JP2008070045A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger with high capacity by increasing a fin pitch of one portion more than a fin pitch of another portion, and increasing an air volume passing between fins. <P>SOLUTION: In the fin tube type heat exchanger 2 formed into a substantially L-shape and carrying out heat exchange between a coolant and air, the fin pitch of one portion is increased more than the fin pitch of the other portion, to be specific, a fin pitch of a bent part or a fin pitch of an end are increased more than other portions. Accordingly, the air capacity passing through the fins 5 is increased, and the capacity can be improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air heat exchanger that performs heat exchange between refrigerant and air in a refrigeration circuit.

  FIG. 6 shows a heat exchanger 10 according to the prior art. As this type of conventional air heat exchanger, for example, there is one as described in FIG. 6 (see, for example, Patent Document 1).

  A conventional heat exchanger 10 is constituted by a fin tube type heat exchanger in which a plurality of fins 5 arranged in parallel at equal pitches and heat transfer tubes 6 are arranged in a penetrating state, and its planar shape is substantially L-shaped. It is formed to become.

  The reason why it is formed in a substantially L shape is to take in air as a heat source from the two side surfaces of the heat pump unit 1 in order to improve the heat exchange capability. Accordingly, the heat transfer tube 6 is also formed by being bent into a substantially L shape.

The heat transfer tube 6 is U-shaped, and is inserted through the fin 5 from the short side before the heat exchanger 10 is formed into an L shape, and is formed into an L shape after insertion. Further, a U bend 7 formed by connecting ends of long side portions of the L shape is used.
Japanese Patent Laid-Open No. 10-300275

  FIG. 4 is a characteristic diagram of the wind speed distribution in the conventional heat exchanger 10, and FIG. 5 is a relationship diagram between the conventional fin area and the heat exchange capability, which will be described with reference to these drawings.

  In the above prior art, the wind speed passing through the fins 5 of the heat exchanger 10 is not substantially uniform. As shown in FIG. 4, the substantially L-shaped bends C, D, E and short parts A, J of the heat exchanger 10 have a lower wind speed than the other parts. Since the gap between the fins 5 becomes narrower toward the leeward in the substantially L-shaped bent part, and the short part A and J part are in the wind path position with a bend than the fan 3 suction part, both of them are ventilation resistance Increases and the wind speed decreases.

  Further, as shown in FIG. 5, the fin pitch is reduced at the same fan speed, the fin interval is reduced, and the heat exchanger capacity is increased. However, if the point Y is further reduced, the point X It goes down like this.

  This is because when the fin pitch is decreased, the heat transfer area is increased, while the airflow resistance is increased, so that the air volume is decreased. Therefore, up to the point Y, the effect due to the increase in the heat transfer area is large and the capacity of the heat exchanger 10 is increased. However, when the fin pitch is smaller than the point Y, the heat transfer resistance on the air side is increased due to the decrease in the air volume, and Will decline.

  That is, since the fins 5 of the heat exchanger 10 are installed at an equal pitch, the substantially L-shaped bends C, D, E and short parts A, J cause a decrease in the air volume compared to other parts, There has been a problem that the heat transfer resistance increases, leading to a decrease in capacity.

The present invention solves the above-described conventional problems, and provides a heat exchanger with high performance by increasing the air volume passing through the fins by increasing the fin pitch of one part larger than the fin pitch of the other part. It is aimed.

  In order to solve the above-mentioned problems, a heat exchanger according to the present invention is a fin-tube heat exchanger formed in a substantially L-shape for heat exchange between refrigerant and air. It is characterized by increasing the volume, and the air volume passing through the fins can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, by making the fin pitch of one part larger than the fin pitch of another part, the air volume which passes a fin can be increased and a heat exchanger with high capability can be provided.

  A first aspect of the present invention is a fin-tube heat exchanger formed in a substantially L shape that exchanges heat between refrigerant and air, wherein a fin pitch of one part is made larger than a fin pitch of another part. The capacity of the heat exchanger can be increased by increasing the amount of air passing through the fins.

  The second invention is the first invention, and is characterized in that the fin pitch of the bent portion is made larger than the fin pitch of the other portion, and heat exchange is performed by increasing the amount of air passing through the fin of the bent portion. Can increase the capacity of the vessel.

  The third invention is characterized in that, in particular, in the second invention, the fin pitch at the end is made larger than the fin pitch at the other part, and heat exchange is performed by increasing the amount of air passing through the fin at the end. The capacity of the vessel can be increased.

(Embodiment 1)
Hereinafter, the air heat exchanger 2 according to Embodiment 1 will be described with reference to the drawings. FIG. 1 is a plan view of a heat pump unit 1 equipped with an air heat exchanger 2 according to an embodiment of the present invention, and FIG. 2 is a front view. FIG. 3 is a system diagram of a heat pump water heater according to an embodiment of the present invention.

  The heat pump unit 1 and the hot water storage tank 13 constitute an air heat source heat pump type heat pump water heater. The heat pump unit 1 includes an air heat exchanger 2, a blower 3, a compressor 4, a radiator 11, and a decompression unit 12. The air flow indicated by the arrow caused by the blower 3 passes between the fins 5.

  The air heat exchanger 2 is composed of a fin tube type heat exchanger in which a plurality of fins 5 arranged in parallel with heat transfer tubes 6 arranged in a penetrating state, and its planar shape is substantially L-shaped as shown in FIG. It is formed so as to be in a shape. The reason why it is formed in a substantially L shape is to take in air as a heat source from the two side surfaces of the heat pump unit 1 in order to improve the heat exchange capability. Accordingly, the heat transfer tube 6 is also formed by being bent into a substantially L shape.

  The heat transfer tube 6 is U-shaped, and is inserted through the fin 5 from the short side before the heat exchanger 2 is formed in an L shape, and is formed in an L shape after insertion. Further, a U bend 7 formed by connecting ends of long side portions of the L shape is used.

  And the pitch of the fin 5 installed in the bending part of the air heat exchanger 2 currently formed in the substantially L shape and the edge part of the air heat exchanger 2 is compared with the pitch of the fin 5 installed in the other part. Is getting bigger.

  In addition, the present apparatus includes a hot water storage tank 13 in which low temperature hot water and high temperature hot water are stored in a layered state, and a heat pump 1 as a heating source for heating the hot water. The water is heated and boiled to store hot water and use it for hot water supply. Further, it is composed of a tank unit 18 composed of water-related parts such as a hot water storage tank 13 and a heating source by the heat pump 1.

  First, the configuration and operation of the heat pump 1 that is a heating source will be described. The heat pump 1 includes a compressor 4 that compresses a refrigerant, a radiator 11 that cools the refrigerant, a decompression unit 12 that decompresses the refrigerant, and an air heat exchanger 2 that evaporates and evaporates the refrigerant. The heat pump 1 is connected to the decompression means 12 through the radiator 11 from the discharge side of the compressor 4, and further connected to the suction side of the compressor 4 through the air heat exchanger 2.

  Further, in the heat pump 1, carbon dioxide is used as the refrigerant, and the refrigerant compressed by the compressor 2 enters the radiator 11 as a high-temperature and high-pressure supercritical refrigerant, and radiates and cools it here. . Thereafter, the pressure is reduced by the decompression means 12 to form low-temperature and low-pressure wet steam, and the air heat exchanger 2 exchanges heat with the atmosphere to evaporate and return to the compressor 4.

  At this time, the amount of air passing through the fins 5 is increased by making the pitch of a part of the fins 5, in particular, the bent portions and the fins 5 at the end portions substantially larger than the pitches of the fins 5 of the other parts. The evaporation capability of the air heat exchanger 2 can be improved.

  On the other hand, the configuration and operation of the tank unit 18 related to boiling water will be described. In the tank unit 18, the boiling pipe 14 is connected to the radiator 11 of the heat pump 1 from the lower part of the hot water storage tank 13 and is connected to the upper part of the hot water storage tank 13. The upper part of the hot water storage tank to which the boiling pipe 14 is connected is sufficient if the hot water is on the high temperature layer side of the hot water storage tank 13, and the lower part of the hot water storage tank 13 is if the hot water is on the low temperature layer side of the hot water storage tank. Good.

  In order to send hot water from the hot water storage tank 13 to the heat pump 1 and return it to the hot water storage tank 13, a boiling pump 17 capable of arbitrarily changing the output is provided in the middle of the boiling pipe 14.

  In addition, an incoming water temperature sensor 15 that detects the temperature of the low hot water before heating in the heat pump 1 is raised in the vicinity of the inlet side of the radiator 11 of the boiling pipe 14, and a hot water temperature sensor 16 that detects the temperature of the heated hot hot water is raised. The pipe 14 is provided in the vicinity of the outlet of the radiator 11.

  Regarding the configuration and operation related to hot water supply, a water supply pipe 19 for supplying water from a water supply source is connected to the bottom of the hot water storage tank 13, and the pressure is reduced to an appropriate pressure by a pressure reducing valve 20 from the water supply source and supplied to the water supply pipe 19. .

  A hot water supply pipe 21 for discharging hot water stored in the hot water storage tank 13 and using it for hot water supply is connected to the upper part of the hot water storage tank 13, and a water supply bypass pipe 22 from the water supply pipe 19 is connected in the middle thereof. Also, a hot water mixing valve 23 capable of mixing high temperature water from the hot water supply pipe 21 and low hot water from the water supply bypass pipe 22 at an arbitrary ratio is provided.

  A hot water supply temperature sensor 25 is provided downstream of the hot water supply mixing valve 23 to detect the mixed hot water supply temperature, and a hot water supply end 24 typified by a faucet shower is connected to the tip thereof.

  As described above, in the air heat exchanger according to the present invention, the fin pitch of one part is made larger than the fin pitch of the other part. Useful as a heat exchanger.

1 is a top view of a heat pump unit equipped with an air heat exchanger according to Embodiment 1 of the present invention. Front view of heat pump unit equipped with the same air heat exchanger System diagram of the heat pump water heater (A) Top view of a conventional heat exchanger (b) Characteristic diagram of wind speed distribution in a conventional heat exchanger Relationship between fin area and heat exchange capacity Top view of a heat pump unit equipped with a conventional air heat exchanger

Explanation of symbols

2 Air heat exchanger 5 Fin

Claims (3)

A fin-tube heat exchanger formed in a substantially L shape for heat exchange between refrigerant and air, wherein a fin pitch of a part is made larger than a fin pitch of another part. The heat exchanger according to claim 1, wherein the fin pitch of the bent portion is made larger than the fin pitch of the other portion. The heat exchanger according to claim 1 or 2, wherein the fin pitch at the end is made larger than the fin pitch at the other part.

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