JPS6298120A - Instantaneous gas hot-water supply apparatus - Google Patents

Abstract

PURPOSE:To set efficiently the quantity of air required for each number of burner by means of one feed air fan and improve the accuracy of function of proportional combustion as well, by providing a first burner capable of charging gas quantity and a second burner capable of changing the ratio of combustion period and downtime, controlling them by means of a controller which minimizes excess and deficiency of required air quantity. CONSTITUTION:A first burner 3 provided in a combustion chamber 2 is a proportional control burner which gives a quantity of heat corresponding to the quantity of gas supplied dependingly on the opening of a proportional valve 3'. A second burner 4 is a burner whereby a proportional combustion of gas having a quantity corresponding to the opening of a proportional valve 4' and an intermittent combustion by changing the ratio between a combustion period and a downtime is performed. A controller 5 computes required quantity of heat on the basis of each element of a flow rate, water inlet temperature, set temperature, hot-water outlet temperature etc. so that the first burner 3 and the second burner 4 are used separately or concurrently according to the number of burners for combustion. And the number of revolutions of a feed air fan 7 is controlled by selecting the quantity of supply air required by the number of burners for combustion.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a gas instantaneous water heater.

(Prior Art) Conventionally, there are various structures as gas instantaneous water heaters, but in recent years, so-called gasification type water heaters that control the temperature of hot water by the amount of gas have become mainstream.

However, due to the structure of the burner in a gas instantaneous water heater, the minimum number that can be proportionally controlled is limited, and the minimum number is usually 1/47'J to 115 of the maximum number.

On the other hand, there is a method disclosed in U.S. Pat. This model provides a proportional control burner and an on/off control burner for one heat exchanger model, and sets the lower limit combustion LA (minimum number) of the on/off control burner (combustion opening number) to the proportional control bar (minimum number). The initial ignition is performed by the on-off control burner, and the minimum capacity combustion is performed only by the on-off control barb, but the on-off control burner is proportionally controlled! Since it is branched downstream of the proportional valve of No. 11 burner, it is impossible to make the number too small, and it is impossible to obtain a combustion level very close to 0@.

In addition, since the number of A-off υ JiIl burners is set to be slightly lower than the minimum number of proportional control burners, there is a gap between the combustion ω of both burners, and from the maximum number to the minimum number. It is not possible to control it continuously without interruption.

Furthermore, since two burners are used, it is necessary to adopt a structure in which fans are individually provided in the air supply paths to both burners as ventilation means, and the required air 9 to both burners is set depending on the fan rotation speed. The use of a fan not only complicates the structure and makes operation troublesome, but also causes problems that increase the required cost.

In order to solve the above-mentioned problems, the applicant of the present invention made an invention as disclosed in Utility Model Application No. 59-238811. The gas instantaneous hot water supply system t of this invention has a first burner that controls the amount of heat by changing the gas supply, and a first burner that controls the amount of heat by repeating combustion and extinguishing and changing the ratio between the combustion time and the extinguishing time. A second barb is provided to perform the following combustion control.

(Table 1) By controlling the water heater as described above, it is possible to seamlessly control the water heater from the minimum number to the maximum number, but it cannot be controlled unless the proportional range of the second burner is widened. The accuracy was not very good.

(Problems to be Solved by the Present Invention) The problems that the present invention attempts to solve are to reduce the minimum number of months to nearly 0, and to create a continuous film from the minimum number to the maximum number. In order to do this, we made it possible to efficiently set the amount of air required to burn each number of burners with a single air supply fan, and also provided the first burner with a proportional combustion function. The purpose is to increase the accuracy by dividing the proportional range between the first and second burners.

(Means for solving the problems) In order to solve the above problems, the technical measures taken by the present invention are as follows.

(b) In one combustion chamber, there is a first burner that controls the amount of heat by changing the amount of gas, and a second burner that controls the amount of heat by changing the amount of gas or the ratio of combustion and extinguishing time. and communicate with a controller to fire both burners selectively or simultaneously.

(b) An air supply duct with an air supply fan that supplies air to both burners is connected to the combustion chamber.

(c) The air supply fan is controlled via the controller so as to obtain the rotational speed of the air volume that minimizes the excess or deficiency based on the air volume required for combustion in one or both of the burners used.

(Function) The effect of the technical means of the present invention is to control the amount of heat by repeating combustion and extinguishing of the second burner and changing the ratio of combustion time to extinguishing time. By increasing the ratio of the extinguishing time to the fire extinguishing time, the number of consecutive numbers can be decreased continuously and the minimum number can be brought close to zero. Therefore, depending on the vj with the first burner, the maximum number of water heaters is the sum of the maximum numbers of both burners, and the minimum number is close to the minimum number of the second burner, 111 and 0.

If the maximum number of burners of the second burner is set to be equal to or greater than the minimum number of burners of the first burner, there will be no discontinuity in the water heater from the maximum number to the minimum number.

Also, the first burner, the second burner, or the first burner. When using both of the second burners, the controller controls the flow of air to minimize the excess or deficiency depending on the situation based on the amount of air required for combustion, so only one air supply fan is required for combustion. can supply the minimum amount of air necessary for

In particular, by sharing the range of proportional combustion between the first burner and the second burner, the accuracy of proportional combustion can be further improved.

(Embodiment) The configuration of an embodiment of the present invention will be explained with reference to FIG. 1. The gas temperature supply device of this embodiment has a first
．． The second burner (3) (4), its first. An air supply duct (6) that supplies air to the second burners (3) and (4); Second
The burners (3) and (4) may be turned on to burn selectively or simultaneously, or the first burner (
3) and/or control the fan 7 in the supply air duct (6) to blow the amount of air for combustion to the second burner (4).
It consists of a controller (5).

The first burner (3) is a proportional control burner that obtains the amount of heat corresponding to the supplied gas by supplying gas according to the accuracy of the proportional valve (3゛), and is branched from the JS pipe (8). In the first gas pipe (8a), a first solenoid valve (9), a governor (io), and a proportional valve (3') are installed in order from the upstream side, and the proportional valve (3') is provided downstream of the proportional valve (3'). By changing the opening degree of the valve (3') and changing the supply gas output, the amount of heat can be freely changed.

The second burner (4) performs proportional combustion corresponding to the supplied gas mold by supplying gas according to the accuracy of the proportional valve (4'), and repeats combustion and extinguishing to change the ratio of combustion time and extinguishing time. This is a burner that performs intermittent combustion with different amounts of heat, and a second solenoid valve (11), a governor (12), a proportional valve ( 4') are sequentially deployed.

By repeating the opening and closing of the second solenoid valve (11), intermittent combustion can be performed, and by changing the ratio of the time when the combustion flame is on and the time when the flame is extinguished, the implied state can be changed, and in the case of continuous combustion. The amount of heat can also be changed by controlling the opening degree of the proportional valve (4°).

In addition, the water heater (100) has a water supply pipe section (1') arranged so that the water flows through one heat exchanger (1),
) Below is the above-mentioned No. 1. 2nd bar - (3) (4) into the combustion chamber
2).

The supply air duct (6) is the first air supply duct (6) in the combustion chamber (2). Second
It is connected in communication with the boundary area of the burners (3) and (4), and has an air supply fan (7) built inside.

By the way, in this example, the first burner 3) is 5
The minimum number of burners is 4 and the maximum number is 16. It is configured so that the maximum number is 6.

Next, the relationship between the combustion number and the burner will be described.

"No. 0 to 25" is intermittent combustion only in the second burner (4).

"No. 1.6-6" is proportional combustion only in the second burner (4).

"Nos. 4 to 10" are proportional combustion only in the first burner (3). The first burner (3) is capable of proportionate combustion of No. 4 to No. 16 as described above, but the accuracy is improved by using the range of No. 4 to No. 10, which has good proportional accuracy.

"No. 8-21" is simultaneous proportional combustion with the first burner (3) and the second burner (4).In order to improve accuracy, it is not "No. 8-22" but "8-21@".

Therefore, if the water heater (100) uses only the second burner (4), the first burner (3) will be in the range of No. 1.6 to No. 6.
) can be used in the range of No. 4 to No. 16,
Moreover, if the first burner (3) and the second burner (4) are used at the same time, it can be used in the range of No. 5.6 to No. 21.

Overall, Il et al. will have capabilities ranging from No. 1.6 to No. 21.

In this embodiment, the minimum number on the second bar (4) was set to 1.6, but it is also possible to use a smaller number, such as 0.5 or 1. Pay by J! ! (100) The overall minimum number can be made smaller.

In that case, the controller (5) controls the flow rate, inlet water temperature,
The required amount of heat is calculated based on factors such as the set temperature, hot water tap temperature, thermal efficiency of the heat exchanger, and proportional gain, and when the calculated required amount of heat can be covered by the first burner (3), the first burner (3) Use only burner (3),
Only the second burner (4) is used for cuts that are smaller than the minimum number of the first burner, or slightly larger than the minimum number, but smaller than a predetermined number. Moreover, when the required heat amount is larger than the maximum number of the first burner (3), the first burner (3) and the second burner (4) are used.

The above flow ta is measured by a water flow sensor (14) installed upstream of the heat exchanger (7) in the water supply pipe (13), and the incoming water temperature is determined by the incoming water temperature sensor (1) installed near the inlet of the heat exchanger (1).
5), the hot water temperature is determined by the heat exchanger (1) installed near the outlet (
) detected by the Tadeigata sensor (16),
A signal is input to the controller (5), and the set temperature is set by the humidity setting section (18) of the control box (20) and input to the controller (5).

Further, the required combustion air for the second burner (4) and the first burner (3) is shown in FIG. 2 as a graph of the relationship with the combustion number.

[The required air m (A') for intermittent combustion in the second burner (4) of 0 to 2.5 @ J is 0.26 M? /min, but if only this second burner (4) is used, the partition wall (
2') to escape to the first burner (3),
A supply air amount (A) of 0.62 x/win is required at all times.

The required air fia (B') in the second burner (4) proportional combustion of "No. 16-6" is 0.1-0.51 Tl'1'
/min, but in order to escape to the first burner (3) side, the increase is 0.23 to 1.3m/ff1.
A proportional supply air jti (B) up to in is required.

The required air amount (C') in the first burner (3) proportional combustion of "No. 4 to 10" is 0.13 to 0.76 yn'/ll
Although it increases proportionally to 1 inch, a proportional supply air ffi (C) of 0.23 to 1.3 /min is required to escape to the second burner (4) side.

Required air amount (B”) (C”) for simultaneous combustion of the first burner (3) and second burner (4) of “No.
) are each 0.1 to 0.53 m”/sin.

Although it is proportional to 0.13 to OJ6 TII'/min, by supplying the necessary supply air m(r) to the combustion number 11.6 to 6 of the second burner (4) The second burner (3) excluding the necessary air ff1(B”)
The air escaping to the burner (4) side can be used as it is as the required air amount (C'') for the second burner (4).

When using only the second burner (4) as described above,
When only the first burner <3) is used, and the first burner <3) is used. Supply air amount (Δ) (B) (C) (D) required depending on the situation, such as when using both second burners (3) and (4).
are different, but 1 fl of such supply air (A) (B) (C
) (D) control of the insect feeding 1 is also performed via the controller 1-roller (5). In this case, the required heat (n) is calculated in the controller (5) based on factors such as the flow m, the water inlet temperature, the set temperature, the outlet temperature, the thermal efficiency of the heat exchanger, and the proportional gain. When the combustion number is set based on the amount of heat, the set combustion number is selected from the supply air 11 (△) ([3) (C) (D) that is required and the supply air fan (7 ) has a built-in 11tffi control circuit that controls the rotation speed of the motor.

The rotational speed of the air supply fan (7) required at that time is as shown in the graph of the relationship between the combustion number and the fan rotational speed in FIG. 3.

In addition, the controller 1-roller (5) is on the 4th floor of the water heater (1oo).
Also, (21) is an operation switch provided in one unit or in a control box (20), and when it is turned on, it enters a standby state and waits for the next water heater to be used.

(effect) Since the present invention has the above configuration, it has the following advantages.

(1) Compared to the conventional example shown in Table 1, by increasing the number of combustion sections as shown in Table 2, more accurate combustion control is possible.

(2) Since the rotation speed of one air supply fan is controlled so that the amount of air necessary to burn the first burner and/or the second burner is not too much or too little, the structure is simple and costs are reduced. Not only this, but also the smallest possible air supply fan can be used, further improving the efficiency of air accumulation.

(3) By using only the second burner, the minimum number of water heaters as a whole can be reduced to nearly zero.

(4) By using the first burner and the second burner simultaneously, a number corresponding to the sum of the maximum numbers of both burners can be obtained, and the maximum number can be increased.

(5) By making the minimum number of the first burner and the maximum number of the second burner the same, or by making the minimum number of the first burner smaller than the maximum number of the second burner, the maximum number can be changed to the minimum number. It is possible to control the number continuously without interruption.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the present invention, and is a schematic diagram of a 1-gas instant hot water supply system. Figure 2 is a graph showing the relationship between combustion number and air amount. Figure 3 is a graph showing the relationship between combustion number and air supply. It is a graph showing the relationship with the rotation speed of the fan. In the figure, (2): Combustion chamber (3): First burner (4): Second burner (5): Controller (6): Supply air duct (7): Supply air fan <1): #, The intersection is +11Ji5. Patent applicant Totoki Co., Ltd. Figure 1 2'

Claims (1)

[Claims] In one combustion chamber, there is a first burner that controls the amount of heat by changing the amount of gas, and a second burner that controls the amount of heat by changing the amount of gas and repeating combustion and extinguishing to change the ratio of combustion time and extinguishing time. 2 burners are provided, and these burners are connected to a controller so as to burn both burners selectively or simultaneously, and an air supply duct that supplies air to both burners is connected to the combustion chamber, and a This is a gas instantaneous hot water heater in which the fan is controlled via a controller to obtain a rotational speed that minimizes excess or deficiency based on the amount of air required for combustion in the burner used.