JPH10267415A - Fluid heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable reducing of heat dissipation loss and heating of a large flow rate of fluid at low cost with small heat energy, high heat exchange efficiency, and quick temperature rise in a liquid heating apparatus, and to miniaturize the same. SOLUTION: In a heat exchanging part 20 of a heating bactericidal tank 16, an inlet pass 21 through which fluid is fed and an outlet pass 22 through which the heat-treated fluid is discharged form an opposed flow each other to be spirally wound in the state wherein they alternately contact with each other, and a heater 18 is provided at its center. Heat exchange is provided between the fluid passing through the inlet pass 21 and the fluid passing through the outlet pass 22 after the heat treatment, thus enabling heating up to high temperature in a short time with a small capacity of heating source and good heat recovery efficiency, and also minimizing the defference between the inlet temperature and the outlet temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid heating device configured to exchange heat between a fluid passing through an inflow passage and a fluid passing through an outflow passage, and for example, a circulating warm bath machine for circulating hot water in a bathtub. The present invention relates to a heating device applied to the apparatus.

[0002]

2. Description of the Related Art Conventionally, this type of fluid heating apparatus has various uses. For example, in the case of heating hot water to be circulated in a circulating hot water bath, while circulating bath water stored in a bathtub using a circulation pump. It is known that the temperature of the bath is raised or kept warm, and at the same time, the bath water is filtered and cleaned, and furthermore, it is sterilized to prevent bacteria from growing. To obtain this disinfecting action, it is necessary to heat the bath water to a high temperature of, for example, 70 ° C. As a liquid heating device exhibiting such a heat sterilization function, in order to recover the heat of the heated liquid, heat is exchanged between the liquid flowing into the heating source and the liquid flowing out of the heating source. A device provided with an exchanger has been proposed (for example, see Japanese Patent Application Laid-Open No. 5-305124).

[0003]

However, in the above-described heat exchanger in the conventional liquid heating apparatus, it is difficult to greatly increase the heat recovery efficiency without increasing the overall shape. Attempting to heat the liquid to a high temperature in a short time at the heating source by using a relatively large flow rate requires a large heat energy, that is, a large-capacity heating source, and increases running costs. Also, if the flow path resistance in the heat exchanger is large, the flow velocity cannot be increased, so that it is difficult to increase the flow rate. Further, it has been desired to further reduce the heat radiation loss in the liquid heating device. In addition, when applied to a circulating hot water bath and heat sterilization by liquid heating, the difference between the inflow temperature and the outflow temperature is small in order to prevent the temperature of bath water from rising above a predetermined value in summer etc. Is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to greatly reduce a heat radiation loss, have a high heat exchange efficiency, a high temperature rise, and a low heat energy. It is an object of the present invention to provide a liquid heating device capable of heating a large amount of fluid at a low cost and achieving downsizing. In addition, the difference between the inflow temperature and the outflow temperature is reduced, and it is possible to have the function of heat sterilization,
An object of the present invention is to provide a liquid heating device suitable for a circulating hot water bath.

[0005]

In order to achieve the above object, the invention according to claim 1 is directed to an inflow passage into which a fluid flows, an outflow passage through which a fluid after heat treatment flows out, and an inflow passage through the inflow passage. A heating source for heating the fluid, the fluid flowing through the inflow channel and the heated fluid flowing through the outflow channel are configured to exchange heat with each other. It becomes a counter flow, and is spirally wound in a state of being in contact with each other alternately to form a heat exchange part, and the end part of the inflow path and the start end of the outflow path are opened to the center part of the spiral heat exchange part, A heating source is arranged in this portion.

In the above configuration, the fluid flowing in from the inflow path and the fluid flowing out of the outflow path after being heated by the heating source are opposed to each other and exchange heat. The inflow path and the outflow path are in contact with each other to form a spiral heat exchange section, and the inflowing fluid is heated by a heating source at a central portion of the heat exchange section. For this reason, heat loss is reduced, and it is possible to heat to a high temperature in a short time with a small-capacity heating source. Further, since the passage of the heat exchange section is spiral, the amount of heat recovery can be increased without increasing the shape of the heat exchange section, and the difference between the inflow temperature and the outflow temperature can be reduced. In addition, since the flow path resistance is small, it is easy to increase the flow velocity to the turbulent flow region, and it is possible to dramatically increase the amount of exchanged heat with a high heat transfer rate due to turbulent heat transfer.

According to a second aspect of the present invention, in the configuration according to the first aspect, the inlet of the inflow passage and the outlet of the outflow passage are provided on an outer peripheral portion of the spiral heat exchange portion. Things. In this configuration, since the temperature of the outer peripheral portion is low, the amount of heat radiation is reduced, and the heat exchange efficiency is increased.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a piping configuration diagram of a circulating warm bath to which a fluid heating device according to an embodiment of the present invention is applied, and FIG. 2 is a schematic perspective view of the circulating warm bath. The circulating warm bath machine 1 is disposed close to a bathtub 11 storing bathwater 10 (hot water). The bathwater 10 in the bathtub 11 is circulated by a circulation pump 13 while the bath heater 1 is circulated by a fluid heating device 16.
This is for raising the temperature of 0, keeping the temperature and purifying. Circulating warm bath machine 1
Is a circulating pump 13 provided in a circulating flow path for circulating the bath water 10, and a purification tank 15 provided on the discharge side of the circulating pump 13 and having a filtering material for purifying the circulating bath water.
And a fluid heating device 16 provided downstream thereof. The circulation flow path includes a suction path 14a, a connection path 14b from the septic tank 15 to the fluid heating device 16, a discharge path 14c for returning bath water from the fluid heating device 16 to the bathtub 11, and the like.

FIGS. 3 and 4 are an external view and a sectional view of the fluid heating device 16, respectively. The fluid heating device 16 includes a heat exchange unit 20 for exchanging heat between the inflow side hot water and the outflow side hot water, a sterilization tank 17 for heating the inflowing hot water, and a heater 18 ( Heating source). The heat exchange section 20 includes an inflow passage 21 (indicated by a two-dot chain line) in which an inflow port 21 a is communicated with the connection passage 14 b and the discharge passage 1.
4c, an outlet 22b communicated with an outlet 22b, which are spirally wound in contact with each other and have a flattened shape, and the hot water flowing through the inlet 21 and the hot water flowing through the outlet 22 are separated from each other. The flows are opposed to each other, and heat is exchanged. The terminal end 21b of the inflow path 21 and the start end 22a of the outflow path 22 open toward a sterilization tank 17 which is a space at the center of the fluid heating device 16, and a heater 18 is disposed here. The inflow channel 21a of the inflow channel 21 and the outflow channel 22b of the outflow channel 22 are connected to the spiral heat exchange section 20.
Is provided on the outer peripheral portion of the.

The housing of the fluid heating device 16 is made of a material having a low heat conductivity, and the inflow passage 21 and the outflow passage 22 of the heat exchange section 20 are spirally partitioned side by side with a material having a high heat conductivity. It is formed by doing.

Next, the operation of the circulating warm water bath 1 according to the above embodiment will be described. The tub 11 is driven by the circulation pump 13.
Bath water 10 is circulated through a circulation channel. The heater 18 is controlled based on the hot water temperature detected by a temperature sensor (not shown) so that the temperature of the bath water 10 in the bathtub 11 is raised to a predetermined value and kept warm. The circulated bath water is filtered and purified by the purification tank 15. The purified bath water enters the fluid heating device 16 through the connection passage 14b, and is introduced into the sterilization tank 17 at the center of the fluid heating device 16 through the inflow passage 21 from the inlet 21a of the heat exchange unit 20. . The hot water introduced into the sterilization tank 17 is heated to a temperature required for sterilization by the heater 18, heat sterilized, passed through the outflow channel 22, led out of the outlet 22 b to the discharge channel 14 c, and discharged into the bathtub 11.
Is returned to. In the heat exchange section 20, the hot water passing through the inflow channel 21 and the hot water passing through the outflow channel 22 exchange heat in opposite directions, so that when entering the sterilization tank 17 through the inflow channel 21, the temperature is gradually increased. When the liquid is led out to the discharge path 14c through the outflow path 22, the temperature is lowered to an appropriate temperature that does not hinder the return to the bathtub 11.

Since the heat exchange section 20 is formed in a spiral shape, a large heat exchange area can be ensured with a small size and space saving, and the inflow side and the outflow side are opposed to each other. Since energy is effectively transmitted, the temperature required for sterilization (for example, 70
(° C) in a short time. This allows
Purification while circulating at a large flow rate of a certain level or more, heat sterilization can always be performed while keeping the hot water clean, and even though heat sterilization is used, the temperature of the bath water 10 rises even in the summer, etc. It will not be too long.
In addition, since the inflow side and the outflow side hot water exchange heat with each other in the heat exchange section 20 of the fluid heating device 16, heat sterilization can be performed at low cost with little heat energy.

Further, since the temperature of the central portion of the fluid heating device 16 is high and the temperature of the outer peripheral portion is low, heat loss is reduced.
High heat exchange efficiency. Further, since the heat exchange unit 20 has a spiral shape, the amount of heat recovery can be increased, the difference between the inflow temperature and the outflow temperature can be reduced, and the heat exchange unit 20 is suitable for a circulating warm bath.
In addition, since the flow path resistance is small, it is easy to increase the flow velocity to the turbulent flow area, and it is possible to dramatically increase the amount of exchanged heat with a high heat transfer rate due to turbulent heat transfer,
It is easy to reduce the size of the heat exchange unit 20 and increase the capacity.

The present invention is not limited to the configuration of the above embodiment, and various modifications are possible. For example, in the above description, an example in which the present invention is applied to a circulating warm water bath having a sterilizing function is shown. However, the present invention is not limited to this, and is also applicable to heating a gas (a liquid having a low boiling point becomes a gas when heated). It is possible.

[0015]

As described above, according to the first aspect of the present invention,
The inflow path and the outflow path are in contact with each other to form a spiral heat exchange section, and are heated by a heating source at the center of the heat exchange section, so there is little heat loss, short heat energy, low cost and short. It becomes possible to heat a large amount of fluid to a high temperature at a time. In addition, since the flow path resistance is small, it is easy to increase the flow velocity to the turbulent flow area, and it is possible to dramatically increase the heat exchange rate with a high heat transfer rate due to turbulent heat transfer. The size can be reduced and the capacity can be increased. In addition, since the difference between the inflow temperature and the outflow temperature can be reduced while heating to a high temperature, the device is suitable for a circulating warm bath having a heat sterilization function.

According to the second aspect of the present invention, in addition to the above effects, the inlet and the outlet are provided on the outer peripheral portion of the spiral heat exchange portion, so that the temperature of the outer peripheral portion is low, The amount of heat radiation is reduced, and the thermal efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a piping configuration diagram of a circulating warm bath to which a fluid heating device according to an embodiment of the present invention is applied.

FIG. 2 is a schematic perspective view of a circulating warm water bath according to the present embodiment.

FIG. 3 is an external view of a fluid heating device used in the present embodiment.

FIG. 4 is a sectional view of a fluid heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circulation warm bath machine 10 Bath water (liquid) 13 Circulation pump 16 Fluid heating device 17 Sterilization tank 18 Heater (Heating source) 20 Heat exchange part 21 Inflow path 21b End part 22 Outflow path 22a Start end

Claims (2)

[Claims] 1. An inflow path into which a fluid flows, an outflow path through which a heat-treated fluid flows out, and a heating source heating a fluid flowing through the inflow path, wherein the fluid passing through the inflow path In the fluid heating device, the heated fluid passing through the outflow passage is configured to exchange heat with each other.The inflow passage and the outflow passage are opposed to each other, and are spirally wound in a state of being alternately in contact with each other. It is turned around to form a heat exchange part, and the end part of the inflow path and the start end of the outflow path are opened to the center of the spiral heat exchange part, and the heating source is arranged in this part. Fluid heating device. 2. The fluid heating device according to claim 1, wherein an inflow port of the inflow path and an outflow port of the outflow path are provided on an outer peripheral portion of the spiral heat exchange unit.