JPS6210561A - Hot water supply control system - Google Patents

Abstract

PURPOSE:To reduce the pressure loss in the feed water piping of the hot water supply system and stabilize the hot water temperature by controlling the heating controller as well as the amount of opening of the bypass control valve by the signal from the hot water temperature regulator. CONSTITUTION:When the hot water temperature is set at a relatively low temperature by the hot water temperature regulator 29, the movable valve plate 15 rotates to cause a communication between the bypass control valve 14 and the communication channel 16a to allow a bypass flow. When the hot water temperature is set at a relatively high temperature, on the other hand, the communication between the bypass control valve 14 and the communication channels 16a, 16b is interrupted, prohibiting the bypass flow. That is, when the hot water temperature setting is high, there will be no boiling in the heat exchanger 23 because the ratio of the bypass water quantity is small, and most of the total feed water quantity passes through the heat exchanger 23. When the temperature setting is low, the ratio of the bypass water quantity becomes greater and bypasses the heat exchanger 23 which causes a high pressure loss so that a large amount of water may be supplied even if the feed water pressure is low.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to water flow control for instantaneous water heaters.

BACKGROUND OF THE INVENTION Conventional instantaneous hot water heaters are known to detect the temperature of hot water and control the amount of heating. In addition, there is a bypass water circuit system that has a bypass path that bypasses a heat exchanger for the purpose of reducing the pressure loss of flowing water, and mixes with the field heated by the heat exchanger to supply hot water. Bypass water circuit systems include a fixed bypass ratio type that maintains a constant ratio of bypass water volume to total water supply volume;
There is a bypass ratio changing type that increases the ratio of bypass water volume as the total water supply volume increases.

Problems to be Solved by the Invention However, when the bypass water circuit system is used in the above-described hot water temperature control type water heater, the following problems arise. In other words, the fixed bypass ratio type has the drawback that if the bypass ratio is increased, boiling occurs in the heat exchanger when the set value of the outlet temperature is high, and if the bypass ratio is decreased, the effect of reducing pressure loss is lost. The above-mentioned disadvantages do not occur with the variable bypass ratio type, but since the bypass ratio also changes when the total amount of water supplied changes, the hot water temperature fluctuates transiently in response to sudden changes in the total amount of water supplied, such as when the user suddenly opens the faucet. There was a drawback to that.

The present invention is intended to solve these conventional problems, and aims to reduce pressure loss in the water supply circuit of a water heater and stabilize the temperature of hot water.

Means for Solving the Problems In order to solve the above problems, the hot water supply control device of the present invention includes:
A heat exchanger, a heating device for this heat exchanger, a heating controller for this heating device, a main control valve that controls the total water supply amount, and a bypass control valve provided in a passage that bypasses the heat exchanger. , a driving device for operating the main control valve and the bypass control valve, and a signal from the outlet hot water temperature setting device to control the heating controller and to control the opening degree of the bypass control valve.

Effect of the Invention With the above-described configuration, the present invention increases the opening degree of the bypass control valve when the set value of the hot water temperature setting device is relatively low to obtain a large amount of water with low pressure loss, and when the set value of the hot water temperature setting device is relatively high, the bypass control valve is increased. This prevents boiling by reducing the opening degree of the control valve.

EXAMPLE A hot water supply control device which is an example of the present invention will be described below based on the accompanying drawings. In Fig. 1, reference numeral 1 denotes a valve body through which inflow flows from an inlet section 2, a main outlet section 3 a, and a bypass outlet section 3.
It flows out from b. The inlet portion 2 enters the vortex chamber 4 having a circular cross section from the tangential direction, and the vortex flow generated within the vortex chamber 4 causes the sphere 4 to flow into the inlet portion 2 .
a rotates within the vortex chamber 4. 5 is a rotation detector consisting of a magnetic sensor or an optical sensor. The vortex chamber 4, the sphere 4a, and the rotation detector 5 constitute a water amount detector 6. A support body 7 is integrally attached to the valve body 1 and has an inlet part 8, an outlet part 9, and a bypass part 10, and has elastic bodies 9a and 9a, respectively.
, 10a are provided. A fixed valve plate 1 is mounted on the support 7.
1 are integrally attached, and the fixed valve plate 11 has a main control valve 12, an outlet hole 13, and a bypass control valve 14 corresponding to the inlet part 8, outlet part 9, and bypass part 10 of the support body 7, respectively. There is a movable valve plate 15 on the fixed valve plate 11, and communication grooves 16 are provided at positions corresponding to the main control valve 12, the outlet hole 13, and the bypass control valve 14 of the fixed valve plate 11. As shown in FIGS. 2A and 2H, it consists of a first communication groove 16a that communicates with the bypass control valve 14 and a second communication groove 16b that closes the bypass control valve 14. The rotation of the movable valve plate 15 changes the fluid resistance at the main control valve 12. The movable valve plate 15 can be rotated by a rotating body 17, and the rotating body 17 is operated by a drive device 20 consisting of a motor 18 and a gear box 19.

21 and 22 are switches for detecting the position of the rotating body 18, respectively. Water flows in two directions through the communication hole 16, one flowing from the main outlet 3a to the heat exchanger 23, and the other flowing from the bypass outlet 3b to the bypass path 24, and flowing into the heat exchanger 2.
It merges with the tapping pipe 25 of No. 3 at the mixing part 25a. An inlet water temperature detector 26 is provided upstream of the valve body, and an outlet water temperature detector 27 is provided in the mixing section 25a. The amount of gas is adjusted from the gas supply path 28 by a heating controller 29, and is combusted by a heating device 30 to heat the heat exchanger 23.

31 is a hot water temperature setting device composed of a variable resistor and the like. 32 is a hot water supply controller consisting of a microprocessor, etc., which inputs signals from the water amount detector 7, inlet water temperature detector 26, outlet water temperature detector 27, and switches 21 and 22, performs arithmetic processing, and then outputs signals from the drive device 20. ．． A signal is output to the heating controller 29.

Next, the operation will be explained. In FIG. 1, when the power is turned on, the signal from the hot water temperature setting device 31 is read, the drive device 20 is operated according to the hot water temperature setting, and the switch 21 is activated.
The rotating body 17 is rotated until the position is detected at . After that, when the faucet is opened by the user and water starts flowing,
The signal from the water amount detector 6 is read, fuel is supplied to the heating device 30, and combustion begins. The mixed hot water temperature of the hot water heated by the heat exchanger 23 and the water passing through the bypass path 24 is detected by the hot water outlet temperature detector 27, and this signal and the hot water outlet temperature setting device 3 are detected.
The heating controller 29 is driven by the signal No. 1, and adjusts the heating amount of the heating device 30. Further, the drive device 20 is finely adjusted by the signal from the water amount detector 6 to control the total water supply amount.

Next, the control operation will be explained in more detail with reference to FIGS. 2 and 3. When the power is turned on and the user sets the dejima temperature, the signal from the hot water temperature setting device 31 is read into the hot water supply controller 32, and is calculated by the bypass calculation section 32a inside the hot water supply controller 32, according to the hot water temperature setting. Drive device 2
0 is driven, and the movable valve plate 15 rotates by a predetermined angle.

When the outlet temperature of the outlet hot water temperature setter 29 is set relatively low, the movable valve plate 15 rotates to the position shown in FIG. 2A, and the bypass control valve 14 and the communication groove H5m communicate with each other.
Bypass flow flows. On the other hand, when the hot water temperature is set relatively low, the bypass control valve 14 is closed as shown in FIG. 2B.
Both the communication grooves 16a and jab are blocked, and the bypass flow does not flow. In other words, when the hot water temperature setting is high, the proportion of the bypass water volume is small and most of the total water supply is from the heat exchanger 23.
Because it passes through the heat exchanger 23, it does not boil in the heat exchanger 23, and when the temperature setting is low, the proportion of bypass water increases, and by bypassing the heat exchanger 23, which has a high pressure loss, a large amount of water can be saved even when the water supply pressure is low. Can be supplied.

Further, the water amount setting calculation unit 32b of the hot water supply controller 32 calculates the signal difference between the hot water temperature setting device 31 and the incoming water temperature detector 26 and the heating capacity of the heating device 30, and calculates the heating capacity of the heating device 30.
Set the maximum amount of water that guarantees the hot water temperature set in step 1. After that, when the water flow is started, the water amount detector 6 detects the water supply amount, and when the water supply amount reaches the ignition start water amount or more, fuel is supplied to the heating device 30 and an ignition operation is performed to start the heating device 3.
0 combustion begins. When the water supply pressure is high and a large amount of water is supplied, the deviation between the signal from the water amount detector 6 and the signal from the water amount setting calculation section 32b described above is calculated by the water amount control calculation section 32c, and the drive device 20 is driven. The main control valve 12 controls the amount of water by rotating the movable valve plate 15. At this time, the opening degree of the bypass control valve 14 does not change. The heating amount of heating device 30 is adjusted by heating controller 29 . Heating controller 29
is controlled by the heating load value calculated in the hot water temperature control calculation @32d based on the difference between the signal from the hot water outlet temperature setting device 31 and the signal from the incoming water temperature detector 26 and the signal from the water flow rate detector 6. It is corrected by the deviation signal between the device 31 and the hot water temperature detector 27, and finally the hot water temperature equal to the hot water temperature setting is obtained.

The timer 32e of the hot water supply controller 32 measures the time elapsed since the signal from the water amount detector 6 reached the above-mentioned ignition start water amount or less. In other words, it measures the time that has passed since hot water supply was stopped,
The opening degree of the bypass control valve 14 is corrected depending on the magnitude of the value. The opening degree of the bypass control valve 14 is set to be smaller than the normal setting value when resupplying hot water after a long period of time has passed after stopping the hot water supply, and the opening degree is set to be larger than the set value when resupplying hot water within a short time. When resupplying hot water after a long time has passed after the hot water supply is stopped, including during initial use, a bypass water amount is supplied smaller than the open setting value within a predetermined time, thereby improving the delay in rising hot water temperature caused by the heat capacity of the cooled heat exchanger 23. do. In addition, when hot water is re-supplied within a short time after hot water supply is stopped, a bypass water volume larger than the open setting value within a predetermined time is supplied to improve the transient rise in the outlet temperature caused by the heat capacity of the heated heat exchanger 23. do.

In the embodiment of the present invention, one bypass control valve 14 is shown, but it is also possible to provide a plurality of bypass control valves on the fixed valve plate 11 to perform multi-stage switching.

Effects of the Invention As described above, the hot water supply control device of the present invention includes a heat exchanger, a heating device for the heat exchanger, a heating controller for the heating device, a main control valve that controls the total water supply amount, and a heat exchanger. A bypass control valve provided in the bypass passage, a drive device that operates the main control valve and the bypass control valve, and a signal from the hot water temperature setting device to control the heating controller and the opening degree of the bypass control valve. Since the configuration includes hot water supply control, the following effects can be obtained.

(1) When the hot water outlet temperature setting is high, most of the total water supply is passed through the heat exchanger, so there is no risk of boiling, and bypass water flow control is performed immediately after the hot water outlet temperature is set, so for example, heat exchange Compared to methods that detect boiling at the outlet of the vessel by temperature, there is no detection delay and it is highly safe.

(2) When setting a low hot water temperature that allows a large amount of water to be supplied, only the amount of bypass water increases and the pressure loss in the heat exchanger does not increase, so a large amount of hot water can be discharged at a low water supply pressure.

(3) The amount of water supplied to the heat exchanger and bypass does not change due to sudden opening/closing of faucets or sudden fluctuations in water supply pressure, so transient fluctuations in hot water temperature are small.

(The four main control valves and bypass control valves can be operated by one drive device, making it small and inexpensive.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a hot water supply control device showing an embodiment of the present invention, Fig. 2 A, B, C, and D are a front view and a cross-sectional view respectively illustrating the water flow control operation of the same device, and Fig. 3 is a block diagram showing control signals of the device. 11... Fixed valve plate, 12... Main control valve, 14... Bypass control valve, 15...
Movable valve plate, 20... Drive device, 23...
・Heat exchanger, 29... Heating controller, aO...
... Heating device, al... Hot water temperature setting device, 3
2...Hot water controller. Name of agent: Patent attorney Toshio Nakao and 1 other person11
, Fixed A slope) 5... Possible U valve handling 2θ... Bird Iσ device Fig. 2

Claims (3)

[Claims] (1) A heat exchanger, a heating device for the heat exchanger, a heating controller for the heating device, a main control valve that controls the total amount of water supplied, and a passage that bypasses the heat exchanger. a bypass control valve; a drive device that operates the main control valve and the bypass control valve; and a hot water controller that controls the heating controller and the opening degree of the bypass control valve based on a signal from a hot water temperature setting device. A hot water supply control device with (2) The main control valve and the bypass control valve consist of a fixed valve plate and a movable valve plate provided with communication holes corresponding to the inlet and outlet holes of the fixed valve plate or the bypass hole, and drive the movable valve plate. The hot water supply control device according to claim 1, which is operated by the device. (3) The hot water supply control device according to claim 1, wherein the opening degree of the bypass valve is increased when the hot water outlet temperature setting value is low, and the bypass valve opening degree is decreased when the setting value is high.