JP2000220912A - Refrigerant heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a refrigerant heater which is provided to refrigerant piping so as to quickly heat the refrigerant, and miniaturize the device. SOLUTION: A refrigerant heater comprises a heating portion 16a in which at least one portion of refrigerant piping 20 is rendered to be a magnetic material, a coil 16b which is wound around the outer circumferential surface of the heater portion 16a, and a high frequency power source 16c which is connected to the coil 16b, all of which contribute to constitute the device as a magnetic induction heating type. Though the device is small, refrigerant can be instantly heated to have a high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant heating device, and more particularly to a heating device attached to a refrigerant pipe so as to heat the refrigerant flowing through the refrigerant pipe.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. Hei 5-223194 discloses this type of refrigerant heating device. This refrigerant heating device is provided in a pipe on the discharge side of the compressor in the refrigerant circuit, and is used as an auxiliary heater or the like during a heating operation.

[0003] This refrigerant heating device is composed of a hollow cylindrical body and a helical heater wire built in the cylindrical body, and is configured such that a refrigerant pipe is passed through the cylindrical body. Then, when electricity is supplied to the heater wire, the heat of the heater wire, which generates heat by electric resistance, is transmitted to the refrigerant via the refrigerant pipe.

[0004]

However, since this refrigerant heating device uses a resistance heating type heater, there is a problem that the heating time until reaching a predetermined temperature is long and controllability is poor. In addition, since a tubular body containing a spiral heater wire is mounted on the refrigerant pipe, there is a problem in that the apparatus becomes large in order to obtain a sufficient amount of heat for heating the refrigerant.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to enhance controllability by configuring a refrigerant heating device provided in a refrigerant pipe so that the refrigerant can be quickly heated, and It is to downsize.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the refrigerant heating device is of an electromagnetic induction heating type, whereby the refrigerant can be quickly heated to a high temperature and the size can be reduced.

Specifically, a first solution of the present invention is to provide a refrigerant heating device comprising: a heat generating portion (16a) having at least a part of a refrigerant pipe (20) in a longitudinal direction made of a magnetic material; Heating section
(16a) and a coil (16b) wound around the coil (16a).
b) is provided with a high-frequency current generating means (16c) connected to the coil (16b) so as to supply a high-frequency current to the heating section (16a) and supply an eddy current to the heating section (16a).

[0008] A second solution taken by the present invention is:
A coil wound around the refrigerant pipe (20) with the refrigerant heating device
(16b), an iron core (16e) located inside the coil (16b) inside the refrigerant pipe (20), and a high-frequency current supplied to the coil (16b) so that an eddy current flows through the iron core (16e). The coil (16
b) and a high-frequency current generating means (16c) connected to (b).

Further, a third solution taken by the present invention is:
In the second solution, at least a portion of the refrigerant pipe (20) around which the coil (16b) is wound is configured as a heat generating portion (16a) formed of a magnetic material.

[0010] A fourth solution taken by the present invention is:
An iron core fixed inside the refrigerant pipe (20) with the refrigerant heating device
(16e) and the refrigerant pipe (20) wound around the iron core (16e).
And a high-frequency current generating means (16c) connected to the coil (16b) so as to supply a high-frequency current to the coil (16b) and cause an eddy current to flow through the iron core (16e). And a configuration provided with:

Further, a fifth solution taken by the present invention is:
In the fourth solution, at least a portion of the refrigerant pipe (20) located outside the coil (16b) is configured as a heat generating portion (16a) formed of a magnetic material.

Further, a sixth solution taken by the present invention is:
In the first, third, or fifth solving means, the heating unit
(16a) is constituted by a heat generating layer (16h, 16j) of a magnetic material formed on the outer peripheral surface of the refrigerant pipe (20), and the refrigerant pipe (20) has a higher heat conductivity than the heat generating layer (16h, 16j). It is made of a material having high hardness. For example, the heat generating layer is preferably a thin layer made of a ferromagnetic material such as iron, and the refrigerant pipe (20) is preferably a copper pipe (20b) having a high thermal conductivity.

[0013] A seventh solution taken by the present invention is:
In the sixth solution, the heat generating layer is provided with a refrigerant pipe (20).
It is composed of a magnetic material foil (16h) wound around the outer peripheral surface of the magnetic head.

An eighth solution taken by the present invention is:
In the sixth solution, the heat generating layer is provided with a refrigerant pipe (20).
It is constituted by fitting a pipe (16j) of a thinner magnetic material to the outer peripheral surface of the refrigerant pipe (20).

In the first solution, when a high-frequency current flows from the high-frequency current generating means (16c) to the coil (16b), a high-frequency magnetic field is generated around the coil. Therefore, an eddy current is generated in the heat generating portion (16a) of the refrigerant pipe (20) by the electromagnetic induction action, and the heat generating portion (16a) is instantly heated to a high temperature. And the heating part (1
6a) is transmitted to the refrigerant, and the refrigerant is quickly heated.

[0016] In the second and fourth solving means,
When a high-frequency current flows from the high-frequency current generating means (16c) to the coil (16b), an eddy current is generated in the iron core (16e) due to a high-frequency magnetic field generated around the coil (16b), and the iron core (16e) is instantaneously moved. Heated to high temperatures. Then, the heat of the iron core (16e) is transmitted to the refrigerant, and the refrigerant is quickly heated.

Further, in the third and fifth solving means,
When a high-frequency current is applied from the high-frequency current generating means (16c) to the coil (16b), the high-frequency magnetic field generated around the coil (16b) causes not only the iron core (16e) but also the heating part (16a) of the pipe (20). An eddy current is generated, and the iron core (16e) and the heat generating portion (16a) are instantly heated to a high temperature. Then, the iron core (16e) and the heating part (1
6a) is transmitted to the refrigerant, and the refrigerant is quickly heated.

In the case of the electromagnetic induction heating method, generally, a heating section is generally used.
Heat is transmitted from the surface of (16a), and the heat is transmitted to the inside. However, in the sixth to eighth solving means, the heat generating portion (16a)
Is composed of a heat generating layer (16h, 16j) of a thin magnetic material, and the heat generating layer (16h, 16j) is formed on the outer peripheral surface of a refrigerant pipe (20) such as a copper pipe (20b) having a high thermal conductivity. Heating section (16a)
Compared to the case of using relatively thick iron (low thermal conductivity) pipes, the heat on the surface side of the heat generating portion (16a) is transmitted to the inner surface of the refrigerant pipe (20) with almost no loss. As a result, the inner surface of the heat generating portion (16a) is sufficiently heated.

[0019]

According to the first aspect of the present invention, the refrigerant can be quickly and strongly heated by utilizing the characteristics of the electromagnetic induction heating system using high-frequency current. In addition, sufficient heat can be obtained even with a small size. In addition, at least a portion of the pipe (20) is
6a) and a part of the refrigerant heating device, the refrigerant heating device is wound around a coil (16b) around the heat generating portion (16a),
It is possible to provide a simple configuration in which only a high-frequency current flows through the coil (16b).

Further, according to the second and fourth means, since the iron core (16e) is used, it is not necessary to provide the refrigerant pipe (20) with the heat generating portion (16a). As such, normal piping can be used. According to the fourth solution in particular, both the iron core (16e) and the coil (16b) are provided with refrigerant pipes.
Since it is located inside (20), the whole can be further reduced in size, and all the heat-generating portions of the refrigerant heating device are in contact with the refrigerant, so that heat can be more efficiently transmitted to the refrigerant.

Further, according to the third and fifth solutions, both the iron core (16e) and the heat generating portion (16a) of the pipe (20) generate heat, and the heat generating area increases. Heat can be transferred more efficiently.

According to the sixth to eighth solutions, a ferromagnetic material such as iron is provided around a refrigerant pipe (20) formed of a material having a high thermal conductivity such as a copper pipe (20b). Since the formed thin heat generating layer (16h, 16j) is formed as the heat generating portion (16a), the inner surface of the refrigerant pipe (20) can be sufficiently heated, and the heat can be efficiently transmitted to the refrigerant. For this reason, the temperature of the heat generating portion (16a) can be relatively lowered, which is also effective in energy saving.

[0023]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

First, a refrigeration system (1) incorporating the refrigerant heating device (16) of the first embodiment will be described with reference to FIG. This refrigeration system (1) is configured as an air conditioner including an outdoor unit (1a) and an indoor unit (1b). The compressor (10), the outdoor heat exchanger (11) and the expansion valve (12) in the outdoor unit (1a), and the indoor heat exchanger (13) in the indoor unit (1b) are connected to the refrigerant pipe ( The refrigerant circuit (21) is connected in order by 20) to form a refrigerant circuit (21).

The compressor (10) and the two heat exchangers (11, 13) are connected via a four-way switching valve (22) so that a heating operation and a cooling operation can be switched. Figure 1 shows a four-way switching valve
The state where (22) is switched to the heating operation side is shown. At this time, the indoor heat exchanger (13) acts as a condenser, and the outdoor heat exchanger (11) acts as an evaporator. An outdoor blower (14) is provided in the outdoor unit (1a), and an indoor blower (15) is provided in the indoor unit (1b).

In the refrigerant circuit (21), the refrigerant flowing between the expansion valve (12) and the outdoor heat exchanger (11) is heated so as to heat the refrigerant flowing through the refrigerant pipe (20) during the defrost operation. A heater (16), which is an apparatus, is provided. In addition, outdoor heat exchanger (11)
Is provided with a frost sensor (17) for detecting frost on the outdoor heat exchanger (11) during the heating operation.

Outdoor blower (14), indoor blower (15), heater
(16) and the frost formation sensor (17) are connected to the controller (18). When the controller (18) detects the frost formation of the outdoor heat exchanger (11) by the frost sensor (17) during the heating operation, the heater (16) continues the operation of the compressor (10) in the normal cycle.
Is operated to perform the defrost operation. At this time, both blowers (14, 15)
It stops under the control of 8).

Next, the configuration of the heater (16) will be described with reference to FIG. This heater (16) is an electromagnetic induction heating type heater. Specifically, the heater (16) is connected to the refrigerant pipe (2
(0) a heating part (16a) formed of a magnetic material;
A coil (16b) wound around the coil (16a), and a high-frequency current connected to the coil (16b) so as to supply a high-frequency current to the coil (16b) and to cause an induction current to flow through the heat generating portion (16a). A high frequency power supply (16c) as a generating means. In this configuration, the heat generating portion (16a) forms a part of the refrigerant pipe (20), and at the same time, is a component of the heater (16).

The heat generating portion (16a) can be formed by, for example, joining a cylindrical body made of a magnetic material to the refrigerant pipe (20) or winding a thin plate of a magnetic material around the refrigerant pipe (20). The coil (16b) is entirely covered with a heat insulating material (16d).

In general, the higher the frequency of the high-frequency current used, the higher the heating efficiency can be increased. However, since excessive heat generation is unnecessary, the amount of heat required for heating the refrigerant and the conditions such as the size and material of the heat-generating portion are required. In consideration of the above, an appropriate range may be selected.

-Operation- Next, the operation of the refrigeration system will be described.

At the time of the heating operation shown in FIG.
The refrigerant is compressed in (10). The high-temperature and high-pressure refrigerant exiting the compressor (10) enters the indoor heat exchanger (13), exchanges heat with indoor air, condenses, and is cooled. Warm air is supplied into the room by this heat exchange, and the room is heated.

On the other hand, the refrigerant then enters the expansion valve (12) and is decompressed, and then exchanges heat with outdoor air in the outdoor heat exchanger (11) to evaporate and returns to the compressor. Thereafter, the above heating cycle is repeated.

In this heating operation, the outdoor heat exchanger (11)
When frost forms, frost formation is detected by the frost formation sensor (17),
The defrost operation is started by the controller (18).
At this time, a high-frequency current flows through the coil (16b) of the heater (16), and a high-frequency magnetic field (F) is generated around the high-frequency current. with this,
An eddy current (C) is generated in the heat generating portion (16a) of the pipe (20), the heat generating portion (16a) is instantly heated to a high temperature, and the heat of the heat generating portion (16a) is transmitted to the refrigerant.

During the defrosting operation, the operation of the compressor (10) is continued with the heating cycle, so that the refrigerant pipe (2)
0) The refrigerant flowing inside is heated by the heater (16) and then sent into the outdoor heat exchanger (11). Then, the frost of the outdoor heat exchanger (11) is melted by the heat of the heated refrigerant.

In the first embodiment, since both blowers (14, 15) are stopped during the defrost operation, heat exchange is not performed in both heat exchangers (11, 13). Therefore, the refrigerant is not cooled in the indoor heat exchanger (13), and
It will be heated quickly in 6). During the defrost operation, it is also possible to operate the indoor blower (15), so that the outdoor unit (1a) side heats the outdoor unit (1a) while blowing hot air from the indoor unit (1b) to continue heating. The defrost of (11) can be executed.

On the other hand, when performing the cooling operation, the four-way switching valve
(22) is switched to the cooling side, and the refrigerant is sent from the compressor (10) to the outdoor heat exchanger (11), the expansion valve (12), and the indoor heat exchanger (13) in this order, so that cold air can be supplied to the room. Become like

According to the first embodiment, since the electromagnetic induction heating type heater (16) is used as the refrigerant heating device, the refrigerant can be quickly and strongly heated, and the controllability can be improved. . Furthermore, since the electromagnetic induction heating type heater (16) can obtain a sufficient amount of heat even if it is small, the apparatus can be downsized. In addition, since the heat generating portion (16a) is provided in a part of the refrigerant pipe (20), the coil (16b) is wound around the heat generating portion (16a) by the refrigerant heating device (16).
(16b) It is possible to adopt a simple configuration in which only a high-frequency current flows.

[0039]

Second Embodiment Next, a second embodiment of the refrigerant heating device will be described with reference to FIG. Embodiment 2
In this embodiment, an iron core (16e) is provided in the heater (16) of the first embodiment. The iron core (16e) is not limited to iron, and is made of a rod-shaped member made of a magnetic metal. And iron core (16e)
Is fixed inside the refrigerant pipe (20) by the support member (16f), and is held inside the coil (16b) along the longitudinal direction of the pipe (20).

In the second embodiment, when a high-frequency current is applied to the coil (16b) of the heater (16), a high-frequency magnetic field (F) generated around the coil causes the heat to be applied to both the heat-generating portion (16a) and the iron core (16e). Since an eddy current (C) is generated, the heating part (16a) and the iron core (1
6e) generates heat, and the heat of the heater (16) is transmitted to the refrigerant from the heat generating portion (16a) and the iron core (16e). As described above, according to the second embodiment, since the heat generation area is larger than that of the first embodiment, the refrigerant can be heated more quickly.

-Modification of Embodiment 2- When the iron core (16e) is provided inside the refrigerant pipe (20) as in the second embodiment, the refrigerant pipe (20) does not need to be provided with the heat generating portion (16a). Good. Even without the heat generating portion (16a), the heat of the heater (16) is transmitted from the iron core (16e) to the refrigerant, so that the refrigerant can be sufficiently efficiently heated.

[0042]

Third Embodiment Next, a third embodiment of the refrigerant heating device will be described with reference to FIG.

This refrigerant heating device includes an iron core (16e) fixed by a support member (16f) inside a refrigerant pipe (20), and a refrigerant core wound around the iron core (16e) and positioned inside the refrigerant pipe (20). And a high frequency power supply (16c) connected to the coil (16b).

The iron core (16e) is formed by spirally winding a thin plate of a magnetic material, and although not shown, an inner end and an outer end are electrically connected. In addition, this iron core (1
6e) may use a rod-shaped member made of a magnetic material as shown in FIG.

A wiring hole (20a) is formed in a part of the refrigerant pipe (20), and a coil (16b) and a high frequency power supply (16c) are connected by a lead wire (16g) passing through the wiring hole (20a). It is connected. The wiring hole (20a) is sealed after wiring, and is processed so that refrigerant does not leak.

With this configuration, when a high-frequency current flows through the coil (16b), the iron core (16e) generates heat and the heater (1b) generates heat.
The heat of 6) can be quickly transmitted from the iron core (16e) to the refrigerant. Further, in the present embodiment, since the entire heat generating portion of the heater (16) is incorporated in the refrigerant pipe (20), all the heat generating portions come into contact with the refrigerant, and the heating efficiency can be increased. Moreover, in the third embodiment, the coil (16b) is not wound around the refrigerant pipe (20), so that the entire structure can be made smaller.

Modification of Embodiment 3 In the configuration shown in FIG. 4, the refrigerant pipe (20) has at least a heat generating portion made of a magnetic material (see FIGS. 2 and 3) at a portion located outside the coil (16b). (See (16a)). Then, in the heater (16) of the third embodiment, heat can be more efficiently transmitted to the refrigerant, and the refrigerant can be heated more quickly.

[0048]

Embodiment 4 Next, Embodiment 4 of the refrigerant heating device will be described with reference to FIG.

In the refrigerant heating device (16), the configuration of the heat generating portion (16a) in the first embodiment is specifically specified. That is, in the first embodiment, the heat generating portion (16a) is configured such that a cylindrical body (for example, an iron pipe) made of a magnetic material is joined to a part of the refrigerant pipe (20), or a thin plate material of the magnetic material is connected to the refrigerant pipe (20). Although it has been described that the configuration can be formed by winding, the fourth embodiment employs the latter configuration.

More specifically, the refrigerant pipe (20) is formed using a copper pipe (20b) having a high thermal conductivity, and the heat generating portion (16a) is made of a ferromagnetic material around the copper pipe (20b). An iron foil (16h) is wound at least one or more times around to form a thin continuous heat generating layer in the circumferential direction. In the figure, iron foil (16h) is replaced with copper tube (20h).
Although shown apart from b), the iron foil (16h) is actually in close contact with the copper tube (20b). Then, a coil (16b) is wound around a heating section (16a) made of the iron foil (16h),
A high frequency power supply (16c) is connected to (16b) to form a heater (16).

In the above configuration, when a high-frequency current flows from the high-frequency power supply (16c) to the coil (16b), an eddy current is generated in the heat-generating portion (16a), and the heat-generating portion (16a) is instantaneously heated.
Generally, in an electromagnetic induction heating type heater, a heating portion (16a)
Is heated from the surface side (coil (16b) side). In the fourth embodiment, since the thin iron foil (16h) is used for the heating section (16a), the heating section (16a) is ) Can be considered to generate heat almost uniformly in the entire thickness direction, or the heat of the surface is transmitted to the inner surface of the iron foil (16h) with almost no temperature drop. Then, the copper tube (20b) located inside the heat generating portion (16a) is heated with the heat generated by the heat generating portion (16a).

Since the copper tube (20b) has a high thermal conductivity, the heat generating portion
Due to the heat transmitted from (16a), it is heated to a high temperature from the outer surface side to the inner surface side. In other words, a configuration in which an iron pipe having a thickness similar to that of the copper pipe (20b) constituting the refrigerant pipe (20) is joined to a part of the copper pipe (20b) to form the heat generating portion (16a) of the heater (16). Considering that, since the thermal conductivity of copper is considerably larger than that of iron, the copper tube (2) of the fourth embodiment using the iron foil (16h) and the copper tube (20b) is used.
0b) is higher than the temperature of the inner surface of the iron tube when a thick iron tube is used as the heat generating portion (16a).
6a) when the surface temperature is the same). Therefore, copper tubing (20b)
When the heat generating portion (16a) is formed by wrapping an iron foil (16h) around it, heat loss can be suppressed and heat can be efficiently transmitted to the refrigerant. For this reason, in the fourth embodiment, the heating unit
Even if the surface temperature of (16a) is relatively low, the refrigerant can be sufficiently heated.

In the above-described configuration in which the iron tube is joined to a part of the copper tube (20b) as the heat generating portion (16a), for example, to reduce the thickness of the iron tube in order to reduce the loss of heat, However, there is a problem in terms of practicality.

-Effects of the Fourth Embodiment- As described above, in the fourth embodiment, a thin layered heat generating portion (16a) is formed by winding an iron foil (16h) around a copper tube (20b). Therefore, in addition to the effect of the first embodiment,
The inner surface of the refrigerant pipe (20) can be more sufficiently heated by the heat of 6a), and as a result, the heating efficiency of the refrigerant is improved.
Further, this makes it possible to lower the temperature of the heater (16) itself, so that there is also an energy saving effect. In addition, a thin iron foil (16h) around the copper tube (20b) with high thermal conductivity
With the double structure, the refrigerant pipe (20) does not need to be made thinner than necessary, and the pipe strength does not decrease.

Modification of Fourth Embodiment FIG. 6 shows a first modification of the fourth embodiment. In this example, in the heater (16) of FIG. 5, the periphery of the iron foil (16h) is covered with a heat insulating material (16i), and a coil (16b) is wound around the periphery. Other configurations are shown in FIG.
And the description is omitted.

According to this structure, the heat of the heat generating portion (16a) generated by applying a high-frequency current to the coil (16b) is prevented from being released to the surroundings. Therefore, in addition to the effect similar to that of the example of FIG. 5, heat is reliably transmitted to the copper tube (20b), so that the refrigerant can be more efficiently heated.

FIG. 7 shows a second modification of the fourth embodiment. In this example, a copper tube (2
Instead of forming an exothermic part (16a) by wrapping an iron foil (16h) around 0b), the exothermic part (16a) is constituted as an exothermic layer by a thin iron tube (16j). In the figure, the iron pipe (1
6j) is exaggerated in the drawing.
Is used which is sufficiently thinner than the copper tube (20b) and can transmit heat from the surface to the inner surface without much loss of heat. Then, heat insulation (16i) is applied around the iron pipe (16j).
And a coil (16b) wound thereon.

Even with this configuration, the refrigerant can be efficiently heated through the copper tube (20b) while suppressing the heat of the heat generating portion (16a) from being released to the surroundings.

[0059]

Other Embodiments of the Invention The present invention may be configured as follows with respect to the above embodiment. For example, in the above embodiment, the heater (16) is connected to the expansion valve (12) and the outdoor heat exchanger.
(11) An outdoor heat exchanger that is placed during heating operation
Although the refrigerant is heated at the time of defrosting in (11), a heater (16) is arranged between the compressor (10) and the indoor heat exchanger (13) to provide an auxiliary heater during the heating operation. May be used.

In the fourth embodiment and its modifications, the surface of the refrigerant pipe (20) such as the copper pipe (20b) is placed on the surface of the iron foil (16).
h) and the example in which the heat generating portion (16a) is formed from the thin iron tube (16j), the heat generating portion (16a) may be formed by, for example, plating or other methods. ) Is not limited to a specific structure or material as long as it is constituted as a thin layer of a magnetic material.

Embodiment 4 in which the heat-generating portion (16a) is specified
The configuration described above is also applicable to the case where the heat generating portion (16a) is provided in the refrigerant heating device of the second embodiment or the refrigerant heating device of the third embodiment.

[Brief description of the drawings]

FIG. 1 is a schematic circuit configuration diagram of a refrigeration apparatus using a refrigerant heating device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a refrigerant heating device according to the first embodiment.

FIG. 3 is a schematic configuration diagram of a refrigerant heating device according to a second embodiment.

FIG. 4 is a schematic configuration diagram of a refrigerant heating device according to a third embodiment.

FIG. 5 is a schematic configuration diagram of a refrigerant heating device according to a fourth embodiment.

FIG. 6 is a view showing a first modification of the refrigerant heating device of FIG. 5;

FIG. 7 is a view showing a second modification of the refrigerant heating device of FIG. 5;

[Explanation of symbols]

 (1) Air conditioner (refrigerator) (1a) Outdoor unit (1b) Indoor unit (10) Compressor (11) Outdoor heat exchanger (12) Expansion valve (13) Indoor heat exchanger (14) Outdoor blower ( 15) Indoor blower (16) Heater (refrigerant heating device) (16a) Heating part (16b) Coil (16c) High frequency power supply (high frequency current generating means) (16d) Insulation material (16e) Iron core (16f) Support member (16g) Lead wire (16h) Iron foil (heating layer) (16i) Insulation material (16j) Iron tube (heating layer) (17) Frost sensor (18) Controller (20) Refrigerant piping (20a) Wiring hole (21) Refrigerant circuit ( 22) Four-way switching valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Tomohiro Yabu Inventor 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Sakai Works Kanaoka Plant

Claims (8)

[Claims] 1. A refrigerant heating device for heating a refrigerant flowing through a refrigerant pipe (20), comprising: a heat-generating part (16a) having at least a part of the refrigerant pipe (20) in a longitudinal direction made of a magnetic material; A coil (16b) wound around the heating section (16a); and a coil (16b) which supplies a high-frequency current to the coil (16b) and causes an eddy current to flow through the heating section (16a).
And a high-frequency current generating means (16c) connected to the refrigerant heater. 2. A refrigerant heating device for heating a refrigerant flowing in a refrigerant pipe (20), comprising: a coil (16b) wound around the refrigerant pipe (20); and a coil (16b) inside the refrigerant pipe (20). ) Iron core (16
e) and a high-frequency current is supplied to the coil (16b) to
e) a high-frequency current generating means (16c) connected to the coil (16b) so that an eddy current flows through the refrigerant heating apparatus. 3. The refrigerant pipe (20) is provided with at least a coil (16).
3. The refrigerant heating device according to claim 2, wherein the wound part of b) is configured as a heat generating part (16a) formed of a magnetic material. 4. A refrigerant heating device for heating a refrigerant flowing in a refrigerant pipe (20), comprising: an iron core (16e) fixed inside the refrigerant pipe (20);
A coil (16b) wound around the coil (16e) and positioned inside the refrigerant pipe (20); and a coil (16b) for supplying a high-frequency current to the coil (16b) and flowing an eddy current to the iron core (16e). ) Is connected to the high-frequency current generating means (16c). 5. The refrigerant pipe (20) is provided with at least a coil (16).
The refrigerant heating device according to claim 4, wherein the portion located outside of (b) is configured as a heat generating portion (16a) formed of a magnetic material. 6. The heat generating portion (16a) is constituted by a heat generating layer (16h, 16j) of a magnetic material formed on the outer peripheral surface of the refrigerant pipe (20), and the refrigerant pipe (20) is formed by a heat generating layer (16h, 16h). The refrigerant heating device according to claim 1, 3 or 5, wherein the refrigerant heating device is made of a material having a higher thermal conductivity than 16j). 7. The refrigerant heating device according to claim 6, wherein the heat generating layer is formed of a magnetic material foil (16h) wound around an outer peripheral surface of the refrigerant pipe (20). 8. The refrigerant heating device according to claim 6, wherein the heat generating layer is formed by fitting a pipe (16j) of a magnetic material thinner than the refrigerant pipe (20) to an outer peripheral surface of the refrigerant pipe (20). apparatus.