JP4207895B2 - Heater - Google Patents

Description

  The present invention relates to a heater mounted on a heat pump type air conditioner, which can heat a refrigerant or water and improve heating capacity.

  Conventionally, a defrosting method of a heat pump air conditioner equipped with a heater has been implemented as a high heating capacity compared to a defrosting method in which a four-way valve is switched and a refrigerant in a refrigeration cycle is flowed in the reverse direction. .

  FIG. 2 is a configuration diagram of a refrigeration cycle of a conventional air conditioner.

As shown in the figure, in a heat pump refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, an expansion mechanism, and an outdoor heat exchanger are connected by a refrigerant circuit, the expansion mechanism and the outdoor heat in the refrigeration cycle Connecting between the exchangers and the suction side of the compressor, connecting a refrigerant heating circuit having a heater, a discharge side of the compressor in the refrigeration cycle, the outdoor heat exchanger, and the four-way valve A circuit for defrosting, and when performing defrosting of the outdoor heat exchanger during heat pump operation of the refrigeration cycle, after the refrigerant heated by the heater passes through the compressor, the indoor heat The flow through the exchanger and the flow through the outdoor heat exchanger are branched from the defrosting circuit, and the branched refrigerant flows merge at the inlet of the refrigerant heating circuit and are heated again by the heater. Invention that is configured is disclosed as (e.g., see Patent Document 1).
JP-A-11-182994

  However, this refrigeration cycle system has the following problems.

  In the configuration of this refrigeration cycle, when performing the defrosting operation, the two-way valve 109 a is opened, and the refrigerant discharged from the compressor 101 flows between the outdoor heat exchanger 103 and the four-way valve 102.

  And in such a refrigerating cycle structure, in order to perform defrosting while continuing heating operation, there existed the structural subject that a heater will become large sized.

  This invention is made | formed in view of such a problem which a prior art has, and it aims at providing the heater which can improve the heating performance of an air conditioner.

  In order to achieve the above object, a heater of the present invention has an electrothermal heater part and a pipe spirally wound around the heater part, and a metal around the heater part and the pipe. It is characterized by being filled or covered with metal.

  Thereby, the thermal conductivity between the heater part and the pipe is improved, heat can be efficiently transferred to the refrigerant flowing in the pipe, the refrigerant temperature is sufficiently increased, and the heating capacity can be improved.

  The heater of the present invention is compact and has sufficient refrigerant heating capability, and can improve the heating capability of the installed refrigeration cycle.

  A first invention is a heater that is mounted on a heat pump refrigeration cycle and heats refrigerant or water by a heater, and the heater is wound around an electrothermal heater portion and its periphery in a spiral shape. And has a pipe through which refrigerant or water flows, and the heater and the pipe are filled with metal or covered with metal.

  In the second invention, in particular, the heater portion of the first invention is bent at least twice in the vicinity of both ends of the heater and disposed inside the heater.

  In the third aspect of the invention, particularly in an arbitrary cross section of the heater of the first to second aspects of the invention, the heater portion is arranged so that the distances to the pipes wound around the circumference are substantially the same. It is.

  In the fourth aspect of the invention, in particular, either or both of a temperature sensor for detecting the temperature of the heater and an overheat protection device are provided on the surface of the casing of the heater of the first to third aspects of the invention. is there.

  In the fifth aspect of the invention, in particular, a temperature sensor or an overtemperature protection device is disposed on the surface of the casing where the distance from the heater portion inside the fourth aspect of the invention to the casing surface of the heater is minimum. .

  In the sixth aspect of the invention, a temperature sensor or an overtemperature protection device is provided on the surface of the casing of the heater closest to the portion where the heater portion of the fourth aspect of the invention is bent.

  In the seventh aspect of the invention, in particular, the vicinity of the heater section and piping of the first to sixth aspects is filled with a heat transfer fluid.

  In the eighth invention, particularly when the heaters of the first to seventh inventions are installed, the piping extends in the lateral direction of the casing.

  In the ninth aspect of the invention, in particular, when the heater of the eighth aspect of the invention is installed, the pipe located below is the refrigerant inlet and the pipe located above is the refrigerant outlet.

  In the tenth aspect of the invention, particularly when the heaters of the first to ninth aspects of the invention are installed, the casing of the heater is inclined to one side.

  In an eleventh aspect, the metal constituting the casing of the first to tenth aspects is aluminum, iron, brass, or an alloy thereof.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a configuration diagram of a heater according to the present invention.

  In the figure, (a) is a front view of the heater, (b) is a plan view thereof, and (c) is a side view thereof.

  The casing 1 of the heater is made of metal, and the inside thereof may be filled with the same metal, may be filled with a plurality of types of metals, or may be filled with metal and liquid. .

  A heater portion 2 extends from the end surface 9 of the housing 1 and continues into the housing 1. The heater unit 2 is bent in the bent portion 6 and the bent portion 7 inside the housing 1 and stored in the housing 1.

  A leg portion 8 is provided at the lower portion of the housing 1 and placed on an installation stand or the like (not shown).

  In addition, a pipe 4 around the heater portion 2 and inside the housing 1 for flowing heat of refrigerant or water to obtain heat is arranged spirally.

  Refrigerant or water flows in from the inlet pipe 3 of the pipe and flows out from the outlet pipe 5.

  The heater unit 2 receives electric energy and generates heat.

  At this time, the casing 1 is heated by the heat generated from the heater unit 2, the pipe 4 that is in close contact with the metal part or the fluid part of the heated casing 1 is heated, and the refrigerant flowing inside the pipe 4 or Heat the water.

  Then, while flowing from the inlet pipe 3 to the outlet pipe 5, the refrigerant or water is heated to a predetermined temperature.

  Next, a detailed configuration of the arrangement of the heater part and a mechanism that can improve the heating efficiency by making it compact will be described with reference to FIG.

  FIG. 1C is a side view of the heater, and a pipe 4 is wound in a circular shape in a cross section inside the housing 1.

  And the heater part 2 is arrange | positioned by four places (2a-2d) by the cross section inside.

  The distance between 2a to 2d and the pipe 4 is substantially the same d regardless of the portion, and the heat generated by the heater can uniformly heat the pipe 4 in any part of the pipe 4, so that the refrigerant or water The efficiency of heating is improved.

  Moreover, since the heater part is bent at least three times or more (three times in FIG. 1), the dimension in the longitudinal direction of the heater 1 can be made compact.

  Moreover, since the circumference | surroundings of the heater part 2 and the piping 4 are filled with the metal or the fluid, heat conductivity is large and heating efficiency can be improved.

  In addition, since heat energy can be stored in the metal part, the temporal temperature change of the refrigerant or water when the heater starts and stops can be kept small, and the start-up property after startup and after defrosting is increased. It can contribute to the improvement of the heating capacity.

  Next, a temperature sensor or an overtemperature protection device attached to the heater 1 will be described.

  Since the heater 1 has a configuration in which the heater portion 2 and the pipe 4 are disposed inside and the periphery thereof is covered with metal, the temperature rise on the housing surface is large.

  For this reason, a temperature sensor or an overheat protection device for protecting the overheat is necessary.

  At this time, the temperature sensor or the overheat protection device should be disposed at the maximum temperature position, but the place where the distance between the heater unit 2 and the surface of the housing 1 is closest (in FIG. 1). 12 places) or a place where the heater temperature is most stable (11 places in FIG. 1).

  Further, since the heater has the highest temperature at the center of the effective length, the position of 12 is desirable for that reason.

  In addition, the refrigeration cycle has a wide operating temperature range, and it is sufficiently conceivable that the atmosphere of the heater 1 is under conditions that cause condensation.

  Therefore, the housing of the heater 1 is tilted, and water condensed on the surface can be guided in a direction opposite to the exposed portion of the heater unit 2 to prevent adverse effects such as a short circuit.

  As described above, since the heater of the present invention can efficiently heat the refrigerant or water, it can also be applied to heaters for other fluids.

The block diagram of the heater of Embodiment 1 concerning this invention Configuration diagram of an air conditioner equipped with a conventional heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heater 2 Heater part 3 Inlet pipe 4 Piping 5 Outlet pipe 6 Bending part 7 Bending part 8 Leg part 9 End part 10 Side part 11 Sensor attaching part 12 Sensor attaching part

Claims (11)

A heater that is mounted on a heat pump refrigeration cycle and that heats refrigerant or water with a heater, the heater being wound in a spiral manner around an electrothermal heater section and its surroundings within a housing of the heater And the inside of the heater section and the pipe is filled with the same metal as the casing of the heater or a plurality of types of metals, or a metal and a liquid. In addition, the heater section has a portion bent a plurality of times and a linear portion, and the central axis of the linear portion is substantially equal to the cylindrical surface drawn by the spiral of the pipe. A heater characterized by being provided in the above. 2. The heater according to claim 1, wherein the heater portion is bent at least twice in the vicinity of both end portions of the heater and disposed inside the heater. The heater part is arrange | positioned so that the distance to the piping wound and arrange | positioned around the circumference | surroundings may be substantially the same in the arbitrary cross sections of a heater. The heater as described in. 4. The temperature sensor according to claim 1, wherein either or both of a temperature sensor that detects the temperature of the heater and an overheat protection device are disposed on the surface of the casing of the heater. 5. Heater. The heater according to claim 4, wherein a temperature sensor or an overtemperature protection device is provided on the outer surface of the casing around which the pipe is wound. 5. The heater according to claim 4, wherein a temperature sensor or an overtemperature protection device is disposed on a side surface of the casing of the heater close to a portion where the heater portion is bent. The heater according to any one of claims 1 to 6, wherein the vicinity of the heater part and the piping is filled with a heat transfer fluid. The heater according to claim 1, wherein when the heater is installed, the pipe extends in a lateral direction of the casing. 9. The heater according to claim 8, wherein when the heater is installed, a pipe located below is a refrigerant inlet and a pipe located above is a refrigerant outlet. The heater according to any one of claims 1 to 9, wherein when the heater is installed, the casing of the heater is inclined to one side. The metal which comprises a housing | casing is aluminum, iron, or brass and these alloys, The heater in any one of Claims 1-10 characterized by the above-mentioned.

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