US1753944A - Air-cooled refrigeration apparatus - Google Patents

Description

April 1930. J. R. REPLOGLE AIR COOLED REFRIGERATION APPARATUS 1926 4 Sheets-Sheet Filed Oct. 26

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O am 1 ATTQA /VEM April 8, 1930. J. R. REPLOGLE 1,753,944

AIR COOLED REFRIGERATION APPARATUS Filed 001: 26, 1926 4 Sheets-Sheet 5 24 ATTOP/VfV.

April 8, 1930. J. R. REPLOGLE 1,753,944

AIR COOLED REFRIGERATION APPARATUS Filed Oct. 26, 1926 4 Sheets-Sheet 4 EiQZEMQiLL? Patented Apr. & TQFO s rai JOHN R. REPLOGLE, OF DETROIT, MICHIGAN, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

KIIELVINATOR CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF. MICHI- AIR-COOLED REFRIGERATION APPARATUS Application filed October 26, 1926*. Serial No. 144,249.

This invention relates to mechanical refrigeration apparatus of the type employing a motor-driven compressor and an air-cooled condenser. I F The invention has for one of its objects, the

provision of an air-cooled compressor-condenser unit, the several parts of which are so arranged that a highly compact and efficient device is produced.

Another object of the invention is the production of a highly efficient unit of the motor-driven compressor, air-cooled condenser type by employing an improved arrangement of the several parts of this unit with respect to an enclosing casing.

Another object of the invention is to provide a refrigeration unit of the character referred to having an improved arrangement of the parts which form the air-cooled condenser with respect to each other and also with respect to the remaining parts of the unit.

Another object of the invention is to provide for the efficient cooling of the cylinder Walls and exhaust valve of the compressor.

Another object of the invention is to provide a motor driven compressor-condenser unit of the air-cooled type in which the compressor is so mounted and so connected with the condenser as to minimize noise due to vibration ofthe parts.

Another object of this invention is the provision of a compressor-condenser mechanism having a maximum number of parts equally applicable to water and air-cooling.

Another object is the provision of a compressor condenser refrigeration unit of the air-cooled type having suitable manually operated cut-off valves in the several conduits which transfer the refrigerant from one element of the unit to another so that the different elements can be disconnected one from the other without any considerable loss of the refrigerant from the system.

Further objects more or less incidental or ancillary to the foregoing will appear in the following description in connection with the accompan in drawings which show a preferred em odiment of the invention.

In the drawings,

Fig. 1 shows a front elevation of the apparatus with certain parts broken away so as to disclose the interior of the compartment casing.

Fig. 2 is a side elevation of the apparatus with parts broken away.

Fig 3 is a partial section online 33 of Fig. 2 showing in particular the motor drive and compressor unit. I

Fig: 1 is a diagrammatic View of the compressor unit and vaporizer and connections therebetween.

Fig. 5 is a vertical cross section of end connections of the vaporizer.

Fig. 6 is an enlarged cross section on line 6-6, Fig. 1.

Fi 7 isan enlarged cross section on-the line,?'?, Fig. 2.

Fig. 8 is an enlarged sectional detail view of an end of the vaporizer used in this apparatus.

The means for housing the motor-compressor-condenser unit is clearly shown in Figs. 1 and 2. This means is in the form of a rectangular shaped casing designated as an entirety by the numeral 1 and having its lower end adapted to rest on some suitable support such as the floor of the building. The bottom, top, back, front and end walls of the casing are in the'form of sheet metal panels; 1, 1*, 1, 1 and 1 respectively which are carried by an interior frame structure formed of angle iron bars connected together in such a manner as to form a rigid skeleton structure. This frame structure comprises a horizontally disposed rectangular shaped set of angle bars 4 at the bottom of the casing, on the horizontal flanges of which bars 4, rests the floor board 2 of the casing. A second hori zontal set of angle barsfi, which are identical in construction with the set 4:, forms the supporting frame work for a top board 17 of the casing structure. A third horizontal set of angle bars5 is arranged between the first two sets mentioned and forms strengthening means for the mid portions of the structure. The reference character 7;? indicates four vertically arranged angle bars, each one of which is connected at its lower end to one of till the four corners of the lower set of angle bars 1, and is connected at its other end to one of the four corners of the middle set 5. The connection at the lower end of angle bars 7 is effected by means of gussets 9, and the upper connect-ion referred to is effected by means of gussets 10. The top set of angle bars 6 is secured to the intermediate set 5 by means of vertically arranged angle bars 8, 8. Each bar 8 is connected at its lower end to a corner of the intermediate set 5 by means of angle plates 11, and is connected at its upper end to a corner of the top set of angle bars 6 by means of gussets 12. These above mentioned connections are made by some suitable means such as bolts, rivets, or the like. The three sets of horizontally arranged angle bars which are connected together at their corners by means of the vertically arranged angle bars, described above, together form the interior skeleton frame work to which the end, front, baclt and top panels of the casing are secured by screws or the like. The finishing strips 14: are secured at the outer vertical corners of the casing after the panels have been fixed to the skeleton. frame structure. The top panel 1 has its turned down edges secured by screws to the top set of frame bars 6 and is backed by the top board 17 which rests on spacing blocks 18. These blocks 18 rest on and are secured to the horizontal flanges of the upper set of angle bars 6.

The casing is divided into upper and lower compartments 19 and 20, respectively, by means of a horizontal partition 21. This partition has its outside edges bent upwardly to form attaching flanges. hese flanges are secured to the vertical. sides of gussets 10, 10 at the four corners of the casing by means of screws 22 (see Fig. 2) The partition 21 has an aperture 23 therein for a purpose to be hereinafter described. The front panel of the casing has louvers 24 opening into the compartment 20. The back and end panels of the casing have louvers 25 connecting the interior of the upper compartment with the atmosphere. The louvers in the upper and lower compartments and the aperture 28 in the dividing partition are provided so as to provide for t e circulation of air in ainanner to be hereinafter described.

Tn the lower compartment of the casing is disposed the motor driven compressor, the air cooling fan, and a. dome-like casing surrounding the upper part of the compressor cylinder and constituting, in efiect, a part of the condenser, while in the upper compart ment 1%? is disposed a series of coils forming the slain part of the condenser.

The compressor is indicated in its entirety by reference character 50 and has a cylinder 51 projecting into the open upper end of its crank case 52 and is secured thereto by means of bolts lts piston 54 is adapted to reciprocatc in the cylinder and is attached to a crank 55 by means'of a connecting rod 56. The upper end of the compressor cylinder is closed by means of cylinder head 57 which has a central opening 58 therethrough. Spring pressed valve 59 is adapted to periodically open and close this opening in the cylinder head so as to allow the compressed refrigerant to escape from the compressor. The crank 55 is driven by means of a hori zontal shaft 60 which is connected to the lower end of the motor shaft 61 by means of suitable Worm gearing. The crank is connected to this horizontal shaft 60 by means of an integral sleeve 62 fitting over the end of the shaft, thereby forming a bearing for one end of the shaft. The opposite end of this shaft is journaled in a bearing 63 located in a cover Get for the gear casing 65.

The motor 66, which drives the compressor by means of suitable worm gearing and the connections just described, is of the universal type. It has a vertical shaft 61 to which is secured the armature 67. This armature is surrounded by a stator or field structure 68 which is cylindrical exteriorly and has its lower end resting on the outside edge of the horizontal flange 70 of the gear casing 65.

The construction of the motor, the compressor, and their driving connections is the same as is set forth in my copending application, Serial No. 475,344 filed June 6, 1921, to which reference can be made for some of the structural details.

As can be seen from an examination of Fig. 8, the fan 74- is secured to the movable parts of the motor by means of a bolt 72, and spacing sleeve 73. This bolt has a flanged head which rests on the upper surface of the fan. The shank part thereof extends through the spacing sleeve 73 and is screwed into the uper end of the vertical shaft 61. This spacing sleeve 73 rests on the upper end of the armature core and is rigidly secured thereto by means of the bolt 72 clamping the sleeve between the under surface of fan 74 and the upper end of the armature core. Upright cylindrical casing 75 for the fan 74 rests on the stator 68 at the outer edge thereof. This casing surrounds the fan 74 and has openings 7 6 at its lower end, through which air is supplied to the fan. The upper end of the casing is arranged directly under the opening 23 in the partition 21.

Telescoping over the upper end. of the compressor cylinder 51 is a dome-shaped casing 80. The upper end of the dome has provided therein. an opening 88, and at the lower end of the dome 80 are openings 89 and 90. The opening 88 is connected to a conduit 105 by means of a connection 112. This conduit leads to the inlet end of an air-cooled condenser to be presently described, and the opening 90 is connected by means of a connection 114 to a second conduit 10'? which leads to the outlet end of this air-coolcd condenser.

The opening 89 is closed by means of a plug 89 (Fig. 2). An opening 91 is provided in the vertical flange 77 of the compressor, crank case 52 (Fig. 1). 'This opening communicates at its innerend with the dome and at its outer end with a connection 92 which is connected by means of a conduit 118 with the inlet end of a vaporizer.

It will thus be seen that T have provided in the lower compartment 20 a highly compact motor-compressor unit. The lower end of the dome 80 serves as a sump for liquid refrigerant which is returned from the condenser to the dome through the connection 114. At the inner side of this opening is a goose-neck tube 94 connected to the dome at this opening by means of some suitable connection such as 95. The upper end of this goose-neck tube is arranged directly over the discharge valve 59 so that the liquid refrigerant coming from the condenser will pour over the discharge valve and down the sides of the compressor cylinders 51 and thereby cool the parts. This liquid pouring on the discharge valve also has a damping action thereon. At the exhaust end 'of the tube 94 is arranged a screen 96 to catch any particles of foreign matter which may have accumulated in the system so as not to interfere with the operation of the discharge valve 59. An opening 97 is provided in the tube right above the screen 96 so that should the screen 96 become entirely clogged with foreign matter, liquid refrigerant can still find its way out through this opening 97.

The motor, fan, gear case, compressor and the dome are all rigidly connected together and they are the parts of the unit which are subject to vibration due to their operation. These parts are attached to-the floor board 2 of the lower compartment 20 of the enclosing casing by means of a spring mounting. The purpose of this spring mounting is to permit this necessary vibration in the moving parts and at the same time to prevent its being transferred to the enclosing casing. The spring mounting alone is not a part of the present invention, it having been described and claimed in my copending application Serial No. 733,913, filed August 25. 1924, to which reference may be had for the structural. details. However, this spring mounting in combination with a peculiar refrigerant pipe connection to be hereinafterv described does form an important part of this invention.

The gear case has formed thereon a pro jection 250 which rests on a bar 26. This bar has apertures therein for the passage of stud bolts 27 which latter are rigidly connected to the floor board of the casing. Arranged on these stud bolts are collars 28 which are held against outward movement by means of nuts 29. Arranged between the collars 28 and the bar 26 are springs 30. The bar 26 fits loosely on the stud bolts so that reciprocation is permitted i. e.,- as much as the springs 30 will permit. It ,will be seen from an examination of Fig. 1 that I have provided a second bar 31 which is clamped at each end to the floor board. The gear casing and the crank case of the compressor have parts (notshown) from which parts stud bolts 31* extend. These stud bolts extend through the bar 31 and have springs 33 attached to each side thereof in a manner similar to that described in connection with springs 30 and stud bolts 27, the only difference being that the upper spring 33 carries the weight of the motorcompressor unit instead of the lower spring 30, as was described above in connection with bar 26 and stud bolt 27.

It will be noted from the examination of Fig. 2that the conduit 105 is bent in the form of a loop or helix 111 just before it enters the connection 112. This connection 112 is attached to the dome 80 at the opening 88 as was described above. It will also be noted that conduit 107 is likewise bent in the form of a loop or helix 113 before it enters the dome 80 at the opening 90 through connections 114. These loops 111 and 113 provide flexible connections between the dome and the condenser. Their purpose is to permit the vibration of the dome and motor compressor parts due to their spring mounting without injury to the conduits 105 and 107 and their connections 112 and 114.

In the upper compartment 19 of the casing, I have constructed an improved air-cooled condenser. This condenser consists in an up per header tube and a lower header tube 101. These headers are supported in position at each end by means of'connections 102. These connections 102 are rigidly attached to the horizontal flange of the sets of angle bars 5 and'6 by means of bolts 103. This connection means and arrangement of the header can clearly be seen from an examination of Fig. 1.

It will be noted that the upper header 100 is inclined downwardly toward the right of Fig. 1, and the header 101 is inclined downwardly toward the left of Fig. 1. These headers are so inclined. in order that the refrigerant will quickly pass through the condenser by means of gravity. as soon as it is in a liquid form. This will prevent the liquid refrigerant. and also any globules of oil which might be in the condenser from clogging up the passages and thereby hindering thefreecirculation of the gaseous refrigerant.

The upper end of the upper header 100 has an inlet pipe connection 104 in which the metallic conduit 105 is inserted. This conduit 105 leads to the opening 88 in the dome-shaped casing 80 as will be seen from an examination of Fig. 3. The lower end of the lower header 101 also has a connection 106 in which a second metallic conduit 107 is inserted. This conduit 107 is connected by the connection 114 at its other end to the opening 90 in the dome-shaped casing 80.

Arranged between the two headers are coils of copper pipe 108. These coils are wound in the shape of a helix and connected at their upper ends with the upper header 100 and at their lower ends with the lower header 101. These coils 108 are arranged at each side of a vertical plane extending through the headers 100 and 101, as shown in Fig. 2. They are eight in number, four being on each side of the plane and arranged in parallel relation to each other along the headers. These coils are wound in square or rectangular form so that the maximum amount of pipe can be arranged in the minimum amount of space so as to provide as much cooling surface as possible.

The gaseous refrigerant, which is forced into the upper header by means of the compressor, is cooled as it passes through the condensing coils 108. This cooling action changes the gaseous refrigerant to a liquid. This co'oling action is effected by means of a current of air which is forced, by the fan 74 through the aperture 23 in the dividing partition 21 around the condensing coils and out through the louvers in the upper part of the enclosing casing. As the refrigerant turns to a liquid form it flows downward into the lower header and from there into the dome 80.

The right-hand ends of the headers 100 and 101 are connected together by means of a conduit 109. This conduit is bent to form a trap 110. The purposeof this conduit 109 isto drain any lubricating oil which might have been deposited in the upper header so that this oil will not pass through the condensing tubes and thereby hinder the free passage of refrigerant. The trap 110 is provided in the conduit 109 so that gaseous refrigerant is prevented from taking a shortcut from the upper to the lower header without going through the condensing tubes 108.

It will be seen that I have arranged the lower end of the air-cooled condenser above the discharge valve of the compressor. This permits a gravity flow of the liquid refrigerant from the condenser to the discharge valve by means of the goose-neck tube 94 described above. The above described operation provides an efficient cooling means for the discharge valve and compressor cylinder.

The complete apparatus is shown diagranr matically in Fig. 4. The compressor condenser unit is designated by reference character 1 and the space to be cooled by 116 and the vaporizer by 117, the vaporizer being of the flooded type. Leading from the compressorcondenser unit to the vaporizer are three con duits designated by the reference characters 118, 119 and 120. The conduit 118 leads from the connection 92 to the inlet connection 121 of the vaporizer. As described above, the connection 92 registers with a passageway 91 which opens into the lower end of the condenser sump or dome 80. This conduit 118 transfers the liquid refrigerant from the dome to the vaporizer. The conduit 119 is connected at its upper end to the outlet connection 122 of the vaporizer and is connected at its lower end to a connection 83 which is located on the side of the crank case of the compressor and registers with an opening therein. This conduit 119 serves to transfer the gaseous refrigerant from the vaporizer to the crank case of the compressor. The conduit 120 is connected at its upper end to the vaporizer by means of connection 123 and at its lower end to a low pressure sylphon (not shown) within the casing 124. The sylphon is provided. as will be readily understood, for the purpose of automatically controlling the operation of the unit from the low pressure side of the system. When the pressure goes above a certain predetermined amount in the vaporizer 117 the sylphon 124 will automatically close a motor switch (not shown) within the casing 124 and start the operation of the apparatus. \Vhen the pressure in the vaporizer falls below a predetermined amount the pressure on the sylphon will be relieved and the motor switch will be opened thereby stopping the operation of the motor. A further description of the particular construction of the sylphon and the motor switch is deemed unnecessary as this matter has been fully disclosed in my copending application Serial No. 475,344.

The connection 92 at the base of the compressor has a conduit 125 leading to another sylphon (not shown) within the casing 126 which also controls the motor. This conduit 125 is in communication with the high pressure side of the unit, that is, the lower part of the dome 80. If the pressure at this point rises above a certain point, the motor will be automatically stopped by the sylphon 126.

cylinder, the air-cooled condenser, the va porizer and their connecting tubes form a closed system for the circulation of the refrigerant material. I prefer to use sulphur dioxide as the refrigerant material for this apparatus; but this invention is not limited to this particular use as other materials will operate satisfactorily.

In this apparatus I prefer to use, as a lubricant, a suitable mineral oil. The properties of such a mineral oil have been fully set forth in copending application Serial No. 47 5,344. It need only be observed here that such oil-is soluble to some extent in liquid sulphur dioxide. This oil circulates throughout the system along with the sulphur dioxide, and performs the lubricating functions as set forth in my copending application referred to.

It will be noted that I have provided efficient manually operated cut-off valves. These valves are located in the connections 92,112, 121, 122 and 123. Cross sections of all these connections are shown in Figs. 5, 6 and 7. The purpose of these manually operated cut-off valves 'is to allow the several parts of the entire apparatus to be disconnected one from the other without losing a considerable amount of either gas or liquid refrigerant. This is highly desirable for shipping purposes, and also in case any part should get out of order.- This part could then be disconnected from the unitand repaired without affecting the remaining parts.

Referring first to Fig. 6 which shows the connection 92, it will be noted that the needle val e 127 is located ahead of the opening 128, which opening is connected to the condult 125. The connection 92 has a boss 129 formed thereon, through which extends the tapered passage 130. The stem of the needle valve extends through this passage and a packing 131. This packing is compressed by a threaded gland 132 which engages the side of the passage 130 in the boss 129. The valve stem has a squared outer end 133 or the reception of a tool to open and close the same. The tapered passage 130 in the boss 129 is tightlv closed at its outer end by means of a threaded plug 134, thus precluding any escape of refrigerant which might leak past the packing.

The operation of the needle valve and its related parts in connections 112. 121, 122 and 123 shown on page 4 of the drawing is identical with that just described. The needle valve 136 in connection 112 closes a passageway leading to a charging and purging opening 137 from the interior of the dome 53. This charging and purging opening 137 is closed by means of a plug 138 (see Fig. 7). The needle valves 139, 140 and 141 close the passageways which lead from the vaporizer to the conduits 118. 119 and 120 respectively. It will be readily seen that these valves can be closed and conduits 118, 119- and 120 be removed from the vaporizer without the loss of any refrigerant in the vaporizer. It will be observed upon an examination of Figs. 5 and 8 that the connection 123 is attached to a boss 1 12 on the connection 122, on the vaporizer side of the needle valve 140. The connection 123 is in communication with the interior of the vaporizer by means of a tube 143 which extends into' the connection 122 and through the passageway 144, which passageway leads from the connection 122 to the interior of the vaporizer. It will be seen that this tube 143 extends above the level of the liquid in the vaporizer. This places the low pressure sylphon in communication with the gaseous refrigerant in the vaporizer without any danger of any of the oil, which floats on the top of the liquid refrigrant clogging up this connection to the control sylphon.

The operation of the apparatus is as follows:

Gaseous refrigerant is drawn from i the crank case 52 into the cylinder by means of the compressorpiston, and forced out of it through the discharge valve into the upper part of the dome 80. From there it passes through opening 88 and by means of connec' tion 105 to the upper header 100 of the condenser. denser coils 108 and during its passage therethrough it is liquefied. The resulting liquid refrigerant flows by means of gravity through the conduit 107 to the opening 90 in the lower end of the dome. The refrigerant flows ,through the goose-neck tube to the discharge valve where it pours over the same and flows down the sides of the cylinder walls of the compressor and is afterward collected at the bottom of the dome. The coils 108 perform their function of condensing the gaseous refrigerant by virtue of-cooling air being forced by means of fan 7 4 up through the aperture in the partition 21 of the casing around the coils 108 and out through the louvers 25 in the casing. The liquid refrigerant is conducted from the lower endof the dome through connection 92 and conduit 118 to the vaporizer wherein the temperature of the refrigerant is raised due to the absorption of heat from the space to be cooled. The absorption of heat by the liquid refrigerant causes the same to be transformed into a gaseous state. As the transformation takes place the gas rises to the top of the vaporizer from whence it is conducted by means of conduit 119 to the crank case 52 of the compressor thus completing the cycle of operation.

By placing the condenser in a separate compartment above the motor-compressor unit, as has been disclosed, T am able to utilize the motor shaft in directly driving the cooling fan. This direct connection does away with such troublesome devices as belts, chains, gears or the like, which easily become worn, loose, or out of order in numerous ways, which are not true of a direct connection such as the present one. Also by placing the condenser above the motor-compressor 1 provide the gravity flow of liquid refrigerant over the discharge valve and cylinder walls of the compressor, thus producing a simple and efficient means of cooling these parts at all times.

The spring mounting, as will be readily understood, is provided for the motor compressor unit so that the .natural vibration of these parts during operation will not be transferred to its support. This spring serves as a cushioning means for the mechan- Thence it passes through the con-' ically operating parts. By providing the loop connections at 111 and at 113 in the copper conduits which connect the condenser with the motor-compressor unit, I am enabled to permit the vibration of the unit due to the moving parts and the cushioning means, and at the same time to prevent any damage to these copper conduits or to the condenser proper.

With the exception of the air-cooled condenser and the fan with its attaching means, the parts which go to make up this refrigerating unit are substantially of the same construction as the corresponding parts which comprise the water cooled unit which is described and claimed in my copending application Serial No. 475,344. The opening 89 is used as a charging and purging means for my water cooled unit, but as the opening 137 is sufiicient in this device I merely close the opening 89 by means of the plug 89. This is highly desirable from a manufacturing point of view as the same parts can be utilized in both units. The only difi'erence between the dome shaped casing here and the casing in the application referred to resides in the fact that I have eliminated the condenser coils in this unit. The connections to and from the casing are identical in both cases. In the motor in the application I have merely extended the shaft of the prior motor and attached a fan thereto. I have also removed the cover of the prior motor and provided the extension in its place to direct the flow of air from the fan 7 4. The motor proper, the gear casing, the compressor and the driving connections therefor and the vaporizer are identical in both cases.

While I have shown and described in some detail the preferred construction and preferred arrangement of the parts and devices, it will be understood that in all respects there can be wide variations without departing from the invention as defined in the appended claims.

What I claim as my invention is:

1. In refrigeration apparatus, a casing, a partition therein dividlng said casing into upper and lower compartments, an aperture in said partition, a motor having a vertlcally arranged shaft and a compressor geared to the lower end of said shaft, all located in the lower of said compartments; coils of pipe forming a refrigerant condenser arranged 1n the upper of said compartments, a fan connected to the upper end of said shaft for directing a current of air from the lower of said compartments through said aperture and around said coils of pipe.

2. In refrigeration apparatus, a motor driven compressor, an air-cooled condenser connected thereto, the lower end of the condenser being located above the upper end of the discharge valve of the said compressor, and conduit means through which liquid refrigerant will flow by gravity from the condenser to the discharge valve of the compressor.

3. In refrigeration apparatus, a motor driven compressor, an air-cooled condenser, the lower end of the condenser being located above the upper end of the discharge of the said compressor whereby a gravity flow of liquid can be maintained between the said condenser and the said compressor, and means for conducting liquid refrigerant to the dis charge end of the compressor from the said condenser to cool the same.

4. In refrigeration apparatus, a compressor having a cylinder, a chamber surrounding the said cylinder, a discharge valve in the cylinder opening into said chamber, inlet and outlet connections in the walls of said chamber, an air-cooled condenser connected at each end, respectively, to the inlet and outlet connections in said chamber and means attached to the inlet connection of said chamber for conducting the liquid refrigerant to said exhaust valve.

5. In refrigeration apparatus, a resiliently supported power driven compressor, a sump for liquid refrigerant rigidly connected to the compressor structure, coils of pipe form ing the condenser, means for cooling said condenser, means for connecting the concondenser to the said sump, said means comprising metallic conduits arranged in loops whereby vibratory movement of the compressor relative to the condenser is permitted.

6. In refrigeration apparatus, a motor driven compressor, a closed. chamber surrounding the discharge of said compressor, inlet and outlet connections in the walls of said chamber, a condenser having conduits connected to said chamber connections,

a vaporizer having conduits connected to said chamber and compressor, respectively, and manually operated cut-off valves located in the several conduits adjacent to the vaporizer, chamber and compressor so that the several parts of the unit can be disassembled without losing any considerable amount of refrigerant.

In testimony whereof, I hereunto affix my signature.

JOHN R. REPLOGLE.

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