularly shaped leg of the fixed bracket being nested in the frame part of the other bracket. The flange of one bracket has apertures for receiving a resilient stirrup which wedgingly maintains the other bracket in its installed position. The Lshaped brackets have bores which are respectively complementary to bores provided in the motor compressor unit. Coil spring are threadedly inserted in aligned pairs of bores to provide a resilient suspension system.

Description

United States Patent [191 Romer et al.

SPRING SUSPENSION FOR MOUNTING THE MOTOR COMPRESSOR OF A REFRIGERATING MACHINE IN ITS CASE Inventors: Bendt Wegge Romer, Sonderborg;

Hans Kristian Pedersen, Nordborg, both of Denmark Assignee: Danfoss A/S, Nordborg, Denmark Filed: Sept. 13, 1972 Appl. No.: 288,770

Foreign Application Priority Data Sept. 14, 1971 Germany 2145883 US. Cl. 417/363, 248/15 Int. Cl. F04b 17/02, Fl6p 15/06 Field of Search 248/14, 15, 223, 224, 225, 248/290, 294, 15 V, 15 D, 15 P; 417/360,

' 363, 360 A, 363 E, 363 T References Cited UNITED STATES PATENTS 5/1963 Hannibal 2/1968 Latter ..4l7/363 Feb. 5, 1974 3,445,059 5/1969 Hannibal et al. 417/363 1,929,171 10/1933 Jenkinson 3,531,222 9/1970 Randall et al Primary Examiner-William L. Freeh Assistant Examiner-G. P. LaPointe [57] ABSTRACT The invention relates to a spring suspension system for mounting a motor compressor unit of a refrigeration machine in its case. Flanged, rectangularly shaped brackets are fixedly attached to the inner casing wall. Cooperating brackets having an L-shape with one leg having the form of a frame are attached to the flanged brackets. Each bracket set has a nesting arrangement 7 with the rectangularly shaped leg of the fixed bracket being nested in the frame part of the other bracket. The flange of one bracket has apertures for receiving a resilient stirrup which wedgingly maintains the other bracket in its installed position. The L-shaped brackets have bores which are respectively complementary to bores provided in the motor compressor unit. Coil spring are threadedly inserted in aligned pairs of bores to provide a resilient suspension system.

2 Claims, 2 Drawing Figures SPRING SUSPENSION FOR MOUNTING THE MOTOR COMPRESSOR OF A REFRIGERATING MACHINE IN ITS CASE The invention relates to a spring suspension for mounting a motor compressor of a refrigerating machine in its case, and comprising a helical spring which is connected to the motor compressor and is held at its upper end in the first limb of an angled supporting element, which limb extends into the interior of the case, the second limb, which runs parallel with the wall of the case, being secured to a carrier firmly connected to the wall of the case.

In the normal spring suspensions, one of the limbs of the angled supporting element is welded directly to the wall of the case. The limbs, which are designed to hold the helical springs therefore project into the interior of the case when the motor compressor is to be introduced into the case for the purpose of assembly. Not only is the assembly operation impeded by this, but the case must often have a greater diameter than is necessary for operational purposes.

In a known spring suspension, a bowed element is therefore secured to the wall of the case, and this element forms with the wall of the casean opening into which one of the limbs of the angled supporting element can be inserted from above. Thus, the motor compressor need be only slightly smaller than the inside diameter of the case; the compressor can therefore be comfortably introduced into the case. The inserted limb of the angled supporting element, however, is only held in position by the weight of the motor compressor. If the compressor is transported in the upside down position, the limb can fall out of the opening into which it has been'inserted.

The object of the invention is to provide a spring suspension of the initially stated kind which does not impede the fitting of the motor compressor in the case and in which the angled supporting element is secured in the position in which it is fitted.

According to the invention, this object is achieved by providing the carrier with an integral strip which extends into the interior of the case and which has an upwardlyfacing bearing surface, at least one opening and a downwardly facing backing surface, by the second limb of the angled supporting element incorporating corresponding bearing and backing surfaces, said bearing surface being on a web at the upper end of this limb, and by the provision of at least one resilient rod which, through an opening in said integral strip, engages that side of the second limb remote from the wall of the case, lies against the lower end of the second limb, and presses this limb against the wall of the case.

With this arrangement, the motor compressor can be comfortably introduced into the case from above, since only the narrow strip integral with the carrier projects into the interior of the case. Thebearing surface of the angled supporting element is then pushed on to the strip and secured in this position by at least one resilient rod. The resilient r'od presses the second limb against the wall of the case, so that when the angled supporting element is loaded in a direction opposite to that of the load applied by gravity during normal operations, no undesirable shifting of the angled supporting element occurs, since this is prevented by the complementary backing surfaces on the carrier and the angled supporting element.

In particular, the second limb of the angled supporting element merges with the first limb at its lower end. This results in a spring suspension of greater stability.

Considerable advantage accrues if the lower end of the second limb has an inclined surface. This results in the resilient rod being tensioned in a simple manner, and ensures in all circumstances that the abutting faces cannot disengage from each other.

In a preferred construction, the strip integral with the carrier is disposed at the upper end of a fixing plate, and the second limb takes the form of a frame which embraces this plate. The underside of the upper web of the frame then forms the bearing surface cooperating with the integral strip, whereas the upper side of the lower web of the strip provides the backing surface that cooperates with the backing surface formed on the lower end of the fixing plate.

Assembly is facilitated if two resilient rods are connected at their upper'ends to form a resilient stirrup.

The upper ends of the resilient rods are expediently bent towards the wall of the case. When these upper ends bear against the wall of the case, additional spring tension is obtained.

A particularly advantageous arrangement is that wherein the bent upper ends of the resilient rods extend into the gap separating the cup shaped body and the cover plate of the case. After the two parts of the case have been welded up, the resilient rod is not only held in position by its clamping action, but it also prevented from slipping out by means that confine it axially.

The invention will now be described in greater detail by reference to an embodiment illustrated in the drawing, in which:

FIG. 1 is a diagrammatic longitudinal section through an encased motor compressor with the spring suspension in accordance with the invention, and

FIG. 2 is a perspective illustration of various parts of the spring suspension.

A motor compressor 1 is mounted in a case 2. The case consists of acup shaped lower part '3 and a cover plate 4 which are interconnected along a plane of division 5. The motor compressor 1 has a carrier element 6 on which a stator 7 is mounted; a cylinder 8 and a bearing 9 are formed integrally with this carrier element. The element also supports the shaft 10 which carriers a rotor 11 and drives a piston through a crankpin 12. Also, a cylinder head 14 and a noise reducing element 15 are secured to the cylinder.

This motor compressor 1 is connected to the case 2 by means of a spring suspension 16.

The spring suspension 16 comprises a carrier 17, an angled supporting element 18, a resilient stirrup l9 and v a helical spring 20. One end of the helical spring is secured in a holder 21 in the carrier element 6, and its other end is a holder 22 in the first limb 23 of the angled supporting element 18. The second limb 24 is in the form of a frame. Thus it consists of an upper web 25, two side webs-26 and 27 and a lower web 28. The downwardly facing surface 29 of theupper web 25 is a bearing surface, and the upwardly facing surface 30 of the lower web 28 is a backing surface 30. The carrier 17 consists of a fixing plate 31, which is welded to the wall of the case 2, and of an integral strip 32 extending into the interior of the case. The upwardly facing surface of the strip 32 constitutes a bearing surface 33, and the downwardly facing surface of the fixing plate 31 constitutes a backing surface 34. The open crosssection of the frame 24 is of such dimensions that it can be pushed over the carrier 17, the surface 29 bearing on the surface 33, and the surface 30 lying opposite to and at a slight distance from the surface 34. Two openings 35 are provided in the strip. Two parallel resilient rods 36, connected to form a stirrup 19, extend through these openings. The upper end of the resilient strip 19 is bent towards the wall of the case. That surface of the lower web 28 facing inwardly of the case slopes inwards and downwards.

During assembly, the fixing plate 31 of the carrier 17 is first firmly welded to the wall of the case 2. After the motor compressor 1 has been introduced into the case, the frame-like second limb 24 of the angled supporting element 18 is pushed over the carrier 17, so that the surface 29 lies opposite the surface 32, and the surface 30 opposite the surface 34. The rods 36 of the resilient stirrup 19 are now pushed downwards through the holes 35 in the strip 32, the lower ends of the rods moving over the inclined surface of the web 28, and finally occupying the tensioned position illustrated in FIG. 1. The bent upper portion of the stirrup 19 is then located at the level of the gap 5. After the cover plate 4 has been welded on to the cup shaped body 3, the resilient stirrup 19 cannot be displaced. It will be seen that the angled supporting element 18 retains its position not only when subjected to normal loading, as shown in FIG. 1 but also when under any other kind of load.

We claim:

1. A motor compressor assembly comprising a casing, a motor compressor unit disposed in said casing, a two part holder having a bracket part attached to the inside wall of said casing and an L-shaped part attachable to said bracket part, said bracket part having av rectangular shape and a flange extending from the upper edge thereof, said L-shaped part having two legs with one leg having a bore and the other leg having the fonn of a rectangular frame in which said bracket part nests, said bracket part flange having aperture means part in a fixed position.

I 1F t

Claims

1. A motor compressor assembly comprising a casing, a motor compressor unit disposed in said casing, a two part holder having a bracket part attached to the inside wall of said casing and an L-shaped part attachable to said bracket part, said bracket part having a rectangular shape and a flange extending from the upper edge thereof, said L-shaped part having two legs with one leg having a bore and the other leg having the form of a rectangular frame in which said bracket part nests, said bracket part flange having aperture means spaced from said inside casing wall, key means insertable into said aperture means to hold said L-shaped part in a fixed position, a bore in said unit aligned with said bore in said L-shaped part, each of said bores having thred means, and a coil spring threadedly mounted in said bores to provide a resilient suspension member.

2. A motor compressor assembly according to claim 1 wherein said rectangular frame leg has a lower inclined surface, said key means being wedgedly engagable with said inclined surface to maintain said L-shaped part in a fixed position.