JPH0536244U - Oil instantaneous water heater - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an oil instantaneous hot-water supply system that has a large maximum hot-water supply output, is easy to use when discharging a small amount of hot water, and has a simple structure and control. [Configuration] A first burner 1 with a refueling output of 30,000 kcal / h class and a second burner 2 with a refueling output of 1,000 kcal / h class are provided. For the first burner 1, the amount of fuel spray changes according to the hot water supply output so that the fuel burns continuously, and for the second burner 2, combustion and extinguishing are repeated with a constant amount of fuel spray depending on the hot water supply output. To operate. Further, when the oil supply output is 30,000 kcal / h or less, only the first burner 1 is operated, and when the hot water supply output is 30,000 kcal / h or more, the first burner 1 and the second burner 2 are operated simultaneously. Each burner 1,
Combustion air is supplied to 2 with one fan.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil instantaneous hot water heater used at home, and in particular, it has a large maximum hot water output, is easy to use when discharging a small amount of hot water, and has a simplified structure and control.

[0002]

[Prior Art]

 In recent years, a so-called proportional control water heater is available on the market, which can change the fuel oil spray amount according to the hot water output and can supply hot water at a set temperature within the capacity range regardless of the water supply temperature and the amount of hot water discharged. Came to the end.

In this type of water heater, when a water amount exceeding the minimum water amount set in the water amount detector 40 flows through the water supply pipe 41 as shown in FIG. 4, the blower 42 operates to start sending combustion air, and a predetermined amount of water is supplied. After a lapse of time, the ignition transformer 43 operates and the ignition electrode 44 starts discharging.

After the discharge is started as described above, the electromagnetic pump 45 pressure-feeds the fuel to the nozzle 47 with the return circuit via the fuel pipe 46, and the fuel sprayed from the nozzle 47 is discharged from the ignition electrode 44. It is ignited by the discharge of and burns. When the combustion is started in this way, the flame monitoring device 48 detects the combustion flame and stops the operation of the ignition transformer 43 after a predetermined time, while continuing the combustion.

By the way, the water that reaches the heat exchanger 50 via the water temperature detector 49 while flowing through the water supply pipe 41 from the water amount detector 40 side is heated when passing around the heat exchanger 50, Hot water is supplied from the faucet 53 through the hot water supply temperature detector 52 while flowing through the hot water supply pipe 51.

Regarding the temperature control of the hot water supplied as described above, the necessary heat amount is calculated in the controller unit 54 from the water amount detected by the water amount detector 40 and the water temperature detected by the water supply temperature detector 49. Then, the amount of fuel required for this required amount of heat is calculated, and the return valve 55 is set to a predetermined opening according to the amount. As a result, a part of the fuel returns from the nozzle 47 to the inflow side of the electromagnetic pump 45 via the return pipe 56, the amount of fuel spray changes, the amount of combustion is adjusted, and the temperature of the hot water is adjusted.

At the same time, after detecting the temperature of the hot water adjusted as described above by the hot water supply temperature detector 52, the detection result is fed back to the controller unit 54 to correct the adjustment of the combustion amount and to perform the temperature control. Is configured to raise the system.

The controller unit 54 is also configured to calculate the combustion air according to the combustion amount, and change the rotation speed of the blower 42 based on the calculation result to control the air amount. ..

[0009]

[Problems to be solved by the device]

 By the way, in the above oil instantaneous water heater, in order to secure the combustion performance of the burner, the ratio of the maximum combustion amount to the minimum combustion amount (hereinafter, referred to as TDR) can be secured only about 1: 1/5. Is the current situation. On the other hand, regarding the maximum hot water supply capacity of water heaters, the demand for large-scale hot water has increased in recent years, and a hot water output of around 40,000 kcal / h is desired.

However, in the conventional hot water heater, when the maximum hot water output is 40,000 kcal / h under the limitation of the burner performance of TDR of about 1/5 as described above, the minimum hot water output is Since it is 8,000 kcal / h, especially when a small amount of hot water is discharged in the kitchen or washroom, the hot water output is too large to obtain a small amount of hot water, so it is extremely inconvenient to use. ..

[0011] Further, in place of the above-mentioned equipment having a minimum TDR of about 1/5, a small amount of tap water requiring a TDR smaller than 1/3 is required for an equipment having a minimum TDR of about 1/3. At the same time, a method of controlling the temperature by repeating combustion and extinguishing of the burner (hereinafter referred to as ON / OFF control) is also used, but a small amount of hot water in the kitchen or washroom does not use a mixed faucet. Since it is often used, such ON / OFF control causes fluctuation of the hot water temperature due to burning and extinguishing of the burner, and is inconvenient in terms of stable hot water temperature.

Furthermore, recently, two small burners having a maximum hot water supply output of 30,000 kcal / h class and a TDR of about 1/3 are used together, and the combustion amount of both burners is adjusted to increase the TDR. A large number of 1 to 1/6 has been introduced, but in this case, the expensive fuel return mechanism and blower etc. are installed for all 2 sets, so the equipment becomes expensive and 2 There is a problem that the control for interlocking individual burners becomes complicated.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a large maximum hot water supply output, good usability for discharging a small amount of hot water, and an oil instantaneous type with simple structure and control. To provide a water heater.

[0014]

[Means for Solving the Problems]

 In order to achieve the above object, the device according to claim 1 is provided with a first burner that burns continuously with the fuel spray amount changing according to the hot water supply output, and is installed next to the first burner. In addition, a second burner that repeats combustion and extinguishing according to the hot water supply output with a constant fuel spray amount, and a first combustion air that continuously changes the air flow rate according to the fuel spray amount of the first burner It is characterized in that it is provided with a supply means and a second combustion air supply means for changing the air volume stepwise in accordance with the combustion / extinction of the second burner.

The invention according to claim 2 is characterized in that the maximum hot water supply output by the first burner is about 30,000 kcal / h and the maximum hot water supply output by the second burner is about 10,000 kcal / h.

According to the third aspect of the invention, when the hot water supply output is 30,000 kcal / h or less, only the first burner is operated, and when the hot water supply output is 30,000 kcal / h or more, the first burner and the second burner are simultaneously operated. It is characterized by comprising a controller unit for activating.

According to a fourth aspect of the present invention, the first and second combustion air supply means include one blower and an opening located on the blower port side of the blower and facing the blower port. It is characterized by comprising an air supply damper and one solenoid valve for moving the air supply damper back and forth toward the blower opening.

[0018]

[Action]

 According to the present invention, the first burner burns continuously with the fuel spray amount changing according to the hot water supply output, and the second burner repeats combustion and extinguishing according to the hot water supply output with a constant fuel spray amount. .. At this time, the combustion air in the first burner is supplied with the air volume continuously varied from the first combustion air supply means according to the fuel spray amount, and the combustion air in the second burner is The air volume is gradually changed and supplied from the second combustion air supply means in accordance with combustion / extinction.

[0019]

【Example】

 Hereinafter, an embodiment of the instant oil hot water supply device according to the present invention will be described in detail with reference to FIGS.

As shown in FIG. 1, this water heater has a second burner 2 adjacent to the first burner 1, and the first burner 1 has a maximum combustion amount corresponding to a hot water supply output of 30,000 kcal / h. It has a nozzle with return circuit 3, an electromagnetic pump 4 and a return valve 5. The electromagnetic pump 4 is installed in the middle of the fuel pipe 6 connected to the nozzle 3, while the return valve 5 is connected to the return pipe 7 The return pipe 7 is connected to the nozzle 3 while branching from the inlet side of the electromagnetic pump 4 while being provided on the way.

Further, an ignition electrode 8 and a flame monitoring device (Cds) 9 are arranged near the nozzle 3, and the ignition electrode 8 starts a discharge by the operation of the ignition transformer 10. 9 is configured to detect the combustion flame of the first burner 1.

On the other hand, since the second burner 2 has a maximum combustion amount corresponding to a hot water supply output of 10,000 kcal / h, it has a nozzle 11 and an electromagnetic pump 12, and the electromagnetic pump 12 is in the middle of the fuel branch pipe 13. The fuel branch pipe 13 is branched from the inlet side of the electromagnetic pump 4 constituting the first burner 1 and connected to the nozzle 11.

An ignition electrode 14 and a flame monitoring device 15 are also installed in the vicinity of the nozzle 11, and the flame monitoring device 15 operates so that the ignition electrode 14 starts the discharge by the operation of the ignition transformer 16. It is configured to detect the combustion flame of the two burners 2.

By the way, the nozzles 3 and 11 and the ignition electrodes 8 and 14 that compose the first and second burners 1 and 2 are housed in one air supply passage 17 and One blower 18 is provided as one of the first and second combustion air supply means on one end side of the opening of the passage 17, and the blower 18 uses blades 20 in a casing 19 as a motor as shown in FIG. By rotating at 21 the combustion air is supplied from the blower port 18a to the air supply passage 17 side.

An air supply damper 22 is provided on the side of the air blower 18a, and the air supply damper 22 is moved back and forth toward the air blower 18a by a solenoid valve 23 to open the air blower 18a. It is configured to open and close.

Further, an opening 24 is formed in the air supply damper 22, the opening 24 is formed so as to face the blower opening 18 a, and the air blower 22 is used to blow the air. Even if 18a is closed, a limited amount of combustion air can be supplied.

The hot water supply circuit of the hot water supply device has a water supply pipe 25 and a hot water supply pipe 26, and a water amount detector 27 and a water supply temperature detector (water supply thermistor) 28 are provided in the middle of the water supply pipe 25. A heat exchanger 29 and a hot water supply temperature detector (hot water supply thermistor) 30 are installed in the middle of 26.

The controller unit 31 controls each sensor and actuator connected by dotted lines in the figure according to the setting of the operation unit (remote controller) 32. Particularly, when the oil supply output is 30,000 kcal / h or less. Only the first burner 1 is sometimes operated, and when the hot water output is 30,000 kcal / h or more, the first burner 1 and the second burner 2 are operated simultaneously.

Next, the operation of the oil instant water heater constructed as described above will be described with reference to FIGS. 1 to 3.

When the hot water supply output is 30,000 kcal / h or less (between a and b shown in FIG. 3), only the first burner 1 changes the fuel spray amount according to the hot water supply output and continuously burns. In addition, the air volume from the blower is continuously changed according to the fuel spray amount.

That is, in this case, when the amount of water equal to or more than the set minimum amount of water reaches the water amount detector 27 while flowing through the water supply pipe 25, the blower 18 is activated. At this time, the air supply damper 22 closes the blower port 18a. Therefore, the blower 18 starts sending the combustion air to the air supply passage 17 side only through the blower port 18a and the opening 24.

Then, after a lapse of a predetermined time, the ignition transformer 10 operates and the ignition electrode 8 starts discharging, and then the electromagnetic pump 4 pumps the fuel to the nozzle 3 side through the fuel pipe 6. As a result, the fuel sprayed from the tip of the nozzle 3 is ignited by the discharge from the ignition electrode 8 to start combustion. When the combustion is started in this way, the flame monitoring device 9 detects the combustion flame, the ignition transformer 10 is stopped after a predetermined time, and the first burner 1 continuously burns.

On the other hand, the water that has reached the heat exchanger 29 via the water temperature detector 28 while flowing from the water amount detector 27 through the water supply pipe 25 is heated when passing around the heat exchanger 29, Hot water is supplied from the faucet 33 through the hot water temperature detector 30 while flowing through the hot water pipe 26.

As for the temperature control of the hot water supplied as described above, in the controller unit 31, the required heat quantity is calculated from the water quantity detected by the water quantity detector 27 and the water temperature detected by the water supply temperature detector 28. At the same time, the amount of fuel required for this required amount of heat is calculated, and the return valve 5 is set to a predetermined opening according to the amount. As a result, a part of the fuel from the nozzle 3 returns to the inflow side of the electromagnetic pump 4 via the return pipe 7, the amount of fuel spray changes, the amount of combustion is adjusted, and the temperature of the hot water is adjusted.

At the same time, the temperature of the hot water adjusted as described above is detected by the hot water supply temperature detector 30, and the detection result is fed back to the controller unit 31 to correct the adjustment of the combustion amount. By increasing the control system, hot water having the temperature set in the operation unit (remote control) 32 is supplied.

Further, when the hot water supply output is 30,000 kcal / h or less (between a and b shown in FIG. 3), the controller unit 31 calculates combustion air according to the combustion amount of the first burner 1. Then, the rotation speed of the blower 18 is changed on the basis of the calculation result, and operation is performed so that an appropriate amount of air for combustion of the first burner 1 is continuously varied and supplied. At this time, the rotation speed of the blower 18 has a maximum set value when the first burner 1 reaches the maximum combustion amount.

Next, when the hot water supply output is 30,000 kcal / h or more (b-c shown in FIG. 3), the first burner 1 burns at the maximum combustion amount, and at the same time, the second burner 2 stays constant. Combustion and extinguishing are repeated according to the hot water supply output by the fuel spray amount, and the air volume from the blower is varied stepwise according to the combustion and extinguishing.

That is, in this case, the air supply damper 22 is moved backward by the solenoid valve 23 in the blower 18 to open the blower port 18a. As a result, the blower 18 increases the amount of air required for combustion of the second burner 2 (part e in FIG. 4) and starts supplying the air.

Then, after a lapse of a predetermined time, the ignition transformer 16 operates and the ignition electrode 14 starts discharging, and then the electromagnetic pump 12 pumps the fuel to the nozzle 11 side through the fuel branch pipe 13. As a result, a certain amount of fuel sprayed from the tip of the nozzle 11 is ignited by the discharge from the ignition electrode 14 and burned. When the combustion is started in this way, the flame monitoring device 15 detects the combustion flame, the ignition transformer 16 is stopped after a predetermined time, and the second burner 2 continues the combustion.

Further, the combustion of the second burner 2 continues to reach the required combustion amount calculated by the controller unit 31 as described above, or the hot water temperature reaches the temperature set by the operation unit 32. When the hot water supply temperature detector 30 detects this, the electromagnetic pump 12 is stopped and the second burner 2 extinguishes the fire. At the same time, the air supply damper 22 is moved to the original position, and the blower opening 18a is closed.

In this way, the air volume from the blower 18 is changed stepwise in accordance with the combustion and extinction of the second burner 2, and the air volume is returned to an appropriate volume corresponding to the maximum combustion of the first burner 1. You At this time, the rotation speed of the blower 18 has already reached the set maximum, and the air amount changes only by opening / closing the air supply damper 22, so the air amount corresponding to the combustion / extinction of the second burner 2 is changed. Change (transition between d and e shown in FIG. 4) is performed promptly, and the burner combustion performance is not impaired.

Further, as a result of continuing the hot water discharge from the faucet 33, when the hot water discharge temperature falls below the temperature set by the operation unit 34 by a predetermined temperature, the second burner 2 restarts combustion.

Therefore, according to the water heater as described above, even when TDR is set to 1/5, the minimum hot water output by the first burner is about 6,000 kcal / h, so that it can be used in kitchens, washrooms, etc. It can also be used for small amounts of hot water.

Moreover, when the hot water supply output is 30,000 kcal / h or less, the combustion amount of the first burner continuously changes according to the hot water supply output, so that the temperature of the set hot water is constant. You can get hot water. On the other hand, for hot water supply output of 30,000 kcal / h or more under the usage conditions of hot water in ordinary households, it is not necessary to worry about slight fluctuations in hot water temperature at the time of dropping into a bathtub. Therefore, with this water heater, the burner can be treated as if it burns continuously with the required combustion amount for hot water output from a maximum of 40,000 kcal / h to a minimum of 6,000 kcal / h.

In addition, in this water heater, when the second burner burns and extinguishes, the first burner has already burned to the maximum extent, so noise at the time of ignition in the second burner is not noticeable.

Further, according to this water heater, since the combustion air can be supplied to the first and second burners by one blower, it is not necessary to prepare two blowers and the like, so that the number of parts is reduced. It is possible to provide a water heater with a simple structure. Moreover, since the structure is simple, such a water heater is inexpensive, has few failures, and has excellent achievement capabilities and functions.

[0047]

[Effect of the device]

 Since the instant oil hot water heater according to the present invention is equipped with the first burner and the second burner as described above, the maximum hot water output by the first burner is 30,000 kcal / h and the second burner is By setting the maximum hot water supply output to 10,000 kcal / h, even if the total maximum hot water supply output is 40,000 kcal / h, the minimum hot water output by the first burner is about 6,000 kcal / h, so it can be used in kitchens. It supports a wide range of hot water supply output from small amount of hot water in a washroom to large amount of hot water such as dropping into a bathtub, improving usability in terms of use.

In particular, according to the third aspect of the invention, when the hot water supply output is 30,000 kcal / h or less, only the first burner operates, so that the first burner changes the combustion amount according to the hot water supply output. Since it changes continuously, hot water with a constant temperature can be obtained against the set hot water even when a small amount of hot water is discharged, improving usability in terms of hot water temperature stability.

Further, according to the invention of claim 4, since the combustion air can be supplied to the first and second burners by one blower, it is not necessary to prepare two blowers and the like. The number of water heaters is reduced, and a water heater with a simple structure can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram for explaining an oil instant water heater according to the present invention.

FIG. 2 is a cross-sectional view of essential parts of a blower in the water heater shown in FIG.

FIG. 3 is an explanatory view showing a relationship between a hot water supply output and a combustion air amount of the water heater according to the present invention.

FIG. 4 is a schematic configuration diagram for explaining a conventional oil instantaneous water heater.

[Explanation of symbols]

 1 1st burner 2 2nd burner 18 Blower 22 Air supply damper 23 Solenoid valve 24 Opening 31 Controller part

Claims (4)

[Scope of utility model registration request] 1. A first burner that burns continuously with a fuel spray amount that changes according to the hot water supply output, and a first burner that is installed next to the first burner and that provides a hot water supply output with a constant fuel spray amount. A second burner that repeats combustion and extinguishment in response to the first burner; a first combustion air supply unit that continuously varies the air flow rate according to the fuel spray amount of the first burner; An oil instantaneous hot water supply device, comprising: a second combustion air supply means for gradually changing the air volume according to fire extinguishing. 2. The maximum hot water supply output by the first burner is about 3
0,000 kcal / h, maximum hot water output by the second burner is about 10,
It is 000 kcal / h, The oil instantaneous water heater of Claim 1 characterized by the above-mentioned. 3. When the hot water supply output is 30,000 kcal / h or less, only the first burner is operated and the hot water supply output is 30,000 kc.
The oil instantaneous water heater according to claim 2, further comprising a controller unit that operates the second burner at the same time as the first burner at al / h or more. 4. The first and second combustion air supply means,
It consists of one blower, an air supply damper located on the side of the air blower of the blower and having an opening facing the air blower, and one solenoid valve that moves the air supply damper back and forth toward the air blower. The oil instantaneous water heater according to claim 1, characterized in that.