JPH01118071A - Controller for hot water supplying device - Google Patents

Abstract

PURPOSE:To enable a rapid detection of a position of a valve and make a positive control of a degree of opening of a water rate controlling valve is controlled for its driving within a range where a resistor part of a sliding surface shows a variation. CONSTITUTION:A variable resistor 80 may set an electricaly effective angle S within a range from a rotating angle B to a rotating angle C in such a way as a rotational angle can be detected without fail even if a valve body of a water rate controlling valve is positioned at any part of its rotatable range. The valve body is rotated only within this electrical effective angle S. With this arrangement, even if the valve body is placed at any position, the sliding body 84 is brought into contact with only the resistor 83 without fail and not brought into contact with either a lead terminal 81 or a lead terminal 82. A rotational position of the valve body of a water amount controlling valve can be specified by a resistance value indicated by a variable resistor 80. In case that a set water temperature is varied, the water rate controlling valve 33 is merely rotated in reference to a resistance value indicated by the variable resistor 80 so as to enable the temperature to be positively set at the set water temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a water heater that changes the temperature of hot water by adjusting the amount of water flowing into a heat exchanger using a water flow SW valve. .

[Prior art] The temperature of hot water supplied by a water heater can be controlled to a set water temperature by changing the amount of heating depending on the amount of water flowing in, or if the amount of heating is constant, by changing the amount of water. The water temperature is controlled according to each water heater.

In the water heater, by further combining these, in order to control the set temperature even when the set water temperature is set to the maximum temperature, the amount of heating and water amount is controlled based on the amount of hot water supply at the time of starting hot water supply, After that, 1. The hot water temperature is changed by changing the amount of water using the water amount control valve.

At this time, the method of detecting the changed water amount is to calculate the water flow amount by detecting the water amount and the rotation angle of the water flow control valve in advance when hot water supply starts, and then use the resistance value of the potentiometer as a position signal. There is a method of reading the information, detecting the rotation angle of the water flow control valve, and converting the water flow amount.

[Problems to be solved by the invention] This method eliminates the need for extra processing such as converting the signal from the water flow sensor to detect the water flow when changing settings, but the rotation angle of the water flow control valve It is necessary to match the characteristics of the potentiometer.

However, the variable resistor used as a potentiometer to detect the rotation angle of the water flow control valve comes into contact with the lead terminal 81 when the sliding body 84 reaches its maximum displacement as shown by the chain line in FIG. The resistance value between the terminal 85 connected to the sliding body 84 and the lead terminal 81 and the rotation angle of the sliding body 84 are as follows. As shown in the figure, the rotation angle is not necessarily proportional within the rotation range; in other words, when the rotation angle of the sliding body 84 is 0° and when it is Ao, it shows the same O [Ω], and when the rotation angle is Ao There is a proportional relationship only between and Do. Therefore, if this variable resistor 80 is rotated through its entire rotatable angle from 0° to Eo, a resistance value proportional to the rotation angle cannot be obtained, and the valve of the water flow control valve 33 is There is a problem in that it is not possible to detect which degree of opening the body is showing.

An object of the present invention is to reliably control the rotation angle of a water flow control valve control device using a variable resistor as a rotation angle detection means of the water flow control valve.

[Means for Solving the Problems] The present invention includes a heat exchanger through which water passes, and a rotating valve body, and the amount of water flowing into the heat exchanger is controlled depending on the rotating state of the valve body. a water amount control valve to be adjusted; a water amount detection means for detecting the amount of water flowing into the heat exchanger; an incoming water temperature detection means for detecting the temperature of the water flowing into the heat exchanger; and heating water passing through the heat exchanger. a heating means for detecting the rotation angle of the valve body, a sliding body that is provided to detect the rotation angle of the valve body and that is integrally displaced according to the rotation angle of the valve body, and a slide on which the sliding body slides. a moving surface, a position detecting means comprising a resistor provided on the sliding surface within a displacement range of the sliding body and indicating a resistance value according to a displacement position of the sliding body; and water flowing out from the heat exchanger. water temperature setting means for setting the temperature of the water, the amount of water detected by the water amount detection means, the water temperature by the input water temperature detection means, the heating amount of the heating means, and the setting state of the position detection means and the water temperature setting means. A water heater control device comprising a control means for driving and controlling the water flow rate control valve and changing a rotation angle of the valve body according to a change in a setting state of the water temperature setting means, wherein the control means is configured to control the water flow rate control valve. The technical means is to drive and control the water flow control valve only within a range in which a moving body displaces the resistor portion of the sliding surface.

[Function] In the water heater of the present invention, the amount of water detected by the water amount detection means,
The water flow control valve is driven and controlled based on the water temperature detected by the inlet water temperature detection means, the heating amount of the heating means, and the setting state of the water temperature setting means. Further, in the water flow control valve, when the setting state of the water temperature setting means changes, the rotation angle of the valve body is changed in accordance with the change. When the valve body rotates, in the position detection means for detecting the rotation angle, the sliding body is integrally displaced according to the rotation angle of the valve body. At this time, the sliding body displaces only the portion of the sliding surface where the resistor is provided. Therefore, no matter what position the valve body is rotated to, the sliding body always comes into contact with the resistor.

[Effects of the Invention] In the present invention, when the valve body of the water flow control valve rotates, the sliding body of the position detection means is always in contact with the resistor. Therefore,
Even if the setting state by the water temperature setting means is changed and the rotation angle of the water flow control valve is changed, the position of the valve body can be detected immediately, so the opening degree of the water flow control valve can be reliably controlled. .

[Example] Next, the present invention will be explained based on embodiments shown in the drawings.

A combustor gas 10 is provided in the water heater case 2 of the gas combustion type water heater 1 shown in FIG.
A linked burner 11 is provided. Further, the combustor case 10 is equipped with a combustion fan 12 using a three-phase Y-connected brushless DC motor, and the burner 11 is a heating means of the present invention that performs combustion using combustion air supplied by the combustion fan 12. The combustion exhaust gas is exhausted to the outside from the exhaust port 3.

A heat exchanger 13 connected to a water supply pipe 30 is provided above the combustor case 10 , and water passing through the interior is heated by heat generated by the burner 11 .

Further, in the vicinity of the burner 11 in the combustor case 10, a sparker 14 as an ignition device and a flame rod 15 as a flame detection means are provided.

The gas supply pipe 20 includes, from its upstream side, a source solenoid valve 21 that allows fuel gas to pass through when energized, a main solenoid valve 22, and a governor proportional valve 23.2 that adjusts the amount of fuel gas supplied by controlling the supply pressure. A switching electromagnetic valve 24 is provided to cut off fuel gas to one of the linked burners 11 depending on the state of use, and supplies fuel gas to the burner 11 described above.

A water drain valve 32 equipped with a water filter 31 is provided at the most upstream part of the water supply pipe 30, and downstream thereof is a water flow control valve driven by a geared motor that adjusts the amount of water flowing into the heat exchanger 13. 33 are provided. Water! IIe valve 33
The inflow amount is adjusted according to the rotation angle of a valve body (not shown), and in this embodiment, the rotation angle of the valve body of this water flow control valve 33 and the outlet temperature are as shown in the third section. There is a proportional relationship. As a result, when the set water temperature is changed by each controller, the water outlet temperature can be quickly changed to the set water temperature by rotating the rotation angle of the water flow control valve 33 by the rotation angle corresponding to the set water temperature. Can be done.

Note that FIG. 3 shows an example when the burner 11 is at maximum combustion, and its characteristics vary depending on other factors such as the inlet water temperature.

This water flow control valve 33 is equipped with a potentiometer 34 that rotates integrally with the valve body to detect the degree of opening.

The potentiometer 34 is the position detection means of the present invention,
In this embodiment, a variable resistor 80 as shown in FIG. 4 is particularly used. This variable resistor 80 has a lead terminal 81
A resistor 8 is placed on the sliding surface (not shown) between the lead terminal 82 and the lead terminal 82.
3, and a sliding body 84 slides on this sliding surface. Then, when the sliding body 84 slides on the sliding surface,
Between the lead terminal 81 or the lead terminal 82 and the terminal 85, a resistance value is shown depending on the rotation angle of the sliding body 84.
This terminal 85 is electrically connected to the sliding body 84, and the sliding body 84 rotates together with the valve body of the water flow control valve 33.

As already mentioned, the opening degree of the water flow control valve 33 is changed so that the rotation angle of the valve body and the hot water temperature show a proportional relationship, so the rotation angle of the water flow control valve 33 is simply changed according to the set temperature. You can change the hot water temperature by simply changing it.

However, this variable resistor 80 does not exhibit a resistance value depending on the rotation angle as described in the prior art.

Therefore, in this embodiment, even if the valve body of the water flow control valve 33 rotates to a rotation position within its movable range, the rotation angle can be detected without fail, as shown in FIG. An electrically effective angle S is set in the range from a rotation angle B to a rotation angle C shown in , and the valve body is rotated only within this electrically effective angle S.

As a result, even if the valve body is in the rotational position, the sliding body 8
4 always contacts only the resistor 83 and never contacts the lead terminal 81 or the lead terminal 82.

Therefore, the rotational position of the valve body of the water flow control valve 33 can be determined without fail by the resistance value shown by the variable resistor 80, and conversely, the valve body can be rotated to the position where the variable resistor 80 shows a predetermined resistance value. If it is moved, the water i#;IN control valve 33 will open according to its resistance value.

The temperature of the water whose inflow amount has been adjusted by the water amount control valve 33 is detected by an incoming water temperature thermistor 35 as an incoming water temperature detection means of the present invention provided immediately downstream, and the water amount of the present invention provided immediately downstream. Water amount sensor 3 as a detection means
The inflow amount is detected by 6 and sent to the heat exchanger 13 through the water supply pipe 30 .

The water supply pipe 30 on the downstream side of the heat exchanger 13 is provided with a hot water outlet temperature thermistor 38 that detects the temperature of the heated water.

In the gas combustion water heater having the above configuration, the control device 50
mm.

As shown in the first section, the control device 50 includes a heating and cooling circuit 52 consisting of a freeze prevention heater 40 connected via a low temperature sensing switch 41 to a power cord 51 connected to an outlet T of indoor wiring; It is composed of a control circuit 60 provided in parallel with this heater circuit 52, and the control circuit 60 is
It is operated by a power supply section 53 connected via an embers safety switch 37, a temperature fuse 16, and a boil prevention switch 39, and a main controller 54 and a sub-controller 54 are included in the control device 50 to operate the gas combustion water heater 1.
A is provided.

Main controller 54 and sub controller 54a
1 is the water temperature setting means of the present invention, and is provided with an operation switch (not shown), an indicator lamp indicating that the operation is in progress using the operation switch, and a water temperature setting switch for setting the water temperature.

The control circuit 60 is of the present invention! II control means, and the control circuit 60 includes a microcomputer 70 (hereinafter referred to as CPU70).
), there are a sparker circuit 61, a fan circuit 62, a proportional valve circuit 63, a geared motor circuit 64, a position detection surface FI@65, and a water amount detection circuit 66, and these circuits are controlled in a predetermined manner by the CPU 70. be exposed.

The fan circuit 62 rotates the combustion fan 12 according to the required combustion amount such as a set water temperature, detects the rotation speed using a Hall IC provided in a three-phase Y-connected brushless DC motor, and sends a detection signal to the CPU 70. send to

The proportional valve circuit 63 is a circuit that controls the amount of electricity supplied to the governor proportional valve 23 in order to adjust the amount of fuel gas supplied so that combustion in the burner 11 is performed at a desired air-fuel ratio. The amount of current is determined in ms based on the rotational speed of the combustion fan 12 except during ignition.

The geared motor circuit 64 is a circuit that drives a geared motor of the water flow control valve 33 for regulating the flow of water into the heat exchanger 13, and opens the water flow control valve 33 according to a control signal.

The position detection circuit 65 is a circuit for analyzing the rotation angle of the valve body based on the resistance value of the potentiometer 34 provided in the water flow control valve 33 to detect its opening degree.
In particular, in this embodiment, only the electrically effective portion of the entire rotation angle of the potentiometer 34 in which a change in rotation appears as a change in resistance value is used, and the detected resistance value is read as it is as a rotation angle for accuracy. They are doing YGM.

The water amount detection circuit 66 detects the amount of water entering based on the rotation speed of the water amount sensor 36.

The CPU 70 determines the combustion amount and the amount of water input based on the setting states of the main controller 54 and the sub-controller 54a, the inlet water temperature, the inlet water amount, and the outlet water temperature. IN control.

When the user uses water and obtains a water flow signal based on the water amount sensor 36, energization of each circuit is started in a predetermined order, and then the capacity of the combustion amount is calculated, and the combustion begins.

Furthermore, in this embodiment, even when the water temperature setting is changed, the amount of water flowing into the heat exchanger 13 at the beginning of use, the water temperature set by each controller, and the temperature of water flowing into the heat exchanger 13 is The amount of water supplied is adjusted by driving the water amount control valve 33 so that the water can be heated to that temperature.

There is a limit to the water temperature that can be heated by the heating capacity of the burner 11, and if an amount of water that exceeds this heating capacity is supplied, the amount of heat generated by combustion in the burner 11 will increase when the set water temperature is set to the maximum. Therefore, in order to always reach the set water temperature even when the set water temperature is set to the maximum, it is necessary to limit the amount of hot water supplied. Based on the inlet water temperature at the start of hot water supply and the heating capacity of the burner 11, the amount of water that can be supplied even when the set temperature is set to the maximum temperature is calculated, and the water flow control valve 33 is rotated based on the calculated water amount and the set water temperature. If the angle is adjusted and the set water temperature is changed, the water flow control valve 3
The rotation angle of 3 has been changed.

The gas combustion water heater 1 having the above configuration operates as follows.

When the user closes a power switch (not shown), sets the water temperature using the controller, and turns on the operation switch, the control circuit is activated. Furthermore, when starting hot water supply, the water flow sensor 3
The CPU 70 starts control based on the signal from 6.

First, based on the inlet water temperature detected by the water temperature thermistor 35 and the heating capacity of this water heater, even if the maximum set temperature is set, simply by changing the rotation angle of the water flow control valve 33. The amount of water that can be heated to the set temperature is calculated, and the water amount control valve 33 is driven and controlled based on the calculated value. The rotation angle of the water flow control valve 33 at this time is read by the resistance value of the variable resistor 80 used as the potentiometer 34.

If the set water temperature is changed after that, the amount of water will change according to the set water temperature! The amount of water is changed by changing the opening degree of the l'I control valve 33. The amount of water to be changed at this time must be the amount of water that can reach the set water temperature, but since the rotation angle of the water amount control valve 33 has a proportional relationship with the set water temperature, simply change the rotation angle. By detecting this and changing the amount of water, you can obtain water at the set water temperature.

When the valve body of the water flow control valve 33 rotates, the sliding body 84 of the variable resistor 80 always rotates only the resistor 83 portion of the sliding surface, and the valve body rotates only within this range. Since the water flow control valve 33 is driven, the rotational position of the water flow control valve 33 is always detected regardless of the opening degree of the water flow control valve 33. Therefore, when the set water temperature is changed, the variable resistor 80
By simply rotating the water volume control button *33 based on the resistance value indicated by the water temperature, the set water temperature can be easily and reliably reached.

As mentioned above, in a water heater that changes the amount of water depending on the set water temperature, water! The opening degree of the i-control valve 33 can be changed reliably.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the control device of this embodiment, Fig. 2 is a schematic configuration Z showing the gas combustion type water heater of this embodiment, and Fig. 3
The figure is a graph showing the heating characteristics of a gas combustion water heater with respect to the water flow @ control valve of this embodiment, the 4th section is a schematic configuration diagram showing the variable resistor of this embodiment, and the 5th figure is a graph showing the variable resistor of this embodiment This is a characteristic section that shows the resistance value change of the device. In the figure, 11... Burner (heating means), 13... Heat exchanger, 33... Water flow control valve, 35... Incoming water temperature thermistor (incoming water temperature detection means), 34... Potentiometer (position detection means), 54.54a... main controller, sub-controller (water temperature setting means), 60...
Control circuit (III control means).

Claims (1)

[Scope of Claims] 1) A heat exchanger through which water passes; and a water flow control valve that includes a rotating valve body and adjusts the amount of water flowing into the heat exchanger according to the rotational state of the valve body. , water amount detection means for detecting the amount of water flowing into the heat exchanger; incoming water temperature detection means for detecting the temperature of water flowing into the heat exchanger; and heating means for heating the water passing through the heat exchanger. , a sliding body provided to detect the rotation angle of the valve body and integrally displaced according to the rotation angle of the valve body, a sliding surface on which the sliding body slides, and the sliding body position detecting means comprising a resistor provided on the sliding surface within a displacement range of and indicating a resistance value according to the displacement position of the sliding body; and a water temperature for setting the temperature of water flowing out from the heat exchanger. a setting means; driving the water amount control valve based on the water amount detected by the water amount detection means, the water temperature by the water input temperature detection means, the amount of heating by the heating means, and the setting states of the position detection means and the water temperature setting means; and a control means for changing the rotation angle of the valve body according to a change in the setting state of the water temperature setting means, wherein the control means is configured such that the sliding body is aligned with the sliding surface. A control device for a water heater, characterized in that the water flow control valve is driven and controlled only within a range in which the resistor portion of the water heater is displaced.