JP2003279152A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply device from which excessively heated water is not running down at the initial stage of use after installation so that the user will not feel uncomfortable. <P>SOLUTION: This water heater has a combustion body with a water storage tank, a combustion means to heat hot water in the water storage tank to a prescribed temperature, an input path to and an output path from the water storage tank, a bypath separated from the input path and connected to the output path, a mixing means to mix water from the input path and hot water from the output path at the contact between the input path and the bypath. A stored hot water amount detection means to detect the amount of stored hot water in the water storage tank is provided to the water heater so that the temperature setting can be changed according to the amount of stored hot water detected using this means. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a heating means for heating hot water in a hot water storage tank to a predetermined set temperature, and a water inlet and a hot water outlet for the hot water storage tank and a branch from the water inlet. The present invention relates to a hot water supply device comprising: a bypass passage connected to a hot water outlet passage; and a mixing means for mixing water from the water inlet passage and hot water from the hot water outlet passage at a connection portion between the hot water outlet passage and the bypass passage.

[0002]

2. Description of the Related Art A conventional water heater will be described below. FIG. 3 is a configuration diagram of the hot water supply device. The water heater is
As shown in the figure, the combustion can 1, the water inlet 10 through which water enters from the water supply source (not shown) to the hot water storage tank 2 provided in the combustion can 1 via the water source valve 27, and the burner. 1
The hot water in the hot water storage tank 2 heated in 3 is formed by the hot water discharge passage 19. Further, the hot water storage tank 2 is provided with a hot water storage temperature sensor 9 for detecting the temperature of hot water in the hot water storage tank 2. Furthermore, the bypass passage 17 that is branched from the water inlet passage 10 and is connected to the hot water outlet passage 19 without the hot water storage tank 2 and the high temperature hot water in the hot water storage tank 2 at the confluence of the bypass passage 17 and the hot water outlet passage 19. A mixing valve 18 for mixing and controlling water sent from the bypass 17 by a stepping motor M is provided. At the outlet of the mixing valve 18, there is a mixing passage 11 through which mixed hot water comes out, and it is connected to a hot water tap 28. Further, in the water inlet channel 10, a water temperature sensor 14 for detecting the temperature Tc of the water from the water supply source, a water amount sensor 8 for detecting the water amount Q, and an upstream side of the mixing valve 18 (the hot water tank 2
The hot water tank outlet temperature sensor 15 that detects the outlet temperature Th of the hot water tank 2 is provided in the hot water outlet path 19), and the mixed hot water temperature Tm after mixing is provided in the mixing path 11 downstream of the mixing valve 18. A mixed hot water temperature detection sensor 16 for detecting is provided.

The burner 13 includes a fan 3 for supplying air necessary for combustion, a nozzle 5 for supplying kerosene to form a flame, a spark plug 6 required for ignition,
It is composed of CdS7 or the like that detects the presence or absence of a flame. Further, a kerosene supply pipe 12 for supplying kerosene to the nozzle 5 provided in the burner 13 is provided, and the kerosene supply pipe 12 is provided with an electromagnetic pump 4 for pumping kerosene to the nozzle 5.

A bath heat exchanger 20 is provided in the hot water storage tank 2 and is connected to a circulation adapter 25 provided in a bath 26 via a bath pipe 24. Further, the bath pipe 24 is provided with a circulation pump 21 for stirring the hot water in the bathtub 26, a bath temperature sensor 22 for detecting the temperature Tf of the hot water, and a bath water flow switch 23 for detecting the presence or absence of the hot water. To be

The water heater further includes the sensors 14,
Detection signals (Tc, Q, from 8, 15, 16, 9, 22)
Th, Tm, Tk, Tf) and a set temperature signal (Ts, Tsh) from a hot water supply temperature setting switch and a bath temperature setting switch provided on a remote controller (not shown), the electromagnetic pump 4, the circulation pump 21, the burner 13 A control unit (not shown) for controlling the mixing valve 18 and the like is also provided. Further, the remote controller is provided with an operation switch for starting the operation of the hot water supply device.

Based on the above construction, the operation of the conventional water heater will be described with reference to FIG. In step S11, it is determined whether or not the operation switch is turned on. When it is determined that the operation switch is turned on, even if hot water is not actually used from the hot water tap 28 or the like, the predetermined high temperature Tks ( In order to keep the temperature of the hot water in the hot water storage tank 2 at, for example, 80 ° C., the burner 13 is repeatedly turned on and off with the maximum combustion capacity (step S12). Then, when the hot water tap 28 is opened and the use of hot water is actually started, the water from the water supply source passes through the water inlet 10, the water amount sensor 8, the hot water tank 2, the hot water outlet 19 and the bypass pipe 17. Flows out, is mixed by the mixing valve 18, and emerges from the mixing passage 11.

The controller (not shown) controls the water temperature Tc detected by the water temperature sensor 14 in the water inlet 10 and the hot water outlet 1.
9. Hot water outlet temperature Th detected by hot water tank outlet temperature sensor 15
And the set hot water supply temperature Ts set by the user with the remote controller, the mixing ratio of the water flowing through the bypass passage 17 and the hot water flowing through the hot water discharge passage 19 is adjusted so that the hot water after hot water mixing reaches the set hot water supply temperature Ts. The control signal is output to the mixing valve 18 so that the calculated mixing ratio can be calculated by the following calculation formula (1). When using hot water: Mixing ratio = (Ts-Tc) / (Th-Tc) (1) When hot water supply is stopped: Mixing ratio = (Ts-Tc) / (Tks-Tc) (2) The water amount sensor 8 is used to judge when hot water is used and when hot water is stopped.
The detected water flow rate Q is detected. That is, when the detected incoming water flow rate Q is detected, it is determined that the hot water supply is in use, and when the detected incoming water flow rate Q is not detected, it is determined that the hot water supply is stopped. As a result, the hot water from the hot water outlet 19 and the water from the bypass 17 are mixed at an appropriate mixing ratio, and become hot water of the set hot water supply temperature Ts set by the remote controller and flow into the mixing passage 11. During this time, the burner 13 performs a combustion operation for maintaining the hot water in the hot water storage tank 2 at a predetermined high temperature Tks (for example, 80 ° C.). In addition, when the bath is reheated, the circulation pump 21 is operated so that the hot water in the bathtub 26 is heated by the bath heat exchanger 2.
This is performed by indirectly heating with hot water in the hot water storage tank 2 via 0, and the hot water in the bathtub 26 is boiled up to the bath set temperature Tsh set by a remote controller (not shown).

[0008]

Immediately after the hot water supply device is installed, the inside of the hot water storage tank 2 is empty, and the water supply source valve 27 is opened to start use.
At this time, if the operation switch has already been turned on, the burner 13
Is a predetermined high temperature Tks (for example, 8
Combustion is started to keep the temperature at 0 ° C. On the other hand, when the hot water tap 28 is opened in this state, the water amount is detected by the water amount sensor 8. Therefore, the mixing valve 18 is controlled by the mixing ratio calculated by the above-mentioned arithmetic expression (1). At this time, the hot water storage tank 2 is not full of water, so the hot water outlet 19 is not yet filled with hot water. Therefore, the hot water outlet temperature Th detected by the hot water tank outlet temperature sensor 15 becomes the temperature of the air in the hot water outlet passage 19, and the mixing ratio calculated by the above equation (1) sets the mixing valve 18 to the fully open position on the hot water side, namely the hot water outlet passage 19 The side is in the fully open position. Therefore, the mixing valve stands by at this position.

When the hot water storage tank 2 is filled with the hot water, the hot water fills the hot water discharge path 19 and the hot water storage tank outlet temperature sensor 15
Detects the hot water temperature (for example, 80 ° C.) and controls the mixing valve 18 at the mixing ratio calculated by the above-mentioned calculation formula (1). However, since the mixing valve is already waiting at the hot water fully open position, the high temperature is initially set. There is a problem that the user may feel uncomfortable when hot water comes out. Therefore, an object of the present invention is to provide a hot water supply device which does not generate high temperature hot water in the initial stage of use after installation and does not cause any unpleasant feeling.

[0010]

In order to achieve the above object, the first aspect of the present invention is to provide a heating means for heating the hot water in the hot water tank to a predetermined set temperature, and an inlet for the hot water tank. A water channel and a hot water channel, a bypass channel that branches from the water channel and is connected to the hot water channel, and water from the water channel and hot water from the hot channel at the connection between the hot water channel and the bypass channel. A hot water supply device including mixing means for mixing, comprising hot water storage amount detecting means for detecting the hot water storage amount in the hot water storage tank, and changing the set temperature when the hot water storage amount detected by the hot water storage amount detecting means is equal to or less than a predetermined amount. I decided to do so
Hot water does not come out at the beginning of use after installation.

According to a second aspect of the present invention, heating means for heating the hot water in the hot water storage tank to a predetermined set temperature, a water inlet and a hot water outlet for the hot water storage tank, and a branch from the water inlet passage are connected to the hot water outlet. In a hot water supply device comprising a bypass passage, a mixing means for mixing water from the water inlet passage and hot water from the hot water outlet passage at a connection portion between the hot water outlet passage and the bypass passage,
Since the hot water storage amount detecting means for detecting the hot water storage amount in the hot water storage tank is provided, the mixing ratio of the mixing means is changed when the hot water storage amount detected by the hot water storage amount detecting means is equal to or less than a predetermined amount. Moreover, high temperature hot water does not come out at the beginning of use after installation.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. Since the configuration of this embodiment is the same as that of the conventional technique, description thereof will be omitted. FIG. 1 is a flowchart showing the operation of the hot water supply device according to one embodiment of the present invention. First, in step S1, it is determined whether or not the operation switch is on, and if it is determined to be on, it is determined whether or not the amount of hot water stored in the hot water storage tank 2 is less than a predetermined value (step S2). Then, when it is determined in step S2 that the hot water storage amount is less than the predetermined value, the set temperature of the hot water in the hot water storage tank 2 is set to the first set temperature (for example, 45 ° C.) (step S).
3). When it is determined in step S2 that the hot water storage amount is equal to or greater than the predetermined value, the set temperature of the hot water in the hot water storage tank 2 is set to the second set temperature (for example, 80 ° C.) higher than the first set temperature in step S4. To do. Then, in step S5, in order to keep the temperature of the hot water in the hot water storage tank 2 at the set temperature, the burner 13 is repeatedly turned on and off at the maximum combustion capacity. Therefore, even if the hot water storage tank is not full of water at the beginning of use after installation, high-temperature hot water does not come out, and there is no unpleasant feeling. In addition, when there is a request for reheating the bath, the usability of the bath is not deteriorated by setting the second set temperature even if the amount of stored hot water does not exceed the predetermined value. As a method of detecting the amount of hot water stored in the hot water storage tank, a water pressure sensor or a water level sensor may be provided in the hot water storage tank to detect the amount of hot water, or the water amount sensor 8 calculates an integrated value of water amount after energization, and the integrated value is You may judge by whether it is more than a predetermined amount. Alternatively, the determination may be made based on the integrated time from the start of water flow after energization.

Next, another embodiment will be described with reference to FIG. First, in step S6, it is determined whether or not the operation switch is on, and if it is determined to be on, it is determined whether or not the amount of hot water stored in the hot water storage tank 2 is less than a predetermined value (step S).
7). Then, when it is determined in step S7 that the amount of stored hot water is less than the predetermined value, the mixing ratio of the mixing valve is set to a fixed value (the mixing ratio on the hot water side is reduced) (step S8). When it is determined in step S7 that the hot water storage amount is equal to or greater than the predetermined value, the mixing ratio of the mixing valve is set to the calculated value of the arithmetic expression (1) in step S9. Then, in step S5, in order to keep the temperature of the hot water in the hot water storage tank 2 at the set temperature, the burner 13 is repeatedly turned on and off at the maximum combustion capacity. Therefore, even if the hot water storage tank is not full of water at the beginning of use after installation, high-temperature hot water does not come out, and there is no unpleasant feeling.

[Brief description of drawings]

FIG. 1 is a flowchart showing an operation of a hot water supply device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing another operation of the hot water supply device according to the embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional hot water supply device.

FIG. 4 is a flowchart showing the operation of the conventional hot water supply device.

[Explanation of symbols]

1 ... Combustion can 2 ... Hot water tank 3 ... fan 4 ... Electromagnetic pump 5 ... Nozzle 6 ... Spark plug 7 ... CdS 8 ... Water quantity sensor 9 ... Hot water temperature sensor 10 ... Inlet 11 ... Mixing path 12 ... Kerosene supply pipe 13 ... Burner 14 ... Inlet temperature sensor 15 ... Hot water tank outlet temperature sensor 16. Mixed hot water temperature detection sensor 17 ... Bypass 18 ... Mixing valve 19 ... Dewaji 20 ... Bath heat exchanger 21 ... Circulation pump 22 ... Bath temperature sensor 23 ... Bath water flow switch 24 ... Bath piping 25 ... Circulation adapter 26 ... Bathtub 27 ... Water source valve 28 ... Hot water tap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsuro Takada             43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo             Inside this Yupro Co., Ltd. F term (reference) 3L036 AC25 AC28

Claims (2)

[Claims] 1. A heating means for heating hot water in a hot water storage tank to a predetermined set temperature, a water inlet and a hot water outlet for the hot water storage tank, and a bypass passage branched from the water inlet passage and connected to the hot water outlet. And a mixing means for mixing water from the water inlet passage and hot water from the hot water passage at a connection portion between the hot water passage and the bypass passage, the amount of hot water stored in the hot water storage tank is detected. A hot water supply device comprising: hot water storage amount detecting means for changing the set temperature when the hot water storage amount detected by the hot water storage amount detecting means is equal to or less than a predetermined amount. 2. A heating means for heating hot water in a hot water storage tank to a predetermined set temperature, a water inlet and a hot water outlet for the hot water storage tank, and a bypass passage branched from the water inlet passage and connected to the hot water outlet. And a mixing means for mixing water from the water inlet passage and hot water from the hot water outlet at a connecting portion between the hot water outlet passage and the bypass passage, the amount of hot water stored in the hot water storage tank A hot water supply apparatus comprising: hot water storage amount detecting means for detecting the hot water storage amount, and changing the mixing ratio of the mixing means when the hot water storage amount detected by the hot water storage amount detecting means is equal to or less than a predetermined amount.