Temperature control for a centrifuge

Abstract

A centrifuge, in particular as a laboratory centrifuge, has a centrifuge container in which a centrifuge rotor can be accommodated, a centrifuge motor for driving the centrifuge rotor, and a housing with a base and lateral side walls. The centrifuge container, the centrifuge rotor and the centrifuge motor are accommodated in the housing. A temperature control device for controlling the temperature of the centrifuge rotor has air directing means which are adapted to suck in air into the centrifuge container in a lower region. Such temperature control of the centrifuge operates more effectively than before. At the same time, the cooling of heat-emitting centrifuge components, such as the centrifuge motor and electronic components, takes place. The temperature control also functions if a safety container is arranged around the centrifuge container.

Claims

1.-15. (canceled)

16. A centrifuge (10), comprising: a centrifuge container (30) in which a centrifuge rotor (28) is accommodated; a centrifuge motor (26) for driving the centrifuge rotor (28); a housing (12) with a base (20) and lateral side walls (16, 17, 18), the centrifuge container (30), the centrifuge rotor (28) and the centrifuge motor (26) being accommodated in the housing; and a temperature control device for controlling the temperature of the centrifuge rotor (28), wherein the temperature control device comprises air directing means (38), which are adapted to suck in supply air (160) into the centrifuge container (30) in a lower region (151, 152).

17. The centrifuge (10) according to claim 16, wherein the air directing means (38) are configured to suck in supply air (160) through the base (20) and/or at least one side wall of the centrifuge housing (12), wherein the supply air (160) is directed directly from the centrifuge housing (12) to the centrifuge container (30), without coming into contact with heat-emitting elements of the centrifuge, in particular the centrifuge motor (26) and/or electronic components (34, 36) of the centrifuge (10).

18. The centrifuge (10) according to claim 16, wherein the air directing means (38) are configured to discharge exhaust air (162) from the centrifuge container (30) out of the centrifuge housing (12) in such a way that re-entry of the exhaust air (162) into the centrifuge container (30) is prevented.

19. The centrifuge (10) according to claim 16, wherein the air directing means (38) are configured to guide exhaust air (162) from the centrifuge container (30) past the centrifuge motor (26) and/or past electronic components (34, 36) of the centrifuge (10), wherein the exhaust air (162) is guided first past the centrifuge motor (26) and then past electronic components (34, 36), and/or to guide exhaust air (162) from the centrifuge container (30) along an outer side of the centrifuge container (30, 164).

20. The centrifuge (10) according to claim 19, further comprising a safety container (32) at least partially enclosing the centrifuge container (30), wherein the air directing means (38) are configured to guide exhaust air (162) from the centrifuge container (30) between (166) the centrifuge container (30) and the safety container (32), and wherein the safety container (32) comprises one or more openings (144) for the supply air (160) in its base region (142).

21. The centrifuge (10) according to claim 16, wherein the air directing means (38) are embodied to be thermally insulated at least in some regions and/or that the centrifuge container (10) is provided with thermal insulation (44) on its outer side in the region of the air directing means (38) and/or the air directing means (38) are embodied as one or more foam molded parts (40, 44, 46) made of polypropylene or polyurethane, and/or at least one sound-insulating foam element (40, 44, 46) made of polyurethane is used for sound insulation.

22. The centrifuge (10) according to claim 20, wherein the air directing means (38) are embodied in several parts, consisting of a lower part (42) for supplying the supply air (160) to the centrifuge container (30) and for discharging the exhaust air (162) to the centrifuge motor (26) and/or to electronic components (34, 36), and an upper part (40) for discharging the exhaust air (162) from the centrifuge container (30) into a space (166) between the centrifuge container (30) and the safety container (32).

23. The centrifuge (10) according to claim 22, wherein the lower part (42) is formed of two horizontally separated pieces (44, 46), wherein one piece (46) of the two horizontally separated pieces is arranged between the base (20) of the housing (12) and the safety container (32) and another piece (44) of the two horizontally separated pieces is arranged between the safety container (32) and the centrifuge container (30).

24. The centrifuge (20) according to claim 16, wherein the air directing means (38) are adapted to guide the supply air (160) into the centrifuge container (30) in a direction of rotation (D) of the centrifuge rotor (28) and/or to introduce the supply air (160) into the centrifuge container (30) close to an axis of rotation (A), and/or wherein the air directing means (38) are adapted to extract the air moved in the centrifuge container (30) by the centrifuge rotor (28) at a rim (164) of the centrifuge container (30).

25. The centrifuge (10) according to claim 16, wherein the air directing means have a rough surface at least in some regions and/or wherein the air directing means have at least one selectively closable air guide.

26. The centrifuge (10) according to claim 20, wherein the air directing means (38) completely enclose the centrifuge motor (26) horizontally between the base (20) and the safety container (32) or centrifuge container (30), except for at least one exhaust air inlet (50) and at least one exhaust air outlet (62).

27. The centrifuge (10) according to claim 20, wherein the air directing means (38) are configured to perform at least one of the following functions: sucking in the supply air (160) through one or more supply air openings (158), which are arranged on the base (20) and/or near the base on at least one side wall of the centrifuge housing (12), guiding the supply air (160) into an interior of the centrifuge container (30) without coming into contact with heat-emitting elements of the centrifuge, in particular the centrifuge motor (26) and/or electronic components (34) of the centrifuge, wherein the supply air (160) is introduced into the centrifuge container (30) close to an axis of rotation (A) of the centrifuge rotor (289), removing the exhaust air (162) from the centrifuge container (30), wherein the exhaust air (162) is removed from the centrifuge container (30) far from the axis of rotation (A) of the centrifuge rotor (28), guiding of the exhaust air (162) behind an outer wall of the centrifuge container (30) in the direction of the base (20) of the centrifuge housing (12), wherein the exhaust air (162) is guided between the centrifuge container (30) and the safety container (32), guiding the exhaust air to the centrifuge motor (26) and to electrical components of the centrifuge, wherein the exhaust air is first guided to the centrifuge motor for its cooling and then to the electrical components of the centrifuge for their cooling, discharging the exhaust air out of the centrifuge housing into a surrounding area of the centrifuge.

28. A method for controlling the temperature of a centrifuge rotor (28) of a centrifuge (10), the centrifuge comprising a centrifuge container (30) in which a centrifuge rotor (28) is accommodated, a centrifuge motor (26) for driving the centrifuge rotor (28), a housing (12) having a base (20) and lateral side walls (16, 17, 18), wherein the centrifuge container (30), the centrifuge rotor (28) and the centrifuge motor (26), are accommodated in the housing, and a temperature control device for controlling the temperature of the centrifuge rotor (28), (12), wherein the method is characterized in that air directing means (38) are used to suck supply air (160) into the centrifuge container (30) in a lower region (151, 152).

29. The method according to claim 28, air (160) is introduced into the centrifuge container (30) close to an axis (A) and is removed from the centrifuge container (30) far (164) from the axis.

30. The method according to claim 28, wherein, when the centrifuge is started, the supply air is at least partially throttled, and/or wherein, when the centrifuge is stopped, the supply air to the centrifuge container is increased and/or wherein the temperature of the centrifuge rotor is adjusted by controlling an air flow through the centrifuge container.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0052] FIG. 1 shows a centrifuge in a perspective view.

[0053] FIG. 2 is a vertical sectional view of the centrifuge according to FIG. 1.

[0054] FIG. 3 shows the centrifuge according to FIG. 1 in a first horizontal sectional view x-x.

[0055] FIG. 4 shows the centrifuge according to FIG. 1 in a second horizontal sectional view y-y.

[0056] FIG. 5 shows the one piece of the lower part of the air directing means of the centrifuge according to FIG. 1 in a perspective view from above.

[0057] FIG. 6 shows the one piece according to FIG. 5 in a perspective view from below.

[0058] FIG. 7 shows the other piece of the lower part of the air directing means of the centrifuge according to FIG. 1 in a perspective view from above.

[0059] FIG. 8 shows the other piece according to FIG. 7 in a perspective view from below.

[0060] FIG. 9 shows the upper part of the air directing means of the centrifuge according to FIG. 1 in a perspective view from above.

[0061] FIG. 10 shows the upper part according to FIG. 9 in a perspective view from below.

[0062] FIG. 11 shows a view into the safety container of the centrifuge according to FIG. 1 in a perspective view from above in a partial illustration.

[0063] FIG. 12 is a view of the centrifuge container of the centrifuge according to FIG. 1 in a perspective view from above in a partial illustration.

DETAILED DESCRIPTION

[0064] FIGS. 1 to 12 show the centrifuge 10, along with its most important components, in numerous views.

[0065] The centrifuge is a laboratory centrifuge 10, which in accordance with FIG. 1 has a centrifuge housing 12 with a centrifuge lid 14, side walls 16, a rear wall 17, a front 18 and a base 20. A control unit 22 is integrated into the front 18 in the usual manner. The side walls 16 and also the rear wall 17 have ventilation openings (not shown), in the form of slots, through which air can pass into and out of the centrifuge housing 12.

[0066] FIGS. 2 to 4 show that the laboratory centrifuge 10 has a centrifuge motor 26, which, when correspondingly controlled, drives a removable centrifuge rotor 28. Sample receptacles for sample vessels (both not shown) are arranged in the centrifuge rotor 28 in the usual manner. Samples accommodated in the sample vessels can then be centrifuged.

[0067] The centrifuge rotor 28 runs in a centrifuge container 30 made of stainless steel, which is surrounded by a safety container 32 that prevents rotor components from escaping outside the centrifuge housing 12 in the event of a crash. This safety container 32 is designed to be suitably reinforced. The centrifuge container 30 is shown in more detail in FIG. 11 and the safety container 32 is shown in more detail in FIG. 12.

[0068] The laboratory centrifuge 10 has electronic components 34 for operating and controlling and regulating the laboratory centrifuge 10, as is particularly apparent from FIG. 3. For improved heat dissipation, a cooling fin element 36 is provided, the cooling fins (not shown) of which extend horizontally.

[0069] In addition, air directing means 38 are arranged in the laboratory centrifuge 10, which are shown in more detail in FIGS. 5 to 10. Such air directing means 38 are formed by an upper part 40 and a lower part 42, wherein the lower part 42 is in turn subdivided into a piece 44 and another piece 46.

[0070] According to FIGS. 5 and 6, one piece 44 of the lower part 42 of the air directing means 38 has a roughly bowl-shaped configuration, which opens upward with a raised rim 48. Two laterally opposed recesses 50 are provided in the rim 48.

[0071] A central aperture 54 is designed to encompass the centrifuge motor 26 and is located in the center of one piece 44.

[0072] Further, the one piece 44 has four first connecting pieces 56 and two second connecting pieces 58. Each of the connecting pieces has feedthroughs 60, 62 through the one piece 44. The feedthroughs 62 through the second connecting pieces 58 thereby correspond to the respective recess 50. Circumferential projections 64, 66 in the form of fins, which define between them a first connecting region 67, are located inside and outside with respect to the connecting pieces 56, 58.

[0073] FIG. 3 and FIG. 5 show that the feedthroughs 60 extend parallel to the direction of rotation D of the centrifuge rotor 28 in a spiral shape in the direction of the axis of rotation A.

[0074] According to FIGS. 7 and 8, the other piece 46 of the lower part 42 of the air directing means 38 has a generally tire-shaped configuration with a central recess 68, which is designed for the spaced horizontal enclosure of the centrifuge motor 26.

[0075] The other piece 46 has a partial circumferential rim 70 and interior second connecting regions 72, 74, which have four first depressions 76 and two second depressions 78 with corresponding feedthroughs 80, 82 corresponding to the connecting pieces 56, 58. Such second connecting regions 72, 74 are in turn surrounded by circumferential projections 84, 86 in the form of fins, wherein, further, a connecting projection 88 in the form of a fin is arranged between the circumferential projections 84, 86 and a joining projection 90 is arranged in the form of a fin on the projection 86.

[0076] The central recess 68 corresponds with an exhaust air inlet 92 and an exhaust air outlet 94 and has three fillets 96, which are designed for the spaced enclosure of corresponding fastening elements 98 of the centrifuge motor 26 in the housing base 20 (see FIG. 3).

[0077] A curved wedge 100 is located in the exhaust air inlet 92, which brings together the two feedthroughs 82 of the two second depressions 78 and directs them in the direction of the central recess 68 and the exhaust air outlet 96. The feedthroughs 82, are exactly opposite each other in the second depressions 78 with respect to the axis of rotation A of the centrifuge rotor 28, thus each describe a 90° curve under the second connecting region 72, 74 and the rim 70. As shown in FIG. 3, coming from the depressions 78 they first pass radially outward into the rim 70 and then circulate in such rim 70 until they reach the wedge 100 and the exhaust air inlet 92.

[0078] The two feedthroughs 82 are surrounded by a common projection 102 in the form of a fin. The four feedthroughs 80 open into two oppositely arranged third connecting regions 104, 106 with corresponding supply air ports 108, which are also embodied as projections. The connecting regions 104, 106 are in turn surrounded by circumferential projections 110, 112. Thereby, the circumferential projections 110, 112 and 102 are embodied to be partially overlapping. There is also a connecting projection 114.

[0079] According to FIG. 5, the one piece 44 of the lower part 42 of the air directing means 38 also has connecting projections 116, 118 in the form of fins, which surround the feedthroughs 60, 62 in some regions, wherein ports 120, 122 are recessed in each case. In addition, connecting projections 124, 126, 128 are provided in the form of fins.

[0080] FIGS. 9 and 10 show that the upper part 40 of the air directing means 38 is embodied to be hoop-like, wherein the hoop has an internal circumferential collar 130. Additionally, moldings 132, 134, 136 exist to secure and align the upper part 40 with respect to the safety container 32 and the upper part 138 of the housing 12. The axial projection 140, which is embodied as a continuous fin, is used to seal against the safety container 32.

[0081] FIG. 11 shows that the safety container 32 has apertures 144, 146 in its base 142 for connection to the feedthroughs 80, 82 of the other piece 46 of the lower part 42 of the air directing means 38, boreholes 148 for attaching the safety container 32 to the base 20 of the housing 12 and a central opening 150 for accommodating the centrifuge motor 26.

[0082] Due to the circumferential projections 84, 86 along with the connecting projection 88 and the joining projection 90, the second connecting regions 72, 74 do not directly abut the safety container 32; rather, a tolerance compensation is effected, by which the accuracy of fit is improved when connecting the safety container 32 and the other piece 46 of the lower part 42, since the projections 84, 86, 88, 90 can be pressed very easily.

[0083] Finally, FIG. 12 shows that the centrifuge container 30, which is inserted in the one piece 44 of the lower part 42, has a base 151, which is only partially shown in FIG. 12 (and, in fact, with an annular recess, which is actually not present, in order to illustrate the air directing paths) (see FIG. 2). Below the base 151 is a sleeve 152 around the centrifuge motor 26 (see FIGS. 2 and 4), which is fixed in the one piece 44 with its outer circumference (see FIG. 2), thereby acting as a seal and forming, together with the base 151 of the centrifuge container 30, an air directing space 153, which communicates with the four ports 120.

[0084] Here as well, a very good fit and at the same time a sealing of the feedthroughs 60 and the ports 120 results from the projections 116, 118, 126, 128, which are pressable (compressible) and compensate for tolerances.

[0085] In the assembled state according to FIG. 2, the centrifuge container 30 with the one piece 44 of the lower part 42 is inserted in the safety container 32 according to FIG. 11.

[0086] The apertures 144, 146 of the safety container 32 align in cross-section with the respective cross-sections of the depressions 76, 78, such that the connecting pieces 56, 58 can fit snugly into the depressions 76, 78, in order to thereby connect the feedthroughs 60, 62 to the feedthroughs 80, 82 in a sealed manner. As a result, no supply or exhaust air can escape in the connecting region between the other piece 46, the safety container 32 and a piece 44; rather, it is directed entirely through the formed air directing channels 154, 156.

[0087] Due to the fact that the other piece 46 of the lower part 42 has projections 102, 110, 112, 114, the other piece 46 again does not lie fully against the base 20 of the housing, thus ensuring tolerance compensation.

[0088] The supply air ports 108, in the assembled stated corresponding to FIG. 2, engage directly with corresponding apertures 158 in the base 20 of the housing 12, resulting in an overall closed air guide 160, 162 of supply air 160 and exhaust air 162.

[0089] More specifically, the supply air 160 is sucked in through the four apertures 158 located in the base 20 and transferred to the supply air ports 108 and the feedthroughs 80. From there, the supply air is transferred to the connecting pieces 56 and transported through the feedthroughs 60 via the ports 120 to the air directing space 153 formed by the sleeve 152 and the base 151 of the centrifuge container 30, and from there through the inlet opening 163 embodied as an annular gap 163 between the centrifuge container 30 and the sleeve 152 of the centrifuge motor 26, close to the axis, into the centrifuge container 30.

[0090] The rotation of the centrifuge rotor 28 in the direction of rotation results in an impeller effect, causing the exhaust air to be thrown outward against the centrifuge container 30, thereby accelerating it. As a result, the sucking in of the supply air 160 takes place automatically, wherein such effect is further supported by the fact that, as shown in FIG. 4, the feedthroughs 60 run spirally inwards in the direction of rotation.

[0091] The supply air 160 enters the annular gap 164 located between the centrifuge container 30 and the upper part 138 of the housing 12 (the annular gap 164 is bounded by the upper flange 165 of the centrifuge container 30 and the upper part 138 of the housing 12) and is directed through the upper part 40 with the collar 130 into the intermediate space 166 between the centrifuge container 30 and the safety container 32, which extends around the centrifuge container 30. The exhaust air 162 is directed through the two gaps 50 and the ports 122 to the feedthroughs 62, and from there into the feedthroughs 82. From the feedthroughs 82, the exhaust air 162 continues into the exhaust air channels 156 until it meets the wedge 100 and from there is directed past the centrifuge motor 26 in the direction of the cooling fin element 36 and the electronic components 34.

[0092] The flow directions of supply air 160 and exhaust air 162 are each indicated by arrows.

[0093] It can be seen that the supply air is introduced directly from the cold base region into the centrifuge container 30, bypassing warm regions of the centrifuge 10. This is done without any assistance from blowers and the like, because the rotation of the centrifuge rotor 28 produces an impeller effect, drawing the supply air 160 into the centrifuge container 30. This results in particularly effective cooling of the centrifuge rotor 28 with the samples contained therein along with the centrifuge container 30.

[0094] Subsequently, the supply air 160 flows over the annular gap 164 and is guided in contact with the centrifuge container 26 in the intermediate space 166 between the centrifuge container 26 and the safety container 32, resulting in further cooling of the centrifuge container 26 and thus the centrifuge rotor 28 with the samples contained therein.

[0095] Finally, once the centrifuge container 30 has been cooled, the exhaust air 162 is still used to cool the centrifuge motor 26 along with the electronic components 34 and their cooling device 36, thereby reducing the heat input of such elements 26, 34, 36 into the centrifuge container 30 from the outset, which ultimately also results in the cooling of the centrifuge container 30 along with the centrifuge rotor 28 with the samples contained therein.

[0096] It is also clear from the foregoing illustration that a centrifuge 10 is provided with a temperature control that operates more effectively than previously used temperature-controlled centrifuges. At the same time, such temperature control can also be used to cool heat-emitting centrifuge components, such as centrifuge motor 26 and electronic components 34, 36. In addition, such temperature control also functions if a safety container 32 is arranged around the centrifuge container 30.

[0097] Unless otherwise indicated, all features of the present disclosure may be freely combined with each other in isolation from other features. Also, unless otherwise indicated, the features described in the figure description can be freely combined as features in isolation with the other features. In doing so, features of the device can also be reformulated as method features and method features can be reformulated as device features.

LIST OF REFERENCE SIGNS

[0098] 10 Centrifuge, laboratory centrifuge [0099] 12 Centrifuge housing [0100] 14 Centrifuge lid [0101] 16 Side walls [0102] 17 Back wall [0103] 18 Front [0104] 20 Base [0105] 22 Control unit [0106] 26 Centrifuge motor [0107] 28 Centrifuge rotor [0108] 30 Centrifuge container [0109] 32 Safety container [0110] 34 Electronic components of the centrifuge 10 [0111] 36 Cooling fin element [0112] 38 Air directing means [0113] 40 Upper part of the air directing means 38 [0114] 42 Lower part of the air directing means 38 [0115] 44 A piece of the lower part 42 of the air directing means 38 [0116] 46 Other piece of the lower part 42 of the air directing means 38 [0117] 48 Raised rim of the one piece 44 [0118] 50 Two recesses arranged laterally opposite each other in the rim 48 [0119] 54 Central aperture of the one piece 44 [0120] 56 Four first connecting pieces [0121] 58 Two second connecting pieces [0122] 60 Feedthroughs of the four first connecting pieces 56 [0123] 62 Feedthroughs of the two second connecting pieces 58 [0124] 64, 66 Circumferential projections, fins [0125] 67 First connecting region [0126] 68 Central recess of the other piece 46 [0127] 70 Partial circumferential rim 70 of the other piece 46 [0128] 72, 74 Second connecting regions [0129] 76 Four first depressions [0130] 78 Two second depressions [0131] 80 Feedthroughs of the four first depressions 76 [0132] 82 Feedthroughs of the two second depressions 78 [0133] 84, 86 Circumferential projections, fins [0134] 88 Connecting projection, fin [0135] 90 Joining projection, fin [0136] 92 Exhaust air inlet [0137] 94 Exhaust air outlet [0138] 96 Three fillets [0139] 98 Fastening elements of the centrifuge motor 26 in the housing base 20 [0140] 100 Curved wedge [0141] 102 Common projection of the two feedthroughs 82, fin [0142] 104, 106 Oppositely arranged third connecting regions [0143] 108 Supply air ports, projections, fins [0144] 110, 112 Circumferential projections, fins [0145] 114 Connecting projection, fin [0146] 116, 118 Connecting projections, fins [0147] 120, 122 Ports [0148] 124, 126, 128 Connecting projections, fins [0149] 130 Inner circumferential collar of the upper part 40 of the air directing means 38 [0150] 132, 134, 136 Moldings [0151] 138 Upper part of the housing 12 [0152] 140 Axial projection, fin [0153] 142 Base of the safety container 32 [0154] 144, 146 Apertures in the base 142 [0155] 148 Boreholes in the base 142 [0156] 150 Central opening in the base 142 [0157] 151 Base of the centrifuge container 30 [0158] 152 Sleeve of the centrifuge motor 26 [0159] 153 Air directing space [0160] 154, 156 Air directing channels [0161] 158 Apertures in the base 20 of the housing 12 [0162] 160 Supply air [0163] 162 Exhaust air [0164] 163 Annular gap between the centrifuge container 30 and the sleeve 152 of the centrifuge motor 26, inlet opening for supply air 160 into the centrifuge container 30 [0165] 164 Annular gap between the centrifuge container 30 and the upper part 138 of the housing 12 [0166] 165 Upper flange of the centrifuge container 30 [0167] 166 Intermediate space between the centrifuge container 30 and the safety container 32 [0168] D Direction of rotation of the centrifuge rotor 28 [0169] A Axis of rotation