JP2002195577A - Floor heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate recycling by maintaining a heat exchange efficiency high by surely heat insulating in a multiple tube heat exchanger used for a floor heating system. SOLUTION: The floor heating system comprises a heat insulator assembly (240) having a lower heat insulation member (241) for covering a lower part of the multiple heat exchanger (201) for heat exchanging between a refrigerant and water, and an upper heat insulation member (242) for covering an upper part of the exchanger (201).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat pump type floor heating device.

[0002]

2. Description of the Related Art In a typical air conditioner, a refrigerant circuit is constituted by a compressor housed in an outdoor unit, an outdoor heat exchanger, a four-way switching valve, and an indoor heat exchanger housed in an indoor unit. When the four-way switching valve is switched so that the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator, a cooling operation can be performed.
In addition, when the four-way switching valve is switched so that the outdoor heat exchanger functions as an evaporator and the indoor heat exchanger functions as a condenser, a heating operation can be performed.

[0003] A so-called double tube in which an inner tube is inserted into an outer tube to exchange heat between a liquid or gas passing through the inner tube and a liquid or gas passing between the outer tube and the inner tube. Heat exchangers are known. Water is introduced into one path of such a double-tube heat exchanger, and a refrigerant is introduced into the other path to cause heat exchange, and the hot water after the heat exchange is circulated in a hot water pipe installed on the indoor floor. By doing so, floor heating becomes possible. In this case, the refrigerant circuit is branched from an outdoor unit compressor, an outdoor heat exchanger, etc., connected to a double-pipe heat exchanger, and control is performed so that the double-pipe heat exchanger functions as a refrigerant condenser. To perform floor heating.

[0004]

The double-pipe heat exchanger as described above is housed in a casing of a floor heating unit installed together with an outdoor unit. In order to keep the heat exchange efficiency of the double-pipe heat exchanger high, it is desirable to make the pipe length as long as possible. It is necessary to make the overall shape compact. For this reason, it is conceivable that the double tube heat exchanger is bent at both ends in the length direction and overlapped a plurality of times to form an oval shape in plan view.

[0005] In order to maintain the heat insulation of such a double tube heat exchanger, it is conceivable to cover the outer periphery of the double tube heat exchanger with a heat insulating material. Usually, a heat insulating sheet such as foamed polyethylene is stuck to the side surface of the double tube heat exchanger with an adhesive. In this case, the heat insulation sheet cannot completely cover the double-tube heat exchanger, and the exposed portion of the double-tube heat exchanger is large, so the heat insulation effect is small and the heat exchange efficiency due to heat loss is reduced. I do.

[0006] Further, at the time of disposal, the operation of separating the double-pipe heat exchanger and the heat insulating material becomes complicated, and it is difficult to completely separate the heat exchanger. Therefore, there is an inconvenience that the number of work steps and cost for recycling increase.

In addition to the above-mentioned double tube heat exchanger,
Triple tubes and other multi-tube heat exchangers have similar problems. SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-tube heat exchanger used for a floor heating device, insulate heat reliably, maintain a high heat exchange efficiency, and facilitate recycling.

[0008]

According to a first aspect of the present invention, a floor heating apparatus comprises a compressor, an outdoor heat exchanger functioning as an evaporator, and a refrigerant circuit together with the compressor and the outdoor heat exchanger. A multi-pipe heat exchanger that has a refrigerant path and a water passage path through which water passes, and performs heat exchange between the refrigerant and water passing through each path; Hot water pipe for passing hot water after heat exchange in the heat exchanger, a circulating pump for circulating water between the water passage of the multi-pipe heat exchanger and the hot water pipe, and a lower heat insulating member covering the lower part of the multi-pipe heat exchanger And a heat insulating material assembly comprising an upper heat insulating member covering an upper part of the multi-tube heat exchanger.

In this case, the multi-pipe heat exchanger can be completely covered by the heat insulating material assembly, and the heat insulation of the multi-pipe heat exchanger can be kept high. Further, the heat insulating material assembly can be separated into a lower heat insulating member and an upper heat insulating member, so that it can be easily disassembled and recycled easily.

A floor heating apparatus according to a second aspect of the present invention is the floor heating apparatus according to the first aspect, wherein the multi-tube heat exchanger is bent at both left and right ends and is formed into a substantially oval shape which is superposed plural times. And the heat insulator assembly is oval donut shaped corresponding to the shape of the multi-tube heat exchanger.

In this case, the multi-pipe heat exchanger housed in the floor heating device can be made compact, and the multi-pipe heat exchanger can be reliably insulated by the heat insulating material assembly. Becomes

A floor heating apparatus according to a third aspect of the present invention is the floor heating apparatus according to the first or second aspect, wherein the multi-pipe heat exchanger comprises an inner pipe constituting a water passage, and an inner pipe. And an outer tube forming a refrigerant path between the two tubes.

[0013] In this case, heat exchange is performed between water passing through the inner tube of the double tube heat exchanger and a refrigerant passing between the inner tube and the outer tube, and the hot water after the heat exchange is subjected to floor heating. Floor heating can be performed by circulating through the panel.

A floor heating apparatus according to a fourth aspect of the present invention is the floor heating apparatus according to the third aspect, wherein the outer periphery of the inner pipe of the double pipe is provided with a large number of serrated fins. In this case, the heat exchange efficiency inside the double tube heat exchanger can be enhanced by the fins.

A floor heating apparatus according to a fifth aspect of the present invention is the floor heating apparatus according to any one of the first to fourth aspects, wherein the heat insulating material assembly is made of a foamed synthetic resin. In this case, it is easy to configure the shape of the heat insulating material assembly into an arbitrary shape corresponding to the shape of the double-pipe heat exchanger, and the heat insulating material assembly is made of a material having high heat insulation and heat resistance. so,
It is possible to maintain the heat insulation of the double tube heat exchanger at a high level.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Overall Configuration] FIG. 1 shows an overall configuration of a floor heating apparatus to which an embodiment of the present invention is applied.

This apparatus branches a refrigerant circuit of an air conditioner and performs floor heating using the refrigerant in the refrigerant circuit. As the air conditioner, a normal separate type is used, and an outdoor air conditioning unit 100 installed outdoors,
And an indoor air conditioning unit 300 installed indoors. As shown, the indoor air-conditioning unit 300 can employ a ceiling-embedded cassette-type indoor air-conditioning unit 301, a wall-mounted indoor air-conditioning unit 302, and the like.
The indoor air-conditioning unit 300 can also be a built-in type, and a plurality of indoor air-conditioning units can be connected to form a multi-type. A compressor or an outdoor heat exchanger housed in the outdoor air-conditioning unit 100 and an indoor heat exchanger housed in the indoor air-conditioning unit 300 are connected by a refrigerant pipe 150 to perform air conditioning. A first refrigerant circuit is configured.

Above the outdoor air conditioning unit 100, a floor heating unit 200 is installed. Floor heating unit 2
00 is provided with a heat exchanger for performing heat exchange between the refrigerant and the water, and the refrigerant pipe branched from the first refrigerant circuit described above is connected to this heat exchanger for floor heating. Of the second refrigerant circuit.

The floor in the room is provided with, for example, a floor heating panel 400 having a flooring finish 402 on the surface. Inside the floor heating panel 400, a hot water pipe 401 for circulating hot water is provided. The hot water pipe 401 is connected to a heat exchanger in the floor heating unit 200 by a hot water pipe 250 to form a hot water circuit.

[Refrigerant Circuit] FIG. 2 shows a refrigerant circuit in this embodiment. The outdoor air conditioning unit 100 includes a compressor 101, a four-way switching valve 102 connected to the discharge side of the compressor 101, an accumulator 103 connected to the suction side of the compressor 101, and a connection to the four-way switching valve 102. Outdoor heat exchanger 104, liquid branch pipe 107 connected to the outlet side of outdoor heat exchanger 104, gas branch pipe 108 connected to four-way switching valve 102, and connected to liquid branch pipe 107. The apparatus is provided with decompressors 109 and 110 including electric expansion valves, liquid shutoff valves 111 and 112, gas shutoff valves 113 and 114, and the like.

The outdoor air-conditioning unit 100 has an outdoor fan 115 for taking in outdoor air and discharging the air after the heat exchange in order to exchange heat with the refrigerant passing through the inside of the outdoor heat exchanger 104. And an outdoor fan motor 116 for driving the outdoor fan 115.

The indoor air-conditioning unit 300 has an indoor heat exchanger 303 and an indoor heat exchanger 303
An indoor fan 304 for discharging air after heat exchange between the indoor fan 304, an indoor fan motor 305 for driving the indoor fan 304, and a liquid pipe connection port 306
And a gas pipe connection port 307 are provided.

Liquid closing valve 11 of outdoor air conditioning unit 100
2. The gas shutoff valve 114 is connected to the liquid pipe connection port 30 of the indoor air conditioning unit 300 via the refrigerant pipe 150, respectively.
6. By being connected to the gas pipe connection port 307,
This constitutes a first refrigerant circuit for air conditioning.

The floor heating unit 200 includes a double pipe heat exchanger 201, a liquid pipe connection port 202, and a gas pipe connection port 203. As shown in FIG. 5, the double-pipe heat exchanger 201 includes a double pipe 500 in which an inner pipe 502 is inserted into an outer pipe 501. On the outer surface of the inner tube 502, a large number of serrated fins 503 are erected, and the inner tube 50
2 is configured to increase the heat exchange efficiency inside and outside. The inside of the inner tube 502 of the double tube 500 is a hot water path 504 through which water passes, and the space between the inner tube 502 and the outer tube 501 is a refrigerant path 505 through which a refrigerant passes. It becomes possible to heat the water passing through the heat exchange.

A double tube heat exchanger which is bent at both ends in the longitudinal direction of the double tube 500 and spirally overlapped so as to be housed in the floor heating unit 200 and formed into a shape along an oval in plan view. 201 is shown in FIG.

The double-pipe heat exchanger 201 has a heat exchanger body 511 located at an intermediate portion, a water outlet pipe 512 drawn from one end of the inner pipe, and a water outlet pipe 512 drawn from the other end of the inner pipe. A water inlet pipe 513, a liquid pipe 514 drawn from one end of the outer pipe, and a gas pipe 515 drawn from the other end of the outer pipe are provided.

In FIG. 2, the liquid pipe section 514 of the double pipe heat exchanger 201 is connected to the liquid pipe connection port 202, and the gas pipe section 515 is connected to the gas pipe connection port 203.
Further, the liquid shutoff valve 111 and the gas shutoff valve 113 of the outdoor air conditioning unit 100 are connected to the liquid pipe connection port 202 and the gas pipe connection port 203 of the floor heating unit 200, respectively, so that the second refrigerant circuit for floor heating is used. Is composed.

[Hot water circuit] FIG. 3 shows a hot water circuit in this embodiment. Inside the floor heating unit 200, a double-pipe heat exchanger 201, an expansion tank 210 connected to the water outlet pipe 512 of the double-pipe heat exchanger 201, and a circulation pump 211 for circulating water in the path are provided. A forward header 212 for branching an outlet path of water, a hot water shut-off valve 213 for closing a circuit for each branch path, an outlet port 214 provided for each branch path, and an inlet port 2 provided for each branch path.
15 and a return header 216 connected between the inlet port 215 and the water inlet piping section 513 of the double pipe heat exchanger 201.
And

The outlet port 214 of the floor heating unit 200
And the inlet port 215 are connected to the hot water pipe 250, respectively.
Are connected to the hot water pipe 401 of the floor heating panel 400 through the above, and these form a hot water circuit.

The circulation pump 211 circulates the water in the hot water circuit and circulates the refrigerant in the second refrigerant circuit. At this time, the four-way switching valve 102 (see FIG. 2) in the indoor air-conditioning unit 100 is controlled to be at the position indicated by the dotted line, and the high-temperature gas refrigerant is supplied to the double-pipe heat exchanger 201. As a result, water passing through the hot water path 504 (see FIG. 5) of the double tube heat exchanger 201 is heated by the high-temperature gas refrigerant passing through the refrigerant path 505. The heated hot water is supplied to the hot water pipe 401 of the floor heating panel 400 via the outlet port 214 and the hot water pipe 250.

[Floor heating unit] Floor heating unit 200
FIG. 4 is an exploded perspective view showing a schematic configuration of the device. The floor heating unit 200 includes a bottom frame 221 in which a bottom plate and a part of a side plate are integrated, a pipe cover 223, and a top plate 224.
And the like. Inside the casing 225, a double tube heat exchanger 201, an expansion tank 210, a circulating pump 211, an outgoing header 21
2. Hot water circuit components such as a return header 216 are stored.

A water supply port 226 is provided on the upper surface of the expansion tank 210 for supplying water to the hot water circuit during construction and for replenishing water. A tank cap 227 for closing the water supply port 226 is attached. Can be The top plate 224 is provided with a water supply opening 228 at a position corresponding to the water supply port 226 of the expansion tank 210.
A water supply port lid 229 for closing the container 28 is attached.

The circulating pump 211 is fixedly attached to the bottom frame 221. Further, an electrical component box 231 for storing electrical components including a printed circuit board on which a control circuit for controlling each part of the floor heating unit 200 is mounted is mounted inside the bottom frame 221. The electrical component box 231 is configured to prevent water from entering from outside by attaching a drip-proof plate 232 to the upper surface.

The double-tube heat exchanger 201 includes the lower heat insulating member 2
It is covered with a heat insulating material assembly composed of the upper heat insulating member 41 and the upper heat insulating member 242, and is insulated from the surroundings. Next, the structure of the heat insulating material assembly will be described.

[Heat Insulation Assembly] The structure of the heat insulation attached to the double tube heat exchanger 201 is shown in the sectional view of FIG. The heat insulator assembly 240 includes a lower heat insulator 241 and an upper heat insulator 242.

The lower heat insulating member 241 and the upper heat insulating member 242
Are formed in an oval donut shape along the shape of the double tube heat exchanger 201, and
Are formed. In addition, fitting surfaces 245 and 246 are respectively provided on the joint surfaces of the lower heat insulating member 241 and the upper heat insulating member 242.
Are formed, and by fitting the fitting steps 245 and 246, the double tube heat formed by the storage recess 243 of the lower heat insulating member 241 and the storage recess 244 of the upper heat insulating member 242 is formed. Storage space 24 of exchanger 201
7 can be in a sealed state.

The lower heat insulating member 241 and the upper heat insulating member 242
Can be composed of a molded product of a synthetic resin having high heat resistance and heat insulation, and can be composed of, for example, a molded product of heat-resistant foamed polypropylene.

By configuring the double-tube heat exchanger 201 with such a heat insulating material assembly 240, even the double-tube heat exchanger 201 formed along the oval shape can surround the periphery. Heat insulation can be maintained, and the heat exchange efficiency of the double-tube heat exchanger 201 can be maintained high.

The heat insulating material assembly 240 can be easily assembled by fitting the fitting step 245 of the lower heat insulating member 241 and the fitting step 246 of the upper heat insulating member 242. Work becomes easier. Also,
Since the adhesive is not used for attaching the heat insulating material assembly 240, the heat insulating material assembly 240 can be easily removed, so that the maintenance work is facilitated and the recycling is possible.

Further, when the heat insulating material assembly 240 is made of a synthetic resin molded product, the heat insulating material assembly 240 can have an arbitrary shape corresponding to the shape of the double-tube heat exchanger 201. Further, the high-temperature gas refrigerant passes through the double-tube heat exchanger 201 housed inside the heat insulating material assembly 240. However, when the heat insulating material assembly 240 is formed of a heat-resistant foamed polypropylene molded product, Since there is no deterioration with respect to the temperature of the high-temperature gas refrigerant and the dimensional change due to heating is extremely small, the influence on internal components due to thermal deformation can be minimized.

In this embodiment, the heat-insulating material assembly 240 which can be divided into upper and lower parts is shown, but is divided into left and right directions, divided into front and rear directions, divided into three or more pieces, and the like. Can take various forms.

[Expansion Tank] The expansion tank 210 is for absorbing the volume of water in the hot water circuit that expands due to a temperature difference, and also serves as a water supply unit for water supply during construction and water supply. . The configuration of the expansion tank 210 is shown in FIGS. FIG. 8 is a plan view of the expansion tank 210,
FIG. 9 is a right side view thereof.

The expansion tank 210 has a substantially rectangular parallelepiped casing 251 made of a synthetic resin such as polyethylene or polypropylene. Casing 251
Can be configured by integrating the upper casing 252 and the lower casing 253, which are molded products, by heat welding or ultrasonic welding.

A water supply port 226 for supplying water is provided on the upper surface of the casing 251. The water supply port 226 has a size and a shape into which a hose for water supply can be inserted, and may be configured to include a filter for preventing foreign substances from entering the hot water circuit. The filter forms, for example, a bag-shaped dust collecting net with a nonwoven fabric or a chemical fiber and can be attached to a water supply port.

In many cases, such a floor heating device is constructed at the time of new construction. When water is supplied from a water supply installed at a new construction site, chips such as sand and water pipes and other debris are placed in the hot water circuit. May be mixed with water.
When a filter is provided in the water supply port 226, such foreign matter can be prevented from entering the hot water circuit, and the circulating pump 211 and the hot water shutoff valve 213 are not damaged. As such a filter, a disposable filter can be used so as to be used only for water supply during construction. In this case, the filter can be attached to the water supply port 226 with an adhesive or the like so that the filter can be removed after the application.

An inlet 2 for introducing water circulating in the hot water circuit into the casing 251 is provided on a side surface of the casing 251.
54, an outlet 25 for discharging water from the casing 251
5 are provided. As shown in FIG. 3, the inlet 254 of the expansion tank 210 is connected to the water outlet pipe 512 of the double pipe heat exchanger 201, and the outlet 255 is connected to the circulation pump 2.
11 is connected to the suction side.

<Flooding Control Rib> A flood control rib 256 is provided around the water supply port 226 so that other parts such as electrical components do not flood due to water spilled around the water supply port 226 of the expansion tank 251. Have been. The flood control rib 256 is
The water supply port 226 is provided so as to surround the water supply port 226 except for an open part 257 located in the left direction in FIG. 8, and guides water spilled around the water supply port 226 to the outside through the open part 257. It is configured as follows.

As shown in FIG. 10, the expansion tank 210
Is housed in a casing provided with a bottom frame 221, a top plate 224, and the like so that the opening 257 is located at least in a direction away from the electrical component box 231. At this time, the water supply opening 228 of the top plate 224 is provided at a position corresponding to the water supply port 226 of the expansion tank 210.

A water supply port lid 229 is attached to the water supply opening 228 of the top plate 224, and the water supply port 2 of the expansion tank 210 is provided.
A tank cap 227 is attached to 26, and the hot water circuit is maintained in a sealed state.

When supplying water to the expansion tank 210, the water supply port lid 229 attached to the top plate 224 is removed, and
Further, the tank cap 227 attached to the water supply port 226 is removed, and the end of a hose connected to the water supply is inserted into the water supply port 226 to perform a water supply operation.

At this time, when the tip of the hose is inserted into or removed from the water supply port, water may spill around the water supply port 226 from the hose tip, or water may overflow from the water supply port 226 due to an excessive amount of water supply. Can be However, the flood control rib 256 provided around the water supply port 226 restricts the flow of water to the electrical component box 231 side, and the water is guided downward along the side surface of the expansion tank 210 from the opening 257. The Rukoto. Expansion tank 2
When the water guided below 10 reaches the bottom frame 221 (see FIG. 4), it is possible to draw water to the outside by providing a drain hole in the bottom frame 221. .

Therefore, water spilled around the water supply port 226 can prevent the electrical component box 231 from being flooded, and can prevent damage to electronic components such as a control circuit. The positions and shapes of the flood control ribs 256 and the opening portions 257 can be appropriately changed based on the shapes and arrangements of the expansion tank 210 and the electrical component box 231, and are not limited to those illustrated. .

<Dust-collecting recess> As described above, when water is supplied at the time of construction, there is a possibility that sand, chips from water pipes, and other debris may be mixed with water in the hot water circuit.
It is also conceivable that foreign matter such as dust may enter the inside of the hot water pipe 401 during construction. Such foreign matter may damage the circulation pump 211 and the like while circulating in the hot water circuit.

As shown in FIG. 8 and FIG.
On the bottom surface of 0, there is provided a dust collecting recess 261 for collecting foreign matter mixed in water in the hot water circuit. The dust collecting recess 261 is provided near the outlet 255 for discharging water from the inside of the expansion tank 210.

As shown in FIG. 11, the dust collecting concave portion 261 has a front wall portion 262 which is suspended below the outlet 255,
A bottom wall portion 263 located at the lowermost portion, and an inclined wall portion 2 that smoothly continues from the bottom surface of the expansion tank 210 to the bottom wall portion 263
64. Inflow port 25 inside expansion tank 210
The water flowing from 4 toward the outlet 255 generally passes above the dust collecting recess 261 as shown by the arrow A. Foreign matter having a higher specific gravity than water, such as garbage, moves along the inclined wall portion 264 as shown by an arrow B in the dust collecting recess 261.
Will be collected within. Since the front wall portion 262 which rises substantially vertically is formed on the downstream side of the dust collecting concave portion 261, the water in the dust collecting concave portion 261 is not much affected by the water flow of the arrow A, as shown by the arrow C. As a result, the convection remains in the dust collecting recess 261. Therefore, the foreign matter collected in the dust collecting recess 261 along the inclined wall portion 264 is not drawn into the outlet 255 by the water flowing from the inlet 254 to the outlet 255, and enters the dust collecting recess 261. As a result, the foreign matter can be prevented from circulating in the hot water circuit.

As shown in FIG. 12, the dust collecting recess 261 may be provided with a front wall portion 262 located forward of the base of the outlet 255. In this case, the dust collection space 26 located in front of the base of the outlet 255.
The effect of retaining foreign matter in the inside 5 is enhanced, foreign matter in the hot water circuit is efficiently collected, and damage to the circulation pump 211 and the like can be prevented.

<Dust Collection Filter> As shown in FIGS. 13 and 14, a dust collection filter 271 can be provided inside the expansion tank 210 instead of the dust collection recess 261 of the expansion tank 210.

Here, similarly to the expansion tank 210 described above, the upper casing 252 and the lower casing 253, which are molded products, are integrated by heat welding or ultrasonic welding to form a substantially rectangular parallelepiped casing 251. ing.

A water supply port 226 for supplying water is provided on the upper surface of the casing 251, and a flood control rib 256 for preventing flooding of electrical components and the like is provided around the water supply port 226.

An inlet 2 for introducing water circulating in the hot water circuit into the casing 251 is provided on a side surface of the casing 251.
54, an outlet 25 for discharging water from the casing 251
5 are provided.

The internal space of the casing 251 is
26 and a first space 272 including an inlet 254
A dust collection filter 271 is attached so as to be divided into the second space 273 including the outlet 255. The dust collecting filter 271 can be made of a metal net or a synthetic resin net. For example, it is possible to use a polypropylene net that has been subjected to a mildew-proofing treatment with 40 to 60 mesh.

When such a dust collecting filter 271 is attached, foreign matter such as dust is mixed in the supplied water when water is supplied through the water supply port 226 during construction or water supply. Even in this case, foreign matter will be caught on the dust collecting filter 271. In addition, hot water piping 4
Even if dust or the like remains in the inside 01, foreign substances flowing into the expansion tank 210 through the inflow port 254 are prevented from being caught by the dust collection filter 271 and flowing into the hot water circuit again. it can. Therefore, it is possible to prevent the foreign matter from circulating in the hot water circuit, thereby preventing damage to the circulation pump 211 and the like.

It should be noted that the configuration of the dust collecting recess provided on the bottom surface of the expansion tank 210 described above can be used together, and the cause of failure can be reduced as much as possible. <Water surface detecting means> As shown in FIG.
Float switch 28 for detecting water surface position within 0
1 is provided.

The float switch 281 is connected to the expansion tank 2
Float switch mounting opening 2 provided on the upper surface of 10
The upper flange portion 282 is attached to the mounting opening 284 via a packing 283, the stem 285 is suspended from the lower surface of the upper flange portion 282, and the stem 285 is vertically attached. And a limit switch (not shown) that generates a detection signal when the float 286 reaches a predetermined position.

The float 286 has a cylindrical stem 285.
It has a donut shape with a hollow fitting therein, and has a specific gravity smaller than that of water. As a result, the float 286 moves up and down along the stem 285 according to the water level in the expansion tank 210. Also, the float 286
It has a magnetic material composed of permanent magnets inside,
The limit switch is operated at the position of the limit switch provided in the stem 285.

For example, when the water inside the expansion tank 210 reaches a replenishing water level E shown in FIG. A limit switch is arranged at the position, and the limit switch is operated when the float 286 is at this position.

The float switch 281 is connected to the casing 2
Float switch mounting part 28 which is one corner in 51
9. This float switch mounting part 28
9 from the bottom of the casing 251 to isolate the
Is erected. The wave preventing rib 287 is provided on the float switch mounting portion 2 except for a water passage portion 288 for making the water level in the float switch mounting portion 289 equal to that of the other portions.
89 are provided. The height of the breakwater rib 287 is set to a value sufficiently higher than the replenishing water level E in order to prevent erroneous detection and hunting at the replenishing water level E.

The float switch mounting portion 289 has the same water level as the other portion inside the expansion tank 210 through the water passage portion 288, and is configured so as to suppress the waving by the wave preventing rib 287. Therefore,
Float switch 2 at least near make-up water level E
The erroneous detection of 81 and the occurrence of hunting can be suppressed, and it is possible to accurately instruct the user to supply water.

The wave preventing rib 287 is provided between the float switch 281 and the water supply port 226. Therefore, even when water is supplied by inserting the end of the hose into the water supply port 226, the end of the hose is
Thus, the float switch 281 can be prevented from being damaged without contacting the float switch 87 and protruding toward the float switch mounting portion 289.

As the water level detecting means, various means other than the float switch can be used, and it is not limited to the illustrated one.

[0071]

In the floor heating apparatus according to the first aspect of the present invention, the multi-pipe heat exchanger can be completely covered by the heat insulating material assembly, and the heat insulation of the multi-pipe heat exchanger can be maintained at a high level. it can. Further, the heat insulating material assembly can be separated into a lower heat insulating member and an upper heat insulating member, so that it can be easily disassembled and recycled easily.

In the floor heating device according to the second aspect of the present invention,
The multi-pipe heat exchanger accommodated in the floor heating device can be made compact, and the multi-pipe heat exchanger can be reliably insulated by the heat insulating material assembly.

In the floor heating device according to claim 3 of the present invention,
The heat exchange between the water passing through the inner pipe of the double pipe heat exchanger and the refrigerant passing between the inner pipe and the outer pipe is performed. Heating can be performed.

In the floor heating device according to claim 4 of the present invention,
The heat exchange efficiency inside the double tube heat exchanger can be enhanced by the fins. In the floor heating device according to claim 5 of the present invention, it is easy to configure the shape of the heat insulating material assembly into an arbitrary shape corresponding to the shape of the double tube heat exchanger, and the heat insulating property and the heat resistance are high. By making the heat insulating material assembly from the material, it becomes possible to maintain high heat insulation of the double tube heat exchanger.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a floor heating device to which an embodiment of the present invention is applied.

FIG. 2 is a circuit diagram showing an example of the refrigerant circuit.

FIG. 3 is a circuit diagram showing an example of the hot water circuit.

FIG. 4 is an exploded perspective view of the floor heating unit.

FIG. 5 is a sectional view of a double pipe used in a double pipe heat exchanger.

FIG. 6 is a perspective view of a double tube heat exchanger.

FIG. 7 is a cross-sectional view of the heat insulating material assembly.

FIG. 8 is a plan view of an expansion tank.

FIG. 9 is a side view of the expansion tank.

FIG. 10 is a simplified vertical sectional view showing an installation state of an expansion tank.

FIG. 11 is a partial vertical sectional view of an expansion tank.

FIG. 12 is a partial longitudinal sectional view showing another example of the expansion tank.

FIG. 13 is a plan view showing another example of the expansion tank.

FIG. 14 is a side view thereof.

FIG. 15 is a longitudinal sectional view showing an example of a water surface detecting means.

[Explanation of symbols]

 201 Double-pipe heat exchanger 240 Thermal insulator assembly 241 Lower thermal insulator 242 Upper thermal insulator 243 Storage recess 244 Storage recess 245 Fitting step 246 Fitting step 247 Storage space

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L036 AA05 AA06 3L070 AA02 BB14 BC02 BC11 BC12 BC26 DD02 DG01 DG05 DG06 3L103 AA01 AA37 BB42 CC02 CC30 DD06 DD10 DD33 DD38 DD70

Claims (5)

[Claims] 1. A compressor (101), an outdoor heat exchanger (104) functioning as an evaporator, and a refrigerant path (505) forming a refrigerant circuit together with the compressor (101) and the outdoor heat exchanger (104). ) And a water passage path (504) through which water passes, and a multi-tube heat exchanger (20) for performing heat exchange between the refrigerant and water passing through each path.
1), a hot water pipe (401) disposed on the floor in the room and passing hot water after heat exchange in the multi-tube heat exchanger (201), and a water passage of the multi-tube heat exchanger (201) A circulation pump (211) for circulating water between the (504) and the hot water pipe (401); a lower heat insulating member (241) covering a lower part of the multi-tube heat exchanger (201); A heat insulator assembly (240) comprising an upper heat insulating member (242) covering an upper portion of the vessel (201). 2. The multi-tube heat exchanger (201) has a substantially elliptical shape bent at both left and right ends and polymerized a plurality of times, and the heat insulating material assembly (240) is connected to the multi-tube heat exchanger (20).
The floor heating device according to claim 1, wherein the floor heating device has an oval donut shape corresponding to the shape of (1). 3. The multi-tube heat exchanger (201) constitutes a refrigerant passage (505) between the inner tube (502) constituting the water passage (504) and the inner tube (502). An outer tube (501) and a double tube (500),
The floor heating device according to claim 1. 4. The underfloor heating device according to claim 3, wherein the outer circumference of the inner pipe (502) of the double pipe (500) is provided with a large number of serrated fins (503). 5. The floor heating device according to claim 1, wherein said heat insulating material assembly (240) is made of a foamed synthetic resin.