KR940011226B1 - Controller for hot water feeder - Google Patents

Abstract

The controller, used for the warm water supplier or a bathe boiler, determines a heating quantity based on signals of a flow sensor generating pulses according to the flow rate in a heat exchanger, and definitely ignites a burner when the flow quantity is small at the initial state of supplying water. The controller comprises a flow sensor generating the pulses whenever a predefined quantity of flow passes; a frequency measurement means measuring pulse occurrence intervals; a memory sequentially memorizing the pulse occurrence intervals; a means calculating the average value of the measured frequency intervals; a means calculating the flow quantity based on the calculated average value.

Description

Control device of hot water heater

1 is a functional block diagram showing a control device of a gas water heater showing an embodiment of the present invention.

2 is a schematic view showing the configuration of the gas water heater of this embodiment.

3 is a flowchart showing information processing on the flow rate in the data processing section of this embodiment.

4 and 5 are area diagrams showing the storage state of the periodic information in the data processing section of this embodiment.

6 is a time chart for explaining the operation of the gas water heater in the present embodiment.

* Explanation of symbols for main parts of the drawings

1: gas water heater (hot water heater) 12: combustor (heating means)

30: heat exchanger 31: water supply pipe (water channel)

33: flow sensor 40: control device

41: data processing unit (main machine side, periodic information storage, average main machine exit, flow rate calculation)

The present invention provides a hot water heater for controlling heating means based on a pulse signal from a flow sensor that generates a pulse in accordance with a flow rate through a channel including a heat exchanger, an automatic bath boiler with a water supply function of hot water, and the like. It relates to a temperature control device.

In the case of operating heating means such as a burner based on the flow rate passing through the heat exchanger, conventionally, as described in Japanese Patent Application Laid-Open No. 1-14498 (Japanese Patent Publication No. 89), for example, A flow rate sensor is formed which generates pulse signals according to the flow rate, and when the number of pulse signals from the flow rate sensor per unit time becomes more than a predetermined number, it detects that the predetermined flow rate or more is exceeded, and the ignition operation of the burner is performed. The heating is started and, on the contrary, the number of pulse signals per unit time is less than or equal to the predetermined number, thereby detecting that the flow rate is less than or equal to the predetermined flow rate and extinguishing. However, since the flow sensor rotates the fan by the flow of water and generates a pulse signal according to the rotational speed, a stable pulse signal is obtained when the flow rate is relatively high and the valve can be rotated stably, but the flow rate is small. In this case, the rotation of the shock is not stable because the water flow does not act on the shock as planned.

Therefore, when the pulse signal number of the flow sensor is used as the reference signal for the ignition operation or the fire extinguishing operation, the rotation of the flow sensor becomes most unstable near the small flow rate at which the flow rate discrimination criterion is set. It is necessary to give a large difference in the reference operation and the fire extinguishing operation to the reference number of the pulse signal corresponding to the reference flow rate value. As a result, the reference number of the pulse signal required for the ignition operation is set to be large, and there is a problem that the ignition operation is rarely performed when the number of pulse signals generated in the case of the flow rate with a low flow rate at the initial start of hot water supply is small.

An object of the present invention is to provide a reliable ignition operation even when the flow rate at the start of hot water supply is low in a control device such as a hot water heater equipped with a flow sensor that generates a pulse signal in accordance with the flow rate.

The present invention includes a flow sensor disposed in a channel including a heat exchanger heated by a heating means, which generates a pulsed signal each time a predetermined flow rate passes through the channel, based on the signal from the flow sensor. In the control apparatus of the hot water heater, which controls the operation of the heating means, a period measuring unit for measuring intervals of occurrence of the signal as periodic information when the signal is generated, and measuring the period information measured by the periodic measuring unit. A periodic information storage section which is stored in order, an average periodic calculation section which calculates an average value of the intervals at which the signal is generated from the plurality of period information stored in the periodic information storage section, and the average period calculation section The flow rate value which calculates the flow volume value of the said channel based on an average value, The said flow volume value computed by this flow volume calculation part is In the period defined by the flow rate or more is the technical means for operating the heating means.

In the present invention, the pulse-like signal generated by the flow sensor is memorized every time it occurs, and the interval of the signal is measured to be periodic information and stored in order. The average value of the stored periodic information is calculated, and the flow rate value is calculated based on the calculated value, and the heating start operation and the heating stop operation by the heating means are executed based on the flow rate value.

In the present invention, the flow rate value is calculated based on the averaged period information indicating the signal interval in the flow rate sensor.

Therefore, even if the flow rate through the waterway is small, the rotation of the flow rate sensor becomes unstable, and even if the interval of generation of the pulse signal becomes unstable, the average value thereof is smaller than the actual change of the generation interval of the pulse signal.

As a result, the change in the flow rate value calculated for determining the heating start according to the heating means is reduced.

Therefore, the difference between the standard flow rate value for starting heating and the standard flow rate value for heating stop can be set small, and the standard flow rate value for heating start can be set to a small flow rate value. In practice, the heating start operation can be performed.

Next, the present invention will be described based on Examples.

In the combustor case 10 of the gas water heater 1 shown in FIG. 2, the combustor 12 which arrange | positioned several burners 11 is arrange | positioned, and the combustion air is combusted below the combustor case 10 with a combustor case 10. As shown in FIG. The blower 13 which supplies the is provided. A water pipe type heat exchanger 30 is formed above the combustor 12 in the combustion case 10, and water passing through the inside is heated by the heat of combustion by the combustor 12.

A sparker 14 for igniting the combustor 12 is provided around the combustor 12 in the combustor case 10 and a frame rod 15 for detecting the ignition of the combustor 12. ) Is provided. An exhaust port 2 for discharging combustion exhaust gas to the outside is formed above the combustor case 10.

Below the combustor 12, the two burners 11 for separating the burner 11 of the combustor 12 in the middle part into 2nd burner group 10A and the 2nd burner group 10B are used independently, respectively. Manifolds 16 and 16a are provided. Since the manifolds 16 and 16a are formed by branching from the combustion supply pipe 20, the manifold 16 is independent of the manifold 16a to the first burner group 10A. In order to manage the supply of fuel gas, the solenoid valve 21 of a heating capability switching copper is formed. In the fuel supply pipe 20, a solenoid valve 22 for managing the fuel supply and a proportional valve 23 for adjusting the supply pressure on the downstream side based on the energizing current are sequentially formed from the upper side.

The water supply pipe 31 for guiding water to the heat exchanger 30 includes an electric water flow control device 32 driven by a gear motor, a flow sensor 33 for generating a pulse signal based on the flow rate, and a water inlet temperature. The water inlet temperature thermistor 34 is formed sequentially from the upstream side, and the hot water flowing out of the heat exchanger 30 is not shown in the hot water supply pipe 35 guiding the hot water inlet. When the thermistor 36 and the hot water are absorbed, an opening / closing valve 37 for stopping the hot water supply is formed without using a faucet (not shown) provided in the hot water supply port.

The gas water heater 1 having the above structure is controlled by the controller 40.

As shown in FIG. 1, the control device 40 includes functions of the data processing unit 41, the temperature control unit 42, the combustion control unit 43, and the sequence control unit 44 constituted by a microcomputer. Is formed to control the combustion state of the combustor 12 based on the set temperature by the operation of the control device 50, and when the hot water supply of the quantity of water set by the control device 50 ends, Close 37).

The data processing unit 41 processes the respective detection signals and the set temperature signals from the flow rate sensor 33, the inlet temperature thermistor 34, the tapping temperature thermistor 36, and the control device 50, and the temperature control adjusting unit 42. At the same time, the water supply temperature information, the tapping temperature information, and the flow rate information required are supplied to the sequence controller 44 to supply the hot water supply amount information by the flow sensor 33.

The flow sensor 33 used in the present embodiment is arranged in the waterway formed by the water supply pipe 31, and forms a fan that rotates by the water passing therethrough. Since the magnetic change caused by the change of the position of the magnet moving along the rotation is detected from the outside by a magnetic detection device such as a Hall IC, a pulse signal is output. Therefore, four pulses are generated during one revolution. For example, the flow rate is a pulse signal of 10 pulses / liter.

Therefore, in the flow sensor 33 having the above characteristics, when the passage flow rate is less than 10 liters / minute, the rotation of the bovine is not stabilized, and the minimum detection flow rate is 2.3 liters / minute. Therefore, in the case where the passage flow rate is 2.3 to 10 liters / minute, even if the actual passage flow rate is constant, the flow rate sensor 33 may not generate pulse signals at regular intervals.

Therefore, in the data processing section 41 of the present embodiment, in the pulse signal processing in the flow rate sensor 33, as shown in FIG. 3, 1) periodic measurement 2) periodic information memory 3) average periodic calculation 4) flow rate Calculation 5) The flow rate recognition is processed to stabilize the tapping temperature.

1) Periodic measurement

When the pulse signal is generated by the flow rate sensor 33, the time t (n) at which the pulse signal is generated is measured as the period information T (n) of the pulse signal.

2) Periodic information memory

The periodic information T (n) of the pulse signal measured by the periodic measurement is sequentially stored in a register of a microcomputer or a storage device of a memory. Here, the four period information T (n−) up to three revolutions is considered in consideration of the effect of four pulse signals generated between one rotation of the flow sensor 33 and the averaging of the periodic section described later. 3), T (n-2), T (n-1), and T (n) are stored in order. Each stored periodic information is replaced one after another when new periodic information is stored, and the oldest periodic information is deleted. Therefore, at time t (n), four period information T (n), T (n-1), T (n-2), and T (n-3) are stored as shown in FIG. In this case, at the time t (n + 1) at which the next pulse signal is generated, as shown in FIG. 5, new period information T (n-1) is stored and three period information T (n) and T (n- 1) and T (n-2) are replaced and stored respectively, and the period information T (n-3) is deleted.

3) Calculation of average standard

When the pulse signal is generated by the flow rate sensor 33 and the periodic information T (n) is measured, the four stored periodic information T (n-3), T (n-2), T (n-1), The average value of T (n) is calculated by the following equation, and the average period information PQ (n) for flow rate calculation is obtained at the time t (n) at which the pulse signal was generated.

PQ (n) = {T (n-3) + T (n-2) + T (n-1) = T (n)} / 4

Here, T (n), T (n-1), T (n-2), and T (n-3) are current period information, one cycle information before, two cycle information, and three times, respectively. The previous cycle information.

4) Flow calculation

Based on the calculated average period information PQ (n),

W (n) = {PQ (n) = b} / Q + C

The flow rate value W (n) [liters / minute] is calculated by

Here, a and b are integers respectively determined by whether the value of the average period information PQ (n) is below the preset period fixed value T1 or above the period fixed value T1, and C is used to correct the flow rate value. Is a flow rate correction value between +1.0 [liter / minute] and -1.0 [liter / minute] supplied by adjusting a variable resistor, not shown.

5) flow rate recognition

Flow rate recognition calculates the difference between the calculated flow rate value W (n) and the previously recognized flow rate value WK (n-1),

(N) -WK (n-1) │ ＞ WK (n-1) × d

At the time of

WK (n) = W (n)

As a result, the current flow rate recognition value WK (n) is determined. Where d is the calculated flow rate value W (n) when the rate of change of the flow rate value W (n) calculated with respect to the flow rate recognition value WK (n-1) previously recognized is somewhat. It is a flow rate recognition value for judging whether or not it is set as, for example, it is supplied as d = 30/100. For the flow rate recognition value WK (n), for example, the flow rate value W calculated by the time WQ (n-1) before the variable WQ (n) supplied at WQ (n) = WK (n) / 100. Find the difference with (n),

At the time of W (n) -WQ (n-1) │ <{WQ (n-1) × d}

WK (n) = WK (n-1) + {W (n) -WK (n-1) × e,

Determine the current flow rate recognition value WK (n). Where e is the ratio of the difference between the flow rate recognition value WK (n-1) and the calculated flow rate value W (n). It is an addition value which is a flow rate for determining, and is supplied as e = 5/100, for example.

By the above-mentioned flow volume recognition process, a big change of the flow volume value WK (n) is immediately received, and a small change is received little by little. This flow rate recognition value WK (n) is supplied to the temperature control part 42 as final information regarding the flow rate. In addition, for each detection information by the thermistor, the respective processes are executed in consideration of the thermistor's response concern, and are supplied to the temperature control unit 42 as respective detection temperature information. The temperature control section 42 calculates the required heating amount based on each piece of information processed by the data processing section 41. When the calculated amount of heating exceeds the heating capacity of the combustor 12, the electric water flow controller 32 is driven to control the amount of inflow water as the heat exchanger 30.

The combustion control unit 43 drives the blower 13 in accordance with the calculated heating amount in the temperature control unit 42, and detects it by the rotation speed of the blower 13, so that the operating state of the blower 13

Therefore, the regulator proportional valve 23 is continuously controlled, the solenoid valve 21 is opened and closed as necessary, and the fuel supply to the first burner group 10a is controlled.

Based on the flow rate recognition value WK (n) detected by the pulse signal from the flow rate sensor 33, the sequence control section 44 performs ignition control at a predetermined sequence when the flow rate within the unit time becomes equal to or greater than the predetermined flow rate. At the same time, when the ignition of the combustor 12 is detected by the frame rod 15, the temperature control control by the temperature control unit 42 is started.

Moreover, when detecting that the flow volume in a unit time became below the predetermined flow volume based on the flow volume recognition value WK (n), each valve is closed and a fire extinguishing operation is performed. Since the ignition operation and the fire extinguishing operation are performed on the basis of the flow rate recognition value WK (n), the difference between the flow rate reference value required for the ignition operation and the flow rate reference value required for the fire extinguishing operation can be set small. The flow rate reference value can be set relatively small.

Therefore, the flow rate at the start of hot water supply is small, so that the ignition operation can be reliably performed even in the case of a small flow rate where the interval between generation of the pulse signal at the flow rate sensor 33 is unstable.

In addition, when the water supply setting of hot water is performed by the control device 50, the number of pulse signals of the flow sensor 33 is integrated to calculate the amount of hot water supply, and when the water supply amount of water reaches the set amount of water, an open / close valve 37 is driven and the hot water supply pipe 35 is closed to stop hot water supply. In this case, the value of the average period information PQ (n) calculated in the same manner as the above-mentioned 3) average period calculation is compared with the period fixed value T2 for the predetermined flow rate calculation equation, and based on the value of the average period information PQ (n). The flow rate integration value is calculated by the flow rate calculation formula.

The gas water heater 1 of the present embodiment having the above configuration operates as follows.

When the operation switch (not shown) formed in the control device 50 is operated, the control device 40 enters the operation standby state. When the user opens the faucet, inflows water from the water supply pipe 31 and starts hot water supply, the flow rate sensor 33 generates a pulse signal based on the flow rate passing therethrough. At this time, when the amount of the hot water supply is small, the rotation of the flow rate sensor 33 becomes unstable accordingly. In this case, for example, regardless of the actual flow rate, if the period of the pulse signal from the flow rate sensor 33 does not become constant as shown in FIG. 6, the period information T (n) also depends on it. Not constant However, the average period information PQ (n) is calculated by averaging period information T (n) with three period information T (n-1), T (n-2), and T (n-3) before this. Since the flow rate value W (n) is calculated based on the average period information PQ (n), even if a pulse signal is generated in an unstable cycle, a stable flow rate value W (n) is obtained. In order to obtain the flow rate recognition value WK (n), a large change in the calculated flow rate value W (n) is immediately accepted, and a small change in the flow rate value W (n) is hardly affected by the ignition operation. The predetermined flow rate required for is easily detected.

Therefore, even if the flow volume at the time of hot water supply start is small, the ignition movement can be reliably shifted.

Based on the pulse signal, the flow rate recognition value WK (n) is calculated, and if it is equal to or greater than the predetermined flow rate, the blower 13 is driven in a predetermined order to perform pre-purge, and the blower 13 When the number of revolutions reaches the predetermined number of revolutions, the spark discharge is carried out in the sparker 14, and the solenoid valve 22, the regulator proportionality valve 23, and the solenoid valve 21 are respectively sequentially. The valve is opened along the time difference of and fuel gas is supplied to the combustor 12 and ignited.

When the ignition is detected by the frame rod 15, the temperature control control is started, and the respective detection information of the flow rate sensor 33, the intake temperature thermistor 34, and the tapping temperature thermistor 36 and the control device 50 are determined. The heating amount is calculated based on the set temperature, and the water passing through the heat exchanger 30 is heated to the target temperature and flows out of the hot water supply pipe 35. When the user operates the faucet during the hot water supply, the flow rate of the flow sensor 33 becomes unstable when the water supply flow rate decreases. However, even if a pulse signal occurs in an unstable cycle, the recognized flow value W (n) is obtained. . In this embodiment, since the flow rate recognition value WK (n) is obtained again, the silver change of the calculated flow rate value W (n) is less likely to be affected, and the fluctuation of the heating amount is reduced to obtain a stable tapping temperature. You lose.

On the contrary, in the case of a form in which the flow rate is substantially changed, the change can be quickly accepted, so that the heating amount according to the changed flow rate can be supplied quickly.

As described above, in the present embodiment, since the ignition operation is understood based on the average value of the pulse signal intervals from the flow sensor, the ignition can be surely performed even when the flow rate at the start of hot water supply is small.

Although the gas water heater is shown in the above Example, it may be based on other fuels, such as petroleum, and electric heating.

Claims (1)

A flow sensor disposed in a channel including a heat exchanger heated by a heating means, the flow sensor generating a pulsed signal each time a predetermined flow rate passes through the channel, and the heating based on the signal from the flow sensor In a control apparatus such as a hot water heater for controlling the operation of the means, a periodic measuring section for measuring intervals of occurrence of the signal as periodic information when the signal is generated, and storing the periodic information measured by the periodic measuring section in the order of measurement. On the basis of the periodic period storage unit, an average period calculation unit that calculates an average value of the intervals of occurrence of the signal from the plurality of period information stored in the period information storage unit, and the average value calculated by the average period calculation unit. And a flow rate calculation unit for calculating the flow rate value of the water channel, and the flow rate value calculated by the flow rate calculation unit is When more than the amount, the controller of the hot water heater and so on, characterized in that for operating the heating means.

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