JP2012255595A - Hot-water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water storage type water heater having high usability which can prevent freeze by driving a circulation pump only when needed, independent of the length of pipes.SOLUTION: The hot-water storage type water heater includes: an additional heating heat exchanger 11 for heating hot water in a bath; bath circulation pipes (4-1, 5-1) in which the hot water in the bath circulates via the additional heating heat exchanger 11; a circulation pump 10 for circulating hot water in the bath circulation pipes (4-1, 5-1); a body 1 in which the additional heating heat exchanger 11 and the circulation pump 10 are installed; a supply-side end connection 4 and a return-side end connection 5 for connecting the bath circulation pipes (4-1, 5-1) with the body 1; and a water temperature detection means 15 located in the vicinity of the return-side end connection 5. When a cross section of a passage of the return-side end connection 5 is larger than that of the supply-side end connection 4 and a detection value of the water temperature detection means 15 is equal to or lower than a predetermined value, the water heater drives the circulation pump 10.

Description

  The present invention relates to a hot water storage type water heater that prevents freezing in a bath circulation channel.

  A conventional hot water storage type water heater of this type is shown in FIG. 2, and has a means 32 for detecting temperature in the space in the water heater case 31, and when the temperature drops to near 0 ° C., Freezing is prevented by operating the circulation pump 33 at a constant output and circulating and flowing water (see, for example, Patent Document 1).

  Modern houses have a dedicated space to install this type of hot water storage hot water heater, and use hot water circulation piping close to the bathroom to provide high-efficiency hot water with reduced heat dissipation from the bath and bath water. Realized.

  On the other hand, hot water storage water heaters and bathrooms are often installed in remote places due to restrictions on installation locations in narrow urban areas, and because they are easy to dissipate heat, they can easily freeze at low temperatures in winter. However, measures to prevent freezing of pipes in hot water storage water heaters corresponding to diversified installation conditions have become necessary.

JP 7-43015 A

  When the temperature is low in winter, the bath water may freeze in the bath circulation piping and the piping may be clogged, making it impossible to retreat the bath. However, in the above-mentioned conventional invention, the circulation pump is started at the low temperature in winter. In addition, the water in the piping is made to flow and the amount of heat in the hot water heater is supplied to prevent freezing. There was a problem that the same noise as when chasing was frequently generated during non-scheduled times. Heat loss was also generated due to unnecessary operation.

  An object of the present invention is to solve the above problems, and to provide a hot water storage type hot water heater that can prevent freezing regardless of the pipe length by driving a circulation pump only when necessary. And

  In order to achieve the above object, a hot water storage type water heater of the present invention comprises a reheating heat exchanger for heating hot water in the bath, and a bath circulation pipe for circulating the hot water in the bath through the reheating heat exchanger. A circulation pump for circulating hot water in the bath circulation pipe, the reheating heat exchanger, a main body provided with the circulation pump, a forward connection port for connecting the bath circulation pipe to the main body, a return side A connection port, a water temperature detecting means disposed in the vicinity of the return side connection port, and a control unit, wherein a cross-sectional area of the passage of the return side connection port is larger than that of the forward connection port, and the water temperature The circulating pump is driven when the detection value of the detection means is not more than a predetermined value.

According to the above invention, the circulation pump is driven only when necessary by detecting the water temperature of the return side connection port passage portion that is most likely to freeze at low temperatures that may cause freezing inside the pipe and performing the freeze prevention operation. It is possible to provide a hot water storage type hot water heater that can be used.

  In addition, by making the return side connection port passage portion larger than the outgoing side connection port and increasing the water capacity, it is possible to directly detect the temperature of the freezing point by eliminating the temperature effect inside the water heater.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage type hot water heater with high usability which can prevent freezing regardless of piping length can be provided by driving a circulation pump only when necessary.

Sectional drawing of the hot water storage type water heater in Embodiment 1 of this invention Cross section of a conventional water heater

  The first invention is a reheating heat exchanger for heating hot water in a bath, a bath circulation pipe for circulating hot water in the bath through the reheating heat exchanger, and hot water in the bath circulation pipe. A circulation pump to circulate, the reheating heat exchanger, a main body provided with the circulation pump, a forward side connection port for connecting the bath circulation pipe to the main body, a return side connection port, and a return side connection port. A water temperature detecting means disposed in the vicinity; and a control means, wherein the cross-sectional area of the passage of the return side connection port is larger than that of the forward side connection port, and the detection value of the water temperature detection means is a predetermined value or less. The hot water storage type hot water heater is characterized in that the circulating pump is driven.

  According to this, the circulating pump is driven only when necessary by detecting the water temperature of the return-side connection port passage portion that is most likely to be frozen at a low temperature where there is a risk of freezing inside the pipe and performing the freeze prevention operation. It is possible to provide a hot water storage type water heater that is highly usable.

  In addition, by making the return side connection port passage portion larger than the outgoing side connection port and increasing the water capacity, it is possible to directly detect the temperature of the freezing point by eliminating the temperature effect inside the water heater.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a hot water storage type water heater in Embodiment 1 of the present invention.

  In FIG. 1, 1 is a product body of a heat pump water heater, and a pipe connection plate 3 that is one step higher than the bottom plate 2 includes a water supply port 3-1, a hot water supply port 3-2, a forward connection port 4, and a return connection. The port 5 is fixed so that a water supply pipe 3-3, a hot water supply pipe 3-4, a bath outlet pipe 4-1, a bathtub 4-2, and a bath return side pipe 5-1 can be provided.

  6 is a tank and 7 is a boiling means. The water supply port 3-1 and the lower part of the tank 6 are connected to each other by a water supply pipe 6-1 so that water can be supplied. The required amount of hot water can be stored.

  8 is a hot water supply temperature adjusting means, and 9 is a bath temperature adjusting means, which are connected to the upper part of the tank 6, respectively, so that hot water and bath water can be heated at an appropriate temperature. 10 is a circulation pump, 11 is a reheating heat exchanger, which is connected to the forward connection port 4 and the return connection port 5 by an internal pipe 12, and 12 is a heat exchanger heating means connected at the upper part of the tank 6. .

  The heat exchanger heating means 12 supplies the amount of heat stored by circulating hot water stored between the upper portion of the tank 6 and the reheating heat exchanger 11 to the reheating heat exchanger 11, and the bathtub It can be reheated by heating the water.

  Hot water heated by the reheating heat exchanger 11 passes through the forward connection port 4 by the circulation pump 10 and is sent from the external piping to the bathtub to be retreated, and the returned water is returned from the return connection port 5 to the inside. It is made to circulate by the path | route to the heat exchanger 11 which reheated by the piping 12 again.

  A pump control means 13 can drive the circulation pump at multi-stage output levels. Reference numeral 14 denotes a circulation detection means, which has a flow switch 14-1 in a state where it hangs down in the water, and is normally in an OFF state.

  A passage in the vicinity of the return side connection port 5 has a water temperature detection means 15, and is wired in the hot water storage type water heater so as to operate in conjunction with the pump control means 13 and the circulation detection means 14.

  If there is a possibility that the inside of the pipe may freeze at low temperatures in winter, the conventional technology provides a sensor for detecting the outside air temperature on the surface of the pipe connection plate 3 to detect that the temperature is low in winter and drives the circulation pump. Although the water inside the pipes was allowed to flow to prevent freezing, even when the inside of the pipes, such as highly heat-retaining pipes, was not at a low temperature, the circulation pump was driven frequently, so it was large at unexpected times. It was not easy to use because of the noise, and the circulation pump was driven at a constant speed, so it always operated at the same speed as the reheating of the bathtub.

  Conversely, there are cases where the heat insulation of the piping is poor, that is, when there are restrictions on the installation space of the water heater such as a house in a narrow area, use a resin hose that is long and easy to construct, and that has a narrow passage diameter It often freezes at low temperatures, and if the inside of the piping is clogged with freezing, it will not be possible to reheat the bathtub or hot water.

  The circulating water is cooled by a bathtub or a low outside air temperature, becomes low in temperature, remains in the passage of the return side connection port 5, and if the path is long even when the circulation pump 10 is driven, the return side connection port 5 It takes a certain amount of time for the water in this passage to flow, and in places where it is exposed to strong winds below freezing, it freezes due to the high freezing speed.

  It has been known that many of the problems occur from the return side connection port 5. In the present invention, a means for detecting the water temperature is provided in the passage portion of the return side connection port 5 which is most likely to freeze at low temperatures, and the circulation pump 10 is driven only when necessary to reduce heat loss and operation noise. Minimized.

  Conventionally, the temperature detecting means has been wired inside the hot water heater having a higher temperature than the outside air and tends to detect the temperature higher than the passage where freezing occurs. It was necessary to set the temperature higher by 3 ° C. However, by increasing the area of the return-side connection port 5 and increasing the internal water capacity, other temperature effects can be eliminated and the required temperature can be detected accurately. ing.

  As a result, the starting temperature of the circulation pump 10 can be lowered to the freezing point, and the loss of heat and the waste of operation noise due to the driving of the circulation pump 10 can be further suppressed.

  On the other hand, the hot water heated by the reheating heat exchanger 11 remains in the passage of the outgoing connection port 4, and the water temperature at the time of the circulation stop is higher than that of the return connection port 5, and there is no fear of freezing. However, if the bathtub is rerun after the temperature has gradually decreased, low-temperature hot water is supplied to the bathtub, so the passage of the forward connection port 4 must be made as small as possible. The passage of the mouth 5 is made larger than the passage of the outgoing connection port 4.

When the circulation detection unit 14 determines that the water temperature has fallen below the freezing point by the water temperature detection unit 15, the circulation detection unit 14 drives the circulation pump 10 for a certain period of time and detects that the flow switch 14-1 is ON, and then the circulation pump 10 When the output is lowered and the flow switch 14-1 is turned OFF, the level is then gradually increased, and the circulating pump is driven so as to maintain the output level when turning from OFF to ON.

  As a result, water is filled in the bathtub and the piping, and the water flows immediately before it freezes, and the operation is continued while controlling so that the flow rate is not higher than necessary, thereby preventing the trouble of the piping clogging due to freezing.

  By providing an upper limit flow switch that is turned on at a flow rate one step higher than the flow rate at which the flow switch 14-1 is turned on, the output of the circulation pump 10 may be constantly controlled so that the upper limit flow switch is not turned on. .

  As described above, the hot water storage type hot water heater of the present invention can be applied not only for home use but also for business use because it can prevent freezing failure and improve usability.

DESCRIPTION OF SYMBOLS 1 Main body 4 Outward side connection port 4-1 Bath outgoing piping 5 Return side connection port 5-1 Bath return piping 10 Circulation pump 11 Reheating heat exchanger 13 Pump control means 14 Circulation detection means 14-1 Flow switch 15 Water temperature detection means

Claims (1)

A reheating heat exchanger for heating hot water in the bath, a bath circulation pipe for circulating hot water in the bath through the reheating heat exchanger, a circulation pump for circulating hot water in the bath circulation pipe, The reheating heat exchanger, the main body provided with the circulation pump, the forward connection port for connecting the bath circulation pipe to the main body, the return connection port, and the return connection port are disposed in the vicinity. A water temperature detecting means and a control means, wherein a cross-sectional area of the return-side connection port is larger than that of the forward-side connection port, and the circulating pump is operated when the detected value of the water temperature detection means is a predetermined value or less. A hot water storage type water heater characterized by being driven.

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