JP5722746B2 - Sluice freezing prevention device - Google Patents

Description

  The present invention relates to a sluice freezing prevention device that prevents freezing by heating a portion of a sluice facility that may be frozen, and more particularly, to a sluice freezing prevention device that uses induction heating.

  The sluice facility is provided with a door body that is opened and closed to dam or release water, and a door-end fitting that is slidably contacted, pressed, or separated in accordance with the opening and closing operation of the door body. Here, in the winter season or the severe winter season, the water in the vicinity of the door body and the door-to-door hardware freezes, the door body freezes on the door-to-door hardware, and the door body may not be opened and closed. In order to prevent this, a portion (freezing prevention portion) that may be frozen such as a door body or a metal fitting per door is heated to prevent icing of the door body.

  As a freeze prevention device for a sluice that heats the freeze prevention part, a heated member disposed in the freeze prevention part of the sluice gate, a steel pipe attached to the heated member, an insulated wire inserted through the steel pipe, and an insulated wire The thing provided with the alternating current power supply connected to is known (refer patent documents 1-3). This anti-freezing device generates an induction current (eddy current) in the steel pipe by an alternating magnetic flux of alternating current supplied to the insulated wire from the AC power source, and generates heat from the steel pipe by Joule heat according to the electrical resistance of the steel pipe through which the eddy current flows ( Induction heating) heats the member to be heated to which the steel pipe is mounted, prevents water from freezing in the freeze prevention portion, and prevents the door body from icing.

Japanese Patent Publication No.57-40293 JP 2009-256942 A JP 2009-287389 A

  By the way, in the conventional sluice freeze prevention device, even if the member to be heated is buried in concrete or the like, a steel pipe is disposed from the exposed part (ground part) to the member to be heated, and the steel pipe By inserting the insulated wire in such a manner that it can be pulled out, the insulated wire is protected and the insulated wire is replaced during maintenance. For this reason, the steel pipe of the part (part which does not need to be heated) from the ground part to the front of the member to be heated also generates heat due to Joule heat due to the induction current, and power is consumed wastefully.

  The object of the present invention, which was created in view of the above circumstances, is to heat a tubular body in a freeze prevention device for a sluice that extends the tubular body from a member to be heated to the AC power supply side and inserts an insulated wire through the tubular body. It is an object of the present invention to provide a sluice freezing prevention device that does not generate heat in a portion that does not require heating but generates heat only in a portion that requires heating of a pipe body, thereby reducing power consumption.

  The sluice freezing prevention device according to the present invention created to achieve the above object includes a heated member disposed in a freezing prevention part of a sluice facility, a tubular body installed in the heated member, and a tubular body A sluice comprising an insulated wire inserted into the insulated wire and an alternating current power source connected to the insulated wire, and an alternating current is passed through the insulated wire by the alternating current power source to generate an induced current in the tubular body and heat the tubular body. The first material in which the tube extends from the member to be heated to the AC power source side, and the portion from the end on the AC power source side to the front of the member to be heated is less likely to generate an induced current. The part of the member to be heated is formed of a second material that is more likely to generate an induced current than the first material.

  The permeability of the second material may be greater than the permeability of the first material. The first material may be a non-magnetic material, and the second material may be a magnetic material. The first material may be an austenitic stainless material (SUS304 or the like) or a resin.

  At least a part of the portion formed of the first material of the tubular body may be covered with concrete. The first material portion and the second material portion of the tubular body may be connected via a non-conductor.

  According to the sluice freezing prevention device according to the present invention, the second material portion of the tubular body that needs to be heated is focused on without generating little or no heat of the first material portion of the tubular body that does not require heating. Can generate heat. Therefore, power consumption can be reduced as compared with the conventional example in which the entire tube is uniformly heated.

  In addition, when an alternating current is passed through an insulated wire, the induced current is concentrated and generated in the second material portion of the tube, so compared to the conventional example in which the induced current is generated uniformly throughout the tube. The induced current value generated in the second material portion increases and the amount of heat generation increases. Therefore, the member to be heated can be efficiently heated.

It is a perspective view showing the outline of the steel pipe exothermic heater using induction heating used as the premise of the present invention. It is a perspective view showing the outline of the freeze prevention apparatus of the sluice concerning 1st Embodiment of this invention. FIG. 3 is a side sectional view of the antifreezing device shown in FIG. 2. It is a fragmentary sectional view showing the connection part of the 1st material part and 2nd material part of the pipe body with which the freeze prevention apparatus shown in FIG. 1, FIG. 2 was equipped. It is a sectional side view of the freeze prevention apparatus of the sluice concerning 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Steel tube heating heater which is the premise of the present invention)
As shown in FIG. 1, a steel pipe heating type heater 1x includes a steel pipe (tube body) 2x serving as a heating element, an insulated wire 3 inserted through the tube body 2x, and an AC power source 4 connected to the insulated wire 3. An induced current (eddy current) is generated in the tubular body 2x by the alternating magnetic flux of the alternating current supplied to the insulated wire 3 from the alternating current power source 4, and the Joule heat corresponding to the electrical resistance of the tubular body 2x through which the eddy current flows The tube 2x generates heat (induction heating).

  In such a steel tube heating type heater 1x, an induced current is generated in the entire tube 2x, and therefore the entire tube 2x generates heat due to the Joule heat. Therefore, when this is used in a freeze prevention device for a sluice, as described above, even the portion of the tube body 2x that does not require heating similarly generates heat, and wasteful power is consumed. A device for solving this problem is a sluice freezing prevention device according to the present invention described below.

  In addition, you may make it electrically connect both ends of the pipe body 2x arranged in parallel by the short circuit piece 2y. The short-circuit piece 2y exhibits a function of canceling the induced current (eddy current) generated on the outer peripheral surface of the tubular body 2x. Thereby, it can avoid that an induced current leaks from the outer peripheral surface of the tubular body 2y.

(Sluice)
First, the sluice 5 to which the freeze prevention device 1 according to the present embodiment is attached will be described with reference to FIGS. 2 and 3. FIG. 2 is a perspective view of the sluice 5 to which the freeze prevention device 1 is attached, and FIG. 3 is a side sectional view of the freeze prevention device 1 and the sluice 5 shown in FIG. In the sluice 5, a water discharge pipe 6 is embedded in the concrete 7, and a casing (bonnet) 9 that accommodates the door body 8 so as to be vertically slidable is connected to the discharge pipe 6. The bonnet 9 is formed of a hollow body formed in a substantially rectangular parallelepiped shape, and an inlet 91 is opened in accordance with the shape of the discharge pipe 6 on the front surface 9a of the bonnet 9 to which the discharge pipe 6 is connected. An outlet 92 connected to the downstream water channel 10 is opened on the back surface 9b of the bonnet 9.

  The door body 8 accommodated in the bonnet 9 is lifted and lowered by the lifting device 11. The lifting device 11 includes a hydraulic jack 12, a cylinder 12a mounted on a bonnet cover 9c at the top of the bonnet 9, a piston (not shown) accommodated in the cylinder 12a, an upper end of the piston, and a lower end of the door body. 8 and a rod 12b connected to 8. The piston 8 is lifted by a hydraulic device (not shown) to raise the door body 8 to open the inlet 91, and the piston is lowered by the hydraulic device to push down the door body 8 to close the inlet 91. The lifting device 11 is not limited to the hydraulic jack 12 and may be a winch that lifts or hangs the door body 8 with a wire.

  At the entrance 91 of the bonnet 9 that is opened and closed by the door body 8, a seal ring 13 that contacts the front surface 8 a of the door body 8 is provided. The seal ring 13 is formed of a ring body having a triangular cross section formed along the circumferential direction of the inlet 91 with a relatively soft metal such as brass, and contacts the front surface 8a of the door body 8 when the door body 8 is lowered. Stop the water. In winter and severe winter, water near the contact portion between the front surface 8a of the lowered door body 8 and the seal ring 13 may freeze, and the door body 8 may freeze on the seal ring 13 and be unable to be opened. Therefore, it is necessary to heat the vicinity of the seal ring 13 to prevent the above-mentioned ice deposition. In the present embodiment, the contact portion between the door body 8 and the seal ring 13 described above corresponds to a freeze prevention portion, and the seal ring 13 corresponds to a member to be heated.

(First embodiment: sluice freeze prevention device)
Next, the sluice freezing prevention apparatus 1 according to the first embodiment capable of preventing the water near the contact part (freezing prevention part) described above by heating the seal ring (heated member) 13 will be described. . As shown in FIGS. 2 and 3, the freeze prevention device 1 has a tube body 2 for heating a seal ring 13 as a member to be heated.

  The pipe body 2 extends downward from the ground toward the seal ring 13 embedded in the concrete 7, extends in a substantially annular shape around the seal ring 13, and then extends upward so as to protrude to the ground again. Has been issued. Although the number of the tube bodies 2 is one in FIGS. 2 and 3, a plurality of tube bodies 2 may be provided. An insulated wire 3 is inserted into the tube body 2 so that it can be pulled out, and an AC power supply 4 is connected to the insulated wire 3 on the ground so that an alternating current is applied. The AC power supply 4 may be an AC power supply having a commercial frequency of 50 Hz or 60 Hz, but is not limited thereto.

  The tube body 2 is formed of a first material in which a portion 21 from the end portion 2a on the AC power supply 4 side to the front side of the seal ring is made of a first material that hardly generates an induced current when an AC current is passed through the insulated wire 3. The portion 22 is formed of a second material that is more likely to generate an induced current than the first material. The portion 22 of the second material of the tube body 2 is attached around the seal ring 13 by welding or the like, and heat transfer cement is placed on the attachment portion. The heat transfer cement is made of powdered carbon, ceramic, sodium silicate, calcium silicate, and the like, and accurately conducts heat of the second material portion 22 generated by the induced current to the seal ring 13.

  The permeability of the second material portion 22 is greater than the permeability of the first material portion 21. This is because an induced current is more likely to occur when the permeability is higher. For example, the second material portion 22 includes carbon steel such as SS material (rolled steel material for general structure), SM material (rolled steel material for welded structure), SN material (rolled steel material for building structure), cobalt, nickel. The first material portion 21 is made of an austenitic stainless material (SUS304 or the like), aluminum, copper, or a nonmagnetic material such as a resin such as vinyl chloride. In the present embodiment, a steel pipe is used for the second material portion 22, and an austenitic stainless steel (SUS304 or the like) tube or a vinyl chloride tube is used for the first material portion 21.

  According to such a configuration, when an alternating current is supplied to the insulated wire 3, the tube body 2 has a first material portion 21 that does not require heating (the seal ring from the end portion 2a of the tube body 3 on the AC power supply 4 side). The second material portion 22 (the portion of the seal ring 13 of the tubular body 2) that needs to be heated mainly generates heat, with little or no heat generation at the portion 13 before 13). Therefore, power consumption can be reduced as compared with the conventional steel pipe heating type heater (conventional example) 1x that uniformly heats the entire tube body 2. That is, if the heat generation amount equivalent to that of the conventional example is obtained in the portion 22 of the second material, the value of the alternating current applied to the insulated wire 3 can be made smaller than that of the conventional example.

Note that the portion 21 formed of the first material of the tube body 2 is separated from the seal ring 13, and most of the portion 21 is covered with the concrete 7 and does not need to be heated. Moreover, when the bonnet 9 is comprised with a magnetic body (carbon steel, such as SS material), the part 21 formed with the 1st material (nonmagnetic bodies, such as austenitic stainless steel material) of the pipe body 2, By installing a predetermined distance from the bonnet 9, heat generation due to the induced current in the bonnet 9 is avoided. Here, the predetermined distance is so small that the induced current generated in the bonnet 9 by the alternating current flowing through the insulated wire 3 in the portion 21 formed of the first material of the tube body 2 is practically negligible. Is a distance that hardly generates heat.

  Further, as shown in FIG. 2, both end portions of the portion 22 formed of the second material of the tube body 2 may be electrically connected by a short-circuit piece 25. The short-circuit piece 25 cancels the induced current (eddy current) generated on the outer peripheral surface of the portion 22 formed of the second material of the tube body 2 and prevents the induced current from leaking from the outer peripheral surface of the portion 22. However, the short-circuit piece 25 may not be installed in an environment where leakage is not a problem. When the short-circuit piece 25 is not installed, the amount of heat generated in the portion 22 formed of the second material of the tubular body 2 is increased, so that the seal ring 13 that is a member to be heated can be efficiently heated.

  The insulated wire 3 is a heat-resistant insulated wire (heat-resistant insulated cable). This is because, when an alternating current is passed through the insulated wire 3, the second material portion 22 of the tube body 2 generates heat, and it is necessary to avoid the insulated wire 3 from being thermally damaged by the heat. Moreover, since the insulated wire 3 has insulation, when an alternating current is passed, the alternating current leaks to the discharge pipe 6, the seal ring 13, the bonnet 9, etc. via the tube 2. Of course, this can be prevented.

  Further, since the insulated wire 3 is not directly embedded in the concrete 7 but is inserted through the tubular body 2, it is protected from moisture, sharp protrusions, and the like. In addition, since the insulated wire 3 is inserted into the tube body 2 so as to be pulled out, the end portion exposed to the ground of the insulated wire 3 is grasped and pulled up at the time of maintenance performed every several to several decades. By doing so, the tube body 2 is pulled out.

  By the way, when the first material portion 21 of the tubular body 2 is an austenitic stainless steel pipe and the second material portion 22 is a steel pipe, the dissimilar metal corrosion (dissimilar metal contact corrosion) may occur at the connecting portion. There is sex. That is, when moisture exists in the connecting portion described above, the steel tube (second material portion 22) having a large ionization tendency becomes an anode, and the austenitic stainless steel tube (first material portion 21) having a small ionization tendency becomes a cathode. Corrosion occurs in the steel tube 22 serving as the anode.

  In order to avoid this, as shown in FIG. 4, the first material portion (austenite stainless steel pipe) 21 and the second material portion (steel pipe) 22 of the tube body 2 are electrically non-conductive resin. It is connected via a (vinyl chloride pipe) 23. Specifically, male screws 21a and 22a are formed on the outer peripheral surface of the end portion of the austenitic stainless steel tube 21 and the outer peripheral surface of the end portion of the steel tube 22, and a female screw 23a is formed on the inner peripheral surface of the vinyl chloride tube 23. The austenitic stainless steel pipe 21, the vinyl chloride pipe 23, and the steel pipe 22 are physically (mechanically) connected by screwing these male screws 21a, 22a and female screws 23a. With the vinyl chloride pipe 23, the austenitic stainless steel pipe 21 and the steel pipe 22 can be electrically insulated, and contact with different metals can be avoided. The austenitic stainless steel pipe 21 and the vinyl chloride pipe 23, and the vinyl chloride pipe 23 and the steel pipe 22 are bonded together after screwing. Reference numeral 24 in FIG. 4 denotes an adhesive portion.

(Second Embodiment)
5 and 6 show a sluice freezing prevention apparatus 1a according to a second embodiment of the present invention. FIG. 5 is a side sectional view of the sluice 5 to which the freeze prevention device 1a is attached, and FIG. 6 is a sectional view taken along line VI-VI in FIG. 5 (a plan sectional view of the freeze prevention device 1a and the sluice 5). The anti-freezing device 1a according to the present embodiment has the same basic components as the anti-freezing device 1 according to the first embodiment described with reference to FIGS. 2 and 3, and a door as in the first embodiment. It differs from the first embodiment in that not only the portion of the seal ring 13 on the front surface 9a of the bonnet 9 that accommodates the body 8 is heated, but also the side surface 9d and the back surface 9b of the bonnet 9 are heated. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 5 and 6, in the second embodiment, in addition to the plurality of tube bodies 2 being disposed on the front surface 9 a of the bonnet 9 so as to surround the portion of the seal ring 13, A plurality of tubular bodies 2 are also disposed on the side surface 9d and the back surface 9b of the bonnet 9. Similar to the first embodiment, these pipe bodies 2 are a portion 21 (for example, an austenitic stainless steel tube or a vinyl chloride tube) formed from the first material and a portion 22 (for example, a steel tube) formed from the second material. As shown in FIG. 4, they are connected via a resin pipe 23 (for example, a vinyl chloride pipe) that is an electrically non-conductive material.

  The portion 22 of the second material of the tubular body 2 on the front surface 9a of the bonnet 9 is in contact with the outer periphery of the step portion 9e of the bonnet 9 formed so that the seal ring 13 is attached. The second material portion 22 of the tube body 2 on the side surface 9d of the bonnet 9 extends downward in contact with one side surface 9d of the bonnet 9, wraps around, contacts the bottom surface 9f, and contacts the opposite side surface 9d. It extends upward. The portion 22 of the second material of the tube body 2 on the back surface 9 c of the bonnet 9 is in contact with the outer periphery of the outlet 92 of the bonnet 9. Moreover, the insulated wire 3 is penetrated by each tube body 2 so that extraction | drawer is possible, and AC power supply 4 is connected to the insulated wire (refer FIG. 2).

  According to the second embodiment, not only can the portion of the seal ring 13 on the front surface 9a of the bonnet 9 be heated, but also the side surface 9d portion and the back surface 9b portion of the bonnet 9 can be heated. It is possible to surely prevent the door body 8 from being iced in a state where the door body 8 is lowered and closed at the bottom of the bonnet 9. In addition, since the basic effect of this 2nd Embodiment is the same as that of 1st Embodiment, description is abbreviate | omitted.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope of the claims. Needless to say, examples and modifications also belong to the technical scope of the present invention.

  The present invention relates to a heated member disposed in a freeze prevention part of a sluice gate, a pipe installed in the heated member, an insulated wire inserted through the tubular body, an AC power source connected to the insulated wire, and And an anti-freezing device for a sluice gate that generates an induced current in a tubular body by causing the insulated wire to pass an alternating current through an alternating current power source to generate heat.

DESCRIPTION OF SYMBOLS 1 Anti-freezing apparatus 1a Anti-freezing apparatus 2 Tubing body 2a End part 21 First material part 22 Second material part 23 Vinyl chloride pipe as non-conductor 3 Insulated wire 4 AC power supply 5 Water gate 7 Concrete 13 As member to be heated Seal ring

Claims (6)

A member to be heated disposed in the freeze prevention part of the sluice gate, a tube installed on the member to be heated, an insulated wire inserted through the tube, and an AC power source connected to the insulated wire An anti-freezing device for a sluice gate that generates an induced current in the tubular body by causing an alternating current to flow through the insulated wire from the alternating-current power source to generate heat.
The tubular body is extended from the heated member to the AC power source side, and the portion from the end on the AC power source side to the front of the heated member is formed of a first material that hardly generates the induced current. The sluice freezing prevention apparatus is characterized in that the heated member portion is formed of a second material in which the induced current is more easily generated than the first material.   The sluice freezing prevention device according to claim 1, wherein the magnetic permeability of the second material is larger than the magnetic permeability of the first material.   The sluice freezing prevention device according to claim 1 or 2, wherein the first material is a non-magnetic material and the second material is a magnetic material.   The sluice freezing prevention device according to any one of claims 1 to 3, wherein the first material is an austenitic stainless material or a resin.   The sluice freezing prevention device according to any one of claims 1 to 4, wherein at least a part of a portion formed of the first material of the tubular body is covered with concrete.   The sluice freezing prevention device according to any one of claims 1 to 5, wherein the first material portion and the second material portion of the tubular body are connected via a non-conductor.

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