JPH0373789B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a pre-stop hot water supply device for supplying hot water to baths, kitchens, washrooms, etc., and particularly to supplying hot water at different temperatures to multiple locations. This invention relates to a pre-stop hot water supply device that can be used.

[Conventional technology]

Generally speaking, water heaters are known to supply hot water to multiple locations such as baths and kitchens. There is a demand for a function that allows individual settings.

As a technique for supplying hot water to multiple locations, for example, as described in Utility Model Publication No. 46-22292, two stop-start water heaters are connected by a connecting pipe via a check valve to supply hot water to the bathtub. A water heater is known in which a large amount of hot water is obtained by mixing hot water from two water heaters in the case of a kitchen, and a large amount of hot water is supplied from only one water heater when hot water is supplied to the kitchen.

In addition, as a technique that can set hot water temperatures at multiple locations, for example, as described in Japanese Patent Laid-Open No. 142956/1982, the hot water supply side of the water heater is branched into two routes, and the water supply side of one system is connected to the water supply side of the water heater. A hot water supply device is known in which a mixing valve for mixing water is provided to form a hot water tap for a kitchen, and a hot water tap for a bath is configured in the other system. This type of technology is disclosed in Japanese Patent Application Laid-Open No. 58-217148.
It is also stated in the publication.

[Problem that the invention seeks to solve]

The above-mentioned multiple hot water supply technology uses hot water from one water heater to supply hot water only to the kitchen, making it relatively easy to set the temperature, but when supplying hot water to the kitchen and bathtub at different temperatures at the same time, two It was extremely difficult to set the temperature because the mixing ratio of hot water supplied from the hot water heater varied depending on the amount of hot water supplied to the kitchen and bathtub.

In addition, the technique of setting multiple hot water temperatures described in the above does not work if the hot water supply in the kitchen is performed by mixing high-temperature water and cold water, and the hot water supply to the bathtub is limited to the above-mentioned high-temperature water. This caused the problem of not being able to pour hot water.

An object of the present invention is to provide a water heater that can supply hot water at a desired temperature to a plurality of locations, respectively.

[Means for solving problems]

In order to achieve the above object, the present invention provides a first water heater and a second water heater that are installed in parallel, and the hot water supply sides of these water heaters are arranged in such a direction that the hot water supply from the first water heater is directed toward the hot water supply from the second water heater. In a pre-stop hot water supply system, which is connected via a check valve and has a hot water tap for the kitchen etc. on the inflow side of the check valve and a hot water tap for the bathroom on the outflow side, When hot water is supplied from the taps at the same time, the temperature of the hot water supplied from the kitchen hot water tap is controlled by the combustion of the first water heater, and the temperature of the hot water supplied from the bathroom hot water tap is controlled by the combustion of the second water heater. A controller was installed to

In addition, "kitchen etc." in this specification refers to a kitchen,
This refers to washrooms and other places where a relatively small amount of hot water is supplied over a wide temperature range.

[Effect]

When the water heater supplies hot water simultaneously from the hot water taps for the kitchen, etc. and the hot water tap for the bathroom, the hot water supply temperature can be arbitrarily set because hot water is supplied from the hot water tap for the kitchen, etc. only by the first water heater. By adding hot water whose temperature is controlled by combustion from the second water heater to the hot water whose temperature is set by the first water heater, the hot water supply temperature for the bathroom can be adjusted to any desired temperature. configurable.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the stop-start water heater according to the present invention will be described in detail below with reference to the drawings.

The water heater shown in FIG. 1 can be roughly divided into a water heater 100, which heats the supplied water by gas combustion.
and 200, a first water supply pipe 101 that supplies water to the water heater 100 and supplies hot water from the hot water tap 29 for the kitchen, etc., and a second water heater 200 that supplies water and supplies hot water to the bathroom hot water supply A second hot water supply pipe 102 that discharges hot water from the stopper 30, a connecting pipe 103 that connects these first and second hot water supply pipes via a check valve 23, and a connecting pipe 103 that connects the first and second hot water supply pipes via a check valve 23, and a connecting pipe 103 that connects the first and second hot water supply pipes to each other via a check valve 23, and a connecting pipe 103 that connects the first and second hot water supply pipes to each other via a check valve 23, and a connecting pipe 103 that connects the first and second hot water supply pipes to each other via a check valve 23. 1
gas pipes that supply the water heaters 100 and 200 via the water heaters 100 and 200, and remote controllers 27 and 28 that set the temperature of hot water supplied from the hot water taps 29 and 30;
It is composed of a control section 22 that controls the burnup of 0 and 200.

The water heater 100 includes a burner 7 to which gas is supplied via a proportional control valve 9, a spark plug 6 for igniting the gas in the burner 7, and an interior that is heated by combustion heat of the ignited gas. It is comprised of a heat exchanger 4 for converting passing water into hot water, a combustion fan 11 for taking in outside air during gas combustion, and a flame rod 8 for checking the ignition. Similarly, the water heater 200 includes a burner 17, a spark plug 16, a heat exchanger 14, and a combustion fan 21.
and a frame rod 18.

Next, the water supply pipes passing through these water heaters 100 and 200 will be explained with reference to FIG. 2. FIG. 2 is a piping diagram extracted from FIG. 1 to facilitate understanding of the hot water supply pipes, etc.

First, the first water heater 100 is connected to the heat exchanger 4 via a thermistor 1 that detects the temperature of water supplied from the outside, a water flow sensor 2, and a water governor 3 that keeps the water volume constant. The second water heater 200 has a system that guides hot water heated by the heat exchanger 4 to a hot water tap 29 via a temperature sensor 5, a water flow sensor 24, and a thermistor 25. A system that connects water to a heat exchanger 14 via a sensor 12 and a water governor 13, and guides hot water heated by the exchanger 14 to a hot water supply pipe 30 via hot water temperature detection thermistors 15 and 26. The connecting pipe 103 connects the thermistor 5 of the first water supply pipe 101 and the water amount sensor 24 and the thermistor 15 and thermistor 26 of the second water supply pipe 102 via the check valve 23. This is a system that connects hot water so that it flows only from the first hot water pipe 101 to the second hot water tap 102.

Therefore, due to the configuration of these hot water pipes, the hot water dispensed from the hot water tap 29 for the kitchen only goes through the first hot water pipe 101, and the hot water dispensed from the hot water tap 30 for the bathroom is Second hot water pipe 1
02 and hot water supplied from the first hot water supply pipe 101 via the connecting pipe 103.

The control unit 22 controls the water heaters 100 and 20.
Based on data on water volume and water temperature detected by each sensor 0, the gas proportional control valves 9 and 19 are controlled to open and close the valves to control hot water flowing out from the bathroom hot water faucet 30 and the kitchen hot water faucet 29. It adjusts the temperature. The amount of hot water supplied from each hot water faucet 29 and 30 is set arbitrarily by the operator by turning the faucet, and the water temperature is set by the remote controllers 27 and 28 connected to the control unit 22. This can be set arbitrarily by the operator.

In the water heater configured in this way, the control unit 22 supplies hot water at a temperature set by the operator using the remote controllers 28 and 27 to the burners 7 and 27 while monitoring the flow rate and temperature of the hot water flowing through each system. The amount of gas supplied to 17 is controlled by gas proportional control valves 9 and 19. The operation of this control section 22 will be explained below.

(A) When hot water is supplied only from the hot water tap 29 for the kitchen, etc. When the operator sets the hot water temperature using the remote control 27 and opens the hot water tap 29, the control unit 22 controls the first water heater 100. Only the provided water volume sensors 2 and 24 detect the water volume, thereby determining that only the hot water tap 29 is open.

Based on this determination, the control unit 22 controls the water heater 100.
The burner 7 starts combustion by operating the fan 11, discharging sparks from the spark plug 6, and opening the main solenoid valve 10 and gas proportional control valve 9. When this ignition is completed, the control unit 22 controls the amount of gas necessary for combustion based on the data of the water temperature obtained by the thermistor 1, the water amount obtained by the water amount sensor 2, and the hot water temperature set by the remote controller 27. The amount of gas is calculated, and the degree of opening and closing of the control valve 9 is controlled according to the amount of gas.

As a result, the control unit 22 continues supplying hot water while
The hot water supply temperature is monitored by the thermistor 5 provided at the outflow end of the water heater 100 and the thermistor 25 provided close to the hot water tap 29 for kitchen etc.,
If the set temperature and the hot water supply temperature are different, this error is controlled by the degree of opening and closing of the gas proportional control valve 9.

(B) When hot water is supplied only from the bathroom hot water faucet 30 This hot water supply is determined by the operator when the water flow rate sensors 2 and 12 detect running water and the water flow sensor 24 does not detect running water, so the control unit 22 switches the hot water faucet 3 to the hot water faucet 30.
It is determined that only 0 is open.

As a result, the control unit 22 controls the water heater 100.
With the combustion of the fan 21, the spark plug 16,
By operating the main solenoid valve 10 and the gas proportional control valve 19, combustion in the water heater 200 is started. Next, the control unit 22 uses the water amount measured by the water amount sensor 2, the hot water temperature set by the remote controller 28, and the water temperature detected by the thermistor 1 to
The gas amount supplied to the burner 7 is controlled by the control valve 9, and the gas proportional control valve 19 of the water heater 200
The amount of gas supplied to the burner 17 is controlled by. This gas amount control is performed by the first hot water supply pipe 1
The hot water temperature passing through the hot water supply pipe 101 and the hot water temperature passing through the second hot water supply pipe 102 are controlled to be the same temperature.

Therefore, when hot water is supplied only from the bathroom hot water tap 30, a large amount of hot water is supplied by mixing hot water brought to the same temperature by the water heaters 100 and 200. Further, this hot water temperature is monitored by a thermistor 26 and fed back to the control section 22.

(C) In the case of simultaneous hot water supply from the hot water tap 29 for the kitchen etc. and the hot water tap 30 for the bathroom, etc. In this case, the control unit 22 controls the hot water taps 29 and 30 to water heaters 100 and 200 are opened using the same procedure as described above.
combustion starts.

At this time, in the water heater 100, the opening/closing degree of the gas proportional control valve 9 is controlled based on the water temperature determined by the thermistor 1, the temperature set by the remote controller 27, and the water amount determined by the water amount sensor 2.
That is, the control unit 22 calculates how many times the temperature of water supplied to the water heater 100 must be raised, and based on this calculates the amount of gas to be supplied to the water heater 100, and controls the gas proportional control valve. Control the opening/closing degree.

On the other hand, the water heater 200 operates based on the water temperature determined by the thermistor 1, the temperature set by the remote controller 28, the amount of water determined by the water amount sensor 12, and the temperature and amount of hot water obtained from the water heater 100 through the connecting pipe 103. Gas proportional control valve 19
The degree of opening and closing is controlled. That is, the control unit 22 controls the temperature of hot water supplied from the water heater 200 to be added to the hot water from the water heater 100, thereby controlling the temperature of hot water supplied from the hot water faucet 30.

In this way, the hot water supply device according to the present invention has a hot water supply faucet 2.
9 and 30 are opened at the same time, priority is given to the ability of the water heater 100 to supply hot water to the hot water tap 29 for the kitchen, etc., and the temperature of the hot water by this water heater 100 and the amount of water supplied to the hot water tap 30 are adjusted. Based on this, the water heater 200 is controlled to adjust its capacity. Further, the temperature at which hot water is actually supplied by each of the hot water taps 29 and 30 is determined by the thermistors 27 and 28.
and is subjected to fieldback control by the control section 22.

Note that the water heaters 100 and 20 in the above embodiments
0 is exemplified as having the same ability, but
The present invention is not limited to this, and for example, the water heater 200 may be configured to have a capacity higher than that of the water heater 100.

〔Effect of the invention〕

As described above, according to the present invention, when two water heaters are installed in parallel and hot water is supplied from two hot water taps at the same time, priority is given to temperature control of one water heater and hot water is supplied from one hot water tap, By following the temperature control of the other water heater that is added to the hot water of one water heater, the temperature of hot water supplied from the two hot water taps can be arbitrarily set.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the stop-start type hot water supply apparatus according to the present invention, and FIG. 2 is a diagram for explaining the water flow path of the hot water supply apparatus shown in FIG. 1. 1...Thermistor for water temperature detection, 2, 12, 2
4...Water amount sensor, 3,13...Water governor, 4
and 14... heat exchanger, 5, 15, 25, 26...
...Thermistor for water temperature detection, 7, 17... Burner, 9, 19... Gas proportional control valve, 22... Control unit, 23... Check valve, 27, 28... Remote control,
29... Hot water tap for kitchen etc., 30... Hot water tap for bathtub, 100 and 200... Water heater.

Claims (1)

[Scope of Claims] 1. First and second water heaters, a first hot water pipe that connects the hot water supply side of the first water heater to a hot water faucet for kitchens, etc., and A second hot water supply pipe that connects the hot water supply side and the bathroom hot water tap, and a back check for connecting the first hot water supply pipe and the second hot water supply pipe in the direction from the first hot water supply pipe to the second hot water supply pipe. When hot water is supplied from the connecting pipe and kitchen hot water tap via a valve, only the first water heater is combusted, and when hot water is supplied from the bathroom hot water tap, the first and second water heaters are operated. and a hot water temperature setting means for setting the temperature of hot water from the kitchen hot water faucet and the bathroom hot water faucet, respectively. water amount detection means for detecting the amount of water supplied by the water heater, and temperature detection means for detecting the temperature of hot water supplied from the first and second water heaters;
bypass water amount detection means for detecting the amount of water flowing from the first water heater to the hot water supply side of the second water heater via the connecting pipe; control so that the hot water supply temperature by the operation of the first water heater is the hot water supply temperature for the kitchen, etc. set by the temperature setting means, based on the water amount and temperature obtained by the temperature detecting means and the bypass water quantity detecting means. and a control means for controlling combustion of the second water heater so that the temperature of the mixed hot water supplied from the first and second water heaters becomes the bathroom hot water temperature set by the temperature setting means. A stop-start water heater that is characterized by: