JP2014219145A - Hot water storage water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage water heater capable of suppressing excessive pressure increase in a pipe.SOLUTION: A hot water storage water heater comprises: a hot water storage tank 2 storing hot water; a hot water outlet pipe 7 connected to an upper portion of the hot water storage tank 2 to cause the hot water to flow out from the upper portion of the hot water storage tank 2; a water supply pipe 11 connected to a lower portion of the hot water storage tank 2 and supplying water to the lower portion of the hot water storage tank 2; a mixture valve 4 mixing up the hot water flowing in the hot water outlet pipe 7 and the water flowing in a water supply bypass pipe 8 branching from the water supply pipe 11; a hot water supply pipe 9 causing the hot water mixed in the mixture valve 4 to flow to a hot water terminal 12; a first check valve 14 provided on the hot water outlet pipe 7 upstream of the mixture valve 4; and a second check valve 6 provided on the water supply bypass pipe 8 upstream of the mixture valve 4. The first check valve 14 has a pressure relaxing function, so that the first check valve 14 can release a pressure generated by freezing of the water in the hot water supply pipe 9 to a pipe on the hot water supply tank 2 side and suppress an excessive pressure increase in the pipe.

Description

  The present invention relates to a hot water storage type hot water supply apparatus.

  Conventionally, this type of hot water supply apparatus includes a hot water storage tank unit 101 and heating means 113 such as a heat pump apparatus, as shown in FIG. Water heated by being sent to the heating means 113 from the lower part of the hot water storage tank unit 101 flows into the hot water storage tank 102 from the upper part of the hot water storage tank 102 and is stored therein.

  The hot water storage tank unit 101 includes a hot water storage tank 102, a hot water supply pipe 107 that causes hot water stored in the upper part of the hot water storage tank 102 to flow to the hot water supply terminal 112, a water supply pipe 111 that supplies water from the water pipe to the lower part of the hot water storage tank 102, A water supply bypass pipe 108 branched from the pipe 111 and connected to the hot water supply pipe 107 via the mixing valve 104, and a hot water supply pipe 109 through which the hot water flowing from the hot water storage tank 102 and the water flowing from the water supply bypass pipe 108 are mixed flows. It has. The hot water storage tank unit 101 also includes a pressure relief valve 103 that alleviates excessive pressure rise.

  Further, a check valve 105 or 106 is provided in the hot water supply pipe 107 and the water supply bypass pipe 108 on the upstream side of the mixing valve 104 in order to prevent the backflow of hot water in the hot water supply apparatus (for example, Patent Documents). 1).

  In addition, in order to prevent water remaining in the hot water supply pipe 109 from freezing and the hot water supply pipe 109 from becoming overpressure and causing damage to the piping member, the hot water pipe 109 branches off and pressure is released in the middle. Some have a valve 110 and a pressure relief pipe 115 whose tip is open to the atmosphere (see, for example, Patent Document 2).

JP 2012-007646 A JP 2010-002061 A

  However, in the conventional configuration, when water staying in the pipe between the pressure relief valve provided in the drain pipe and the check valve provided on the upstream side of the mixing valve is frozen, an excessive pressure is generated in the pipe. In some cases, the piping member is damaged.

  This invention is for solving the said conventional subject, and it aims at providing the hot water storage type hot-water supply apparatus which can suppress the excessive pressure rise inside piping, even when the water which stayed in piping frozen. .

In order to solve the above-described conventional problems, a hot water storage type hot water supply apparatus of the present invention includes a hot water storage tank for storing hot water, and a hot water outlet pipe connected to the upper part of the hot water storage tank from which hot water flows out from the upper part of the hot water storage tank. A water supply pipe connected to the lower part of the hot water storage tank for supplying water to the lower part of the hot water storage tank, hot water flowing through the hot water supply pipe, and water flowing through a water supply bypass pipe branched from the water supply pipe A hot water supply pipe in which hot water mixed in the mixing valve flows to a hot water supply terminal, a first check valve provided in the hot water supply pipe upstream of the mixing valve, and upstream of the mixing valve And a second check valve provided in the water supply bypass pipe, wherein the first check valve has a pressure relaxation function.

  Thereby, even if a pressure rises inside the hot water supply pipe, the pressure can be released to the hot water storage tank side by the first check valve having a pressure relaxation function.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage type hot-water supply apparatus which suppressed the excessive pressure rise in the inside of piping can be provided.

Schematic block diagram in Embodiment 1 of the hot water storage type hot water supply apparatus of the present invention Schematic block diagram in Embodiment 1 of the hot water storage type hot water supply apparatus of the present invention Schematic configuration diagram of a conventional hot water storage type hot water supply device

  1st invention is connected to the hot water storage tank which stores hot water, the hot water storage pipe connected to the upper part of the said hot water storage tank, hot water flows out from the upper part of the said hot water storage tank, and the lower part of the said hot water storage tank, A water supply pipe for supplying water to the lower part of the tank, a mixing valve for mixing hot water flowing through the hot water supply pipe and water flowing through a water supply bypass pipe branched from the water supply pipe, and hot water mixed by the mixing valve A hot water supply pipe flowing to the terminal, a first check valve provided in the hot water supply pipe upstream of the mixing valve, and a second check valve provided in the water supply bypass pipe upstream of the mixing valve And a first check valve having a pressure relaxation function.

  Thereby, in particular, even when the water staying inside the pipe from the mixing valve to the hot water supply pipe freezes and the pressure inside the pipe rises, the pressure relief function is moved to the hot water storage tank side by the first check valve. Therefore, it is possible to release the pressure, so that an excessive increase in pressure inside the pipe can be suppressed. As a result, it is possible to prevent breakage of parts such as the mixing valve and the check valve.

  The second invention is characterized in that, in the first invention, in particular, the second check valve has a pressure relaxation function.

  As a result, the first check valve and the second check valve allow pressure to escape from both the hot water inlet side and the water inlet side of the mixing valve to the hot water storage tank side. Therefore, while suppressing the excessive pressure rise inside piping, the shape of a mixing valve and the freedom degree of an arrangement method can be made high, and a mixing valve thru | or a 1st check valve and a 2nd check valve are united. The hot and cold water mixing device can be further downsized.

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

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a hot water storage type hot water supply apparatus according to the present embodiment.

  As shown in FIG. 1, a hot water storage type hot water supply apparatus 100 includes a hot water storage tank unit 1 and a heating means 13 for heating water.

  The hot water storage tank unit 1 includes a hot water storage tank 2 for storing hot water. The hot water storage tank 2 is supplied with water from the water pipe to the lower part of the hot water storage tank 2 by a water supply pipe 11 connected to the lower part of the hot water storage tank 2.

  The water stored in the hot water storage tank 2 flows through the incoming water piping 21 connecting the lower part of the hot water storage tank 2 and the heating means 13 for heating the water, and is sent to the heating means 13. The water inlet pipe 21 is provided with a circulation pump (not shown) that pumps water to the heating means 13. As the heating means 13, a heat pump device, a gas boiler, or the like is used.

  The water heated in the heating means 13 flows through the water discharge pipe 22 that connects the heating means 13 and the upper part of the hot water storage tank 2, and flows into the hot water storage tank 2 from the upper part of the hot water storage tank 2. Thereby, the hot water stored in the hot water storage tank 2 has a temperature stratification in which the temperature decreases from the upper side to the lower side.

  Hot water stored in the upper part of the hot water storage tank 2 flows out of the hot water storage tank 2 through a hot water discharge pipe 7 connected to the upper part of the hot water storage tank 2. Further, a first pressure relief pipe 23 is provided which branches off from the hot water supply pipe 7 and has a pressure relief valve 3 whose tip is open to the atmosphere. The pressure relief valve 3 has a function of releasing pressure when hot water is stored in the hot water storage tank 2 and the pressure in the hot water storage tank 2 and the surrounding piping is increased.

  Hot water that has flowed out of the hot water storage tank 2 into the hot water discharge pipe 7 flows into the hot water inlet side of the mixing valve 4. On the other hand, water flowing from the feed water bypass pipe 8 branched from the feed water pipe 11 and connected to the water inlet side of the mix valve 4 flows into the water inlet side of the mixing valve 4. The mixing valve 4 mixes the hot water flowing through the hot water supply pipe 7 and the water flowing through the feed water bypass pipe 8 into hot water having a predetermined temperature. The mixed hot water flows from the outlet side of the mixing valve 4 to the hot water supply pipe 9 connecting the outlet side of the mixing valve 4 and the hot water supply terminal 12 such as a curan and flows to the hot water supply terminal 12.

  A check valve (first check valve) 14 is provided in the vicinity of the mixing valve 4 in the hot water supply pipe 7 upstream of the mixing valve 4. The check valve 14 prevents a large amount of hot water from flowing back from the mixing valve 4 toward the upper portion of the hot water storage tank 2. Further, the check valve 14 has a pressure relaxation function for releasing the pressure to the upstream side of the check valve 14 when the pressure inside the piping on the downstream side of the check valve 14 increases excessively.

  A check valve (second check valve) 6 is provided in the vicinity of the mixing valve 4 in the water supply bypass pipe 8 upstream of the mixing valve 4. The check valve 6 prevents a large amount of hot water from flowing back from the mixing valve 4 toward the lower portion of the water supply pipe 11 and the hot water storage tank 2.

  Further, a second pressure relief pipe 24 is provided which branches from the hot water supply pipe 9 and includes a check valve (third check valve) 10 whose tip is open to the atmosphere. The check valve 10 prevents a large amount of hot water flowing through the hot water supply pipe 9 from being discharged through the second pressure relief pipe 24. Further, the check valve 10 has a pressure relaxation function for releasing the pressure to the tip of the second pressure relief pipe 24 when the pressure inside the hot water supply pipe 9 rises excessively.

  The water supplied to the hot water storage tank 2 through the water supply pipe 11 is usually at a low temperature. Therefore, when the water in the hot water storage tank 2 is heated by the heating means 13 to become hot water, its volume expands. As a result, the pressure inside the hot water storage tank 2 and the surrounding pipes increases.

  Here, when the pressure in the hot water storage tank 2 and the surrounding pipes becomes equal to or higher than a predetermined pressure, the expansion water is discharged from the pressure relief valve 3 and the hot water pressure in the hot water tank unit 1 can be adjusted. As a result, parts can be protected from an excessive pressure rise inside the pipe.

  When the user opens a hot water supply terminal 12 such as a curan and uses hot water of a predetermined temperature, the high temperature water stored in the hot water storage tank 2 is mixed from the upper part of the hot water storage tank 2 via the hot water supply pipe 7. It flows to 4. At the same time, water flows through the water supply pipe 11 and the water supply bypass pipe 8 and flows into the mixing valve 4. In the mixing valve 4, hot water flowing through the hot water supply pipe 7 and water flowing through the water supply bypass pipe 8 are mixed to form hot water having a predetermined temperature and flow out to the hot water supply pipe 9. Hot water at a predetermined temperature is supplied to the hot water supply terminal 12 via the hot water supply pipe 9.

  Here, for example, when the outside air temperature is very low, water remaining in the hot water supply pipe 9 may be frozen. When freezing occurs, an excessive pressure is generated inside the hot water supply pipe 9 due to the volume expansion of water due to freezing. If the hot water supply pipe 9 is a closed circuit, the volume expansion of the water may cause damage to the hot water supply pipe 9 or parts constituting the pipe due to excessive pressure, causing water leakage. In the hot water storage type hot water supply apparatus in the present embodiment, a second pressure relief pipe 24 branched from the hot water supply pipe 9 is provided, and the check valve 10 having a pressure relaxation function is disposed in the second pressure relief pipe 24.

  Here, when water freezes inside the hot water supply pipe 9 upstream of the place where the second pressure relief pipe 24 branches from the hot water supply pipe 9, the frozen place, the check valve 14 and the check valve 6. An excessive pressure is generated in the pipe between the two because of the volume expansion of water due to freezing. If freezing occurs upstream of the branch point of the second pressure relief pipe 24, if the hot water supply pipe 9 is a closed circuit, an excessive pressure is generated due to the volume expansion of the water, and this pressure causes the pipe or pipe to be expanded. The parts that make up may be damaged, causing water leakage.

  Therefore, in the present embodiment, the check valve 14 provided at least on the hot water inlet side of the mixing valve 4 has a pressure relaxation function. As a result, when the water remaining in the pipe is frozen upstream of the branch point from the hot water supply pipe 9 of the second pressure relief pipe 24 and the pressure inside the pipe reaches a predetermined pressure, the check valve 14 stores the hot water storage. Pressure can be released to the tank 2 side.

  The check valve 14 with the pressure relaxation function is installed on the hot water inlet side of the mixing valve 4 when the temperature of the hot water supply pipe 7 and the supply water bypass pipe 8 is compared. This is because the risk of freezing is low.

  In general, the interior of the hot water storage tank unit 1 is shielded from the outside air, and hot water is stored in the hot water storage tank 2 so that it is closer to the hot water storage tank 2 than piping outside the hot water storage tank unit 1. The piping to be used is less likely to become colder and the possibility of freezing is low. Therefore, by letting the pressure escape to the piping on the hot water storage tank 2 side where the possibility of freezing is low, it is possible to suppress the progress of freezing and prevent an excessive increase in pressure inside the piping.

  Further, when the pressure inside the pipe becomes higher, the pressure can be released by the pressure relief valve 3 provided in the first pressure relief pipe 23 branched from the hot water delivery pipe 7. Thereby, the pressure rise in the hot water storage tank 2 and the pipes provided in the hot water storage tank unit 1 is suppressed, and the pipes and the parts constituting the pipes including the pipes around the mixing valve 4 are prevented from being damaged and leaking water. be able to. At this time, when another check valve is provided in the hot water supply pipe 7, it is preferable that the check valve is also provided with a pressure relaxation function.

  In addition, it is preferable that the check valve 14 and the check valve 6 are provided below the check valve 14 in the vertical direction. Thereby, the water remaining without freezing in the hot water supply pipe 9 flows toward the upstream side of the hot water supply pipe 7 near the upper part of the hot water storage tank 2 through the check valve 14 having a pressure relaxation function. Therefore, the progress of further freezing can be suppressed, and an excessive increase in pressure can be suppressed.

  In the hot water supply apparatus, the mixing valve is provided not only for supplying hot water to the hot water supply terminal 12, but also for bath pouring (not shown) for supplying hot water of a predetermined temperature to the bathtub. There may be. In this case, the configuration of the mixing valve 4 and its surrounding piping may become complicated and large, and the storage property in the hot water storage tank unit 1 and the maintenance performance of the mixing valve 4 and its surroundings may deteriorate.

  Therefore, it is desirable that the pipe connection member such as the mixing valve 4 and the check valves 6 and 14 are further downsized. In that case, it is effective that the check valves 6 and 14 are integrated with the mixing valve 4 to form the hot and cold mixing device 30.

  On the other hand, if the mixing valve 4 and the check valves 6 and 14 are integrated to form the hot and cold mixing device 30, the degree of freedom may be reduced in the direction and arrangement of the two check valves, the vertical relationship during installation, and the like. is there.

  For example, since the hot water storage type hot water supply device 100 is not used for a long period of time, when all the water staying in the hot water storage tank unit 1 is to be drained, the mixing valve 4 and the check valves 6 and 14 are integrated. If the hot water mixing device 30 is used, water may remain in the hot water mixing device 30. Thereby, when water freezes in the hot water mixing apparatus 30 and between the mixing valve 4 and the check valve 6, excessive pressure is applied to the hot water mixing apparatus 30, which may lead to damage.

  Therefore, as shown in FIG. 2, a check valve 15 having a pressure relaxation function may be provided in the feed water bypass pipe 8. Thereby, since the freedom degree of the shape, arrangement | positioning, and structure of the hot-water mixing apparatus 30 becomes high, freezing can be prevented while miniaturizing the hot-water mixing apparatus 30, and the excessive pressure rise inside piping can be suppressed.

  As described above, the hot water storage type hot water supply apparatus of the present invention is useful as a hot water supply apparatus for home use and business use because it can suppress an excessive pressure rise inside the pipe due to freezing of residual water.

2 Hot water storage tank 4 Mixing valve 6, 10, 14, 15 Check valve 7 Hot water supply piping 8 Water supply bypass piping 9 Hot water supply piping 11 Water supply piping 12 Hot water supply terminal 13 Heating means

Claims (2)

A hot water storage tank for storing hot water,
A hot water outlet pipe connected to the upper part of the hot water storage tank, from which hot water flows out from the upper part of the hot water storage tank,
A water supply pipe connected to the lower part of the hot water storage tank to supply water to the lower part of the hot water storage tank;
A mixing valve that mixes the hot water flowing through the hot water supply pipe and the water flowing through the water supply bypass pipe branched from the water supply pipe;
A hot water supply pipe in which hot water mixed in the mixing valve flows to a hot water supply terminal;
A first check valve provided in the outlet piping upstream of the mixing valve;
A second check valve provided in the feed water bypass pipe upstream of the mixing valve, wherein the first check valve has a pressure relaxation function,
Hot water storage water heater. The hot water storage type hot water supply apparatus according to claim 1, wherein the second check valve has a pressure relaxation function.