WO2004104484A1

WO2004104484A1 - Tube structure for hot water circulation in heating mat

Info

Publication number: WO2004104484A1
Application number: PCT/JP2003/010275
Authority: WO
Inventors: Yoshiharu Kikusawa; Izumi Kata
Original assignee: Pla Giken Co., Ltd.
Priority date: 2003-05-20
Filing date: 2003-08-12
Publication date: 2004-12-02
Also published as: JP2004347147A; AU2003255014A1; JP3723188B2

Abstract

Heating mat (1) comprises mat substrate (3) having grooves (2) and a resin tube having inside hole (4) through which hot water can be circulated, the resin tube pressed into the grooves. The tube has a multiple tube structure. The first and fifth tube members (9, 13) are formed from a crosslinked polyethylene. The second and fourth tube members (10, 12) are formed from an adhesive resin. The third tube member (11) is formed from polyvinyl alcohol. The crosslinked polyethylene has a low hardness, so that fitting operation thereof can be easily carried out.

Description

Tube structure for hot water distribution in mats for heating

The present invention relates to a heating mat for a floor of a house or the like, and more particularly, to a tube structure that constitutes a part of the mat and allows hot water supplied from hot water supply means to flow therethrough. Background art

As a tube structure for hot water distribution in the heating mat, there is a structure disclosed in Japanese Patent Application Laid-Open No. 8-110600.

According to the above publication, the mat has a mat substrate having a groove extending flat and formed along the surface thereof, and hot water can be flowed through the inner hole by being pressed into the groove in the radial direction. And a resin tube.

Then, the mat is laid on the floor, one end of the tube is communicated with hot water supply means, and hot water from the hot water supply means flows through the inner hole of the tube. The floor is warmed by heat exchange in the room, and floor heating is enabled. The hot water whose temperature has been lowered by the heat exchange is returned from the other end of the tube to the hot water supply means, heated again, and circulated through the tube again.

Further, the tube has a multi-tube structure having first to third tube members that are sequentially superimposed sequentially from the inner side to the outer side in the radial direction, and the inner hole of the first tube member is formed. Is the inner hole of the tube.

In the above case, since the hot water flows through the inner hole of the first tube member, the first tube member is exposed to higher temperature heat of the hot water than the other second and third tube members. Therefore, the first tube member is usually made of cross-linked polyethylene having excellent heat resistance. Have been.

Further, if air outside the tube permeates through this tube and enters even slightly even into the inner hole of the tube, the air may reduce the heat transfer efficiency in the heat exchange. In addition, when air enters the inner hole of the tube, the oxygen in the air dissolves in the hot water one after another, and this oxygen oxidizes and corrodes the metal part of the hot water supply means. It can cause problems. Therefore, the third tube member may be made of polybutyl alcohol having an excellent property of preventing air permeation.

Further, the second tube member is an adhesive resin for bonding the first and third tube members to each other, thereby improving the heat transfer efficiency during the heat exchange.

Further, as disclosed in the above publication, in order to increase the density of tube arrangement on the surface of the mat substrate, the groove is formed so as to be bent with a small radius along the surface of the mat substrate, and the groove is formed along the groove. A tube in which a tube is bent and press-fitted has been proposed.

By the way, in the above publication, the third tube member, which is the outermost tube member of the tube, is made of polybutyl alcohol. However, since this polyvinyl alcohol is higher in hardness than the above crosslinked polyethylene, When the tubes are press-fitted into the grooves of a mat substrate, the frictional force between the side surfaces of the grooves pressed against each other and the outer surface of the third tube member of the tubes tends to be small. For this reason, at the time of assembling the tube to the mat substrate, when the tube is pressed into the groove, immediately after that, the tube may be unintentionally detached from the groove. For this reason, in the above-mentioned assembling work, it is necessary to pay attention so that the tube does not come off from the above-mentioned groove. There is a risk.

In addition, the groove is bent with a small radius as described above, and when the tube is elastically bent in order to press-fit the tube into the bent portion, a large stress is generated in the tube due to the bending. Tends to be. For this reason, when the tube is pressed into the groove, immediately after this, the tube tends to unintentionally and easily come off from the groove due to the large stress, so that the tube is not easily inserted into the mat substrate. The assembling operation may be more complicated. Disclosure of the invention

The present invention has been made in view of the above-described circumstances. When the heating mat includes a mat substrate having a groove on the surface and a tube press-fitted into the groove, the mat substrate An object of the present invention is to make it easy to assemble a tube to a tub.

Further, in addition to the above objects, it is another object of the present invention to further improve the life of the tube.

The present invention comprises a mat substrate having a groove which extends flat and is formed along the surface thereof, and a resin tube which is press-fitted in the groove in the radial direction so that warm water can flow through the inner hole. In the heating water distribution tube structure in the heating mat,

The above-mentioned tube has a multi-tube structure having first to fifth tube members sequentially superposed from the radially inner side to the outer side, and the first tube member is made of cross-linked polyethylene, and the second and fourth tubes are made of cross-linked polyethylene. The tube member is made of an adhesive resin, the third tube member is made of polyvinyl alcohol, and the fifth tube member is made of cross-linked polyethylene or polyethylene.

According to the above invention, the material of the fifth tube member, which is the outermost tube member, is cross-linked polyethylene, or polyethylene, Polyethylene is generally lower in hardness than polyvinyl alcohol, which is the material of the outermost tube member in the prior art.

For this reason, when the tube is press-fitted into the groove of the mat substrate, the frictional force between the inner surface of the groove, which is pressed against each other, and the outer surface of the fifth tube member of the tube becomes larger.

Therefore, at the time of assembling the tube to the mat substrate, when the tube is press-fitted into the groove, the tube is prevented from being unintentionally detached from the groove immediately thereafter. The work of assembling the tube to the substrate will be easier.

In particular, when the fifth tube member is made of polyethylene, the tube is cheaper than when the fifth tube member is made of crosslinked polyethylene.

In the above invention, the groove may be formed to be bent along the surface of the mat substrate.

Here, the groove is bent as described above, and if the tube is flexibly bent to press the tube into the bent portion, a large stress tends to be generated in the tube due to the bending. Therefore, the tube tends to be unintentionally and easily detached from the groove by the stress.

However, as described above, the frictional force between the inner surface of the groove and the outer surface of the fifth tube member of the tube is further increased. Therefore, in assembling the tube to the mat substrate, even if a large stress is generated in the tube by press-fitting the tube into the bent portion of the groove, the tube is unintentionally removed from the groove. The easy detachment is suppressed by the frictional force, and the work of assembling the tube to the mat substrate can be performed more easily.

In the above invention, the tube is an extruded product, and the first tube is formed. The thickness of the fifth tube member may be larger than the thickness of the one tube member. With this configuration, when the tube is press-fitted into the groove, the portion of the fifth tube member pressed against the inner surface of the groove has a large amount of elastic deformation in the thickness direction, and the inside of the groove is increased. The frictional force between the side surface and the outer surface of the fifth tube member further increases.

Therefore, at the time of assembling the tube to the mat substrate, when the tube is press-fitted into the groove, immediately after that, unintended detachment of the tube from the groove is more reliably suppressed. To that extent, the above assembling work can be further facilitated.

Here, in the case where the above-mentioned tube is extruded, when the intermediate molded product in the molten state immediately after being extruded is cooled from the outside and solidified, the temperature distribution in the radial direction of the intermediate molded product is on the outer side. The lower the temperature. Then, this temperature distribution and the temperature gradient of the melting point of the fifth tube member, which is lower than the melting point of the third tube member, are matched. For this reason, the timing when the third tube member and the fifth tube member solidify is more consistent with each other. Moreover, as described above, the thickness of the fifth tube is larger than the thickness of the first tube member. In other words, the thickness of the first tube member is equal to the thickness of the fifth tube member. Smaller than the thickness of the heat capacity. Therefore, the first tube member is also solidified more quickly following the solidification of the third tube member. Therefore, when the above-mentioned tube is extruded, the diameter of each tube member of the tube is made to be highly accurate. Therefore, when assembling the tube to the mat substrate, when the tube is press-fitted into the groove, the press-fitting can be facilitated by the high precision of the dimension of the tube and the inner surface of the groove. And the desired frictional force is secured between the tube and the outer surface of the tube. The detachment is more reliably suppressed, and as a result, the assembling work can be more easily performed.

In the above invention, the thickness of the first tube member may be larger than the thickness of the fifth tube member.

With this configuration, the first tube member is exposed to higher temperature heat through the passage of the hot water through the inner hole, but the heat resistance is increased by the increased thickness of the first tube member. Thus, a longer life of the tube is achieved.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view taken along line 1-1 of FIG.

FIG. 2 is a plan view of the mat.

FIG. 3 is a partial sectional view taken along line 3-3 in FIG.

FIG. 4 is a simplified side view of the extrusion molding apparatus. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings. In FIG. 13, reference numeral 1 denotes a heating mat for a residential floor. The mat 1 has a mat substrate 3 made of expanded polystyrene having one groove 2 formed so as to extend flat in the horizontal direction and bend along the upper surface which is the surface thereof, and the mat 2 A tube 6 made of resin and pressurized in the radial direction and through which hot water 5 can flow through the inner hole 4 and having some elasticity is provided.

The groove 2 has a U-shaped cross section of each part in the longitudinal direction having the same shape and the same size, and the tube 6 has a circular cross section. When the tube 6 is pressed into the groove 2, the tube 6 is elastically compressed, and the inner surface of the groove 2 and the outer surface of the tube 6 are pressed against each other, and A frictional force is generated between each inner surface and the outer surface of the tube 6. The above-mentioned mat 1 is laid on the floor, one end of the above-mentioned tube 6 is communicated with the discharge part of the hot water supply means 7, and the other end is made to communicate with the suction part of the above-mentioned hot water supply means 7, and discharged from this hot water supply means 7. When the heated hot water 5 is allowed to flow through the inner hole 4 of the tube 6, the hot water 5 exchanges heat with the floor and the floor is heated. The hot water 5 whose temperature has been lowered by the heat exchange is returned from the other end of the tube 6 to the hot water supply means 7 and heated, discharged again from the discharge side, and transferred to the tube 6. It is distributed again.

The tube 6 has a multi-tube structure including first to fifth tube members 9 to 13 sequentially superimposed from the radially inner side to the outer side. The first and fifth tube members 9, 13 are made of crosslinked polyethylene having excellent heat resistance. The second and fourth tube members 10 and 12 are made of an adhesive resin such as a phthalic anhydride graft polymer for adhering the tube members adjacent to each other in the radial direction of the tube 6 in surface contact with each other. is there. The third tube member 11 is made of polybutyl alcohol which has an excellent property of inhibiting air permeation. The function of each of these tube members is as described in the prior art.

The preferred specifications of each of the above tubes are as follows. That is, the diameter of the tube 6 is 8.1 O mm. The first tube member 9 has a thickness T1 of about 0.3 mm and a melting point of 130-135 ° C. The thickness Tl, Τ4, of the second tube member 10 and the fourth tube member 12 is 30-80μΐη. The thickness Τ3 of the third tube member 11 is 50-150 μΐη, and the melting point is about 183 ° C. The thickness T5 of the fifth tube member 13 is approximately 0.6 mm and the melting point is 130 ° C to 135 ° C. Here, the work of assembling the tube 6 to the mat substrate 3 is performed. Will be described. First, one end of the tube 6 is pressed into the one end of the groove 2 in the radial direction. . Next, the tool 16 is rolled toward the other end of the tube 6 while pressing the tube 6 with a roller-shaped tool 16 from above (arrow A in FIGS. 2 and 3). Then, the tube 6 is sequentially pressed into the groove 2 from one end to the other end thereof, whereby the assembling work is performed.

The above assembling work may be performed using the tool 16 automatically driven by the robot, or may be performed manually using the tool 16.

In FIG. 4, the extrusion molding apparatus 19 for molding the tube 6 will be described. The extrusion molding device 19 can extrude the thermoplastic first to fifth resin materials 21 to 25 corresponding to the first to fifth tube members 9-1 to 13 by individually heating and melting them. And the first to fifth resin materials 21 to 25 extruded from each of these extruders 26 are passed through, and during this passage, a multi-tube structure is provided in front of the tubes 6. The mold 28 that can mold the intermediate molded product 27 in the process, and the intermediate molded product 27 extruded from the mold 28 are pulled in the same direction (arrow B) as the extrusion direction. A take-off machine 29 for generating a tensile stress in the molded article 27 and a cooling device 30 for cooling and solidifying the intermediate molded article 27 from the mold 28 to the take-up machine 29 from the outside thereof. Have.

The cooling device 30 is provided with a water tank 32 having a negative pressure therein and storing cooling water 31 therein, and the intermediate molded article 27 is provided with the water tank 3 so as to pass through the water of the cooling water 31. It is supposed to penetrate 2. Also, the take-off machine 29 has a variable take-up speed relative to the extrusion speed of the intermediate molded product 27 from the mold 28, and by adjusting this speed, the intermediate molded product 27 The value of the tensile stress generated in the tube 6 is determined, and the diameter of the tube 6 is determined accordingly.

In the above case, the temperature range of 200 ± 20 ° C. is optimal for the intermediate molded product 27 immediately after being extruded from the mold 28 of the extrusion molding device 19. This is the first tu This is because the crosslinked polyethylene, which is the material of the fifth tube member 13 of the one-piece member 9, is not easily oxidized in the above temperature range, and a good molten state can be obtained. Also,

3 The melting point of the polybutyl alcohol in the tube member 11 is approximately 18 3. C, because a good molten state can be obtained.

According to the above configuration, the tube 6 has a multi-tube structure having first to fifth tube members 9 to 13 sequentially superimposed from the radially inner side to the outer side, and the first tube The member 9 is made of crosslinked polyethylene, the second and fourth tube members 10 and 12 are made of adhesive resin, the third tube member 11 is made of polyvinyl alcohol, and the fifth tube member 13 is made of crosslinked polyethylene. Or it is made of polyethylene.

Here, the material of the fifth tube member 13 which is the outermost tube member is cross-linked polyethylene or polyethylene, and the cross-linked polyethylene and polyethylene are also the materials of the outermost tube member in the conventional technology. It is generally lower in hardness than the above polyvinyl alcohol.

For this reason, when the tube 6 is press-fitted into the groove 2 of the mat substrate 3 made of expanded polystyrene, the inner surface of the groove 2 pressed against each other and the outer surface of the fifth tube member 13 of the tube 6 The friction between them is greater.

Therefore, when assembling the tube 6 to the mat substrate 3, the groove 6

When the tube 6 is press-fitted into 2, the unintended detachment of the tube 6 from the groove 2 immediately after that is suppressed, and the work of assembling the tube 6 to the mat substrate 3 is made easier. Can be done.

In particular, when the fifth tube member 13 is made of polyethylene, the cost of the tube 6 is lower than when the fifth tube member 13 is made of crosslinked polyethylene. Further, as described above, the groove 2 is formed to bend along the surface of the mat substrate 3.

Here, the groove 2 is bent as described above, and when the tube 6 is elastically bent in order to press-fit the tube 6 into the bent portion, a large stress is applied to the tube 6 due to the bending. Therefore, the tube 6 is easily and unintentionally easily detached from the groove 2 by this stress.

However, as described above, the frictional force between each inner surface of the groove 2 and the outer surface of the fifth tube member 13 of the tube 6 is further increased. For this reason, even when a large stress is generated in the tube 6 by press-fitting the tube 6 into the bent portion of the groove 2 in the assembling work of the tube 6 to the mat substrate 3, even if the tube 6 The unintended and easy detachment from the groove 2 is suppressed by the frictional force, and as a result, the work of assembling the tube 6 to the mat substrate 3 can be more easily performed.

Further, as described above, the tube 6 is an extruded product, and the thickness T 5 of the fifth tube member 13 is about twice as large as the thickness T 1 of the first tube member 9. The thickness T5 of the fifth tube member 13 is made larger.

For this reason, when the tube 6 is press-fitted into the groove 2, the portion of the fifth tube 13 pressed into contact with each inner surface of the groove 2 has a large amount of elastic deformation in the thickness direction. The frictional force between each inner surface of 2 and the outer surface of the fifth tube member 13 is further increased.

Therefore, when the tube 6 is press-fitted into the groove 2 at the time of assembling the tube 6 to the mat substrate 3, immediately after that, the tube 6 is unintentionally detached from the groove 2. As a result, the assembling work can be more easily performed. Here, in the case where the tube 6 is extruded, when the molten intermediate molded product 27 immediately after being extruded is cooled from the outside by the cooling device 30 and solidified, the intermediate molded product 2 The temperature distribution in the radial direction of Fig. 7 is lower on the outer side. The temperature distribution and the melting point (130-135 ° C) of the fifth tube member 13 are lower than the melting point (183 ° C) of the third tube member 11. Temperature gradient about the melting point. For this reason, the timing when the third tube member 11 and the fifth tube member 13 solidify is more consistent with each other. As described above, as described above, the thickness T5 of the fifth tube 13 is made larger than the thickness T1 of the first tube member 9, and in other words, the force of the first tube member 9 is increased. The thickness T1 is smaller than the thickness T5 of the fifth tube member 13 described above, and the heat capacity is small. For this reason, the first tube member 9 also follows the solidification of the third tube member 11 and is more quickly fixed.

Therefore, when the tube 6 is extruded, the diameter of each of the tube members 911 of the tube 6 is set to a high precision. Therefore, when the tube 6 is press-fitted into the groove 2 at the time of threading the tube 6 to the mat substrate 3, the press-fitting can be facilitated by the high precision of the dimension of the tube 6. At the same time, the desired frictional force is secured between each inner surface of the groove 2 and the outer surface of the tube 6, and it is further ensured that the tube 6 is unintentionally detached from the groove 2. As a result, the assembling work can be more easily performed.

Further, as described above, the thickness T 3 of the third tube member 11 is smaller than the thicknesses T 1 and T 5 of the first tube member 9 and the fifth tube member 13, The dimensions are more than the minimum necessary to prevent air from permeating. Here, the polyvinyl alcohol as the material of the third tube member 11 has a higher hardness than the crosslinked polyethylene or polyethylene, and is considerably expensive. Therefore, by configuring as described above, the first tube member 9 and the fifth tube member 13 ensure predetermined strength at each part in the longitudinal direction of the tube 6, and the tube 6 is bent. This facilitates the above-mentioned assembling work, and further reduces the cost of the tube 6.

Although the above description is based on the illustrated example, the thickness T1 of the first tube member 9 may be larger than the thickness T5 of the fifth tube member 13.

In this way, the first tube member 9 is exposed to higher temperature heat through the hot water 5 flowing through the inner hole 4, but the thickness T1 of the first tube member 9 is increased. As a result, the heat resistance is improved, so that the life of the tube 6 is improved. The mat 1 may extend in the vertical direction or may be inclined. Further, the grooves 2 may be linearly extended, and the cross-section of the grooves 2 may have a width dimension of the upper end opening slightly smaller than that of the bottom part. The dimensions of each part of the tube 6 are not limited to the numerical values described above, and the thicknesses Tl, Τ5 of the first tube member 9 and the fifth tube member 13 are substantially the same. There is good.

Claims

The scope of the claims

1. A mat substrate (3) having a flat groove (2) formed along the surface thereof, and a hot water (5) which is press-fitted in the groove (2) in the radial direction and the inner hole (4) is filled with hot water (5). In the tube structure for hot water distribution in a heating mat provided with a resin tube (6) that can be distributed, the tube (6) is sequentially stacked from the radially inner side to the outer side. (1) A multi-tube structure having a fifth tube member (9-13), the first tube member (9) is made of cross-linked polyethylene, and the second and fourth tube members (10, 12) are made of an adhesive resin. The third tube member (11) is made of polyvinyl alcohol, and the fifth tube member (13) is made of cross-linked polyethylene or polyethylene.

2. The tube structure for hot water distribution in a heating mat according to claim 1, wherein the groove (2) is formed so as to be bent along the surface of the mat substrate (3).

3. The tube (6) is an extruded product, and the thickness (T5) of the fifth tube member (13) is larger than the thickness (T1) of the first tube member (9). 3. The tube structure for hot water circulation in a heating mat according to claim 1 or 2, wherein the tube structure is a hot water distribution tube.

4. The method according to claim 1, wherein the thickness (T1) of the first tube member (9) is larger than the thickness (T5) of the fifth tube member (13). 4. The tube structure for hot water distribution in the heating mat according to <1>.