JP2011075150A - Instantaneous water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instantaneous water heater quickly storing hot water in a hot water storage tank without making electric control. <P>SOLUTION: In an initial state, hot water in the hot water storage tank has a near-cold water state. When a user presses a hot water supply switch or a reheating switch of a water heater 200 to have a bath, hot water supply to a bathtub or reheating of hot water is started. A temperature detecting means detects reheating or hot water supply, and drain valves 109A, 109B, 109C, ... are opened. Hot water supply to the instantaneous water heater is started from the water heater, a low-cut valve detects the water from the hot water storage tank, water-side direction valves 106A, 106B, 106C, ... are opened, and the water in the hot water storage tank is discharged to the bathtub. The water discharged into the bathtub can be effectively utilized without being disposed of, and without lowering a temperature of the hot water in the bathtub as a volume of the tank is only about 2% of a volume of the bathtub. When water inside of the hot water storage tank gets hot, the low-cut valve detects the hot water, a hot water-side direction valve is opened, and the hot water can be immediately supplied from a water faucet. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an instant water heater, and more particularly to an instant water heater in which a hot water storage tank for storing hot water is disposed in the middle of a hot water supply pipe connecting a hot water supply device and a hot water tap of a terminal.

As a conventional quick water heater, there is one having a structure in which the temperature is increased by exchanging heat in a hot water storage layer inside the quick water heater using a supplementary piping from a water heater to a bathtub (for example, see Patent Document 1).
However, in this case, although it is a device used in a bathtub, since electronic control is entered, the structure of electrical insulation becomes very complicated in order to prevent electric shock. Moreover, when raising the temperature of the hot water storage tank of the instant water heater in the initial stage, there is a problem that it takes a long time to raise the temperature because of heat exchange with water and hot water filling or cooking temperature. In addition, there is a problem that it is not possible to immediately give the hot water tank a quantity of heat that is higher than the temperature at which heat can be exchanged at the hot water filling or additional cooking temperature.

Also, a structure is known in which cold water inside a pipe from a water heater to an immediate water heater is taken into the immediate water heater, and hot water stored in advance in the heat insulating container of the immediate water heater is discharged from the faucet (for example, , See Patent Document 2).
However, in this case, it is necessary to store hot water in the water heater immediately before using the water heater on that day (for example, the last day of use the previous day). There is a need to store hot water, and the water heater must be set at a temperature higher than the proper temperature for discharging water from the faucet, which causes problems such as burns caused by hot water discharged from the tap.

JP 2004-218882 A JP 2007-139381 A

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an instant water heater that can quickly store hot water in a hot water storage tank without using electrical control.

  In order to achieve the above object, according to the first aspect of the present invention, a hot water inlet connected to the upstream hot water supply pipe connected to the water heater, and a hot water outlet connected to the downstream hot water supply pipe connected to the hot water tap, A hot water storage tank, a switching valve disposed in the downstream hot water supply pipe, a drainage pipe connected to the switching valve, and in order from the upstream side, a drainage valve and a first check valve, A hot water supply pipe connected to a water heater and a bathtub and provided with a temperature detection means, wherein the switching valve senses the hot water temperature of the downstream hot water supply pipe, and the temperature of the hot water is a predetermined temperature. If the temperature is lower than the temperature, the hot water is drained to the drain pipe, the drain valve is driven mechanically in conjunction with the temperature detecting means, and the drain pipe is disposed in the hot water pipe. An instant water heater characterized by being connected to the hot water piping between the temperature detection means and the bathtub.

  This instant water heater does not have an electrical mechanism around the water such as a bathtub, and does not require electrical insulation, and can be configured with a simple structure. Therefore, it can be realized at a low cost. Also, when the temperature of the hot water in the hot water heater is raised in the initial stage, the remaining water in the hot water storage tank is discarded and hot water is supplied from the water heater. It can be used effectively.

  According to a second aspect of the present invention, there is provided a heat detection type bypass valve that connects a hot water inlet and a hot water outlet of the hot water storage tank without using the hot water storage tank depending on the temperature of the upstream hot water supply pipe. An instant water heater according to claim 1 is provided.

  In this instant water heater, when the hot water storage tank is hot and the hot water supply pipe from the hot water heater to the instant hot water is also hot, the hot water is discharged from the faucet. By passing through the heat detection type bypass valve, the hot water from the water heater can be taken out to the faucet as a tap without any increase in pressure loss via the hot water storage tank. Made it possible.

  According to a third aspect of the present invention, the instant hot water according to claim 1 or 2, wherein a second check valve is provided downstream of the temperature detecting means disposed in the hot water filled pipe. It was a vessel.

In this instant water heater, when the temperature detection means is installed at a position lower than the draft surface of the bath water in the vertical direction, the hot water of the bathtub or hot water flows back to the instant water heater side by the head pressure of the bath water, The temperature of hot water convects. In this situation, the temperature detecting means erroneously detects that hot water filling in the bathtub is continued, and the drain valve is always opened. Then, when leakage of hot water from the low temperature switching valve occurs during hot water from the tap as a hot tap, the hot water flows out into the bathtub, and the amount of hot water from the tap as a hot tap decreases.
In order to solve this problem, a second check valve is provided between the temperature detection means and the bathtub to prevent the hot water or hot water from flowing back to the temperature detection means or the temperature of the hot water from convection. It becomes possible to do.

  According to the present invention, it is possible to provide an instant water heater that can quickly store hot water in a hot water tank without using electrical control.

It is a schematic diagram which illustrates the structure of the instant water heater which concerns on the 1st Embodiment of this invention. It is a schematic diagram which illustrates the structure of the instant water heater which concerns on the 2nd Embodiment of this invention. It is a schematic diagram which illustrates the structure of the instant water heater which concerns on the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view illustrating the configuration of the instant water heater according to the first embodiment of the invention. In FIG. 1, 100A indicates an instant water heater, 200 indicates a water heater, 300 indicates a mixed water tap as a tap, and 400 indicates a bathtub. A water supply pipe 1 is extended from a water supply pipe (water supply source) (not shown), a water supply pipe 2 branched from the middle of the water supply pipe 1 is connected to a water supply connection port 201 of a water heater 200, and water is supplied. It is connected to the water supply connection port 301 of the mixing faucet 300 as it is.

  The hot water supply pipe 3 extending from the hot water supply connection port 202 of the water heater 200 is connected to the hot water supply connection port 103 </ b> A of the switching valve 102 </ b> A connected to the hot water storage tank 101 </ b> A in the immediate hot water heater 100.

  The connection piping 4 connected from the hot water connection port 104A of the switching valve 102A leads to the low cut valve 105A. The low-cut valve 105A, which is a switching valve, opens the water-side directional valve 106A when the temperature is lower than the set temperature (in this case, 40 ° C., which is suitable for a shower), and the hot-water directional valve 107A The structure is open.

  The hot water filling pipe 7 is connected to a bath connection port 203 of the water heater 200 and is connected to a bathtub connecting metal fitting 401 provided in the bathtub 400 to supply hot water to the bathtub 400 or supply hot water during cooking. Do. The bath return pipe 8 is connected to the bath return connection port 204 of the water heater 200 and is connected to a bathtub connecting fitting 401 provided in the bathtub 400, and performs a function of returning hot water from the bathtub 400 to the water heater during additional cooking. .

  A hot water supply pipe 5 is connected downstream of the hot water side direction valve 107 </ b> A of the low cut valve 105 </ b> A and is connected to the hot water supply connection port 302 of the mixing tap 300. The drain pipe 6 is connected to the water side direction valve 106A of the low cut valve 105A and communicates with the hot water filled pipe 7.

  A drain valve 109 </ b> A is provided in the middle of the drain pipe 6. The drain valve 109A is mechanically interlocked with a temperature detection unit 110A provided in the middle of the hot water piping, and when the temperature detection unit 110A detects the passage of hot water, the drain valve 109A opens the valve. Further, when the temperature detection unit 110A detects that the passage of hot water is completed, the drain valve 109A closes the valve.

  A first check valve 111A is provided downstream of the drain valve 109A. 111 A of 1st non-return valves are provided in order to prevent that the bathtub water of the bathtub 400 flows in into a clean water, and is contaminated.

  Next, the operation of the instant water heater of this embodiment will be described.

  In the initial state, the inside of the hot water storage tank 101A is close to hot water. In order for the user to take a bath, hot water filling or additional cooking is started in the bathtub 400 by pressing a hot water filling switch or additional cooking switch of the water heater 200 (not shown).

  The temperature detection means 110A detects additional cooking or hot water filling, and opens the drain valve 109A. Hot water is supplied to the hot water heater 100A from the hot water heater 200, and the low cut valve 105A, which is a switching valve, detects water from the hot water storage tank 101A, opens the water side direction valve 106A, and supplies the water in the hot water storage tank 101A. Drain into bathtub 400. Since the volume of the tank is only about 2% of the volume of the bathtub, the water drained into the bathtub should be effectively utilized without lowering the temperature of the hot water in the bathtub 400 and without throwing away the drained water. I can do it.

  When the hot water storage tank 101A becomes hot, the low cut valve 105A detects hot water, opens the hot water side direction valve 107A, and the hot water can be immediately discharged from the faucet 300.

  When the cooking of the bathtub 400 is finished, the temperature detection means 110A detects that hot water has not passed, and closes the drain valve 109A. The low cut valve 105A, which is a switching valve, detects hot water from the hot water storage tank 101A, and the hot water side direction valve 107A remains open. When the water discharge handle 303 of the faucet 300 is opened, the hot water from the water heater 200 passes through the hot water storage tank 101A, the hot water connection port 104A of the switching valve 102A, and the hot water side direction valve of the low cut valve 105A that is the switching valve. The water passes through 107A, is supplied to the hot water supply connection port 302 of the faucet 300, mixes water and hot water from the water supply pipe 1, and discharges water from the water outlet 304 or the shower 305.

  When the use of the faucet 300 is stopped for a while, the temperature of the hot water supply pipe 3 and the hot water supply pipe 5 is lowered to become residual water.

  When the water discharge handle 303 of the faucet 300 is opened and water discharge is resumed, the remaining water from the upstream hot water supply pipe 3 is supplied to the hot water storage tank 101A of the instant water heater 100A. Hot water from the hot water storage tank 101A is discharged from the instant water heater 100A, and the low cut valve 105A, which is a switching valve, detects hot water and opens the hot water direction valve 107A. Hot water from the instant water heater 100 </ b> A and water from the water supply pipe 1 are mixed and discharged from the water outlet 304 or the shower 305.

  FIG. 2 is a schematic view illustrating the configuration of an instant water heater according to the second embodiment of the invention. Differences from the first mode will be described.

  In FIG. 2, the switching valve 102B connected to the hot water storage tank 101B inside the instant water heater 100B is directly connected to the hot water storage tank 101B in the hot water supply connection 103B and the hot water connection port 104B in the first embodiment. However, when it is detected that hot water is supplied from both the hot water supply connection 103B and the hot water connection port 104B, the heat detection type bypass valve 108B is opened, the conduction to the hot water storage tank 101B is cut off, and the hot water supply connection 103B and the hot water connection port 104B. Are short-circuited and connected.

  Next, differences in operation from the first embodiment will be described.

  When the cooking of the bathtub 400 is finished, the temperature detection means 110B detects that hot water has not passed, and closes the drain valve 109B. The low cut valve 105B detects hot water from the hot water storage tank 101B, and the hot water direction valve 107B remains open. When the water discharge handle 303 of the faucet 300 is opened, the hot water from the water heater 200 passes through the hot water connection port 104A of the switching valve 102B via the bypass valve 108B in the switching valve 102B, and further, the low cut valve 105A which is a switching valve. The hot water side direction valve 107 </ b> A is supplied to the hot water supply connection port 302 of the faucet 300, water from the upstream water supply pipe 1 and hot water are mixed, and water is discharged from the water outlet 304 or the shower 305.

  If hot water storage tank 101B is filled with hot water and hot water supply pipe 3 on the upstream side is hot, hot water from water heater 200 can be used as is from faucet 300. In this case, if hot water is supplied to the faucet 300 via the hot water storage tank 101A as in the first embodiment, pressure loss is caused, and the usability at the faucet 300 is impaired. Therefore, in the second embodiment, when the bypass valve 108B is provided in the switching valve 102B, the hot water storage tank 101B is filled with hot water, and the upstream hot water supply pipe 3 is also hot, the bypass valve The hot water from the water heater 200 can be directly supplied to the faucet 300 via 108B.

  FIG. 3 is a schematic view illustrating the configuration of an instant water heater according to the third embodiment of the invention. Differences from the second mode will be described.

  In FIG. 3, a second check valve 112C is added downstream of the temperature detection means 110C. The second check valve 112 </ b> C erroneously detects that the bathtub water in the bathtub 400 flows back to the temperature detection means 110 </ b> C and is always supplied from the water heater 200 to the hot water filling pipe 7, and opens the drain valve 109 </ b> C. It plays a role in preventing things. Thereby, even if the hot water heater 100C is not installed so that the temperature detecting means 110C is above the draft surface 402 of the bathtub, the hot water in the bath does not flow back and is not erroneously detected, and the degree of freedom in construction is high. growing.

DESCRIPTION OF SYMBOLS 1, 2 ... Water supply piping 3, 5 ... Hot water supply piping 4 ... Connection piping 6 ... Drain piping 7 ... Hot water filling piping 8 ... Bath return piping 100A, 100B, 100C ... Instant water heaters 101A, 101B, 101C ... Hot water storage tanks 102A, 102B , 102C ... switching valves 103A, 103B, 103C ... hot water supply connection ports 104A, 104B, 104C ... hot water connection ports 105A, 105B, 105C ... low cut valves 106A, 106B, 106C ... water side direction valves 107A, 107B, 107C ... hot water side direction Valve 108B, 108C ... Bypass valve 109A, 109B, 109C ... Drain valve 110A, 110B, 110C ... Temperature detection means 111A, 111B, 111C ... First check valve 112C ... Second check valve 200 ... Hot water supply 201 ... Water supply connection Mouth 202 ... Hot spring connection port 203 ... Bath connection port 204 ... Bath return connection port 00 ... water mixing 301 ... water connection port 302 ... hot water connection ports 303 ... water discharge handle 304 ... spout 305 ... Shower 400 ... tub 401 ... tub fitting 402 ... draft surface

Claims (3)

A hot water storage tank having a hot water inlet connected to an upstream hot water supply pipe connected to the water heater, and a hot water outlet connected to a downstream hot water supply pipe connected to the hot water tap;
A switching valve disposed in the downstream hot water supply pipe, a drain valve connected to the switching valve, and in order from the upstream side, a drain pipe having a first check valve disposed therein, the water heater and the bathtub A hot water filled pipe connected and provided with temperature detecting means,
The switching valve senses the hot water temperature of the downstream hot water supply pipe, and if the temperature of the hot water temperature is equal to or lower than a predetermined temperature, the hot water is drained to the drain pipe,
The drain valve is driven mechanically in conjunction with the temperature detection means,
The hot water heater is characterized in that the drain pipe is connected to the hot water pipe between the temperature detecting means and the bathtub arranged in the hot water pipe.   2. The instant water heater according to claim 1, further comprising a heat detection type bypass valve that connects a hot water inlet and a hot water outlet of the hot water storage tank without using the hot water storage tank depending on the temperature of the upstream hot water supply pipe. .   The instant hot water heater according to claim 1 or 2, wherein a second check valve is provided on the downstream side of the temperature detecting means provided in the hot water filled pipe.

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