JPH06241566A - Hot water supply apparatus - Google Patents

Abstract

PURPOSE:To take out high pressure hot water with high convenience from a hot water supply cock keeping safe pressure in a water heater in a hot water supply apparatus wherein water fed from a hot water supply piping is heated by the water heater and is supplied to the hot water supply cock through the hot water supply piping. CONSTITUTION:A hot water supply apparatus is adapted such that there are provided and connected a low pressure bypass valve (1v) where set pressure is set to be low and a high pressure bypass valve (hV) set to be high pressure to a water heater (a), and the low pressure bypass valve (1v) is interrupted from the water heater (a) by making use of hot water on the side of a hot water supply piping 3 connected with a hot water supply port 12 of the water heater (a) and of a flow produced in the hot water supply piping 3 or a hot water supply piping 2, and that water is supplied to the water heater (a) at high water supply pressure in the course of the use of the hot water on the side of the hot water supply piping 3 while the water supply is interrupted upon the use of the hot water being interrupted. In this hot water supply apparatus, a check valve(cv) is provided on the side of the hot water supply port 12 to which the hot water supply piping :3 of the water heater (a) is connected. A pressure switch P.S is provided downstream of the check valve(cv) and is electrically parallely connected with a flow sensor FL.S provided on the water supply piping or the hot water supply piping such that a solenoid valve SV1 provided on the water supply piping 2 is opened and closed by the flow of the water or the hot water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a water heater such as a boiler using a burner or a heater or a water heater such as a water heater utilizing solar heat to feed water introduced from a water supply pipe to a hot water tap. Among hot water heaters, in order to keep the pressure inside the can of the water heater safe and to take out high-pressure hot water that is easy to use from the hot water tap, when the hot water tap is closed and hot water is stopped, the water heater The present invention relates to an improvement in a hot water supply device in which water supply to the water supply is stopped.

[0002]

2. Description of the Related Art The hot water supply apparatus of the above-mentioned form was developed by the applicant of the present invention.
Specifically, a description will be given of the one in the form of an ordinary boiler in which the can body 1 is assembled, and as shown in FIG. 1, a hot water in the form of an ordinary boiler in which the burner device 10 and the can body 1 are combined. The water supply pipe 11 is connected to the water heater 11 of the water heater a.
And the hot water supply pipe 12 to the hot water supply port 12,
The can 1 of the water heater a has a first escape port 1 provided in it.
3 is connected to a high pressure relief valve hv, a second relief port 14 is connected to a low pressure relief valve lv, and the water supply pipe 2 connected to the water supply port 11 detects a pressure change in the can body 1. Is operated by the pressure sensor (or pressure switch) P / S, the flow switch (or flow sensor) FL / S that operates by sensing the presence or absence of the flow in the water supply pipe 2, and the water supply pipe 2. A pressure reducing valve V for reducing the pressure of the incoming water to a predetermined water pressure and a solenoid valve SV1 for shutting off the water supply pipe 2 from the primary side are connected in series in the above order from the water supply port 11 side toward the upstream side (primary side). The solenoid valve SV1 is of a normally closed type in which the solenoid valve SV1 is opened by a control operation by the pressure switch P.S detecting the pressure drop in the can body 1 and operating. Along with the flow switch FL As the S continues to hold the valve open state in operation to detect the flow, the control circuit w the pressure switch P
・ S and flow switch FL ・ S are electrically connected in parallel.

Between the low-pressure relief valve lv connected to the second relief port 14 and the second relief port 14, the flow switch FL.S is normally open to close the valve, thereby closing the valve. Connect the solenoid valve SV2 controlled to
The hot water supply pipe 3 is connected to a hot water supply tap 30 on the downstream side, an air vent valve 31 is connected to the base end side, and the high pressure relief valve hv provided at the first relief port 13 of the water heater a is its set pressure, the intermediate pressure between 1 kgf / cm ^2, which is a standard pressure for 3 kgf / cm ² and normal safety standards pressure of the pressure structure of the water heater a 1.9kgf / cm ² Yes set to the low-pressure relief valve lv provided in the second relief port 14, its set pressure, is set somewhat lower than 0.95kgf / cm ² and 1 kgf / cm ^2. Further, the pressure reducing valve V provided in the water supply pipe 2 connected to the water supply port 11 of the water heater a has a set pressure of 2 kgf / cm ^{2 which} is the set pressure set in the above-mentioned high pressure relief valve hv and is a safety measure. 1.5kg in between the standard pressure of 1kgf / cm ²
It is set to f / cm ² .

As a result, when the hot water tap 30 connected to the hot water supply pipe 3 is opened and hot water is used, the solenoid valve SV1 is opened by the control of the pressure switch P / S that senses the decrease in the pressure inside the can due to the hot water. And by pressure reducing valve V 1.
Water of somewhat high pressure controlled to 5 kgf / cm ² is fed to the water heater a, and the solenoid valve SV1 is kept open and low pressure relief is performed by the control of the flow switch FL / S that operates at this time. Since the valve lv is disconnected from the water heater a by the operation of the solenoid valve SV2, high-pressure hot water can be taken out from the hot water tap 30, and when the hot water tap 30 is closed to stop using hot water. By the control operation of the flow switch FL / S, the solenoid valve SV1 is closed to stop the water supply and the solenoid valve SV2 is opened to bring the low pressure relief valve lv into the state of connection with the water heater a. The contents are such that the pressure inside the can of the heater a is safely maintained.

[0005]

As described above, the water heater a
Is provided with a low pressure relief valve lv whose set pressure is set to low pressure and a high pressure relief valve hv which is set to high pressure, and the low pressure relief valve lv is connected to the hot water supply port 12 of the water heater a. By using hot water by opening the hot water tap 30 provided in
By the flow generated in the water supply pipe 2 or the hot water supply pipe 3,
The water heater a is controlled so as to be cut off, and when hot water is used for the water heater a, water is supplied at a high water supply pressure and when water supply is stopped, water supply is stopped. By doing so, the means for allowing the high pressure hot water to be taken out while safely maintaining the pressure inside the can of the water heater a is the hot water tap 3
A pressure switch P for controlling the solenoid valve SV1 provided in the water supply pipe 2 to be opened when hot water is taken out on the 0 side and to be closed when the hot water is taken out. There is a problem that a high precision S is required for S, which makes the pressure switch P / S difficult to manufacture.

This is because the pressure switch P / S is a water heater a.
By detecting the internal pressure of the can, the condition to set the ON operation at the internal pressure of the can and the OFF operation when the internal pressure of the can is kept below 1 kgf / cm ² Since the operation will be performed under the constraint of two conditions such as the condition that is obtained, when considering the case where the hot water tap 30 is at a high place such as the second floor (height of 5 to 6 m), The pressure range between the pressure to turn on and the pressure to turn off becomes smaller. And it must be made to work properly within this narrow pressure range.

[0007]

[Object] The present invention has been made to solve the above-mentioned problems occurring in the conventional means, and the pressure switch PS for controlling the opening / closing of the solenoid valve SV1 is set by the low pressure relief valve lv. An object of the present invention is to provide a new means for enabling a rough one that is turned on / off depending on the water supply pressure and the pressure when the hot water tap 30 is opened regardless of the can body pressure of the water heater a. To do.

[0008]

In the present invention, as means for achieving this object, a water heater,
A low-pressure relief valve set to a low pressure and a high-pressure relief valve set to a high pressure are connected to each other, and the low-pressure relief valve is connected to the hot water supply port of the water heater by using hot water on the hot water supply pipe side. The hot water supply pipe or the flow generated in the water supply pipe controls the water heater to shut off,
In a hot water supply device that controls water supply at a high water supply pressure while hot water is being used on the hot water supply pipe side, and stops water supply when hot water supply is stopped, a check valve is provided on the hot water inlet side that connects the hot water supply pipe of the water heater. Provided, a pressure switch is provided on the downstream side of the check valve, and the pressure switch is electrically connected to the flow sensor provided in the water supply pipe or the hot water supply pipe so that the solenoid valve provided in the water supply pipe is controlled to open and close by the flow. The present invention proposes a hot water supply device characterized by being connected in parallel.

[0009]

Embodiments Next, embodiments will be described in detail with reference to the drawings. The same reference numerals are used for the components having the same effects as those of the conventional ones.

FIG. 2 is a partially broken development view of a hot water supply apparatus A for carrying out the present invention. In FIG. 2, a is an ordinary boiler type water heater in which a burner device 10 is combined with a can body 1. 2 is a water supply pipe connected to a water supply port 11 serving as a water inlet of the can body 1 of the water heater a, 3 is a hot water supply pipe connected to a hot water supply port 12 serving as a water outlet of the can body 1 of the water heater a, and hv is A high pressure relief valve connected to the first relief port 13 provided in the can body 1 of the water heater a,
v is a low pressure relief valve connected to the second relief port 14 provided in the can body 1 of the water heater a, cv is a check valve connected to the hot water supply pipe 3, P
S is a pressure switch (or pressure) provided on the hot water supply pipe 3 arranged downstream of the check valve cv so as to detect a pressure drop in the hot water supply pipe 3 by opening the hot water supply plug 30 connected to the hot water supply pipe 3. Sensor), SV1 is a solenoid valve provided in the water supply pipe 2 by controlling the pressure switch (or pressure sensor) P · S to open when the pressure is detected, and V is hot water when the solenoid valve SV1 is opened. A pressure reducing valve provided on the water supply pipe 2 for reducing the pressure of the water flow fed to the can body 1 of the heater a, FL · S is a hot water supply pipe from the water supply pipe 2 through the inside of the can body 1 by opening the solenoid valve SV1. 3 is a flow switch (or flow sensor) provided to detect the flow generated in the pipeline reaching 3, and w is a solenoid valve SV1 operated by the operation of the pressure switch (or pressure sensor) P.S. The pressure switches P and S and the flow switches FL and S are electrically connected so that the solenoid valve SV1 maintains the open state while the flow switches FL and S detect the flow by the valve operation. The control circuit SV2 connected in parallel is controlled by the control circuit w so that the solenoid valve SV1 is simultaneously closed when the solenoid valve SV1 is opened, and is connected to the second escape port 14 of the can body 1 of the water heater a. An electromagnetic valve provided in connection with the low pressure relief valve lv, and 31 is an air vent valve provided on the base end side of the hot water supply pipe 3.

[0011] The high-pressure relief valve hv described above have set the set pressure to 1.9kgf / cm ^2, pressure reducing valves V provided to the water supply pipe 2 is the set pressure is set to 1.5 kgf / cm ² is there.

Further, the low pressure relief valve lv is set to a pressure lower than 1 kgf / cm ² but has a simple structure with a relief pipe 40 which rises to a height of several tens of centimeters. Then, at the upper part of the escape pipe 40, a water reservoir 41
The water heater a when the burner device 10 is repeatedly turned on and off under the control of the thermostat.
The expansion and contraction of water in the can body 1 is absorbed by raising and lowering the water level in the water reservoir 41 so that there is almost no water overflow from the overflow pipe 42 connected to the water reservoir 41. is there.

[0013]

The device of the embodiment thus constructed operates as follows. When the hot water supply tap 30 is opened, the pressure in the hot water supply pipe 3 drops, so the pressure switches P and S are turned on, and the normally closed solenoid valve SV provided in the water supply pipe 2 is operated.
1 is opened and the normally open solenoid valve S provided in the second escape port 14
V2 closes.

As a result, the can body 1 of the water heater a is set at 1.5 by the pressure reducing valve V provided in the water supply pipe 2.
High-pressure water controlled below kgf / cm ² is supplied. As a result, the pressure switches P and S are switched off by the water supply pressure, but at this time, the flow switches FL and S are simultaneously caused by the flow generated in the hot water supply pipe line from the water supply pipe 2 through the can body 1 to the hot water supply pipe 3. When it is turned on, it is kept in this state thereafter.

Next, from this state, the hot water tap 30 is closed,
When the use of hot water on the hot water supply pipe 3 side is stopped, the flow in the hot water supply pipe is stopped, and the flow switches FL and S are turned off to close the solenoid valve SV1 and stop the water supply. 2 Solenoid valve SV2 connected to the relief port 14 is opened, the low pressure relief valve lv is connected to the can body 1 of the water heater a, and the pressure inside the can is maintained below the set pressure set for this low pressure relief valve lv. Will be done.

However, the pressure in the hot water supply pipe 3 connected to the hot water supply port 12 of the can body 1 is controlled by the check valve cv provided at the base end of the hot water supply pipe 3 on the downstream side of the check valve cv. By shutting off from the can body 1 side, the can body 1 is controlled by the set pressure of the low pressure relief valve lv by the opening of the solenoid valve SV2 to lower the can body pressure on the downstream side of the check valve cv. Even if it comes, the pressure in the water supply is still maintained.

Therefore, the pressure switches P and S provided after the check valve cv are actuated off by sensing the pressure in the water supply, and the can set by the low pressure relief valve lv. A rough pressure switch may be used as long as it has nothing to do with the internal pressure and is turned on by the opening pressure when the hot water tap 30 is opened and turned off by the water supply pressure.

This is because, in the conventional water heater shown in FIG. 1, the pressure switches P and S are provided in the water supply pipe 2 to detect the pressure in the can and operate.
From a safety point of view, the pressure in the can is held off by the holding pressure in the can by the low pressure relief valve lv that sets the set pressure to 1 kgf / cm ² or less, and the pressure in the can drops from this holding pressure to the pressure when opening the hot water tap 30 That pressure difference made it necessary to make the pressure switch to operate on, whereas the precision can be significantly reduced, which makes the production easier.

[0019]

As described above, the hot water supply apparatus according to the present invention detects the pressure drop in the hot water supply pipe when the hot water is used and the high pressure in the hot water supply pipe when the hot water is not used to detect the hot water supply pipe. 2 is provided on the hot water supply port 12 side connecting the hot water supply pipe 2 of the water heater a with pressure switches P and S for controlling the on / off of the solenoid valve SV1
The pressure switches P and S are arranged downstream of the check valve cv provided on the hot water supply port 12 side to shut off the can body pressure of the water heater a via the check valve cv. Switch P
-S is turned off by the water supply pressure and turned on by the opening pressure when the hot water tap 30 is opened, regardless of the internal pressure of the can set by the low pressure relief valve lv provided in the can body 1 of the water heater a. It's good that it works, so rough ones are fine and easy to make.

Further, according to the means of the present invention, even if the pressure switch P / S becomes independent of the pressure inside the can, and the pressure inside the can is lower than the on-operation pressure set in the pressure switch, It will not be turned on unless the pressure in the hot water supply pipe 3 after the check valve cv drops, so the internal pressure of the can set by the low pressure relief valve lv can be freely set to a low pressure. The valve lv may be a simple one in which the relief pipe 40 rises to a height of several tens of meters. In addition, in this way, the low pressure relief valve lv
With the configuration of 0, by connecting the water reservoir 41 to the upper end portion of the escape pipe 40, the water in the can body 1 of the water heater a is turned on / off by the control by the thermostat. By repeating expansion and contraction by repeating the above, the overflow from the upper end of the escape pipe 40 is covered by raising and lowering the water level in the water reservoir 41, and overflow from the overflow pipe 42 to the outside. Can be suppressed.

[Brief description of drawings]

FIG. 1 is a development view of a conventional hot water supply device.

FIG. 2 is a partially cutaway development view of the hot water supply apparatus according to the present invention.

[Explanation of symbols]

A ... Hot water supply device, a ... Water heater, lv ... Low pressure relief valve, hv ...
High pressure relief valve, cv ... Check valve, V ... Pressure reducing valve, P / S ... Pressure switch (pressure sensor), FL / S ... Flow switch (flow sensor), SV1 ... Solenoid valve, SV2
... solenoid valve, w ... control circuit, 1 ... can body, 10 ... burner device, 11 ... water inlet, 12 ... hot water inlet, 13 ... first escape port,
14 ... 2nd escape port, 2 ... water supply piping, 3 ... hot water supply piping, 30
... hot water tap, 31 ... air vent valve, 40 ... escape pipe, 41 ... water reservoir, 42 ... overflow pipe,

Claims (1)

[Claims] 1. A water heater a is provided with a low pressure relief valve lv set to a low pressure and a high pressure relief valve hv set to a high pressure, and the low pressure relief valve lv is connected to the water heater a. The hot water supply pipe 3 connected to the hot water supply port 12 is controlled to shut off the water heater a by the flow generated in the hot water supply pipe 3 or the water supply pipe 2 due to the use of hot water. In the hot water supply device which is controlled to supply water at a high water supply pressure while hot water is being used on the hot water supply pipe 3 side and to stop water supply when hot water is stopped, the hot water supply port 12 side connecting the hot water supply pipe 3 of the water heater a Is provided with a check valve cv, and a pressure switch P · S is provided downstream of the check valve cv.
Hot water supply is characterized in that S is electrically connected in parallel to a flow sensor FL · S provided in the water supply pipe 2 or the hot water supply pipe 3 so as to control the opening / closing of the solenoid valve SV1 provided in the water supply pipe 2 by the flow. apparatus.