US2716859A

US2716859A - Heat exchanger

Info

Publication number: US2716859A
Application number: US331378A
Authority: US
Inventors: William H Compton; John M Duff; Julian K Smith
Original assignee: Reliance Electric and Engineering Co
Current assignee: Reliance Electric and Engineering Co
Priority date: 1953-01-15
Filing date: 1953-01-15
Publication date: 1955-09-06
Anticipated expiration: 1972-09-06

Description

Sept. 6, 1955 w. H. COMPTON ETAL HEAT EXCHANGER 5 Sheets-Sheet 1 Filed Jan. 15, 1953 INVENTORS mam/w M CbMPw/v BY Jo/W Sept. 6, 1955 w. H. COMPTON ET AL. 2,716,859

HEAT EXCHANGER Filed Jan. 15, 1953 3 Sheets-Sheet 2 IN V EN TORS ML 1. MM M g; of MPTO/V BY Johw n4. gum- L/l/L/fl/V A. 5M/77/ p 1955 w. H. COMPTON ET AL HEAT EXCHANGER I5 Sheets-Sheet 5 Filed Jan. 15, 1953 IN V EN TORS ML .4 MM COMP 70/\ BY JOHN M DUFF United States Patent Office 2,7ii5,85 Patented Sept. 6, 1955 HEAT EXCHANGER William H. Compton, South Euclid, and John M. Duff and Julian K. Smith, Cleveland, Ohio, assignors to The Reliance Electric & Engineering Company Application January 15, 1953, Serial No. 331,373

11 Claims. (Cl. 57--liiti) The invention relates in general to heat exchangers and more particularly to heat exchangers on electric motors driving elongated machinery, such as yarn spinning frames.

Yarn spinning frames are those machines which carry a plurality of bobbins of roving and twisting and stretching this roving to produce yarn. The roving in the twisting and spinning process balloons out; and hence, there is a considerable windage load upon the machine, and further the yarn and roving is subject to the temperature and humidity conditions of the room in which the spinning frame or frames are located. Also, because of this ballooning and longitudinal movement of the roving, there is considerable lint produced as a waste product which gets into the atmosphere of the room. Several hundred bobbins may be placed on one machine and a great many machines or spinning frames may be placed in one room.

The frames are generally long relative to the height and width and are driven by a single shaft running longitudinally of the frame. The shaft is generally driven from one end by an electric motor and suitable speed reduction mechanism if desired. A typical spinning frame in the prior art utilized a 7.5 horsepower electric motor. Much of this horsepower was absorbed in. windage and friction in the roving. This windage and friction was uniform throughout the length of the spinning frame; hence, the heat produced by this Windage and friction would affect uniformly the temperature of the entire spinning frame and the yarn thereon. The motor located at one end of the frame would also have a heat loss since it is impossible to make a motor one hundred per cent efficient. This heat loss of the motor would raise the temperature of One end of the spinning frame. relative to the other end of the spinning frame; and hence, would affect non-uniformly the temperature and humidity ambient to those yarn and roving bobbins on the motor end of the spinning frame.

Recent developments have called for an increased number of bobbins on a given spinning frame which meant that the bobbins were built out over the motor which previously was exposed at one end of the frame. Also, the tendency is to drive the spinning frame at still higher speeds. Since the windage load increases approximately as the cube of the speed, it may readily be seen that a slight increase in speed will result in a considerable increase in input power required. Further, with the motor now concealed under one end of the frame, the possible air circulation around the motor is restricted, it is closer to the yarn bobbins at that end of the frame, and it must now deliver up to about 20 horsepower for the same spinning frame size which also results in greater heat loss from the motor and a greater temperature differential between the two ends of the spinning frame caused by the heat lost from the motor.

An object of the invention, consequently is to provide a heat exchanger on an electric motor driving a spinning frame.

Another object of the invention is to get rid of the waste heat from a motor driving a spinning frame.

Another object of the invention is to obtain a more uniform temperature from one end to the other end of a yarn spinning frame.

Another object of the invention is to provide a more uniform quality of yarn from all bobbins of a yarn spinning frame.

Another object of the invention is to provide a heat exchanger for an electric motor which may be quickly and easily detached and connected.

Another object of the invention is to provide a heat exchanger for an electric motor on a spinning frame which may be quickly connected and which may be connected in any reversible or rotatable position without regard for inlet and outlet, yet be completely satisfactory in operation.

Another object of the invention is to provide for cooling the electric motor driving a spinning frame by the use of a fluid which passes through conduits out of the room in which the spinning frame is located to get rid of the waste heat of the motor.

Another object of the invention is to provide a heat exchanger for an enclosed electric motor wherein any condensation of moisture within the heat exchanger after the motor is shut off and cooled down will not drip upon any motor windings.

Another object of the invention is to provide an airwater heat exchanger exterior to an electric motor wherein the heat exchanger is a quickly separable cartridge having clamps which are gasketed to provide a totally closed air path, and yet the clamps being quickly separable to clamp and release the cartridge.

Another object of the invention is to provide a heat exchanger for an electric motor wherein the heat exchanger is exterior of the motor and is a quickly separable, straight cartridge so that when removed the air inlet and outlet remaining on the motor face each other to aid recirculation of air, to inhibit the passage of the motor heated air into the room, and to inhibit the suction of the lint-laden room atmosphere into the motor windings.

Another object of the invention is to provide an airwater heat exchanger for an electric motor wherein the heat exchanger is a quickly separable cartridge which may be easily and quickly replaced while the motor is running; and hence, is especially useful where the cooling water may have mineral or scale deposits which would plug up the heat exchanger and necessitate changing the heat exchanger for a clean one.

Still another object of the invention is to provide an air-water heat exchanger quickly separable from and external of an electric motor which may be quickly removed and replaced by only one tradesman without necessity for an electrician to disconnect the wiring, a

A millwright to disconnect the clamps and belts, and a plumber to disconnect the water connections on the heat exchanger.

Other objects and a fuller understanding of this invention may be had by referring to the following description and claims, taken in conjunction with the accompanying drawings, in which:

Figure l is a perspective view of a spinning frame and driven by an electric motor having an external heat exchanger;

Figure 2 is an end view of the motor and heat exchanger; and

Figure 3 is a sectional view on the line 3-3 of Figure 2.

The Figure 1 shows a spinning frame 11 located in a room 12. The spinning frame 11 has a multitude of roving bobbins l3, and the roving from these bobbins is pulled and twisted in the frame at balloons 14 to be wound upon yarn bobbins A main shaft 16 runs the length of the frame 1'1 and power is taken off this shaft to drive the various parts of the entire frame. The shaft 16 is driven by a belt drive 17 from an electric motor 18. The electric motor 18 has an external cartridge heat exchanger 19.

The Figures 2 and 3 better show the construction of the motor 18 and heat exchanger 19. The motor 18 has a frame which is generally cylindrical with open ends. The frame 25 carries motor windings 26 as part of the stator 27.

End bells

28 and 29 are provided for the motor frame, and a motor shaft 3t is journalled in these end bells. A rotor 31 is fastened to the shaft to cooperate with the stator 27. A belt pulley 32 is keyed to one end of the shaft 30. An internal centrifugal blower 33 is keyed to the shaft 30.

The end bell 28 has an air outlet 36 and the end bell 29 has an air inlet 37. This inlet and this outlet have axes which are spaced and generally parallel. An outlet elbow 38 is connected to the air outlet 36 by screws 39 passing through the flange 4i). Similarly, an inlet elbow 41 is fastened to the air inlet 37. The elbows 38 and 41 have circular openings 42 and 4-3, respectively, which face each other and are co-axial. A semi-cylindrical cradle 44 is provided on each circular opening 42 and 43. The heat exchanger 19 includes a jacket or cartridge 47 which will rest in these cradles 44. The cartridge 47 is generally cylindrical and a straight hollow tube so that the ends thereof lie closely adjacent the circular openings 42 and 43.

A semi-cylindrical strap 48 is hinged at 49 to each of the cradles 44. Each of the straps has a hooked end 50. A U-shaped nut 51 is hinged at 52 to each of the cradles 44. A bolt 53 is threaded in the nut 51 and engages the hooked end of the strap 48. The U-shaped nut 51, bolt 53, and strap 48 comprise a quick disconnect fastener 54 which may readily be fastened or unfastened by a few turns of the bolt 53 to fasten or unfasten the cartridge 47. Gasket material 55 is provided in the cradles 44 and straps 48 to obtain a closed air path from the interior of the motor frame 25 through the cartridge 47.

Water tubing is provided inside the cartridge 47. This water tubing has edge Wound radiating fins 61 thereon. The tubing 60 is coiled into two concentric helices; and hence, the inlet 62 and outlet 63 are both at one end of the cartridge 47. Quick disconnect couplings 64 are connected to the inlet 62 and outlet 63. These couplings 64 contain automatic shut-offs inside and are connected to flexible conduits 65. As best shown in Figure 1, the conduits lead to water inlet and outlet pipes 67 and 68, respectively. These inlet and outlet pipes would preferably be trenched into the floor of the room 12 and would lead outside this room. Other taps could be provided on these pipes 67 and 63 to service additional spinning frames within the room 12.

The entire motor is pivotally supported by a pivot 71 from the floor of the room 12, and suitable adjustment means 72 are provided to tiltably pivot the motor 18 for belt tightening and removal. An electrical junction box 73 is provided on the motor frame 25 to provide external electrical connections to the motor windings 26.

A weep hole 74 is provided in the frame 25 to permit any condensed moisture to run out of the motor 18.

Operation The Figure 1 shows that the motor 18 is located beneath one end of the spinning frame 11. The latest trends in spinning rames are to place more bobbins 13 and 15 on a given frame length, and this has been done by extending the supports for the bobbins over the motor 18 which formerly was left exposed. Further, the spinning frames are being driven at a higher speed which requires a greater power input. This greater power input and increased load means that a larger motor is i that the entire cartridge 47 could be removed.

required, and it is more closely confined so that the lost heat thereof affects nonuniformly and adversely the quality of the yarn from the various bobbins. The heat exchanger 19 gets rid of most of the waste heat of the notor 18 and carries it out of the room by means of the water outlet pipe 68. When the motor 18 is running and driving the main shaft 16 of the spinning frame 11, the internal blower 33 will be in operation to circulate air from the interior of the motor frame 25 through the cartridge 47 and back to the interior of the motor. With the water inlet pipe 67 connected to a source of water pressure and the pipe 68 connected to a drain, water will circulate through the tubing 66 to cool the air passing through the cartridge 47. Thus, the heat picked up by the air in circulating through the interior of the motor 18 will be passed to the fins 61, the tubing 69, and the water inside the tubing to be passed outside the room 12. Many spinning mills have a water tower on the roof wherein cooling water is recirculated for cooling. Thus, the water from the outlet pipe 63 would be pumped back to this water tower for cooling.

Air-water heat exchangers have previously been used on electric motors; however, they have been built into the frame of the motor as an integral part thereof. A primary feature of this invention is that the heat exchanger 19 includes a quickly separable cartridge 47. Further, this cartridge 47 may be removed for cleaning or replacement by only a single tradesman. in the case of motors with built-in water heat exchangers, it would be necessary to shut down the machine and shut off the motor. It would then be necessary for an electrician to disconnect the wiring to the motor. Next, it would be necessary for a millwright to disconnect the motor and the belt drive. Next, a plumber would be required to disconnect the water connections to the heat exchanger.

The same three separate tradesmen would be required to perform their functions, in reverse sequence, in order to reconnect a clean heat exchanger. With the growing tendency toward specialization by tradesmen and the increasing number of regulations, this down time of the machine would be quite extensive. In contrast, the instant invention provides a quickly separable heat exchanger cartridge 47 which may be completely disconnected and removed and replaced by a single tradesman, and this while the motor and machine are running. The single tradesman would slide back the sleeves 011 the quick disconnect coupling 64 to separate these couplings from the cartridge 47. Next, a few turns on the bolts 53 would release the quick disconnect fasteners 54 so A clean cartridge 47 could then be placed in operation by a re verse sequence of these operations by the same single tradesman. A heat exchanger cartridge 47 may easiiy be completely changely within three minutes on motors 7 actually built.

' inlet elbow 41.

An additional feature of this invention is that the circular openings 42 and 4-3 face each other so that during the short time that the cartridge 47 is not in place air will tend to recirculate from the outlet elbow 33 to the This inhibits passage into the room 12 of motor heated air and also inhibits entrance into the motor windings of lint-laden air from the room 12. This is an important consideration because lint from the air in the room would quickly contaminate the motor windings 26 and thus prevent good air circulation around the windings for cooling. Further, since lint is highly inflammable, the prevention of lint reaching the interior of the motor frame 25 even during changing the cartridge 47 is an important safety consideration.

Class A insulation on motor windings is that in which a maximum temperature of 10 is permitted. This heat exchanger 19 is designed to maintain the temperature of the motor windings 26 below this maximum tempera ture of C. in a typical installation the maximum temperature of water recirculated from a water tower would be 31 C. This means that the temperature of the water at the water inlet 67 would be a maximum of- 31 C. with a flow of water of one-half gallon per minute, for example, the water outlet temperature might be about 41 C. The temperature of the air coming into the cartridge 47 might be about 55 C., and-the temperature of the air going out of the cartridge 47 might be about 42 C. This would maintain the air temperature at the center of the motor windings 26 below 95 C. which is well within the permissible temperature limits. The temperature of the room 12 for most spinning mills is generally rather high and humid. This temperature might be 35 C. to 40 C., especially in the summertime. Thus, under usual conditions if the cartridge 47 is removed, there will be some room air that enters the inlet elbow 41; and hence, the motor 18 will operate cooler with the cartridge 47 removed then it would with the cartridge in place. This is another feature of the invention for it permits operation of the motor 18 and spin ning frame 11 even though the heat exchanger cartridge 47 is being changed or must be removed entirely for some emergency reasons.

The external heat exchanger 19 on the motor 18 for driving the spinning frame 11 is extremely desirable where the water source might be river Water, for example, or

any other conditions where excessive dirt, mineral, or scale deposits might occur. Under such conditions the heat exchanger cartridge 47 might need to be removed frequently for cleaning. Because of the quick and easy exchange of cartridges 47, such exchange may be effected with the motor in operation.

The cartridge 47 is a straight cylindrical tube which may be reversed end for end and still fit the cradles 44. Further, the water inlet and

outlet

62 and 63 are identical so that the flexible conduits 65 with the quick disconnect 1..

couplings 64 may be connected to either the inlet or the outlet for equally satisfactory operation. Thus, it is practically impossible to insert and connect cartridge 47 improperly. The gasket material 55 makes a sealed air path to prevent all foreign matter from entering the interior of the cartridge 47 and motor 18. When the motor is shut down and cooled ofl, air inside the motor 18 and heat exchanger 19 may have sufficient moisture therein to form condensation. This moisture condensation will drip down through the end bells and exit through the Weep holes '5 74. No condensation can drip on or damage the motor windings 26, such as would be the case for water heat exchangers built into the frame of the motor.

Although this invention has been described in its preferred form with a certain degree of particularity, it is 5:1:

understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

What is claimed is:

1. Cooling means for an electric motor driven spinning machine in a room and having a plurality of yarn spinning bobbins, conduit means extending out of said room, said electric motor being located at one end of said machine and the lost heat of which affecting non-uniformly the temperature of said various bobbins and hence affecting non-uniformly the quality of the spun yarn, said cooling means including means for totally enclosing said motor, second conduit means externally mounted on said motor, means to interconnect said conduit means, blower means to pass the internal gas of said motor to said second conduit means to pass motor beat out of the room containing said spinning machine to reduce the heat transferred from said motor to said spinning machine to achieve a more uniform quality of spun yarn.

2. A combined heat exchanger and electric motor for driving a machine in a room, a fluid drain and a fluid pressure source having a given temperature range and located outside said room, said electric motor being located at one end of said machine and the lost heat of which affecting non-uniformly the temperature thereof, said combined heat exchanger and motor including means for substantially totally enclosing said motor, heat exchange means externally mounted on said motor, blower means to circulate the internal gas of said motor through said heat exchange means to pass motor heat thereto, inlet and outlet fluid conduit means connected to said heat exchange means, means to connect said conduit means to said fluid pressure source and drain to reduce the heat transferred from said motor to said machine, the temperature range of the fluid at the inlet conduit and the efliciency of the heat exchange means being such that said motor operates cooler with said heat exchange means disconnected.

3. A combined heat exchanger and electric motor for driving a spinning machine in a room and having a plurality of yarn spinning bobbins, a fluid drain and a fluid pressure source having a given temperature range and located outside said room, said electric motor being located at one end of said machine and the lost heat of which affecting non-uniformly the temperature of said various bobbins, said combined heat exchanger and motor.

inciuding heat exchange means, means to circulate the internal gas of said motor through said heat exchange means to pass motor heat thereto, inlet and outlet fluid conduit means connected to said heat exchange means, means to connect said conduit means to said fluid pressure source and drain to reduce the heat transferred from said motor to said spinning machine, the temperature range of the fluid at the inlet conduit and the efliciency of the heat exchange means being such that said motor operates cooler with said'heat exchange means discon nected.

4. A combined heat exchanger and electric motor for driving a spinning machine in a room and having a plurality of yarn'spinning bobbins, a fluid drain and a fluid pressure source having a given temperature range and located outside said room, said electric motor being located at one end of said machine and the lost heat of which affecting non-uniformly the temperature of said various bobbins and hence affecting non-uniformly the quality of the spun yarn, said combined heat exchanger and motor including means for substantially totally enclosing said motor, heat exchange means externally mounted on saidmotor, blower means to circulate the internal gas of said motor through said heat exchange means to pass motor heat thereto, inlet and outlet fluid conduit means connected to said heat exchange means, means to connect said conduit means to said fluid. pressure source and drain to reduce the heat transferred from said motor to said spinning machine to achieve a more uniform quality of spun yarn, the temperature range of the fluid at the inlet conduit and the efliciency of the heat exchange means being such that said motor operates cooler with said heat exchange means disconnected.

5. A combined heat exchanger and electric motor for driving a spinning machine in a room and having a plurality of yarn spinning bobbins, a water drain and a water pressure source having a given temperature range and located outside said room, said electric motor being located at one end of said machine and the lost heat of which affecting non-uniformly the temperature of said various bobbins and hence afl'ecting non-uniformly the quality of the spun yarn, said combined heat exchanger and motor including means for totally enclosing said motor, water heat exchange means externally mounted on said motor, blower means to circulate the internal air of said motor through said heat exchange means to pass motor heat to the water therein, inlet and outlet water conduit means connected to said heat exchange means, means to connect said conduit means to said fluid pressure source and drain ,to reduce the heat loss from said motor to said spinning machine to achieve a more uniform quality of spun yarn,

the temperature range of the water at the inlet conduit and the efficiency of the heat exchange means being such that said motor operates cooler without being connected to said water heat exchange means.

6. A combined air-water heat exchanger and electric motor for driving a spinning frame in a room having a lint-laden atmosphere and with the frame having a plurality of yarn spinning bobbins, a water drain and a water pressure source having a given temperature range and located outside said room, said electric motor being located at one end of said frame and the lost heat thereof affecting non-uniformly the temperature and hence the quality of the yarn on the various bobbins, said motor being a totally enclosed motor having a frame containing motor windings, said combined heat exchanger and motor comprising an inlet and an outlet on said motor frame, said inlet and outlet having circular openings facing each other and generally coaxial, a cradle as part of each circular opening, a hollow cylindrical heat exchanger cartridge receivable in said cradles with the open ends of said cartridge in close proximity to said circular openings, quick disconnect fasteners engaging said cradles and said jacket to fasten said jacket to said inlet and outlet and complete the air path from said motor through said jacket, blower means to circulate air within said motor and through said jacket, water tubing within said jacket, :1 water inlet and outlet extending from said tubing through the wall of said jacket, quick disconnect fittings on said water inlet and outlet to connect to said water source and drain, said jacket being quickly removable with said motor and spinning frame in operation by manipulating said quick disconnect fasteners and fittings since air tends to circulate from said outlet opening to said inlet opening to inhibit the suction of said lint-laden atmosphere into said motor windings and to inhibit the passage of the motor heated air into said room.

7. A combined air-water heat exchanger and electric motor for driving a spinning frame in a room having a lint-laden atmosphere and with the frame having a plurality of yarn spinning bobbins, a water drain and a water .5

pressure source having a given temperature range and, located outside said room, said electric motor being located at one end of said frame and the lost heat thereol affecting non-uniformly the temperature and hence the quality of the yarn on the various bobbins, said motor being a totally enclosed motor having a frame containing motor windings, said combined heat exchanger and motor comprising first and second end bells for said motor fastened to said frame, an inlet on said first end bell and an outlet on said second end bell, said inlet and outlet having circular openings facing each other and generally coaxial, the distance between said openings being less than four times the diameter thereof. a semi-cylindrical cradle as approximately half of each circular opening, a hollow cylindrical heat exchanger jacket receivable in said cradles with the open ends of said jacket in close proximity to said circular openings. quick disconnect fasteners having gasket liners and engaging said cradles and said jacket to fasten said jacket to said inlet and outlet and complete the air path from said motor through said jacket, blower means in said motor to circulate air within said motor and through said jacket, water tubing within said jacket, a water inlet and outlet extending from said tubing through the wall of said jacket, quick disconnect fittings on said water inlet and outlet to connect to said water source and drain, said jacket being quickly removable for cleaning or replacement by manipulating said quick disconnect fasteners and fittings and in the meantime said motor being operable since air tends to circulate from said outlet opening to said inlet opening to inhibit the suction of said lint-laden atmosphere into said motor windings and to inhibit the passage of the motor heated air into said room.

8. An air-water heat exchanger for a totally enclosed motor having a frame containing motor windings, comprising first and second end bells for said motor fastened lll to said frame, an inlet on said first cud bell and an outlet on said second end bell, said inlet and outlet having spaced axes generally parallel and generally perpendicular to the motor axis, an inlet elbow and an outlet elbow on said inlet and outlet, respectively, said elbows having circular openings facing each other and generally coaxial, the distance between said openings being approximately three times the diameter thereof, a semi-cylindrical cradle as part of the lower half of each circular opening, a hollow cylindrical heat exchanger jacket receivable in said cradles with the open ends of said jacket in close proximity to said circular openings, quick disconnect fasteners having gasket liners and engaging said cradles and said jacket to fasten said jacket to said elbows and complete the air path from said motor through said jacket, blower means in said motor to circulate air within said motor and through said jacket, a double helix of finned water tubing within said jacket, a water inlet and outlet extending from said tubing through the wall of said jacket, and quick disconnect fittings on said water inlet and outlet,

9. A combined air-water heat exchanger and an electric motor for driving a spinning frame in a room having a lint-laden atmosphere and with the frame having a plurality of yarn spinning bobbins, said electric motor being located at one end of said frame and the lost heat thereof affecting non-uniformly the temperature and hence the quality of the yarn on the various bobbins, said motor being a totally enclosed motor having a frame containing motor windings, said combined heat exchanger and motor comprising first and second end bells for said motor fastened to said motor frame. an inlet on said first end bell and an outlet on said second end bell, said inlet and outlet having spaced axes generally parallel and generally perpendicular to the motor axis, an inlet elbow and an outlet elbow on said inlet and outlet, respectively, said elbows having circular openings facing each other and generally coaxial, the distance between said openings being less than three times the diameter thereof, a semi-cylindrical cradle as part of the lower half of each circular opening, a hollow cylindrical heat exchanger jacket receivable in said cradles with the open ends of said jacket in close proximity to said circular openings, substantially identical quick disconnect fasteners having gasket liners and en gaging said cradles and said jacket to fasten said jacket to said elbows and complete an air path from said motor through said jacket, blower means in said motor to circulate air within said motor and through said jacket, a double helix of finned water tubing within said jacket, a water inlet and outlet extending from said tubing through the wall of said jacket, substantially identical quick disconnect fittings on said water inlet and outlet, said jacket being quickly removable for cleaning or replacement by manipulating said quick disconnect fasteners and fittings and in the meantime said motor and spinning frame being operable since air tends to circulate from said outlet opening to said inlet opening to inhibit the suction of said lint-laden atmosphere into said motor windings and to inhibit the passage of the motor heated air into said room.

10. An air-water heat exchanger for an electric motor driven spinning frame in a room having a lint-laden atmosphere and with the frame having a plurality of yarn spinning bobbins, said electric motor being located at one end of said frame and the lost heat thereof affecting nonuniformly the temperature and hence the quality of the yarn on the various bobbins, said motor being a totally enclosed motor having a frame containing motor windings, first and second end bells for said motor fastened to said motor frame, an inlet on said first end bell and an outlet on said second end bell. said inlet and outlet having spaced axes generally parallel and generally perpendicular to the motor axis, an inlet elbow and an outlet elbow on said inlet and outlet, respectively, said elbows having circular openings facing each other and generally coaxial, the distance between said openings being less than 15 three times the diameter thereof, a semicylindrical cradle as part of the lower half of each circular opening, and blower means in said motor to circulate air through said motor from one elbow to the other, said heat exchanger comprising a hollow cylindrical heat exchanger jacket receivable in said cradles with the open ends of said jacket in close proximity to said circular openings, substantially identical quick disconnect fasteners having gasket liners and engageable with said cradles and said jacket to fasten said jacket to said elbows and complete an air path from said motor through said jacket, a double helix of finned water tubing within said jacket, a water inlet and outlet extending from said tubing through the wall of said jacket, substantially identical quick disconnect fittings on said water inlet and outlet, said jacket being quickly removable for cleaning or replacement by manipulating said quick disconnect fasteners and fittings and in the meantime said motor and spinning frame being operable since air tends to circulate from said outlet opening to said inlet opening to inhibit the suction of said lint-laden atmosphere into said motor windings and to inhibit the passage of the motor heated air into said room.

11. A powered spinning frame for use in a room with the frame having a plurality of yarn spinning bobbins creating a lint-laden atmosphere, a water drain and a water pressure source having a given temperature range and located outside said room and substantially out of heat exchange relationship with said room, said spinning frame including a water cooled electric motor for powering same, said electric motor being located at one end of said frame and the lost heat thereof affecting non-uniformly the temperature and hence the quality of the yarn on the various bobbins, said motor being a totally enclosed motor having a frame containing motor windings, first and second end bells for said motor fastened to said motor frame, an inlet on said first end bell and an outlet on said second end bell, said inlet and outlet having spaced axes generally parallel and generally perpendicular to the motor axis, an inlet elbow and an outlet elbow on said inlet and outlet, respectively, said elbows having circular openings facing each other and generally coaxial, the distance between said openings being less than three times the diameter thereof, a semi-cylindrical cradle as part of the lower half of each circular opening, and blower means in said motor to circulate air through said motor from one elbow to the other, a hollow cylindrical heat exchanger jacket receivable in said cradles with the open ends of said jacket in close proximity to said circular openings, substantially identical quick disconnect fasteners having gasket liners and engageable with said cradles and said jacket to fasten said jacket to said elbows and complete an air path from said motor through said jacket, a double helix of finned water tubing within said jacket, a water inlet and outlet extending from said tubing through the wall of said jacket, substantially identical quick disconnect fittings on said water inlet and outlet to connect to said water source and drain, said jacket being quickly removable for cleaning or replacement by manipulating said quick disconnect fasteners and fittings and in the meantime said motor and spinning frame being operable since air tends to circulate from said outlet opening to said inlet opening to inhibit the suction of said lint-laden atmosphere into said motor windings and to inhibit the passage of the motor heated air into said room.

References Cited in the file of this patent UNITED STATES PATENTS 2,488,387 Elsey Nov. 15, 1949 FOREIGN PATENTS 110,916 Great Britain Nov. 15, 1917 684,240 France June 23, 1930