JPH06313624A - Water hammering preventing device for hot water feeder - Google Patents

Abstract

PURPOSE:To provide a water hammering preventing device for a hot water feeder in which no water hammering phenomenon may be produced within each of pipes of the hot water feeder when a hot water feeding is started or stopped. CONSTITUTION:There is provided a water hammering preventing device for a hot water feeder in which hot water fed from a water feeding pipe 10 into a hot water feeding-out pipe 30 through a hot water feeding heat exchanger 20 is generally fed through a general hot water feeding pipe 50 and at the same time the hot water can be fed to a bath tub through a bath tub hot water feeding pipe 60. The hot water feeding pipe 30, the general hot water feeding pipe 50 and the bath tub hot water feeding pipe 60 are connected from each other in such a manner that they may be freely connected or disconnected through a three-way valve 90 and there is also provided a controller 100 constructed to operate in such a manner that each of the passages for the hot water feeding-out pipe 30 and the general hot water feeding pipe 50 against the bath tub hot water feeding pipe 60 is shut off at first by the three-way valve 90, the hot water feeding valve 61 in the bath tub hot water feeding pipe 60 is released and then each of passages for the hot water feeding-out pipe 30 and the general hot water feeding pipe 50 against the bath tub hot water feeding pipe 60 is communicated from each other through the three-way valve 90.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can supply hot water from a water inlet pipe to a hot water outlet pipe through a hot water supply heat exchanger to a hot water supply pipe through a general hot water supply pipe as well as a bathtub hot water supply via a bathtub hot water supply pipe. In such a water heater, the present invention relates to a device for preventing a water hammer generated in a pipe when hot water supply is started or stopped.

[0002]

2. Description of the Related Art FIG. 7 shows a configuration of a conventional water heater capable of supplying general hot water and hot water to a bathtub. The water that has entered the hot water supply heat exchanger 20 from the water inlet pipe 10 is heated there and is discharged to the hot water outlet pipe 30. An overflow prevention valve for preventing the temperature from increasing due to an excessive flow rate in the hot water discharge pipe 30
40 are provided. General hot water supply pipe 50 from the hot water supply pipe 30
The bathtub automatic hot water supply pipe 60 is branched, and the general hot water supply pipe 50 is provided with a general hot water supply calan 51. An electromagnetic hot water supply valve 61 is provided in the middle of the bathtub automatic hot water supply pipe 60 and is connected to the bath reheating circulation path 70. 80 is a bathtub. At the time of hot water supply in the bathtub, the electromagnetic hot water supply valve 61 is opened so that the hot water discharged from the water supply pipe 10 to the hot water supply heat exchanger 20 to the hot water supply pipe 30 further passes through the bathtub automatic hot water supply pipe 60. It enters the bath reheating circuit 70 and is introduced into the bath 80. In addition, by opening the general hot water supply system 51, hot water is supplied from the hot water supply pipe 30 through the general hot water supply pipe 50.

[0003]

In the above-mentioned conventional example, when the electromagnetic hot water supply valve 61 of the bathtub automatic hot water supply pipe 60 is opened and closed, the overflow prevention valve of the hot water discharge pipe 30 is previously set.
It is designed such that opening and closing operations are performed after 40 is closed, and this causes the passage of the piping upstream of the overflow prevention valve 40 to be blocked, causing the phenomenon of water hammer. It was supposed to not. On the other hand, however, no means is provided on the side of the general hot water supply pipe 50, and therefore, when the inside of the general hot water supply pipe 50 is in a high water pressure state (the state in which the general hot water supply scalding is closed), the electromagnetic hot water supply valve When 61 is opened, as shown in FIG. 8, the pressure in the general hot water supply pipe 50 suddenly changes from high water pressure to zero until it reaches the end, which causes a water hammer phenomenon in the pipe.

Therefore, the present invention solves the drawback of the water hammer phenomenon in the conventional water heater described above, and prevents the water hammer from occurring in each pipe of the water heater when starting or stopping the water heater. For the purpose of providing.

[0005]

In order to achieve the above-mentioned object, the apparatus of the present invention uses the general hot water supply pipe to supply hot water from the water supply pipe to the hot water supply pipe through the hot water supply heat exchanger and the hot water supply to the bathtub. A water hammer prevention device for a water heater capable of supplying hot water to a bathtub through a pipe, wherein the hot water discharge pipe, the general hot water supply pipe, and the hot water supply pipe are connected to each other by a three-way valve in a freely connectable and disconnectable manner. At the same time, the three-way valve is first closed by the start command of the bathtub hot water supply to block the passages of the hot water supply pipe and the general hot water supply pipe with respect to the bathtub hot water supply pipe, then the hot water supply valve of the bathtub hot water supply pipe is opened, and then the three-way valve is opened. The first feature is that a controller having a control structure for gradually communicating the passages of the hot water supply pipe and the general hot water supply pipe with respect to the bathtub hot water supply pipe is provided. The device of the present invention is the first
In addition to the above feature, the second feature is that the three-way valve has both the overflow prevention function in the general hot water supply pipe and the overflow prevention function in the bathtub hot water supply pipe.

[0006]

According to the first feature described above, when hot water supply is performed in the bathtub, the three-way valve is operated by the controller before the hot water supply valve of the hot water supply pipe for the bathtub is opened, and the hot water supply pipe for the hot water supply pipe for the bathtub hot water supply pipe is opened. Since each passage of the general hot water supply pipe is once shut off and the hot water supply valve of the bathtub hot water supply pipe is opened, the passages of the hot water discharge pipe and the general hot water supply pipe with respect to the bathtub hot water supply pipe are made to gradually communicate with each other. Even if bathtub hot water supply is started when the inside of the hot water supply pipe and the inside of the general hot water supply pipe are both in a high water pressure state, the water pressure inside the hot water discharge pipe or the general hot water supply pipe will suddenly drop from high water pressure to zero by opening the hot water supply valve of the bathtub hot water supply pipe. It is prevented that the water pressure is reduced, so that the water hammer phenomenon is prevented from occurring not only on the hot water supply pipe side but also on the general hot water supply pipe side. Further, according to the second feature, the three-way valve used for preventing the water hammer phenomenon can prevent overflow during general hot water supply and overflow during bath water supply. Therefore, it is very convenient.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram showing an embodiment of the device of the present invention, FIG. 2 is a detailed view of a three-way valve showing a state where a passage is fully closed, and FIG. 3 is a three-way valve for preventing overflow of a general hot water supply pipe. Detailed drawing of Figure 4,
Is a detailed view of the three-way valve that prevents overflow of the bathtub hot water supply pipe, FIG. 5 is a detailed view of the three-way valve showing the state where the passage is fully opened, and FIG. 6 is a view when the hot water supply valve of the bathtub hot water supply pipe is opened. It is a figure which shows the water pressure change of the general hot water supply pipe and the hot water supply pipe side.

The water inlet pipe 10 is connected to the hot water supply heat exchanger 20,
A hot water supply pipe 30 is connected to the hot water supply heat exchanger 20. Tap pipe
A general hot water supply pipe 50 and a bathtub automatic hot water supply pipe 60 are branched from 30, and the respective pipes 30, 50, 60 are connected by a three-way valve 90 so as to be freely connected and disconnected. The general hot water supply pipe 50 is provided with a general hot water supply runner 51, and the bathtub automatic hot water supply pipe 60 is provided with an electromagnetic hot water supply valve 61 in the middle thereof. The bathtub automatic hot water supply pipe 60 is connected to the bath reheating circulation path 70, and the reheating circulation path 70 is connected to the bathtub 80. 100 is a controller that controls each part of the water heater. 11 is a check valve, 12 is a water amount sensor, 62 is a water amount sensor, 63 is a check valve, 71 is a circulation pump, 72
Is a water flow switch and 73 is a heat exchanger for reheating.

As shown in FIGS. 2 to 5, the three-way valve 90 has a hot water outlet pipe connection port A at the front of a cylindrical case 91, a general hot water supply pipe connection port B at the center, and a bathtub automatic hot water supply at the rear part. Pipe connection port C
Are provided respectively. Further, a valve body 93 which is moved forward and backward by an electric motor 92 is provided in the cylindrical case 91, and the valve body 93 is provided with a first valve portion 93b at a front portion thereof and a second valve portion 93c at a rear portion thereof. Has been. And the valve part 93b before and after this
, 93c corresponding to the inner wall of the cylindrical case 91.
A valve seat portion 94b and a second valve seat portion 94c.
In the above structure, the three-way valve 90 can open and close the passage in the following four states. First, as shown in FIG. 2, the valve portions 93b and 93c are in full contact with the valve seat portions 94b and 94c, respectively, so that the connection ports A, B and C are completely closed from each other. Also, from the fully closed state to the valve body
At the position where 93 is properly retracted, as shown in FIG.
The valve portion 93b and the valve seat portion 94b form a small gap, and the valve portion 93b
The hot water from the hot water outlet pipe 30 flows from the connection port A through the connection port B to the general hot water supply pipe 50 in a state in which the flow rate is appropriately restricted by continuously contacting c and the valve seat portion 94c. The state where it is made possible, that is, the overflow prevention state in the general hot water supply pipe 50. Further, at a position where the valve body 93 is further retracted, as shown in FIG. 4, the valve portion 93b and the valve seat portion 94 are
b is sufficiently opened, and a small gap is formed between the valve portion 93c and the valve seat portion 94c, so that hot water from the hot water outlet pipe 30 can be connected to the connection port A.
From the connection port B to the general hot water supply pipe 50 at a free flow rate, while the hot water flowing from the connection port A to the bathtub automatic hot water supply pipe 60 through the connection port C is appropriately throttled. State, that is, overflow prevention state in the bathtub automatic hot water supply pipe 60.
Further, at the position where the valve body 93 is further retracted, as shown in FIG. 5, the valve portions 93b and 93c are respectively moved to the valve seat portions 94b and 94c.
The hot water from the hot water outlet pipe 30 flows freely from the connection port A through the connection port B and the connection port C to the general hot water supply pipe 50 and the bathtub automatic hot water supply pipe 60, respectively, by being fully opened. Fully open state that can be. It should be noted that the overflow prevention state is a state in which the flow rate of a certain amount or more does not flow in relation to the heating capacity of the heat exchanger so that the temperature of the hot water supplied is not lowered.

A control configuration of the three-way valve 90 of the controller 100 will be described. The controller 100 normally keeps the three-way valve 90 fully open (FIG. 5). In this state, when the hot water supply device 51 or the like is opened, general hot water is supplied. At this time, if the flow rate of the general hot water supply is excessive, the valve body 93 of the three-way valve 90 is moved to the position shown in FIG. 3 to bring the flow rate of the general hot water supply pipe 50 into the overflow prevention state. When automatic hot water supply to the bathtub is instructed by a remote controller (not shown) or the like, the controller 100 first drives the electric motor 92 of the three-way valve 90 to move the valve element 93 to the frontmost position, and the fully closed valve shown in FIG. State. Next, the electromagnetic hot water supply valve 61 of the bathtub automatic hot water supply pipe 60 is opened. Then, next, the electric motor 92 is driven to move the valve element 93 to the rearmost position and return to the state of FIG. In this case, the electric motor 92 causes the valve body 93 to gradually return to the state shown in FIG.
And the general hot water supply pipe 50 and the hot water discharge pipe 30 gradually communicate with each other, and as shown in FIG. 6, the water pressure in each pipe 30, 50 gradually decreases,
A sudden drop in water pressure in the general hot water supply pipe 50 and the hot water supply pipe 30 is prevented. That is, it is possible to prevent the occurrence of the water hammer phenomenon in the general hot water supply pipe 50 and the hot water supply pipe 30. When the flow rate of the automatic bathtub hot water supply pipe 60 becomes excessive during the automatic hot water supply to the bathtub, the controller 100 operates the valve body of the three-way valve 90.
93 is moved to the position of FIG. 4, and the flow rate of the bathtub automatic hot water supply pipe 60 is set to the overflow prevention state. In this case, the general hot water supply pipe 50
Since the passage to is still open, general hot water supply can be performed by opening the general hot water supply calan 51. When general hot water supply is started during automatic hot water supply to the bathtub 80,
The two flow rate sensors 12, 62 can easily detect the use of the other plug.

[0011]

According to the present invention, which has the above-described structure,
According to the water hammer prevention device for a water heater described in (1), the hot water discharge pipe, the general hot water supply pipe, and the bathtub hot water supply pipe are connected to each other by a three-way valve so that they can be connected to and disconnected from each other first, and the first command is issued by the start command of the hot water bath. A three-way valve is used to block each passage of the hot water supply pipe for the bathtub hot water supply pipe and the general hot water supply pipe, the hot water supply valve of the bathtub hot water supply pipe is then opened, and then a three-way valve is used for the hot water supply pipe for the bathtub hot water supply pipe. Since a controller with a control configuration that gradually connects the passages of the general hot water supply pipe is provided, even if the hot water supply pipe or the general hot water supply pipe is in a high water pressure state, even if the hot water supply pipe starts, It is possible to prevent the water pressure in the general hot water supply pipe from dropping from high water pressure to zero water pressure at once, which prevents the occurrence of the water hammer phenomenon not only on the hot water supply pipe side but also on the general hot water supply pipe side. That. According to the water hammer prevention device for a water heater according to claim 2, in addition to the effect of the configuration according to claim 1, the three-way valve has the overflow prevention function in the general hot water supply pipe and the overflow in the bathtub hot water supply pipe. Since it also has a prevention function, one three-way valve can prevent not only the water hammer phenomenon but also the overflow prevention in each hot water supply.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a device of the present invention.

FIG. 2 is a detailed view of the three-way valve showing a state where the passage is fully closed.

FIG. 3 is a detailed view of a three-way valve that prevents overflow of a general hot water supply pipe.

FIG. 4 is a detailed view of a three-way valve that prevents overflow of the bathtub hot water supply pipe.

FIG. 5 is a detailed view of the three-way valve showing a state where the passage is fully opened.

FIG. 6 is a general hot water supply pipe when the hot water supply valve of the bathtub hot water supply pipe is opened,
It is a figure which shows the water pressure change on the tapping pipe side.

FIG. 7 is a configuration diagram of a conventional water heater capable of supplying general hot water and hot water to a bathtub.

FIG. 8 is a diagram showing changes in water pressure on the general hot water supply pipe and the hot water discharge pipe side when the hot water supply valve of the bathtub hot water supply pipe is opened in the conventional hot water supply device.

[Explanation of symbols]

 10 Water inlet pipe 20 Heat exchanger for hot water supply 30 Hot water outlet pipe 50 General hot water supply pipe 60 Bath automatic hot water supply pipe 61 Electromagnetic hot water valve 80 Bathtub 90 Three-way valve 100 Controller

Claims (2)

[Claims] 1. A water heater in which hot water discharged from a water inlet pipe through a hot water heat exchanger to a hot water outlet pipe can be supplied to the hot water supply pipe through the general hot water supply pipe and also through the bathtub hot water supply pipe to supply hot water to the bathtub. A water hammer prevention device,
The hot water supply pipe, the general hot water supply pipe, and the bathtub hot water supply pipe are connected to each other by a three-way valve so that they can be connected to and disconnected from each other at the same time. A control structure in which each passage of the general hot water supply pipe is shut off, then the hot water supply valve of the bathtub hot water supply pipe is opened, and then the three-way valve is opened to gradually connect the passage of the hot water supply pipe to the bathtub hot water supply pipe and the respective passages of the general hot water supply pipe A water hammer prevention device for a water heater, characterized by being provided with the controller. 2. The water hammer prevention device for a water heater according to claim 1, wherein the three-way valve has both an overflow prevention function in the general hot water supply pipe and an overflow prevention function in the bathtub hot water supply pipe.