JP2605153B2 - Instant water heater hot water supply mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a hot water supply mechanism of an instantaneous water heater.

[Prior art]

Conventionally, in the instant water heater, the temperature of the tap water is adjusted by changing the combustion amount of a burner that heats the heat exchanger. Although the combustion range of the burner is designed to be as wide as possible by using a plurality of burners, there is a limit to this. When the maximum combustion amount is increased, the minimum combustion amount is correspondingly increased.

[Problems to be solved by the invention]

By the way, with the instantaneous water heater, it is difficult to obtain an appropriate temperature (for example, about 35 ° C.) hot water with a small flow rate when the temperature of clean water is high in summer. If the burner is ON-OFF controlled, the average combustion amount can be reduced, but this ON-OFF control is not practical because it greatly changes the tapping temperature. Therefore, the present invention provides a water path in which water is passed in parallel to the hot water path to enable a small amount of hot water to be supplied at a low temperature even when the tap water temperature is high, and to increase the hot water supply control range. It is an object to provide a hot water supply mechanism.

[Means for Solving the Problems]

The hot water supply mechanism of the instantaneous water heater of the present invention is shown in FIGS.
As illustrated in the figure, the hot water obtained by heating the hot water path after the supply water to be heated is split into a hot water path including a heat exchanger and a water path provided in parallel to the hot water path. A hot water supply mechanism of an instantaneous water heater that mixes water from the water path to supply hot water, and detects a burner that burns a fuel gas to heat the heat exchanger and a temperature of the hot water on the hot water path side. A temperature sensor, and a valve element for changing a flow ratio of hot water in the hot water path and water in the water path at a junction of the hot water path and the water path, and connected to the valve element and supported to move forward and backward. An actuating element, wherein the valve element is moved by a heat-responsive element that expands or contracts by detecting the temperature of the hot water at the merging section side, and a bias spring acts to open the water path side; Return spring for applying a return force to the bias spring against the bias spring An operating mechanism for controlling the valve element through the operating element, a mixing valve including a merging flow path for merging the hot water passing through the valve body with the water, and a hot water temperature for setting a tapping water temperature in the merging flow path A setter for controlling on / off control or proportional control of the supply of combustion gas to the burner in accordance with the set hot water temperature by the hot water temperature setter and the hot water temperature detected by the temperature sensor, and controlling the operating mechanism to control the valve; Control means for adjusting the position of the body and always controlling the detected hot water temperature to be higher than the set hot water temperature by a predetermined temperature, and from the hot water system side by a predetermined temperature higher than the set hot water temperature. By supplying hot water at a temperature and water from the water system to the mixing valve, the valve element is moved by a temperature-sensitive operation of the thermoresponsive element to change the flow rate ratio between the hot water and the water. By the said merging Characterized in that to perform the tapping of the set hot water temperature from.

[Operation]

The hot water supply mechanism of this instantaneous water heater is obtained by dividing the supply water to be heated into a hot water path including a heat exchanger and a water path provided in parallel with the hot water path, and then heating the hot water path. Hot water is mixed with hot water from the water channel to supply hot water. Then, the hot water temperature is set by the hot water temperature setting device, and the control means controls the supply of the combustion gas to the burner as control for obtaining the hot water temperature based on the hot water temperature detected by the temperature sensor. At the same time, the position of the valve element of the mixing valve is adjusted. The control of the combustion gas is performed by on / off control or proportional control. In this case, the control means controls the detected hot water temperature to be always higher than the set hot water temperature by a predetermined temperature (for example, 20 ° C.). By the way, the mixing valve is a valve element that changes the flow ratio of hot water in the hot water path and water in the water path at the junction of the hot water path and the water path. A bias is applied to the actuating body and the valve body, in which the valve element is moved forward and backward by the heat-responsive element which expands or contracts by detecting the temperature of the hot water to move the valve body, and a bias spring is applied to open the water path side. It has a return spring for applying a return force opposing the spring, an operating mechanism for controlling the valve element through the operating element, and a merging flow path for joining hot water and water that have passed through the valve element. Hot water having a temperature higher than a set hot water temperature by a predetermined temperature from the hot water system side and water from the water system side are supplied to the junction provided with the mixing valve, and the position of the valve body is set by the control means. After that, the thermo-responsive element detects the temperature of hot water coming out of the junction side, and as a result, the valve element moves forward and backward independently. As a result,
The flow rate ratio of hot water and water is independently corrected, and as a result, hot water supply at the set hot water temperature is obtained. Therefore, according to such a hot water supply mechanism, even when the minimum combustion amount of the burner is relatively large, it is possible to obtain hot water at a low flow rate with a small flow rate without causing inconvenience such as boiling, and the hot water supply control range is reduced. It is enlarged.

【Example】

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 shows an embodiment of a hot water supply mechanism of an instantaneous water heater according to the present invention. A water heater 2 is provided in the hot water path 1 for heating the water supply.
Of the heat exchanger 3 is installed. In parallel with the hot water path 1, a branch is made on the upstream side of the heat exchanger 3 and the mixing valve 4 is made on the downstream side.
A water path 5 is provided for merging through the water path. As shown in FIGS. 3 (a) and 3 (b), the mixing valve 4 moves the valve body 8 by the heat responsive element 7 provided in the merging flow path 6 to move the water path 5 and the hot water path 1 together. An operation mechanism 9 such as an electric operation mechanism that adjusts the operation position of the heat responsive element 7 and that is configured to change the flow rate ratio is provided. The thermally responsive element 7 has a configuration in which wax is sealed and thermally expanded, for example,
The direction of movement of the valve element 8 due to the expansion is such that the amount of hot water in the hot water path 1 is reduced and the amount of water in the water path 5 is increased.
This thermoresponsive element 7 is actuated by an operating body 11 via a bias spring 10.
The operating position is adjusted by the
As described above, 11 is configured to be operated by the operation mechanism 9 such as an electric operation mechanism and moved in the vertical direction in the figure. In the above configuration, FIG. 3 (a) shows a state where the amount of hot water in the hot water path 1 is large, and in this state the wax expands and the heat responsive element as shown in FIG. 3 (b). When the thermal expansion 7 occurs, the valve element 8 is moved downward to reduce the amount of hot water in the hot water path 1 and to increase the amount of water in the water path 5 so that the temperature of the hot water in the merged channel 6 decreases. Thermal response element 7 too low
When the valve contracts, the valve element 8 is moved upward to reduce the amount of water in the water path 5 and increase the amount of hot water in the hot water path 1 to raise the temperature of the hot water in the junction flow path 6, thereby reducing the temperature of the hot water flowing through the junction flow path. Can be controlled. When the thermal response element 7 is moved downward by the operating mechanism 9, the set hot water temperature can be lowered, and when it is moved upward, the set hot water temperature can be raised. 12 is a burner for heating the heat exchanger 3, 13 is a controller, and 14 is a hot water temperature setting device. The controller 13 controls the amount of combustion of the burner 12 and the operating mechanism 9 based on the set hot water temperature of the hot water setter 14 and the hot water temperature from a temperature sensor 15 such as a thermistor provided downstream of the heat exchanger 3. Is operated to set the operation position of the thermally responsive element 7. For example burner 12
Control is usually at a predetermined temperature higher than the set hot water temperature, that is, 20 ° C.
By performing proportional control so that only the hot water temperature becomes high, a stable hot water temperature can be obtained in combination with the operation of the mixing valve 4.
In the summer, the temperature of clean water is high (for example, about 25 ° C),
When the set temperature is low (about 35 ° C.) and the amount of hot water is small (for example, about 3 to 4 / min), even when the hot water temperature exceeds the set temperature even with the minimum combustion amount of the proportional control. Turns on / off the burner as shown in Fig. 2.
This can be dealt with by controlling and reducing the average combustion amount. Even if the burner 12 is ON-OFF controlled in this way, the hot water temperature is adjusted in the mixing valve 4, so that the hot water temperature does not fluctuate. In the figure, reference numeral 16 denotes a flowing water switch, 17 denotes a water amount control valve, 18 denotes a check valve, 19 denotes a tap hole, and 20 denotes a return spring.

【The invention's effect】

As described above, according to the present invention, the following effects can be obtained. a.Adjust the supply amount of the combustion gas to the burner according to the set hot water temperature, adjust the position of the valve element of the mixing valve, and adjust the position of the valve element by the action of the thermoresponsive element based on the outlet temperature. As a result, it is possible to perform hot water supply in which the flow ratio of hot water and water is adjusted by the hot water temperature, and to perform hot water supply in accordance with the set hot water temperature without being affected by changes in the water supply temperature or changes in the water supply amount. it can. b. Since the set temperature of the burner can be set higher than the tapping temperature, stable tapping can be performed at a low temperature by mixing with water. c. A small amount of hot water at a low temperature can be supplied even when the minimum burner of the burner is relatively large, and even when the temperature of clean water is high in the summer, it is possible to obtain hot water of a suitable temperature with a small flow rate. For example, it is possible to expand the hot water supply control range from a large amount of hot water to a small amount of hot water.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a system of an embodiment of an instantaneous water heater of the present invention, FIG. 2 is an explanatory diagram showing an operation of the instantaneous water heater of FIG. 1, and FIG. FIG. 3A is a cross-sectional view showing the configuration of the mixing valve, and FIG. 3B is a longitudinal cross-sectional view showing the operation of the mixing valve. DESCRIPTION OF SYMBOLS 1 ... Hot water path 2 ... Water heater 3 ... Heat exchanger 4 ... Mixing valve 5 ... Water path 6 ... Combiner 7 ... Thermal response element 8 ... Valve element 9 ... Actuator, 10 Bias spring 11 Actuator, 12 Burner 13 Controller 14 Hot water setting device 15 Temperature sensor 16 Water switch 17 Water control valve 18 ... check valve 19 ... tap hole, 20 ... return spring

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Noritaka Morinaka 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture Inside Takagi Sangyo Co., Ltd. (56) References JP-A-63-213747 (JP, A) JP-A-59 JP-A-173652 (JP, A) JP-A-58-205043 (JP, A) JP-A-63-175378 (JP, U) JP-A-1-88215 (JP, U) JP-B-63-27620 (JP, B2) ) Tokiko 1-32899 (JP, B2)

Claims (1)

(57) [Claims] 1. A method according to claim 1, wherein water to be heated is divided into a hot water path provided with a heat exchanger and a water path provided in parallel with the hot water path. A hot water supply mechanism for an instantaneous water heater that mixes water with water from a path to discharge hot water, the burner burning a fuel gas to heat the heat exchanger, and a temperature sensor for detecting a temperature of the hot water on the hot water path side. A valve body for changing a flow ratio of hot water in the hot water path and water in the water path at a junction of the hot water path and the water path, the valve body being connected to the valve body and supported so as to be able to move forward and backward; The valve body is moved by a heat-responsive element that expands or contracts by detecting the temperature of the hot water at the junction, and an actuating body that has acted a bias spring to open the water path side. A return spring for applying a return force opposing the bias spring; Actuating mechanism for controlling the valve body through the body,
A mixing valve having a merging flow path for merging the hot water and the water that have passed through the valve element; a hot water temperature setting device for setting a tapping water temperature in the merging flow passage; On / off control or proportional control of the supply of the combustion gas to the burner according to the temperature and the detected hot water temperature of the temperature sensor, and the operation mechanism is controlled to adjust the position of the valve body, and always adjust the position of the valve hot water. Control means for controlling the detected hot water temperature to be higher than the predetermined hot water temperature by a predetermined temperature from the hot water system side, and water from the water system side. To the mixing valve, by changing the flow rate ratio of the hot water and the water by moving the valve body in the temperature-sensitive operation of the thermo-responsive element, from the combined flow path of the set hot water temperature It is characterized by having a hot spring Hot water supply mechanism of instant water heaters to be.