JP7272826B2 - water heater - Google Patents

Description

The present invention relates to a piping layout for preventing freezing within instruments.

Conventionally, this type of hot water storage type water heater includes a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the lower part of the hot water storage tank, and a hot water supply for discharging hot water from the upper part of the hot water storage tank. a pipe, a water supply bypass pipe branched from the water supply pipe, and a hot water supply mixing valve for mixing high-temperature hot water flowing through the hot water supply pipe with water flowing through the water supply pipe, and is required if a user requests hot water supply. Hot water was discharged from the top of the hot water storage tank and mixed with cold water to supply hot water.

In addition, conventionally, electric heaters are installed in places where there is a risk of freezing, and when the temperature drops, the electric heaters are turned on to prevent freezing, and moldings that cover hot water storage tanks located in places where freezing is likely It is known to prevent freezing by making a part of the heat insulating material thinner and utilizing the heat radiation of the hot water storage tank (Patent Document 1).

Japanese Patent Application Laid-Open No. 2004-271102

However, if an electric heater is installed in a place where there is a risk of freezing, and the electric heater is turned on when the temperature drops to prevent freezing, the electric heater must be turned on all the time in cold weather, which increases the electricity cost. In addition, if a part of the molded heat insulating material covering the hot water storage tank is made thin to prevent freezing by utilizing heat radiation from the hot water storage tank, the heat is released only near the molded heat insulating material, and the heat If the thickness is too thin in order to increase the capacity, the stored hot water heat will be continuously released, and there is a risk that the hot water tank will run out of hot water during the daytime when the electricity cost is high.

In order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a molded heat insulating material covering the hot water storage tank, heating means for heating the water in the hot water storage tank, and circulation between the hot water storage tank and the heating means. A heating supply pipe and a heating return pipe that are connected so as to be possible, a water supply pipe that supplies water to the hot water storage tank, a hot water outlet pipe that supplies hot water from the upper part of the hot water storage tank, and a medium temperature water outlet at the middle part of the hot water storage tank. A medium-temperature hot water supply pipe to supply, a heating bypass pipe branched from the heating return pipe and connected to the water supply pipe, and a heating bypass valve capable of switching the flow path to the heating bypass pipe in the middle of the heating return pipe. and a control device for performing a freeze prevention operation in which hot water is circulated through the heating means, the heating return pipe, the heating bypass valve, the heating bypass pipe, the water supply pipe, the lower part of the hot water storage tank, and the heating supply pipe. In the provided water heater, the molded heat insulating material has a heat insulating material hole for connecting the medium-temperature water outlet pipe and the medium-temperature water outlet, and the medium-temperature water outlet pipe extends from the medium-temperature water outlet. It has a horizontal portion extending in a substantially horizontal direction and a vertical portion extending from the horizontal portion toward the top of the hot water storage tank. The hot water storage tank and the heating return pipe are arranged so as to pass above the vicinity of the heat insulating material hole and intersect the horizontal portion , and the connection position between the hot water storage tank and the heating return pipe is higher than the intersecting position with the horizontal portion. It is now connected to the position .

In addition, the heating return pipe is provided with a pipe heat insulating material to prevent heat dissipation of hot water passing through the pipe, and at least one of the horizontal portion and the medium temperature water outlet and the medium temperature water outlet of the heating return pipe. The pipe heat insulating material is not provided in the vicinity of the horizontal portion of the pipe and the crossing portion.

According to this invention, the water heated by the heating means in the anti-freezing operation is heated by the heating return pipe, the heating bypass valve, the heating bypass pipe, the water supply pipe, the lower part of the hot water storage tank, the heating pipe, and the By repeating circulation in the path of the heating means, freezing of this path and its surroundings can be prevented, and the vicinity of the horizontal portion of the intermediate hot water outlet pipe is placed in the heating return pipe on the downstream side of the heating bypass valve. By passing through the upper side, each time hot water is supplied to the intermediate hot water outlet pipe for use of intermediate hot water, heat is released from the intermediate hot water outlet pipe to the downstream side of the heating bypass valve. The heating return pipe can be prevented from freezing, and the heating return pipe on the downstream side of the heating bypass valve can be prevented from freezing due to heat radiation from the hot water storage tank.

Schematic diagram of the invention 1 is a perspective view of a hot water storage unit according to an embodiment of the present invention; FIG. 1 is a front view of a hot water storage unit according to an embodiment of the present invention; FIG. FIG. 2 is an enlarged view of the main part near the medium-temperature water outlet of the embodiment of the present invention;

An embodiment of a water heater of the present invention will be described with reference to FIGS. 1 and 2. FIG.
In FIG. 1, 1 is a hot water storage tank for storing hot water of a hot water storage type hot water supply device, 2 is a bathtub, 3 is a water supply pipe for supplying water to the bottom of the hot water storage tank 1, 4 is a hot water discharge pipe for discharging hot water from the top of the hot water storage tank 1, and 5 is a hot water storage tank. 6 is a heating pipe connecting the lower part of the hot water storage tank 1 and the heating means 5, 7 is a heating circulation pump provided in the middle of the heating pipe 6, 8 is the heating means 4 9 is a heating bypass valve provided in the middle of the heating return pipe 8 , and 10 is a heating bypass pipe branched by switching the heating bypass valve 9 . This heating bypass pipe 10 is connected in the middle of the water supply pipe 3 .

Reference numeral 11 denotes an outside air temperature thermistor provided in the device of the heating means 5 for detecting the outside air temperature;

Reference numeral 13 denotes a medium-temperature hot water discharge pipe that discharges hot water from a medium-temperature water outlet 14 in the middle of the hot water storage tank 1; be.

16 is a water supply bypass pipe bypassed from the water supply pipe 3, 17 mixes the mixed hot water from the intermediate water mixing valve 15 and the water from the water supply bypass pipe 16, and controls the mixing ratio to obtain the desired hot water supply set temperature and temperature. A hot water mixing valve for supplying hot water at a set bath temperature, 18 is a hot water pipe for supplying hot water mixed by the hot water mixing valve 17 to a hot water tap 19 .

A hot water supply flow rate sensor 20 is provided in the middle of the hot water supply pipe 18 and detects the hot water supply flow rate by the rotation speed of the internal impeller. 23 is a water supply thermistor provided in the middle of the water supply pipe 3 to detect the temperature of city water; is.

A bath circulation circuit 25 connects a bath heat exchanger 26 for exchanging heat between the hot water in the hot water storage tank 1 and the circulating hot water in the bath, and the bath tub 2. The bath heat exchanger 26 is connected to the bath return pipe 25b directed to the bathtub 2 so as to be circulatory.

Reference numeral 27 denotes a bath circulation pump provided in the bath circulation circuit 25; 28, a bath flow rate sensor that detects the amount of hot water filled into the bathtub 2 based on the number of revolutions of an internal impeller; Detecting bath temperature thermistor 30 is a water level sensor for detecting the water level in bathtub 2 from the water pressure of hot water, and is provided upstream of bath circulation pump 27 in bath circulation circuit 25 . Since the water level sensor 30 detects the water level in the bathtub 2 from the water pressure of the hot water, the water level cannot be detected if the circulation port of the bathtub 2 is exposed. The water level must be higher than the circulation port.

31 is a hot water supply pipe 31 branched from the middle of the hot water supply pipe 18 and connected to the bath circulation circuit 25 for filling the bathtub 2 with hot water; It is a hot water filling valve that performs a stop.

Reference numeral 33 denotes a control device for controlling hot water supply and bathing, and includes an outside air temperature thermistor 11, a hot water storage temperature thermistor 12, a hot water supply flow rate sensor 20, a hot water supply temperature thermistor 21, a water supply temperature thermistor 23, a bath flow rate sensor 28, a bath temperature thermistor 29, and a water level sensor. 30 is input to drive the heating circulation pump 7, medium/hot water mixing valve 15, hot water mixing valve 17, bath circulation pump 27, and hot water filling valve 32.

Reference numeral 34 is an in-bathroom remote controller that can communicate with the control device 33 and is provided in the bathroom. Operation for setting the set water level, which is the target water level for starting the hot water filling operation and the hot water filling operation, and the set amount of hot water filling, which is the target amount. A display unit 36 for displaying setting contents, and a notification unit 37 for notifying that the hot water filling operation is completed are provided.

Next, the boiling operation will be explained.
When there is a request for boiling, the controller 33 drives the heating circulation pump 7 in the middle of the pipe connecting the hot water storage tank 1 and the heating means 5 to pump up water from the lower part of the hot water storage tank 1 and warm it with the heating means 5. The water in the hot water storage tank 1 is gradually boiled up to high temperature water by continuing the operation of returning the hot water to the upper part of the hot water storage tank 1.例文帳に追加

Next, the hot water supply operation will be described.
When the hot water tap 19 is opened, water is supplied from the water supply pipe 3, flows into the lower part of the hot water storage tank 1, passes through the water supply bypass pipe 16, and the high temperature water pushed out from the upper part of the hot water storage tank 1 and the middle part pushed out from the middle part of the hot water storage tank 1 The mixed water is mixed with hot water by a medium-temperature hot water mixing valve 15, and the mixed water and the water supply of the water supply bypass pipe 16 are mixed by a hot water mixing valve 17, and the hot water supply set temperature and the temperature detected by the hot water supply temperature thermistor 21 are adjusted to be the same. The hot water supplied from the hot water tap 19 is supplied.

In addition, the operation of various devices for the hot water filling operation will be explained.
When the hot water filling switch of the operating portion 35 of the bathroom remote controller 34 is pressed, the control device 33 opens the hot water filling valve 32 to supply water from the water supply pipe 3 and flow into the lower part of the hot water storage tank 1 and the water supply bypass pipe 16 . , the mixed water mixed by the medium-temperature water mixing valve 15 and the water supply of the water supply bypass pipe 16 are mixed by the hot water mixing valve 17, and the bath set temperature and the temperature detected by the bath temperature thermistor 29 are adjusted to be the same. Filling of the hot water is started by flowing the hot water into the bathtub 2.例文帳に追加Then, the bath flow rate sensor 28 detects the flow rate, and when the total integrated value of the flow rate reaches the set amount of hot water filling, the control device 33 closes the hot water filling valve 32 to complete the hot water filling operation. Then, it shifts to automatic keep-warm operation that automatically keeps the bath temperature warm.

Moreover, the reheating operation of the bathtub 2 will be explained.
When the bath temperature detected by the bath temperature thermistor 29 during the automatic heat retention operation falls below a predetermined reheating temperature, or when the reheating switch of the operation unit 35 is pressed, the bath water is supplied to the bathtub 2 through the bath circulation circuit 25. and a bath heat exchanger 26 are circulated to perform heat exchange with the hot water in the hot water storage tank 1 to perform a reheating operation for raising the temperature of the bathtub water in the bathtub 2. - 特許庁When it is confirmed by the detection value of the bath temperature thermistor 29 that the bath temperature has risen to the set temperature, the reheating operation is completed. At this time, medium-temperature hot water is stored in the middle layer of the hot water storage tank 1 due to heat exchange with bathtub water in the reheating operation.

Next, this embodiment will be described in detail with reference to a perspective view of FIG. 2 and a front view of FIG.

First, reference numeral 38 denotes a hot water storage unit including the hot water storage tank 1, various devices, a control device 33, etc.; The heat insulating material 40 has a temperature difference between the temperature of the hot water inside the pipe and the temperature outside the pipe at least like the hot water outlet pipe 4, the heating return pipe 8, the intermediate water hot water outlet pipe 13, and the hot water supply pipe 18, and there is a risk of heat dissipation. It is a pipe insulation wrapped around pipes.

When the temperature in the hot water storage unit 38 drops and reaches a temperature that may freeze the pipes and equipment, the controller 33 performs antifreeze operation to increase the temperature in the hot water storage unit 38. Means 41 are provided.

The intermediate hot water outlet pipe 13 has a horizontal portion 42 extending substantially horizontally from the intermediate hot water outlet 14 and a vertical portion 43 extending upward from the horizontal portion 42 of the hot water storage tank 1 .

Next, the anti-freezing operation will be described in detail. The anti-freezing operation control means 41 draws up water from the lower part of the hot water storage tank 1 by driving the heating circulation pump 7, sends it to the heating means 5 through the heating pipe 6, and prevents freezing. Raise the temperature as high as possible. Furthermore, a heating bypass valve 9 provided in the middle of the heating return pipe 8 branches to the heating bypass pipe 10 and circulates the heated hot water to prevent freezing in the hot water storage unit 38 . Then, it passes through the heating bypass pipe 10, joins the water supply pipe 3 in the middle, and returns to the lower part of the hot water storage tank 1 again.

In this way, the water heated by the heating means 5 circulates through the heating return pipe 8, the heating bypass valve 9, the heating bypass pipe 10, the water supply pipe 3, the lower part of the hot water storage tank 1, the heating feed pipe 6, and the heating means 5. By repeating this, it is possible to prevent freezing of this route and its surroundings.

However, during the freeze prevention operation, the heating bypass valve 9 closes the heating return pipe 8 side and opens the heating bypass pipe 10 side. Since it is away from the path, heat is not transmitted, and since it is closed by the heating bypass valve 9, natural convection does not occur, so a structure for preventing freezing is indispensable.

Therefore, the heating return pipe 8 on the downstream side of the heating bypass valve 9 is arranged so as to pass above the horizontal portion 42 of the intermediate hot water discharge pipe 13 and intersect the horizontal portion 42 .

In this manner, the heating return pipe 8 downstream of the heating bypass valve 9 is passed through the middle upper side of the medium hot water discharge pipe 13 in the vicinity of the horizontal portion 42. Every time hot water is supplied to the hot water outlet pipe 13, heat is radiated from the intermediate hot water outlet pipe 13, so that freezing of the heating return pipe 8 on the downstream side of the heating bypass valve 9 can be prevented.

In addition, at least one of the horizontal portion 42 and the intermediate water outlet 14, and the vicinity of the portion of the heating return pipe 8 intersecting with the horizontal portion 42, are not wrapped with the pipe heat insulating material 40 so that the pipe is partially exposed. ing.

In this manner, the pipe is partially exposed without wrapping the pipe heat insulating material 40 around at least one of the horizontal portion 42 and the medium-temperature water outlet 14, and the vicinity of the portion of the heating return pipe 8 that intersects with the horizontal portion 42. , the heat radiation of the intermediate hot water discharge pipe 13 is efficiently absorbed by the heating return pipe 8 downstream of the heating bypass valve 9, and the freezing of the heating return pipe 8 downstream of the heating bypass valve 9 can be prevented. .

In addition, the structure of the medium-temperature water outlet pipe 13 and the heating return pipe 8 near the medium-temperature water outlet 14 will be described in detail with reference to the enlarged view of FIG.

Reference numeral 44 denotes a heat insulating material hole formed in the molded heat insulating material 39 to connect the medium temperature water discharge pipe 13 to the medium temperature water outlet 14; Exposed can body exposed part, 46 is a medium temperature pipe exposed part where the medium temperature hot water discharge pipe 13 is exposed without wrapping the pipe heat insulating material 40 partially, 47 is the heating return pipe 8 without wrapping the pipe heat insulating material 40 partially. is the exposed portion of the return pipe.

In this manner, at least one of the intermediate temperature pipe exposed portion 46 of the horizontal portion 42 and the can body exposed portion 45 of the intermediate temperature water outlet 14 is exposed, and the vicinity of the heating return pipe 8 and the horizontal portion 42 is exposed to the return pipe. By arranging the portion 47, the heat of the hot water storage tank 1 is generated from at least one of the intermediate temperature pipe exposed portion 46 and the can body exposed portion 45, and the heat is absorbed from the return pipe exposed portion 47, thereby opening the heating bypass valve. Freezing of the heating return pipe 8 downstream of 9 can be prevented.

In addition, by partially exposing the piping, the piping in a remote location where heat radiation does not reach is wrapped with a piping insulation material 40 to prevent heat radiation of hot water and prevent heat radiation from the partially exposed location. Heat radiation from at least one of the horizontal portion 42 and the medium-temperature water outlet 14 can be facilitated.

In addition, by radiating heat from the horizontal portion 42 and warming the exposed portion of the heating return pipe 8 on the downstream side of the heating bypass valve 9, natural convection occurs in the heating return pipe 8, exposing it. Freezing can be prevented by applying heat not only to the portion where the heating return pipe 8 is present but also to the upper portion of the heating return pipe 8. - 特許庁

It should be noted that the present invention is not limited to this embodiment, and it is not intended to prevent modification within the scope of the invention. A two-can type having a plurality of hot water storage tanks 1 may be used, and the same effect can be obtained even with a two-can type hot water storage tank 1. - 特許庁

Also, in the present embodiment, the heating means is explained as a heat pump type heating means, but a combustion type heating means may be used.

In addition, the anti-freezing operation of the present invention is performed in the route of the heating return pipe 8, the heating bypass valve 9, the heating bypass pipe 10, the water supply pipe 3, the lower part of the hot water storage tank 1, the heating pipe 6, and the heating means 5. , the arrangement of the heating bypass valve 9 prevents the heat from being transferred to the downstream side of the heating return pipe 8, and other routes may be used as the anti-freezing operation route.

1 Hot water storage tank 2 Bathtub 3 Water supply pipe 4 Hot water outlet pipe 5 Heating means 6 Heating supply pipe 8 Heating return pipe 9 Heating bypass valve 10 Heating bypass pipe 13 Medium hot water outlet pipe 14 Medium hot water outlet 15 Medium hot water mixing valve 17 Hot water mixing valve 18 Hot water supply pipe 33 Control device 38 Hot water storage unit 40 Pipe heat insulator 41 Freeze prevention operation control means 42 Horizontal part 43 Vertical part 44 Heat insulating material hole 45 Can body exposed part 46 Intermediate temperature pipe exposed part 47 Return pipe exposed part

Claims (2)

a hot water storage tank for storing hot water;
a molded insulation covering the hot water tank;
heating means for heating the water in the hot water storage tank;
a heating supply pipe and a heating return pipe circulatingly connected to the hot water storage tank and the heating means;
a water supply pipe for supplying water to the hot water storage tank;
a hot water outlet pipe for supplying hot water from the top of the hot water storage tank;
a medium-temperature hot water outlet pipe for supplying hot water from a medium-temperature hot water outlet in the middle of the hot water storage tank;
a heating bypass pipe branched from the heating return pipe and connected to the water supply pipe;
a heating bypass valve capable of switching a flow path to the heating bypass pipe in the middle of the heating return pipe;
A water heater provided with a control device for performing a freeze prevention operation in which hot water is circulated through the heating means, the heating return pipe, the heating bypass valve, the heating bypass pipe, the water supply pipe, the lower part of the hot water storage tank, and the heating supply pipe. in
The molded heat insulating material has a heat insulating material hole for connecting the intermediate hot water outlet pipe and the intermediate hot water outlet,
The medium-temperature hot water outlet pipe has a horizontal portion extending substantially horizontally from the medium-temperature water outlet, and a vertical portion extending from the horizontal portion toward the top of the hot water storage tank,
The heating return pipe on the downstream side of the heating bypass valve is disposed so as to pass through the upper vicinity of the horizontal portion and the upper vicinity of the heat insulating material hole, and to intersect the horizontal portion ,
A water heater, wherein the hot water storage tank and the heating return pipe are connected at a position higher than a position where they intersect with the horizontal portion. The heating return pipe is provided with a pipe heat insulating material to prevent heat dissipation of hot water passing through the pipe,
The pipe heat insulating material is not provided at least one of the horizontal portion and the medium-temperature hot water outlet, and the vicinity of the portion of the heating return pipe that intersects the horizontal portion of the medium-temperature hot water outlet pipe. The water heater according to claim 1, characterized by:

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