JPH09318255A - Drying and treatment device for water-containing article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent freezing in a simple structure even if this device is set up in cold districts. SOLUTION: This treatment device is provided with a drying tank 4 having a heater 15, an ejector 41 provided on the way of a water circulation return pipeline which circulates the water discharged from the outlet of a storage tank 42 by driving a pump 40 and returns to the inlet of the storage tank 42, a suction pipeline 52 which connects the vacuum opening of the ejector 41 to the exhaust opening of a drying tank 4 and a detector 60 which detects the water temperature in the water circulating pipeline. The air in the drying tank 4 is absorbed with the ejector 41 and the pressure is reduced while the vapor vaporized from the drying article is adapted to join the circulating water with the ejector 41 so as to liquefy the vapor with the circulating water. When a temperature below the specified value is detected, it is so arranged that only the pump 40 may be operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-containing material drying treatment apparatus for efficiently heating and drying water-containing materials such as food waste under reduced pressure.

[0002]

2. Description of the Related Art As a typical conventional water-containing material drying apparatus for efficiently heating and drying an object to be dried under reduced pressure, there is one proposed by the applicant of the present application (Japanese Patent Laid-Open No. 8-3577).
No. 5). This water-containing material drying treatment device is provided with a condenser (liquefier) in the middle of the path connecting the ejector, which is a vacuum generator, and the drying tank, and cools the water vapor evaporated from the material to be dried in the condenser. It is liquefied.

Further, since the liquid liquefied by the condenser often contains a bad odor, in order to remove this bad odor, a deodorizing filter is provided inside a storage tank provided in the middle of the circulation path. Deodorization is performed by repeatedly passing circulating water through.

[0004]

However, in the above-mentioned conventional water-containing material drying treatment apparatus, since cooling water must be continuously supplied to the condenser for liquefying water vapor, a water supply pipe is indispensable. Not only was the structure complicated, but the installation work was also troublesome. In addition, once installed, water piping work had to be performed again, so it was not possible to move easily.

Further, if a structure is adopted in which an ejector is provided in the middle of the water circulation path to generate a vacuum, the water in the circulation path will freeze in a cold region, and the pipe of the circulation path will rupture. May occur.

Further, in order to surely remove the bad smell,
It was necessary to replace the deodorizing filter in the storage tank within a short period of time.

Therefore, an object of the present invention is to provide a water-containing substance drying treatment apparatus which has a simple structure, can prevent freezing even when installed in a cold region, and can extend the life of the deodorizing filter. To do.

[0008]

The present invention has been proposed in order to achieve the above-mentioned object, and the one according to claim 1 is a drying tank having an opening / closing lid, and is placed in the drying tank. The heating means for heating the material to be dried, the stirring mechanism for stirring the material to be dried in the drying tank, and the operation of the pump provided on the way circulate the water discharged from the outlet of the storage tank to the inlet of the storage tank. An ejector which is provided in the water circulation path for returning the water and a nozzle portion which is provided in the middle of the water circulation path and has a small flow passage cross-sectional area to temporarily increase the flow velocity of the circulating water to generate a negative pressure in the suction port communicating with the nozzle portion. And a suction pipe that connects the suction port of the ejector and the suction port of the drying tank in communication with each other, and while sucking the inside of the drying tank by the ejector to reduce the pressure,
It is a water-containing material drying treatment apparatus characterized in that water vapor evaporated from a material to be dried is merged with circulating water at a nozzle portion of an ejector, and the water vapor is liquefied by the circulating water.

According to a second aspect of the present invention, in addition to the structure of the first aspect, a radiator provided in the middle of the suction pipe to cool the temperature of water vapor by air cooling is provided. It is a wet matter drying treatment device.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a radiator provided in the middle of the water circulation path for lowering the temperature of the circulating water is provided.

According to the fourth aspect, the first to third aspects are provided.
In addition to any one of the configuration, a detector for detecting the water temperature in the water circulation path, and monitoring the water temperature in the water circulation path on the basis of the water temperature signal from the detector, on condition that the temperature falls below a predetermined temperature. And a controller that operates the pump while stopping the operation of the heater and the stirring mechanism, and circulates the water in the water circulation path with the drying operation stopped. Is.

According to a fifth aspect, the first to fourth aspects are provided.
In addition to any one of the above configurations, the deodorization filter provided in the storage tank, the water supply valve provided in the middle of the water circulation path, and the water supply valve opened based on the input of the dry operation signal from the dry operation switch A water-containing material drying treatment apparatus comprising: a controller, and water is supplied from outside to the water in the water circulation path prior to drying the water-containing material.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a water-containing material drying treatment apparatus 1, and FIG. 2 is a view for explaining the outline of its internal structure.

This water-containing substance drying treatment apparatus 1 is provided with a drying tank 4 and a decompression mechanism 5 for lowering the internal pressure of the drying tank 4 in a housing 3 in which an operation panel 2 is erected on the rear side. The drying tank 4 is provided with a heating means for heating the material to be dried and a stirring mechanism for stirring the material to be dried, and a front surface of the housing 3 is provided with an outlet 6 for taking out the material to be dried after the drying process. .

The drying tank 4 is mainly composed of a container body 10 having an opening on the upper surface and an opening / closing lid 11 capable of opening / closing the opening. The opening / closing lid 11 is provided by a hinge mechanism 12 arranged at the rear. Is rotatably supported, and the opening / closing lid 11 is locked in a closed state by a locking mechanism 13 arranged in the front. A sealing material 14 that maintains airtightness is provided at a portion of the opening / closing lid 11 with respect to the container body 10.

A heater 15 as a heating means is attached to the outer surface of the bottom surface of the container body 10. The heating means may have any configuration as long as it can heat the material to be dried in the drying tank 4. Further, the portion where the heating means is provided is not limited to the bottom surface portion of the container body 10, and it is desirable to provide the heating means in the peripheral surface of the container body 10 and the like to heat as wide a range as possible.

A vacuum release valve 16 is provided on the outer peripheral surface of the container body 10 immediately below the upper opening, and a take-out port 6 is provided on the outer peripheral surface near the bottom.

In this embodiment, the stirring mechanism for stirring the material to be dried has a motor 20 with a speed reducer on the outer side of the container body 10.
And a shaft 21 with a sealing function is provided by penetrating through the center of the bottom surface of the container body 10, and a chain 24 is spanned between a sprocket 22 attached to the lower end of the shaft 21 and a sprocket 23 attached to the output shaft of the motor 20. The rotary blade 25 is provided on the upper end of the shaft 21 protruding inward, and the fixed blade 2 is provided on the inner peripheral surface of the container body 10 above the rotary blade 25.
It is provided in the horizontal direction with 6a and 26b facing the center.

The rotary blades 25 are attached to the bosses 31 of the blades 30 in a state of being inclined downward (with a rake angle) toward the rotation direction.
And an edge portion 32 is formed at the tip end portion of the wing piece 30, and the gap between the edge portion 32 and the bottom portion of the container body 10 is in a predetermined value (in the present embodiment, so that the edge portion 32 is almost in sliding contact with the bottom portion). 0.1 to 0.3 mm). Further, vertical fins 33 are erected on the upper surface of the rotary blade 25,
The fixed blades 26 and the fins 33, which will be described later, are configured to crush a block-shaped object to be dried. Then, in order to attach the rotary blade 25 to the shaft 21, the boss 3 is attached to the shaft 21.
1 is fitted from above and is tightened with bolts from the side surface of the boss 31, and is also tightened with bolts from above through the pressing plate 34 to prevent floating. The number of the rotary blades 25 is one in the embodiment shown in the drawings, but it may be plural.

The fixed blade 26 is a plate piece that extends substantially horizontally from the inner peripheral surface of the container body 10 toward the center (axis 21). In the embodiment shown in the drawings, the fixed blade 26 is more axial than the locus drawn by the fins 33. Two types of blades, a long blade 26a extending to the side and a short blade 26b that does not reach the locus of the fin 33, are attached at positions facing each other with the shaft 21 in between.

Therefore, when the rotary blades 25 are rotated by the drive of the motor 20, not only can the object to be dried introduced into the bottom of the container body 10 be stirred by the rotary blades 25, but also a relatively large object to be dried. Rotary blade 25
It can be crushed into small pieces by sandwiching it with the fixed blades 26a and 26b. Then, when the material to be dried is gradually crushed, it becomes a muddy clay-like substance due to the water content, and when the water content decreases due to the progress of drying, these materials to be dried gradually become dumpling-like lumps, When the lump becomes large to some extent, the rotator blade 25 and the fixed blade 26a are sandwiched and the fins 33 rotate to break the lump. Therefore, during the drying process, the material to be dried does not form large dumpling-like lumps. Therefore, even if a lump is formed, the size is kept small and the drying efficiency is not lowered.

Further, since the rotary blades 25 rotate while sliding on the bottom surface of the container body 10 with an extremely small gap, it is possible to prevent the material to be dried from sticking to the bottom surface, and the rake angle. Thus, the bubbles in the material to be dried can be positively raised and evaporation can be promoted.

Next, the pressure reducing mechanism 5 will be described. The decompression mechanism 5 circulates water in the water circulation path by the operation of the pump 40 provided in the middle of the water circulation path, and accelerates the flow velocity of water by the action of the ejector 41 provided in the middle of the water circulation path. The suction force is generated by the action of, and the present invention also has a function as a condensing mechanism, as will be described later.

More specifically, as shown in FIG.
A pump 40 is provided in the middle of the water circulation path, an ejector 41 is provided on the discharge side of the pump 40, the outlet side of the ejector 41 is communicatively connected to the inlet 42a side of the storage tank 42, and the outlet 42b side of the storage tank 42 is connected. An inlet side of a radiator 43 as an air-cooling radiator is communicatively connected, an outlet side of the radiator 43 is communicatively connected to an inlet of a pump 40, and these constitute a water circulation system.

The ejector 41 has a nozzle portion having a reduced flow passage cross-sectional area, and has a suction port 44 communicating with the inner surface of the nozzle portion.

The storage tank 42 is for temporarily storing the circulating water, and has therein activated carbon, zeolite,
Deodorizing filter 4 loaded with deodorant such as clay deodorant
5 is provided, and when the amount of water that has passed through the deodorizing filter 45 exceeds a predetermined amount, excess water is overflowed from the drain port 46 and drained. In addition, the drain pipe 47 is attached to the drain port 46.
It is desirable to connect to the drainage pipe and drain it to the sewer through this drain pipe 47.

The radiator 43 has a flow pipe through which water flows, meandering, and a heat radiating plate provided on the meandering portion.
It is configured so that the cooling efficiency is increased by blowing air by zero. Therefore, when circulating water is introduced from the radiator 43, the thermal energy of the circulating water is released into the atmosphere via the heat radiating plate while passing through the meandering portion.
The temperature of the circulating water flowing out from the outlet can be lowered as compared with the water temperature on the inlet side.

The connection between the decompression mechanism 5 having the above structure and the drying tank 4 is such that the suction port 44 opened in the middle of the nozzle portion of the ejector 41 and the suction port 51 opened in the upper part of the container body 10 are suctioned. The pipe 52 communicates with each other, and the inside of the drying tank 4 is depressurized by the negative pressure generated by the ejector 41. A check valve 53 is provided in the middle of the suction pipe 52.

Next, the operation of the water-containing material drying treatment apparatus 1 having the above-mentioned structure will be described. First, the opening / closing lid 11 is opened, and an object to be dried such as food waste is put into the container body 10. Then, after closing the opening / closing lid 11, the drying operation switch 54 of the operation panel 2 is turned on.

When the drying operation switch 54 is turned on, the control device 55 receiving the drying start signal from the drying operation switch 54 closes the vacuum release valve 16 and operates the pump 40, the motor 20, the heater 15 and the like. Let When the pump 40 operates, the water in the water circulation path starts to circulate, and when this circulating water passes through the nozzle portion of the ejector 41, the flow velocity increases, so that a negative pressure is generated at the suction port 44, and this negative pressure action causes a drying tank. The inside of 4 is gradually decompressed. Then, inside the drying tank 4, the water-containing substance is heated by the heat of the heater 15 and agitated by the rotation of the rotary blades 25. Therefore, the water contained in the water-containing material gradually begins to evaporate, and the boiling point decreases due to the pressure decrease in the drying tank 4,
This pressure drop promotes evaporation from the water-containing material.

The water vapor evaporated from the water-containing substance passes through the suction pipe 52 by the suction action of the ejector 41, and the ejector 4 is discharged.
It is sucked to the 1st side and joined to the circulating water by the ejector 41. When the steam joins the circulating water, it is cooled by the circulating water and is liquefied to return to water. That is, in the present invention, the depressurizing mechanism 5 using the circulating water having the ejector 41 also functions as a condenser.

When the water vapor evaporated from the water-containing substance joins the circulation flow and returns to the water, the amount of the circulation water increases, and when the amount of the circulation water exceeds a predetermined amount, the water overflows from the drain port 46. It is discharged to the outside.

Since the circulating water repeatedly passes through the deodorizing filter 45 in the storage tank 42 to be deodorized, the water discharged from the drain port 46 has almost no bad odor. Alternatively, the circulating water may be supplied with a solution of an effective microorganism group consisting of microorganisms capable of decomposing malodorous components, for example, anaerobic photosynthetic bacteria, Azotobacter, yeasts, lactic acid bacteria, etc. for deodorization.

When the material to be dried is heated and dried under reduced pressure in this way, the water contained in the material to be dried gradually evaporates, and the amount of water vapor corresponding to this evaporation is liquefied by the circulating water. , Thermal energy is transferred to circulating water. In this embodiment, as described above, since the circulation system has the radiator 43, the thermal energy of the circulating water is released into the atmosphere when passing through the radiator 43. Therefore, the water temperature of the circulating water does not rise significantly.

If the above drying operation is continued, even if it is in the form of a muddy colloid at the beginning of the drying operation, the material to be dried will eventually become a powder when fully dried. Then, the control device 55
When the drying process is completed after the set time of the timer associated with the above, the controller 55 opens the vacuum opening valve 16 to return the inside of the drying tank 4 to the atmospheric pressure, and the heater 15
Then, the heating is stopped and the process proceeds to the cooling step to cool the material to be dried. When this cooling step is completed, the outlet 6 is opened, and when the discharge switch 56 of the operation panel 2 is operated in this state, the rotary blades 25 are rotated and the object to be dried accumulated at the bottom of the drying tank 4 is taken out. 6 can be taken out to the outside.

In the above-described embodiment, the water vapor evaporated in the drying tank 4 is directly merged with the circulating water from the ejector 41 to be liquefied, but in the middle of the suction pipe 52 connecting the drying tank 4 and the ejector 41. A radiator (not shown) such as a radiator may be provided, and steam may be air-cooled while passing through the radiator to lower the temperature of the steam. It is desirable that the radiator be provided with a blower to enhance the cooling efficiency.

Further, a detector 60 for detecting the water temperature in the water circulation path is provided in the middle of the water circulation path, for example, between the pump 40 and the radiator 43, and the water temperature in the water circulation path is detected based on the water temperature signal from the detector 60. Is monitored by the controller 55,
When cooled to a predetermined temperature (for example, 5 degrees Celsius) or less, even if the operation switch of the operation panel 2 is off, the control device 55 automatically stops the operation of the heater 15 and the stirring mechanism, and only the pump 40 is automatically operated. It may be configured to operate.

With this configuration, even if the temperature drops,
The controller 55 monitors the temperature of the water in the water circulation path, and during the cold season when the temperature falls below a predetermined temperature, the water in the water circulation path can be circulated with the drying operation stopped. The heat from the water is transferred to the circulating water and Joule heat is generated, and the temperature of the water in the water circulating path rises, whereby freezing can be prevented. Therefore, it is possible to prevent freezing and rupture of the pipe, the radiator 43, and the like that form the water circulation path. If the water temperature rises to a predetermined temperature (for example, 10 degrees Celsius) due to the water circulation, the controller 55 automatically stops the operation of the pump 40 based on the water temperature signal from the detector 60. Configure.

As described above, in the present embodiment, the deodorizing filter 45 is provided for deodorizing, but in order to prolong the life of the deodorizing filter 45, the deodorizing filter 45 is cleaned in the water circulation path before the drying process. Water may be supplied automatically. For example, as shown in FIG. 3, if the water supply pipe 61 is connected between the storage tank 42 and the radiator 43 and the drying operation switch 54 is turned on, the controller 55 supplies water based on this drying operation signal. Water supply valve 62 in the middle of pipe 61
Open to supply clean water into the water circulation path.

In this way, when clean water is supplied to the water circulation path from the outside, the water in the water circulation path is expelled from the drain port 46. Therefore, the malodorous component of water in the water circulation path is diluted and the deodorizing filter 45 is washed. Therefore, the life of the deodorizing filter 45 can be extended. When the automatic water supply process is completed, the control device 55 controls to move to the drying process.

In this automatic water supply process, the pump 40 may be operated to circulate water to enhance the cleaning effect of the deodorizing filter 45. Further, the water supply source of the water supply pipe 61 may be the water supply or the water supply tank.

Further, the water-containing substance drying treatment apparatus 1 according to the present invention
In addition to raw garbage, the water-containing material that can be treated with the above may be food waste such as "Okara" which is a slag of tofu, fish heads and internal organs, shrimp and crab shells.

[0043]

As described above, according to the present invention, the inside of the drying tank is sucked by the ejector to reduce the pressure, and
Since the steam evaporated from the material to be dried is combined with the circulating water at the nozzle portion of the ejector and the circulating water liquefies the steam, it is not necessary to separately provide a condenser for liquefying the steam. Therefore, the structure can be simplified. Also, when the condenser is no longer needed, it is no longer necessary to continuously supply cooling water to the condenser, so water pipes are not required,
Installation work can be facilitated, and relocation work once installed can be done easily.

If a radiator is provided in the middle of the suction tube,
Since the temperature of the steam that joins the circulating water can be lowered by the ejector, the temperature rise of the circulating water can be suppressed (claim 2).

By providing a radiator in the middle of the water circulation path, the temperature rise of the circulating water can be surely suppressed. Therefore, the temperature of the water discharged from the drainage port can be suppressed (claim 3).

According to the fourth aspect of the present invention, the water temperature in the water circulation path is monitored, and when the temperature falls below a predetermined temperature, the pump is operated to circulate the water, so that the water in the water circulation path is surely frozen. Can be prevented. Therefore, even if the pipe is installed in a cold region, it is possible to prevent the trouble such as the breakage of the pipe of the water circulation path.

Further, according to the invention of claim 5, water can be supplied from the outside into the water circulation path prior to the drying, so that after the malodorous component in the water circulation path is diluted, the water vapor of the material to be dried can be joined to condense the water. . Therefore, the deodorizing filter is flushed and then deodorized, the life of the deodorizing filter can be extended, and maintenance can be facilitated.

[Brief description of drawings]

FIG. 1 is a perspective view of a water-containing material drying treatment apparatus.

FIG. 2 (a) is a front view showing the inside of the water-containing material drying treatment apparatus, (b) is a right side view showing the inside of the water-containing material drying treatment apparatus, and (c) is the inside of the water-containing material drying treatment apparatus. It is a top view.

FIG. 3 is a schematic configuration diagram of a pressure reducing mechanism.

FIG. 4 is an exploded perspective view showing a main part of a container body and a stirring mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water-containing material drying treatment apparatus 2 Operation panel 3 Housing 4 Drying tank 5 Decompression mechanism 6 Outlet 10 Container body 11 Opening / closing lid 12 Hinge mechanism 13 Locking mechanism 14 Sealing material 15 Heater 16 Vacuum release valve 20 Motor 21 Shaft 22, 23 Sprocket 24 Chain 25 Rotating blades 26 Fixed blades 30 Blades 31 Boss 32 Edge part 33 Vertical fins 34 Holding plate 40 Pump 41 Ejector 42 Storage tank 43 Radiator 44 Suction port 45 Deodorizing filter 46 Drain port 47 Drain pipe 50 Blower 51 Suction port 52 Suction pipe 53 Check valve 54 Simple operation switch 55 Control device 56 Discharge switch 60 Detector 61 Water supply pipe 62 Water supply valve

Claims (5)

[Claims] 1. A drying tank having an opening / closing lid, a heating means for heating an object to be dried put in the drying tank, a stirring mechanism for stirring the object to be dried in the drying tank, and a pump provided on the way. The water circulation path that circulates the water that has exited from the outlet of the storage tank to the inlet of the storage tank and the nozzle section that is provided in the middle of the water circulation path and has a smaller flow passage cross-sectional area. The drying tank is equipped with an ejector for temporarily increasing the flow velocity to generate a negative pressure in the suction port communicating with the nozzle section, and a suction pipe connecting the suction port of the ejector and the suction port of the drying tank for communication. A water-containing material drying treatment apparatus, characterized in that while sucking the air inside to reduce the pressure, the steam evaporated from the material to be dried is merged with the circulating water at the nozzle portion of the ejector, and the steam is liquefied by the circulating water. 2. The water-containing substance drying treatment apparatus according to claim 1, further comprising a radiator provided in the middle of the suction pipe to cool the temperature of water vapor by air cooling. 3. The water-containing substance drying treatment apparatus according to claim 1, further comprising a radiator provided in the middle of the water circulation path for lowering the temperature of the circulating water. 4. A detector for detecting the water temperature in the water circulation path, a water temperature in the water circulation path is monitored based on a water temperature signal from the detector, and a heater and a stirring device are provided on condition that the water temperature falls below a predetermined temperature. 4. A control device for operating a pump while stopping the operation of the mechanism, wherein the water in the water circulation path is circulated in a state in which the drying operation is stopped, according to any one of claims 1 to 3. The water-containing material drying treatment apparatus described. 5. A deodorizing filter provided in the storage tank, a water supply valve provided in the middle of the water circulation path, and a control device for opening the water supply valve based on input of a drying operation signal from a drying operation switch, 5. The water-containing material drying treatment apparatus according to claim 1, wherein the water in the water circulation path is externally supplied before the water-containing material is dried.