JPH01189457A - Hot water supply device - Google Patents

Abstract

PURPOSE:To prevent the passage of water at excessive flow rate and supply hot water at a preset temperature even when a specified capacity can not be obtained, by comput ing the maximum capacity No, which can actually output, and limiting the passage of water based on the calculated actual capacity. CONSTITUTION:A capacity No. output section 13 outputs a capacity No. or a size number (which indicates the output capacity of referred model) which is a sum of a required size number output from a required size number arithmetic operation section 11 and a feedback size number output from a feedback size number arithmetic opera tion sectiorl 12. An actual size number arithmetic operation section 15 inputs output hot water temperature TH, input water temperature TC, a flow rate of water to be supplied Q, and outputs an actual size number calculated based on said above data. A maximum actual size number arithmetic operation section 17 computes a maximum actual size number based on the ratio between an actual size number and an output size number. A maximum flow rate arithmetic operation section 18 computes a maximum flow rate of water Qmax, which makes it possible to output hot water at a preset temperature based on a maximum actual size number, a preset temperature TS, and an input water temperature TC. A drive control section 9 controls a water quantity control means 20 in such a manner that the flow rate of water Q may not exceed the maximum flow rate Qmax.

Description

[Detailed description of the invention] (Analysis field of use) The present invention relates to a water heater.

(Prior Art) Conventionally, in order to solve the problem that when water is passed at an excessive flow rate that exceeds the capacity of the water heater, the water temperature drops and hot water cannot be dispensed at the set temperature, a water flow adjustment means has been provided and the water heater A system is known in which the flow rate of water is reduced to the maximum flow rate at which hot water at a set temperature can be produced, depending on the maximum capacity.

(Problem to be solved by the invention) However, in conventional water heaters, fuels with different calorific values are sometimes used in the same appliance.For example, among the many city gases, 12A gas and 13A gas are different. They are classified as one group and are commercialized so that the same equipment can be used without modification for both gas types with different calorific values, but for example, when using 13A gas, a specified capacity can be obtained. If you set the 4 settings like this, if 12A gas with a low calorific value is used, you will naturally not be able to obtain the desired capacity. For example, what should have the maximum capacity of No. 16 actually has a maximum of No. 14. However, with the conventional water heater, the maximum capacity is only 1.
Since the maximum flow rate is calculated as No. 6 and the water flow rate is controlled, water is passed at an excessive flow rate, and there was a point where the tB hot water temperature could not reach the set temperature.

The present invention solves the above-mentioned conventional problems, and controls a water heater so that hot water can be supplied at a set temperature even when the desired capacity cannot be obtained due to the influence of supplied fuel or individual differences in appliances. The purpose is to provide equipment.

(Means for solving problems) In order to achieve the above object, the present invention has the following configuration. That is, in the device that operates the inlet water temperature detection means, outlet hot water temperature detection means, water flow rate detection means, hot water temperature setting means, and water flow rate adjustment means, the actual number is determined based on the inlet water temperature, outlet hot water temperature, and water flow rate. A means is provided for calculating τA and comparing it with the control output number at that time to calculate a maximum actual number, and the water amount adjusting means is controlled based on the maximum actual number, the set humidity, and the inlet water temperature. I have to.

(Function) When the outlet hot water temperature is stable, read the outlet hot water temperature, inlet water temperature, and water flow rate, calculate the actual number based on these, and read the control output number at this time to find the ratio of the two. The maximum actual capacity number is calculated using this ratio, and the maximum flow rate is calculated based on this maximum actual capacity number, the set temperature, and the inlet water temperature, and the water volume -
Control your hands. Therefore, the flow rate of water is limited to a flow rate corresponding to the actual capacity of the plate, and the temperature of the hot water does not drop due to an excessive flow rate.

(Example) FIG. 2 is a schematic diagram of the water heater according to the present invention, and (1
) is a heat exchanger, (2) is a water inlet pipe, and (3) is a hot water outlet pipe. The inlet pipe (2) is provided with water flow rate detection means (4) and inlet water temperature detection means (5), and the outlet pipe (3) is provided with outlet hot water temperature detection means (6) and water flow rate adjustment means (7). It is set up.

The water amount adjusting means (7) consists of a valve member and driving means such as a motor for driving the valve member. (7) is a burner, (8) is a proportional control valve that fMJIllall the Hahana (7J Henokasu supply lid), (9) is a hot water temperature setting means. (4), reading signals from the inlet water temperature detection means (5), the outlet water temperature detection means (6), and the hot water temperature setting means (9);
The proportional control valve (8) and the water j1 regulating means (1) are controlled.

FIG. 1 is a functional block configuration diagram showing an embodiment of the present invention, and shows the functions of the main parts of the control device. αυ is the inlet water temperature detection means (5), the water flow rate detection means (4), and the hot water temperature setting means (signal from the season, that is, the inlet water temperature (To)
, a 77 number calculation unit that inputs the water flow rate (Q) and set temperature (TS) and calculates the required number (hereinafter referred to as FF number);
(b) is the outlet hot water temperature detected by the outlet hot water temperature detection means (6)
TH] and the set temperature (T8) to calculate a feedback number (hereinafter referred to as FB number). (2) is the FF number output from the FF number calculation unit αυ and the F output from the pB number @ calculation unit (b).
The number output section that outputs the number combined with the number B, σ◆ is a proportional control valve (8
) is a gas proportional control section that outputs a control current. (7)
are the outlet temperature (TH), the inlet water temperature (To), and the water flow rate (Q
) is input, and the real number calculation unit calculates and outputs the real number, (1
Reference numeral 1 denotes a comparison calculation unit that compares this real number with the output number from the ro ij symbol output unit so and calculates the ratio between the two. σ
η is the maximum actual number calculation unit that calculates the maximum actual number based on the ratio of the actual number and the output number, and a fault is the maximum actual number, the set temperature (TS), and the inlet water temperature (To). The maximum flow rate calculation unit calculates the maximum water flow m (Qm & ri) that enables hot water at the set temperature to be dispensed based on This is a drive control section that controls the water amount adjusting means (1).

When the water heater is connected to a power source and hot water is first dispensed, the maximum flow rate calculation section (G) calculates the maximum flow M (Q) using the device's original maximum capacity.
Perform the calculation ffi&ri. For example, for an instrument with maximum capacity No. 16, the maximum flow flt (Ctmax) is Qmax-
The total is 16X25/(TS-To). However, this M! If the maximum capacity of No. 16 can be obtained when the tool uses 13A gas, the expected capacity cannot be obtained when 12A gas with a low calorific value is used, and the maximum flow M (QnlX ) actually results in an excessive flow rate.

Therefore, when the faucet is opened sufficiently, the hot water temperature (THJ) is stabilized at a temperature lower than the set temperature (TS).

At this time, as shown in FIG. 3, the actual number calculation section σ reads the outlet temperature (TH), inlet water temperature (TO), and water flow rate <Q), and calculates the actual number. That is, the real number is −Q(TH−T O)/25. On the other hand, at this point, the it+1ml output number outputted from the number output section α4 is naturally the maximum number 16, and the ratio of the above actual number and this output number is the comparison subtraction section Q.
Q is calculated, and the maximum actual number is calculated in the maximum flow rate calculating section αη. In the above example, if the calculated real number is 14, the maximum actual number is calculated as -16 x 14/16 - 14,
After this point, the maximum actual power number is input to the maximum flow rate calculation section (T), and the maximum flow rate (Qmax) is calculated as follows: x-14X25/(TS-To).

On the other hand, if the faucet is throttled when first dispensing hot water, the capacity range will not be exceeded, so hot water can be dispensed at the set temperature (TSJ) by controlling the gas supply amount, but in this case as well, the maximum The actual power number is calculated. First, at the start of hot water dispensing, the set temperature (TS), water inlet temperature (TO), water flow 1
it (read Ql and read No. 77 number performance nose part (6) IPF
The number is calculated by flI. That is, the IFF number ■Q(TS-To)/25. This IFF number is output from the number output section side,
The proportional control valve (8) is controlled via the gas proportional control section α4 to control the amount of gas supplied to the burner (7). Then, the hot water outlet temperature (TH) is detected by the hot water outlet temperature detection means (6), and if there is a 1M1 degree deviation compared to the set temperature (TS), the number of degrees to be added or subtracted, that is, the FB number, to eliminate the deviation. is calculated in the FB number calculation section (b), and a number obtained by combining the number 12 and the FB number is output from the output section. Then, when the hot water outlet temperature (TH) becomes equal to the set temperature (TSJ) and becomes stable, read the hot water outlet temperature (TH), the inlet water temperature ('f'o), and the water flow rate (Q,) to determine the actual value. A real number is calculated in the number calculation unit (4).For example, the above p
Even if the y number is calculated as 7 and the proportional control valve (8) is controlled, the ability of 7 cannot actually be obtained, and the FB number calculation section (
When the FE number calculated in b) is 1, the hot water temperature (TH
) becomes equal to the set temperature (TS) and becomes stable, the control output number from the number output part side is number 8. At this time, if the actual number is calculated as number 7, the comparison calculation Maximum actual number -1 in maximum actual number calculation part ση via part αQ
It is calculated as 6X7/8-14. This maximum actual capacity number is input to the maximum flow rate calculation section (7), and the water pair adjustment means (7) is controlled M according to the actual capacity.

In addition, such calculation of the maximum capacity number is not limited to the first time hot water is drawn after the power is turned on to the appliance, but the calculated value may be updated continuously thereafter, and the calculated value may be determined as the average value of multiple calculation results. Also good.

(Effects of the Invention) The present invention has the following excellent effects. In other words, we calculated the maximum capacity that could actually be produced and limited the amount of water flow based on that, so the desired capacity could not be achieved due to factors such as the effect of the fuel being supplied and individual differences in equipment. Even if there is no water flow, it is possible to prevent water from flowing at an excessively high flow rate and to provide hot water at the set temperature.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram of the main parts showing an embodiment of the present invention, Fig. 2 is a schematic diagram of a water heater according to the invention, and Fig. 3 is a main part showing the operation of the embodiment of the invention. This is the 70-chart. (4) Water flow rate detection means (5) Inlet water temperature setting means (6) M1ii temperature detection means (9) Hot water temperature setting means QG Control device ...Actual number calculation section αQ...Comparison calculation section αη...Maximum actual number calculation section (g)...Maximum flow rate calculation section 4...Water lid adjustment means III Figure 3

Claims (1)

[Claims] In a device having an inlet water temperature detection means, an outlet hot water temperature detection means, a water flow rate detection means, a hot water temperature setting means, and a water flow rate adjustment means, the actual number is calculated based on the inlet water temperature, the outlet hot water temperature, and the water flow rate, A hot water supply characterized by providing means for calculating a maximum actual number by comparing it with a control output number at that time, and controlling the water amount adjusting means based on the maximum actual number, a set temperature, and an incoming water temperature. vessel.