US1768610A - Pump for refrigerating apparatus - Google Patents

Description

y 1930. J. G. KING ET AL 1,768,610

PUMP FOR REFRIGERATING APPARATUS I l Original Filed May '7, 1925 2 Sheets-Sheet l 97/15. 1 I gwvenlow J. G. KING ET AL 1,768,610

NC: APPARATUS July 1; 1930.

MP FOR REFRIGERATI inai Filed May '7, 1

923 2 Sheets-Sheet 2 Ori M U \m Patented July 1, 1935 emw snares earsnr caries JESSE eQ mite AND HARRY .B. Hornet" DAYTON", OHIO, ASSIGNQES, BY Jnnsnn ASSIGNMENTS, TO GENERAL MOTORS MICHIGAN, A CORPORATION OF DELAWARE EESEARCE CORPORATION, I O]? DETROIT,

PUMP FOR'REFRIGERATING APPARATUS Original application filed May 7, 1923,

' 1924. Serial The present invention is not limited to but is particularly applicable to that type of compressor in which the medium to be compressed, does not enter the crank case of the compressor, in which type of compressor the crank case is sealed from the chambers which receive the medium by a metal bellows. One of the objects of the present invention is to lubricate the mech-' anism within said chambers.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clea ly shown.

In the drawings:

Fig. 1 is a sectional view of the improved compressor taken on lines 1-1 and 1-1' structure including a compressor EPOItlOIl.

21, a fan portion 22, and a motor 23 for driving said elements. The inlet to the compressor 21 is connected by a valve block 72 with pipe 24, which in turn is connected to an expansion chamber 30. The outlets of the compressor are connected by apipe 65 with a refrigerant condenser 81 which in turn is connected with the expansion chain ber 30 by a pipe 25. The compressed refrigerant within the condenser 81 iscooled by air expelled from the fan-portion 22.

The unitary structure comprising the refrigerating mechanism which is connected with an expansion chamber 30 includes a' main frame 40. The frame 40'includes end walls 40 and 40 and a top wall 40 enclos-' ing a gear housing 41. Top wall 40 is apertured to permitparts of the operating mech- Serial No. 637,186. lliivitled. and-this applicatien filed August 25,

anism to extend into the housing. The frame 40 supports a cylinder block 42 including horizontally disposed cylinders 43 and 44 provided with radiating. fins 45 and 46. Pistons 47 and 48 reciprocate respectively in the cylinders 43 and 44. Each piston is provided with a valve seat 49 adapted to be engaged by valve 50 provided at each end of a connecting rod 51. Each piston is provided with inwardly extending annular flanges 52 and 53 for guiding a connecting rod 51. Between the flange 52 and the seat 49 there is provided an annular groove 54. Communication between the groove 54 and arefrigerant chamber 55 provided within the'cy'linder block 42 is provided by the transverse passages 56 and 57 and the longitudinally extending bore 58 provided at each end of the connectin rod 51. As shown in Fig. 2 the piston 4% is pushed to the left by the enga ement of valve 50 with its seat 49 when t e .rod 51 moves to the left. When the rod 51 moves to the right it first engages a disc 60 surrounding the rod 51 and secured in position by means of screws 61. The heads of screws 61 arespaced from the inner end of the Zpiston 47 so as to allow the disc 60 to be separated from the piston by a slight amount. When the connecting rod 51 moves to'the rightin Fig. 2 it will first move without moving the piston 47 until it has engaged the Washer or disc 60, and disc 60 has engaged the heads of screws 61. At this instant the valve 50 will be moved away fromcause it to be forced out against the action of as ring-pressed valve 62 and then out throng an outlet opening 63. A counterpart of this opening is shown at 63*, at the head end of cylinder 44. These outlets are connected with the common pipe 65 which leads to the condenser 81.

The inlet for refrigerating gas into the compressor is provided'at the top of the s v c linder block 42 instead of through a side t ereof as has been the custom. The top wall of block 42 is provided with an. opening 70 in communication with a passage 71 in a valve block 72 of a shut off valve attached by screws 73 to the cylinder block 42. The valve block 72 carries a coupling 98, the inner end of which provides the valve seat 74 cooperating with a manuallvoperable' 76 for repump unit includes the field frame 110 at-- tachedby screws 111- to the frame 40 and sup orting pole icces 112 and field magnet win ings 1,13. he shaft 104 supports an armature 114 which overhangs the right of the end wall of frame 40 as viewed in Fig 2. 7

he shaft 104 is provided with two bearings 105 and 106 and the left-hand overhan in end of the shaft supports the fan whi e t e right-hand overhanging-end supports the armature. The shaft 104 is provided intermediate its bearings 105 and 106 with gear teeth 120 meshing with a gear 121 attached to a crank shaft including a crank pin 130 on which a nut 131 is threaded for retaining aball bearing 132 in position, the outer race 133 of which is engaged by the forked end 134 of a-rocking lever 135 which is mounted on a pin 136 supported on lugs 137 and 138 extending upwardly from a fulcrum plate 139 and spaced apartto-re ceive the lever 135. The fulcrum plate 139 is secured to the cylinder block 42 byscrews 140.

In order to seal the cylinder block 42 where the rocker lever 135 extends into it there is provided a flexible diaphragm or bellows 141 having its upper end permanent-' ly attached to washer 142 clamped against a shoulder 143 of lever 135 by a nut 144,

there being a packing ,ring 145 between the washer 142 and the shoulder 143. The lower end of the bellows 141 is permanently secured to an apertured disc 146 attached by screws 147 to the cylinder block 42, there being .a packing ring 148-between the disc 146 and the bottom of the block 42. The fulcrum in 136 and the bellows 141 are so related t at the lever 135 rocks about an axis midway between the ends of the bellows. In this way the bellows is not subjected to excessive side strain.

The upper end of the rocking bar 135 is provided with a cylindrical portion 150 which receives a block 151 having arcuate ends 152 adapted to be received by a notch 153 provided in the connecting rod 51, the

inssgeio ends of the notch: 153 being curved to receive the arcuate surfaces of the block 151.

Through the train of gearing and rocking leverdescribed the pump rod 51 will be reciprocatedand the blower 100 will be revolved when the motor isoperated. A. 'quan tity of lubricant is placed within the gear housing or crank case 41 for lubricating the mechanism therein. I g

A. certain amount of lubricant is placed in the refrigerant system for lubricating the cylinder walls and piston. The inlet of refrigerant to the coinpressor is located above rocking bar 135 and the oil in the refrigerant can drop directly upon the block 151 and notch 153 for lubricating the contacting surfaces thereof.

While the form of mechanism herein shown and described constitutes a preferred embodiment of one form of invention, it is to be understood that other forms might be adopted and various changes and alterations made in the shape, size and proportion of the elements therein without departing y from the spirit and scope of the invention.

What is claimed is as follows:

Apparatus of the character described comprising, in combination, a displacement chamber having an outlet for as and liquid lubricant, a circuit having its inlet connected with the displacement chamber and adapted to receive both gas and liquid lub- I ricant from the displacement chamber, displacement means cooperating with the displacement chamber, a receiving chamber communicating with the displacement cham: ber, mechanism within the receiving chamber for operating the displacement means, the outlet of said circuit being connected with the receiving chamber and said circuit being adapted to return the gas and the liquid lubricant to'the receiving chamber, said outlet being in a position to feed the liquid lubricant by gravity to said mechanism.

In testimony whereof we hereto-affix our signatures.

JESSE G. KING. HARRY B. HULL.

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