JPS6026801Y2 - rotary evaporator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary evaporator, and more specifically, it is capable of automatically raising and lowering an elevating body rotatably supporting a sample container such as an eggplant-shaped flask. The present invention also relates to a novel rotary evaporator in which the ascent and descent limits of the elevating body can be arbitrarily set.

In a conventional rotary evaporator, an elevating body that rotatably supports a sample container such as an eggplant-shaped flask is generally raised and lowered by manual operation of a type of link mechanism using a lever or the like.

Therefore, in the past, the positioning of the oval flask with respect to the water spring was done by visual estimation, and when the layer line was to be repeated many times, the repeated lifting and lowering of the elevating body was troublesome.

The present invention was devised in view of the above-mentioned conventional problems, and is configured to automatically raise and lower an elevating body that supports an oval-shaped flask, etc. It is possible to arbitrarily set the upper limit and lower limit of .

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of the rotary evaporator, and FIG. 2 is a side view thereof.

Briefly, the rotary evaporator according to the present embodiment is provided with an elevating body 5 supported on a support column 3 (see Fig. 3) erected on a base so as to be movable up and down. The hollow rotating shaft 9 (
Sample container 1 such as an eggplant-shaped flask at one end (see Figure 4)
1 is removably attached, a condenser 13 is detachably attached to the other end of the rotating shaft 9, and a water bath 15 for heating the sample container 11 is provided. be.

Next, details of each part will be explained.
Since the condenser 13 has the same configuration as a general one, detailed explanation thereof will be omitted.

Although detailed illustration of the water bath 15 is omitted, the water bath 15 is equipped with a heater that heats water and a temperature sensor that detects the water temperature.
N and OFF are controlled by a control device such as a microcomputer, and the water temperature in the water bath 15 is always maintained at a set temperature.

The elevating body 5 is attached to the pillar 3 erected on the base 1.
A guide hole 50 formed on the base side of the lift body 5 is fitted therein so as to be vertically movable, and the rotary drive device 7 is supported on the tip side of the elevating body 5.

This rotary drive device 7 is rotatably supported by a horizontal shaft 17 that is fitted and fixed into a mounting hole 51 horizontally drilled in the elevating body 5 .

That is, by loosening the lever 19 provided on the rotation drive device 7, the rotation drive device 7 can be rotated (tilted) about the horizontal axis 17, and by tightening the lever 19, the rotation drive device 7 can be rotated (tilted) about the horizontal axis 17. 7 can be integrally fixed to the horizontal shaft 17.

Therefore, by appropriately rotating and fixing the rotation drive device 7, the inclination angle of the sample container 11, etc. can be adjusted.

A vertical fitting hole 5 is provided near the center of the elevating body 5.
F is bored, and this fitting hole 5F has a flange 21F.
The nut member 21 provided with this is loosely fitted.

That is, the fitting hole 5F and the nut member 2 are arranged so that slight relative movement between the nut member 21 and the elevating body 5 can be tolerated.
1. There is a slight gap between the two.

A bullet 25 such as a coil spring is loaded between the heads of a plurality of bolts 23 that loosely pass through the flange 21F of the nut member 21 and are integrally screwed onto the elevating body 5 and the flange 21F. be.

In this embodiment, the nut member 21 is fitted into the fitting hole 5F from below, but it may also be fitted from above.

The nut member 21 is threadedly engaged with a screw rod 27 for lifting/lowering operation provided parallel to the pillar 3.

The upper end of the lifting rod 27 is rotatably supported via a bearing 31 on a bracket 29 fixed to the upper end of the column 3 with a plurality of bolts, and the lower end is
It is rotatably supported by a sub-base 35 supported by the base 1 via a plurality of shock absorbers 33 such as elastic rubber.

Therefore, the horizontal end of the lower end of the lifting rod 27 is tilted slightly to the left, but since the nut member 21 and the lifting body 5 are loosely fitted,
The nut member 21 is slightly inclined with respect to the elevating body 5, and there is no problem in the threaded engagement between the nut member 21 and the elevating screw 27.

Therefore, the vertical movement of the vertical movement of the vertical movement body 5 is performed smoothly by the rotation of the vertical movement screw 27, and no chattering noise is generated.

As mentioned above, when the elevating body 5 is moved up and down along the column 3 by the rotation of the motor 39, the upper and lower limits are as follows.
It is arbitrarily set by an upper limit setting device 45 and a lower limit setting device 47 which are mounted on the upper end side and the lower end side of the column 3 so as to be able to freely adjust their positions.

The upper limit setting device 45 and the lower limit setting device 47 are fixed to the support column 3 with fixing devices 49a, 49b such as bolts, and are each equipped with a detection device 51, 53 such as a limit switch.

Therefore, each detection device 51, 53 is actuated by the rise or fall of the elevating body 5, and can be slightly displaced in the direction.

A worm gear 37 is integrally fixed near the lower end of the screw rod 27 for lifting/lowering operation, and this worm gear 37 is integrally fixed to an output shaft 41 of a motor 39 for forward and reverse rotation mounted on the sub-base 35. It is always fitted with the worm 48 provided in the.

Therefore, by appropriately rotating the motor 39, the elevating screw 27 is rotated forward or backward, and the elevating body 5 is moved up and down along the column 3.

At this time, since the rotary drive device 7 is attached to the tip end of the lifting body 5, the screw rod 27 for lifting/lowering operation is mainly curved so that the upper and lower center portions protrude slightly to the left in FIG. However, the sub-base 35 that supports the lower end of the screw rod 27 for lifting operation is slightly displaced to the left in FIG.
Due to the relatively slight displacement caused by the loose fitting, the lifting screw 27 is prevented from curving.

That is, when the lifting screw 27 is lowered in FIG. 3, it can set an upper limit and a lower limit for the lifting body 5 by stopping the rotation of the motor 39.

Therefore, the position of the sample container 11 with respect to the water bath 15 can be maintained at all times, and the elevating body 5 can be
It is possible to prevent waste that increases the amount of water.

Note that the motor 39 can be stopped when the load on the motor 39 changes due to the lifting body 5 coming into contact with the upper limit setting device 45 or the lower limit setting device 47. , this motor 3
It is also possible to stop the motor 39 by detecting the load fluctuation of 9.

The motor 39 and the like are housed inside the casing 55, and the support column 3 and the like are housed inside the cover 57.

The rotary drive device 7 is constructed as shown in FIG.

That is, an annular cap 61 is fixed to one end of a stator frame 59 shaped like an inner peripheral housing in the rotary drive device 7, and a stator core 63 is fixed within the stator frame 59.

Rotor core 65 located in the center of the stator core 63
is fixedly supported by the hollow rotating shaft 9, and both ends of the rotating shaft 9 are connected to the stator frame 59 and the cap 6.
1 via a bearing 67 so as to be rotatable.

A slit disk 69 is integrally attached to the rotating shaft 9.

This slit disk 69 is provided very close to the rotor core 65, and has an extremely large number of small holes or slits (not shown) equidistantly spaced along its outer periphery. is a gap 71S between the photosensors 71 mounted on the stator frame 59 close to the stator core 63.
passing through the inside.

Therefore, when the rotating shaft 9 rotates by starting the rotational drive device 7, a pulse is output from the photosensor 71.

Therefore, by counting these pulses, the rotational speed of the rotary drive device 7 can be detected, and by performing feedback control or the like, the rotation of the rotary drive device 7 can be accurately controlled.

A hollow tube body 73 is fitted and fixed to the rotating shaft 9.

One end of this hollow tube body 73 is formed into a tapered device part 73F for removably attaching the sample container 11 such as the eggplant-shaped flask, and the other end is connected to the stator of the rotary drive device 7. The condenser 13 (the first
(see figure).

The condensing portion 13 is fixed to a threaded portion 75 projecting from the center of the other end of the stator frame 59 with an annular nut 77.

As can be understood from the above configuration, since the rotation detector consisting of the photosensor 71 and the slit disk 69 is installed inside the stator frame 59 in close proximity to the stator core 63, etc.,
The rotary drive device 7 can be downsized as a whole.

Furthermore, since the rotational speed of the rotary drive device 7 is detected by the slit disk 69 and the photosensor 71, there is no electromagnetic influence even if the rotational drive device 7 is close to the stator core 63, and even at extremely low speeds. However, the rotational speed can be detected accurately, and by performing feedback control or the like, the rotational drive device 7 can be accurately controlled even during low-speed rotation.

In the above configuration, depending on the size of the sample container 11 to be used, the inclination angle of the rotary drive device 7 can be arbitrarily set by operating the lever 19, and the height positions of the upper limit setting device 45 and the lower limit setting device 47 can be set as desired. Set as appropriate.

Thereafter, when the motor 39 is started and the elevator rod 27 is rotated in the forward direction, the elevator 5 is raised, and the motor 39 is stopped at the position where the upper limit setting device 45 is activated.
rise is stopped.

When the elevating body 5 is raised and stopped in this way, the sample container 11 is removed from the rotation drive device 7,
A suitable sample is put into the sample container 11.

Next, when the rotation drive device 7 is started, the sample container 11 is rotated.

On the other hand, when the motor 39 is started and the lifting screw 27 is reversely rotated, the lifting body 5 is lowered and the sample container 11
is placed into the water bath 15.

When the lower limit setting device 47 is activated due to the lowering of the elevating body 5, the motor 39 is stopped and the elevating body 5 is positioned at its stop position.

When the sample container 11 is rotated and heated in the water bath 15, the sample in the sample container 11 evaporates and becomes concentrated.

On the other hand, the steam is condensed in the condenser 13.

As mentioned above, when the elevating body 5 is moved up and down by the rotation of the motor 39, even if an unbalanced load is applied to the elevating body 5,
As mentioned above, the elevating body 5 is smoothly moved up and down.

Further, since the upper and lower limit positions of the elevating body 5 are arbitrarily set in advance, it is possible to efficiently perform concentration etc. repeatedly using sample containers 11 of the same capacity.

Furthermore, since the rotary drive device 7 does not include a speed reduction mechanism and is made smaller and lighter, the unbalanced load acting on the elevating body 5 is reduced.

As can be understood from the above description of the embodiments, the gist of this invention is as stated in the claims of the utility model registration. The lower limit position can be set arbitrarily, and the elevating body can be automatically positioned at the set position.

Therefore, the vertical movement stroke of the elevating body can be set according to the inclination angle and the capacity of the sample container, and the positioning of the sample container with respect to the water bath can be maintained constant.

That is, for example, when a small amount of sample is repeatedly concentrated using a small-capacity sample container, efficient concentration can be achieved by setting the vertical movement stroke of the elevating body small.

In addition, the nut member is loosely fitted into the fitting hole provided in the elevating body, and the lower end of the screw for elevating and lowering is supported on the sub-base which can be slightly displaced in the horizontal direction.
If an unbalanced load (unilateral load) acts on the elevating body and tends to cause the screw to curve, the sub-base is slightly displaced to prevent the screw from curving, and to prevent the screw from bending between the nut member and the elevating body. A slight inclination of the elevating body with respect to the screw punch will be absorbed between the fitting hole and the fitting hole.

Therefore, an inconvenient threaded state does not occur between the screw punch and the nut member, and the vertical movement of the elevating body can be performed smoothly without producing chattering noise or the like.

Note that this invention is not limited to the above-mentioned embodiments; by making appropriate design changes,
It can be implemented in other ways.

[Brief explanation of drawings]

Figure 1 is a front view of the evaporator, Figure 2 is a side view, and Figure 3 is a front view of the evaporator.
The figure is a longitudinal cross-sectional view of the main part, and FIG. 4 is a cross-sectional view of the rotary drive device. Explanation of the symbols representing the main parts of the drawing, 11...
・Sample container, 13...Condenser, 15...
・Water pass, 1...Base, 3...
・Strut, 27... Screw for lifting/lowering operation, 39...
...Motor, 7... Rotation drive device, 5...
... Lifting body, 45 ... Upper limit setting device, 47.
...lower limit setting device.

Claims (1)

[Scope of utility model registration request] The rotary evaporator is equipped with a rotatable sample container, a condenser, and a water bath for heating the sample container. The sample container is rotatably supported on a sub-base which is provided on the base through a buffer body 33 so as to be slightly displaceable in the horizontal direction, and also interlocked and connected to a motor mounted on the sub-base. A nut member that is loosely fitted into a fitting hole formed in an elevating body that rotatably supports a rotary drive device that rotates a sample container is provided, and is screwed into the screw rod for the elevating operation, and the elevating body is An upper limit setting device that is movable up and down along the column, and an upper limit setting device that sets the upper limit position of the elevating body and a lower limit setting device that sets the lower limit position are provided on the column so that the vertical position can be adjusted, and the upper limit setting device or A rotary evaporator characterized in that the motor is stopped after the vertical position of the elevating body is set by a lower limit setting device.