JPH0634701U - Concentrated liquid recovery structure in thin film vacuum evaporator - Google Patents

Abstract

(57) [Summary] [Purpose] By changing the recovery path of the concentrated liquid, the bypass pipe is abolished, thereby preventing accidental contact with the evaporation surface. [Structure] The concentrated liquid recovery structure 20 of the present invention is applied to a centrifugal thin-film vacuum evaporation apparatus 1 formed by continuously forming a plurality of evaporation surfaces 11 in the front-rear direction, and the vicinity of the outermost peripheral portion of the evaporation surface 11 on the front side A liquid collecting groove 21 is provided in the liquid collecting groove 21, and the tip of the pairing tube 18 faces the liquid collecting groove 21.
A discharge port 22 is provided at the boundary portion on the outermost peripheral side, and the discharge port 22 and the liquid collection groove 21 are connected by a communication passage 23.

Description

[Detailed description of the device]

[0001]

[The purpose of the device] [Industrial applications]

 The present invention relates to a centrifugal thin-film vacuum evaporation device suitable for heating at high temperature in a short time at a heating operation such as evaporation and concentration of a substance which is susceptible to thermal denaturation. The present invention relates to a concentrated liquid recovery path structure applied to a thin film vacuum evaporation apparatus formed by continuously forming a thin film.

[0002]

[Background of device]

 Centrifugal thin-film vacuum evaporators, which can perform heating operations such as evaporation and concentration of substances that are susceptible to thermal denaturation by applying a predetermined amount of heat at low temperature for a short time, evaporate to increase the processing efficiency. As one having a plurality of surfaces, there is a structure shown in FIG. As shown in FIG. 4, this is composed of a plurality of evaporating surfaces 11 'continuously formed in a bellows shape in the front-rear direction, and further inside thereof, the outermost periphery of the evaporating surfaces 11' having two surfaces on the inner side. A bypass pipe B that connects the side boundary portion to the innermost peripheral portion of the front side evaporation surface is provided, and the pairing tube 18 ′ faces the outermost peripheral portion of the front side evaporation surface 11 ′. ing.

When the raw material liquid is supplied to such a thin film vacuum evaporation apparatus 1 ′, the raw material liquid is transmitted to each evaporation surface 11 ′ as shown by an arrow in FIG. It moves to the outermost part while being concentrated. Then, the concentrated liquid that has reached the outermost peripheral side boundary portion of the two evaporation surfaces 11 ′ on the back side is once collected in the bypass pipe B and supplied to the innermost peripheral portion of the front side evaporation surface 11 ′. . Then, the concentrated liquid supplied to the innermost peripheral portion of the front side evaporation surface 11 'travels along the evaporation surface 11' and reaches the outermost peripheral portion of the evaporation surface 11 'by centrifugal force while being further concentrated. It is collected by the facing pairing tube 18 'and discharged to the outside of the device.

However, in this structure, the presence of the bypass pipe B is indispensable, and in order to support the bypass pipe B located on the inner side of the apparatus, the rotor 4'is passed from near the center of the rotor 4'to the rotor. There is no supporting method other than fixing by the supporting rod C reaching the inside. Further, as shown in FIG. 4 (b), the bypass pipe B receives a large tangential torque at the tip of the bypass pipe B due to the viscous resistance of the concentrated liquid. When the liquid has a large flow rate, the bypass pipe B may be twisted together with the support rod C and may be flexibly deformed, so that the tip portion of the bypass pipe B may come into contact with the evaporation surface 11 ′. Therefore, in the thin film vacuum evaporation apparatus 1'having such a structure, it is necessary to firmly fix the bypass pipe B and the supporting rod C supporting the bypass pipe B, but a narrow space near the center of the rotor 4'is required. There is a limit to the strength of the structure due to the difficulty of installing the reinforcing member.

[0005]

[Technical items we tried to develop]

 The present invention has been made in view of such a background, and by changing the recovery path of the concentrated liquid, the bypass pipe is abolished, and in a new thin film vacuum evaporation device avoiding the risk of contact with the rotor. This is an attempt to develop a concentrated liquid recovery structure.

[0006]

[Constitution of device] [Means for achieving the purpose]

 That is, the concentrated liquid recovery structure in the thin film vacuum evaporator devised in the first aspect of the present application comprises a substantially cylindrical rotor inside the casing, and inside this rotor, a plurality of evaporation surfaces are continuously arranged in the front-rear direction. In addition, the tip of the raw material liquid supply pipe is exposed near the innermost periphery of these evaporation surfaces, and the pairing tube for discharging the concentrated liquid is disposed near the outermost circumference of the foremost evaporation surface. In a thin film vacuum evaporation device consisting of a single unit, a liquid collection groove for collecting the concentrated liquid is provided in the vicinity of the outermost peripheral portion of the foremost evaporation surface, and the pairing tube has a tip for the liquid collection groove. On the other hand, a discharge port for discharging the concentrated liquid to the outside is provided at the boundary portion on the outermost peripheral side of the evaporation surface continuous in the front-rear direction, and this discharge port and the liquid collection groove are connected by a communication passage. Is characterized by It is intended.

In addition to the above requirements, the concentrated liquid recovery structure in the thin film vacuum evaporation apparatus according to the second invention of the present application is such that the communication passage is inclined so as to expand outward from the inner side to the front side of the rotor. It is characterized by being provided as. These ideas are intended to achieve the above object.

[0008]

[Function of the device]

 First, in the first invention according to the present application, since the discharge port is provided at the boundary portion on the outermost peripheral side of the continuously formed evaporation surface, the raw material liquid supplied into the rotor is rotated by the rotation of the rotor. Due to the centrifugal force generated, it moves while being concentrated on the evaporation surface, reaches the discharge port, is discharged to the outside as it is, and is discharged to the outside of the device through the collection passage and the pairing tube through the communication passage outside the evaporation surface. It

In the second invention according to the present application, since the communication passage is provided so as to be inclined outward from the back side of the rotor toward the front side, the concentrated passage discharged to the outside through the discharge port. The liquid moves in the communication passage toward the front side of the rotor due to the centrifugal force generated by the rotation of the rotor.

[0010]

【Example】

 The concentrated liquid recovery structure in the thin film vacuum evaporation apparatus of the present invention will be specifically described below with reference to the drawings. Regarding the order of the description, first, the outline of the thin film vacuum evaporation apparatus 1 to which the present invention is applied will be described, followed by the structural explanation and the operation state explanation of the concentrated liquid recovery structure of the present invention, and finally the others. Examples of

The thin film vacuum evaporation apparatus 1 to which the present invention is applied is a centrifugal thin film vacuum evaporation apparatus that evaporates and concentrates the raw material supplied into the rotor by utilizing the centrifugal force of the rotor rotating at high speed. It is a type that is formed by continuously forming a plurality of evaporation surfaces inside the rotor. The structure is composed of a device body 2 in which a cylinder is laid down sideways and peripheral members connected to the device body 2. The apparatus main body 2 is composed of a casing 3 having a substantially outer shape and a substantially cylindrical rotor 4, of which the casing 3 is provided with a monitoring window 5 on the front side so that the inside can be observed. A steam exhaust pipe 6 is formed behind the casing 3.

The rotor 4 is integrally provided with a rotary shaft 9 connected to the output shaft of the motor M. Inside the rotor 4 having a substantially cylindrical shape, as shown in FIG. A plurality of evaporation surfaces 11 are formed in a bellows shape, and an outer cover plate 12 is provided outside the evaporation surfaces 11. A space is formed between the evaporation surface 11 and the outer cover plate 12, and this space is used as a heating unit 13. A condensate recovery pipe 16 is provided in the heating portion 13 behind the evaporation surface 11 on the innermost side, with its tip facing the outermost peripheral portion of the heating portion 13, and inside the heating portion 13. The supplied steam is condensed due to heat exchange on the evaporation surface 11, becomes water liquid, and is sent to the outermost peripheral portion of the heating unit 13 by the centrifugal force accompanying the rotation of the rotor 4, and is externally supplied by the condensate recovery pipe 16 to the outside. It is configured to be discharged to.

A raw material liquid supply pipe 17 is provided from the outside of the casing 3 to the inside of the rotor 4, and its tip faces the vicinity of the innermost peripheral portion of each evaporation surface 11. In the vicinity of the outermost peripheral portion of the foremost evaporation surface 11, there is provided a collecting groove 21 which is one component of a concentrated liquid recovery structure 20 of the present invention described later, and the concentrated liquid is supplied to the collecting groove 21. The front end of the pairing tube 18 that discharges the gas is exposed.

The concentrated liquid is recovered from the pairing tube 18 because the concentrated liquid has an acceleration of 200 times gravity as an example in the tangential direction due to the centrifugal force generated by the rotation of the rotor 4. And the natural flow into the pairing tube 18.

The concentrated liquid recovery structure 20 of the present invention is provided between the liquid collection groove 21 and the discharge port 22 provided at the boundary portion on the outermost peripheral side of the adjacent evaporation surfaces 11 and includes them. And a communication passage 23 connecting them to each other. Of these, as shown in FIG. 2, the discharge ports 22 are provided at four places with respect to one boundary part, and further outside the discharge ports 22, in front of the root of the outer cover plate 12 and the inner side. A peripheral body plate 24 is provided so as to expand outward and taper.

The peripheral body plate 24 constitutes the communication passage 23, and the end portion on the front side is further bent inward in a “F” shape. The bent portion is the liquid collection groove 21.

When the raw material liquid is supplied to such a thin film vacuum evaporation apparatus 1, the raw material liquid is first sent to the vicinity of the innermost peripheral portion of the evaporation surface 11 by the raw material liquid supply pipe 17. Then, the raw material liquid moves on the evaporation surface 11 toward the outermost peripheral portion of the evaporation surface 11 due to the centrifugal force generated by the rotation of the rotor 4. At this time, the raw material liquid is concentrated by the action of the evaporation surface 11 and moves as a concentrated liquid.

Even after the concentrated liquid reaches the outermost peripheral portion of the evaporation surface 11, the concentrated liquid tries to move further outward due to the centrifugal force caused by the rotation of the rotor 4, and therefore passes through the discharge port 22. Reaches the inner peripheral surface of the peripheral body plate 24. Then, the concentrated liquid which has reached the inner peripheral surface of the peripheral body plate 24 is propagated through the inner peripheral surface of the taper shape which spreads outward due to the centrifugal force accompanying the rotation of the rotor 4, and is collected in the liquid collecting groove 21 at the tip thereof to form a pair. It is discharged to the outside of the device by the ring tube 18.

Next, another embodiment of the concentration and recovery structure 20 of the present invention will be described with reference to FIG. That is, the embodiment shown in FIG. 3 differs from the embodiment shown in FIGS. Specifically, each discharge port 22 is connected to a connecting pipe 25 which is provided in a tapered shape so that the concentrated liquid reaching the discharge port 22 is the same as the peripheral body plate 24 in the embodiment shown in FIGS. By this action, the inside of the connecting pipe 25 is moved toward the front of the rotor 4.

[0020]

[Effect of device]

 The concentrated liquid recovery structure 20 of the present invention has the structure described above, and by having such a structure, the following effects are exhibited. First, in the first invention according to the present application, the discharge port 22 is provided at the boundary portion on the outermost peripheral side of the evaporation surface 11 that is continuously formed, whereby the communication passage 23 for the concentrated liquid is provided outside the evaporation surface 11. Has been. Therefore, it is not necessary to provide the bypass pipe B as shown in FIG. 4 inside the evaporation surface 11, and it is not necessary to pay attention to the reinforcement of the support rod C required when the bypass pipe B is provided. As a result, the number of revolutions of the rotor 4 can be increased and the flow rate of the concentrated liquid can be increased, so that large-scale concentration can be performed.

Further, in the second invention according to the present application, the communication passage 23 is provided in a taper shape that expands outward. Therefore, the concentrated liquid discharged from the discharge port 22 into the communication passage 23 by the centrifugal force caused by the rotation of the rotor 4 moves to the front liquid collecting groove 21 side by the action of the centrifugal force without providing a separate transfer means. is there. Therefore, this point also contributes to simplification and weight reduction of the mechanism.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an apparatus main body section in a thin film vacuum evaporation apparatus to which the present invention is applied.

FIG. 2 is a skeletal transverse sectional view of the same.

FIG. 3 is a skeletal vertical sectional side view showing another embodiment of the same.

FIG. 4 is a skeletal vertical sectional side view showing a conventional concentrated liquid recovery structure and an explanatory view showing its problems.

[Explanation of symbols]

 1 Thin Film Vacuum Evaporator 2 Device Main Body 3 Casing 4 Rotor 5 Monitoring Window 6 Steam Exhaust Pipe 9 Rotating Shaft 11 Evaporation Surface 12 Outer Cover Plate 13 Heating Part 16 Condensate Recovery Pipe 17 Raw Material Liquid Supply Pipe 18 Pairing Tube 20 Concentrated Liquid Recovery Structure 21 Liquid collecting groove 22 Discharge port 23 Communication passage 24 Circumferential body plate 25 Communication pipe B Bypass pipe C Support rod M Motor

Claims (2)

[Scope of utility model registration request] 1. A substantially cylindrical rotor is provided inside a casing, and a plurality of evaporation surfaces are formed continuously in the front-rear direction inside the rotor, and a raw material is provided in the vicinity of the innermost peripheral portion of these evaporation surfaces. In a thin-film vacuum evaporation system in which the tip of the liquid supply pipe is faced and a pairing tube for discharging the concentrated liquid is faced in the vicinity of the outermost periphery of the foremost evaporation surface, the evaporation surface of the foremost evaporation surface is A liquid collecting groove for collecting the concentrated liquid is provided near the outermost peripheral portion, and the pairing tube has its tip facing the liquid collecting groove, while the outermost peripheral portion of the evaporation surface continuous in the front-rear direction. A concentrated liquid recovery structure in a thin film vacuum evaporation device, characterized in that a discharge port for discharging the concentrated liquid to the outside is provided at the side boundary portion, and the discharge port and the liquid collection groove are connected by a communication passage. . 2. The concentrated liquid recovery structure in the thin film vacuum evaporator according to claim 1, wherein the communication passage is provided so as to be inclined outward from the inner side of the rotor toward the front side thereof. .