JPH0345158Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a temperature detection device for powder and granular material in a silo related to temperature control technology in a grain silo.

[Conventional technology]

Conventionally, when measuring the temperature of stored grain in a grain silo, as shown in FIG. The cable d has a conducting wire along a wire rope to resist the tension caused by the frictional force that occurs when grain is discharged, and a temperature sensing end e connected to the conducting wire.
The temperature of the grain at the measurement position is detected by the output signal from the temperature detection terminal e.

[Problem that the invention attempts to solve]

However, according to the cable d having the above configuration, since the wire rope with high thermal conductivity is inserted, the heat of the grain above and below the measurement position is conducted into the wire rope, and the heat of the grains above and below the measurement position is conducted into the wire rope. In order to affect the temperature detection terminal e, the temperature detection terminal e
Since the average temperature of grains over a wide range is detected from Because it has poor abrasion resistance, the film becomes thicker, but because it is a poor thermal conductor, it is difficult for the heat of the grain to be transmitted to the temperature detection end.
This had the problem of not being able to precisely control the temperature of the grain inside the silo.

The present invention was developed in view of the above problems, and the purpose is to provide a new temperature detection device for powder and granular material in a silo that can accurately measure the stratified temperatures of powder and granular material in a silo. be.

[Means for solving problems]

In order to achieve the above object, the present invention provides a unit length unit tube made of a good thermal conductor through which a conductive wire can be inserted and a temperature sensing end can be fixed to the inner wall as necessary, and a unit tube at the end of the unit tube. On the other hand, there is a joint member made of a thermally poor conductor whose both ends can be attached and detached, and a plurality of conducting wire penetration holes of appropriate hole diameters are drilled therein, and a measurement tube connected to an appropriate length by the above-mentioned unit pipe and the joint member. a temperature detection end fixed to the inner wall of the unit pipe at a desired position; an output conductor connected to the output end of the temperature detection end and led out to the outside by passing through the unit pipe and the conductor penetration hole; A temperature detection device was constructed by a clearance between the hole and the output conductor, and a sealing material for burying the conductor penetration hole through which the output conductor does not penetrate.

[Effect]

The above-mentioned temperature detection device connects the unit pipes via a joint member, and configures a measurement pipe that is connected and extended to a length corresponding to the height of the temperature measurement part in the silo, and also connects the unit pipes to a length corresponding to the height of the temperature measurement part in the silo. A temperature measuring device is fixed on the inner wall, the output conductor is led out from one end, and the measuring tube is inserted vertically into the silo with the unused conductor penetration hole and the clearance between the output conductor and the output conductor sealed with a sealant. It is used by fixing either the upper or lower ends or one end to the silo.

In other words, in the measurement tube with the above configuration, the unit tube on which the temperature measuring device is fixed is made of a good thermal conductor, so the temperature measuring device detects the average temperature of the powder layer in the silo corresponding to the length of the unit tube. At the same time, adjacent unit pipes are connected by a joint member made of a thermally poor conductor to prevent heat propagation, and the conductor penetration hole of the joint member is sealed with a sealing material. Since the air inside the pipe is prevented from flowing into other unit pipes by convection, it is not affected by the temperature of the powder layer corresponding to the position of other unit pipes.
The temperature at the measured position can be detected accurately.

Further, in the measurement tube having the above configuration, the unit tubes at positions where temperature measurement is not required can be constructed from thermally poor conductors.

Furthermore, since the unit tubes are good thermal conductors, even if the tube thickness is increased to improve wear resistance, it will not impede heat transfer to the grains.

〔Example〕

Hereinafter, one embodiment of the temperature detecting device for powder and granular material in a silo according to the present invention will be described with reference to FIGS. 1 to 5.

Reference numeral 1 indicates a good thermal conductor (thermal conductivity of 15.0 W・m ^-1・K ^-1 or more; temperature condition: 0
℃) detection unit tube, reference numeral 2, is an extended unit tube having the same length and diameter as the detection unit tube 1, and female screws 4, 4 are screwed at both ends of both unit tubes 1, 2. The joint member 5 is provided therein and is removably screwed and connected to male screws 6, 6 screwed on both ends of the joint member 5. The above-mentioned joint member 5 is formed of a thermally poor conductor (thermal conductivity: 5.0 W・m ^-1・K ^-1 or less; temperature condition: 0°C), and the pipe ends of the unit pipes 1 and 2 are brought into contact with the central part of the outer periphery. Flange part 7 of appropriate width
, and one or more conducting wire penetration holes 8 having an appropriate inner diameter are bored in the axial direction. The unit pipes 1 and 2 are screwed together via a joint member 5 to form a measurement pipe 9 of a desired length as shown in FIG. Temperature detection end 3 fixed on the inner wall of the unit pipe 1
The output conductor 10 connected to the unit pipes 1 and 2 and the conductor through hole 8 of the joint member 5 is inserted through the conductor through hole 8 of the unit pipe 5 to be led out from one end of the measurement tube 9. The gap between the conductor insertion hole 8 and the output conductor 10 is sealed with an airtight sealing material 11.

Further, the measurement tube 9 includes an end tube 12 of an appropriate length, which has a female screw 13 screwed into one end of the same diameter and the same diameter as the unit tubes 1 and 2 and screwed into the male screw 6 of the joint member 5, if necessary. and the end pipes 12 are connected to both ends to form a single rod-shaped body, and with respect to the silo,
For example, as shown in FIGS. 3 to 5, the upper end or upper end portion of the measuring tube 9 is fixed via a clamp 18 to the inner diameter of an opening 17 formed in a top slab 16 formed at the upper end of the tank wall 15, Further, the lower end is welded and fixed to the inlet cover 20 installed on the hopper 19, and the inlet cover 20 is installed vertically.

In this state, the output conductor 10 led out from the upper end of the measuring tube 9 is connected to the input terminal of the temperature measuring device 14, and the temperature of the powdered material such as grain stored in the silo is measured per layer equivalent to one unit tube at a desired position. It can be measured as the average temperature of

It goes without saying that the width of the measurement layer can be made smaller by shortening the length of the measurement unit tube 1, and the extension unit tube 2 at a position where temperature measurement is not required is made of a thermally poor conductor. (Thermal conductivity
15.0W・m ⁻¹・K ⁻¹ or less; temperature condition: 0°C).

[Effect of idea]

As mentioned above, the temperature detection device for powder and granular material in a silo according to the present invention connects the unit tubes in a non-contact state through a joint member of a thermally poor conductor to form a measurement tube. Only the average temperature of the powder layer equivalent to a unit tube is measured, improving temperature measurement accuracy and making it possible to more precisely control the temperature inside the silo. Therefore, the practical effects of this invention are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front sectional view of the main part of the powder temperature detection device of the present invention, and Fig. 2 is a line A--A in Fig. 1.
3 is a front sectional view showing the state installed in the silo, FIG. 4 is an enlarged sectional view taken along line B-B in FIG. 3, and FIG. 5 is an enlarged sectional view taken along line C-C in FIG. The perspective view, FIG. 6, is a schematic front sectional view showing a conventional measuring device. 1... Unit tube for detection, 2... Unit tube for extension, 3
...Temperature detection end, 5...Joint member, 8...Conductor penetration hole, 9...Measurement tube, 10...Output conductor, 11...
... sealing material, 12 ... end tube, 14 ... temperature measuring device.

Claims (1)

[Scope of utility model registration request] A unit tube made of a good thermal conductor with a thermal conductivity of 15.0W・m ^-1・K ^-1 (temperature condition 0℃) or higher, which allows the conductor to be inserted and the temperature detection end fixed to the inner wall, and the unit tube. Thermal conductivity is 5.0W・m ^-1・K ^-1 (temperature condition 0
°C) A joint member made of the following thermally poor conductor, a temperature detection end fixed to the inner wall of the unit pipe at a desired position of the measurement pipe connected to an appropriate length by the unit pipe and the joint member, and the temperature detection end. an output conductor led out from the output end of the unit pipe and through a conductor penetration hole, and a sealing material for filling the gap between the conductor penetration hole and the output conductor and an unused conductor penetration hole; A temperature detecting device for powder or granular material in a silo, characterized in that the measuring tube is fixedly installed at a desired position in the silo.