JPH05231713A - Hot-water supply equipment - Google Patents

Abstract

PURPOSE:To improve hot-water supply characteristics at the time of the rise of the shower, etc., of a large quantity of hot water corresponding to the capacity of a hot-water supply equipment, and to enhance facility by mixing hot water at a high temperature heated by a heat exchanger with water. CONSTITUTION:A water path M with a water-quantity detector 2, a heat exchanger 3 and a heat-exchanger temperature detector 4, a water path S, to which an on-off valve 5 is mounted, and a water path T, where the water paths M, S are joined, are provided. The on-off valve 5 is left as it is closed by a controller 10 at the time of startup, the heat exchanger 3 is heated by the quantity of combustion required for reaching a set temperature by the controller 10 when the on-off valve 5 is opened, and the on-off valve 5 is opened by the controller 10 when water heated according to the signal of the water temperature detector 4 reaches a value or more obtained by adding a fixed temperature to the set temperature of a hot-water supply equipment. Accordingly, the rise of the water temperature of the hot-water supply equipment at the time of start-up is quickened, and the rise of the water temperature of the faucet of a piping nose is accelerated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater having improved hot water outlet temperature characteristics at the start of operation.

[0002]

2. Description of the Related Art Conventionally, this type of water heater has a structure as shown in FIG.

Water passes through the water inlet temperature detecting device 1 from the water inlet and is divided into two paths downstream thereof, and the water in one of the water passages M passes through the water amount detecting device 2 and absorbs heat in the heat exchanger 3. The water in the other water passage S passes through the on-off valve 5, merges with the hot water from the water passage M, passes through the hot water outlet temperature detection device 4 in the water passage T, and is discharged from the faucet. The hot water heated in the heat exchanger 3 and the water flowing in the water passage S are mixed in the water passage T, and a large amount of hot water according to the ability of the water heater can be obtained. In the figure, 6 is an original solenoid valve, 7 is a proportional valve for controlling gas supply, 8 is a burner, 9 is a fan for sending combustion air to the burner, 23 is a signal input from each sensor connected by wire, A control means for controlling the proportional valve 7 and the fan 9 and an input indicator 14 as a remote controller.

[0004]

However, in the water heater having such a configuration, the opening / closing valve 5 is opened immediately after the operation is started, and the heat exchanger 3 is opened with the combustion amount required to reach the set temperature. When heated, as shown at 1 in FIG. 5, the water from the water passage S slows the rise of the hot water temperature of the water heater,
As shown by 2 in FIG. 5, the faucet at the pipe end has a problem that the rising of the hot water temperature is further delayed and the hot water supply characteristics at the start of operation are deteriorated.

Therefore, in order to solve the above-mentioned conventional problems, the present invention speeds up the rise of the hot water temperature of the water heater at the start of operation to accelerate the rise of the hot water temperature of the faucet at the end of the pipe to start the operation. An object of the present invention is to provide a water heater with excellent hot water supply characteristics and convenience in use.

[0006]

In order to achieve the above object, the first means of the water heater of the present invention is a water passage M having a heat exchanger and a water amount detecting device, and a water passage M parallel to the water passage M. A water passage S provided with an on-off valve for the passage, a water passage T having the water passage M and the water passage S merged and having a hot water outlet temperature detection device, and a signal from the water amount detection device to start operation and open the on-off valve. Control the amount of combustion required to heat the heat exchanger to reach the set temperature when the valve is opened, and open / close the valve if the hot water temperature from the hot water temperature detection device signal exceeds the set temperature plus a predetermined temperature. The control means for opening the valve is provided.

The second means of the water heater according to the present invention starts operation in response to a signal from the water amount detecting device and reaches the set temperature when the on-off valve is opened, so that the amount of combustion required to heat the heat exchanger is increased. In addition, a control means for controlling the combustion amount to which a predetermined combustion amount is added, and opening the open / close valve when the hot water discharge temperature by the signal of the hot water discharge temperature detection device is equal to or higher than a value obtained by adding a predetermined temperature to the set temperature It is a thing.

[0008]

In the water heater of the present invention, the on-off valve is closed at the start of operation by the above-mentioned first means, and the heat exchanger is heated with the amount of combustion required to reach the set temperature when the on-off valve is opened. ,
When the hot water temperature from the hot water temperature detection device signal exceeds the set temperature plus a predetermined temperature, the open / close valve is opened to speed up the rising of the hot water temperature of the heat exchanger at the start of operation. It is a water heater that has excellent hot water supply characteristics at the start and is easy to use.

In the water heater of the present invention, by the above-mentioned second means, the opening / closing valve is closed at the start of operation, and a predetermined amount of combustion is added to the amount of combustion required to reach the set temperature when the opening / closing valve is opened. The heat exchanger is heated by the amount of combustion, and when the hot water temperature from the hot water temperature detection device signal exceeds the set temperature plus a predetermined temperature, the on-off valve is opened to exchange heat at the start of operation. The hot water temperature of the water heater rises faster, and the water heater has excellent hot water supply characteristics at the start of operation and is easy to use.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, water passes through a water inlet temperature detecting device 1 from a water inlet, and is divided into two paths downstream thereof, and the water in one of the water passages M passes through a water amount detecting device 2 and is heated by a heat exchanger 3. Absorbs. The water in the other water passage S passes through the on-off valve 5,
The hot water is discharged from the faucet through the hot water outlet temperature detection device 4 in the water passage T that has joined the hot water from the water passage M. The fuel gas passes from the gas inlet through the original solenoid valve 6 and the gas proportional valve 7, is mixed with combustion air by the fan 9, and is burned by the burner 8.

The operation start of the water heater is input by the operation switch 15 of the external input device 14, the set temperature is input by the temperature switches 16, 17, 18 of the external input device 14, and the hot water temperature of the appliance is input to the water passage T. The provided hot water temperature detection device 4 converts the signal into an electric signal, and the output signal is input to the control device 10. Similarly, the incoming water temperature is converted into an electric signal by the incoming water temperature detecting device 1 provided in the water passage M, and the incoming water amount is converted into an electric signal by the water amount detecting device 2 provided in the water passage M, and the output signal thereof is controlled. Input to the device 10.

The control device 10 includes an external input device 14, an incoming water temperature detecting device 1, a water amount detecting device 2, and a tap water temperature detecting device 4.
Combustion amount determining means 11 for determining the combustion amount of the burner 8 according to the input signal, and combustion for driving the original solenoid valve 6 for gas, the proportional valve 7 for gas, and the fan 9 for combustion air so that the determined combustion amount is achieved. It comprises an amount control means 12 and an on-off valve control means 13 which drives the on-off valve 5 of the water passage S by an input signal of the hot water outlet temperature detecting device 4.

FIG. 2 shows an example of a specific circuit of the control device 10. The control device 10 includes a microcomputer 21 and peripheral devices. The microcomputer 21 shown here is a so-called one-chip microcomputer having a CPU, a ROM, a RAM, and an input / output unit.

The incoming water temperature detecting device 1, the water amount detecting device 2, and the outgoing hot water temperature detecting device 4 are an analog multiplexer 19, A
It is connected to the microcomputer 21 via the / D converter 20, and each input signal is sent. On the other hand, from the output section of the microcomputer 21, the D / A converter 22
An electric signal is sent to the original solenoid valve 6 for gas, the proportional valve 7 for gas, the fan 9 for combustion air, and the opening / closing valve 5 via.

Next, an example of an operation sequence diagram of the water heater is shown in FIG. In step S1, the operation switch 15 of the external input device 14 is turned “ON”, and the temperature switches 16, 17,
Input the set temperature with 18. When the faucet is opened in step S2 and water flows into the water passage M and the amount of water input by the water amount detection device 2 becomes equal to or greater than the amount of ignition water, the ignition sequence is entered in step S3. In step S4, the temperature switch 1 of the external input device 14 is opened when the open / close valve 5 is opened by the input signals of the external input device 14, the incoming water temperature detection device 1, and the water amount detection device 2.
Burner 9 required to reach the set temperature of 6, 17 and 18
Is determined, and the gas proportional valve 7 is adjusted so that the combustion amount determined in step S5 is achieved. When the input signal of the hot water outlet temperature detecting device 4 becomes higher than the input signal of the external input device 14 by a constant temperature in step S6, the open / close valve 5 is opened in step S7. In steps S8 and S9, the gas proportional valve 7 is adjusted so that the input signal of the tap water temperature detecting device 4 becomes the same as the input signal of the external input device 14. When the amount of incoming water detected by the water amount detecting device 2 becomes equal to or less than the amount of fire extinguishing water in step S10, the combustion of the burner 10 is stopped in step S11, the on-off valve 5 of the water passage S is closed in step S12, and
Return to 2.

According to such a sequence, the opening / closing valve 5 is kept closed at the start of the operation, and the heat exchanger 3 is heated with a combustion amount required to reach the set temperature when the opening / closing valve 5 is opened. .. Then, when the hot water discharge temperature according to the signal from the hot water discharge temperature detection device 4 becomes equal to or higher than the value obtained by adding a predetermined temperature to the set temperature of the hot water heater, the open / close valve 5 is opened, as shown in 3 of FIG. The hot water temperature rises faster, and the hot water temperature rises faster at the faucet at the pipe end, as shown in 4 of FIG.
It is a water heater with excellent hot water supply characteristics at the start of operation and is easy to use.

As another embodiment of the present invention, the control device 10
The control device (not shown) replaced by
It is necessary to set the temperature of the temperature switches 16, 17, 18 of the external input device 14 when the open / close valve 5 is opened by the input signals of the external input device 14, the incoming water temperature detection device 1, and the water amount detection device 2 at 4. The combustion amount obtained by adding a predetermined combustion amount to the combustion amount is determined as the combustion amount of the burner 9.

According to such a sequence, the opening / closing valve 5 is kept closed at the start of the operation, and a predetermined amount of combustion is added to the amount of combustion required to reach the set temperature when the opening / closing valve 5 is opened. The heat exchanger 3 is heated by the amount of combustion. Then, when the hot water discharge temperature according to the signal from the hot water discharge temperature detection device 4 becomes equal to or higher than a value obtained by adding a predetermined temperature to the set temperature, the on-off valve 5 is opened to increase the hot water temperature of the water heater at the start of operation. By making the water temperature faster than 3 in 5 and making the hot water temperature rise at the faucet at the pipe end faster than in 4 in FIG. 5, a water heater with excellent hot water supply characteristics at the start of operation can be provided.

When considering the case where the faucet is opened beyond the capacity of the water heater, a water amount control device is additionally provided after the heat exchanger 3 in the water passage M, which is provided with a water amount control valve to restrict the water flow amount. do it.

[0021]

As described above, according to claim 1 of the water heater of the present invention, the amount of combustion required to reach the set temperature when the opening / closing valve is opened while the opening / closing valve is closed at the start of operation. The heat exchanger is heated with, and the open / close valve is opened when the hot water temperature from the hot water temperature detection device signal exceeds the set temperature plus a predetermined temperature. The rising speed is increased and the temperature of the hot water at the faucet at the pipe end is increased, which makes the water heater easy to use and has excellent hot water supply characteristics at the start of operation.

Further, according to the second aspect of the present invention, the predetermined amount of combustion is added to the amount of combustion required to reach the set temperature when the on-off valve is opened while the on-off valve is closed at the start of operation. The heat exchanger is heated with the amount of combustion, and the open / close valve is opened when the hot water temperature from the hot water temperature detection device signal exceeds the set temperature plus the specified temperature. The rise of temperature can be accelerated.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a water heater according to the present invention.

[Figure 2] Circuit diagram

FIG. 3 is the same sequence diagram.

FIG. 4 is a configuration diagram of a conventional water heater.

[Figure 5] Hot water supply characteristic diagram

[Explanation of symbols]

 2 Water amount detecting device 3 Heat exchanger 4 Heat exchanger temperature detecting device 5 Open / close valve 13 Open / close valve control means M, S, T Water passage

Claims (2)

[Claims] 1. A heat exchanger provided in one of the water passages for heating the water, a water amount detecting device for detecting the amount of water entering and the operating state of the water, and the one water passage for the heat exchanger and the water amount detecting device. Is provided in the other water passage connected in parallel to the place where the water is provided, an on-off valve that opens and closes this water passage, a hot water temperature detection device provided in the water passage where the two water passages merge, and a signal of the water amount detection device When the opening / closing valve is opened by the operation by the above, the detected temperature of the hot water temperature detecting device reaches a set temperature, and the heat exchanger is controlled to a required combustion amount to heat the heat exchanger. A water heater having a control means for opening the open / close valve when the detected temperature is equal to or higher than a value obtained by adding a predetermined temperature to a set temperature. 2. A predetermined combustion amount required to heat the heat exchanger because the temperature detected by the hot water temperature detection device reaches a set temperature when the operation is started by the signal of the water amount detection device and the on-off valve is opened. 2. The control means for controlling the combustion amount by adding the combustion amount of No. 1, and opening the on-off valve when the temperature detected by the hot water temperature detecting device is equal to or higher than a value obtained by adding a predetermined temperature to the set temperature. The water heater according to claim 1, which is provided in place of the control means.