Constant-temperature device provided with rotating specimen table
Provided is a constant-temperature device which comprises conveyance mechanism and which can operate stably over a long period of time even when installed in an atmosphere of a sterilization gas having strong oxidative properties, such as hydrogen peroxide gas, or a high temperature environment during dry-heat sterilization operations. A drive unit for a rotatably operated specimen table ( 10 ) on which a specimen is placed, in an incubation chamber, is arranged outside of the incubation chamber, and the drive-force from the drive unit is transmitted by means of magnetic coupling. Furthermore, ring-shaped seal packing ( 22 ), in which a lip ( 24 ) is formed, is arranged above and below a base plate ( 13 ) provided to the specimen plate ( 10 ), and a seal plate ( 23 ) is arranged along the entire perimeter of the base plate ( 13 ) at the portion which makes contact with the lip ( 24 ), thus a bearing ( 17 ) and/or a drive portion are isolated from high-temperature atmospheres and in-chamber atmospheres having strong oxidative properties, preventing damage due to high temperatures or sterilization gas.
1. A constant-temperature device comprises;
thermostatic chamber having a closed space and walls surrounding said closed space;
a rotating magnetic field generation means for giving a rotating field having a rotation center in a vertical axis direction from an underside of a floor face of a bottom portion of the walls to the closed space through the floor face;
a base plate detachably screwed on the floor face through brackets in the closed space of the thermostatic chamber, being supported by support blocks each having a resin-made pad at a portion where the floor face comes in contact, said pad receiving a load from upper side, wherein the base plate has a bearing having a center of a rotating shaft at a position meeting the rotation center in the vertical axis direction, a specimen plate mounted specimen shelves each saving a container storing a specimen is connected to an upper side rotating shaft over the bearing, and a magnet plate having a plurality of driven magnets is connected to the rotating shaft on a lower side of the bearing, and the driven magnets are magnetically coupled with the rotating field transmitted through the walls of the thermostatic chamber to rotate the rotating shaft in accordance with the rotating field, and;
ring-shaped seal packings each including a lip, provided to a top and a bottom of the bearing, wherein one of the seal packings is placed between the base plate and the specimen plate, and the driving magnets are placed between the magnet plate to isolate the bearing from the atmosphere of the closed space.
2. A constant-temperature device claimed in claim 1 , wherein the rotating magnetic field generation means comprises a housing unit rotating at the rotation center and a plurality of driving magnets mounted on the housing unit in a state that mutual arrangement positions are regulated.
3. A constant-temperature device claimed in claim 1 , wherein the ring-shaped seal packings are made of fluororubber.
4. A constant-temperature device claimed in claim 1 , wherein the base plate is provided with a seal plate at a position where the lip of the ring-shaped seal packing comes into contact, said seal plate including a surface coming into contact with the lip, said surface being smoothed.
5. A constant-temperature device claimed in claim 1 , wherein the base plate is provided with a pad made of heat resistant resin to a portion where the floor face of the thermostatic chamber comes into contact.
6. A constant-temperature device claimed in claim 1 , wherein the base plate further comprises a flow channel for communicating an outside of the closed space to a space around a center axis, said space being isolated through the ring-shaped seal packings, and said space having a gas introduced from the outside of the closed space.
7. A constant-temperature device claimed in claim 6 , wherein said gas is cleaned air.
8. A constant-temperature device claimed in claim 6 , wherein said gas is nitrogen gas.