JP2007285639A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact heat exchanger improving a heat exchange amount. <P>SOLUTION: The heat exchanger is provided with a casing 11 passing a first fluid (water), and an inner tube 17 passing a second fluid (a coolant). It is characterized by that the inner tube 17 is arranged in the casing 11, and a heat sink 18 is provided adhered to the inner tube 17. Thereby, heat exchange between the first fluid (the water) and the second fluid (the coolant) can be carried out without making a dead space in a center part, and the heat exchange amount can be improved by the heat sink 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger of a heat pump hot water supply apparatus.

  Conventionally, a heat pump hot water supply apparatus is composed of a refrigerant circuit and a hot water supply circuit.

FIG. 6 is a block diagram of a conventional heat pump water heater, and FIG. 7 is a block diagram of a water-refrigerant heat exchanger of the conventional heat pump water heater. As shown in FIG. 6, a refrigerant circuit in which a water-refrigerant heat exchanger 101, a decompression means 102, an evaporator 103, and a compressor 104 are sequentially connected in an annular manner through a refrigerant pipe, a water-refrigerant heat exchanger 101, water It comprises a hot water supply circuit in which a pump 105 and a hot water storage tank 106 are sequentially connected in an annular shape by piping. In addition, as shown in FIG. 7, the water-refrigerant heat exchanger 101 has a water flow path 107 and a refrigerant flow path 108, and the cross-sectional shapes of the water flow path 107 and the refrigerant flow path 108 are flat. The roads are arranged in parallel, are in thermal contact with each other, and are stacked and wound (for example, see Patent Document 1).
JP 2002-107069 A

  However, in the above-described conventional configuration, as shown in FIG. 7, the water channel 107 and the refrigerant channel 108 are in thermal contact via the contact surface 109, but on one side of the refrigerant channel 108 and one side of the water channel 107. However, the heat transfer area was limited, and it was difficult to obtain a large amount of heat exchange.

  Moreover, the hollow part 110 is formed in the center part of the water-refrigerant heat exchanger 101 wound by the spiral shape, and it is a dead space. Therefore, the heat pump unit has a problem that the size is increased.

  This invention solves the said conventional subject, and it aims at providing a compact heat exchanger while raising the amount of heat exchange.

  In order to solve the conventional problems, a heat exchanger according to the present invention includes a housing through which a first fluid flows and an inner tube through which a second fluid flows, and the inner tube is disposed in the housing. In addition, a heat radiating plate in close contact with the inner tube is provided.

  This eliminates the dead space of the heat exchanger and increases the amount of heat exchange.

  While increasing the amount of heat exchange, a compact heat exchanger can be provided.

  A heat exchanger according to a first aspect of the present invention includes a housing through which a first fluid circulates and an inner tube through which a second fluid circulates, and the inner tube is disposed in the housing and is in close contact with the inner tube. By providing the heat radiating plate, the inner pipe through which the second fluid circulates is disposed inside the casing through which the first fluid circulates. Heat exchange can be performed between the second fluids, and the heat exchange amount can be increased by the heat radiating plate.

  In the heat exchanger of the second invention, in particular, in the first invention, the flow path is provided in the housing, and the inner pipe is disposed along the flow path, whereby the first fluid and the second fluid are disposed. Can realize efficient heat exchange.

  A heat exchanger according to a third aspect of the present invention is a relatively heavy object, particularly in the first or second aspect of the present invention, because the casing has a substantially box shape and a heat sink is disposed at the bottom of the casing. Since the heat sink is arranged at the bottom, the center of gravity becomes the lower part, and the heat exchanger can be stably disposed, so that the installation property is improved.

  The heat exchanger according to the fourth aspect of the present invention is, in particular, in the first or second aspect of the invention, the casing is substantially cylindrical, and the heat sink is disposed at the bottom of the casing, so that the top is cylindrical. As a result, the pressure applied to the casing of the first fluid that circulates inside becomes uniform, so that the pressure resistance is improved and a relatively heavy heat sink is arranged at the bottom, so that the center of gravity becomes the lower part, and the heat Since the exchanger can be disposed stably, installation is also improved.

  The heat exchanger of the fifth invention is the heat exchanger between the first fluid and the second fluid, particularly in any of the first to fourth inventions, because the inner tube is branched into a plurality of parts in the housing. Since the exchange amount increases, heat exchange can be performed over a wide range in a shorter time.

  In the heat exchanger according to the sixth aspect of the invention, in particular, in any of the second to fifth aspects of the invention, the first fluid and the second fluid are opposed to each other, so that efficient heat exchange can be performed.

  The heat exchanger according to a seventh aspect of the present invention is the heat exchanger of any one of the first to sixth aspects, wherein the first fluid is water and the second fluid is a refrigerant, and the refrigerant inlet is more than the water outlet, the water inlet, and the refrigerant outlet. Since the heat is not easily escaped from the upper part of the housing by being disposed at a low position, the heat exchange efficiency can be improved.

  In the heat exchanger of the eighth invention, in particular, in the seventh invention, since the refrigerant is carbon dioxide, the refrigerant is pressurized to a critical pressure or higher, so the heat is deprived by the water of the heat exchanger and the temperature is increased. Even if it falls, it will not condense and it will become easy to form the temperature difference between a refrigerant | coolant and water in the whole heat exchanger, Therefore Hot water is obtained and heat exchange efficiency can be made high. Furthermore, since carbon dioxide is relatively inexpensive and stable, it is possible to reduce product cost and improve reliability. In addition, since the ozone depletion coefficient is zero and the global warming coefficient is as low as about 1700 of the alternative refrigerant HFC-407C, a product that is friendly to the global environment can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a heat pump water heater in the first embodiment of the present invention. In FIG. 1, the heat pump water heater in Embodiment 1 includes a water-refrigerant heat exchanger 1, a decompression means 2, an evaporator 3, and a compressor 4 that are sequentially connected in an annular manner through a refrigerant pipe, and a water-refrigerant. The heat exchanger 1 is composed of a water pump 5 which is a means for conveying water, and a hot water supply circuit 10 in which a hot water storage tank 6 for storing hot water is sequentially connected in an annular shape by piping. In the water-refrigerant heat exchanger 1, refrigerant and water are used. Exchange heat with. In the present embodiment, carbon dioxide is used as the refrigerant. Hot water stored in the hot water storage tank 6 is supplied to the user from the hot water supply terminal 7 through a faucet or a shower.

FIG. 2 is a perspective view of the water-refrigerant heat exchanger in the first embodiment of the present invention, and FIG. 3 is an AA cross-sectional view of the water-refrigerant heat exchanger in the first embodiment of the present invention. 2 and 3, the water-refrigerant heat exchanger 1 forms a flow path through which water flows using a passage wall 12 in a substantially rectangular parallelepiped housing 11, and a hot water supply pipe is provided at the water inlet. Water inlet part 13 so that it can be connected, water outlet part 14 so that it can be connected to a hot water supply pipe at the outlet of water, refrigerant inlet part 15 so that it can be connected to a refrigerant pipe at the inlet of the refrigerant, refrigerant pipe at the outlet of the refrigerant The refrigerant outlet 16 is provided so that it can be connected.

  Further, an inner pipe 17 through which a refrigerant flows is disposed in the housing 11 along a water flow path formed by the passage wall 12, and water and the refrigerant exchange heat with each other. . A heat radiating plate 18 is disposed at the bottom of the housing 11 in close contact with the inner tube.

  FIG. 4 is a BB cross-sectional view of the water-refrigerant heat exchanger according to the first embodiment of the present invention. In FIG. 4, the inner pipe 17 is distributed by the distributor 19 so that the refrigerant flowing from the refrigerant inlet 15 is divided into three flow paths.

  About the water-refrigerant heat exchanger comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the water flowing into the water-refrigerant heat exchanger from the water inlet portion 13 circulates inside the housing 11 along the flow path formed by the passage wall 12 and exits from the water outlet portion 14. On the other hand, the carbon dioxide refrigerant compressed to a high temperature by the compressor 4 flows from the refrigerant inlet 15, circulates in the inner pipe 17 distributed by the distributor 19, and the water circulated in the housing 11. It exits from the refrigerant outlet 16 while exchanging heat. At this time, since the refrigerant and water temperatures are refrigerant outlet portion> water inlet portion, refrigerant inlet portion> water outlet portion, the water inlet / outlet portion is disposed above the refrigerant inlet / outlet portion, so that heat is generated. It can be transmitted efficiently. Further, since the heat radiating plate 18 is disposed in close contact with the inner tube 17, the heat held by the refrigerant is efficiently transmitted to the water, and the heat hardly escapes from the ceiling of the water-refrigerant heat exchanger, Increases heat exchange efficiency.

  Moreover, in this Embodiment, the heat exchange efficiency between water and a refrigerant | coolant becomes high by making the distribution direction of a refrigerant | coolant and the distribution direction of water into a counterflow.

  Further, in the present embodiment, since the inner tube 17 is branched into three flow paths inside the housing 11, the area for heating water increases and a wider range of water can be heated in a short time. it can. Furthermore, since the heat radiating plate 18 is disposed at the bottom of the housing 11 so as to be in close contact with the inner tube 17, heat transfer is promoted and the inner tube 17 is stabilized by fixing the inner tube 17. By disposing the heat sink 18 which is disposed and is relatively heavy at the bottom, the heat exchanger itself is also stably installed. In the present embodiment, the inner pipe 17 is branched into three flow paths, but this is not limited to three. In the present embodiment, the shape of the casing 11 is a substantially rectangular parallelepiped shape, but may be a substantially cylindrical shape. In this case, the pressure of the water flowing through the inside can be uniformly dispersed. Therefore, the pressure resistance performance is improved.

  FIG. 5 shows another embodiment of the heat sink 18. As shown in FIG. 5, by providing the heat radiating plate 18 with the concavo-convex portion 20, the heat exchange area increases, water is disturbed, and the heat exchange efficiency increases.

  As described above, in the present embodiment, it is possible to provide a compact heat exchanger that eliminates dead space while improving heat exchange efficiency.

As described above, the heat exchanger according to the present invention includes an integrated heat pump water heater in which a heat pump cycle and a hot water supply cycle are integrally formed, a separate heat pump water heater configured separately, and a heat exchanger for hot water supply. It can be applied to water-refrigerant heat exchangers of various heat pump water heaters such as direct hot water heat pump type hot water heaters that can heat hot water heated in hot water as it is, and in addition to hot water supply function, heat pump device with bathtub hot water supply, heating function, and drying function It can also be applied to.

Configuration diagram of heat pump water heater in Embodiment 1 of the present invention The perspective view of the heat exchanger in Embodiment 1 of this invention Sectional view AA of the heat exchanger in Embodiment 1 of this invention BB sectional drawing of the heat exchanger in Embodiment 1 of this invention Sectional drawing of the other Example of the heat exchanger in Embodiment 1 of this invention Configuration diagram of conventional heat pump water heater Configuration diagram of conventional heat exchanger

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water-refrigerant heat exchanger 2 Pressure reducing means 3 Evaporator 4 Compressor 5 Water pump 6 Hot water storage tank 7 Hot water supply terminal 9 Refrigerant circuit 10 Hot water supply circuit 11 Housing 12 Passage wall 13 Water inlet part 14 Water outlet part 15 Refrigerant inlet part 16 Refrigerant outlet part 17 Inner pipe 18 Heat sink 19 Distributor 20 Uneven part

Claims (8)

A housing in which the first fluid circulates and an inner tube in which the second fluid circulates, the inner tube being disposed in the housing, and a heat radiating plate in close contact with the inner tube. Heat exchanger. The heat exchanger according to claim 1, wherein a flow path is provided in the housing, and an inner pipe is disposed along the flow path. The heat exchanger according to claim 1 or 2, wherein the casing has a substantially box shape, and a heat radiating plate is disposed at a bottom portion of the casing. The heat exchanger according to claim 1 or 2, wherein the casing has a substantially cylindrical shape, and a heat radiating plate is disposed at the bottom of the casing. The heat exchanger according to any one of claims 1 to 4, wherein the inner pipe is branched into a plurality of parts within the housing. The heat exchanger according to any one of claims 2 to 5, wherein the first fluid and the second fluid are alternating current. The first fluid is water, the second fluid is refrigerant, and the refrigerant inlet is disposed at a position lower than the water outlet, the water inlet, and the refrigerant outlet. The heat exchanger as described in. The heat exchanger according to claim 7, wherein the refrigerant is carbon dioxide.

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