JPH08128731A - Water hammer preventing device of hot-water supply apparatus - Google Patents

Abstract

PURPOSE: To obtain a preventing device of water hammer phenomenon caused by on-off actions of a solenoid valve mounted on a bathtub hot-water automatic supply pipe of a hot-water supply apparatus where a general purpose hot-water supply pipe and the bathtub hot-water automatic supply pipe branch off from a hot-water supply pipe. CONSTITUTION: A supply hot-water flow control element 60 is provided at a diverging point and the position of a valve disc of the flow control element 60 is controlled by a controller 40 as follows: in operation wait state, it is controlled at an initial position where a general purpose hot-water supply pipe 15 and a bathtub hot-water automatic supply pipe 16 are opened full, during general purpose hot-water supply operation alone, at a position where the opening degree of the outlet of the general purpose hot-water supply pipe 15 is in vortex flow preventing state with the outlet of the bathtub hot-water automatic supply pipe 16 remaining in full open state, and during bathtub hot-water supply operation alone, at a position where the opening degree of the bathtub hot-water supply pipe 16 is in vortex flow preventing state with the outlet of the general purpose hot-water supply pipe 15 remaining in full open state, and during on-off action of a solenoid valve 18, at a position where the outlet of the bathtub hot-water supply pipe 16 is completely closed once.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water hammer phenomenon prevention device for a water heater, and more specifically, a water inlet pipe, a heat exchange can body for instantaneously heating water from the water inlet pipe, and a heat exchange can body from the heat exchange can body. It has a hot water supply pipe, a general hot water supply pipe branched from the hot water supply pipe, and a bath automatic drop hot water supply pipe. The general hot water supply operation is performed by opening and closing the hot water supply curran of the general hot water supply pipe, and the automatic bath automatic hot water supply operation is performed. The present invention relates to a water hammer phenomenon prevention device in a water heater, which is configured to automatically open and close a drop solenoid valve provided in the bath automatic drop hot water supply pipe.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional water heater. In FIG. 6, the water heater includes an instantaneous heat exchange can body 10 for hot water supply and a instantaneous heat exchange can body 50 for bath heating. A water inlet pipe 11 is connected to the instantaneous heat exchange can body 10 via a water flow rate sensor 21 and a water temperature sensor 22, and a hot water outlet pipe 12 is connected to the heat exchange can body 10. A bypass pipe 13 is branched from the water inlet pipe 11 and is joined to the hot water outlet pipe 12 via a bypass opening / closing valve 14 midway. General hot water supply pipe 15 and automatic bath hot water supply pipe downstream from this confluence
It branches into 16 and. 23 is a hot water supply temperature sensor, and 24 is an overflow prevention device. At the end of general hot water supply pipe 15
Is provided, and general hot water supply operation is performed by opening the hot water supply curran 17 by the user. A gas burner 10a is arranged in the instant heat exchange can body 10 for supplying hot water.
The overflow prevention device 24 plays a role of restricting an excessive flow rate so that the hot water discharged from the heat exchange can body 10 does not fall below at least the set temperature. The bath automatic drop hot water supply pipe 16 is connected to a bath reheating circulation path 52 via a drop solenoid valve 18 and a check valve 19. Reference numeral 25 is a drop flow sensor. A circulation path 52 consisting of a return pipe 52a and a forward pipe 52b is connected from the bathtub 51 to the instantaneous heat exchange can body 50 for reheating the bath, and the bath water is circulated to the can body 50 by a circulation pump 53. Be heated. The circulation path 52 is provided with a water flow switch 54, a bath temperature sensor 55, a bath water level sensor 56 and the like. A gas burner 50a is provided in the instant heat exchange can body 50 for reheating the bath.

[0003]

However, in the conventional water heater as described above, the bath automatic drop hot water supply pipe 16
Due to the nature of the solenoid valve 18, the drop automatic solenoid valve 18 instantaneously opens and closes the bath automatic drop hot water supply pipe 16, so that the bath automatic valve is automatically opened immediately after the drop solenoid valve 18 is opened and closed. There was a problem that a large noise was generated due to the water hammer phenomenon in the drop-in hot water supply pipe 16, the hot water supply pipe 12, the general hot water supply pipe 15, and the like. Further, in order to prevent this drawback, by using the overflow prevention device 24, by fully closing the overflow prevention device 24 when opening and closing the drop solenoid valve 18,
It is possible to prevent the water hammer phenomenon by eliminating the influence on the hot water supply pipe 12 side, but in this case as well, when the drop solenoid valve 18 is opened, it is a general hot water supply that communicates with the bath automatic drop hot water supply pipe 16. The water hammer phenomenon occurs because the pressure on the pipe 15 side suddenly decreases.

In view of the above, the present invention solves the above-mentioned drawbacks of the conventional device, and in a water heater provided with a bath automatic drop hot water supply pipe provided with a drop solenoid valve branched from a general hot water supply pipe, the opening / closing operation of the drop solenoid valve. An object of the present invention is to provide a water hammer phenomenon prevention device for a water heater that can prevent the water hammer phenomenon caused by the above.

[0005]

In order to achieve the above object, a water hammer phenomenon prevention device for a water heater according to the present invention comprises:
It has a water inlet pipe, a heat exchange canister for instantaneously heating the water from the water inlet pipe, a hot water outlet pipe from the heat exchanger canister, a general hot water supply pipe branched from the hot water outlet pipe, and a bath automatic drop hot water supply pipe. However, the general hot water supply operation is performed by opening and closing the hot water supply curran of the general hot water supply pipe, and the automatic bath drop hot water supply operation is performed by automatically opening and closing the drop solenoid valve provided in the automatic bath drop hot water supply pipe. A water-hammer phenomenon prevention device for a water heater with an automatic drop hot water supply function, wherein the opening degree of the outlet to the general hot water supply pipe side is at a branch point where the general hot water supply pipe and the bath automatic drop hot water supply pipe branch from the hot water supply pipe. And an automatic outflow controller for adjusting the opening degree of the outlet to the bath automatic hot water supply pipe by means of a valve element provided on one forward / backward axis. In addition, during operation standby in which neither automatic bath hot water supply operation is performed, the position of the valve body of the outflow controller is controlled to the origin position where both of the two outlets are fully opened, During the hot water supply independent operation, the valve position is automatically dropped into the bath to control the position of the outlet to the general hot water supply pipe to the overflow prevention state while the outlet to the hot water supply pipe is fully open. During the drop-in hot water supply independent operation, the position of the valve is controlled to a position where the opening of the outlet to the general hot water supply pipe is in the fully open state and the opening degree of the outlet to the hot water supply pipe is in the overflow prevention state. A controller is provided for controlling the position of the valve element when the solenoid valve for dropping the bath automatic hot water supply pipe is opened and closed so that the outlet to the bath automatic hot water supply pipe is fully closed.

[0006]

According to the above-mentioned features of the present invention, the position of the valve body of the outflow regulator is set by the controller during the operation standby state in which neither the general hot water supply operation nor the automatic bath hot water supply operation is performed. The outlet to the hot water supply pipe and the outlet to the bath automatic hot water supply pipe are both positioned at fixed positions where they are fully opened. The position of the valve element during this operation stop is the origin position, and the valve element is controlled to move from the origin position during operation. That is, when the general hot water supply operation is performed independently, the controller controls the position of the valve of the outflow amount controller to the outlet for the general hot water supply pipe with the outlet for the automatic bath drop hot water supply pipe being fully opened. The opening degree of is controlled to a position where it is in the overflow prevention state. When the bath automatic drop-in hot water supply operation is performed independently, the controller controls the valve position of the outflow controller so that the outlet to the general hot water supply pipe is fully open and the bath automatic drop-in hot water supply pipe flows. The opening degree of the outlet is controlled to a position where the overflow prevention state is set. Due to the above, during the general hot water supply operation,
Also, the function of preventing the hot water from overflowing during the automatic bath hot water supply operation is fulfilled. On the other hand, when the drop solenoid valve provided in the bath automatic drop hot water supply pipe is opened / closed, the position of the valve element of the outflow amount controller is once set by the controller so that the outlet to the bath automatic drop hot water supply pipe is It is controlled to the fully closed position. As a result, the hot water supply pipe and the general hot water supply pipe are blocked from the automatic bath drop water supply pipe, so that even if the drop solenoid valve is opened and closed, no sudden pressure fluctuations occur in each pipe, and therefore the water hammer phenomenon occurs. Is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is an overall configuration diagram of a water heater provided with the apparatus of the present invention, FIG.
~ Fig. 4 is a vertical cross-sectional view of the outflow rate regulator, Fig. 2 shows the state of the outflow rate regulator while the operation is on standby, and Fig. 3 is the outflow rate during the general hot water supply independent operation and the bath automatic drop hot water supply independent operation. FIG. 4 shows the state of the regulator, and FIG. 4 shows the state of the outflow regulator during the opening / closing operation of the drop solenoid valve. Figure 5
6 is a flow chart showing an example of control of an outflow controller by a controller.

First, the water heater shown in FIG. 1 will be described. The water heater has an instantaneous heat exchange can body 10 for hot water supply, and a momentary heat exchange can body 50 for bath reheating. A water inlet pipe 11 is connected to the instantaneous heat exchange can body 10 via a water flow rate sensor 21 and a water temperature sensor 22, and a hot water outlet pipe 12 is connected to the heat exchange can body 10. A bypass pipe 13 is branched from the water inlet pipe 11 and is joined to the hot water outlet pipe 12 via a bypass opening / closing valve 14 midway. A general hot water supply pipe 15 and a bath automatic drop hot water supply pipe 16 are branched downstream from this confluence. 23 is a hot water supply temperature sensor. A hot water supply calan 17 is provided at the end of the general hot water supply pipe 15, and the general hot water supply operation is performed by the hot water supply calan 17 being opened by the user.
A gas burner 10 is provided in the instant heat exchange can body 10 for hot water supply.
a is provided. Bath automatic drop hot water supply pipe 16
Is connected to a bath reheating circulation path 52 via a drop solenoid valve 18 and a check valve 19. Reference numeral 25 is a drop flow sensor. Instantaneous heat exchange can body for reheating the bath
A circulation path 52 composed of a return pipe 52a and an outflow pipe 52b is connected to the bath 50 from the bathtub 51, and the bath water is circulated in the can body 50 and heated by the circulation pump 53. The circulation path 52 is provided with a water flow switch 54, a bath temperature sensor 55, a bath water level sensor 56 and the like. A gas burner 50a is provided in the instant heat exchange can body 50 for reheating the bath. The above configuration is shown in FIG.
It is the same as the conventional water heater shown in.

According to the present invention, the conventional overflow prevention device 24
Instead of providing the above-mentioned hot water supply pipe 12, the outflow amount controller 60 is provided with a general hot water supply pipe 15 and a bath automatic drop water supply pipe 16 from the hot water discharge pipe 12.
It is provided at the branch point where and branch. Then, the outflow controller 60 is controlled by the controller 40 according to its operating condition. The controller 40 is based on a command from a remote controller (not shown), and based on information from each sensor of the water heater, based on predetermined calculation and judgment, the outflow amount controller.
In addition to 60, it issues control commands to each part of the water heater.

The structure of the outflow amount adjuster 60 will be described with reference to FIG. The tubular case 60a is provided with a connection port 61 for the hot water supply pipe 12, a connection port 62 for the general hot water supply pipe 15, and a connection port 63 for the bath automatic drop hot water supply pipe 16.
The water that has entered the case 60a flows out from the connection port 62 to the general hot water supply pipe 15 through the general hot water supply side outlet 64, and also through the automatic bath drop hot water supply side outlet 65 to the bath automatic from the connection port 63. Drop into the hot water supply pipe 16. One advancing / retreating shaft 66 is movably arranged on the central axis of the case 60a, and a valve element 67 is provided on the advancing / retreating shaft 66.
The advancing / retreating shaft 66 is configured to advance / retreat by a predetermined amount when a motor such as a stepping motor (not shown) is rotated by a predetermined amount by the controller 40. The valve body 67 has a pair of valves including a general hot water supply side valve 67a and a bath automatic drop hot water supply side valve 67b, and the opening degree of the general hot water supply side outlet 64 is adjusted and controlled by the general hot water supply side valve 67a. The opening degree of the bath automatic drop-in hot water supply side outlet 65 is adjusted and controlled by the automatic drop-in hot water supply side valve 67b. Both valves 67a and 67b naturally move in the same direction by the same distance as the advancing / retreating shaft 66 moves back and forth, but when the valve 67a increases the opening degree of the outlet 64, the valve 67b decreases the opening degree of the outlet 65, Both valves 67a and 67b are arranged so that when valve 67a reduces the opening of outlet 64, valve 67b increases the opening of outlet 65.
The directions of aperture adjustment by a and 67b are reversed.

Next, the outflow controller 60 by the controller 40
2 will be described with reference to FIGS. 2 to 4 and 5.
FIG. 2 shows a standby state in which neither the automatic bath hot water supply operation nor the general hot water supply operation is performed, and the positions of the valves 67a and 67b of the valve body 67 provided on the advancing / retreating shaft 66 are the general hot water supply side outlets 6
4. Each of the bath automatic drop-in hot water supply side outlets 65 is in a position to be fully opened. That is, in FIG. 5, the automatic bath drop hot water supply operation is not performed (S
If No in 1) and the general hot water supply operation is not performed (No in S2), the valves 67a and 67b of the valve body 67 are positioned so that their outlets 64 and 65 are fully opened. (S3). With the position in this operation standby state as the origin position, the controller 40 moves forward and backward according to the operation state.
66 is moved back and forth, and the position of the valve body 67 is controlled.

The state of the outflow controller 60 shown in FIG. 3 shows both the case of the general hot water supply independent operation and the case of the automatic bath drop hot water supply independent operation. That is, the position of the valve body 67 shown below the central axis of the outflow rate regulator 60 shown in FIG. 3 indicates a case where the general hot water supply alone operation is performed, and the valve body 67 shown above the central axis is shown. The position of indicates the case where the bath is automatically dropped and the hot water is operated independently. In the case of the general hot water supply independent operation (No in S1 in FIG. 5, Yes in S2), as shown in the position of the valve body 67 shown below the central axis in FIG. While maintaining the position of the side valve 67b at the position where the bath automatic drop-in hot water supply side outlet 65 is still fully open, the position of the general hot water supply side valve 67a becomes the overflow prevention state of the general hot water supply side outlet 64. The position is controlled (S4). That is, the controller 40
To prevent the hot water temperature for the general hot water supply passing through the hot water supply temperature sensor 23 from becoming lower than the set hot water supply temperature, the position of the valve body 67 is directed from the origin position in the direction to eliminate the excessive flow rate of the general hot water supply (to the right in the figure). Then, the opening degree of the general hot water supply side outlet 64 is reduced by moving it appropriately as necessary. Of course, in this case, the valve 67b tends to further increase the opening degree of the outflow port 65, but it does not change to the fully open state. Next, when the bath automatic drop-in hot water supply operation is in progress (YES in S1 in FIG. 5, No in S5), the valve body 67 shown above the central axis in FIG.
As shown in the position of, the controller 40 keeps the position of the general hot water supply side valve 67a at a position where the outlet 64 of the general hot water supply side valve 67a continues to be fully opened, and the automatic bath drop hot water supply side valve 67b.
Is controlled to a position where the opening degree of the outflow port 65 is in the overflow prevention state (S6). That is, the controller 40 eliminates the excessive flow rate of the hot water supply by automatically dropping the bath from the origin position so that the hot water temperature for automatically dropping hot water through the hot water temperature sensor 23 does not fall below the set hot water supply temperature. The opening degree of the bath automatic drop-in side hot water supply side outflow port 65 is reduced by moving the bath as appropriate in the direction (left direction in the drawing). Of course, in this case, the valve 67a tends to further increase the opening degree of the outlet 64, but it does not change to the fully open state.

Next, when both the automatic bath hot water supply operation and the general hot water supply operation are performed (S in FIG. 5)
(Yes in 1 and Yes in S5), the controller 40 prioritizes the adjustment of the opening degree of the general hot water supply side outlet 64 by the general hot water supply side valve 67a in order to secure the flow rate and temperature of the general hot water supply side. . Therefore, in this case, the opening degree of the outflow port 65 is adjusted by the automatic bath hot water supply side valve 67b (S7).

Next, the control of the outflow controller 60 by the controller 40 when the drop solenoid valve 18 of the bath automatic drop hot water supply pipe 16 is opened and closed will be described. By opening and closing the drop solenoid valve 18, the passage of the bath automatic drop hot water supply pipe 16 is suddenly opened or closed, which causes a water hammer phenomenon.
Now, while in operation standby or general hot water supply independent operation,
When the controller 40 opens the drop solenoid valve 18 based on a start command for the automatic bath drop hot water supply operation from a remote controller (not shown) (Yes in S8), the controller 40 first outputs the outflow amount as shown in FIG. After adjusting the controller 60, the bath automatically drops and the hot water supply side valve 67b is the outlet.
65 is controlled to be fully closed, followed by a solenoid valve
18 is opened (S9). Once the bath automatic drop hot water supply side outlet 65 is fully closed, the effect of the opening operation of the solenoid valve 18 does not propagate from the bath automatic drop hot water supply pipe 16 side to the hot water supply pipe 12 or the general hot water supply pipe 15 and a loud noise is generated. It does not develop into a water hammer phenomenon in which there is a problem. On the other hand, when the controller 40 closes the drop solenoid valve 18 based on the set drop flow rate information from the drop flow rate sensor 25 during the automatic bath drop hot water supply independent operation or the simultaneous operation of the bath automatic drop hot water supply and the general hot water supply at the same time. (Yes at S10) In this case, the controller 40
As shown in FIG. 4, first, the outflow controller 60 is controlled so that the bath automatic drop-in hot water supply side valve 67b controls the outflow port 65 to a fully closed state, and then the closing operation of the solenoid valve 18 is performed. (S11). As a result, the effect of the closing operation of the solenoid valve 18 is affected by the automatic bath drop from the hot water supply pipe 16 side to the hot water discharge pipe 12
And does not propagate to the general hot water supply pipe 15, and does not develop into a water hammer phenomenon in which a loud noise is produced.

[0015]

According to the present invention, there is provided the above construction.
According to the water hammer phenomenon prevention device for the water heater described in (1), the outflow controller is arranged at the branch point where the hot water supply pipe and the bath automatic drop water supply pipe branch from the hot water supply pipe, and the controller automatically controls the bath automatic drop water supply pipe. When the drop solenoid valve is opened and closed, the bath automatic drop hot water supply pipe side outlet is once fully closed.Therefore, even if the drop solenoid valve is opened and closed, sudden pressure fluctuations may occur. It does not occur in the pipe, and the water hammer phenomenon can be prevented. Further, during the operation such as the general hot water supply operation and the bath automatic drop hot water supply operation, by controlling the outflow amount controller with the controller, it is possible to prevent the general hot water supply and the bath automatic drop hot water supply from overflowing together.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a water heater provided with the apparatus of the present invention.

FIG. 2 is a vertical cross-sectional view of the outflow rate adjuster showing a state of the outflow rate adjuster during standby for operation.

FIG. 3 is a vertical cross-sectional view of the outflow rate adjuster showing the states of the outflow rate adjuster during the general hot water supply independent operation and the bath automatic drop hot water supply independent operation.

FIG. 4 is a vertical cross-sectional view of the outflow amount controller showing a state of the outflow amount controller when the drop solenoid valve is opened and closed.

FIG. 5 is a flowchart showing an example of control of an outflow amount adjuster by a controller.

FIG. 6 is an overall configuration diagram of a conventional water heater.

[Explanation of symbols]

 10 Instantaneous heat exchange canister 11 Water inlet pipe 12 Hot water outlet pipe 15 General hot water supply pipe 16 Bath automatic drop-in hot water supply pipe 17 Hot water supply currant 18 Drop-in solenoid valve 40 Controller 60 Outflow controller 64 General hot water supply side outlet 65 Bath automatic drop water supply side flow Outlet 66 Forward / backward shaft 67 Valve body 67a General hot water supply side valve 67b Automatic bath drop hot water supply side valve

Claims (1)

[Claims] 1. A water inlet pipe, a heat exchange canister for instantaneously heating water from the water inlet pipe, a hot water outlet pipe from the heat exchange canister, a general hot water supply pipe branched from the hot water outlet pipe, and a bath automatic drop. It has a hot water supply pipe, the general hot water supply operation is by opening and closing the hot water supply curran of the general hot water supply pipe, and the bath automatic drop hot water supply operation is by automatically opening and closing the drop solenoid valve provided in the bath automatic drop hot water supply pipe. A water hammer phenomenon prevention device for a water heater with a bath automatic drop hot water supply function, which is provided to the general hot water supply pipe side at a branch point where the general hot water supply pipe and the bath automatic drop hot water supply pipe branch from the hot water supply pipe. An outflow rate adjuster is arranged so that the opening degree of the outlet and the opening degree of the outlet to the bath automatic hot water supply pipe can be adjusted at the same time by a valve element provided on one advancing / retreating axis, and In the standby state where neither the general hot water supply operation nor the automatic bath hot water supply operation is performed, the position of the valve body of the outflow controller is set to the origin position where both of the two outlets are fully opened. Controls the position of the valve element while the general hot water supply is operating independently so that the opening of the outlet to the general hot water supply pipe is in the overflow prevention state while the bath automatic drop is in the fully open state. However, while the bath automatic drop hot water supply alone is in operation, the valve body is moved to a position where the outlet to the general hot water supply pipe is fully open and the opening of the outlet to the hot water supply pipe is in the overflow prevention state. A controller is provided to control the position of the valve body when the solenoid valve for dropping the bath automatic drop-in hot water supply pipe is opened / closed, and once the outlet to the bath automatic drop-in hot water supply pipe is fully closed. Characteristic Water heater water hammer phenomenon prevention device for.