JP2008196816A - Hot water supply apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply apparatus, favorably performing negative pressure release on the water supply side and discharge of drain water. <P>SOLUTION: In this hot water supply apparatus, a back flow preventing device 6 having a function of supplying hot water and filling a bathtub with hot water, and inhibiting back flow of bathtub water to the water supply side in the negative pressure state of the water supply side, is provided in the apparatus 1. The apparatus includes a connector 10 having hose connecting parts 8, 9 inside the apparatus 1 and outside the apparatus 1, which connects a drain water discharge opening 7 of the back flow preventing device 5 and a drain hose 13 outside of the apparatus 1. The connector 10 is provided with an air supply opening 14, and a bead 15 is formed with a width equal to that of the air supply opening 14 on the inside upper part of the air supply opening 14, whereby negative pressure on the water supply side is favorably released and drain water is favorably discharged. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus that is installed outdoors and has a risk of freezing.

Conventionally, this type of hot water supply apparatus is equipped with a connector and a drain hose for discharging hot water in the appliance to the outside of the appliance, and drains hot water that is not necessary when the appliance is stopped. It was. (For example, refer to Patent Document 1.)
JP-A-10-288404

  By the way, with this conventional one, if the drain outlet into which the drain hose is inserted freezes, if this drain hose communicates with the backflow prevention device, air cannot be supplied even in the negative pressure state on the water supply side, The negative pressure state could not be eliminated, and in the worst case, there was a danger that the bath water would be mixed into the water supply.

  Therefore, in order to solve the above-described problems, the present invention has a structure that particularly has a hot water filling function and a hot water filling function for the bathtub, and prevents back flow from flowing back to the water supply side in a negative pressure situation on the water supply side. In the apparatus provided with an apparatus in the apparatus, the apparatus further comprises a connection tool having a hose connection portion inside and outside the apparatus connecting the drain water discharge port of the backflow prevention apparatus and the drain hose outside the apparatus, and this connection The tool is provided with an air supply port, and a bead is formed at the inner upper portion of the air supply port with the width of the air supply port.

  According to this invention, even when the drainage port is frozen and the drainage hose is blocked, even if the water supply side is in a negative pressure state, the negative pressure state is eliminated by sucking air from the air supply port of the connector. The water from the bathtub is prevented from flowing back to the water supply side, and can always be used with peace of mind. Also, the drain water from the backflow prevention device circulates in the connector having the air supply port. Is disturbed by the bead, and the air supply port portion will circulate away from the air supply port, and even if the air supply port is formed, there is no worry of drain water leaking from here, drain water is also good drainage Is to be done.

Next, an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a hot-water appliance body, which is fixedly installed on an outdoor wall or the like. A water supply pipe 2, a hot-water supply pipe 3, a bath outlet pipe 4, and a bath return pipe 5 are connected to the bottom of the appliance 1 respectively. In addition, although not shown in the instrument 1, a heating burner, a can, a heat exchanger, etc. are provided, and hot water supply to a suitable place, bathing, hot water filling and heat insulation are performed. .

  6 is a backflow prevention device provided in the hot water filling circuit, which is composed of two check valves, an electric on-off valve and a negative pressure release valve, and is opened to the atmosphere when the water supply side is in a negative pressure state due to water shutoff or the like. The negative pressure is released to prevent the bath water from entering the city water. The drain water discharge port 7 of the backflow prevention device 6 and the connection provided with the hose connection portions 8 and 9 inside and outside the appliance 1 The tool 10 is connected via a drain pipe 11, and the connection tool 10 to a drain port 12 are connected by a drain hose 13.

  14 is a connecting tool 10 formed on the opposing side wall of the hose connecting portion 9 outside the instrument 1 and two air supply ports, and the release of the negative pressure state is performed by inflowing air from here. One bead 15 extending from the air supply port 14 to the upper end of the inner wall of the connector 10 is formed above the air supply port 14.

  Next, the operation of this embodiment will be described. When the water supply side is in a negative pressure state due to water breakage or the like on the water supply side, the backflow prevention device 6 operates to supply air via the drain pipe 11. Therefore, even if air flows in from the two air supply ports 14 of the connector 10 and the negative pressure state on the water supply side is eliminated, even if the drainage hose 13 and the drainage port 12 are blocked by freezing or the like. Air can be supplied to the water supply side, and the negative pressure state on the water supply side, which is an emergency situation, can be surely eliminated, so that it can be used with peace of mind.

  In addition, drain water flows out from the backflow prevention device 6 that is in a communication state due to the inflow of air from the air supply port 14, and this drain water flows into the hose connection portion 9 through the drain pipe 11. Here, since there is a bead 15 on each air supply port 14, drain water circulates avoiding the bead 15, so there is no fear of drain water leaking from the air supply port 14. The water is drained from the drainage port 12 through.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the hot-water supply apparatus which shows one Embodiment of this invention. Front sectional drawing of the connection tool of the principal part. Side surface sectional drawing of the connection tool of the principal part. Sectional view on the AA line of the connection tool of the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot-water supply apparatus main body 6 Backflow prevention apparatus 7 Drain water discharge port 8, 9 Hose connection port 10 Connector 13 Drain hose 14 Air supply port 15 Bead

Claims (1)

  In the apparatus having a hot water filling function and a hot water filling function to the bathtub, and provided with a backflow prevention device in the apparatus for preventing the bathtub water from flowing back to the water supply side in a negative pressure situation on the water supply side, A connector with a hose connection is provided inside and outside the appliance connecting the drain water discharge port and the drainage hose outside the appliance. A hot water supply apparatus characterized in that a bead is formed at the upper portion with the width of the air supply opening.

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