US20110217189A1 - Refrigerant compressor - Google Patents
Refrigerant compressor Download PDFInfo
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- US20110217189A1 US20110217189A1 US12/733,384 US73338408A US2011217189A1 US 20110217189 A1 US20110217189 A1 US 20110217189A1 US 73338408 A US73338408 A US 73338408A US 2011217189 A1 US2011217189 A1 US 2011217189A1
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- Prior art keywords
- drive unit
- electric drive
- height
- cylinder housing
- compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
- F04B39/0223—Lubrication characterised by the compressor type
- F04B39/023—Hermetic compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/122—Cylinder block
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/127—Mounting of a cylinder block in a casing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/128—Crankcases
Definitions
- the present invention relates to a refrigerant compressor comprising an electric drive unit, a cylinder housing, a crankshaft which may be driven by the electric drive unit, and a piston, driven by the crankshaft and guided in the cylinder housing, which compresses the refrigerant.
- the present invention further relates to a family of refrigerant compressors of different refrigerating capacities, each refrigerant compressor comprising an electric drive unit, a cylinder housing, a crankshaft which may be driven by the electric drive unit, and a piston, driven by the crankshaft and guided in the cylinder housing, which compresses the refrigerant, wherein the electric drive unit of each refrigerant compressor in the family has a different height, depending on the refrigerating capacity.
- refrigerant compressors are well known, and are used primarily in household applications such as refrigerators or freezers, for example.
- Refrigerant compressors are situated in a hermetically sealed outer housing, and are part of a refrigerant circuit in which the refrigerant compressor compresses a gaseous refrigerant which is supplied from an evaporator to the piston/cylinder unit.
- the pressure and temperature increase during the compression.
- the refrigerant is converted to the liquid state in a condenser and is ultimately supplied by an expansion valve to the evaporator, where it is re-evaporated.
- the heat of vaporization necessary for this purpose is withdrawn from the surroundings, i.e., a cooling chamber, which is thereby cooled.
- the gaseous refrigerant is supplied once again from the evaporator to the piston/cylinder unit and goes through a new compression and expansion cycle.
- refrigerant compressors are offered with different refrigerating capacities.
- the component which essentially determines the refrigerating capacity of a refrigerant compressor is the electric drive used.
- the displacement and thus the piston size vary as well as the stroke itself, and therefore contribute to differing refrigerating capacities.
- the overall height of a refrigerant compressor is essentially determined by the height of the electric drive unit and the height of the cylinder housing mounted on the electric drive unit. Whereas the height of the cylinder housing is generally kept constant and only the cylinder diameter and the cylinder stroke vary slightly as a function of the refrigerating capacity, the height of the electric drive unit varies greatly as a function of the refrigerating capacity.
- the electric drive unit is generally a single phase asynchronous motor composed of a rotor and a stator together with winding stacks, the stator being designed as a core stack which greatly influences the height of the electric drive unit, as described in greater detail below.
- the refrigerant compressor itself is situated in a hermetically sealed outer housing having an entering suction line which conducts the refrigerant to the cylinder, and an exiting pressure line which delivers the compressed refrigerant to the condenser. Also located on the hermetically sealed housing is a connecting flange for electrical lines for supplying the drive unit inside with power.
- An oil sump for lubricating the moving parts of the refrigerant compressor is situated at the base of an operation-ready outer housing. Oil is conveyed to the lubrication points as a result of the rotation of the crankshaft itself, which for this purpose has two sections provided with different oil conveying means (oil conveying spindle, eccentric borehole).
- a number of refrigerant compressors having numerous identical components is referred to as a “compressor family.”
- the individual members of a compressor family differ from one another by virtue of the refrigerating capacity and/or the efficiency, and, primarily as the result of the electric drive unit used, outer housing, crankshaft, cylinder housing, etc., are thus identical or practically identical (exceptions: cylinder bore diameter, stroke, and various installation recesses) to allow economical production.
- These known height compensation elements are generally support elements together with springs mounted on the underside of the core stack which have different heights, depending on the height of the core stack.
- the height compensation elements Besides maintaining the overall height of the refrigerant compressors within a compressor family, the height compensation elements also allow identical crankshafts to be used in every case for each member of a compressor family, due to the fact that the height compensation elements consistently keep the cylinder housing, which has the main bearing for the crankshaft, at the same distance from the base of the outer housing, regardless of the height of the electric drive unit situated between the cylinder housing and the base of the outer housing. In this manner crankshafts of the same length may be used in all cases. Without the height compensation, due to the smaller distance between the cylinder housing and the base of the outer housing it would also be necessary to use shorter crankshafts for refrigerant compressors having smaller electric drive units.
- the object of the present invention is to avoid these disadvantages and provide a refrigerant compressor of the type mentioned at the outset which, regardless of the height of the electric drive unit used, ensures a stable oil supply to the moving parts by always keeping the pump height as low as possible relative to the bearing section of the crankshaft.
- a further aim of the present invention is to provide a compressor family of the type mentioned at the outset in which for each family member, regardless of the refrigerating capacity, the greatest possible main bearing length may be provided, based on the largest electric drive unit used.
- a further aim of the present invention is to provide a refrigerant compressor of the type mentioned at the outset which, regardless of the height of the electric drive unit used, always has an essentially constant height.
- a refrigerant compressor having an electric drive unit, a cylinder housing, a crankshaft which may be driven by the electric drive unit, and a piston, driven by the crankshaft and guided in the cylinder housing, which compresses the refrigerant
- at least one height compensation element is situated between the cylinder housing and the electric drive unit. This allows the electric drive unit to be increased in size upwardly in the direction of the cylinder housing while at the same time the main bearing is situated as low as possible in the vicinity of the oil sump.
- the main bearing length may be dimensioned on the basis of the largest electric drive unit, thus minimizing the bearing load and the losses from friction within a compressor family.
- the cylinder housing has at least one contact flange which is mounted on at least one corresponding contact surface of the electric drive unit, and the at least one height compensation element is situated between the contact flange and the contact surface.
- the electric drive unit is a single phase asynchronous motor
- the contact surface is the core stack of the stator of the single phase asynchronous motor.
- the contact flange, contact surface, and height compensation element are preferably connected to one another by a screw connection which is preferably guided in a borehole or another type of recess in the height compensation element.
- each refrigerant compressor in the compressor family includes an electric drive unit, a cylinder housing, a crankshaft which may be driven by the electric drive unit, and a piston, driven by the crankshaft and guided in the cylinder housing, which compresses the refrigerant
- the electric drive unit of each refrigerant compressor in the compressor family has a different height, composed of the height of the electric drive unit and the height of the cylinder housing (without height compensation elements), depending on the refrigerating capacity and the efficiency, it is provided that at least one height compensation element is situated between the electric drive unit and the cylinder housing of each refrigerant compressor.
- the distance between the lower edge of the section of the electric drive defining the height and the axis of the cylinder housing is set to be essentially identical for each compressor, and the overall height is kept constant, and it is possible for the electric drive unit to increase in size upwardly in the direction of the cylinder housing while at the same time the main bearing is situated as low as possible in the vicinity of the oil sump.
- the main bearing length may be dimensioned on the basis of the largest electric drive unit, thus minimizing the bearing load and the friction losses within a compressor family.
- the height of the section defining the electric drive is the height of the core stack of the stator.
- FIG. 1 shows a refrigerant compressor according to the prior art, in an isometric view
- FIG. 2 shows a refrigerant compressor according to the prior art, in a sectional view
- FIG. 3 shows a refrigerant compressor having a high refrigerating capacity and a large drive unit according to the prior art
- FIG. 4 shows a refrigerant compressor having a lower refrigerating capacity and a small drive unit according to the prior art
- FIG. 5 shows a schematic view of a refrigerant compressor according to the prior art, corresponding to FIG. 3 ;
- FIG. 6 shows a schematic view of a refrigerant compressor according to the prior art, corresponding to FIG. 4 ;
- FIG. 7 shows a crankshaft in detail
- FIG. 8 shows a schematic view of a refrigerant compressor according to the invention having a small drive unit
- FIG. 9 shows a schematic view of a refrigerant compressor according to the invention having a larger drive unit
- FIG. 10 shows an isometric view of a refrigerant compressor according to the invention
- FIG. 11 shows an isometric view of a height compensation element according to the invention
- FIG. 12 shows an isometric view of a height compensation element according to the invention
- FIG. 13 shows a detailed sectional view of a height compensation element according to the invention.
- FIG. 14 shows an isometric view of an alternative design variant of a height compensation element according to the invention.
- FIG. 1 shows a refrigerant compressor according to the prior art in an isometric illustration, comprising a cylinder housing 1 and an electric drive unit, of which the core stack 2 and the winding heads 3 a , 3 b are schematically shown in FIG. 1 , and height compensation elements, of which the coil spring elements 4 are visible, which are also used for elastic bearing of the refrigerant compressor.
- the outer housing is not shown in FIG. 1 .
- the cylinder housing 1 has multiple contact flanges 5 which extend in the direction of the crankshaft axis 6 and stand on the core stack 2 .
- the cylinder housing 1 and the core stack 2 are fixedly joined together by screws, not visible in FIG. 1 , which penetrate the core stack 2 from below and end in threaded boreholes present in the contact flanges 5 .
- FIG. 2 shows a sectional view of a refrigerant compressor according to FIG. 1 , together with the outer housing 10 which is composed of two hermetically sealed housing halves 10 a , 10 b which are joined together.
- FIG. 2 also shows the crankshaft 11 , which drives the piston 12 via a connecting rod 13 .
- the crankshaft is supported in a section of the cylinder housing 1 referred to as the main bearing 14 , and is mounted on a rotor 15 for the electric drive unit, preferably by means of a press fit.
- FIG. 2 Also shown in FIG. 2 is a connecting flange 16 , mounted on the outer housing 10 , for electrical lines, a suction muffler 17 provided on the cylinder head, and support feet 19 used for fixing the outer housing 10 to an external contact surface.
- FIG. 3 shows a sectional view of a refrigerant compressor according to the prior art, wherein the upper half 10 a of the outer housing has been omitted. Clearly shown are the boreholes 7 in the core stack 2 and in the contact flanges 5 , as well as the screws extending therein which are used for connecting the core stack 2 and the cylinder housing 1 .
- the overall height H 1 of the refrigerant compressor is composed of the height H z1 of the cylinder housing 1 , which extends from the lowest end of the contact flanges 5 to the piston axis 24 , and the height of the electric drive unit, which is specified by the height H e1 of the core stack 2 , for which reason the terms “core stack” and “electric drive unit” are used synonymously below.
- the outer housing 10 is matched to the refrigerant compressor in such a way that the upper housing half 10 a extends to just above the cylinder housing 1 , and in the region of the electrical connecting flange 16 extends downward in the direction thereof.
- the outer housing in a compressor family is always dimensioned according to the refrigerant compressor having the greatest power.
- the aim is to ensure that even refrigerant compressors having lower power, and therefore lower height, always occupy an essentially identical position within the outer housing 10 so that the connection of the electrical lines as well as the pressure and suction lines, and the positioning of the suction muffler, likewise do not have to be modified, and to prevent these smaller compressors inside the housing from tipping over or sliding out from the inner support due to vibration or acceleration during transport.
- height compensation elements are provided, for example in the form of support elements 8 and 9 , which are surrounded by a coil spring element 4 situated beneath the electric drive unit 2 , for example on the underside of the core stack 2 , and on which the refrigerant compressor is supported.
- the height of a height compensation element is thus composed of the overall height of the support elements 8 , 9 which results under load from the refrigerant compressor, together with the surrounding coil spring element 4 .
- FIG. 4 shows a refrigerant compressor of the same design as in FIG. 3 according to the prior art, but with a lower refrigerating capacity. This is identifiable on the one hand by the lower height H e2 of the core stack 2 , and on the other hand by the lower height H z2 of the cylinder housing 1 due to the different borehole diameter, and thus a lower overall height H 2 .
- height compensation elements composed of the support elements 8 , 9 and the coil spring elements 4 , having the same design as described in FIG. 3 , are provided, but with the difference that they have a greater height H h2 than height H h1 of components 4 , 8 , 9 which form the height compensation elements in FIG. 3 .
- FIG. 5 shows a purely schematic view of a refrigerant compressor according to the prior art corresponding to FIG. 3 , having the largest electric drive unit 2 of a compressor family, and FIG. 6 , having the smallest electric drive unit 2 of the same compressor family. It is immediately apparent that in both cases the main bearing length H L and the bearing width B L are identical, so that the larger electric drive unit 2 in FIG. 5 reduces the distance between the compressor and the oil sump 19 due to the fact that the overall height H overall of the refrigerant compressor is limited by the height of the outer housing.
- the main bearing length H L of this compressor could be increased, thereby reducing the bearing load, or the bearing load could be kept the same while reducing the friction losses.
- the press fit length P L of the mounting for the rotor 15 on the crankshaft 11 would be smaller in this case, but would still be adequately dimensioned; in other words, the press fit length P L in FIG. 5 is unnecessarily large, and it would be advantageous to increase the main bearing length H L in order to reduce the bearing forces and achieve smaller friction losses.
- the oil conveying height H oil (not including the submersion depth E t ) relative to the lower main bearing 18 is therefore unnecessarily high in known refrigerant compressors in order to provide space for the largest electric drive unit 2 in a compressor family, although as shown in FIG. 6 , the lower main bearing 18 could in fact be situated closer to the oil sump 19 .
- FIG. 7 shows a crankshaft in detail, with a lower main bearing 18 and an upper main bearing 20 , in addition to the oil inlet borehole 21 which is continuously immersed in the oil sump 19 and conveys the oil to the lower main bearing 18 , from which location it is conveyed via an oil conveying spindle 22 to the upper main bearing 20 , and from there to the oil outlet 23 .
- the oil is conveyed between the oil entry borehole 21 and the lower main bearing 18 via an eccentric borehole within the crankshaft 11 , wherein the delivery height, i.e., the distance between the oil inlet borehole 21 and the main bearing 18 , is limited and depends, among other factors, on the diameter of the crankshaft 11 .
- FIG. 8 shows in a purely schematic manner a refrigerant compressor according to the invention, which differs from the refrigerant compressors according to the prior art shown in FIGS. 5 and 6 by the fact that at least one height compensation element 26 according to the invention is situated between the cylinder housing 1 and the electric drive unit 2 , and the compressor bearing elements 25 for every refrigerant compressor in the same compressor family are always identical with respect to their height H h3 , so that the distance between the lower surface of the stator stack 2 relative to the base of the outer housing 10 is always the same.
- FIG. 8 shows, strictly by way of example, a refrigerant compressor having the smallest electric drive unit 2 in a compressor family.
- the height compensation elements 26 are provided to keep the overall height H overall essentially constant for every refrigerant compressor in this compressor family.
- such a refrigerant compressor according to the invention may be increased in size only upwardly; i.e., a larger electric drive unit 2 does not reduce the distance between the lower surface of the stator stack 2 and the base of the outer housing 10 .
- FIG. 9 likewise shows in a purely schematic manner such a refrigerant compressor having the largest electric drive unit in a compressor family.
- height compensation elements 26 are not provided, since the larger electric drive unit 2 has spanned this distance and is increased in size in the upward direction.
- the lower main bearing 18 may therefore be situated as low as possible in the outer housing 11 , since it is necessary to ensure only that the compressor does not brush against the housing wall 10 during operation, in particular during start-up.
- the main bearing length H L may be dimensioned on the basis of the largest electric drive unit 2 , as illustrated in FIG. 9 , since the press fit length P L is always the same, regardless of the size of the electric drive unit 2 .
- the bearing load of each compressor in a compressor family may be reduced.
- FIG. 10 shows an isometric view of a refrigerant compressor according to the invention together with height compensation elements 26 , a detailed view of which is shown by way of example in FIG. 11 .
- the height compensation element 26 illustrated as an example in FIG. 11 may have a different shape, and in the shape illustrated represents only one of many possible embodiments.
- An alternative embodiment is shown in FIG. 12 or FIG. 14 , for example.
- FIG. 13 shows a sectional view of a height compensation element 26 according to the invention in the installed position.
- FIG. 14 shows an isometric view of an alternative design variant of a height compensation element 26 according to the invention, without a borehole but with a recess for accommodating the connecting screw.
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Abstract
Description
- The present invention relates to a refrigerant compressor comprising an electric drive unit, a cylinder housing, a crankshaft which may be driven by the electric drive unit, and a piston, driven by the crankshaft and guided in the cylinder housing, which compresses the refrigerant.
- The present invention further relates to a family of refrigerant compressors of different refrigerating capacities, each refrigerant compressor comprising an electric drive unit, a cylinder housing, a crankshaft which may be driven by the electric drive unit, and a piston, driven by the crankshaft and guided in the cylinder housing, which compresses the refrigerant, wherein the electric drive unit of each refrigerant compressor in the family has a different height, depending on the refrigerating capacity.
- Such refrigerant compressors are well known, and are used primarily in household applications such as refrigerators or freezers, for example. Refrigerant compressors are situated in a hermetically sealed outer housing, and are part of a refrigerant circuit in which the refrigerant compressor compresses a gaseous refrigerant which is supplied from an evaporator to the piston/cylinder unit. The pressure and temperature increase during the compression. As a result, the refrigerant is converted to the liquid state in a condenser and is ultimately supplied by an expansion valve to the evaporator, where it is re-evaporated. The heat of vaporization necessary for this purpose is withdrawn from the surroundings, i.e., a cooling chamber, which is thereby cooled. Lastly, the gaseous refrigerant is supplied once again from the evaporator to the piston/cylinder unit and goes through a new compression and expansion cycle.
- Depending on the requirements, such refrigerant compressors are offered with different refrigerating capacities. The component which essentially determines the refrigerating capacity of a refrigerant compressor is the electric drive used. The greater the refrigerating capacity, the greater the height of the electric drive used. However, the displacement and thus the piston size vary as well as the stroke itself, and therefore contribute to differing refrigerating capacities.
- The overall height of a refrigerant compressor is essentially determined by the height of the electric drive unit and the height of the cylinder housing mounted on the electric drive unit. Whereas the height of the cylinder housing is generally kept constant and only the cylinder diameter and the cylinder stroke vary slightly as a function of the refrigerating capacity, the height of the electric drive unit varies greatly as a function of the refrigerating capacity. The electric drive unit is generally a single phase asynchronous motor composed of a rotor and a stator together with winding stacks, the stator being designed as a core stack which greatly influences the height of the electric drive unit, as described in greater detail below.
- The refrigerant compressor itself is situated in a hermetically sealed outer housing having an entering suction line which conducts the refrigerant to the cylinder, and an exiting pressure line which delivers the compressed refrigerant to the condenser. Also located on the hermetically sealed housing is a connecting flange for electrical lines for supplying the drive unit inside with power.
- An oil sump for lubricating the moving parts of the refrigerant compressor is situated at the base of an operation-ready outer housing. Oil is conveyed to the lubrication points as a result of the rotation of the crankshaft itself, which for this purpose has two sections provided with different oil conveying means (oil conveying spindle, eccentric borehole).
- A number of refrigerant compressors having numerous identical components is referred to as a “compressor family.” The individual members of a compressor family differ from one another by virtue of the refrigerating capacity and/or the efficiency, and, primarily as the result of the electric drive unit used, outer housing, crankshaft, cylinder housing, etc., are thus identical or practically identical (exceptions: cylinder bore diameter, stroke, and various installation recesses) to allow economical production.
- Thus, for known refrigerant compressors having different refrigerating capacities, within a compressor family the differing heights of the electric drive units would result in a respectively different overall height of each individual refrigerant compressor. As a result, for small electric drive units the cylinder housing provided on the electric drive unit would be situated lower in the outer housing, with the risk that the overall height would be so greatly reduced that the refrigerant compressor could tip over or at least tilt in the outer housing, which in turn would require the outer housing to be correspondingly reduced in size, which is unacceptable for the economic reasons mentioned.
- Therefore, it is known from the prior art to provide height compensation elements which balance out the differing heights of the electric drive units of refrigerant compressors in a compressor family in order to keep the overall height of the individual refrigerant compressors constant and to always allow use of the same outer housing.
- These known height compensation elements are generally support elements together with springs mounted on the underside of the core stack which have different heights, depending on the height of the core stack. The smaller the electric drive unit that is used, the greater the overall height of the height compensation elements must be to keep the overall height of the refrigerant compressor essentially constant, wherein the height of springs as well as support elements may be varied to change the overall height of the height compensation elements.
- Besides maintaining the overall height of the refrigerant compressors within a compressor family, the height compensation elements also allow identical crankshafts to be used in every case for each member of a compressor family, due to the fact that the height compensation elements consistently keep the cylinder housing, which has the main bearing for the crankshaft, at the same distance from the base of the outer housing, regardless of the height of the electric drive unit situated between the cylinder housing and the base of the outer housing. In this manner crankshafts of the same length may be used in all cases. Without the height compensation, due to the smaller distance between the cylinder housing and the base of the outer housing it would also be necessary to use shorter crankshafts for refrigerant compressors having smaller electric drive units.
- Under these constraints, in the dimensioning of a refrigerant compressor it is always the objective to dimension the main bearing length in such a way that it has the greatest length possible in order to minimize the bearing load. The same as for the overall crankshaft, it is also true for the main bearing length that for economic reasons, within a compressor family the same main bearing length is provided so that the main bearing for any crankshaft in a compressor family may be machined in the same manner.
- However, for known refrigerant compressors or compressor families having height compensation elements situated beneath the electric drive unit it has proven to be disadvantageous that, because the electric drive unit can increase in size only downward in the direction of the base of the outer housing, there are limitations in dimensioning the main bearing length, and for the respective largest compressor in a compressor family, although a larger main bearing length might be theoretically possible, for a compressor of the compressor family having a smaller electric drive unit this would not leave enough space on the crankshaft for the shrink fit between the crankshaft and the rotor.
- Thus, although it is desirable and for larger electric drive units is also possible in principle, the main bearing cannot be further lengthened, and therefore the bearing load cannot be further reduced.
- At the same time, since known refrigerant compressors in a compressor family are able to increase in size only in the downward direction, in order to accommodate the larger electric drive unit between the main bearing of the crankshaft and the oil sump the main bearing, in particular the lower main bearing, must also be situated at a sufficient height within the housing. The section of the crankshaft located beneath the lower main bearing must therefore be long enough to still be able to submerge into the oil sump at the base of the outer housing in order to convey the oil to the lubrication points.
- However, in this lower section of the crankshaft oil is conveyed by means of an eccentric borehole in the crankshaft, in which the oil moves from the oil sump in the direction of the bearing section as a result of the rotation of the crankshaft. However, the conveying capacity of the eccentric borehole decreases with increasing length of the eccentric borehole, so that in this case for particularly large and therefore high electric drive units, this may result in impairment of the oil supply to the bearing section of the crankshaft and to the connecting rod and piston.
- The object of the present invention, therefore, is to avoid these disadvantages and provide a refrigerant compressor of the type mentioned at the outset which, regardless of the height of the electric drive unit used, ensures a stable oil supply to the moving parts by always keeping the pump height as low as possible relative to the bearing section of the crankshaft.
- A further aim of the present invention is to provide a compressor family of the type mentioned at the outset in which for each family member, regardless of the refrigerating capacity, the greatest possible main bearing length may be provided, based on the largest electric drive unit used.
- A further aim of the present invention is to provide a refrigerant compressor of the type mentioned at the outset which, regardless of the height of the electric drive unit used, always has an essentially constant height.
- This is achieved according to the invention by the characterizing features of
claim 1. - For a refrigerant compressor having an electric drive unit, a cylinder housing, a crankshaft which may be driven by the electric drive unit, and a piston, driven by the crankshaft and guided in the cylinder housing, which compresses the refrigerant, it is provided that at least one height compensation element is situated between the cylinder housing and the electric drive unit. This allows the electric drive unit to be increased in size upwardly in the direction of the cylinder housing while at the same time the main bearing is situated as low as possible in the vicinity of the oil sump. In this case the main bearing length may be dimensioned on the basis of the largest electric drive unit, thus minimizing the bearing load and the losses from friction within a compressor family.
- According to one preferred design variant of the invention, the cylinder housing has at least one contact flange which is mounted on at least one corresponding contact surface of the electric drive unit, and the at least one height compensation element is situated between the contact flange and the contact surface.
- According to a further preferred design variant of the invention the electric drive unit is a single phase asynchronous motor, and the contact surface is the core stack of the stator of the single phase asynchronous motor.
- The contact flange, contact surface, and height compensation element are preferably connected to one another by a screw connection which is preferably guided in a borehole or another type of recess in the height compensation element.
- The object of the present invention is further achieved by the characterizing features of
Claim 6, in which for a compressor family wherein each refrigerant compressor in the compressor family includes an electric drive unit, a cylinder housing, a crankshaft which may be driven by the electric drive unit, and a piston, driven by the crankshaft and guided in the cylinder housing, which compresses the refrigerant, and wherein the electric drive unit of each refrigerant compressor in the compressor family has a different height, composed of the height of the electric drive unit and the height of the cylinder housing (without height compensation elements), depending on the refrigerating capacity and the efficiency, it is provided that at least one height compensation element is situated between the electric drive unit and the cylinder housing of each refrigerant compressor. In this manner the distance between the lower edge of the section of the electric drive defining the height and the axis of the cylinder housing is set to be essentially identical for each compressor, and the overall height is kept constant, and it is possible for the electric drive unit to increase in size upwardly in the direction of the cylinder housing while at the same time the main bearing is situated as low as possible in the vicinity of the oil sump. In this case the main bearing length may be dimensioned on the basis of the largest electric drive unit, thus minimizing the bearing load and the friction losses within a compressor family. - In one preferred design variant of the invention the height of the section defining the electric drive is the height of the core stack of the stator.
- The invention is described in detail with reference to exemplary embodiments. The drawings show the following:
-
FIG. 1 shows a refrigerant compressor according to the prior art, in an isometric view; -
FIG. 2 shows a refrigerant compressor according to the prior art, in a sectional view; -
FIG. 3 shows a refrigerant compressor having a high refrigerating capacity and a large drive unit according to the prior art; -
FIG. 4 shows a refrigerant compressor having a lower refrigerating capacity and a small drive unit according to the prior art; -
FIG. 5 shows a schematic view of a refrigerant compressor according to the prior art, corresponding toFIG. 3 ; -
FIG. 6 shows a schematic view of a refrigerant compressor according to the prior art, corresponding toFIG. 4 ; -
FIG. 7 shows a crankshaft in detail; -
FIG. 8 shows a schematic view of a refrigerant compressor according to the invention having a small drive unit; -
FIG. 9 shows a schematic view of a refrigerant compressor according to the invention having a larger drive unit; -
FIG. 10 shows an isometric view of a refrigerant compressor according to the invention; -
FIG. 11 shows an isometric view of a height compensation element according to the invention; -
FIG. 12 shows an isometric view of a height compensation element according to the invention; -
FIG. 13 shows a detailed sectional view of a height compensation element according to the invention; and -
FIG. 14 shows an isometric view of an alternative design variant of a height compensation element according to the invention. -
FIG. 1 shows a refrigerant compressor according to the prior art in an isometric illustration, comprising acylinder housing 1 and an electric drive unit, of which thecore stack 2 and the windingheads FIG. 1 , and height compensation elements, of which thecoil spring elements 4 are visible, which are also used for elastic bearing of the refrigerant compressor. For the sake of clarity the outer housing is not shown inFIG. 1 . - The
cylinder housing 1 hasmultiple contact flanges 5 which extend in the direction of thecrankshaft axis 6 and stand on thecore stack 2. Thecylinder housing 1 and thecore stack 2 are fixedly joined together by screws, not visible inFIG. 1 , which penetrate thecore stack 2 from below and end in threaded boreholes present in thecontact flanges 5. -
FIG. 2 shows a sectional view of a refrigerant compressor according toFIG. 1 , together with the outer housing 10 which is composed of two hermetically sealedhousing halves FIG. 2 also shows thecrankshaft 11, which drives thepiston 12 via a connectingrod 13. The crankshaft is supported in a section of thecylinder housing 1 referred to as themain bearing 14, and is mounted on arotor 15 for the electric drive unit, preferably by means of a press fit. - Also shown in
FIG. 2 is a connectingflange 16, mounted on the outer housing 10, for electrical lines, asuction muffler 17 provided on the cylinder head, andsupport feet 19 used for fixing the outer housing 10 to an external contact surface. -
FIG. 3 shows a sectional view of a refrigerant compressor according to the prior art, wherein theupper half 10 a of the outer housing has been omitted. Clearly shown are theboreholes 7 in thecore stack 2 and in thecontact flanges 5, as well as the screws extending therein which are used for connecting thecore stack 2 and thecylinder housing 1. - It is immediately apparent that the overall height H1 of the refrigerant compressor is composed of the height Hz1 of the
cylinder housing 1, which extends from the lowest end of thecontact flanges 5 to thepiston axis 24, and the height of the electric drive unit, which is specified by the height He1 of thecore stack 2, for which reason the terms “core stack” and “electric drive unit” are used synonymously below. - As shown in particular in
FIG. 2 , the outer housing 10 is matched to the refrigerant compressor in such a way that theupper housing half 10 a extends to just above thecylinder housing 1, and in the region of the electrical connectingflange 16 extends downward in the direction thereof. To avoid having to produce different outer housings 10 for refrigerant compressors of differing refrigerating capacities in a compressor family, the outer housing in a compressor family is always dimensioned according to the refrigerant compressor having the greatest power. - The aim is to ensure that even refrigerant compressors having lower power, and therefore lower height, always occupy an essentially identical position within the outer housing 10 so that the connection of the electrical lines as well as the pressure and suction lines, and the positioning of the suction muffler, likewise do not have to be modified, and to prevent these smaller compressors inside the housing from tipping over or sliding out from the inner support due to vibration or acceleration during transport.
- For this purpose height compensation elements are provided, for example in the form of
support elements coil spring element 4 situated beneath theelectric drive unit 2, for example on the underside of thecore stack 2, and on which the refrigerant compressor is supported. - The height of a height compensation element is thus composed of the overall height of the
support elements coil spring element 4. -
FIG. 4 shows a refrigerant compressor of the same design as inFIG. 3 according to the prior art, but with a lower refrigerating capacity. This is identifiable on the one hand by the lower height He2 of thecore stack 2, and on the other hand by the lower height Hz2 of thecylinder housing 1 due to the different borehole diameter, and thus a lower overall height H2. To keep the position of thepiston axis 24 within the outer housing 10 the same as that of the refrigerant compressor illustrated inFIG. 3 , height compensation elements composed of thesupport elements coil spring elements 4, having the same design as described inFIG. 3 , are provided, but with the difference that they have a greater height Hh2 than height Hh1 ofcomponents FIG. 3 . -
FIG. 5 shows a purely schematic view of a refrigerant compressor according to the prior art corresponding toFIG. 3 , having the largestelectric drive unit 2 of a compressor family, andFIG. 6 , having the smallestelectric drive unit 2 of the same compressor family. It is immediately apparent that in both cases the main bearing length HL and the bearing width BL are identical, so that the largerelectric drive unit 2 inFIG. 5 reduces the distance between the compressor and theoil sump 19 due to the fact that the overall height Hoverall of the refrigerant compressor is limited by the height of the outer housing. - As likewise shown in
FIG. 5 , the main bearing length HL of this compressor could be increased, thereby reducing the bearing load, or the bearing load could be kept the same while reducing the friction losses. The press fit length PL of the mounting for therotor 15 on thecrankshaft 11 would be smaller in this case, but would still be adequately dimensioned; in other words, the press fit length PL inFIG. 5 is unnecessarily large, and it would be advantageous to increase the main bearing length HL in order to reduce the bearing forces and achieve smaller friction losses. - However, if the main bearing length HL were increased, for smaller compressors in the same compressor family as shown in
FIG. 6 the necessary smallest possible press fit length PLmin could not be maintained. - The oil conveying height Hoil (not including the submersion depth Et) relative to the lower
main bearing 18 is therefore unnecessarily high in known refrigerant compressors in order to provide space for the largestelectric drive unit 2 in a compressor family, although as shown inFIG. 6 , the lowermain bearing 18 could in fact be situated closer to theoil sump 19. - For better understanding
FIG. 7 shows a crankshaft in detail, with a lowermain bearing 18 and an uppermain bearing 20, in addition to theoil inlet borehole 21 which is continuously immersed in theoil sump 19 and conveys the oil to the lowermain bearing 18, from which location it is conveyed via anoil conveying spindle 22 to the uppermain bearing 20, and from there to theoil outlet 23. - As previously mentioned, the oil is conveyed between the
oil entry borehole 21 and the lowermain bearing 18 via an eccentric borehole within thecrankshaft 11, wherein the delivery height, i.e., the distance between theoil inlet borehole 21 and themain bearing 18, is limited and depends, among other factors, on the diameter of thecrankshaft 11. -
FIG. 8 shows in a purely schematic manner a refrigerant compressor according to the invention, which differs from the refrigerant compressors according to the prior art shown inFIGS. 5 and 6 by the fact that at least oneheight compensation element 26 according to the invention is situated between thecylinder housing 1 and theelectric drive unit 2, and thecompressor bearing elements 25 for every refrigerant compressor in the same compressor family are always identical with respect to their height Hh3, so that the distance between the lower surface of thestator stack 2 relative to the base of the outer housing 10 is always the same. -
FIG. 8 shows, strictly by way of example, a refrigerant compressor having the smallestelectric drive unit 2 in a compressor family. Theheight compensation elements 26 are provided to keep the overall height Hoverall essentially constant for every refrigerant compressor in this compressor family. - Due to the configuration of the
height compensation elements 26, such a refrigerant compressor according to the invention may be increased in size only upwardly; i.e., a largerelectric drive unit 2 does not reduce the distance between the lower surface of thestator stack 2 and the base of the outer housing 10. -
FIG. 9 likewise shows in a purely schematic manner such a refrigerant compressor having the largest electric drive unit in a compressor family. In this caseheight compensation elements 26 are not provided, since the largerelectric drive unit 2 has spanned this distance and is increased in size in the upward direction. - The lower
main bearing 18 may therefore be situated as low as possible in theouter housing 11, since it is necessary to ensure only that the compressor does not brush against the housing wall 10 during operation, in particular during start-up. - At the same time, the main bearing length HL may be dimensioned on the basis of the largest
electric drive unit 2, as illustrated inFIG. 9 , since the press fit length PL is always the same, regardless of the size of theelectric drive unit 2. Thus, in contrast to the prior art the bearing load of each compressor in a compressor family may be reduced. -
FIG. 10 shows an isometric view of a refrigerant compressor according to the invention together withheight compensation elements 26, a detailed view of which is shown by way of example inFIG. 11 . Based on the above discussion, theheight compensation element 26 illustrated as an example inFIG. 11 may have a different shape, and in the shape illustrated represents only one of many possible embodiments. An alternative embodiment is shown inFIG. 12 orFIG. 14 , for example. -
FIG. 13 shows a sectional view of aheight compensation element 26 according to the invention in the installed position. -
FIG. 14 shows an isometric view of an alternative design variant of aheight compensation element 26 according to the invention, without a borehole but with a recess for accommodating the connecting screw. - The dimensions and proportions of the individual components relative to one another are illustrated in a purely schematic manner.
-
-
- 1 Cylinder housing
- 2 Core stack of the electric drive unit
- 3 Winding head
- 4 Coil spring element
- 5 Contact flange
- 6 Crankshaft axis
- 7 Borehole in the core stack
- 8 Support element
- 9 Support element
- 10 Outer housing
- 11 Crankshaft
- 12 Piston
- 13 Connecting rod
- 14 Main bearing
- 15 Rotor
- 16 Connecting flange for electrical lines
- 17 Suction muffler
- 18 Lower main bearing
- 19 Oil sump
- 20 Upper main bearing
- 21 Oil pump inlet borehole
- 22 Oil conveying spindle
- 23 Oil outlet
- 24 Piston axis
- 25 Compressor bearing element
- 26 Height compensation element according to the invention
Claims (7)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0051507U AT10065U1 (en) | 2007-08-28 | 2007-08-28 | REFRIGERANT COMPRESSOR |
ATGM515/2007 | 2007-08-28 | ||
PCT/EP2008/058259 WO2009030536A1 (en) | 2007-08-28 | 2008-06-27 | Coolant compressor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110217189A1 true US20110217189A1 (en) | 2011-09-08 |
Family
ID=39494819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/733,384 Abandoned US20110217189A1 (en) | 2007-08-28 | 2008-06-27 | Refrigerant compressor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110217189A1 (en) |
EP (1) | EP2185819B1 (en) |
CN (1) | CN101828036B (en) |
AT (1) | AT10065U1 (en) |
WO (1) | WO2009030536A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140070469A1 (en) * | 2011-03-18 | 2014-03-13 | Whirlpool S.A. | Suspension spring for a refrigeration compressor |
US20160201661A1 (en) * | 2013-09-03 | 2016-07-14 | Panasonic Intellectual Property Management Co., Ltd. | Sealed compressor and freezer device or refrigerator equipped with same |
WO2017137328A1 (en) * | 2016-02-09 | 2017-08-17 | Arcelik Anonim Sirketi | A compressor that is operated in a silent manner |
CN113864156A (en) * | 2021-10-28 | 2021-12-31 | 珠海格力电器股份有限公司 | Reciprocating compressor |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103038583B (en) * | 2010-06-08 | 2015-05-13 | 阿塞里克股份有限公司 | Hermetic compressor |
WO2011154428A2 (en) | 2010-06-08 | 2011-12-15 | Arcelik Anonim Sirketi | A hermetic compressor |
CN113048037B (en) * | 2019-12-26 | 2024-01-05 | 安徽美芝制冷设备有限公司 | Compressor and refrigeration equipment |
CN113048038B (en) * | 2019-12-26 | 2023-09-19 | 安徽美芝制冷设备有限公司 | Compressor and refrigeration equipment |
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DD154396A1 (en) * | 1980-12-10 | 1982-03-17 | Eberhard Guenther | HERMETIC COATING COMPRESSOR |
IT221765Z2 (en) * | 1991-03-26 | 1994-10-20 | Whirlpool Italia | HERMETIC MOTOR-COMPRESSOR WITH BODY OR SUPPORT BRACKET OF THE PERFECTED ENGINE |
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AT8188U1 (en) * | 2004-11-02 | 2006-03-15 | Acc Austria Gmbh | REFRIGERANT COMPRESSOR |
CN1769674A (en) * | 2004-11-05 | 2006-05-10 | 乐金电子(天津)电器有限公司 | Multi-cylinder hermetic compressor |
-
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- 2007-08-28 AT AT0051507U patent/AT10065U1/en not_active IP Right Cessation
-
2008
- 2008-06-27 CN CN200880111935XA patent/CN101828036B/en not_active Expired - Fee Related
- 2008-06-27 WO PCT/EP2008/058259 patent/WO2009030536A1/en active Application Filing
- 2008-06-27 EP EP08774425.6A patent/EP2185819B1/en not_active Not-in-force
- 2008-06-27 US US12/733,384 patent/US20110217189A1/en not_active Abandoned
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US6409481B1 (en) * | 1998-01-28 | 2002-06-25 | Verdichter Oe. Ges,M.B.H. | Hermetically encapsulated compressor |
US6171076B1 (en) * | 1998-06-10 | 2001-01-09 | Tecumseh Products Company | Hermetic compressor assembly having a suction chamber and twin axially disposed discharge chambers |
US20030129067A1 (en) * | 2002-01-09 | 2003-07-10 | Silva Jose Mario | Hermetic compressor for a refrigeration system, for vehicular use |
US20040057850A1 (en) * | 2002-09-20 | 2004-03-25 | Tsutomu Nozaki | Hermetic type compressor |
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US20140070469A1 (en) * | 2011-03-18 | 2014-03-13 | Whirlpool S.A. | Suspension spring for a refrigeration compressor |
US20160201661A1 (en) * | 2013-09-03 | 2016-07-14 | Panasonic Intellectual Property Management Co., Ltd. | Sealed compressor and freezer device or refrigerator equipped with same |
US11236740B2 (en) * | 2013-09-03 | 2022-02-01 | Panasonic Appliances Refrigeration Devices Singapore | Sealed compressor and freezer device or refrigerator equipped with same |
WO2017137328A1 (en) * | 2016-02-09 | 2017-08-17 | Arcelik Anonim Sirketi | A compressor that is operated in a silent manner |
CN113864156A (en) * | 2021-10-28 | 2021-12-31 | 珠海格力电器股份有限公司 | Reciprocating compressor |
Also Published As
Publication number | Publication date |
---|---|
AT10065U1 (en) | 2008-08-15 |
EP2185819B1 (en) | 2016-12-07 |
CN101828036A (en) | 2010-09-08 |
CN101828036B (en) | 2013-07-03 |
EP2185819A1 (en) | 2010-05-19 |
WO2009030536A1 (en) | 2009-03-12 |
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