JP2013011387A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger in which inspection man-hours of a heat pump water heater are reduced and maintenance and service properties are improved.SOLUTION: A tube type heat exchanger 1 includes: a water channel 104 in which water flows; and a refrigerant channel 102 which is located in the water channel 104 and in which a refrigerant flows. The heat exchanger exchanges heat between the water and the refrigerant. A resin material having transparency is used to part of a water tube 5 serving as a wall surface of the water channel 104, and from the standpoint of the appearance of the heat exchanger 1, the wall surface of the water tube 5 is transparent and a refrigerant tube 103 constituting the refrigerant channel 102 can be seen. Accordingly, a state in the water channel 104 can be confirmed from the outside of the heat exchanger 1 in a non-destructive manner without cutting and dismantling the heat exchanger 1 in a conventional manner. As a result, the inspection man-hours of the heat pump water heater are reduced, and the heat exchanger contributes to improve the maintenance and service properties.

Description

  The present invention relates to a heat exchanger for exchanging heat between a fluid such as water and two kinds of fluids such as a refrigerant, such as a heat pump type hot water heater, etc., used in equipment such as an air conditioner and a hot water heater. It is.

  Conventionally, this type of heat exchanger is composed of a water pipe that constitutes a water flow path and a refrigerant pipe that constitutes a refrigerant flow path, and is a dual type that exchanges heat between water flowing through the water flow path and refrigerant flowing through the refrigerant flow path. A pipe-type heat exchanger has been devised (see, for example, Patent Document 1).

4 and 5 show a conventional heat exchanger described in Patent Document 1. FIG.
As shown in FIGS. 4 and 5, the heat exchanger 101 is a double-pipe heat exchanger, and is provided outside the refrigerant pipe 103, a refrigerant pipe 103 in which a refrigerant flow path 102 is formed, A copper water pipe 105 having a water flow path 104 formed between the refrigerant pipe 103 and two refrigerant pipes 103 are provided in the present embodiment.

  The operation of the heat exchanger configured as described above will be described below.

  The heat exchanger 101 is formed by a double pipe including a refrigerant pipe 103 and a water pipe 105, and exchanges heat between water and the refrigerant.

  The water flowing through the water channel 104 contains scale components such as calcium, and the amount of scale deposition in the water channel 104 tends to increase as the temperature of the water rises.

  In particular, when the water temperature exceeds 60 ° C., the amount of scale deposition starts to increase abruptly, and depending on the water quality, the scale component may accumulate in the high-temperature section tube of the heat exchanger 101, leading to clogging.

  In addition, when the water quality of the heat exchanger 101 is not good (for example, water containing red rust), the outer surface of the refrigerant pipe 103 may become dirty and inhibit heat transfer.

  When the heat exchanger 101 is clogged in the high-temperature section pipe or the outer surface of the refrigerant pipe 103 is extremely dirty, the refrigerant pressure of the heat pump water heater is excessively increased, and the operation is performed by a control operation that protects the heat pump water heater. The problem is that the system stops and cannot operate normally.

JP 2005-69620 A

  However, in the conventional heat exchanger, when the abnormally stopped heat pump water heater is inspected, the water pipe 105 is used when the water flow path 104 of the heat exchanger 101 is clogged or the outer surface of the refrigerant pipe 103 is visually observed. Because it is made of copper, it cannot be seen from the appearance, and unless the heat exchanger 101 is taken out of the heat pump water heater and the double pipe is cut, the internal normal state of the water channel 104 cannot be confirmed, which is very laborious. It had the problem that.

This invention solves the said conventional subject, and it aims at providing the heat exchanger excellent in service property which can confirm the state inside a water flow path easily, without cut | disconnecting a heat exchanger. .

  In order to solve the above-described conventional problems, the heat exchanger of the present invention includes a water flow channel through which water flows and a refrigerant flow channel that is disposed in the water flow channel and into which refrigerant flows, and the water and the water In the heat exchanger for exchanging heat with the refrigerant, by using a resin material having transparency on the wall surface of the water flow path, the refrigerant that forms the refrigerant flow path through the wall surface of the water flow path on the appearance of the heat exchanger It is configured to see the tube.

  With this configuration, the heat pump type can be confirmed from the appearance of the heat exchanger in a non-destructive manner without cutting and disassembling a conventional heat exchanger. In the event of a water heater malfunction, not only will the number of inspection steps for blockage of the water flow path of the heat exchanger be reduced and serviceability will be improved, but it will also be possible to easily monitor whether the refrigerant pipe surface is corroded and discolored, so heat pump hot water The quality of the machine can be kept simple.

  The heat exchanger of the present invention uses a resin material having transparency on the wall surface of the water channel in the heat exchanger for exchanging heat between water and the refrigerant. The refrigerant pipes that make up the refrigerant flow path can be seen through, and the state inside the water flow path can be confirmed from the appearance of the heat exchanger in a non-destructive manner. The number of man-hours required to check the equipment can be reduced, and a heat exchanger with excellent serviceability can be provided.

External view of the heat exchanger in Embodiment 1 of this invention Cross-sectional view in the axial direction of the double pipe of the heat exchanger in the first embodiment External view of double pipe of heat exchanger in Embodiment 1 Schematic diagram of conventional heat exchanger Axial sectional view of a double pipe of a heat exchanger showing a conventional example

  1st invention consists of the water flow path through which water flows inside, and the refrigerant flow path which is arrange | positioned in the said water flow path and a refrigerant | coolant flows inside, The said refrigerant flow path consists of a refrigerant | coolant pipe | tube, The said water, the said refrigerant | coolant, In the heat exchanger for exchanging heat, by using a resin material having transparency on the wall surface of the water flow path, a refrigerant pipe that forms the refrigerant flow path through the wall surface of the water flow path is formed on the appearance of the heat exchanger. It is configured to be visible.

  With this configuration, the state inside the water channel can be confirmed from the appearance of the heat exchanger in a non-destructive manner without cutting and dismantling the conventional heat exchanger. The number of man-hours to check the hot water heater is reduced and serviceability is improved.

  According to a second invention, in the first invention, a transparent resin material is used on the outlet side of the water channel.

  By adopting such a configuration, it becomes possible to always monitor the state inside the water channel on the high temperature side where the scale component is likely to be deposited without destruction, and the problem of blockage due to the scale component can be prevented beforehand.

  According to a third invention, in any one of the first to second inventions, the refrigerant is carbon dioxide.

  By setting it as this structure, it can be efficiently used for the heat pump type water heater which produces | generates 90 degreeC-95 degreeC high temperature water. And, even for the problem of increasing the risk of blockage of the water flow path due to the scale component, it is possible to more effectively monitor the deposition state of the scale component non-destructively by using a transparent resin material for the water flow path. Can do.

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

(Embodiment 1)
FIG. 1 is an external view of a heat exchanger according to Embodiment 1 of the present invention. FIG. 2 is an axial cross-sectional view of the double pipe in the first embodiment. FIG. 3 is an external view of a double pipe showing the main part of the heat exchanger in the first embodiment.

  In addition, about the same structure as the conventional heat exchanger 101, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIGS. 1 to 3, the heat exchanger 1 is a double-pipe heat exchanger, and is provided outside the refrigerant pipe 103 and a refrigerant pipe 103 in which a refrigerant flow path 102 is formed. The water pipe 5 is formed with a water channel 104 between the refrigerant pipe 103 and the refrigerant pipe 103.

  In the first embodiment of the present invention, the refrigerant tubes 103 are spirally twisted together as shown in FIG. 3 and are contained in the water tube 5 so that the center of the spiral is substantially coaxial with the axis of the water tube 5. Yes. For this reason, water flows between the water pipe 5 and the refrigerant pipe 103, and the flow becomes a swirl flow along the spiral of the refrigerant pipe 103.

  Further, the water pipe 5 is made of a resin material having transparency or translucency (for example, cross-linked polyethylene), and is configured such that the refrigerant pipe 103 can be seen through the water pipe 5 on the appearance of the heat exchanger 1. The water tube 5 is preferably made of a resin material having a visible light transmittance of 20% or more.

  The operation of the heat exchanger configured as described above will be described below.

  The heat exchanger 1 is formed by a double pipe of the refrigerant pipe 103 and the water pipe 5, and exchanges heat between water and the refrigerant.

  As described in the conventional example, the water in the water flow path 104 contains scale components, and when the water temperature becomes high, the amount of scale deposition starts to increase rapidly. In some cases, the inside of the high-temperature section of the heat exchanger 1 is blocked. As a result, the refrigerant pressure of the heat pump type hot water heater is excessively increased and the heat pump type hot water heater is abnormally stopped. Even when the water quality is not good, the outer surface of the refrigerant pipe 103 may become dirty, and the heat pump type hot water heater may be abnormally stopped.

  When checking the abnormally stopped heat pump type hot water heater, in order to confirm the clogged state of the water flow path 104 and the dirt on the outer surface of the refrigerant pipe 103, a conventional water pipe 105 made of a metal non-transparent material is used. Then, the inside of the water flow path 104 cannot be seen from the appearance of the heat exchanger 101, and the internal normal state of the water flow path 104 may be confirmed unless the heat exchanger 101 is removed from the heat pump water heater and the double pipe is cut. could not.

  Therefore, by using a part of the resin material having transparency for the water pipe 5 which is the wall surface of the water flow path 104, the wall surface of the water flow path 104 is seen through the heat exchanger 1 and the refrigerant pipe 103 can be seen. As a result, the state inside the water flow path 104 can be confirmed from the appearance of the heat exchanger 1 without breaking, without cutting and dismantling the heat exchanger 1.

  Accordingly, there is an effect that the man-hour for checking the heat pump type hot water heater at the time of an abnormality such as the blockage of the water flow path 104 of the heat exchanger 1 is reduced and the serviceability is improved.

  The state in which the wall surface of the water channel 104 can be seen through and the refrigerant pipe 103 can be seen as shown in FIG. 3 shows the outline of the refrigerant pipe 103 through the water pipe 5 so that the refrigerant pipe 103 and the water channel 104 can be distinguished from each other. State.

  Preferably, if the water tube 5 is made of a resin material having a visible light transmittance of 20% or more, the state inside the water channel 104 can be clearly seen. In addition to grasping, it is possible to monitor whether or not the surface of the refrigerant pipe 103 is corroded and discolored, so that the quality of the heat pump type hot water heater can be simply maintained.

  In addition, by using a transparent resin material on the outlet side of the water channel 104, it is possible to always monitor the state inside the water channel on the high temperature side where the scale component is likely to be deposited, without being destructed. It can be prevented beforehand.

  Moreover, by using carbon dioxide as the refrigerant, it can be efficiently used for a heat pump type hot water heater that generates high-temperature water at 90 ° C. to 95 ° C. And, even for the problem of increasing the risk of blockage of the water flow path due to the scale component, it is possible to more effectively monitor the deposition state of the scale component non-destructively by using a transparent resin material for the water flow path. Can do.

  As described above, the heat exchanger 1 according to the first embodiment includes the water channel 104 through which water flows and the coolant channel 102 that is disposed in the water channel 104 and through which refrigerant flows. In the heat exchanger 1 for exchanging heat, by using a part of the resin material having transparency on the wall surface of the water pipe 5 that constitutes the water channel 104, the wall surface of the water channel 104 is transparent on the appearance of the heat exchanger 1. The refrigerant pipe 103 constituting the refrigerant flow path 102 is provided so as to be seen.

  Therefore, since the state inside the water channel 104 can be confirmed from the appearance of the heat exchanger 1 without breaking without disassembling the heat exchanger 1 as in the prior art, the heat pump type can be used when the water channel 104 is in an abnormal state. Maintenance workability can be improved by reducing the number of man-hours for checking the water heater.

  In the first embodiment of the present invention, the number of refrigerant pipes 103 arranged in the water pipe 5 is two, but the same effect can be expected even when the number of the refrigerant pipes is one or more.

  In Embodiment 1 of the present invention, the water tube 5 is made of crosslinked polyethylene. For example, polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, modified polyphenylene ether, ABS, methacryl, polyvinyl chloride, polystyrene, acrylic Resin materials and glass materials such as polyamide, polycaponade, tetrafluoroethylene, ethylene acid bicopolymer, finol, melamine, unsaturated polyester, epoxy, polyphenylene sulfide, etc., are the same as long as they are transparent or translucent materials Can be expected.

  In Embodiment 1 of the present invention, the water flow path 104 is formed by the tubular water pipe 5, but if the material constituting the water flow path 104 is transparent or translucent, Similar effects can be expected with other channel shapes (for example, rectangular channels).

  Further, in Embodiment 1 of the present invention, the refrigerant circulating in the refrigerant pipe 103 is carbon dioxide. However, the same effect can be obtained by using a hydrocarbon or HFC (such as R410A) refrigerant or an alternative refrigerant thereof. The effect can be expected.

  As described above, the heat exchanger according to the present invention is composed of a water flow channel made of a resin material having transparency, and the heat exchanger has an external appearance and the refrigerant pipe in the water flow channel is seen through. The maintenance serviceability can be improved by reducing the inspection time of the machine, supercritical heat pump type water heater using carbon dioxide, supercritical heat pump device for heating the heating brine, and air conditioning for home use and business use In addition to heat pump equipment such as a washing machine / dryer equipped with a drying function by a heat pump or a heat pump and a grain storage warehouse, the present invention can also be applied to heat exchange applications such as a fuel cell.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 5 Water pipe 102 Refrigerant flow path 103 Refrigerant pipe 104 Water flow path

Claims (3)

In a heat exchanger that comprises a water flow path through which water flows and a refrigerant flow path that is disposed in the water flow path and through which refrigerant flows, and is transparent to the wall surface of the water flow path in the heat exchanger that exchanges heat between the water and the refrigerant. A heat exchanger characterized in that, by using a resin material having a property, on the appearance of the heat exchanger, the wall surface of the water flow channel can be seen through and the refrigerant pipe constituting the refrigerant flow channel can be seen. The heat exchanger according to claim 1, wherein a resin material having transparency is used on the outlet side of the water flow path. The heat exchanger according to any one of claims 1 to 2, wherein the refrigerant is applied to a heat pump type water heater as carbon dioxide.