JP2650171B2 - Low temperature silo - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature silo, and it is an object of the present invention to provide a silo capable of effectively preventing a stored grain or the like from being heated and deteriorated in summer or the like. Is what you do.

[0002]

2. Description of the Related Art Grains harvested in large quantities in the fall and the like are stored in silos, and silos for storing large quantities of grains are generally installed outdoors. That is, in a silo provided outdoors, the temperature of the outside air rises in summer, and heat is transmitted from the silo wall surface to the inside, so that the temperature of the stored grains increases. However, it is desirable that the grain is stored at a relatively low temperature in a certain range, and it is clear that the quality is degraded by the temperature rise.

In order to prevent the above temperature rise, conventionally,
For example, the walls of the silo are provided with an insulating structure, and low-temperature air is blown into a grain layer deposited in the silo. That is, for example, Japanese Patent Publication No. 57-25168 discloses a silo having a heat insulating wall structure in which cool air is blown into a grain layer from the bottom and taken out from the top to circulate. This is outlined in Figure 3.
As shown in the figure, the cool air discharged from the blower 12 is blown into the silo 11 through the duct 14, reaches the upper part of the silo through the gap of the storage material 16, and returns from the return duct 1
The process returns to the air conditioner 13 via 5. Japanese Patent Application Laid-Open No. 2-207715 discloses a method in which air whose temperature and humidity are adjusted is sent from the top of a silo and is forcibly sucked at the bottom.

[0004]

The prior arts described above all employ a method in which air is directly passed through the grain layer to cool the grain layer. Even if it is a preferable method to deprive the generated heat or cool the grain under the temperature condition higher than the target temperature immediately after the grain input, if the outside air temperature is high such as in the summer, external The amount of heat is propagated inside, and even if the temperature at the center is the target temperature, the temperature around the silo is considerably higher.

That is, when the temperature of the outside air becomes higher than the temperature inside the silo, a temperature gradient occurs in the entire silo. In other words, these gradients increase as the temperature difference between the outside air and the center increases, but as the outside air temperature increases, the temperature in the vicinity of the wall as well as in the center increases. If the temperature inside the silo increases in this way, the quality of the grain will change, and it is necessary to prevent this.

As in the prior art described above, blowing cold air or air with adjusted humidity and temperature into the grain layer is a direct method, and is a simple method if only cooling the grain.
It is difficult to correct the temperature gradient from near the wall to the center.

FIG. 4 shows the manner in which the above-mentioned temperature gradient is generated. In this figure, the vertical axis is temperature, the horizontal axis is the crossing position of the silo, and T _c1 and T _i1 are values corresponding to the low outside air temperature T _o1 . This is the temperature at the center of the silo, inside the wall. Further, T _ch and T _ih are the temperature of the center of the silo and the inner surface of the wall with respect to the high outside air temperature T _oh , respectively, T _m is an appropriate storage temperature, and Tu is a limit temperature at which the grain does not deteriorate. If the outside air is not so high, the temperature gradient inside the silo even kept at a proper temperature T _m the temperature of the central portion is small, all the stored grain is kept near T _m. However, when the outside air temperature _Toh increases, the temperature T _{ih of the} inner wall of the wall may exceed the limit temperature Tu. To prevent this, the temperature of the blown air is reduced to an appropriate temperature _Tm or less, or It is necessary to increase the flow rate.

As described above, it is difficult to flow air to correct the temperature distribution as shown in FIG. 4 in the conventional method of blowing air into a grain layer. There is a great risk that the temperature will rise and exceed the limit temperature and the quality will change. In general, the air inlet and the air outlet are generally provided at the central portion, and the air blow to the vicinity of the peripheral wall which is separated from the straight line connecting them is naturally reduced, and it is difficult to blow air only to the vicinity of the peripheral wall. Therefore, an air flow considerably larger than the theoretical air flow required for cooling is required, and the operation must be inferior in cooling efficiency.

[0009]

SUMMARY OF THE INVENTION The present invention has been studied to solve the problems in the prior art as described above, and has a silo wall having a double wall, and a flow branched into a space between the walls and the inside of the silo. Appropriate storage has been successfully achieved by allowing cooling air to pass through the road, and is as follows.

[0010]

(1) The silo wall has a double structure, and a space between these two walls and a blow pipe to the inside of the silo are constituted by branching from a blower outlet pipe, and the space between the both walls and the inside of the silo are formed. A low-temperature silo wherein outlet pipes are assembled and connected as return pipes to a blower inlet.

(2) A thermometer is provided in the space between both walls and an outlet pipe from the inside of the silo, and these thermometers are pressure-controlled in a space between the wall faces or in a blow pipe to the inside of the silo via control means. The low-temperature silo according to (1), which is connected to a damper and a blower.

(3) When storing the grain in a low-temperature state, the above-mentioned (2) is provided with an adjusting means for adjusting the distribution air volume so that the grain temperature in the silo becomes a uniform state and reducing the power of the blower. ) .

[0014]

The silo wall has a double structure, and the space between the two walls is provided by providing a blowing means for supplying a low-temperature gas to one or both of the space between the two walls and the inside of the silo. And the temperature inside the silo is appropriately controlled.

The silo wall has a double structure, and a space between the two walls and a blow pipe to the inside of the silo are constituted by branching from a blower outlet pipe, and the space between the both walls and an outlet pipe from the inside of the silo are formed. By being assembled and connected as a return pipe to the inlet of the blower, the above-described low-temperature gas is blown by a single blower, thereby simplifying the equipment.

A thermometer is provided in a space between both walls and an outlet pipe from the inside of the silo, and these thermometers are provided with a pressure adjusting damper and a blower provided in a space between the walls or a blow pipe to the inside of the silo via control means. In this way, the above-mentioned air is blown at low cost economically, and the temperature between the both side walls and the grain temperature inside the silo is appropriately controlled.

When the grain is stored in a low temperature state, the distribution air volume is adjusted so that the grain temperature in the silo becomes uniform, and an adjusting means for reducing the power of the blower is provided. No cooling condition to form.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, a specific embodiment of the present invention as described above will be described. As shown in FIG. 1, at least the side wall of the silo 1 has a double structure comprising an inner wall 1a and an outer wall 1b. The outlet pipe 4 from the blower 2 is formed as branched blowing pipes 4a and 4b for the space 6 between the two walls and the inside of the silo 1, and the outlet pipes 5a and 5b from the space 6 and the silo 1 inside. Are combined into a return pipe 5 and connected to the blower 2 via the air conditioner 3, that is, form a circulation system in which the temperature or humidity is adjusted by the air conditioner 3 and returned to the blower 2.

Further, thermometers 8a and 8b are provided in the outlet pipes 5a and 5b as described above, and the detection results of these temperature measuring means are sent to a controller 9, and a control signal from the controller 9 is transmitted to the blower 2 At the same time, the air is sent from an outlet pipe 4 from the blower 2 to a pressure adjusting damper 7 provided in a blow pipe 4b for the space 6 between the two walls so as to be controlled.

That is, the rotational speed of the blower 2 and the pressure adjusting damper 7 are adjusted under the control of the controller 9, and the thermometers 8a and 8b respectively measure the temperature of the grain inside the silo 1 and the temperature measurement approximate to the wall surface temperature. Get That is, the controller 9 compares the two temperature measurement results and controls the pressure adjustment damper 7 so as to increase the air flow to the flow path side showing a high value. In such a case, the rotation speed of the blower 2 is reduced, and conversely, the rotation speed is increased under the condition that the temperature exceeds the reference temperature, so that appropriate operation can be obtained.

As described above, by blowing air into the inter-wall space 6 and the inside of the silo 1 under appropriate control conditions, it is possible to maintain a predetermined temperature suitable for storing grains.
In addition, since the space 6 and the inside of the silo 1 are maintained at an appropriate temperature in this manner, the outside air temperature is prevented from affecting the internal grain temperature, and the gradient between the cross-sectional temperatures in the silo 1 is substantially eliminated. , The whole grain is stored at the proper temperature.

By changing the number of revolutions of the blower, a predetermined temperature condition can be quickly and accurately formed, and an economical operation can be performed with the required power of the blower being minimized while maintaining an appropriate amount of blown air.

FIG. 2 shows another embodiment according to the present invention. That is, in the case of FIG.
While the outer wall 1b is formed as a double shell outside the main body (that is, the inner wall 1a) of the silo 1, the corrugated plate 10 is installed inside the silo main body in FIG.
It has a heavy shell structure. In other words, in the case of FIG. 2, a double shell is constituted by merely two side plates, whereas in the case of FIG. 1, an appropriate spacer or the like is specifically disposed between both walls 1 a and 1 b. It is necessary to.

It should be noted that the element according to the present invention can be appropriately designed as an additional to the above-mentioned basic configuration. For example, it is possible to take measures for equalizing and rectifying the supply and distribution of air to the space 6 between the walls at all parts around the circumference.

[0025]

According to the present invention described above, the grains in the silo can be stored in an appropriate uniform temperature distribution state and can be stored under a condition with a small temperature gradient, and only the blower is sufficient. It is an invention that has a small number of installations and is capable of appropriately obtaining effects such as enabling efficient low-temperature storage with the required power being minimized, and has a large industrial effect. .

[Brief description of the drawings]

FIG. 1 is a sectional explanatory view showing one embodiment of the present invention.

FIG. 2 is a similar sectional view showing another embodiment according to the present invention.

FIG. 3 is an explanatory sectional view showing a conventional silo.

FIG. 4 is a chart illustrating the temperature distribution state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Silo 1a Its inner wall 1b Its outer wall 2 Blower 3 Air conditioner 4 Outlet piping 4a Its blowing piping 4b Its blowing piping 5 Return piping 5a Its outlet piping 5b Similarly, its outlet piping 6 Space between both walls 7 Pressure adjustment damper 8a Thermometer 8b Thermometer 9 controller 10 corrugated sheet 11 conventional silo 12 its blower 13 its air conditioner 14 its sending duct 15 its returning duct

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-138336 (JP, A) JP-A-2-207715 (JP, A) JP-B-57-25468 (JP, B2) JP-B-60- 47497 (JP, B2)

Claims (3)

(57) [Claims] 1. A silo wall having a double structure, wherein a space between these two walls and a blowing pipe to the inside of the silo are constituted by branching from a blower outlet pipe, and the space between the two walls and an outlet from the inside of the silo. A low-temperature silo in which pipes are assembled and connected as a return pipe to an inlet of a blower. 2. A pressure adjusting damper provided in a space between both walls and an outlet pipe from the inside of the silo, and these thermometers are provided in a space between the wall faces or in a blow pipe to the inside of the silo via control means. The low-temperature silo according to claim 1, wherein the low-temperature silo is connected to a blower. 3. The distribution air volume is adjusted so that the grain temperature in the silo becomes uniform when storing the grain in a low temperature state.
The low-temperature silo according to claim 2, further comprising an adjusting means for reducing the power of the blower.