JP2006349200A - Piping built-in storage type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping built-in storage type hot water supply device capable of preventing breakage of a hot and cold water mixer or a flow rate detector made of resin even when a water heater body is not energized and neglected during winter, or when draining is not carried out. <P>SOLUTION: The piping built-in storage type hot water supply device is provided with a hot water storage tank 6 heating internal water by a heating means 17 and storing it as hot water, a water supply pipe arrangement 3 sending water of a water source, a tank lower part water supply pipe 5a branched off from the water supply pipe arrangement 3 to send water to the hot water storage tank 6, a hot water supply pipe arrangement 8 sending the hot water stored in the hot water storage tank 6, the hot and cold water mixer 11 made of resin mixing the water of the water supply pipe arrangement 3 and the hot water of the hot water supply pipe arrangement 8, the flow rate detector 12 made of resin detecting a hot water amount from the hot and cold water mixer 11, and a mixed outgoing hot water pipe arrangement 13 sending mixed hot water from the hot and cold water mixer 11. An air accumulation part 15 absorbing volume expansion during freezing is provided in a mixed outgoing water pipe arrangement 13 midway part in a downstream side of the hot and cold water mixer 11 and the flow rate detector 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a domestic hot water storage hot water supply apparatus with a built-in piping mainly using an electric heater or a heat pump unit as a heat source.

  In conventional hot water storage hot water supply systems with built-in piping, in order to prevent freezing of pipes in the main unit in winter, the main unit power supply can be energized even when the main unit is not used, Water is drained. In the hot water storage type hot water supply apparatus with a built-in pipe, the water source side is constituted by a casting or a copper product, but synthetic resin parts are often used on the hot water supply side. The synthetic resin component may be damaged by volume expansion due to freezing, but an air chamber for absorbing the volume expansion during freezing is provided inside the synthetic resin component (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-281157 (page 2-3, FIG. 2)

  In the hot water storage hot water supply system with built-in piping, if it is left in the hot water storage tank without being drained without turning on the power supply in winter, etc., the hot water supply port or water supply port made of copper alloy that contacts the main body outer plate The temperature of the hot water supply pipe and the water supply pipe connected to the hot water supply port and the water supply port decrease, and the internal water freezes. The water supply piping section is not blocked even when frozen, but the mixed hot water piping section is closed, so the volume expansion during freezing is added to the synthetic resin hot water mixer and flow rate detector connected in front of it. Concentrated, causing damage and cracks, which could cause water leakage. Moreover, in order to prevent it, if an air chamber that absorbs volume expansion during freezing is provided inside a hot water / water mixer or flow rate detector, the parts themselves will become large, so the arrangement of parts may be limited, There was a problem that the cost of the parts themselves increased.

  The present invention has been made in order to solve the above-mentioned problems, and even when the hot water supply body is left unpowered in the winter or the like, or even when draining is not performed, the mixed hot water is used. An object of the present invention is to provide a hot water storage hot water supply device with a built-in pipe that can prevent a hot water / water mixer and a flow rate detector made of synthetic resin connected to the pipe from being damaged.

  A hot water storage apparatus with built-in piping according to the present invention is a hot water storage tank that heats internal water by heating means and stores it as hot water, a water supply pipe that sends water from the water source, a branch from the water supply pipe, and water to the hot water storage tank. It detects the amount of hot water from the lower tank water supply pipe, the hot water supply pipe that sends hot water stored in the hot water storage tank, the synthetic resin hot water mixer that mixes the water in the water supply pipe and the hot water supply pipe, and the hot water mixer It is equipped with a flow sensor made of synthetic resin and a mixed hot water pipe that feeds the mixed hot water from the hot water mixer, and when the water in the mixed hot water pipe is frozen, the hot water mixer and hot water detector made of synthetic resin are frozen. In order to prevent breakage, an air reservoir that absorbs volume expansion during freezing is installed in the middle of the mixed hot water supply piping located downstream of the hot water mixer and flow rate detector, and the hot water mixer and hot water detector during freezing are installed. To prevent damage caused by freezing One in which the.

  According to the pipe built-in hot water storage hot water supply apparatus according to the present invention, even when the water heater main body is left without being energized in the winter or when it is not drained, it is connected to the mixed hot water pipe. Due to the air reservoir, the hot water mixer and the flow rate detector made of synthetic resin are not damaged by the volume expansion of water due to freezing.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a pipe built-in hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. In the figure, a hot water storage tank 6 is provided in the water heater main body 1, and a heating element 17, which is a heating means for boiling the tank hot water to a predetermined temperature, is attached in the hot water storage tank 6. A water supply port 2 connected to the primary water source A is provided in the water heater main body 1, and the water supply port 2 and the pressure reducing valve 4 are connected by a water supply pipe 3. A tank lower water supply pipe 5a branched from here and connected to the lower part of the hot water storage tank 1 is provided from the pressure reducing valve 4, and passes through the pressure reducing valve 4 from the water supply port 2 and via the tank lower water supply pipe 5a. Water is supplied to the tank 6. The tank lower water supply pipe 5 a connected to the hot water storage tank 6 is provided with a drain valve 7 for draining hot water in the hot water storage tank 6.

  The water heater main body 1 is further provided with a synthetic resin hot water / water mixer 11 which mixes hot water stored in the hot water storage tank 6 with water from the water supply pipe 3 to set a predetermined temperature. A tank upper water supply pipe 5 b branched from the pressure reducing valve 4 is connected to the water side of the mixer 11, and a hot water supply pipe 8 extending from the upper part of the hot water storage tank 6 is connected to the hot water side of the hot water mixer 11. The first and second check valves 10a and 10b are respectively installed in the hot water supply pipe 8 and the tank upper water supply pipe 5b at the portion where the hot water mixer 11 is connected to the hot water supply pipe 8 and the tank upper water supply pipe 5b. ing. The hot water supply pipe 8 is provided with a relief valve 9 for discharging the expanded water when the water in the hot water storage tank 2 is boiled.

  A flow rate detector 12 made of synthetic resin for detecting the flow rate discharged from the hot water mixer 11 is provided on the downstream side of the hot water mixer 11, and the flow rate detector is provided on the downstream side of the hot water mixer 11 and the flow rate detector 12. A mixed hot water supply pipe 13 that connects 12 to the hot water supply port 14 is installed. From the hot water supply port 13, the system piping work is connected to the curan and the shower port B in the house. An air reservoir 15 made of a pipe for holding air is connected to the mixed hot water supply pipe 13. For example, as shown in FIG. 2, the air reservoir 15 is constituted by a pipe having an approximately L shape branched from the mixed hot water piping 13, and is connected to the mixed hot water piping 13 by, for example, a brazing 16. A standing pipe 15a that communicates with the mixed hot water piping 13 and rises upward, and is formed substantially parallel to the mixed hot water piping 13 toward the upstream side of the mixed hot water piping 13 from the standing pipe 15a. The parallel tube 15b is closed by the air pipe, and a certain predetermined length is secured and air is sealed inside. The bent portion 15c extending from the standing pipe 15a to the parallel pipe 15b is formed in an arc shape.

The bent portion 15c from the standing tube 15a of the air reservoir portion 15 to the parallel tube 15b may be formed to have a right angle instead of an arc shape. In addition, the air reservoir 15 is formed in an approximately L shape, but may have other shapes as long as the air can be sealed inside.
In this way, the air reservoir 15 only has to be branched from the mixed hot water piping 13 to ensure a predetermined length and close the end, and the branched portion with the mixed hot water piping 13 should be integrated by brazing or the like. It is also possible, it can be configured very simply, and the cost can be suppressed.

  Next, the operation of the piping built-in hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention will be described. Immediately after the installation of the water heater main body 1, water is supplied into the hot water storage tank 6 from the water supply port 2 in order to perform a trial operation. When not using immediately after the end of the trial run, the water in the hot water storage tank 6, the water supply pipe 3, the hot water supply pipe 8 and the mixed hot water supply pipe 13 is drained from the drain valve 7, or the power supply is energized as it is.

  If the power supply is not energized and left in winter without draining the hot water storage tank 6, the temperature of the water supply port 2 and the hot water supply port 14 that are in contact with the outer plate will drop, and the inside of the pipe will freeze. There is a case. Although the water supply port 2 side is not damaged because the second check valve 10b is in the forward direction even if the inside is frozen, the hot water supply port 14 side is the first check valve in front of the hot water mixer 12. Since it is closed by 10a, the volume expansion during freezing is absorbed by the air reservoir 15 in the middle of the mixed hot water piping 13, and the flow rate detector 12 and the hot water mixer 11 made of synthetic resin in front of it are damaged. Can be reliably prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the piping built-in type hot water storage hot water supply apparatus which concerns on Embodiment 1 of this invention. It is a block diagram of the air reservoir part of FIG.

Explanation of symbols

1 Water heater body, 2 water supply port, 3 water supply piping, 4 pressure reducing valve, 5a tank lower water supply piping, 5b tank upper water supply piping, 6 hot water storage tank, 7 drain valve, 8 hot water supply piping, 9 relief valve, 10a, 10b 1st , Second check valve, 11 hot water mixer, 12 flow rate detector, 13 mixed hot water piping, 14 hot water supply port, 15 air reservoir, 17 heating element (heating means).

Claims (2)

A hot water storage tank that heats internal water by heating means and stores it as hot water, a water supply pipe that sends water from the water source, a tank lower water supply pipe that branches from this water supply pipe and sends water to the hot water storage tank, and the hot water storage tank A hot water supply pipe for sending stored hot water, a synthetic resin hot water mixer for mixing the water in the water supply pipe and the hot water in the hot water supply pipe, and a synthetic resin flow rate detector for detecting the amount of hot water from the hot water mixer And a mixed hot water supply pipe for feeding the mixed hot water from the hot water mixer,
A hot water storage hot water supply apparatus with a built-in pipe, wherein an air reservoir for absorbing volume expansion at the time of freezing is provided in the middle of the mixed hot water supply pipe on the downstream side of the hot water mixer and the flow rate detector. 2. The piping built-in hot water storage type hot water supply apparatus according to claim 1, wherein the mixed hot water supply pipe and the air reservoir are integrally formed by piping.

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