JPS60207847A - Instantaneous water heater - Google Patents

Abstract

PURPOSE:To enable to accurately control the temperature by removing the effect of the change of combustion rate in the transitional stage by a method wherein the controlled water amount is corrected based upon the temperature of service hot water after the predetermined period of time when the combustion rate of a gas burner has changed. CONSTITUTION:The service hot water temperature detector 23 of the titled instantaneous water heater is provided in a water passage 24 on the downstream of a heat exchanger 1. A correcting means 25 to correct the set capacity of a gas burner 2 based upon the service hot water temperature measured by the temperature detector 23 is set to come into operation after the predetermined period of time since the change of the combustion rate of a gas burner 2. Concretely, the correcting means 25 calculates the actual size number Wo based upon flowing water amount Q measured by a flow detector 6, feed water temperature Tw measured by a feed water temperature detector 8 and the service hot water temperature TH measured by the service hot water temperature detector 23 after the set time (t) since the start of the hot water delivery and, after that, the calculated indication number Wo is substituted with the set capacity W. Thenceforth, the opening of a water control valve 9 is controlled based upon the calculated indication number Wo so as to set the control water amount Q0.

Description

[Detailed description of the invention] The present invention relates to a 1ll1-hour hot water waste device.

In conventional instantaneous water heaters, there is a system in which a gas proportional valve is controlled in accordance with the temperature difference between the two temperatures. However, devices using such gas proportional valves are usually used within a limited gas amount range, and such usage requires consideration of the stable combustion range of the burner.
Therefore, the control device has the drawback of being expensive, and the gas proportional valve itself is also expensive, which poses a problem in terms of product price. I suggested an instant water heater. To explain such an instantaneous water heater, (1) is a heat exchanger, (2) is a gas burner that heats the heat exchanger (1), and the cass burner (2) is composed of a plurality of burner elements (2al (2b), ( 2c) J2d), (2el
The gas passages (3) leading to these burner elements (2a) to (2e) are branched from the downstream side of the former solenoid valve (4), and the respective branch gas passages (3a), (3b), (3cl
, (3dl.

(3e) has 1am valves (5a), (5b), (5c),
(5 dl, (5 el) are installed. (6) is the water flow sensor (set number 7) leading to the heat exchanger (1), (8
) is the feed water temperature detector. (9) is a water control valve controlled by a controller to be described later. (10) is a hot water tap. (11) is a remote control device installed in an easily used place such as the kitchen. 13) An operation switch (14) is provided. (15) is control! I'm sorry.

Next, the schematic structure of the above-mentioned controller a will be explained based on FIG.
Part (16) shows the temperature of the water supply, and the temperature of the water supply from the vessel (8) (T
WI, water flows from the detector (6) ffl (Q),
The setting capacity signal and the setting temperature ('
r o ) is input. The ability setting device (12) is g! By switching the control from position [a] to position (e), the number of combustion pieces in the burner regulator is switched from five to one, and at the same time, the calculation control section 11 (16) is used to control the number of combustion pieces in accordance with the number of combustion pieces. A quantity signal (hereinafter referred to as setting capacity (w)) is output.

By the way, in an instantaneous water heater, the capacity No. 1 is 11 per minute.
of water by 25℃, and therefore the number (WO
), water flow It (Q), set temperature (To), and water supply temperature (
The relationship with Tw) is as shown in the following equation.

WO=Q (TCI-TV) /25 Also, the combustion amount of the gas burner has a relationship that roughly corresponds to the number.
By switching the number of combustion gas burners (2), the number of burners can also be switched in accordance with the above switching.

In the calculation control section a (16), the set temperature (T
The control water amount (Qo) that can be heated to
W/ (To -TV) (!: Then calculate shi, ko (7
) performance) H1ii'i- is output to the servo circuit (17), and the servo circuit (17) operates the servo motor (1) so that the detected water amount from the water amount detector (6) matches the calculation input.
8) to control the opening degree of the water control valve (9), that is, to control the amount of water flowing.

In the above configuration, first turn on the operation switch (14) of the remote control r, 4 (]], ), then open the hot water tap (10) to start water flow, and set it on the calculation side a section (16). Capacity (W), set temperature (Tol supply water temperature (Tw), water flow rate (Q)
) is input, and the water flow 11 is inputted in the arithmetic control unit (16).
When (Q) reaches the minimum operating water amount, the combustion control circuit (22)
No. 42 is sent to start combustion, and as described above, the control water 171 (Q) is calculated and the water control valve (9) is controlled to adjust the amount of water flowing, and hot water is discharged at the set temperature. Also same-out @
If you want to change the amount of hot water depending on the temperature, use the remote controller (
Switching the capacity setting #11) + 12) to large 4\ is the calculation control I! as described above. Since the control water fit (Q) calculated in the first part (16) changes in accordance with the above switching operation, the amount of hot water dispensed from the spacing wheel can be changed.

Also, as mentioned above, the amount of waste can be controlled by installing a capacity setting device (12) on the car.
) is configured to open and close magnetic valves (5a) to (5e) to control the number of burning purple sweet potatoes in the burner,
Compared to the conventional gas proportional valve system that throttles and controls the gas amount, there is no need to set a limit on the throttle range, so the controller configuration becomes an intermittent, and an expensive gas proportional valve is not required, so it can be used instantly. Water heaters can be provided at low cost.

By the way, as mentioned above, there is a relationship that roughly corresponds to the smoldering Nii of the gas burner and No. 1 number, but due to variations in the input when setting the secondary pressure and variations in the efficiency of the heat exchange zone, the combustion amount of the gas burner is determined as described above. If it is set uniquely as a number, the amount of water to be controlled will be different for each appliance, even if the setting is the same, and the level of flow of hot water will also be different.

The present invention is intended to solve the above-mentioned problems, and will be specifically explained below based on an embodiment shown in the drawings. Components having the same configuration as those of the conventional example are given the same numerals and their explanations will be omitted.

(23) is a hot water temperature detector installed in the water channel (24) downstream of the heat exchanger (1). (25) is means for correcting the set capacity based on the hot water supply temperature from the hot water supply temperature detector (23).

This correction means (25) is designed to operate at the start of tapping and when the set capacity changes, that is, after a set time when the combustion section of the gas burner (2) changes.

This set time (1) is t-heat exchanger ffi (1)
/water flow rate (J/+n1n), it is possible to eliminate the influence of the transition period of flow rate and combustion rate change, and accurate temperature control can be performed.

In the above configuration, the start of hot water dispensing can be performed in the same manner as in the conventional example, and when the set time (11
The correction means (25) adjusts the actual number (WO) according to the water supply temperature (Twx water flow rate (Q) from the flow detection function (6)).
Calculate Wo = QX (TI4-1'w) / 25, and calculate the calculated number (Wo) with the setting ability (W) and 1
After that, the opening degree of the water control valve (9) is controlled based on the number (Wo) calculated above.
/ ('ro-Tw) =QX(TN Tw) / (
To-Tw).

Furthermore, when the set capacity is changed at the time of entry, the above-mentioned calculation number is cleared and the above-mentioned calculation is performed after the set time to control the water control valve (9).

As explained above, in short, according to the present invention, even if there are variations in the efficiency of the input and the heat exchanger, the actual number is calculated after a set time and the water control valve is operated based on the calculated number. Since it is controlled, it is possible to prevent deviation from the set temperature due to the above-mentioned variations, and therefore it is possible to provide an instantaneous water heater with good hot water dispensing characteristics and at an extremely low cost.

[Brief explanation of the drawing]

Figure 1 is the overall configuration of a conventional instantaneous water heater, and Figure 2 is the same!
FIG. 3 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 4 is an electrical circuit diagram of the controller. (11... Heat exchanger (2)... Gas burner (6)... Water quantity detector (8) - Feed water temperature detector (9)... Water control valve (12)... Capacity setting device (13) )...Temperature setting device (15)...Controller (23)...Hot water supply temperature detector (24)...Waterway (25)...Means Figure 3, 23

Claims (1)

[Claims] A heat exchanger, a gas burner that heats the heat exchanger, a water control valve, a capacity setting device that varies the combustion amount of the gas burner, and the ability to set the feed water temperature from the feed water temperature detector, the set temperature, and the capacity setting device. and a controller that calculates the amount of water to be controlled based on the calculation output, and the water control valve is controlled by the calculation output, and a hot water temperature detector is provided in the water channel downstream of the heat exchanger, An instantaneous anchorage gear comprising means for correcting the control water amount based on the supply m lagoon from the detector after the elapse of a set time during which the combustion amount has changed.