JP4766129B2 - Installation method of pipe heater device - Google Patents

Description

The present invention relates to a method of installing suitably pipe heater equipment used as an apparatus for soil sterilization of plant cultivation facilities (vinyl house, etc.).

  In this type of pipe heater device, conventionally, an inner pipe through which hot water is circulated is provided in a longitudinal direction inside a metal heat pipe, and the inner pipe protrudes with caps having inner pipe insertion holes at both ends of the pipe. In addition to welding and closing in a closed state, the inside is filled with a working fluid with a vacuum (see, for example, Patent Documents 1 to 3). The inner pipe is immersed in the working fluid inside the heat pipe, evaporated at a low temperature by the heat from the inner pipe through which hot water circulates, radiates and condenses on the inner surface of the pipe side wall, repeats the circulation, and flows down downward. Heat can be transferred to the side wall of the pipe through the pipe, and the circumference of the pipe can be heated almost uniformly.

  However, the manufacture of such a conventional pipe heater device with a double pipe structure requires that the caps at both ends be welded and sealed with the inner pipe inserted into the pipe, and the welding process is many and complicated. It takes time and money. Moreover, since warm water is made to flow through the inner pipe as a heat source, when a plurality of devices are connected and lengthened, the heat dissipation amount of the hot water also increases, resulting in a temperature difference depending on the location. In order to prevent this, a device, a pump, or the like that warms warm water in the middle is necessary, and the cost of the entire equipment is inevitable. Conventionally, the temperature of the hot water to be circulated has been managed based on test data and experience, but because it is inaccurate and the time lag is large, fine control according to the location was practically impossible.

  In addition, the installation of these conventional pipe heater devices requires that the inner pipes be connected and piped one by one in order, and it takes time for piping and connection work and also supplies hot water to the inner pipe. It is necessary to install hot water supply equipment including a fuel supply source such as oil and gas, pumps, etc., and it is necessary to operate these equipment after adjusting the equipment and checking for water leaks at the connected parts. Will become longer. In addition, dirt accumulates on the inner wall of the inner pipe through which hot water circulates, which may cause problems such as poor heat conduction to the hydraulic fluid and leakage of the connection part. Other maintenance is required. When replacing the heat pipe itself, it is necessary to drain the water and perform piping and connection work. This maintenance and replacement requires a lot of time, labor, and labor, and the replacement time cannot be predicted. , It will be a regular early replacement before the problem occurs, is not efficient.

JP 2001-272187 A JP 2004-101039 A JP 2007-139401 A

Therefore, in view of the situation described above, the present invention intends to solve the problem that there are few welding processes that require accuracy, temperature control after installation can be finely controlled according to the location, and a device for heating hot water, There is no need for large-scale equipment such as a pump, manufacturing costs and overall equipment costs can be greatly reduced, installation is extremely easy, periodic cleaning is not required, and maintenance work is eliminated. The object is to provide a method of installing a pipe heater device that can be easily replaced.

The present invention is, for the aforementioned problem solving, more becomes substantially cylindrical metal heat pipe inside the working fluid is sealed, a linear heater for heating the working fluid, the heat pipe of the lower side wall outer surface of the hydraulic fluid in the accumulator, the groove having a depth which completely houses the heater extends open and axially on the outer surface is formed over the pipe full length, concave can heat the working fluid in the pipe through the side wall from the heater by detachably mounting the heater in the groove, the heat pipe is more against one of the heater at a short than heater It is an installation method of a pipe heater device for plant cultivation having a length that can be attached to the heat pipe , and after arranging the heater along the installation location on the ground as a base, from above the heater, Heat pipe By sequentially mounting the heaters in the recessed grooves of each heat pipe, a plurality of heat pipes are connected to one heater in a row in the axial direction, and the soil is covered with soil. Provided is a method for installing a pipe heater device for plant cultivation embedded therein .

  In the pipe heater device according to the present invention as described above, a concave groove that opens on the outer surface and extends in the axial direction is formed over the entire length of the pipe on the outer surface of the lower side wall in which the working fluid of the heat pipe is accumulated. Since the heater is detachably mounted in the groove and the working fluid in the pipe is heated from the heater through the side wall, there is no inner pipe for circulating hot water, It is no longer necessary to weld and seal the caps at both ends while the inner pipe is inserted, and the number of welding steps is small and the operation is relatively simple. This shortens the manufacturing time and improves the reliability. In addition, since the side wall is heated from the outside by a heater, temperature control can be performed more accurately and timely depending on the location without requiring large-scale equipment, and the responsiveness is also good. Can be managed accurately.

Installation is completed simply by installing the heater wired to the temperature controller in the groove of the heat pipe, and the operation can be started immediately by turning on the power of 100V or 200V to the temperature controller. Can be greatly shortened and requires little maintenance, and the heater replacement time can be easily predicted by measuring the electrical resistance between the terminals and the insulation resistance between the sheath and the terminal at the heater terminal, When replacing the heat pipe, the recovery time is very short because it can be easily detached from the heater.

  In addition, since a metal tape or lid member that is attached to the opening of the recessed groove where the heater is mounted and closes the opening is provided, it is not affected by external members that contact through the opening. The heat from the heater can be reliably transferred to the side of the side wall of the heat pipe via the tape or the lid member, heat management can be performed more accurately, and the entire circumference of the heat pipe can be heated more uniformly.

  In addition, when the heat pipe and the heater outer surface portion are made of different metals, an insulating layer is formed on at least the groove on the outer surface of the heat pipe, so that moisture or the like exists in the groove groove heated by the heater. Even in this case, electrolytic corrosion between different metals can be prevented.

  In addition, since the heat pipe shorter than the heater is connected to a single heater in the axial direction by mounting the heater in the concave groove of each pipe, In the one-to-one relationship between the pipe and the outer pipe, it is necessary to connect the inner pipes, but this is not necessary, and the installation / replacement operation is remarkably simplified.

  Further, according to the method for installing the pipe heater device according to the present invention, after the heater is first disposed along the installation location of the pipe heater device, the heat pipe is recessed from the top of the heater. Since a plurality of the heaters are connected in the axial direction by mounting the heaters in the groove, the installation / replacement operation is remarkably simplified as described above, and the construction cost can be greatly reduced.

Sectional drawing which shows the pipe heater apparatus which concerns on typical embodiment of this invention. Explanatory drawing which similarly shows the modification of a pipe heater apparatus. Explanatory drawing which similarly shows the other modification of a pipe heater apparatus. (A)-(f) is explanatory drawing which shows the further another modification of a pipe heater apparatus similarly. (A), (b) is explanatory drawing which shows the further another modification of a pipe heater apparatus similarly. Explanatory drawing which shows the modification using the heater cable coated by insulating resin coating as a heater. Explanatory drawing which similarly shows the installation procedure of a pipe heater apparatus.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIGS. 1A to 1C are explanatory views showing the structure of a pipe heater device according to a typical embodiment of the present invention, and FIGS. 1A and 1B show a state where a heat pipe and a linear heater are assembled. (C) is sectional drawing of the assembled state. In the figure, reference numeral 1 is a pipe heater device, 2 is a heat pipe, 3 is a heater, and 4 is a working fluid.

  As shown in FIG. 1, the pipe heater device 1 according to the present invention heats a metal heat pipe 2 in which a working fluid 4 is enclosed, and the working fluid 4 in the heat pipe 2, thereby evaporating and condensing a cycle. And a concave groove 21 opened on the outer surface and extending in the axial direction is provided over the entire length of the pipe on the outer surface side of the side wall 20 on the lower side of the heat pipe 2 in which the working fluid 4 is accumulated. The heater 3 is detachably mounted in the concave groove 21, and the heat of the heater 3 is transferred to the working fluid 4 in the pipe through the side wall 20.

  The heat pipe material can be the same as the conventional material, such as aluminum, aluminum alloy, stainless steel, nickel, copper, titanium, or other stable metal material that does not deteriorate due to reaction with hydraulic fluid. Can do. In addition, as for the working fluid sealed inside, as in the past, an organic or inorganic one can be selected according to the operating temperature range. For example, alcohols such as ethanol, ammonia, water, and the like can be used. . Furthermore, the internal pressure of the heat pipe is also set as appropriate according to the vapor pressure of the working hydraulic fluid, the working temperature range, and the like.

  As the heater 3, a conventionally known sheath heater or micro heater can be used, and a known one used in other fields can be used. In this example, a sheath heater is used, but as shown in FIG. 6, a tape heater having an elliptical or oval cross section coated with an insulating synthetic resin film such as tetrafluoroethylene resin (PTFE resin), etc. Can also be suitably used. In the case of a sheath heater or a micro heater, if the material of the outer-layer metal tube and the heat pipe are different, there is a risk that electrolytic corrosion will occur during heating due to moisture or the like, but the tape heater or the like is advantageous in that there is no such risk.

  In the pipe heater device 1 of the present invention, the heat of the heater 3 as a heat source is transferred to the hydraulic fluid 4 on the inner surface side of the side wall 20 through the heat pipe side wall 20 constituting the concave groove 21, and the hydraulic fluid 4 evaporates at a low temperature, dissipates heat on the inner surface of the upper side wall of the heat pipe 20, condenses, and flows downward, and repeats the same circulation cycle as before. The heat is transferred to the heat pipe, and the periphery of the heat pipe is heated almost uniformly.

  As shown in FIG. 1B, the heat pipe 2 has a substantially cylindrical metal main body pipe 5 having both ends opened, and a disk-like shape for hermetically welding and sealing the openings at both ends. The cap member 6 is composed of a cap member 6, and the concave groove 21 is formed in the lower side wall of the main body pipe 5. The left and right cap members 6 are evacuated to the inside of the pipe and operated by a predetermined amount. A filling port 60 for enclosing the liquid 4 to form an operating space and a sealing portion 61 for sealing this by welding are provided. The pipe length, pipe diameter, and the like of the heat pipe 2 (main body pipe 5) can be arbitrarily set in accordance with, for example, the situation at the construction site. Further, the shape of the shaft may be not only a straight shape but also a shape in which the shaft is curved or bent. In this case, the heater 3 may be bent and attached. In addition, the cross-sectional shape of the heat pipe 2 (the cross-sectional shape of the main body pipe 5) is basically circular except for the constituent parts of the concave grooves 21, but is not limited to such a shape. The basic shape is elliptical. A shape such as a shape, a partially cut-out circle, a triangle, a quadrangle, a trapezoid, or a polygon may be used.

  The concave groove 21 is a U-shaped long groove having an inner diameter (substantially the same curvature) as the outer diameter of the heater 3 to be mounted, and the heater 3 is in close contact with the inner surface of the concave groove 21 in the mounted state. It is configured to efficiently transfer heat. Of course, a structure having a gap may be used. In addition, when the material of the heat pipe 2 and the material of the outer layer of the heater 3 are different metal materials, there is a problem that electrolytic corrosion occurs due to the presence of moisture or the like, particularly in the groove portion heated by the heater. Therefore, it is preferable to coat and form an insulating layer at least on the contact portion of the concave groove 21 with the heater 3.

  In addition, the outer surface of the heat pipe 2 other than the concave groove 21 is highly likely to be corroded by acidic or alkaline soil, particularly when it is embedded in the soil, and similarly, a corrosion-resistant coating layer is formed. It is preferable. Therefore, it is a preferred embodiment to form a corrosion-resistant insulating coating layer on the entire outer surface of the heat pipe 2 including the concave groove 21. If the heat pipe 2 is made of aluminum, for example, it is preferable that the outer surface including the groove 21 is baked and coated with an acrylic corrosion-resistant insulating paint. In the case where they are not different metals, the above-mentioned electrolytic corrosion does not occur in the first place. However, the presence of such a coating layer in the concave groove 21 makes it possible for the heater 3 and the concave groove 21 to be formed particularly in the case of a synthetic resin coating layer such as acrylic. Since a relatively soft layer is interposed between the layers, the degree of adhesion is improved and the heater is prevented from falling off.

  FIG. 2 shows that the heater 3 is locked to the opening edge of the groove 21 in order to ensure the close contact of the heater 3, and the ridge 22 for preventing the detachment from the groove 21 on the inside. The modification which protruded is shown. As a result, the heater 3 is prevented from floating away from the concave groove 21, and the above-described efficient heat transfer is maintained. Here, the ridges 22 are provided only on one of the left and right end edges, but may be provided on both. 4A, when the groove 21 is formed deeply, the ridge 22 may be formed at the edge of the groove to prevent at least the heater 3 from being detached. 4 and the inner surface of the concave groove 21 are preferably provided at an internal position where the heater 3 can be locked in a close contact state as shown in FIG.

  As shown in FIG. 1, after mounting the heater 3 in the concave groove 21, a metal tape 24 is attached from the outside so as to close the concave groove opening. It is a preferable condition that all the heat of the heater 3 is transmitted to the side wall 20 constituting the concave groove 21, and is transmitted to the inner working fluid, and the heater 3 mounted in the concave groove 21 is on the opening side. Although heat is generated from the non-contact portion, heat is not transmitted to the side wall 20 side. Moreover, if it is in contact with an external member having good heat conductivity, the heat escapes to the outside, leading to a decrease in efficiency. Furthermore, the above-described electrolytic corrosion is likely to occur when moisture or other substances enter from the outside. Therefore, if the metal tape 24 is attached, the heat generated in the opening portion of the heater 3 can be transmitted to the side wall 20 through the metal tape 24, and the contact of the heat-conductive external member can be achieved. Such an unexpected situation can be prevented in advance, and the entire circumference of the heat pipe 2 is heated through the metal tape 24, and the ground below can also be heated in the same manner, so that heat management can be performed more accurately. It becomes. The material of the metal tape 24 is preferably the same as the material of the heat pipe 2, but is not limited at all. In this example, an aluminum foil tape or the like is suitable.

  For the same purpose, as shown in FIG. 3, a metal lid member 7 is preferably applied from the outside. The lid member 7 is shaped to be in close contact with both the heater 3 and the side wall 20. Specifically, the cover member 7 is in close contact with the heater 3 from the inner surface side of the cover plate 70 having a width for closing the groove opening. It has a pair of left and right leg portions 71, 71 extending in this manner, and is configured to have a substantially bowl shape in cross section. The inner surface side constituted by the legs 71 and 71 is configured to form a surface having the same curvature as the outer shape of the heater 3 and to be in close contact with the outer surface of the heater 3. In addition, the vicinity of the opening of the groove 21 has an inwardly extending shape, and the leg portions 71 and 71 are fitted and locked to the inner surface of the groove 21.

  It should be noted that the metal tape 24 and the lid member 7 are not necessarily in direct contact with the heater 3 in order to heat the entire circumference including the lower part of the heat pipe 2 and prevent contact with external members. Alternatively, the lid member 7 may have a configuration in which the leg portions 71 and 71 are not in contact with the heater 3. This is advantageous when the lid member 7 directly transfers heat from the heater 3 and the portion of the lid member 7 becomes relatively hot compared to other pipe wall surfaces, and it is desirable to prevent this. That is, the metal tape 24 or the lid member 7 is not contacted, and the heat transfer from the side wall 20 is suppressed by suppressing the direct heat transfer to the metal tape 24 and the lid member 7 through the air heat insulating layer between the heater 3. Such a structure is also a preferred modification. In addition, in the case of floor heating or the like in which the upper portion is desired to be heated in preference to the lower portion of the heat pipe 2, it is also preferable to use a heat insulating tape instead of the metal tape 24 or to form the lid member 7 with a heat insulating material. It is an example.

  As another example, as shown in FIG. 5 (b), ribs 23 and 23 are provided on the lower inner wall surface where the working fluid 4 is accumulated to increase the efficiency of heat conduction from the side wall 20 to the working fluid 4. Is also a preferred example.

  With respect to the shape of the groove 21, in the representative example of FIG. 1, the depth of the groove 21 is set to a minimum depth that can completely accommodate the heater 3 to prevent an increase in material cost. As shown in FIG. 4A, the groove 21 can be deepened. If the concave groove 21 is deepened in this way and the mounting position of the heater 3 is set at the approximate center of the hydraulic fluid 4, heat can be efficiently transferred to the hydraulic fluid 4 through the wall surface forming the deep concave groove 21. . In this case, as described above, the position of the ridge portion 22 is preferably provided at an internal position where the heater 3 can be locked in a state of being in close contact with the bottom of the groove 21. Furthermore, as shown in FIG. 4B, it is also a preferable example to provide a lid member 7 that fills the excess space in the groove 21.

  Further, as shown in FIGS. 4C and 4D, a configuration in which the concave groove 21 is bent into a curved shape or a substantially L-shape is also a preferable modification. According to this, it becomes possible to attach the heat pipe 2 to the already installed heater 3 from an oblique direction, and the assembly of the heat pipe 2 and the heater 3 can be performed easily and reliably even in a narrow place. . Further, it is possible to prevent the heater 3 from being detached and lifted from the concave groove 21 after mounting. Further, as shown in FIGS. 4 (e) and 4 (f), a structure that further increases the degree of freedom in workability is one in which the concave groove 21 is opened in the horizontal direction and a heater can be inserted from the horizontal direction. This is a preferred example.

  In the present invention, the number of concave grooves 21 formed in the heat pipe 2 and the number of heaters 3 to be mounted are not limited, and a plurality of the grooves may be provided as shown in FIG. In this embodiment, as shown in FIGS. 7B to 7C, the heat pipe 2 shorter than the heater 3 is sequentially placed in the concave groove 21 of each pipe 2 with respect to one heater 3. By mounting the heater 3, the apparatus is configured such that a plurality of heat pipes 2 are continuously mounted in the axial direction. It is preferable that the heat pipes 2 be arranged continuously with as little gap as possible. For example, since the sealing portion 61 exists on one side, the other cap member 6 is provided with a concave portion into which the sealing portion fits and is fitted to each other. It is good also as a structure.

  The installation procedure of such a pipe heater apparatus 1 is demonstrated based on FIG. 7 for a plant cultivation facility as an example. First, as shown in (a) in the figure, the heater 3 is disposed along the installation location on the ground 80 as a base, and from above the heater 3 as shown in (b) to (c) in the figure. By installing the heaters 3 in the concave grooves 21 of the respective pipes sequentially, a plurality of the heat pipes 2 are connected in the axial direction, and finally covered with the soil 81 as shown in FIG. Is completed. In this way, the work load is significantly reduced and the work time and cost are greatly reduced compared to the conventional work in which the inner pipes are connected to each other so that there is no liquid leakage. Can be reduced.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Pipe heater apparatus 2 Heat pipe 3 Heater 4 Hydraulic fluid 5 Main body pipe 6 Cap member 7 Lid member 20 Side wall 21 Concave groove 22 Projection part 23 Rib 24 Metal tape 60 Filling port 61 Sealing part 70 Cover plate 71 Leg part 80 Ground 81 soil

Claims (1)

And the heat pipe of substantially cylindrical metal that inside working fluid is sealed, becomes more linear heater for heating the working fluid, the outside face of the side wall of the lower of the hydraulic fluid of the heat pipe is accumulated , the groove having a depth which completely houses the heater extends open and axially on the outer surface is formed over the pipe full length, the heater removably be mounted to the concave groove plant cultivation having a length through the side wall from the heater can heat the working fluid in the pipe, the heat pipe can be attached a plurality of heat pipes with respect to one of the heaters in shorter than the heater by An installation method of a pipe heater device for
After arranging the heater along the installation location on the ground as a base,
From above the heater, the heat pipe is sequentially installed in the groove of each heat pipe so that a plurality of heat pipes are attached to one heater in the axial direction. Multiple units,
Covered with soil and buried in the soil
The installation method of the pipe heater apparatus for plant cultivation.

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