JP5180716B2 - Heat exchanger and hot water supply apparatus using the same - Google Patents

Description

  The present invention relates to a heat exchanger used as a water heat exchanger of a heat pump hot water supply apparatus and a hot water supply apparatus using the heat exchanger, for example.

  Conventionally, this type of heat pump type hot water supply apparatus has a heating unit that heats hot water supply water by a heat pump circuit and a tank unit that stores hot water generated by the heating unit, and supplies the hot water of the tank unit to a bathtub or a kitchen. What was made to do is known (for example, refer patent document 1).

  The heating unit of this hot water supply apparatus includes a refrigerant circuit composed of a compressor, an evaporator, a water heat exchanger (gas cooler), etc., heats hot water supply water with the water heat exchanger, and supplies it to the tank unit via the hot water pipe. I am doing so. The water heat exchanger of the hot water supply apparatus includes an inner pipe through which the high-temperature refrigerant of the heat pump circuit circulates and an outer pipe in which the inner pipe is disposed, and hot water is supplied between the inner pipe and the outer pipe. By circulating, the refrigerant and the hot water supply water are configured to exchange heat through the inner pipe.

By the way, when the so-called scale (for example, calcium carbonate) mainly composed of calcium or magnesium contained in hot water supply water is easily attached to the inner pipe and the outer pipe, the refrigerant and the hot water supply water are counterflowed. In particular, there is a problem in that the scale adheres firmly and accumulates on the downstream side (high temperature side) of hot water for hot water, and hinders the flow of hot water for hot water. Therefore, conventionally, the entire outer pipe or only the downstream side is formed by a pipe having a large diameter, so that a sufficient cross-sectional area of flow between the inner pipe and the outer pipe is secured, and even if scale is deposited, Distribution is not hindered.
JP 2006-46877 A

  However, if the entire outer tube or only the downstream side is formed of a tube having a large diameter, there is a problem in that the type and cost of the tube used as the material of the outer tube increase and productivity is lowered.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to effectively prevent the flow inhibition due to the accumulation of scale without forming the entire outer tube or only the downstream side with a tube having a large diameter. An object of the present invention is to provide a heat exchanger that can be prevented and a hot water supply device using the same.

In order to achieve the above object, the present invention includes a heat-conductive inner tube that circulates a first heat medium, and an outer tube having an inner tube disposed therein, and the first tube is disposed between the inner tube and the outer tube. In the heat exchanger configured to exchange heat between the first heat medium and the second heat medium through the inner pipe by circulating the second heat medium, the outside of the second heat medium upstream of the second heat medium. The diameter of the tube and the diameter of the outer tube on the downstream side of the second heat medium are configured to be equal, and the number of inner tubes on the downstream side of the second heat medium is equal to that on the upstream side of the second heat medium. The number of inner pipes is less than the number of inner pipes.

Accordingly, the diameter of the outer pipe on the upstream side of the second heat medium is equal to the diameter of the outer pipe on the downstream side of the second heat medium, and the number of inner pipes on the downstream side of the second heat medium is the upstream side. Since the number of inner pipes is smaller than the number of inner pipes, a larger cross-sectional area is ensured between the outer pipe and the inner pipe on the downstream side of the second heat medium than between the outer pipe and the inner pipe on the upstream side. For example, even if a scale is deposited on the downstream side of hot water as the second heat medium, the distribution of the second heat medium is not hindered. Moreover, since the number of the inner pipes on the upstream side of the second heat medium is larger than that on the downstream side, the second heat medium is sufficiently heated by the inner pipe on the upstream side.

  According to the present invention, it is possible to ensure a larger flow cross-sectional area between the outer pipe and the inner pipe on the downstream side of the second heat medium than between the outer pipe and the inner pipe on the upstream side. Even if the entire pipe or only the outer pipe on the downstream side is not formed by a pipe having a large diameter, it is possible to effectively prevent the flow inhibition in the outer pipe on the downstream side due to the accumulation of scale. Therefore, since the kind and cost of the pipe used as the material of the outer pipe are not increased, productivity can be improved. In this case, since the second heat medium can be sufficiently heated by the inner pipe on the upstream side of the second heat medium, there is an advantage that the overall heat exchange efficiency is not lowered.

  1 to 5 show an embodiment of the present invention. FIG. 1 is a schematic configuration diagram of a heat pump type hot water supply apparatus, FIG. 2 is a schematic configuration diagram of a first water heat exchanger, and FIG. 3 is a plan view thereof. 4 is a side view thereof, and FIG. 5 is a cross-sectional view in the direction of arrows XX in FIG.

  The heat pump type hot water supply apparatus shown in FIG. 1 circulates a refrigerant circuit 10 that circulates refrigerant, a first hot water supply circuit 20 that circulates hot water supply water, a second hot water supply circuit 30 that circulates hot water supply water, and bathtub water. Bath circuit 40, first water heat exchanger 50 for exchanging heat between the refrigerant in refrigerant circuit 10 and the hot water supply water in first hot water supply circuit 20, and the hot water supply water and bathtub circuit 40 in second hot water supply circuit 30 And a second water heat exchanger 60 for exchanging heat with the bathtub water, and the first water heat exchanger 50 constitutes the heat exchanger of the present invention.

  The refrigerant circuit 10 is formed by connecting the compressor 11, the expansion valve 12, the air heat exchanger 13, and the first water heat exchanger 50. The compressor 11 → the first water heat exchanger 50 → the expansion valve 12 → The refrigerant is circulated in the order of the air heat exchanger 13 → the compressor 11. The refrigerant used in the refrigerant circuit 10 is a natural refrigerant such as carbon dioxide.

  The first hot water supply circuit 20 is formed by connecting a hot water storage tank 21, a first pump 22, and a first water heat exchanger 50. The hot water storage tank 21 → the first pump 22 → the first water heat exchanger 50. → Hot water supply water is circulated in the order of the hot water storage tank 21. A water supply pipe 23 and a second hot water supply circuit 30 are connected to the hot water storage tank 21, and hot water supplied from the water supply pipe 23 flows through the first hot water supply circuit 20 through the hot water storage tank 21. . The hot water storage tank 21 and the bathtub 41 are connected via a flow path 25 provided with a second pump 24, and the hot water in the hot water storage tank 21 is supplied to the bathtub 41 by the second pump 24. ing.

  The second hot water supply circuit 30 is connected to the hot water storage tank 21, the third pump 31 and the second water heat exchanger 60. The hot water storage tank 21 → the second water heat exchanger 60 → the third pump 31. → Hot water supply water is circulated in the order of the hot water storage tank 21.

  The bathtub circuit 40 is formed by connecting the bathtub 41, the fourth pump 42, and the second water heat exchanger 60. The bathtub 41 → the fourth pump 42 → the second water heat exchanger 60 → the bathtub 41. The water for bathtubs is circulated in order.

  The first water heat exchanger 50 is connected to the refrigerant circuit 10 and the first hot water supply circuit 20, and is connected to the refrigerant as the first heat medium flowing through the refrigerant circuit 10 and the second hot water circuit 20. Heat exchange is performed with hot water supply water as a heat medium. The first water heat exchanger 50 includes a first heat transferable first and second inner pipes 51 and 52 through which a refrigerant flows, and a first and second inner pipes 51 and 52 disposed therein. And a pair of first end headers 55 to which one ends of the first and second inner pipes 51 and 52 are connected, respectively, and the first and second outer pipes 53 and 54, 54, a pair of second end headers 56 each connected to one end, a first intermediate header 57 to which the other ends of the first and second inner pipes 51 and 52 are connected, and first and second The inner pipes 51 and 52 and the outer pipes 53 and 54 are wound in a spiral shape. In this case, two first inner pipes 51 are arranged in the first outer pipe 53, and four second inner pipes 52 are arranged in the second outer pipe 54.

  Each first end header 55 is connected to the refrigerant circuit 10 and is connected to an inflow pipe 55a and an outflow pipe 55b of the refrigerant, respectively. In this case, the first inner pipes 51 are connected in parallel to the first end header 55 on the inflow side, and the second inner pipes 52 are connected to the first end header 55 on the outflow side. Connected in parallel. Each second end header 56 is connected to the first hot water supply circuit 20, and an inflow pipe 56 a and an outflow pipe 55 b are connected to the hot water supply water, respectively. In this case, each second inner pipe 52 penetrates through the second end header 56 on the inflow side, and each first inner pipe 51 penetrates through the second end header 56 on the outflow side. ing.

  The first intermediate header 57 includes a pair of header portions 57a and a communication pipe 57b that connects the header portions 57a to each other. The first inner pipes 51 are connected in parallel to one header portion 57a. The second inner pipes 52 are connected in parallel to the other header portion 57a. In this case, the first intermediate header 57 is connected to the first and second inner pipes 51 and 52 from the same direction. First and second outer pipes 53 and 54 are connected to the second intermediate header 58 from the same direction, and the first and second inner pipes 51 and 52 pass therethrough, respectively.

  Further, the first inner tube 51 and the first outer tube 53 have a winding part A1 wound from the outside to the inside and a winding part A2 wound from the inside to the outside, two above and below. The pipes of the winding parts A1 and A2 are formed so as to be continuous by shifting the pipes in the vertical direction inside the winding parts A1 and A2. The second inner tube 52 and the second outer tube 54 have a winding part A2 wound from the inside to the outside and a winding part A1 wound from the outside to the inside in two upper and lower stages. The pipes of the winding parts A1 and A2 are formed so as to be continuous by shifting the pipes in the vertical direction inside the winding parts A1 and A2. The winding portions A1 and A2 of the first inner tube 51 and the first outer tube 53 are arranged above the winding portions A1 and A2 of the second inner tube 52 and the second outer tube 54, respectively. The parts A1 and A2 are arranged in four upper and lower stages.

  The second water heat exchanger 60 is connected to the second hot water supply circuit 30 and the bathtub circuit 40 and exchanges heat between the hot water supply water of the second hot water supply circuit 30 and the bathtub water of the bathtub circuit 40. ing.

  The hot water supply apparatus includes a heating unit 70 in which the refrigerant circuit 10 and the first water heat exchanger 50 are arranged, a hot water storage tank 21, a first pump 22, a second pump 24, and a second hot water supply circuit 30. The tank unit 80 in which the fourth pump 42 and the second water heat exchanger 60 are arranged is provided, and the heating unit 70 and the tank unit 80 are connected via the first hot water supply circuit 20.

  In the hot water supply apparatus configured as described above, the high-temperature refrigerant in the refrigerant circuit 10 and the hot water for the first hot water supply circuit 20 are heat-exchanged by the first hydrothermal exchanger 50, and the hot water for hot water is heated. In the first water heat exchanger 50, as indicated by the one-dot chain line arrow in FIG. 2, the refrigerant in the refrigerant circuit 10 flows into the first inner pipes 51 through the first end header 55, After flowing through each first inner pipe 51, it flows into each second inner pipe 52 via the first intermediate header 57, and after flowing through each second inner pipe 52, the other first end It flows out to the outside through the section header 55. 2, the hot water for the hot water supply circuit 20 flows into the second outer pipe 54 via the second end header 56, and the second outer pipe 54 and each After flowing between the two inner pipes 52, it flows into the first outer pipe 53 via the second intermediate header 58, and passes between the first outer pipe 53 and each first inner pipe 51. After distribution, the liquid flows out through the other second end header 56. That is, in the first water heat exchanger 50, the refrigerant and hot water supply water flow in opposite directions. At that time, since the number of the first inner pipes 51 on the downstream side of the hot water supply water is smaller than that of the second inner pipes 52 on the upstream side of the hot water supply water, the first outer pipes 53 and the first inner pipes A larger flow cross-sectional area than between the second outer pipe 54 and each second inner pipe 52 is ensured between the pipe 51 and the hot water supply water even if the scale accumulates on the downstream side of the hot water supply water. Distribution is not hindered. Further, since the number of second inner pipes 52 on the upstream side of the hot water supply water is larger than that of the first inner pipes 51 on the downstream side, the hot water supply water is sufficiently heated by each second inner pipe 52.

  As described above, according to the present embodiment, the number of the first inner pipes 51 on the downstream side of the hot water supply water is made smaller than the number of the second inner pipes 52 on the upstream side, so that Since a larger cross-sectional area can be secured between the pipe 53 and each first inner pipe 51 than between the second outer pipe 54 and each second inner pipe 52, the outer pipe 53, Even if the entire 54 or only the outer pipe 53 on the downstream side is not formed by a pipe having a large diameter, it is possible to effectively prevent the flow inhibition in the downstream outer pipe 53 due to the accumulation of scale. Therefore, productivity can be improved without increasing the types and costs of the tubes used as the materials of the outer tubes 53 and 54. In this case, since the number of the second inner pipes 52 on the upstream side of the hot water supply water is larger than that of the first inner pipes 51 on the downstream side, each of the second inner pipes 52 can sufficiently heat the hot water supply water. There is an advantage that the overall heat exchange efficiency is not lowered.

  Further, the first inner pipe 51 and the first outer pipe 53, the second inner pipe 52 and the second outer pipe 54 are connected from the same direction between the upstream side and the downstream side of the hot water supply water. Since the first and second intermediate headers 57 and 58 are provided and the pipe lines are folded back at the intermediate headers 57 and 58, the inner pipes 51 and 52 and the outer pipes 53 and 54 do not become long. The entire first water heat exchanger 50 can be downsized.

  Further, the inner pipes 51 and 52 and the outer pipes 53 and 54 are wound in a spiral shape, and a winding portion A1 is wound from the outside to the inside, and the winding is wound from the inside to the outside. Since the parts A2 are arranged in the vertical direction, and the pipes of the winding parts A1, A2 are formed continuously by shifting the pipes in the vertical direction inside the adjacent winding parts A1, A2. The inner pipes 51 and 52 and the outer pipes 53 and 54 having a large length can be wound efficiently, which is extremely advantageous for downsizing.

  In the above embodiment, the pipes are shifted inside the adjacent winding parts A1 and A2. However, the pipes may be shifted outside the winding parts A1 and A2.

  Moreover, in the said embodiment, what used the heat exchanger of this invention as the 1st water heat exchanger 50 of a heat pump type hot-water supply apparatus was shown, but this invention is the 1st heat medium and the 2nd heat medium. Can be applied to heat exchangers for other purposes.

  6 to 8 show another embodiment of the present invention. FIG. 6 is a plan view of the first water heat exchanger, FIG. 7 is a side view thereof, and FIG. 8 is a YY arrow in FIG. FIG. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.

  In this embodiment, of the four upper and lower winding parts A1, A2, the winding parts A1, A2 from the bottom to the second stage are on one side of the other winding parts A1, A2 (each winding part A1). , A2 in a direction orthogonal to the arrangement direction of A2), and the extending portion 54a is disposed below the evaporator 13 in the heating unit 70. Thereby, when the extension part 54a is not provided, the extension part 54a can be arranged in the space below the evaporator 13 which becomes a dead space, so the second outer tube 54 is provided by the amount having the extension part 54a. The capacity can be increased by increasing the length, and the capacity of the first water heat exchanger 50 can be improved.

  In addition, in the said embodiment, although what extended the 54a of the 1st water heat exchanger 50 was arrange | positioned under the evaporator 13, the extended part 54a below other apparatuses other than the evaporator 13 was shown. May be arranged.

The schematic block diagram of the heat pump type hot-water supply apparatus which shows one Embodiment of this invention Schematic side view of the first water heat exchanger Top view of the first water heat exchanger Side view of the first water heat exchanger XX sectional view taken along line XX in FIG. The top view of the 1st water heat exchanger showing other embodiments of the present invention Side view of the first water heat exchanger YY arrow direction sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 50 ... 1st water heat exchanger, 51 ... 1st inner pipe, 52 ... 2nd inner pipe, 5 3 ... 1st outer pipe, 54 ... 2nd outer pipe, 54a ... Extension part, 57 ... 1st intermediate header, 58 ... 2nd intermediate header, A1, A2 ... winding part.

Claims (5)

By providing a heat-conductive inner tube that circulates the first heat medium, and an outer tube having the inner tube disposed therein, the second heat medium is circulated between the inner tube and the outer tube. In the heat exchanger configured to exchange heat between the first heat medium and the second heat medium via a pipe,
The diameter of the outer pipe on the upstream side of the second heat medium is configured to be equal to the diameter of the outer pipe on the downstream side of the second heat medium,
A heat exchanger characterized in that the number of inner pipes on the downstream side of the second heat medium is smaller than the number of inner pipes on the upstream side of the second heat medium. A first intermediate header that is provided between the upstream inner pipe and the downstream inner pipe of the second heat medium, and the upstream inner pipe and the downstream inner pipe are connected in the same direction; ,
A second intermediate header provided between the upstream outer pipe and the downstream outer pipe of the second heat medium, and connecting the upstream outer pipe and the downstream outer pipe from the same direction. The heat exchanger according to claim 1, wherein the heat exchanger is provided. The inner tube and the outer tube are wound in a spiral shape, and winding portions wound from the outside to the inside and winding portions wound from the inside to the outside are alternately arranged and adjacent to each other. The heat exchange according to claim 1 or 2, wherein the pipes are formed so as to be continuous between the respective winding parts by shifting the pipe lines in the arrangement direction of the winding parts inside or outside the winding parts. vessel. 4. The heat exchange according to claim 3, wherein a part of each of the winding parts is formed to extend in a direction perpendicular to the arrangement direction of each winding part from the other winding parts. vessel. A heat exchanger according to claim 1, 2, 3 or 4,
A hot water supply apparatus characterized in that hot water supply water as a second heat medium is circulated in an outer pipe of the heat exchanger, and a first heat medium for heating the hot water supply is circulated in each inner pipe of the heat exchanger.

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