JP2019138587A - Water heater - Google Patents

Abstract

To eliminate a problem in which a water supply pipe that supplies water from the lower part of a hot water storage tank to the hot water storage tank branches into several places to supply water, if the pipe is connected by welding the water pipe to match the branching point, the water pipe will become long, since it becomes a large piping group that is branched into multiple, it is difficult to remove the water supply pipe during maintenance, and the water supply pipe can only be removed after removing other equipment and piping.SOLUTION: A water heater comprises: a second three-way joint 34B provided downstream from the branch point between a water supply pipe 2 and a water supply bypass pipe; a heat bypass pipe 9 branched from the middle of a heat return pipe 7 and connected to the second three-way joint 34B; a third three-way joint 34C provided downstream of the second three-way joint 34B in the middle of the water supply pipe 2; a drain pipe 28 branched from the third three-way joint 34C; and a drain valve 29 provided in the middle of the drain pipe 28, in which the second three-way joint 34B and the third three-way joint 34C are connected to a pipeline with a piping quick fastener 35.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hot water storage type water heater.

  Conventionally, hot water in a hot water storage tank of this type and water supplied are mixed by a hot water supply mixing valve and passed through a hot water supply pipe, and hot water is supplied by a water supply in a disaster caused by an earthquake. However, a hot water storage type hot water heater that can drain water in a hot water storage tank from a drain pipe by performing a predetermined operation has been known (Patent Document 1).

Japanese Patent Laying-Open No. 2015-102285

  However, the water supply pipe that supplies water to the hot water storage tank from the lower part of the hot water storage tank is branched into several places to supply water, and when the water supply pipe is welded and connected to the branch, the water supply pipe becomes longer. Since it becomes a large pipe group branched into a plurality of parts, it is difficult to remove the water supply pipe at the time of maintenance, and there is a problem that the water supply pipe can be removed only after removing many parts and pipes.

  In addition, a drainage valve is provided in the middle of the drainage pipe that branches from the water supply pipe. Since the drainage pipe in front of the drainage valve has little water flow except in an emergency, water tends to accumulate for a long time. When the length of the drainage pipe is long, there is a problem that the positive possibility that a hole is opened in the copper pipe due to corrosion increases.

  In order to solve the above-mentioned problems, the present invention provides a hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, and hot water from the hot water storage tank. A hot water pipe that connects the heating means and the lower part of the hot water storage tank, a heating return pipe that connects the heating means and the upper part of the hot water storage tank, and a branch from the water supply pipe to the hot water pipe The second three-way joint provided downstream from the branch point between the feed water bypass pipe to be joined and the feed water bypass pipe of the feed water pipe, and the heating bypass branched from the middle of the heating return pipe and connected to the second three-way joint A pipe, a third three-way joint provided downstream of the second three-way joint in the middle of the water supply pipe, a drain pipe branched from the third three-way joint, and a drain valve provided in the middle of the drain pipe The second Square joint, third three-way joint has to be connected to the pipe in a piping Kuikku fastener.

  The third three-way joint is made of resin, and the third three-way joint and the drain valve are directly connected.

  Thus, according to the invention of claim 1, by connecting the pipe branching and joining from the water supply pipe which is a water supply path with the three-way joint, it is possible to easily separate the pipe branching and joining at the time of maintenance, By adopting a structure that makes it easy to remove the water supply pipe, maintainability can be improved and work time can be shortened.

  Further, the water supply pipe is branched to the drain pipe by the three-way joint, and is arranged so that the drain valve is provided immediately after branching, and can prevent water from accumulating for a long time, The water accumulated upstream of the drain valve can be prevented from being accumulated for a long period of time by being stirred by the flow of water when the hot water tank is supplied, and for a long period of time in the drain pipe branched from the water supply pipe. By eliminating the state of no water movement, it is possible to prevent the pipe from corroding and opening a hole.

Schematic explanatory diagram of the water heater of the present invention Sectional view of the water heater of the present invention Explanatory drawing of the main part of the pipe branching or joining from the water supply pipe of this invention

An embodiment of a hot water supply apparatus of the present invention will be described with reference to FIGS. 1 and 2.
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 water supply pipe for supplying water to the bottom of the hot water storage tank 1, 3 is a hot water discharge pipe for discharging hot water from the top of the hot water storage tank 1, and 4 is for heating water in the hot water storage tank. Heat pump type heating means 5, 5 is a heating forward pipe connected to the lower part of the hot water storage tank 1 and the heating means 4, 6 is a heating circulation pump provided in the middle of the heating forward pipe 5, and 7 is the heating means 4 and the hot water storage tank 1. A heating return pipe connecting the upper portion of the heating return pipe, 8 is a heating bypass three-way valve provided in the middle of the heating return pipe 7, and 9 is a heating bypass pipe branched by switching of the heating bypass three-way valve 8. The heating bypass pipe 9 is connected to the water supply pipe 2.

  Reference numeral 10 denotes a hot water supply side water supply bypass pipe that branches in the middle of the water supply pipe 2, and 11 denotes hot water supply that mixes hot water flowing through the hot water discharge pipe 3 and city water flowing through the hot water supply side water supply bypass pipe 10 at an appropriate ratio to adjust to the hot water supply set temperature. A mixing valve, 12 is a hot water supply pipe through which the mixed water mixed in the hot water supply mixing valve 11 flows, 13 is a hot water supply tap for supplying mixed water from the hot water supply pipe 12, and 14 is a hot water supply flow rate provided in the middle of the hot water supply pipe 12 The flow sensor 15 is a hot water temperature sensor 15 for detecting the temperature of the mixed water mixed by the hot water mixing valve 11, and the flow rate adjusting valve 16 is for adjusting the hot water flow rate of the mixed water mixed by the hot water mixing valve 11.

  Reference numeral 17 denotes a bath-side water supply bypass pipe bypassed from the water supply pipe 2, and 18 denotes hot water from the hot water discharge pipe 3 and water from the bath-side water supply bypass pipe 17, and the mixing ratio is controlled to obtain a desired bath. A bath mixing valve for supplying a set temperature, 19 is a hot water pipe for supplying hot water mixed by the bath side mixing valve 18 to the bathtub 20, and 21 is a bath flow rate provided in the middle of the hot water pipe 17. A flow sensor 22, a bath temperature sensor 22 for detecting the temperature of the mixed water mixed by the bath-side mixing valve 16, and a flow rate adjusting valve 23 for adjusting the bath flow rate of the mixed water mixed by the bath mixing valve 18.

  A water supply pressure reducing valve 24 is provided in the middle of the water supply pipe 2 to reduce the city water to a constant water supply pressure, 25 is a water supply thermistor provided in the middle of the water supply pipe 2 to detect the temperature of the city water, and 26 is an upper part of the hot water storage tank 1. A relief valve 27 that is provided in communication with the valve and can be manually opened and closed, and 27 is a water tap that can be manually operated to open or shut off the water supply.

  Reference numeral 28 denotes a drain pipe connected to the bottom of the hot water storage tank 1 and installed in the middle of the water supply pipe 2, and a drain valve 29 capable of manually opening and closing the drain pipe 28 is provided in the middle of the drain pipe 28.

  Further, when a disaster such as an earthquake occurs and the water is cut off, the water tap 27 is shut off, the relief valve 26 is opened, and the drain valve 29 is opened, so that the hot water remaining in the hot water storage tank 1 is opened. Can be taken out.

  The water supply pipe 2 is branched or joined to a plurality of pipes on the way and connected to the lower part of the hot water storage tank 1. The pipe branched from the water supply pipe 2 supplies water to the hot water mixing valve 11 and the bath mixing valve 18. A hot water supply water supply bypass pipe 10 for supplying city water from the pipe 2 and a hot water supply bypass pipe communicating with the bath water supply bypass pipe 17, and a drain pipe 27 for draining hot water in the hot water storage tank 1 to the outside of the tank such as in an emergency such as an earthquake. There is.

  In addition, the pipe that joins the water supply pipe 2 includes a heating bypass pipe 9 through which high-temperature water heated by the heating means 4 flows during the freeze prevention operation described later.

  Next, the control device 30 responsible for the operation control of the hot water supply operation and the bath operation has a valve opening degree of the flow rate adjustment valve 16 so that the arbitrarily determined hot water supply set flow rate and the detection value detected by the flow sensor 14 are equal, The valve opening degree of the hot water supply mixing valve 11 is controlled so that the arbitrarily determined hot water temperature and the detected value detected by the hot water temperature sensor 15 are equal.

Next, the hot water supply operation will be described.
When the hot-water tap 13 is opened, city water flows into the bottom of the hot water storage tank 1 from the water supply pipe 2 and hot water is discharged from the top of the hot water storage tank 1 through the hot water discharge pipe 3. It is mixed with water from the water supply bypass pipe 10 and passes through the hot water supply pipe 12. And the control apparatus 30 controls the valve opening degree of the hot water supply mixing valve 11 so that the detected value detected by the hot water supply temperature sensor 15 coincides with the hot water supply set temperature, and performs hot water supply at the hot water supply set temperature. Further, when adjusting the hot water supply flow rate, the control device 30 performs hot water supply by controlling the valve opening degree of the flow rate adjusting valve 16 so that the detected value detected by the flow sensor 14 coincides with an arbitrary hot water supply set flow rate. When the hot water tap 13 is closed, the control device 30 stops the control of the valve opening of the hot water mixing valve 11 and stops hot water supply.

  When the outside air temperature falls below a predetermined temperature, the control device 30 switches the heating bypass three-way valve 8 to the heating bypass pipe 9 side, drives the heating circulation pump 6, starts heating the heating means 4, and is heated. By supplying the high temperature water to the heating bypass pipe 9, anti-freezing operation control means 31 is provided that prevents freezing of the equipment and piping in the hot water storage unit by the high temperature water passing through the heating bypass pipe 9.

  Moreover, after the high-temperature water supplied to the heating bypass pipe 9 in the freeze prevention operation radiates heat to the equipment and piping in the hot water storage unit, the heating bypass pipe 9 merges with the water supply pipe 2, and the hot water storage tank 1 starts from the lower part of the hot water storage tank 1. The hot water is stored again.

  FIG. 2 is a front view of the first embodiment. 32 is a tank unit that encloses the hot water storage tank 1 and a large number of parts and pipes, 33 is a pipe in the tank unit 32 (water supply pipe 2, hot water supply pipe 12, heating forward pipe 5, heating return pipe 7) and external pipes corresponding thereto. The connection port mounting brackets are provided so that the connection ports for connecting the two and the like are concentrated and are provided so as to protrude to the front surface side at a slightly higher position from the lowest surface of the tank unit 32.

Next, a specific piping layout for the first embodiment will be described based on FIG.
34 is a three-way joint made of resin and connected to each of the three pipes. The first three-way joint 34A is branched from the water supply pipe 2 to the water supply bypass pipe. A second three-way joint 34B that joins the remaining hot water, and a third three-way joint 34C that branches from the water supply pipe 2 to the drain pipe 28 side.

  Further, the water supply pipe 2 that is the upstream portion of the water supply pipe 2 and extends from one end of the water supply pipe 2 to the first three-way joint 34A is connected to the water supply upstream pipe 2A and the second three-way joint 34B and the third three-way, which are the midstream portions of the water supply pipe 2. The feed water pipe 2 that connects the joint 34C is the feed water downstream pipe 2B, the downstream portion of the feed water pipe 2, and the feed water downstream pipe 2C that is the feed water pipe 2 that connects the lower part of the hot water storage tank 1 from the third three-way joint 34C.

  The water supply path to the lower part of the hot water storage tank 1 is composed of a water supply upstream pipe 2A, a first three-way joint 34A, a second three-way joint 34B, a water supply flow pipe 2B, a third three-way joint 34C, and a water supply downstream pipe 2C. Yes.

  As described above, the second three-way joint 34B is disposed above the connection port mounting bracket 33, the third three-way joint 34C is disposed below the connection port mounting bracket 33, and the water supply pipe 2B is a vertical piping having no branching element. It is said.

  In addition, each pipe is inserted into the connection end of the three-way joint 34, and the flange at the connection end and the pipe end flange of the three-way joint 34 are pressed by the pipe quick fastener 35 so that the pipe does not come off from the three-way joint. Yes.

  Further, in this embodiment, in order to easily attach and detach the water supply pipe 2 and the three-way joint 34, a pipe quick fastener 35 is used instead of welding or screw connection.

  Thus, the water supply path for supplying water to the lower part of the hot water storage tank 1 has many branches and merges. When the water supply pipe 2 is welded and the heating bypass pipe 9 and the drain pipe 28 are integrally formed, the length of the water supply flow pipe 2B becomes longer. When removing the water supply pipe 2 at the time of maintenance, it is difficult to remove the water supply pipe 2 due to the obstruction of the connection port mounting bracket 33 extending sideways of the tank unit 32, but at the place where the water supply pipe 2 branches or merges as in this embodiment Since the three-way joint 34 is provided, the water supply pipe 2B arranged so as to straddle the connection port mounting bracket 33 is isolated from the branch element even when the connection port mounting bracket 33 is present, and a large number of parts must be removed. Thus, the water supply pipe 2 can be easily removed, the maintainability is improved, and the working time can be shortened.

  Next, when a disaster such as an earthquake occurs and the water is cut off, the hot water in the hot water storage tank 1 is taken out by shutting off the water tap 27 and opening the relief valve 26 and opening the drain valve 29. Thus, the water in the hot water storage tank 1 is drained in an emergency when hot water remaining in the hot water storage tank 1 is taken out.

  Thus, the water supply pipe 2 can be branched to the drain pipe side by the third three-way joint 34C, and the drain valve 29 provided in the middle of the drain pipe 28 is opened to drain the water in the hot water storage tank 1 in an emergency. Water can be secured.

  Further, water is drained from a drain outlet located at the tip of the drain pipe 28 on the downstream side of the drain valve 29, but the water flows on the upstream side of the drain valve 29 only during emergency drainage. Although it was a cause that the drain pipe 28 stays rusted for a long time, the drain pipe 28 is branched from the water supply pipe 2 to the drain pipe 28 by the third three-way joint 34C, and the drain valve 29 is provided immediately after the branch. In addition, water can be prevented from accumulating for a long period of time, and the water accumulated upstream of the drain valve 29 is agitated by the flow of water at the time of water supply in the hot water storage tank 1 and the water is accumulated for a long period of time. Can be prevented.

  Further, the third three-way joint 34C and a drain valve provided with the drain valve 29 may be directly connected to prevent water from accumulating for a long period of time and to collect upstream from the drain valve 29. The water is agitated by the flow of water when the hot water storage tank 1 is supplied, and water can be prevented from accumulating for a long time.

  Further, since the three-way joint 34 is made of a resin material, there is no fear of rusting like a copper pipe, and it is possible to prevent the pipe from being corroded and opening a hole.

  In addition, this invention is not limited to embodiment, It does not prevent changing in the range which does not change a summary, for example, the heating bypass pipe 9 does not connect piping, but the three-way coupling 34B and heating bypass A three-way valve 8 may be directly connected.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 3 Hot water supply pipe 10 Hot water supply side water supply bypass pipe 11 Hot water supply mixing valve 12 Hot water supply pipe 26 Relief valve 28 Drain pipe 29 Drain valve 30 Control device 34 Three-way joint 34A First three-way joint 34B Second three-way joint 34C Third Three-way fitting

Claims (2)

A hot water storage tank for storing hot water,
Heating means for heating the hot water in the hot water storage tank;
A water supply pipe for supplying water to the hot water storage tank;
A tapping pipe for tapping hot water from the hot water storage tank;
A heating forward pipe connecting the heating means and the lower part of the hot water storage tank;
A heating return pipe connecting the heating means and the upper part of the hot water storage tank;
A water supply bypass pipe branched from the water supply pipe and joined to the hot water pipe;
A second three-way joint provided downstream from a branch point of the water supply pipe with the water supply bypass pipe;
A heating bypass pipe branched from the middle of the heating return pipe and connected to the second three-way joint;
A third three-way joint provided downstream of the second three-way joint in the middle of the water supply pipe;
A drain pipe branched from the third three-way joint;
A drain valve provided in the middle of the drain pipe,
The hot water storage type hot water heater is characterized in that the second three-way joint and the third three-way joint are connected to the pipe by a pipe quick fastener. The hot water storage type hot water heater according to claim 1, wherein the third three-way joint is formed of a resin, and the third three-way joint and the drain valve are directly connected to each other.

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