RU214814U1 - Quick-release mechanical laboratory stirrer with conical adapter - Google Patents

Abstract

The utility model relates to laboratory chemical equipment and is a device for mixing liquids and bulk substances in vessels. The device includes a body of the device, containing an electric motor and a gear mechanism of the axle drive with a clamp and a separate block for switching on and controlling the rotation of the electric motor. The body of the device contains an adapter designed to be placed in a conical section, while the specified adapter is provided with a hole through which an axis passes, equipped with blades for mixing the contents of the vessel.

Description

Technical field

The utility model relates to laboratory chemical equipment and represents an improved version of an overhead (mechanical) stirrer for some applications. Used for mass transfer (mixing) of liquids, suspensions, pastes, heterogeneous media, reaction mixtures.

State of the art

A device for mixing solid and liquid components (SU 389832 A1) is known, consisting of a vessel with a plug equipped with an elastic diaphragm with a lever, one end of which has a working body, and the other end is connected to an electric motor through a crank in the form of a disk. The disadvantages of this design are associated with wear of the movable part of the diaphragm and the complexity of servicing the crank, as well as with high requirements for tolerances of parts of the miniature mechanism.

Known laboratory mixer, which is used as a drive motor-reducer, mounted on top of the supporting vertical rack (EN 137229 U1). The transmission is made in the form of a belt drive, consisting of a pulley fixed with a key connection on the axis of the gearbox, connected through a V-belt to a pulley fixed with a key connection on a cylindrical rotor, which is inserted through two bearings into a vertical cylindrical housing connected through a plate-bracket to the rack ; moreover, the working shaft with the blade is inserted inside the rotor and connected to it by means of a bolt lock in two positions: in the working position, when the blade is lowered to the bottom of the tank, and in the upper position, when the mixture is unloaded from the tank. The laboratory mixer may include a removable container for mixing and cleaning the mixture, installed in the vessel of the heating furnace. The disadvantages of the design are the dimensions of the system assembly, the complexity of adjusting the mixing element in height.

Known magnetic stirrer, which uses electromagnets that allow you to oscillate mixing elements made in the form of various forms (SU 117608 A1). However, this type of device cannot provide enough torque to stir viscous liquids, some suspensions, or large volumes.

The electromagnetic axial stirrer contains a linear motor or a linear servomotor configured to select the amplitude, frequency, acceleration, duration of the stirring movement and the selection of stirring and pause cycles. The engine is located between the platforms and is attached to them using racks with threaded ends. On the upper platform there is a base for sample containers closed with lids. A magnetic rod passes through the linear motor, carrying out the axial mixing movement of the base with the sample tanks. The technical result consists in the possibility of a wide choice of vertical mixing parameters. The main disadvantage is the size of the structure and a large number of supporting elements.

In the mixer (SU 151866 A1), the working container is made in the form of a ball resting on three rollers located at an angle to its vertical axis. This simplifies the design of the mixer and improves the quality of mixing. However, during mixing, there is no access to the medium of the working vessel, which limits the synthetic applicability of this approach to mixing.

The modern mechanical overhead stirrer (US 2010039883 A1) is a time-tested, reliable laboratory instrument with various add-ons, design variations and powerful electronics. However, even a modern overhead stirrer is used only in cases where the magnetic stirrer lacks torque, and this is due less to the choice of a sealed glass adapter, and more to the complexity of assembling a laboratory setup. It is the time factor and the relative difficulty of connecting a mechanical stirrer that are its main drawback at the moment. Nevertheless, there are models (https://www.syrris.com/modules/atlas-scorpion-overhead-stirrer/) that are included (similarly to the proposed formula) directly into the reaction vessel, but it should be noted that, unlike the proposed models All such models are created for specific laboratory equipment and are absolutely not universal.

A similar complexity of connecting a mechanical stirrer to laboratory equipment is typical for all modern models, for example, KR 101773797 B1 or US 2016136594 A1. Therefore, the technical problem of express device connection remains relevant and timely.

Essence disclosure

The technical problem of the present utility model, which has not been solved by the closest analogues, is the inability to use in various vessels using various plug-in axes-grooves for mixing without a tripod or any other device for fastening, which would significantly reduce the complexity of the assembly process of a laboratory instrument for carrying out the reaction.

The technical result, which is achieved in the process of solving this technical problem, is the possibility of simplified mounting / dismantling of the stirrer mounted on a conical holder directly into the chemical device; vibration is reduced due to the alignment of the stirrer axis and the neck of the flask. This leads to an increase in the wear resistance of glass chemical glassware and an increase in the life of the parts of the device.

The technical problem is solved, and the technical result is achieved due to the presence of a technology not described in the scientific and technical literature for quickly installing a mixing device directly into the reaction vessel with the creation of a tight hermetic connection and with simultaneous automatic adjustment of the mixing element to the depth of this vessel due to the ability to move this element (and fix later) inside the hollow rotating through axis of the device.

This utility model is a device for mixing liquids and solids in vessels equipped with a conical section, including a device body containing an electric motor and a gear mechanism for driving an axis with a clamp and a separate block for turning on and controlling the rotation of the electric motor, characterized in that the device body contains an additional adapter , designed to be placed in a conical section, while the specified adapter is provided with a hole through which an axis passes, equipped with blades for mixing the contents of the vessel.

In a preferred embodiment, the clamp is a collet clamp.

This utility model is an improved device for mixing liquids in chemical vessels equipped with a conical section. A significant design innovation that facilitates user operation is the ability to quickly mount the stirrer in chemical glassware with a standard conical ground. At the same time, it is possible to bypass the operations typical for the device of overhead stirrers: separate mounting of the mass transfer device on a stand, alignment of its axis with the adapter of the chemical reactor section, selection of such an adapter. The essence of the proposed device lies in the fact that the body of the stirrer device is installed directly into the reactor by fixing it on a grinding joint. At the same time, an inert guiding axis-adapter is integrated into the design of the mixer into the reactor section, similar in functionality to the existing locking and locking mechanisms for mechanical mixing of reaction mixtures. An essential detail of the proposed design is also a quick-release connection of the rotating axis-mount with a mixing element, which allows you to quickly adjust the working device to a specific chemical vessel. Also, easy adjustment for a specific laboratory vessel is provided by a replaceable conical adapter of the stirrer in a section, which allows you to install the proposed design in dishes with any standard conical section. It is possible to manufacture an adapter of any, including a non-standard shape for use in specific tasks. The body of the device, in which the electric motor and the gear mechanism of the axle drive with a clamp (preferably collet, but not limited to), are placed, is equipped with an integrated or separate unit for turning on and controlling the rotation of the electric motor. The design allows you to add the stirrer with: quick replacement of adapters in thin sections, adjustable sealing ring for the axis of the mixing element, additional fastening elements on glass or a tripod, speed sensor and excess mixing resistance, etc. The device is optimal for use with cookware equipped with a standard conical grind, but is not limited to such use. So, the device is equipped with a special groove for installation in the tripod sleeve, which makes it universal, suitable for mixing in glasses and other devices without standard connections.

Simplify and become safe during the reaction operations associated with changing the position of the flask: tilting, raising and lowering the device. The use of classic versions of overhead stirrers, on the contrary, does not imply moving the reaction vessel without at least partial dismantling of the system. The use of this model, therefore, facilitates and speeds up the operations of introducing the reaction vessel into cooling mixtures, onto heating devices, allows you to transfer the vessel with a connected stirrer, and so on, and reduces the risk of breakage of laboratory glassware and accidents during these operations.

This approach makes it possible to abandon the flexible attachment (flexible coupling) of the stirrer shaft and reduce vibrations that occur when using an overhead stirrer, when using which it is necessary to achieve alignment of the stirrer drive and the neck of the flask. Accordingly, the load on the chemical vessel and the entire structure is reduced. The drive of the mixing element occurs through the transfer of motion from the built-in electric motor to an additional hollow axis, into which this element is clamped. The hollow axis, stirring element aligns with the built-in inert adapter in a conical section, which is fixed directly into the chemical reaction vessel. In this way, a quick installation of the overhead stirrer is achieved, which is not inferior in ease to the magnetic version, with all the advantages of mechanical stirring at the moment of rotation. It is proposed to use a gear transmission of motion from an electric motor to a movable axle, a collet clamp of a mixing element in a hollow axis, a Teflon adapter into a vessel and an external control unit for one or more mixers, however, the formula also suggests other options for implementing the main design, both in terms of the type of motion transmission, and and by types of installation of electrical equipment and types of clamps. The following terms are used in the description and claims of the utility model:

Collet clamp - a device for fixing parts of a cylindrical or prismatic shape. Collets are springy split sleeves with three to six petals, installed in a special cartridge.

Conical holder (adapter) - a core of a truncated conical shape with a central hole for installation in standard necks of reaction vessels of the axis of the stirring element and an upper threaded connection for quick installation (twisting) into the stirrer body and changing to a specific chemical vessel. Also serves to tighten the O-ring and seal the joint.

Hollow axle - an internal element of the agitator design, which serves to transmit rotation to the agitating element from the motor by means of a mechanical transmission, while the agitating element is connected to the hollow axis with a quick-release connection and can be easily mounted or removed. The hollow axle is a hollow cylinder on which a clamp for the stirring element is fixed so that the clamp is accessible to the stirrer operator. Also on this hollow cylinder is fixed a mechanical transmission element (or it is driven by interaction with it, or is built into the hollow axis of the electric motor) to transfer rotation to the mixing element.

The mixing element is an axial dynamic vane pump, the movement of the working medium in which occurs in a continuous flow due to the interaction of this flow with the movable rotating rotor blades and the fixed housing blades. In this case, the portable movement of the working fluid proceeds in the axial direction, that is, parallel to the axis of rotation of the rotor.

Brief description of the drawings

Fig. 1 - Diagram of a stirrer according to the present utility model. The following components are marked on the drawing 1 - Agitator housing; 2 - Reducer housing, 3 - Motor protection housing, 4 - Screw, 5 - Collet, 6 - Collet nut, 7 - Interchangeable conical adapter.

Fig. 2 - Photo of the utility model.

Implementation of the utility model

A device for mixing liquids, a laboratory top-drive stirrer, a distinctive feature of which is the ability to quickly install the device directly into the flask section, which distinguishes this device from analogues that require separate mounting on a tripod with subsequent alignment of the flask section and the stirrer axis. The stirrer consists of the following blocks: a) the stirrer itself (standard sample); b) a movable axis with a clamp (for example, a collet), into which the stirrer a is inserted and fixed at the desired height relative to the laboratory instrument; c) a chemically inert adapter that is inserted into the thin section of the flask (for example, a PTFE core), which ensures the tightness of the connection and at the same time is directly connected to the stirrer body; d) the body of the agitator, on which the electric motor is mounted (or the motor is placed in the control unit and connected to the body by a flexible transmission) and the transmission mechanism that drives the axis 6 and the agitator a; e) electronic engine control unit. At the same time, the device allows you to fix the stirrer a in axis 6 at an arbitrary height, which makes it universal for various laboratory instruments, and it also provides for changing the adapter for standard chemical instruments.

For the technical implementation of the features of the proposed model, the problems of coaxial placement of moving and fixed parts of the structure are solved. The fixed parts - an inert adapter with a hermetic seal, a stirrer body - are placed on an axis driven by an electric motor through a hollow axis transmission with a clamp, into which, in turn, the mixing element is inserted directly.

Example.

Weight:

- proposed model. Stirrer with adapter - 590 g, acceptable with a margin for installation in a thin section of the flask. Separate control box - 175 g.

- the closest commercial analogue, a laboratory overhead mechanical stirrer of the basic configuration - from 1500 g (there are analogues of a smaller mass,

from 800 g, but they do not correspond to the proposed model in terms of torque parameters).

Rotational moment:

- the proposed model - maximum torque - 12.7 N⋅cm moment with a locked rotor - 30 N⋅cm;

- commercial closest analogue: with a locked rotor - 30 N⋅cm

RPM range:

- the proposed model - 0-1270 rpm;

- commercial closest analogue: 0-2000 rpm.

Measurements:

- proposed model, mixer assembly: 70×110×50, mixer without adapter and motor: 50×60×50 (the main mechanical part of the device is extremely ergonomic);

- commercial closest analogue: stirrer body 193×70×154, however, the device requires assembly as part of a much larger system with a powerful stand and a separate fixation of this stirrer from the laboratory setup.

For comparison, a modern analogue is taken - IKA Ministar 20 control. Old IKAs have a mass of 2800 g+ with large dimensions. Products from Heidolph and other major manufacturers have similar parameters.

Claims (1)

A device for mixing liquids and bulk solids in vessels equipped with a conical section, including a device body containing an electric motor and a gear drive mechanism for an axis with a clamp and an integrated block for turning on and controlling the rotation of the electric motor, characterized in that the device body contains an adapter designed to be placed in a conical a thin section, while the specified adapter is provided with a hole through which an axis passes, provided with blades for mixing the contents of the vessel.

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