JP2007120083A - System for using water before boiled - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use a water before boiled which has been drained wastefully by using a system for using water before boiled formed in a simple structure and manufacturable with reduced cost. <P>SOLUTION: This system comprises a water storage tank 28 connected to a pipe 14 for hot water supply on the downstream side of a faucet for hot water supply to store cold water passing through the faucet 16 for hot water supply when a hot-water supply device 12 is started to operate and an opening/closing valve 32 installed between the portion of the water storage tank connected to the pipe for hot water supply and a faucet 26. A reduced-diameter part 34a narrowing a flow passage near the portion of the pipe for hot water supply to which the water storage tank is connected is formed in the pipe for hot water supply. The hot water flowing in the pipe for hot water supply increases its flow velocity in the reduced-diameter part to draw the cold water stored in the water storage tank to the pipe for hot water supply by ejector effect. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a hot water waiting water utilization system for recovering and effectively using hot water waiting water that has been wastedly drained from a faucet at the time of startup of a water heater.

FIG. 5 shows a general configuration of a domestic hot water supply / water supply facility.
The hot water supply equipment is roughly a hot water supply 101 connected to the hot water supply 101 connected to the hot water heater 101 for introducing cold water from the water main main pipe 102 and warming the cold water, and a hot water supply faucet 107 a for opening and closing provided in the hot water supply pipe near the faucet 105. It is composed of On the other hand, the water supply facility includes a cold water pipe 103b for introducing cold water from the water main pipe 102 and a cold water faucet 107b for opening and closing the cold water pipe 103b. The hot water supply facility and the water supply facility constitute an integrated hot water supply / water supply facility, and hot water flowing through the hot water supply pipe 103a and cold water flowing through the cold water pipe 103b are mixed at the faucet 105 portion, etc., so that hot water having a desired temperature is supplied from the faucet. Is to be hot water.

  Therefore, when the hot water heater starts up, that is, until the hot water of the desired temperature is obtained after the hot water tap is opened, the cold water and low temperature accumulated in the hot water pipe connecting the hot water heater and the faucet are mainly used. The hot water must be completely drained, and the cold water and low temperature hot water (referred to as “hot water waiting water”) have been wasted without being used so far.

Thus, for example, in the “cold water recovery system” disclosed in Patent Document 1, the hot water supply pipe 103a piped from the hot water heater 101 and connected to the hot water faucet 107a is disposed immediately before the hot water faucet 107a in order to eliminate such waste of hot water waiting water. The water collecting branch pipe 108 and the water recovery branch pipe 109 are branched into two flow paths, and the water recovery branch pipe 109 is provided with an on-off valve 111 so that the hot water is supplied to the recovered water storage tank 113. The led invention is disclosed (see FIG. 6).
JP 2004-124425 A

  However, in the invention described in Patent Document 1, the use of hot water awaited in the recovered water storage tank is limited to the use of toilet flushing water, watering the garden, and the like. It was necessary to connect the water storage tank to the toilet, and to pump out hot water from the recovered water storage tank. For this reason, there are problems such as the cost of piping to the toilet and the need for pumping.

  The present invention was devised in view of the above-mentioned problems, and the purpose of the present invention is to provide hot water waiting water that has been drained until the hot water having a desired temperature is obtained after the water tap has been opened. The purpose is to use it effectively using a hot water standby system that is simple and inexpensive to manufacture.

  In order to achieve the above object, a hot water waiting water utilization system according to claim 1 includes a hot water supply pipe (14) piped from a hot water heater (12), a hot water faucet (16) for opening and closing thereof, and a water main pipe. A cold water pipe (22) piped from (18), a cold water faucet (24) for opening and closing the same, and a faucet (26) for flowing out the hot water supply pipe and the cold water pipe by mixing hot water and cold water. A hot water waiting water use system applied to a hot water supply / water supply facility having water storage connected to a hot water supply pipe downstream of the hot water tap in order to store cold water that has passed through the hot water tap at the time of startup of the water heater A tank (28), and an on-off valve (32) provided between a faucet and a portion where the water storage tank is connected to the hot water supply pipe, and the water storage tank is connected to the hot water supply pipe Narrow-diameter part that narrows the flow path in the vicinity of the part 34a) is formed, and the hot water flowing in the hot water supply pipe is accelerated in the narrow-diameter portion, and the cold water stored in the water storage tank is sucked into the hot water supply pipe by the ejector effect. To do.

  Moreover, the hot water waiting-water utilization system of Claim 2 is piped from the hot water supply pipe (14) piped from the hot water heater (12), the hot water supply faucet (16) for opening and closing thereof, and the water main pipe (18). A hot water supply / water supply facility having a cold water pipe (22) and a cold water faucet (24) for opening / closing the pipe, and a faucet (26) for mixing and flowing out the hot water supply pipe and the cold water pipe by mixing hot water and cold water. Applicable hot water waiting system, for storing cold water that has passed through a hot water faucet when the water heater starts up, for hot water piping downstream of the hot water faucet and for cold water downstream of the cold water faucet A water storage tank (28) connected to the pipe, and an on-off valve (32) provided between the faucet and a portion where the water storage tank is connected to the hot water supply pipe. , In the vicinity of the part where the water storage tank is connected A narrow-diameter portion (34b) that narrows the path is formed, and the chilled water flowing in the chilled water pipe increases the flow velocity in the narrow-diameter section, and the chilled water stored in the water storage tank is made into the chilled water pipe by the ejector effect. It is characterized by sucking.

  Here, in the invention described in claim 3, in the invention described in claim 2, for the hot water supply of the cold water stored in the water storage tank in the portion where the water storage tank (28) is connected to the hot water supply pipe (14). A check valve (36) for preventing outflow to the pipe is provided.

  Further, as described in claim 4, the on-off valve (32) is a thermostat valve that opens when water in the hot water supply pipe (14) reaches a predetermined temperature, or as in claim 5. It is preferable that the valve is an interlocking valve that opens in conjunction with the amount of water stored in the water storage tank (28).

According to the first aspect of the present invention, hot water waiting until the hot water having a proper temperature is supplied from the water heater after the water tap is opened is temporarily stored in the water storage tank, and the hot water having the proper temperature is supplied. When this happens, open the on-off valve and supply hot water from the faucet. Here, the hot water pipe near the part where the hot water storage tank is connected is formed with a narrow diameter part that narrows the flow path, and the flow rate of the hot water flowing through here is temporarily increased, so that the hot water is stored in the water storage tank. The hot water waiting water can be sucked into the hot water supply pipe side by the ejector effect, and the hot water waiting water in the water storage tank can be mixed with hot water and discharged from the faucet.
When the flow rate of hot water is small, the ejector effect is also small, so that the hot water aspirated per unit time is small, and the temperature of the hot water does not drop so much that the temperature of the hot water affects the sensible temperature due to the cold water mixed with the hot water. On the other hand, when the flow rate of hot water is large, the ejector effect is also large, and the hot water awaited from the storage tank per unit time increases, but the cold water is diluted into a large amount of hot water, so the temperature of the hot water does not drop greatly. .
In the present invention, the structure is simple because it merely forms a narrow-diameter portion in the hot water supply pipe near the part to which the hot water storage tank is connected, such as a pipe or a pump for using hot water waiting water in a toilet or the like. However, there is an advantage that the introduction cost is low.

  According to the invention of claim 2, hot water waiting water is temporarily stored in a water storage tank, and the stored hot water waiting water is sucked into the water supply pipe side by the ejector effect of the cold water flowing through the cold water pipe. The hot water stored in the water storage tank can be discharged with the outflow of the cold water accompanying the opening of the cold water faucet. If hot water waiting water is sucked into the water supply pipe in this way, cold water can be drained from the water storage tank and used without affecting the temperature of the hot water in the hot water supply pipe.

  In the third aspect of the present invention, by providing a check valve at a portion where the water storage tank is connected to the hot water supply pipe, the hot water stored in the water storage tank is sucked only to the cold water pipe side and flows out. , It will not flow out into the hot water supply piping.

  According to invention of Claim 4, the thermostat valve which opens the on-off valve provided in the hot water supply piping downstream of the hot water supply tap when the water in the hot water supply piping reaches a predetermined temperature (for example, about 42 ° C.), By doing so, hot water can be automatically taken out from the faucet when the temperature reaches an appropriate temperature, and comfortable housework and the like can be performed.

According to the fifth aspect of the present invention, the open / close valve is an interlocking valve that opens in conjunction with the amount of water stored in the water storage tank, that is, the open / close valve is opened when the water storage tank is almost full. Thus, hot water having an appropriate temperature can be automatically taken out from the faucet, and comfortable housework work can be performed.
Note that the amount of hot water awaiting hot water from the faucet when the water heater starts up varies slightly depending on the seasonal water temperature fluctuation, but the water storage capacity of the water storage tank should be optimized for the winter season. For example, comfortable housework can be done in any season.

A hot water waiting water utilization system according to the present invention includes a hot water supply pipe piped from a water heater and a hot water tap for opening and closing thereof, a cold water pipe piped from a water main and a cold water tap for opening and closing thereof, and a hot water supply Hot water awaiting water that has been often drained wastefully so far, that is, used for hot water and water supply equipment having a faucet that mixes and flows out hot water and cold water from a hot water pipe and a cold water pipe. Cold water accumulated in the hot water supply pipe at the time of starting up the water heater and flowing water (cold water) for several seconds required for warm-up operation of the water heater are temporarily stored and used.
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a conceptual diagram for illustrating the structure of a hot water waiting water utilization system of the first embodiment. As shown in the figure, the hot water-waiting-water utilization system 10 of this embodiment includes a water storage tank 28 connected to the hot water supply pipe 14 on the downstream side of the hot water tap 16 and a portion where the water storage tank is connected to the hot water supply pipe. And an on-off valve 32 provided between the tap 26 and the faucet 26.

The water heater 12 is a first-stop type instantaneous water heater or the like, and is installed on an outdoor wall surface or an outdoor floor surface of a dwelling unit. The water heater 12 is a device for warming cold water introduced by using gas, kerosene, electricity or the like as an energy source, and one that is generally widely used is used.
A branch pipe 41 branched from the water main 18 is connected to the water heater 12, and cold water is introduced into the water heater 12 from here. The instant water heater as the water heater 12 automatically starts operation when cold water flows through the water heater 12 and automatically stops when cold water stops flowing.
The hot water heater 12 may be a hot water heater or the like as well as a first-stop type instantaneous water heater.

  The branch pipe 41 is connected to the cold water pipe 22, and a cold water faucet 24 is provided in the path of the cold water pipe 22 drawn into the indoor kitchen or bathroom, and the cold water faucet 24 is opened. Thus, cold water is supplied from the tip of the faucet 26.

  A hot water supply pipe 14 is connected to the water heater 12, and a hot water faucet 16 is provided in the path of the hot water supply pipe 14 drawn into the indoor kitchen or bathroom.

A water storage tank 28 for storing hot water waiting water is connected to the hot water supply pipe 14 between the hot water supply tap 16 and the tip of the faucet 26.
The water storage tank 28 is a resin tank having a capacity of about 3 liters, and a drain pipe 43 serving also as an air vent for discharging excess cold water when the water storage tank 28 is full is disposed near the upper surface thereof. The drain pipe is connected to a drain pipe 45.
The water storage tank 28 is disposed at a position where the bottom is lower than the connection with the hot water supply pipe 14, and the introduction and discharge of hot water waiting water is conducted through a first flexible pipe 47 a led from the top to the bottom of the water storage tank 28. (See FIG. 1 (a)). It is also possible to arrange the bottom of the water storage tank 28 at a position higher than the hot water supply pipe 14 and introduce / discharge hot water waiting water from the bottom (see FIG. 1B).

  The hot water supply pipe 14 at the site to which the water storage tank 28 (first flexible pipe 47a) is connected has a narrow-diameter portion 34a that narrows the flow path of the part, and the hot water flowing through the hot water supply pipe 14 is this The flow velocity is temporarily increased in the narrow diameter portion 34a, and the flow velocity is returned again to the original flow velocity downstream of the narrow diameter portion.

An opening / closing valve 32 is provided between the faucet 26 and a portion where the water storage tank 28 (first flexible pipe 47 a) is connected to the hot water supply pipe 14. The open / close valve 32 is a thermostat valve that opens when water in the hot water supply pipe 14 reaches a predetermined temperature (for example, about 42 ° C.).

  The cold water pipe 22 and the hot water supply pipe 14 are connected to each other at the faucet 26, and the cold water and the hot water are mixed as necessary and then flow out from the front end of the faucet 26.

Next, the flow of the operation of the hot water use system 10 of the present embodiment configured as described above will be described.
(1) When the hot water faucet 16 is opened, cold water is introduced from the water main 18 into the hot water heater 12 which is a first stop type instantaneous water heater, and the water heater 12 is automatically started to warm the introduced cold water. (A in FIG. 2).
(2) The hot water heated by the water heater 12 flows out from the water heater 12 to the hot water faucet 16 side and pushes out cold water in the hot water supply pipe 14 (A in FIG. 2).
(3) At this time, the on-off valve 32 which is a thermostat valve is closed, and the cold water is guided to the water storage tank 28 (B in FIG. 2).
(4) When the hot water reaches the on-off valve 32, the on-off valve 32, which is a thermostat valve, is opened due to its temperature rise, allowing the hot water to flow out to the faucet 26 (C in FIG. 2).
(5) When hot water flows out from the tip of the faucet 26, the cold water in the water storage tank 28 is sucked into the hot water supply pipe 14 little by little by the suction force of the hot water flowing through the narrow-diameter portion 34a and mixed with the hot water. 26 flows out from the tip (D in FIG. 2).
(6) If a large amount of cold water remains in the water storage tank 28 and hot water is guided to the water storage tank, the overflowing cold water is drained from the drain pipe 43 when the water storage tank is full. Drained into a pipe.

  In the hot water standby system 10 of the present embodiment described above, the cold water stored in the water storage tank using the ejector effect is mixed with hot water little by little and discharged, so that the hot water is simple and inexpensive. It can be used effectively using the system.

  The conceptual diagram for showing the structure of the hot water waiting water utilization system of Example 2 in FIG. 3 was shown. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in the figure, the hot water waiting water utilization system 20 of the present embodiment includes a water storage tank 28 connected to a hot water supply pipe 14 downstream of the hot water tap 16 and a cold water pipe 22 downstream of the cold water tap 24. The water storage tank 28 is composed of an open / close valve 32 provided between a portion where the hot water supply pipe 14 is connected to the faucet 26 and the like, and the water storage tank 28 is also connected to the cold water pipe 22. This is a very different point from Example 1.

  Further, the open / close valve 32 of the hot water use system 20 of the present embodiment uses an interlocking valve that opens when the amount of water stored in the water storage tank 28 reaches a certain level, instead of the thermostat valve of the first embodiment. Here, the amount of water stored in the water storage tank 28 where the interlocking valve is opened is about the same as the amount of cold water that has been drained wastefully until hot water is supplied from the faucet 26 until the hot water heater 12 is started. Amount. This amount varies depending on the length of the hot water supply pipe 14 from the water heater 12 to the faucet 26, but is generally about 1 to 3 liters.

  The water storage tank 28 of this embodiment is connected to the hot water supply pipe 14 downstream of the hot water tap 16 and the cold water pipe 22 downstream of the cold water tap 24, but the bottom of the water storage tank 28 is the hot water supply pipe. 14 is arranged at a position lower than the connecting portion with the water 14, and the hot water is introduced and discharged through the first flexible pipe 47a and the second flexible pipe 47b introduced from the top to the bottom of the water storage tank 28. (See FIG. 3 (a)). It is also possible to arrange the bottom of the water storage tank 28 at a position higher than the hot water supply pipe 14 and introduce / discharge hot water waiting water from the bottom (see FIG. 3B).

Unlike the first embodiment, a narrow-diameter portion is not formed in the connection portion between the hot water supply pipe 14 and the water storage tank 28 (first flexible tube 47a), and the first flexible tube 47a in the vicinity of the connection portion is not formed. A check valve 36 for preventing the cold water stored in the water storage tank 28 from flowing into the hot water supply pipe 14 is provided. On the other hand, the chilled water pipe 22 where the water storage tank 28 (first flexible pipe 47b) is connected is formed with a narrow-diameter portion 34b that narrows the flow path of the part, and the chilled water flowing in the chilled water pipe 22 is formed. Temporarily increases the flow velocity at the narrow-diameter portion 34b, and returns the flow velocity to the original flow velocity again downstream of the narrow-diameter portion 34b. The cold water in the water storage tank 28 is sucked into the cold water pipe 22 by the ejector effect and flows out by opening the cold water faucet 24 and flowing the cold water into the cold water pipe 22.
In addition, without providing the check valve 36 in the first flexible pipe, a narrow-diameter portion is also formed in the hot water supply pipe 14 at a site connected to the water storage tank 28 (first flexible pipe 47a) as in the first embodiment. The cold water in the water storage tank 28 can also be sucked into the hot water supply pipe 14.

Next, the operation of the hot water use system 20 of the present embodiment configured as described above will be described.
(1) When the hot water faucet 16 is opened, cold water is introduced from the water main 18 into the hot water heater 12 which is a first stop type instantaneous water heater, and the water heater 12 is automatically started to warm the introduced cold water. (A in FIG. 4).
(2) The hot water heated by the water heater 12 flows out from the water heater 12 to the hot water faucet 16 and pushes out the cold water in the hot water supply pipe 14 (A in FIG. 4).
(3) At this time, the on-off valve 32 which is an interlocking valve is closed, and cold water is guided to the water storage tank 28 (B in FIG. 4).
(4) When the amount of water stored in the water storage tank 28 becomes about 2/3, the on-off valve 32, which is an interlocking valve, is opened in conjunction with the amount of water stored in the water storage tank and allows hot water to flow out to the faucet 26 ( FIG. 4C). At this time, it is necessary for the on-off valve 32 to allow the hot water to flow into the faucet and to prevent the hot water from flowing into the water storage tank 28. For example, the first flexible pipe 47a has a relatively thin pipe. This can be dealt with by adopting the check valve 36 or closing the check valve 36 in conjunction with the opening operation of the on-off valve.
(5) On the other hand, when the chilled water faucet is opened in order to lower the hot water supply temperature or to use only chilled water, the chilled water in the water storage tank 28 is used for chilled water by the suction force of the chilled water flowing through the narrow diameter portion 34b A small amount is sucked into the pipe 22 and flows out from the tip of the faucet 26 (D in FIG. 4).
(6) If a large amount of cold water remains in the water storage tank 28 and hot water is guided to the water storage tank, the overflowing cold water is drained from the drain pipe 43 when the water storage tank is full. Drained into a pipe.

According to the hot water waiting water utilization system 20 of the present embodiment described above, the hot water waiting water can be effectively used by an inexpensive system having a simple structure as in the first embodiment, and the cold water faucet 24 is provided. Even when only the cold water is used by opening the plug, the cold water in the water storage tank 28 can be consumed. Thereby, the case where the water storage tank 28 is full and cold water must be drained from the drain pipe can be reduced.
Further, when the check valve 36 is provided in the first flexible pipe 47a, the cold water in the water storage tank 28 is not mixed into the hot water supply pipe 14, and a decrease in the hot water temperature due to the cold water mixture can be avoided.

  The main purpose of the present invention is to apply to home-use hot water supply equipment, but of course, the present invention is not limited to home use and can be widely applied to general hot water supply equipment. The present invention is not limited to the case where the water heater is a first-stop type instantaneous water heater, but can also be applied to a case where the water heater is a hot water storage type water heater. Furthermore, it is of course possible to use a manual valve that manually opens and closes the opening / closing valve instead of a thermostat valve or an interlocking valve.

It is a conceptual diagram for showing the structure of the hot water waiting-water utilization system of Example 1. It is the flow which showed the block diagram and operation | movement of the hot-water waiting-water utilization system of Example 1. FIG. It is a conceptual diagram for showing the structure of the hot water waiting water utilization system of Example 2. It is the flowchart which showed the block diagram of the hot water use system of Example 2, and its operation | movement. It is the conceptual diagram which showed the general structure of the conventional domestic hot water supply / water supply equipment. It is the conceptual diagram which showed the structure of the hot water waiting water collection | recovery system of patent document 1. FIG.

Explanation of symbols

12 Water Heater 14 Hot Water Supply Pipe 16 Hot Water Supply Faucet 18 Water Main Pipe 22 Cold Water Pipe 24 Cold Water Faucet 26 Faucet 28 Water Reservoir 32 Open / Close Valves 34a and 34b Narrow Diameter Part 36 Check Valve 41 Branch Pipe 43 Drain Pipe 45 Drain Pipe 47a First flexible pipe 47b Second flexible pipe 101 Water heater 102 Water main pipe 103a Hot water supply pipe 103b Cold water pipe 105 Faucet 107a Hot water faucet 107b Cold water faucet 108 Faucet branch pipe 109 Water recovery branch pipe 111 On-off valve 113 Recovery water storage tank

Claims (5)

A hot water supply pipe (14) piped from the water heater (12) and a hot water tap (16) for opening and closing the pipe, a cold water pipe (22) piped from the water main pipe (18) and a cold water for opening and closing the pipe A hot water waiting water utilization system applied to a hot water supply / water supply facility having a faucet (24), and a faucet (26) for mixing hot water and cold water through a hot water supply pipe and a cold water pipe,
A water storage tank (28) connected to a hot water supply pipe on the downstream side of the hot water faucet in order to store cold water that has passed through the hot water faucet at the time of startup of the water heater;
An open / close valve (32) provided between a portion where the water storage tank is connected to the hot water supply pipe and the faucet,
The hot water supply pipe is formed with a narrow diameter portion (34a) for narrowing the flow path in the vicinity of the portion to which the water storage tank is connected,
The hot water flowing in the hot water supply pipe increases the flow velocity in the narrow diameter portion, and sucks the cold water stored in the water storage tank into the hot water supply pipe by the ejector effect.
A hot water waiting water utilization system characterized by this. A hot water supply pipe (14) piped from the water heater (12) and a hot water tap (16) for opening and closing thereof, a cold water pipe (22) piped from the water main pipe (18), and cold water for opening and closing thereof A hot water waiting water utilization system applied to a hot water supply / water supply facility having a faucet (24) and a faucet (26) for mixing hot water and cold water through a hot water supply pipe and a cold water pipe,
A water storage tank (28) connected to a hot water supply pipe downstream of the hot water faucet and a cold water pipe downstream of the cold water faucet in order to store cold water that has passed through the hot water faucet when the water heater starts up;
An open / close valve (32) provided between a portion where the water storage tank is connected to the hot water supply pipe and the faucet,
The cold water pipe is formed with a narrow-diameter portion (34b) that narrows the flow path in the vicinity of the portion to which the water storage tank is connected,
The chilled water flowing in the chilled water pipe increases the flow velocity at the narrow diameter portion, and sucks the chilled water stored in the water storage tank into the chilled water pipe by the ejector effect.
A hot water waiting water utilization system characterized by this.   A check valve (36) is provided at a portion where the water storage tank (28) is connected to the hot water supply pipe (14) to prevent the cold water stored in the water storage tank from flowing into the hot water supply pipe. The hot water waiting water utilization system according to claim 2.   The hot water according to any one of claims 1 to 3, wherein the on-off valve (32) is a thermostat valve that is opened when water in the hot water supply pipe (14) reaches a predetermined temperature. Waiting water use system.   The hot water waiting water according to any one of claims 1 to 3, wherein the on-off valve (32) is an interlocking valve that opens in conjunction with the amount of water stored in the water storage tank (28). Usage system.