JPH0454809Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a stirring device with an airtight joint used for stirring and mixing chemicals that produce flammable and corrosive gases.

``Prior art'' Conventionally, when stirring and mixing flammable and corrosive chemicals under low or high pressure, when stirring is performed with a stirring shaft connected to a normal motor, the mixture generates The flammable gas generated by the motor may ignite the spark of the motor and cause a fire. Moreover, if the motor is exposed to corrosive gas for a long period of time, the housing of the motor may be damaged over time, allowing the flammable gas to enter. Therefore, when a conventional stirring device is used to mix and stir chemicals that produce flammable and corrosive gases, an example of a device that has the function of preventing corrosion of the motor is disclosed in Japanese Utility Model Application No. 59-60843.

``Problems to be solved by the invention'' As shown in FIG. 4, the conventional stirring device consists of an excitation coil 51, which is a fixed part, and a rotor 5, which is a rotating part.
2 and to protect the excitation coil 51 of the motor from the flammable and corrosive gases generated by the chemical, the motor is covered with a thin film 53 of resin or the like and sealed, but this requires time and effort to manufacture. This has the problem of inevitably increasing costs.

``Means for Solving the Problems'' The present invention has been made in view of the above-mentioned problems. An O-ring is housed in the groove, and a cylindrical shaft having a large-diameter driven magnet at the upper end is rotatably supported in the through hole provided at the center of the plug body. A cover body, in which a stirring shaft having stirring blades is attached, a motor having a driving magnet located on the same axis as the driven magnet and having a driving magnet in the lower part for moving the driven magnets toward each other is accommodated in the cover body, and the lower part is sealed with a partition plate is attached to the plug body. The mounting structure is intended to solve the above-mentioned problems.

"Function" Since the entire motor housed in the cover body is airtightly covered with a partition plate, when stirring chemicals that produce flammable and corrosive gases, the motor is not affected by the gas, and the excitation of the motor is reduced. There is no need to provide a wide gap between the coil and the rotor.

"Example" An example of the present invention will be described based on the drawings.
A driving motor 7 consisting of an excitation coil 5 as a fixed part and a rotor 6 such as a rotor is housed in a cavity 2 provided inside a cover body 1 made of synthetic resin such as plastic. A drive magnet 8 having a somewhat large diameter is fixed to the lower end of the motor shaft of this motor 7. A threaded groove 3 is formed on the inner surface of the lower part of the cover body 1, and the end of a cord wire 9 drawn out from the cylindrical part 4 provided at the center of the upper surface of the cover body is connected to the excitation coil 5. The periphery of the lead-out cord wire 9 located at the position is fixed by molding or immersion using silicone resin or the like to prevent outside air from entering.

Reference numeral 10 denotes a partition plate made of a thin plate having chemical resistance such as stainless steel or plastic, and the outer surface of the peripheral wall is formed with a male threaded portion 11 that screws into the threaded groove 3, and the inner surface of the peripheral wall is provided with a female thread. A section 12 is provided. A tapered concave bearing 13 is formed at the center of the lower surface of the partition plate 10.

Reference numeral 15 denotes a stopper body made of a relatively flexible material such as hard rubber or synthetic resin, which is fitted into a narrow opening 41 of a stirring container 40 such as a flask to seal the inside. A connecting thread 17 is formed on the upper outer periphery of a large-diameter holding collar 16 provided at the top. A threaded body portion 18 provided on the lower outer periphery of the holding collar 16
The fixed holding part 19 is screwed together. An O-ring 21 is placed in an annular groove 20 formed continuously on the connecting thread 17.
An insertion portion 23 is provided with a tapered diameter at the bottom of the annular groove 20, a through hole is formed in the center of the plug body 15, and bearings 24 are provided at the upper and lower ends of the through hole 22, respectively. .

A cylindrical shaft 25 is inserted into the through hole 22, and a large diameter driven magnet 26 is fixed to the upper end thereof, and a projection 27 is formed at the center of the upper surface of the driven magnet. This driven magnet 2
6 and the drive magnet 8 are positioned on the same axis, and a known chuck 28 is attached to the lower end of the cylinder shaft 25.
A stirring shaft 31 having a stirring blade 30 at the lower end is inserted into the cylindrical shaft 25, and after adjusting the stirring shaft to a predetermined length, the chuck is tightened and fixed.

In the figure, 35 is a drive device with an airtight joint formed by integrally attaching the plug body 15 and the cover body 1;
is an o-ring.

Next, to explain the operation of this embodiment, when the plug main body 15 is inserted from the insertion part 23 into the opening 41 existing at the upper end of the stirring container 40 which accommodates chemicals etc. that emit flammable and corrosive gases, the annular groove The O-ring 21 inside the plug body 15 and the opening 41
and the inner surface of the opening 41, and then the fixed holding part screwed onto the threaded body 18 is rotated to bring the lower surface of the fixed holding part 19 into contact with the upper end of the opening 41. This prevents the stopper body 15 from swinging laterally.

The male threaded part 11 of the partition plate 10 is screwed into the threaded groove 3 of the cover body 1, and the female threaded part 12 is threaded into the connecting thread 17 of the plug body, and the O-ring 36 is attached to this threaded part. By doing so, the cover body 1 and the stopper body 15 are airtightly fixed.

Even if the flammable and corrosive gas generated from the mixture in the stirring container 40 rises through the through hole 22 in the stopper body 15, it is blocked by the partition plate 10, and the flammable gas etc. The excitation coil 5 of the motor is not affected by the flammable gas.

Maintenance and inspection of the motor 7 can be easily carried out by removing the partition plate 10 from the threaded groove 3 of the cover body 1. Moreover, the cylindrical shaft 9 is rotatably supported in each through-hole 22 by a bearing 38, and furthermore, a protrusion 27 located at the center of the upper surface of the driven magnet 26 is mounted in a concave bearing 23 located at the center of the lower surface of the partition plate 10. Therefore, the axis of the cylindrical shaft 9 that holds the stirring shaft 31 will not shift. Therefore, the drive magnet 8 and the driven magnet 26 are brought into close contact with each other with the partition plate 10 in between, and both rotate together due to magnetic force.

"Effects of the invention" This invention has the following effects.

By housing the motor integrated with the drive magnet inside the cover body and sealing it with a partition plate, the motor will not be damaged over time by flammable and corrosive gases generated from the mixture, improving durability. can be done.

This eliminates the need to create a large gap between the excitation coil and rotor that makes up the motor, which is required for airtight plastic coating or chemical-resistant thin film processing. Since the motor can be made smaller and the overall size can be made smaller, the stirring device can be easily assembled, improving operability and making it convenient to handle.

By narrowing the gap between the excitation coil and the rotor, the performance of the motor can be fully brought out, making it possible to obtain powerful driving force with a small size.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway front view, FIG. 2 is an exploded cross-sectional view, and FIG. 3 is a partially cutaway front view showing the state of use. FIG. 4 is a partially cutaway front view of a conventional device. DESCRIPTION OF SYMBOLS 1... Cover body, 3... Threaded groove, 5... Excitation coil, 6... Rotor, 7... Motor, 8... Drive magnet, 10... Partition plate, 11... External threaded part, 12
... Female threaded portion, 13 ... Concave bearing, 15 ... Plug body, 17 ... Connection thread, 18 ... Thread body, 19
... Fixed holding part, 20 ... Annular groove, 21, 36 ...
... O-ring, 22 ... Through hole, 23 ... Bearing,
25... cylinder shaft, 26... driven magnet, 28... chuck, 30... stirring blade, 31... stirring shaft, 41
……Aperture.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An O-ring is housed in an annular groove provided on the outer periphery of a stopper body that fits into the opening of a stirring container containing a substance to be mixed, and is provided at the center of the stopper body. A cylindrical shaft having a large-diameter driven magnet at the upper end is rotatably supported in the through hole, and a stirring shaft having a stirring blade at the lower end is attached to the lower part of the cylindrical shaft, coaxially with the driven magnet. A stirring device with an airtight joint, comprising: a cover body having a motor having driving magnets located at a lower part thereof and the lower part thereof being sealed with a partition plate; the lower part thereof being sealed with a partition plate; (2) The airtight joint according to claim 1 of the utility model registration claim, in which a concave bearing that pivotally supports a protrusion provided at the center of the upper surface of the driven magnet, which rotates integrally by the magnetic force of the driving magnet, is provided at the center of the lower surface of the partition plate. Partial stirring device.