JP2590568Y2 - Structure for preventing scattering of raw material liquid in thin film vacuum evaporator - Google Patents

Description

[Detailed description of the invention]

[0001]

[Purpose of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal thin-film vacuum evaporator suitable for performing a heating operation such as evaporation and concentration of a substance susceptible to thermal denaturation at a low temperature in a short time. The present invention relates to a structure of a pipe for supplying to a pipe.

[0002]

BACKGROUND OF THE INVENTION In a heating operation such as evaporation and concentration of a substance which is susceptible to thermal denaturation, it is necessary to perform a desired operation by applying a predetermined amount of heat at a low temperature in a short time. Therefore, today, a centrifugal thin-film vacuum evaporator is used to perform such an operation, and in particular, an apparatus as shown in FIG. 8 is widely used. This device comprises a conical rotator 4 'having a rotation axis 9' inside a substantially cylindrical outer shell member 3 ', and an evaporating surface 11' is formed on the inner front side of the rotator 4 '. On the back side, a heating section 13 'for forming an evaporation is formed. A tip of a raw material supply pipe 17 'for supplying the raw material faces near the rotating shaft 9' of the evaporation surface 11 ', while a pair for collecting the concentrated liquid is provided near the outermost periphery of the evaporation surface 11'. A ring tube 18 'is facing.

In such a centrifugal thin-film vacuum evaporator, when a raw material liquid having a strong foaming property is to be supplied to the evaporation surface 11 ', the raw material liquid is foamed as soon as it comes out of the raw material liquid supply pipe 17', and the evaporation surface 11 ''It is scattered by the vapor flow of the vapor evaporated from, and flows out to the distillate side. In this case, in a large-sized apparatus, a distributor D is provided so as to surround a supply section of the raw material liquid as shown in FIG. 8, so that the foamed raw material liquid can be prevented from scattering. However, in a small-sized apparatus, there is no space. It is impossible to provide such a distributor, and even if a distributor is provided, the precision is lacking. Therefore, the development of other scattering prevention means has been desired.

[0004]

[Technical matters attempted to be developed] The present invention has been made in view of such a background, and a raw material supply pipe is provided so that even a small thin film vacuum evaporator can effectively prevent scattering of foamed raw material liquid. An attempt was made to improve it.

[0005]

[Structure of the device]

Means for Achieving the Object In the thin film vacuum evaporating apparatus according to the present invention, the material liquid scattering prevention structure comprises a hollow conical rotating body having a rotating shaft inside the outer shell member, and the inside of the rotating body is A thin-film vacuum that forms an evaporation surface and faces the tip of the raw material supply pipe near the rotation axis of the evaporation surface, and faces a pairing tube for discharging concentrated liquid near the outermost periphery of the evaporation surface. The evaporating apparatus is characterized in that a scattering prevention plate is provided in the form of a flange near the tip of the raw material liquid supply pipe, thereby achieving the object.

[0006]

In the present invention, since the scattering prevention plate is provided in the form of a flange near the tip of the raw material liquid supply pipe, the foamed raw material liquid is interrupted by the scattering prevention plate and moves to the evaporation surface without scattering.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the illustrated embodiment. Reference numeral 1 denotes a centrifugal thin-film vacuum evaporator to which the present invention is applied, which is composed of an apparatus main body 2 having a substantially cylindrical shape and a peripheral member connected thereto. The apparatus main body 2 includes an outer shell member 3 having a substantially outer shape and a conical rotating body 4. The outer shell member 3 is provided with a monitoring window 5 so that the inside can be observed, and a steam exhaust pipe 6 is formed on the side of the outer shell member 3. 2 and 4, the steam exhaust pipe 6 is drawn upward from the outer shell member 3, but this is for the sake of convenience for easy understanding of the drawings. The side on which the monitoring window 5 is provided is defined as the front side.

A condenser 7 is provided outside the apparatus main body 2 for cooling the vapor evaporated in the process of concentrating the raw material liquid by the rotating body 4, and the condenser 7 has a vacuum for sucking the vapor. together with the pump P ₁ is provided, distillate tank T ₀ is provided through the centrifugal siphon pump 8 to the outlet side.

Further, the rotating body 4 has a rotating portion 10 having a substantially umbrella-shaped jacket structure formed around a rotating shaft 9 to which the motor M is connected. The rotating part 10 is formed by forming a hollow heating part 13 between an umbrella-shaped evaporation surface 11 formed on the front side and an outer cover plate 12 formed on the rear side. A source liquid supply surface 11 a perpendicular to the rotation axis 9 is formed on the evaporation surface 11. In this embodiment, the plane perpendicular to the rotation axis 9 is the raw material liquid supply surface 11a, but the surface for supplying the raw material liquid is not particularly required to be such a plane.
It may be a part of the evaporation surface 11 or a curved surface.

[0010] where the outer cover plate 12 exits from the outer shell member 3 is provided with a steam supply port 14 for supplying steam into the heating portion 13, the connecting hole 15 for connecting a vacuum pump P ₂ It is formed. The steam is condensed by heat exchange on the evaporation surface, and the condensed water drops move to the outermost periphery of the heating unit 13 by centrifugal force and are discharged from the tip of the condensed liquid recovery pipe 16.

Next, a raw material liquid supply pipe 17 extends from the outside to the inside of the outer shell member 3, and the tip thereof faces the evaporation surface 11 near the rotating shaft 9. And raw material liquid supply pipe 1
7 has a raw material liquid tank T outside the apparatus main body 2.
Connected to _one, the supply pump P ₃ for supplying the raw material liquid to the raw material solution supply pipe 17 side is provided on the way.
A scattering prevention plate S, which is a characteristic configuration of the present invention, is provided near the tip of the raw material liquid supply pipe 17 and at a position slightly inside the tip of the raw material liquid supply pipe 17.

The scattering prevention plate S is connected to the raw material liquid supply pipe 1.
7 is provided in a substantially flange shape,
Its shape is almost rectangular, but its two long sides are
It is curved to match the curvature of. Further, in a state where the raw material liquid supply pipe 17 is set at a predetermined position, the scattering prevention plate S faces so as to be substantially parallel to the raw material liquid supply surface 11a on which the tip of the raw material liquid supply pipe 17 faces,
The distance between the two is set to approximately 8 to 10 mm or less. still,
The distance between the raw material liquid supply surface 11a and the scattering prevention plate S is appropriately determined depending on the type of the raw material liquid.

The scattering prevention plate S is formed in such a manner that the raw material liquid supply pipe 17 is disposed substantially in parallel with the evaporation surface 11 as shown in FIG. In order to provide the scattering prevention plate S in parallel with the raw material liquid supply surface 11a,
7 in FIG.
In the case where the vicinity of the end of the raw material liquid supply pipe 17 is bent as shown in (b) so that the front end faces perpendicularly to the raw material liquid supply surface 11a, the scattering prevention plate S And can be formed vertically. Further, the shape of the scattering prevention plate S may be circular or elliptical depending on the shape of the raw material liquid supply surface 11a, the direction of the raw material liquid supply pipe 17 facing the raw material liquid supply surface 11a, or the like, in addition to the shape as in the embodiment. It may be shaped or rectangular.

In short, the formation form and shape of the scattering prevention plate S are the most efficient for the scattering of the raw material liquid depending on the direction in which the raw material liquid supply pipe 17 faces the raw material liquid supply surface 11a and the form of formation of the raw material liquid supply surface 11a. It is selected so that it can be prevented.

Next, a pairing tube 18 for recovering the concentrated liquid is provided near the outermost peripheral portion of the evaporation surface 11 so that its tip is opened in the tangential direction of the rotation direction of the rotating body 4. And this pairing tube 18 is connected to the concentrate tank T ₂ through the concentrated solution recovery pipe 19 connected thereto, concentrate exhaust pump P ₄ is provided for discharging the concentrated solution in the middle.

The concentrated liquid is recovered from the pairing tube 18 by utilizing the centrifugal force generated by the rotation of the rotating body 4 because the concentrated liquid has a tangential direction, for example, 200 times the acceleration of gravity. This is performed by natural inflow into the pairing tube 18.

The thin-film vacuum evaporator 1 has the above-described structure, and the operation of the device will be described below. First, the motor M is driven to rotate the rotating body 4, and the vacuum pump P ₁ is driven to reduce the pressure in the outer shell member 3, and the cooling water is continuously supplied to the condenser 7. Incidentally, by reducing the pressure in the outer shell member 3, the boiling point of the raw material liquid is lowered, so that the raw material liquid is easily evaporated even at a low temperature. Steam is supplied from the steam supply port 14 to the heating unit 1.
Is supplied to the 3 the evaporation surface 11 and the heating state, whereas previously to allow discharge the condensed water droplets by driving the vacuum pump P _2. Further ready for recovering the concentrated solution to the concentrate collection tank T in ₂ by driving the concentrate exhaust pump P _4.

In this state, the supply pump P ₃ is driven to supply the raw material liquid from the raw material liquid supply pipe 17 onto the evaporation surface 11. As a result, the raw material liquid is pushed and spread on the evaporation surface 11 by centrifugal force due to the rotation of the rotating body 4, and a very thin liquid film of about 0.1 mm flows on the evaporation surface 11. At this time, if the raw material liquid contains protein, saponin, or the like, foaming often occurs when the raw material liquid comes out of the raw material liquid supply pipe 17, but the foamed raw material liquid is blocked by the scattering prevention plate S. It moves onto the evaporation surface 11 without being scattered,
Defoams by the action of centrifugal force.

The liquid film spread on the evaporation surface 11 is
Upon receiving heat from the evaporating surface 11, the concentrated liquid evaporates and reaches the outermost peripheral portion of the evaporating surface 11.
8 is recovered from, and is stored in concentrated solution recovery tank T _2. Note that vapor evaporated by the evaporation surface 11 is accumulated in through the steam exhaust pipe 6 is cooled condensed in condenser 7 distillate tank T _0.

[0020]

[Effects of the Invention] In the present invention, since the scattering prevention plate is provided in the form of a flange near the tip of the raw material liquid supply pipe, even if a highly foamable raw material liquid is supplied from the raw material liquid supply pipe, the foamed raw material is prevented from scattering. It is not scattered by the plate and does not mix with the raw material liquid on the distillate side. Therefore, the concentration of the raw material liquid having a strong foaming property can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a thin-film vacuum evaporator to which the present invention is applied.

FIG. 2 is a side view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a vertical sectional side view of the same.

FIG. 5 is an enlarged front view showing a portion where the anti-scattering plate is attached.

FIG. 6 is an enlarged front view and a side view showing a scattering prevention plate.

FIG. 7 is an explanatory diagram showing an attachment mode of a scattering prevention plate according to a form of a raw material liquid supply pipe.

FIG. 8 is a skeletal side view showing a conventional thin film vacuum evaporation apparatus provided with a raw material liquid scattering prevention structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Thin-film vacuum evaporation apparatus 2 Device main body 3 Outer shell member 4 Rotating body 5 Monitoring window 6 Steam exhaust pipe 7 Condenser 8 Centrifugal siphon pump 9 Rotating shaft 10 Rotating part 11 Evaporation surface 11a Raw material liquid supply surface 12 Outer plate 13 Heating part 14 Steam supply port 15 Connection hole 16 Condensate recovery pipe 17 Raw material supply pipe 18 Pairing tube 19 Concentrate recovery pipe M Motor T ₀ Distillate tank T ₁ Raw material tank T ₂ Concentrate tank P ₁ Vacuum pump P ₂ Vacuum pump P ₃ feed pump P ₄ concentrate exhaust pump S shatterproof plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotary body having a hollow conical shape having a rotation axis inside an outer shell member, an evaporation surface is formed inside the rotation body, and a raw material supply pipe is provided near the rotation axis of the evaporation surface. In a thin-film vacuum evaporator having a front end facing a pairing tube for discharging a concentrated liquid in the vicinity of the outermost periphery of the evaporation surface, a flange-like scattering prevention plate is provided near the front end of the raw material liquid supply pipe. A material liquid scattering prevention structure in a thin-film vacuum evaporator, comprising: