CA1062215A - Hermetically encapsulated refrigerant compressor - Google Patents
Hermetically encapsulated refrigerant compressorInfo
- Publication number
- CA1062215A CA1062215A CA266,350A CA266350A CA1062215A CA 1062215 A CA1062215 A CA 1062215A CA 266350 A CA266350 A CA 266350A CA 1062215 A CA1062215 A CA 1062215A
- Authority
- CA
- Canada
- Prior art keywords
- stator
- disc
- compressor unit
- compressor
- rotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Windings For Motors And Generators (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Compressor (AREA)
- Motor Or Generator Frames (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to a hermetically encapsulated refrigerant compressor comprising a supporting member having a compressor at the top, the stator of an electric motor secured to the bottom and a downwardly projecting bearing for the drive shaft carrying the rotor, wherein on one side of the stator the end connection conductors of at least one winding section are passed substantially along chords across the cross-section disposed within the internal diameter of the stator and are supported by a device which is particularly of plastics, extends between these end connection conductors and the rotor and is fixed with respect to the stator, and wherein on the other side of the stator there are winding heads beyond the internal diameter of the stator.
The invention relates to a hermetically encapsulated refrigerant compressor comprising a supporting member having a compressor at the top, the stator of an electric motor secured to the bottom and a downwardly projecting bearing for the drive shaft carrying the rotor, wherein on one side of the stator the end connection conductors of at least one winding section are passed substantially along chords across the cross-section disposed within the internal diameter of the stator and are supported by a device which is particularly of plastics, extends between these end connection conductors and the rotor and is fixed with respect to the stator, and wherein on the other side of the stator there are winding heads beyond the internal diameter of the stator.
Description
The invention relates to a motor compressor unit comprising a motor having a stator with an axial bore, a rotor mounted in the bore, a motor drive shaft carrying the rotor, a compressor, and means for supporting the compressor and the stator and having a bearing for the shaft; the stator having windings which extend transversely across one end of the stator bore and which leave an opening through which the bearing extends, an annular disc disposed intermediate the stator windingsand the rotor for supporting the stator windings, the disc having a diameter slightly less than the diameter of the stator bore and is provided with means for fixing the disc in position relative to the stator.
A refrigerant compressor of this kind is known, in which the chordlike end connection conductors are provided at the bottom of the stator and the supporting device has the form of a substantia~y closed cap, of which the edge is seated on the end of the packet of stator laminations, its main surface is intended to prevent a collision between the end connection conductors and the rotor, and which carries a central cylindrical projection serving as a shock absorber. The diameter of the cap is larger than the internal diameter of the stator. At the periphery, the cap is radially slotted and expands automatically after it has been pushed through the stator. Alternatively, a rigid cap of the same diameter as the internal stator diameter can also be used, in which spreading webs , , , .
.~ - 1 -:
,.. ..
.
~-' ' ~ . -':
- ' ; . -. , :
.. . .
lO~Z215 are provided at the outer periphery that must be passed through the grooves and that spread behind the packet of laminations in their final position. This type of assembly makes it necessary for the spacing between the end cGnneCtion conductors and the end face of the packet of stator lamin-ations to be slightly larger than the corresponding dimen-sion of the cap because otherwise there will be inadequate spreading or no spreading at all. The resultant play could become larger during operation and give rise to noise. In addition, the assembly itself is cumbersome.
The invention is based on the problem of providing a refrigerant compressor of the aforementioned kind, in which the creation of noise is prevented by the supporting .:
device and the assembly is simplified.
This problem is solved according to the invention in that the end connection conductors guided along chords are provided at the top of the stator and leave a passage for the main bearing between each other, and that the sup-porting device for the most part leaves a spacing between -itself and the packet of stator laminations and consists of an annular disc provided with holding means and having an outer periphery of smaller diameter than the internal diameter of the stator.
With this construction, use is made of the fact that the end connection conductors tend to sag under gravity during any oscillating movement. They therefore come to lie against the supporting device to an ever increasing extent - and in this way prevents movement of the supporting device I that may give rise to noise. This also applies if the support-~ ing device must initially be mounted with a certain play .', ' --~ - 2 -; c : ~ -:, . . . . . .
, ~ - , 10~2215 between the end connection conductors and the packet of stator laminations. At the top, however, no cap can be used because, since it is penetrated by the main bearing, it would have to be practically completely closed because then there could ; neither be the normal suction gas circulation in the region of the rotor nor withdrawal of the oil through the apertures in the suppor~ing member. In contrast, the annular disc pen-etrated by the main bearing leaves an adequate flow section free at the outer periphery. By reason of its small outer diameter, it can also be easily assembled. Surprisingly, it has been found that such an annular disc is a sufficient sup-port because the main consideration is the support of the cen-tral and consequently longer end connection conductors whereas the outer and thus shorter end connection conductors have an :
adequate stiffness possibly even without any support. It is a further advantage that the normal winding heads having a larger amount of conductor material can now dip into the oil sump, resulting in more intensive cooling. In addition, the motor is accessible from below, so that, during assembly, the supporting device will not hinder the introduction of centre-ing probes in the air gap between the rotor and stator.
` With particular advantage, arms adjoin the ex-terior of the annular disc perpendicular to the main direction in which the end connection conductors extend. These arms enable the support of the comparatively short outer end ` connection conductors.
The holding means may take several forms. For ex-ample, they may comprise two elastically yielding arms which .
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,: - ' . ~::: . . ,-lO~Z215 spring radially from the annular disc and are supported on the end of the l~minated stator. ~hese two arms are compara-tively easily pressed together. They may also serve as supporting arms for the outer end connection conductors.
~ esirably, the arms extend at an angle to the plane of the annular disc that is substantially normal to the motor axis, this resulting in easier compressibility and more stiffness in the built-in condition.
In addition, the arms may be provided with supporting feet extended in the peripheral direction so as to increase the supporting surface on the packet of stator laminations.
However, it is particularly preferred to use holding means which secure the supporting device to the main bearing.
Since the supporting device is secured by such holding means to the main bearing and thus to the supporting member, a support on the packet of stator laminations can be of compara-tively weak construction or completely omitted. In the last-mentioned case, there would no longer be any need to pay attention to an adaptation between the supporting devices and the spatial conditions between the end connection conductors and the packet of stator laminations.
It is even possible to secure the supporting de-vice to the main bearing such that the annular disc abuts against the end connection conductors under pre-stress. This even more intensively suppresses the tendency of these conductors to oscillate.
It is of particular advantage if the holding means comprise a collar that can be pushed over the outer peripheral ' ph/
.. , , ,,. . . -. - . .... : . . . .: . -: - ~ . - - - .:- ~ - .:
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lO~Z215 surface of the main bearing. This results in a uniform cir-cumferential engaging surf~ce which ensures a particularly good hold.
Further, a groove may be provided in the ou~er peripheral surface of the main bearing in which part o~ the collar engages. This results in an extraordinarily secure attachment.
In particular, the collar may be substantially cylindrical and have an internal bead elastically snapping into the groove. To achieve the elasticity, the cylindrical collar may be at least partially axially slotted.
In another embodiment, the collar converges sub-- stantially conically towards the rotor and is radially slotted or toothed at the inner periphery. With such a construction, the securing forces increase with an increase in the load on the annular disc caused by the end connection conductors.
The invention will now be described in more detail s with reference to examples illustrated in the drawing, wherein:
Fig. 1 is a diagrammatic longitudinal section through a hermetically encapsulated refrigerant compressor according to the invention;
:
Fig. 2 is a side elevation of the supporting device used in Fig. l;
Fig. 3, shown in the second page of drawings, is a plan view of the stator of a refrigerant compressor according to the invention with a section taken through the main bearing;
Fig. 4 is a plan view of the supporting element used ; in Fig. 3;
. ~
: . - 5 -ph/~
: ., . - :: : . . -: . . - :
-Fig. 5 is a section through the supporting element used in Fiq. 3;
Fig. 6 is a partial section together with a further example of the invention;
Fig. 7 is a section throu~h the unloaded supporting element of Fig. 6, and Fig. 8 is a plan view of the Fig. 6 supporting element.
The refrigerant compressor illustrated in Fig. l is suspended in a hermetically closed capsule l by means of springs 2~ The springs engage a supporting member 3 at the top of which there is a refrigerant compressor 4. The latter comprises a cylinder 5, a cylinder head 6 and a piston 8 driven through a connecting rod 7. At the bottom of the support-ing member 3 there is the stator 9 of the electric motor drive.
It comprises a packet lO of stator laminations and a stator winding ll which, at its lower end, has a normal winding head 12 disposed completely beyond the internal diameter 13 of the packet 10 of stator laminations and dipping into the oil sump -~ 14. Provided at the top there are end aonnection conductors i 20 15 of the main winding, which extend substantially along a - chord across the cross-section disposed within the internal diameter 13 of the stator, as more clearly shown in Fig. 3.
;~ The end connector conductors 16 of the auxiliary resistance winding, however, are placed around the outside of the internal diameter 13 of the stator.
The supporting member 3 further comprises a central main bearing 17 in which a motor shaft 18 is mounte~. This bearing is integral at the top with a crank l9 on which the con-necting rod 7 is mounted. Beneath the main bearing 17, the motor shaft 18 carries a packet 20 of rotor laminations, the .~ ~~ ., jrc:~ - 6 -short-circuiting rings 21 and 22 of its conductor cage being visible. An oil supply tuhe 23 projects into the oil sump 14.
The remainder of the oil distribution system by means of which oil is fed to the lubricating points in the main bearing 17 at the crank pin 19 and i~ the cylinder 5 and with which oil is also circulated for cooling purposes is not shown in more detail.
Only holes 24 in the supporting member 3 indicate that oil flowing off from the top can reach the motor chamber located " thereunder.
The end connection conductors 15 are supported by a supporting device 25. This consists of an annular disc 26 on which at least the internal conductors 15 of longer length are supported, and a collar 28 which is provided with axial slots 27 and, at the top end, with an internal bead 29 which is engaged in a groove 30 at the outer peripheral surface of the main bearing 17.
~ If outer and consequently shorter end connection conductors 15 "~
receive no support, this is generally of no consequence because ¦
they are stiffer by reason of their shorter length.
` During assembly, the motor shaft 18 is first of all ~ 20 inserted in the main bearing 17 and its crank pin 19 is connected -1 , .
: to the connecting rod 7. The stator 9 is then provisionally - attached to the supporting member 3. The supporting device 25 is now pu$hed onto the main bearing 17 through the free cross-section of the packet 10 of stator laminations until 'he bead ` 29 engages in the groove 30. The packet 20 of rotor laminations is thereafter shrunk onto the motor shaft 18 and the stator 10 is centred with respect to the rotor 20 and in this position secured to the supporting member 3. Finally, the assembled - unit is secured to the capsule 1 by way of :~
. . .
~ jrc: p~
,-, :: :
~ ' .' ` -. , - ' 10~;2'~15 the s~rings 2 and the capsule is closed.
During transport and operation, oscillations of the end connection conductors lS are wlavoidable. They cannot, however, - come into contact with the short-circuiting ring 21 of the rotor 20 because they are supported by the supporting device 25.
However, because of gravitational forces, deformation of the end connection conductors 15 are unavoidable in a downward direction. Such deformation leads to a more intensive abutment against the supporting device 25 and the resultant pre-stress reduces subsequent oscillations. One can even ensure during assembly that the annular disc 26 lies against the end connection conductors 15 under a certain amount of pre-stress so as to re-duce their tendency to oscillate. Particularly when the sup-porting device 25 consists of an elastically yielding material such as plastics, slight deformation can be used to apply a correspondingly large amount of pre-stress to this annular disc 26.
In the Fig. 3 embodiment, a supporting device 31 is used comprising a planar annular disc 32 surrounding the main .!
bearing 17 and two radial arms 33 serving as holding means which extend at an angle to the annular disc 32 and are provided with supporting feet 34 extend~d in the peripheral direction. These supporting feet rest on the end face 35 of the packet 10 of stator laminations.
This supporting device 31 can be built into the stator before the latter is secured to the supporting member 3. For this purpose it is merely necessary slightly to compress the two inclined arms 33 so that the supporting device 31 can be . , lrc:
. . . . ~ ..
introduced through the int:ernal cross-section of the stator 10.
In the final po~sition, the supporting feet 34 elastically increase their diameter and lie on the packet 10 of stator laminations. T~le play necessary for this is automatically re-duced during transport or operation when the end connection conductors 15 sag under their own weight.
; Fig. 3 indicates that the end connection conductors 15 at the centre are spread apart to such an extent that they form a passage 36 for the main bearing 17. The individual winding sections could also be axially superposed. In any case, a comparatively narrow annular disc 32 will suffice. The arms 33 -~ are orientated so that they can also serve as a support for - the shorter outer end connection conductors 15.
Fig. 6 to 8 illustrate a third embodiment in which ~: the supporting device 37 is shown to a larger scale in Figs. 7 and 8 than in Fig. 6. Again, an annular disc 38 is provided.
It comprises an arm 39 at each of two opposed sides. The holding means are formed by a collar 40 which conically con-verges towards the motor. Either radial incisions 41 or teeth `~l 20 42 are provided at its inner radius. Partly because of this configuration and partly because of the inherent elasticity of the material such as plastics, this supporting device 37 can be - pushed onto the main bearing 17 until the internal periphery of the collar 40 engages in the groove 30. In this embodiment, this takes place under pre-stress, so that the annular disc 38 bends downwardly adjacent to the arms 39, whereby its secure engagement in the groove 30 is increased further. The arms 39 ; do not here serve as holding means but merely for supporting the shorter outer end connection conductors 15.
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~ jrc:-~ ~ 9 ,: , . .. :
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Fig. 3 shows that the breadth of the annular disc can be kept so small that a considerable passage cross-section is left beyond it, through which there can be free circulation of the suction gases disposed in the motor chamber and through which oil can also flow downwardly without hindrance. It will also be evident that for such a supporting device a very small amount of material is necessary.
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A refrigerant compressor of this kind is known, in which the chordlike end connection conductors are provided at the bottom of the stator and the supporting device has the form of a substantia~y closed cap, of which the edge is seated on the end of the packet of stator laminations, its main surface is intended to prevent a collision between the end connection conductors and the rotor, and which carries a central cylindrical projection serving as a shock absorber. The diameter of the cap is larger than the internal diameter of the stator. At the periphery, the cap is radially slotted and expands automatically after it has been pushed through the stator. Alternatively, a rigid cap of the same diameter as the internal stator diameter can also be used, in which spreading webs , , , .
.~ - 1 -:
,.. ..
.
~-' ' ~ . -':
- ' ; . -. , :
.. . .
lO~Z215 are provided at the outer periphery that must be passed through the grooves and that spread behind the packet of laminations in their final position. This type of assembly makes it necessary for the spacing between the end cGnneCtion conductors and the end face of the packet of stator lamin-ations to be slightly larger than the corresponding dimen-sion of the cap because otherwise there will be inadequate spreading or no spreading at all. The resultant play could become larger during operation and give rise to noise. In addition, the assembly itself is cumbersome.
The invention is based on the problem of providing a refrigerant compressor of the aforementioned kind, in which the creation of noise is prevented by the supporting .:
device and the assembly is simplified.
This problem is solved according to the invention in that the end connection conductors guided along chords are provided at the top of the stator and leave a passage for the main bearing between each other, and that the sup-porting device for the most part leaves a spacing between -itself and the packet of stator laminations and consists of an annular disc provided with holding means and having an outer periphery of smaller diameter than the internal diameter of the stator.
With this construction, use is made of the fact that the end connection conductors tend to sag under gravity during any oscillating movement. They therefore come to lie against the supporting device to an ever increasing extent - and in this way prevents movement of the supporting device I that may give rise to noise. This also applies if the support-~ ing device must initially be mounted with a certain play .', ' --~ - 2 -; c : ~ -:, . . . . . .
, ~ - , 10~2215 between the end connection conductors and the packet of stator laminations. At the top, however, no cap can be used because, since it is penetrated by the main bearing, it would have to be practically completely closed because then there could ; neither be the normal suction gas circulation in the region of the rotor nor withdrawal of the oil through the apertures in the suppor~ing member. In contrast, the annular disc pen-etrated by the main bearing leaves an adequate flow section free at the outer periphery. By reason of its small outer diameter, it can also be easily assembled. Surprisingly, it has been found that such an annular disc is a sufficient sup-port because the main consideration is the support of the cen-tral and consequently longer end connection conductors whereas the outer and thus shorter end connection conductors have an :
adequate stiffness possibly even without any support. It is a further advantage that the normal winding heads having a larger amount of conductor material can now dip into the oil sump, resulting in more intensive cooling. In addition, the motor is accessible from below, so that, during assembly, the supporting device will not hinder the introduction of centre-ing probes in the air gap between the rotor and stator.
` With particular advantage, arms adjoin the ex-terior of the annular disc perpendicular to the main direction in which the end connection conductors extend. These arms enable the support of the comparatively short outer end ` connection conductors.
The holding means may take several forms. For ex-ample, they may comprise two elastically yielding arms which .
-~ ., ~ _ 3 _ jc~
,: . . -, - .. . .
- ~ . . : , ~ - , , : . . .
. ~ . ~ , : - . : - . -. - -.. : - . - - . .. -:- . : . . - ,: :
:: , . ~- - :,.
,: - ' . ~::: . . ,-lO~Z215 spring radially from the annular disc and are supported on the end of the l~minated stator. ~hese two arms are compara-tively easily pressed together. They may also serve as supporting arms for the outer end connection conductors.
~ esirably, the arms extend at an angle to the plane of the annular disc that is substantially normal to the motor axis, this resulting in easier compressibility and more stiffness in the built-in condition.
In addition, the arms may be provided with supporting feet extended in the peripheral direction so as to increase the supporting surface on the packet of stator laminations.
However, it is particularly preferred to use holding means which secure the supporting device to the main bearing.
Since the supporting device is secured by such holding means to the main bearing and thus to the supporting member, a support on the packet of stator laminations can be of compara-tively weak construction or completely omitted. In the last-mentioned case, there would no longer be any need to pay attention to an adaptation between the supporting devices and the spatial conditions between the end connection conductors and the packet of stator laminations.
It is even possible to secure the supporting de-vice to the main bearing such that the annular disc abuts against the end connection conductors under pre-stress. This even more intensively suppresses the tendency of these conductors to oscillate.
It is of particular advantage if the holding means comprise a collar that can be pushed over the outer peripheral ' ph/
.. , , ,,. . . -. - . .... : . . . .: . -: - ~ . - - - .:- ~ - .:
-~ . . ~ .. :
lO~Z215 surface of the main bearing. This results in a uniform cir-cumferential engaging surf~ce which ensures a particularly good hold.
Further, a groove may be provided in the ou~er peripheral surface of the main bearing in which part o~ the collar engages. This results in an extraordinarily secure attachment.
In particular, the collar may be substantially cylindrical and have an internal bead elastically snapping into the groove. To achieve the elasticity, the cylindrical collar may be at least partially axially slotted.
In another embodiment, the collar converges sub-- stantially conically towards the rotor and is radially slotted or toothed at the inner periphery. With such a construction, the securing forces increase with an increase in the load on the annular disc caused by the end connection conductors.
The invention will now be described in more detail s with reference to examples illustrated in the drawing, wherein:
Fig. 1 is a diagrammatic longitudinal section through a hermetically encapsulated refrigerant compressor according to the invention;
:
Fig. 2 is a side elevation of the supporting device used in Fig. l;
Fig. 3, shown in the second page of drawings, is a plan view of the stator of a refrigerant compressor according to the invention with a section taken through the main bearing;
Fig. 4 is a plan view of the supporting element used ; in Fig. 3;
. ~
: . - 5 -ph/~
: ., . - :: : . . -: . . - :
-Fig. 5 is a section through the supporting element used in Fiq. 3;
Fig. 6 is a partial section together with a further example of the invention;
Fig. 7 is a section throu~h the unloaded supporting element of Fig. 6, and Fig. 8 is a plan view of the Fig. 6 supporting element.
The refrigerant compressor illustrated in Fig. l is suspended in a hermetically closed capsule l by means of springs 2~ The springs engage a supporting member 3 at the top of which there is a refrigerant compressor 4. The latter comprises a cylinder 5, a cylinder head 6 and a piston 8 driven through a connecting rod 7. At the bottom of the support-ing member 3 there is the stator 9 of the electric motor drive.
It comprises a packet lO of stator laminations and a stator winding ll which, at its lower end, has a normal winding head 12 disposed completely beyond the internal diameter 13 of the packet 10 of stator laminations and dipping into the oil sump -~ 14. Provided at the top there are end aonnection conductors i 20 15 of the main winding, which extend substantially along a - chord across the cross-section disposed within the internal diameter 13 of the stator, as more clearly shown in Fig. 3.
;~ The end connector conductors 16 of the auxiliary resistance winding, however, are placed around the outside of the internal diameter 13 of the stator.
The supporting member 3 further comprises a central main bearing 17 in which a motor shaft 18 is mounte~. This bearing is integral at the top with a crank l9 on which the con-necting rod 7 is mounted. Beneath the main bearing 17, the motor shaft 18 carries a packet 20 of rotor laminations, the .~ ~~ ., jrc:~ - 6 -short-circuiting rings 21 and 22 of its conductor cage being visible. An oil supply tuhe 23 projects into the oil sump 14.
The remainder of the oil distribution system by means of which oil is fed to the lubricating points in the main bearing 17 at the crank pin 19 and i~ the cylinder 5 and with which oil is also circulated for cooling purposes is not shown in more detail.
Only holes 24 in the supporting member 3 indicate that oil flowing off from the top can reach the motor chamber located " thereunder.
The end connection conductors 15 are supported by a supporting device 25. This consists of an annular disc 26 on which at least the internal conductors 15 of longer length are supported, and a collar 28 which is provided with axial slots 27 and, at the top end, with an internal bead 29 which is engaged in a groove 30 at the outer peripheral surface of the main bearing 17.
~ If outer and consequently shorter end connection conductors 15 "~
receive no support, this is generally of no consequence because ¦
they are stiffer by reason of their shorter length.
` During assembly, the motor shaft 18 is first of all ~ 20 inserted in the main bearing 17 and its crank pin 19 is connected -1 , .
: to the connecting rod 7. The stator 9 is then provisionally - attached to the supporting member 3. The supporting device 25 is now pu$hed onto the main bearing 17 through the free cross-section of the packet 10 of stator laminations until 'he bead ` 29 engages in the groove 30. The packet 20 of rotor laminations is thereafter shrunk onto the motor shaft 18 and the stator 10 is centred with respect to the rotor 20 and in this position secured to the supporting member 3. Finally, the assembled - unit is secured to the capsule 1 by way of :~
. . .
~ jrc: p~
,-, :: :
~ ' .' ` -. , - ' 10~;2'~15 the s~rings 2 and the capsule is closed.
During transport and operation, oscillations of the end connection conductors lS are wlavoidable. They cannot, however, - come into contact with the short-circuiting ring 21 of the rotor 20 because they are supported by the supporting device 25.
However, because of gravitational forces, deformation of the end connection conductors 15 are unavoidable in a downward direction. Such deformation leads to a more intensive abutment against the supporting device 25 and the resultant pre-stress reduces subsequent oscillations. One can even ensure during assembly that the annular disc 26 lies against the end connection conductors 15 under a certain amount of pre-stress so as to re-duce their tendency to oscillate. Particularly when the sup-porting device 25 consists of an elastically yielding material such as plastics, slight deformation can be used to apply a correspondingly large amount of pre-stress to this annular disc 26.
In the Fig. 3 embodiment, a supporting device 31 is used comprising a planar annular disc 32 surrounding the main .!
bearing 17 and two radial arms 33 serving as holding means which extend at an angle to the annular disc 32 and are provided with supporting feet 34 extend~d in the peripheral direction. These supporting feet rest on the end face 35 of the packet 10 of stator laminations.
This supporting device 31 can be built into the stator before the latter is secured to the supporting member 3. For this purpose it is merely necessary slightly to compress the two inclined arms 33 so that the supporting device 31 can be . , lrc:
. . . . ~ ..
introduced through the int:ernal cross-section of the stator 10.
In the final po~sition, the supporting feet 34 elastically increase their diameter and lie on the packet 10 of stator laminations. T~le play necessary for this is automatically re-duced during transport or operation when the end connection conductors 15 sag under their own weight.
; Fig. 3 indicates that the end connection conductors 15 at the centre are spread apart to such an extent that they form a passage 36 for the main bearing 17. The individual winding sections could also be axially superposed. In any case, a comparatively narrow annular disc 32 will suffice. The arms 33 -~ are orientated so that they can also serve as a support for - the shorter outer end connection conductors 15.
Fig. 6 to 8 illustrate a third embodiment in which ~: the supporting device 37 is shown to a larger scale in Figs. 7 and 8 than in Fig. 6. Again, an annular disc 38 is provided.
It comprises an arm 39 at each of two opposed sides. The holding means are formed by a collar 40 which conically con-verges towards the motor. Either radial incisions 41 or teeth `~l 20 42 are provided at its inner radius. Partly because of this configuration and partly because of the inherent elasticity of the material such as plastics, this supporting device 37 can be - pushed onto the main bearing 17 until the internal periphery of the collar 40 engages in the groove 30. In this embodiment, this takes place under pre-stress, so that the annular disc 38 bends downwardly adjacent to the arms 39, whereby its secure engagement in the groove 30 is increased further. The arms 39 ; do not here serve as holding means but merely for supporting the shorter outer end connection conductors 15.
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,.
~ jrc:-~ ~ 9 ,: , . .. :
- .
Fig. 3 shows that the breadth of the annular disc can be kept so small that a considerable passage cross-section is left beyond it, through which there can be free circulation of the suction gases disposed in the motor chamber and through which oil can also flow downwardly without hindrance. It will also be evident that for such a supporting device a very small amount of material is necessary.
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Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A motor compressor unit comprising a motor having a stator with an axial bore, a rotor mounted in the bore, a motor drive shaft carrying the rotor, a compressor, and means for supporting the compressor and the stator and having a bearing for the shaft; the stator having windings which extend transversely across one end of the stator bore and which leave an opening through which the bearing extends, an annular disc disposed intermediate said stator windings and said rotor for supporting said stator windings, said disc having a diameter slightly less than the diameter of the stator bore and is provided with means for fixing the disc in position relative to the stator.
2. A compressor unit as claimed in claim 1, in which arms extend downwardly from the outer periphery of the annular disc and in a direction substantially perpendicular to the trans-versely extending windings.
3. A compressor unit as claimed in claim 1, in which the means for fixing the disc in position comprises two resiliently yieldable arms which extend radially from the annular disc and the ends of which are supported on one end of the stator laminations.
4. A compressor unit as claimed in claim 3, in which the arms extend downwardly at an angle to the plane of the annular disc.
5. A compressor unit as claimed in claim 3, in which the arms are provided with supporting feet which extend parallel to the periphery of the disc.
6. A compressor unit as claimed in claim 1 in which the means for fixing the disc in position are secured to the bearing.
7. A compressor unit as claimed in claim 6, in which the annular disc is secured to the bearing so that it abuts against the said windings under pre-stress.
8. A compressor unit as claimed in claim 6, in which the means for fixing the disc in position comprises a collar that can be forced over the outer peripheral surface of the bearing.
9. A compressor unit as claimed in claim 8, in which a groove is provided at the outer peripheral surface of the main bearing in which part of the collar engages.
10. A compressor as claimed in claim 9, in which the col-lar is substantially cylindrical and has an internal bead for resiliently snapping into the groove.
11. A compressor unit as claimed in claim 10, in which the cylindrical collar is at least partly axially slotted.
12. A compressor unit as claimed in claim 8, in which the collar converges substantially conically towards the rotor and is radially slotted or toothed at its inner periphery.
13. A compressor unit as claimed in claim 1, in which the disc is made of resilient material.
14. A compressor unit as claimed in claim 13, in which the disc is made of plastics material.
15. A hermetically encapsulated refrigerant compressor comprising a supporting member having a compressor at the top, the stator of an electric motor secured to the bottom and a downwardly projecting bearing for the drive shaft carrying the rotor, wherein on one end of the stator the end connection conductors of at least one winding section are passed substant-ially along chords across the cross-section disposed within the internal diameter of the stator and are supported by a device of an electrical insulating type which extends between these end connection conductors and the rotor and is fixed with res-pect to the stator, and wherein on the other end of the stator there are winding heads beyond the internal diameter of the stator, wherein the end connection conductors substantially guided along chords are provided at the top of the stator and leave a passage for the main bearing between each other, and that the supporting device for the most part leaves a spacing between itself and the packet of stator laminations and consists of an annular disc provided with holding means and having an outer periphery of smaller diameter than the internal diameter of the stator.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2552794A DE2552794B2 (en) | 1975-11-25 | 1975-11-25 | Electric drive motor for a hermetically sealed refrigerant compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062215A true CA1062215A (en) | 1979-09-11 |
Family
ID=5962560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA266,350A Expired CA1062215A (en) | 1975-11-25 | 1976-11-23 | Hermetically encapsulated refrigerant compressor |
Country Status (7)
| Country | Link |
|---|---|
| CA (1) | CA1062215A (en) |
| DE (1) | DE2552794B2 (en) |
| DK (1) | DK516076A (en) |
| FR (1) | FR2333371A1 (en) |
| GB (1) | GB1563351A (en) |
| IT (1) | IT1072037B (en) |
| SE (1) | SE415912B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4132609A1 (en) * | 1991-10-01 | 1993-04-08 | Teves Gmbh Alfred | Electric drive motor for pump and/or compressor - uses single point bearing for rotor so that other end of shaft can rotate free of bearing forces |
| DE4426959A1 (en) * | 1994-07-29 | 1996-02-01 | Teves Gmbh Alfred | Electric motor e.g. for vehicle ABS barking system |
| FR2734960A1 (en) * | 1995-02-14 | 1996-12-06 | Plumer Sa | ALTERNATING CURRENT ELECTRIC MOTOR |
| DE19516811C2 (en) * | 1995-05-08 | 1998-04-09 | Danfoss Compressors Gmbh | Refrigerant compressor |
-
1975
- 1975-11-25 DE DE2552794A patent/DE2552794B2/en not_active Withdrawn
-
1976
- 1976-11-17 DK DK516076A patent/DK516076A/en unknown
- 1976-11-23 FR FR7635227A patent/FR2333371A1/en active Granted
- 1976-11-23 CA CA266,350A patent/CA1062215A/en not_active Expired
- 1976-11-24 SE SE7613120A patent/SE415912B/en unknown
- 1976-11-24 IT IT69796/76A patent/IT1072037B/en active
- 1976-11-24 GB GB48956/76A patent/GB1563351A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IT1072037B (en) | 1985-04-10 |
| SE415912B (en) | 1980-11-10 |
| FR2333371A1 (en) | 1977-06-24 |
| DE2552794A1 (en) | 1977-05-26 |
| DK516076A (en) | 1977-05-26 |
| FR2333371B1 (en) | 1982-05-21 |
| SE7613120L (en) | 1977-05-26 |
| GB1563351A (en) | 1980-03-26 |
| DE2552794B2 (en) | 1980-03-27 |
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