JP2018204482A - Solution transfer device - Google Patents

Abstract

To provide a solution transfer device capable of preventing a solid material from being accumulated onto a sliding part of a pump mechanism which is shaft-sealed such that solution does not get into a gap between a cylinder and a piston, and has such the pump mechanism as to suck and eject the solution in accordance with motion of the piston sliding in the cylinder.SOLUTION: A solution transfer device includes: a pump mechanism main body which is shaft-sealed such that solution does not get into a gap between a cylinder and a piston, and sucks and ejects the solution in accordance with motion of the piston sliding in the cylinder; and purge gas charging means which is provided on an outer part of the pump mechanism main body and charges purge gas into the gap between the cylinder and the piston. Therein, solvent charging means is provided on an outer part of the pump mechanism main body, a solvent charging tube of the solvent charging means is fluidically connected with a purge gas charging tube of the purge gas charging means, and solvent is charged into the gap between the cylinder and the piston at the same time with the purge gas or intermittently.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a solution transfer device for transferring a solution in which a solid easily precipitates, and more particularly to a solution transfer device provided with a mechanism for preventing sticking of a sliding portion of a pump having a shaft seal device.

  The conventional solution transfer device using a pump, particularly when transferring a solution in which solid matter is likely to precipitate, causes the solid matter to precipitate from the solution that has entered the gap between the piston and the cylinder, that is, the sliding portion. The sliding resistance increases by adhering to the piston, and in the worst case, an event may occur in which the piston and the cylinder are fixed.

  Such an event occurs in common with various pumps. Conventionally, as a typical solution, a purge gas injection passage is provided in the pump sliding portion, and a purge gas such as nitrogen gas is constantly or periodically provided therefrom. To prevent the solid matter from adhering to the pump sliding portion (see Patent Document 1).

JP 2002-013645 A

  For example, in an IS process composed of three chemical reaction steps: a Bunsen reaction (a reaction for producing sulfuric acid and hydrogen iodide), a thermal decomposition reaction of sulfuric acid, and a thermal decomposition reaction of hydrogen iodide, polyhydroiodic acid (HIx solution: When a mixture of hydrogen iodide, iodine, and water is transferred, an environment in which solid iodine is likely to precipitate is generated depending on temperature and concentration. For this reason, when transferring such a solution, solid iodine may precipitate from the solution that has entered the sliding portion of the pump mechanism body, and the solution transfer pump may be stopped. Further, since the leaked matter has a high vapor pressure, it also penetrates and accumulates in the coupling portion, which may cause the coupling to become dirty or corroded.

  In the purge gas injection to the pump sliding part, which has been used conventionally, the amount of solution leakage from the shaft seal part can be reduced, but it is not possible to completely prevent the solution from entering the pump sliding part, Depending on the solution composition, hydrogen iodide volatilizes, so that the solubility of solid matter (iodine) in the solution is lowered, and there is a big problem that accumulation of the solid matter on the pump sliding portion is promoted.

  Accordingly, an object of the present invention is to provide a solution transfer device capable of preventing accumulation of solid matter on a sliding portion of a pump mechanism body that sucks and discharges a solution by movement of a piston sliding in a cylinder.

  Still another object of the present invention is to prevent solids from accumulating on the sliding portion as described above, and that the volatile components of the transfer solution leaking through the shaft seal portion of the pump mechanism are components outside the pump mechanism main body. An object of the present invention is to provide a solution transfer device capable of preventing sticking to the liquid.

  In order to achieve the above object, a solution transfer device according to one aspect of the present invention is a shaft seal that prevents a solution from entering a gap between a cylinder and a piston, and the solution is moved by the movement of the piston that slides in the cylinder. A pump mechanism body for suction and discharge; and a solution transfer device provided outside the pump mechanism body and having purge gas injection means for injecting purge gas into the gap between the cylinder and the piston. Provided with a solvent injection means, the solvent injection pipe of the solvent injection means is fluidly connected to the purge gas injection pipe of the purge gas injection means, and the solvent is introduced into the gap between the cylinder and the piston simultaneously or intermittently with the purge gas. I try to inject.

  Preferably, the above-described solution transfer device is further provided with a heater for heating the pump head portion of the pump mechanism main body so as to prevent solid matter from being precipitated in the pump head portion.

  Further, the solution transfer device according to another aspect of the present invention is configured such that the shaft is sealed so that the solution does not enter the gap between the cylinder and the piston, and the inside of the cylinder is driven by the power from the motor transmitted through the coupling means. A pump mechanism body that sucks and discharges a solution by the movement of the sliding piston, and a solution transfer unit that is provided outside the pump mechanism body and includes a purge gas injection unit that injects a purge gas into a gap between the cylinder and the piston. An apparatus is provided with a solvent injection means outside the pump mechanism main body, and a solvent injection pipe of the solvent injection means is fluidly connected to a purge gas injection pipe of the purge gas injection means, and the solvent is simultaneously used with the purge gas. Alternatively, the coupling means and the pump are configured to intermittently inject into the gap between the cylinder and the piston. During 構本 body is provided with a suction means for sucking the volatile components of the solution leaking from the pump mechanism body.

  According to the present invention, in a solution transfer device having a sliding portion, even if a small amount of the transfer solution leaks into the shaft-sealed sliding portion, a solvent having an action of dissolving the solid matter formed thereby (for example, , Hydriodic acid) is injected, so that solid matter (for example, iodine) is dissolved and absorbed, and sticking of the sliding portion is prevented. Further, since the conventional purge gas is used in combination, the solvent can be immediately discharged, and the amount of the solvent leaked from the upper shaft seal opening of the pump mechanism main body is extremely reduced.

The schematic diagram explaining the solid substance formation by the solution component in a conventional apparatus. The schematic diagram which shows schematic structure of the conventional apparatus which introduce | transduces purge gas. The schematic diagram which shows the structure of one Example of this invention with a solvent injection | pouring means. The schematic diagram which shows the structure of the other Example of this invention which has a heating means of a pump head part. The schematic diagram which shows the structure of the further another Example of this invention with the inhalation means of a solution volatile component. The schematic diagram which shows the structure of the further another Example of this invention which provided the baffle plate. The schematic diagram which shows the further another Example of this invention provided with two gas passages.

  First, in order to help understanding of the present invention, the prior art described above will be briefly described with reference to the drawings. FIG. 1 is a diagram schematically illustrating the formation of solids by solution components in a conventional apparatus, and FIG. 2 is an outline of the conventional apparatus in which a purge gas is introduced as shown in the aforementioned patent document. It is a figure which shows the structure typically.

  In FIG. 1, reference numeral 10 denotes a pump mechanism main body, and the solution 1 to be transferred is sucked into the pump mechanism main body 10 by the reciprocating motion of the piston 11 and discharged. In FIG. 1, the gap between the piston 11 and the cylinder 12 is drawn to be extremely wider than usual for the sake of explanation. A shaft sealing mechanism 13 is provided so that the transfer solution 1 does not enter the gap. However, in reality, the extremely minute solution 1 enters the gap through the shaft sealing mechanism 13. The temperature of the solution that has entered decreases as it goes upward, and solid matter is deposited on the wall surfaces of the piston 11 and the cylinder 12, and if nothing is done, the sliding resistance increases remarkably, making sliding difficult. .

  Therefore, as shown in FIG. 2, a purge gas injection pipe 2 is provided to inject purge gas into the gap constantly or periodically, and the invading solution is discharged outside through the gap between the piston 11 and the cylinder 12. Like to do. However, the solution adhering to the wall surfaces of the piston 11 and the cylinder 12 evaporates the volatile components by the purge gas, and the solid matter is liable to precipitate, the sliding resistance is remarkably increased, and the sliding becomes difficult.

  Hereinafter, the present invention will be described in detail with reference to FIGS. FIG. 3 schematically shows a configuration of an embodiment of the present invention in which a solvent injection means 22 is newly provided in addition to the conventional purge gas injection means 21. The solvent injected from the solvent injection means 22 naturally varies depending on the type of the transfer solution 1. When the transfer solution 1 is a polyhydrogen iodide (HIx) solution (a mixture of hydrogen iodide, iodine and water) used in the IS process, hydroiodic acid which is a mixture of hydrogen iodide and water capable of dissolving iodine. It is. The injection tube from the solvent injection means 22 is fluidly connected to the conventional injection pipe from the purge gas injection means 21. In this embodiment, nitrogen gas (N2) is used as the purge gas, but other inert gas may be used. Further, in order to reduce the penetration of the transfer solution 1 into the gap, it is preferable to inject the purge gas and the solvent while being pressurized to some extent.

  In this solvent transfer device, the purge gas injection means 21 and the solvent injection means 22 are operated simultaneously with the start of the transfer, so that the solution 1 that has entered the gap between the piston 11 and the cylinder 12 and the fixed matter dissolved by the solvent together with the purge gas. Since it is discharged, sticking of the sliding portion is completely prevented.

  It is preferable to warm the pump mechanism body 10 to some extent so that the solution 1 that has entered the gap between the piston 11 and the cylinder 12 does not precipitate on the wall surfaces of the piston 11 and the cylinder 12. FIG. 4 shows the configuration of another embodiment of the present invention having a pump head heating means. In the embodiment of FIG. 4, the heating means is composed of only the heater 30 and the heater power supply 31. The heater 30 must be capable of heating the wall surfaces of the piston 11 and the cylinder 12 to a temperature higher than the precipitation temperature of solid matter. For example, when the transfer solution 1 is polyhydroiodic acid, it is necessary to heat the above-mentioned wall surface more than solubility. Depending on the type of the transfer solution 1, it is not necessary to install a heater as shown in FIG. 4 by heating the transfer solution 1 to a certain temperature.

  An appropriate shaft sealing means such as a labyrinth is provided in the gap between the piston 11 and the cylinder 12, but since the volatile component of the solution has a high vapor pressure, it passes through this and adheres to the member at the top of the pump mechanism main body. There is a risk of doing. In order to prevent such an event, in a further embodiment of the present invention, means for sucking and recovering volatile components escaping above the pump mechanism body 10 is provided. An example of this is shown in FIG.

  In FIG. 5, reference numeral 40 denotes a volatile component suction means. The suction means 40 is a general suction pump that is resistant to leakage. By operating this suction pump (not shown) at the start of the transfer of the solution 1, most of the volatile components that have passed through the shaft sealing means can be sucked, so that the volatile components are each component above the pump mechanism body 10. Can be prevented.

  FIG. 6 schematically shows the configuration of still another embodiment of the present invention that can be applied to any type of transfer solution 1. In this embodiment, in addition to the purge gas injection means 21, the solvent injection means 22, the heating means 30, and the volatile component suction means 40 so far, a baffle plate 50 is further provided. The baffle plate 50 is made of a fluororesin plate and is attached directly below the coupling 15. By providing the baffle plate 50, it is possible to prevent volatile components that could not be sucked by the volatile component suction means 40 from adhering to the lower surface of the coupling 15 just above the gap between the piston 11 and the cylinder 12.

  In the embodiment described above, the apparatus in which the piston slides up and down in the cylinder has been described as an example. However, it is apparent that the present invention can be applied to a solution transfer apparatus of a type that rotates and slides in principle. Further, the above embodiment shows a typical configuration example and is not limited to this. For example, in the above embodiment, the purge gas supply means 21 and the solvent supply means 22 are shown as separate structures, but they may be configured as a single unit. Further, in the above description, the pipes from the purge gas supply means 21 and the solvent supply means 22 are connected to form a single pipe, and both gases are mixed and supplied to the solution transfer apparatus 10, but as shown in FIG. In addition, both gases may be supplied to the solution transfer apparatus 10 via separate pipes.

1 ... Transfer solution
2… Purge gas injection pipe
10 ... Pump mechanism body
11 ... Piston
12 ... Cylinder
13 ... Shaft seal mechanism
14 ... Motor
15 ... Coupling
21 ... Purge gas injection means
22 ... Solvent injection means
30 ... Heater
35 ... Power supply for heater
100 ... Solid matter
101… Volatile component

Claims (5)

The shaft is sealed so that the solution does not enter the gap between the cylinder and the piston, and the pump mechanism body that sucks and discharges the solution by the movement of the piston sliding inside the cylinder, and is provided outside the pump mechanism body, In the solution transfer apparatus comprising purge gas injection means for injecting purge gas into the gap between the cylinder and the piston,
Solvent injection means is provided outside the pump mechanism body, a solvent injection pipe of the solvent injection means is fluidly connected to a purge gas injection pipe of the purge gas injection means, and the solvent is simultaneously or intermittently supplied with the purge gas. A solution transfer device characterized by being injected into a gap between a cylinder and a piston.   The solution transfer device according to claim 1, further comprising a heater for heating a pump head portion of the pump mechanism body to prevent precipitation of solid matter in the pump head portion. Solution transfer device. The solution is sucked and discharged by the movement of the piston that slides in the cylinder by the power from the motor, which is sealed so that the solution does not enter the gap between the cylinder and the piston, and is transmitted through the coupling means. In the solution transfer apparatus comprising a pump mechanism main body and a purge gas injection means provided outside the pump mechanism main body and injecting a purge gas into the gap between the cylinder and the piston,
Solvent injection means is provided outside the pump mechanism, a solvent injection pipe of the solvent injection means is fluidly connected to a purge gas injection pipe of the purge gas injection means, and the solvent is simultaneously or intermittently supplied to the cylinder with the purge gas. And is configured to be injected into the gap between the piston and
A solution transfer apparatus comprising a suction means for sucking a volatile component of the solution leaking from the pump mechanism body between the coupling means and the pump mechanism body.   4. The solution transfer device according to claim 3, further comprising a heater for heating the pump head portion of the pump mechanism body to prevent precipitation of solid matter in the pump head portion. Solution transfer device.   5. The solution transfer device according to claim 3, further comprising a baffle plate directly under the coupling means so that a volatile component of the solution does not adhere to the coupling means. .

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