DE1628266A1 - Rotating compressor - Google Patents

Description

General Electric Company, 1 River Road, Schenectady, N * Y., USA

Rotating Compressor

The present invention relates to rotary compressors and in particular on a hermetically sealed rotary compressor, which is particularly suitable for use in cooling systems and the like.

A known type of rotary compressor has a cylindrical Wall that forms the compressor cylinder, one inside of the cylinder eccentrically mounted rotor and a wing that is slidably mounted in the cylindrical wall and the cylinder by engagement of its inner end with the circumference of the rotor divided into a high pressure and a low pressure side. During operation of such a compressor «it is necessary to put the wing in permanent, well-sealing engagement with the rotor surface keep. One or more is usually used for this purpose Compression springs between the outer fit gel end and a suitable solid one Attack. Such springs have become with rotary compressors have proven to be quite good at low throughput, in which the maximum

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stood proportionately between the rotor and the cylinder walls is small and in which the wing covers a relatively short distance during the eccentric rotation of the rotor in order to with the Rotor to stay engaged. For rotary compressors for higher However, throughputs at which the maximum distance between the eccentric rotor and the cylinder wall is considerable, the Move the blades over a longer stroke during each revolution of the rotor. In order to have the necessary spring action under such conditions To get this, the wing springs have to be made stiffer and larger will. If no additional space can be provided for such springs, the permissible stress limits of the Springs are exceeded, with the result that the springs break.

According to the illustrated embodiment of the invention there is the rotary compressor consists of a cylinder forming the compressor Cylinder wall, an eccentric rotating inside the cylinder Runner and one mounted in the cylinder wall, between the ZyIindereinnahm- and -auslaßöffnungen sliding wing, the with the. Run he ί is engaged to put the cylinder in high and low To subdivide low pressure sides. To the wing in constant engagement to hold with the rotor surface, a plunger is provided, the one in the cylinder wall on the side facing away from the wing of the rotor is displaceable, as well as a spring clip or Federjoch, .das den; Piwnger ^ md? connects the wing in such a way that Plunger and vanes in all positions of the * rotor within the cylinder be pressed against the Botor by spring force. Since the plunger and

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the blades that are in contact with opposite sides of the rotor oscillate together or move back and forth, the only change in tension on the connecting spring clip is the one that differed from the minor one in the distance between the contact points of the wing and plunger during the rotation of the rotor results in * According to a preferred embodiment the invention also serves as a valve for the plunger the control of the periodic injection of liquid coolant into the high pressure side of the cylinder.

For a better understanding of the invention, refer to the enclosed Drawing referenced *

Figure 1 shows an elevation, partly in section, of a hermetic one Refrigerant compressor according to äer

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1.

Figure 3 is a schematic view of a cooling system. to the compressor according to the invention, f

In the figures 1 is a hemetic connection housing to which a circulation compressor 2 is attached
drive shaft 3 with an electric one

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The compressor has a cylindrical wall 6, the inner cylindrical surface 7 of which, in conjunction with an upper end plate 8 and a lower end plate 9, forms the annular compressor chamber. A rotor 11 driven by an eccentric % 2 on the axis 3 is arranged inside the cylinder chamber 10. A vane 14 slidably disposed in a radial slot 15 extending through cylinder wall 6 engages rotor 11 and divides cylinder 10 into a high pressure side and a low pressure side 17.

Hermetic compressors of the type mentioned are especially for suitable for installation in cooling systems, for example according to Figure 3, and are used to remove low-pressure or gaseous coolant from the Evaporator 18 to be pumped out through a suction line 19 and high pressure coolant to be fed through a discharge line 20 to a condenser 21 in which high-pressure coolant is condensed into liquid, before passing through a capillary tube 22 or equivalent, the flow restricting agent is supplied to the evaporator 18. Included the suction line 19 directs the low-pressure coolant of the low-pressure side 17 of the cylinder, through one on the low pressure side of the wing 14 lying suction opening 24 in the cylinder wall 6, during higher pressure coolant from the high pressure side 16 of the cylinder through an outlet port controlled by an outlet valve 26 25 is inserted into the interior of the housing 1 * After this high pressure coolant through the engine 2 and in heat exchange so that it has flowed, it is fed from the housing 1 in the middle of the outlet line 20 to the condenser 21.

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To prevent the rotation of the rotor II within of the cylinder 10 surface pressure coolant from the high pressure side in the low pressure side 17 leaks, it is necessary that the front Edge 29 of the wing 14 is permanent and independent of the position of the rotating bot within the cylinder 10 with a sealing the circumference of the rotor 11 is engaged. This requires that during each revolution of the rotor 11 the vanes between one in Figure 2 Illustrated forward position in which the wing is in the cylinder 10 protrudes, and a retracted position oscillates back and forth in which the leading edge 29 of the wing is essentially flush with the cylinder wall 7.

As already ah ^ was suggested hanging the springs for good contact between the blade and the Rotöroberfläche necessary requirements: a number of factors, among others * on the length of the stroke of the wing, in turn, on the size of the compressor depends, that is, on the difference in the diameters of the rotre and cylinder.

According to the present invention, a significantly improved arrangement is obtained for the pretensioning of the wing 14 for engagement with the lotor 1%, namely a spring is provided which can exert a relatively constant spring pressure on the wing without to be exposed to considerable stress. In particular, in the new arrangement to ensure good contact between the blade 14 and the rotor, a cylindrical plunger 30 is provided.

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see * the in a side of the facing away from the wing ld. Rotor through the cylinder wall 6 extending cylindrical Opening 31 is slidable, and the inner end 32 with the Rotor 11 can come into engagement, being a generally U-shaped shaped spring yoke or a spring clip 33 with its one end 34 removably engages the outer end 35 of the plunger 30, and the other end 36 similarly in the outer end 37 of the wing 17 is stored. In the embodiment shown, this bracket is made of spring wire, and an intermediate part of the bracket moves in part of a groove 39 on the outer surface the cylinder wall 6 and is thereby supported.

In this arrangement, the inner ends of the vane 14 and the plunger 30 are held in permanent engagement with the periphery of the rotor 11 by the spring clip 33. The bracket is designed so that it exerts just enough spring force to seal the wing 14 in. keep in touch with the runner. Since the plunger and the vane are on different sides of the rotor 11, the eccentric rotation of the rotor within the cylinder 10 causes the plunger and vane 14 to move simultaneously in the same direction, i.e. either to the right or to the left when viewing the figure of these two members connecting spring clip 33 oscillates with them such that the stresses exerted on the spring 33 are only those * ui "from the small change in dent contact distance of the plunger and of the wing to the rotor during the eccentric rotation d © s rotor: -ergaben, The length of this

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The distance is greatest when the rotor assumes the position shown in FIG. 2 and ata smallest when it is in a position rotated by 90 ° or stress of the Federbügeis 33. It is noted - _t that the plunger has a diameter which is much smaller than the height of the rotor _s so that it does not disturb the ^ umptätigkeit of the rotor.

Another advantage of this arrangement for biasing the wing. is that the entire preloading force of the spring S3 acts only on opposite sides of the rotor and is not transmitted to the bearing or bearings for the axle, as is the case with the usual springs _t which for example in the slot 15 between the rear end 37 of the wing and a suitable support surface near the rear end of the slot 15 are arranged *

In a preferred embodiment of the invention, the ger 30 also as a valve for controlling a momentary or periodic Introduction of condensed coolant into the high pressure side 16 of the cylinder 10.

As is apparent from the amerikanischenPätentsehrift3 1963 results in the injection of condensed refrigerant from the condenser directly to the push side of the cylinder to a bestimkteh points of the compression cycle a means, * m, the temperature of the discharged from the compressor into the housing

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To lower high pressure coolant and thereby an improved To achieve cooling of the rotor contained in the housing.

The liquid injection means controlled by the plunger Coolants contain a channel within the cylinder wall 6 for the coolant, a first part 40 extending upwards through the plate 9 and the wall 6 into the cylinder opening 31, while a second part 41, shown in Figure 2 in dashed lines is shown, has an opening into the high pressure side 16 opening. The first part 40 is through the line 45 via a Flow-limiting capillary 46 is connected to the condenser 21 at a point that controls the normal flow before the Facility 22 is located. A circumferential or annular groove in the plunger 30 forms the two passage parts 40 and 41 when the plunger 30 moves out of the cylinder 10 into the position shown in FIG retracted position is moved and thus serves as a valve, around dfe injection of liquid refrigerant from the condenser to allow in the cylinder. The liquid coolant is only then injected into the high pressure side 16 of the cylinder! if »iefe the plunger is in its retracted position shown in FIG and in accordance with the teaching of the aforementioned American patent the outlet opening 42 is so arranged in the cylinder wall 7, that the liquid coolant is injected at a time when the pressure within the high pressure side 16 is above the suction pressure and is sufficiently below the discharge pressure to

To enable injection.

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Claims (6)

"9" \ 1ÖZ8266 claims 1.) Rotating compressor with one cylinder, one eccentric in it rotating rotor and a vane arranged displaceably in the cylinder wall, which is connected to the rotor by spring force is held in engagement, d ä d u r c h ge k e η η ζ e i η e t that a plunger (30) slidable in the Cylinder wall (6) on the side facing away from the wing (14) of the rotor (11) is arranged, and that the plunger (30) and the Wings (14) are connected by a spring clip (33) through which the plunger (30) and the wing (14) in all positions of the rotor (11) be held in engagement with this. 2. Compressor according to claim 1, η η , - drawings η et that the plunger (30) and the wing (14) are displaceable radially to the axis of the cylinder (10). 3. Compressor according to claim 1 or 2, characterized ge ken η ζ eich η et that the plunger (30) and the wing (14) with the rotor (11) are in engagement at substantially diametrically opposite points of the rotor (11) . 4. Compressor according to one of claims 1 to 3, as through g e k e η η ζ e i c h net that the spring clip (33) is essentially Is U-shaped and the outer surface of the cylindrical Wall (6) has a groove (39) in which a between the ends engaged with the plunger (33) and the wing (14) (34,36) lying part of the bracket (33) is slidably mounted. 1- 326/0101; V- -: v ■ - ^X0 "'Ib. ^ 82-6 6 5. Compressor according to one of claims 1 to 4, characterized in that means (40-43, 45,46) for injecting condensed liquid coolant into. the high pressure side (16) of the cylinder (10) during compression of the coolant gas therein t an injection channel (41,42), which with the high pressure side (16) of the chamber (10) in connection and a valve device connected to the plunger (30) (43/40/41 /) to cause a small amount of liquid coolant to be injected into the cylinder (10) when the plunger (30) moves out of the cylinder (10). 6. Compressor claim 5, dadurchgeke η η-distinguished according to that the valve assembly includes a recess (groove 43} on the wall of the plunger (30) and the recess establishes a connection between the through Let ropes (40,41) _s if siäi the Plunger (30) out of the cylinder (10) has moved out. BATH ORIGINAL 1098 26/0 101