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`1.
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`An ultra—low temperature freezer comprising:
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`an insulated case defining a storage compartment
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`having an opening in an upper face;
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`an insulated door configured to be able to open and
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`close the opening;
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`a first refrigeration unit configured such that a
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`first compressor, a first condenser, and a first
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`decompressor are mounted on a first mounting board;
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`a second refrigeration unit configured such that a
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`second compressor, a second condenser, and a second
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`decompressor are mounted on a second mounting board;
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`a machinery compartment provided adjacent
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`to the
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`insulated case,
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`the machinery compartment being configured
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`to house the first refrigeration unit and the second
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`refrigeration unit so as to be independently drawable in a
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`horizontal direction; and
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`a control unit where a control circuit is mounted; the
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`control unit being configured to be drawable independently
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`of the first refrigeration unit and the second
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`refrigeration unit,
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`the first refrigeration unit,
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`the second refrigeration
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`unit, and the control unit being housed in the machinery
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`compartment so as to be stacked in a vertical direction.
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`2.
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`An ultra—low temperature freezer according to claim
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`1, further comprising:
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`a control—unit—mounting board where the control unit
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`is mounted,
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`the control—unit—mounting board being
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`integrally configured with the control unit, wherein
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`5
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`lO
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`15
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`20
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`25
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`30
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`39
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`the control—unit-mounting board including
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`a main body portion including a mounting hole
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`through which the control circuit is mounted, and
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`a reinforcing plate mounted along a lateral
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`direction of the main body portion
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`3.
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`An ultra—low temperature freezer according to claim
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`1, wherein
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`an arrangement of the first compressor,
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`the first
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`condenser, and the first decompressor in the first
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`refrigeration unit is identical to an arrangement of the
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`second compressor,
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`the second condenser, and the second
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`decompressor in the second refrigeration unit.
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`4.
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`An ultra—low temperature freezer according to claim
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`1, wherein
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`10
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`15
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`the first mounting board includes a pair of first
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`extending portions provided to a pair of side~edge
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`portions along a drawing—out direction of the first
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`20
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`refrigeration unit, and
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`the machinery compartment
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`includes a pair of first
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`rail members configured to guide the pair of first
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`extending portions in the drawing out direction.
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`25
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`5.
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`An ultra—low temperature freezer according to claim
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`4, wherein
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`the second mounting board includes a pair of second
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`extending portions provided to a pair of side—edge
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`portions along a drawingvout direction of the second
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`30
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`refrigeration unit, and
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`40
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`the machinery compartment
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`includes a pair of second
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`rail members configured to guide the pair of second
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`extending portions in the drawing~out direction.
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`6.
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`An ultra—low temperature freezer according to claim
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`1, wherein
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`a first reinforcing portion is formed, on a lower
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`surface side of the first mounting board,
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`to extend along
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`the drawing—out direction of the first refrigeration unit.
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`7.
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`An ultra—low temperature freezer according to claim
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`6, wherein
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`the first reinforcing portion is a plate member that
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`is folded along the drawing—out direction of the first
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`refrigeration unit and mounted to a lower surface of the
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`first mounting board.
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`8.
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`An ultra—low temperature freezer according to claim
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`6, wherein
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`a second reinforcing portion is formed, on a lower
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`surface side of the second mounting board,
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`to extend along
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`the drawing—out direction of the second refrigeration unit.
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`10
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`15
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`20
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`9.
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`An ultra«low temperature freezer according to claim
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`25
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`8, wherein
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`the second reinforcing portion is a plate member that
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`is folded along the drawing—out direction of the second
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`refrigeration unit, and mounted to a lower surface of the
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`second mounting board.
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`30
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`41
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`10.
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`An ultra-low temperature freezer according to claim
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`6, wherein
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`the machinery compartment
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`includes a first support
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`member that provides support,
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`from below, at the first
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`reinforcing portion when the first refrigeration unit is
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`drawn out
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`in the drawing—out direction and
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`a height of the first reinforcing portion is set to a
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`height at which the first reinforcing portion contacts the
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`first support member when the first refrigeration unit is
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`10
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`drawn out.
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`11.
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`An ultra-low temperature freezer according to a
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`claim 10, wherein
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`15
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`20
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`the machinery compartment
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`includes a second support
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`member that provides support,
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`from below, at the second
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`reinforcing portion when the second refrigeration unit is
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`drawn out
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`in the drawing—out direction, and
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`a height of the second reinforcing portion is set to a
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`height at which the second reinforcing portion contacts
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`the second support member when the second refrigeration
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`unit is drawn out.
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`42
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