JP2022085059A - Boiler device - Google Patents

Abstract

To provide a boiler device capable of rapidly adjusting a hot water delivery temperature to a set temperature even when a hot water supply demand is increased.SOLUTION: One of a plurality of boilers A functions as a master boiler A1, and the others function as slave boilers A2-A4. At first, a hot water delivery temperature is set to be at a set temperature by the master boiler A1, and slave boilers A2-A4 simultaneously start the operation in the case where the hot water delivery temperature does not reach the set temperature even when a heating power command of the master boiler A1 reaches an upper limit, and the hot water delivery temperature is raised at once to the set temperature by the master boiler A1 and the slave boilers A2-A4.SELECTED DRAWING: Figure 3

Description

The present invention relates to a technique for controlling the hot water temperature to a set temperature by a plurality of boiler devices.

Conventionally, there has been known a technique of heating and controlling hot water in demand to a set temperature by using a plurality of boilers. The merit of using multiple boilers is that the capacity of each boiler can be reduced. Therefore, for example, when one boiler is configured to cover the entire range of hot water output, when the amount of hot water is low. It is conceivable that it is possible to prevent a decrease in efficiency.

As a technique using such a plurality of boilers, the boiler interconnection system described in Patent Document 1 below can be exemplified. The configuration and operation of the boiler interconnection system will be briefly described below.

Japanese Unexamined Patent Publication No. 2016-125690

The boiler interconnection system includes a water supply pipe, a hot water supply pipe, five heat source devices, and a controller. A flow rate sensor capable of detecting the flow rate of water flowing through the water supply pipe is installed in the water supply pipe.

The heat source device bypasses the burner, the first heat exchanger in which the heat medium is heated by the burner by the combustion heat of the burner, the pump that circulates the heat medium in the first heat exchanger, and the heat medium that has passed through the first heat exchanger. It is roughly configured with a bypass pipe, a second heat exchanger attached to the bypass pipe, and a hot water outlet pipe connected to the second heat exchanger.

The water for hot water supply flows into the second heat exchanger from the water supply pipe. The heat medium flows into the first heat exchanger by the operation of the pump. When the burner is burning, the heat medium heated by the first heat exchanger flows into the second heat exchanger attached to the bypass tube.

The heat medium flowing through the second heat exchanger heats the water supplied from the water supply pipe. The water heated by the second heat exchanger is discharged to the hot water outlet pipe.

Each of the five heat source devices has the above configuration. Normally, two of them are stopped and the remaining three are operated to meet the demand for hot water supply.

In the boiler interconnection system, when a hot water supply request occurs, the controller detects the flow rate (flow rate) of water in the water supply pipe by a flow rate sensor. If the amount of flowing water is less than a predetermined value, as described above, three of the five heat source devices are operated to control the hot water temperature to the set temperature.

On the other hand, when the flow rate sensor detects that the amount of water flowing through the water supply pipe exceeds a predetermined value, the pumps of the two stopped heat source devices are operated and the burners are ignited and burned.

As a result, when the heat medium flows into the first heat exchanger in the two heat source devices that have started operation, it is heated by the combustion heat of the burner through the first heat exchanger, and then is provided in the bypass pipe. It flows into the second heat exchanger.

On the other hand, since the water supplied from the water supply pipe flows through the second heat exchanger, it is heated by the heated heat medium flowing into the second heat exchanger as described above. The water heated by the second heat exchanger flows out to the hot water outlet pipe.

As described above, according to the boiler interconnection system, when a refueling demand exceeding a predetermined value occurs, hot water is used by starting the operation of the stopped heat source device and using all the heating capacities of the five heat source devices. Since it is configured to heat the hot water, it is possible to quickly heat the hot water to a set temperature.

In addition, when the demand for hot water supply exceeds a predetermined value, the hot water outlet temperature can be quickly heated to the set temperature by operating all the heat source devices. Therefore, for example, the heating capacity of the hot water outlet by each heat source device is limited. Compared to the method of increasing the number of heat source devices to be operated each time the temperature is reached, there is an advantage that the time required to heat the hot water to the set temperature can be shortened.

As described above, the boiler interconnection system requires a flow rate sensor as a component thereof. However, since the flow rate sensor is relatively expensive, a boiler device incorporating this as an essential element has a demerit that the cost of the device increases, as a matter of course.

Therefore, an object of the present invention is to provide a boiler device that can realize heating up to a set temperature of hot water in a short time without using a flow rate sensor as a component.

The invention according to claim 1 circulates a can body for storing can water, a burner for heating the can water, and a heat medium flow pipe connected to the can body and the outside of the can body. A pump, a temperature sensor for measuring the can water temperature that measures the temperature of the can water flowing in the heat medium flow tube, and a heat exchanger attached in the middle of the heat medium flow tube are connected via the heat exchanger. Measurement temperature information is detected from the inlet pipe and the outlet pipe, the temperature sensor for temperature measurement for the outlet pipe that measures the water temperature in the outlet pipe, the temperature sensor for measuring the can water temperature, and the temperature sensor for temperature measurement for the outlet pipe. A plurality of boilers including a controller for controlling the heating power command to the burner and the drive / stop of the pump are provided, and the temperature of the hot water flowing in the hot water discharge pipe is controlled by the plurality of boilers. First, the master boiler makes the hot water temperature the set temperature so that one of the boilers functions as the master boiler and the other boiler functions as the slave boiler, and the hot water temperature flowing in the hot water pipe becomes the set temperature. When the thermal power command to the burner is controlled and the thermal power command of the master boiler reaches the upper limit, the thermal power command of the slave boiler is controlled at the same time so that the hot water temperature flowing through the hot water pipe reaches the set temperature at an early stage. It has characteristics.

According to the second aspect of the present invention, in the boiler device according to the first aspect, after the hot water discharge temperature in the hot water discharge pipe reaches the set temperature, the number of operating slave boilers is reduced to maintain the hot water discharge temperature at the set temperature. It is characterized by doing.

According to the invention of claim 1, it is possible to reach the set temperature at an early stage without using an expensive flow rate sensor.

According to the invention of claim 2, in addition to the effect of claim 1, after the hot water temperature reaches the set temperature, the hot water temperature is maintained at the set temperature by reducing the number of slave boilers in operation. Can be done.

It is a block diagram of the master boiler or each slave boiler which constitutes the boiler apparatus of this invention. It is an electric system block diagram of the master boiler or each slave boiler. It is a connection configuration diagram of the master boiler or each slave boiler. It is a graph which shows the relationship between the thermal power command control of the master boiler and the slave boiler which make up the boiler apparatus which concerns on this invention, and the hot water temperature.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 shows the configuration of each boiler (master boiler or slave boiler) A constituting the boiler device of the present invention.

In FIG. 1, 1 is a water storage can for holding water (canned water) to be used as a heat medium, and 2 is a supply pipe for replenishing canned water in the water storage can 1. Reference numeral 3 is a replenishment solenoid valve provided in the replenishment pipe 2 for switching between water supply and water stoppage, which is automatically opened and closed by a water supply function described later, and is controlled so that a certain amount of water is always stored in the water storage can 1. To.

Reference numeral 4 is a heat medium flow pipe that communicates with the inside of the water storage can 1 and circulates the can water in the water storage can 1 outside the water storage can 1. It is a circulation pump for circulating water.

Reference numeral 6 is a temperature sensor for measuring the temperature of the pipe water attached to the heat medium flow tube 4, and reference numeral 7 is a heat exchanger provided on the heat medium flow tube 4.

Reference numeral 8 is a burner for heating the can water in the water storage can 1 from the outside of the water storage can 1, and reference numeral 9 is a fuel supply pipe for supplying fuel to the burner 8. Reference numeral 10 is attached to the fuel supply pipe 9 and indicates a fuel control solenoid valve for switching between supply and stop of fuel to the burner 8.

Reference numeral 11 is an air supply pipe for supplying the air required for combustion to the burner 8, and reference numeral 12 is an air supply solenoid valve for switching between supplying and stopping the air to the burner 8.

Reference numeral 13 is a water inlet pipe in which the heat exchanger 7 is arranged at an intermediate position, and reference numeral 14 is a hot water outlet pipe connected to the water inlet pipe 13 via the heat exchanger 7. Reference numeral 15 is attached to the hot water outlet pipe 14, and indicates a temperature sensor for measuring the hot water discharge pipe temperature.

Reference numeral 16 detects the water levels in the electromagnetic valves 3, 10 and 12 constituting the boiler device A and the water storage can 1 based on the command signal from the operation panel described later and the temperature information from the temperature sensors 6 and 15. A controller for controlling various control devices constituting the boiler device A, such as a water level sensor (not shown), a burner 8, and a circulation pump 5, is shown.

Reference numeral 17 denotes a remote controller that outputs a command signal to the controller 16, which is operated for the purpose of controlling various control devices constituting the boiler device A, similarly to the operation panel.

FIG. 2 is an electrical system configuration diagram illustrating an electrical connection state of the controller 16 shown in FIG. 1 and its peripheral devices. As shown in FIG. 2, the controller 16 commands a control power supply unit 19 connected to an external power supply 18, a control unit 20 that operates by receiving a control power supply from the control power supply unit 19, and a control unit 20. It is roughly configured from an operation panel 21 that outputs a signal.

The operation panel 21 is provided with various display units, setting units, and the like, as well as an operation unit for inputting instruction information output to the control unit 20 by the operator.

The control unit 20 is instructed to be controlled by the remote controller 17 in addition to the operation panel 21. An external power supply 22 is separately supplied to the remote controller 17. The configuration of the remote controller 17 is almost the same as the function provided in the operation panel 21 described above, but as shown in FIG. 2, the remote controller 17 has a plurality of boilers (only two are displayed in FIG. 2). Since A is connected, switches and the like that enable the operation of a plurality of boilers A by one remote controller are separately provided.

When command signals, various setting signals, or various sensor information such as temperature sensors 6 and 15 connected to the sensor contacts 23 are input to the control unit 20 from the operation panel 21 or the remote control 17, the control unit 20 is input. Various settings are executed based on the set information, and the control device 24 is controlled according to the input command signal. Examples of the control device 24 include solenoid valves 3, 10 and 12 shown in FIG. 1, a water level sensor (not shown) for detecting the water level in the water storage can 1, a burner 8, a circulation pump 5, and the like.

FIG. 3 illustrates how each boiler (master boiler, slave boiler) A related to the boiler device of the present invention is physically connected. As shown in FIG. 3, in the boiler device of the present invention, a plurality of boilers A having the configuration shown in FIG. 1 (four in FIG. 3) are connected in series.

That is, as shown in FIG. 3, a boiler device A having the same configuration as the boiler A shown in FIG. 1 connecting the water inlet pipe 13 to the hot water outlet pipe 14 shown in FIG. 1 is arranged, and the boiler device A connected in this way is also arranged. A boiler device A having the same configuration in which the water inlet pipe 13 is connected to the hot water outlet pipe 14 of A is further connected.

In this way, by connecting a plurality of boilers A in series, the hot water outlet temperature is controlled to be a set temperature by the plurality of boilers A. Further, in the present invention, one of the plurality of boilers A is used as a master boiler, and the other is used as a slave boiler.

Various methods can be used to determine which boiler is to be the master boiler or the slave boiler. For example, the boiler that is first turned on may be made to function as the master boiler. When one boiler is set as the master boiler in this way, the other boilers are automatically set and function as slave boilers.

Subsequently, the operation of the boiler device of the present invention will be described. First, each boiler A shown in FIG. 3 stores a certain amount of canned water in the water storage can 1 when the power is turned on in preparation for the demand for hot water supply. At this time, as described above, for example, the boiler A that is first turned on functions as the master boiler A1, and the others function as the slave boilers A2 to A4.

The water level in the water storage can 1 of each boiler A1 to A4 is monitored by a water level sensor (not shown), and the opening and closing of the replenishment solenoid valve 3 is automatically switched. When the water level of the can water becomes higher than the standard water level, the replenishment solenoid valve 3 is closed to stop the water, and when the water level becomes low, the replenishment solenoid valve 3 is opened to supply water into the water storage can 1. (Water supply function). The water supply function may be provided with a function of determining that the water supply valve is abnormal when a low position of the water level is continuously detected for a certain period of time or longer.

Further, the canned water in the water storage cans 1 of the boilers A1 to A4 is preheated to a predetermined temperature in preparation for the demand for hot water supply. Specifically, when the fuel control solenoid valve 10 is opened, fuel is sent to the burner 8 through the fuel supply pipe 9, and by opening the air supply solenoid valve 12, combustion air is sent to the burner 8.

After that, by controlling the ignition of the burner 8, the can water in the water storage can 1 is warmed to a predetermined temperature by the combustion of the burner 8. Whether or not the can water temperature has reached a predetermined temperature is determined by driving the circulation pump 5 to circulate the can water through the heat medium flow tube 4, and transfer the circulating can water temperature to the heat medium flow tube 4. The temperature is controlled by the control unit 20 by detecting the temperature on the attached can water temperature measurement temperature sensor 6 and transmitting the detection result to the control unit 20 of the controller 16.

The above preparations are carried out before the hot water supply demand is generated, and when the hot water supply demand is generated, first, the hot water outlet temperature is heated to the set temperature by one master boiler A1. There are two functions for controlling the hot water temperature, that is, the hot water temperature control function and the can water temperature control function.

The hot water temperature control function controls the flow rate of the circulation pump 5 and adjusts the hot water temperature to a set temperature. The hot water outlet temperature outputs the measured temperature information detected by the hot water outlet pipe temperature measurement temperature sensor 15 to the control unit 20 of the controller 16. Upon receiving the information, the control unit 20 further controls the flow rate of the circulation pump 5 so that the hot water temperature approaches the set temperature. By repeating the above operation, the hot water temperature is adjusted to the set temperature.

The can water temperature control function controls the thermal power of the burner 8 and adjusts the temperature of the can water circulating in the heat medium flow tube 4 to be a constant temperature higher than the set temperature. The can water temperature circulating in the heat medium flow tube 4 outputs the measurement temperature information detected by the can water temperature measurement temperature sensor 6 to the control unit 20 of the controller 16. Upon receiving the information, the control unit 20 further controls the thermal power of the burner 8 to control the hot water temperature to approach the set temperature. By repeating the above operation, the can water temperature is adjusted to the set temperature.

By executing the above-mentioned hot water temperature control, the water in the water inlet pipe 13 shown in FIG. 1 is heated to a set temperature by the heat exchanger 7 and is discharged from the hot water outlet pipe 14. The hot water that is heated to the set temperature in this way meets the user's demand for hot water supply.

Next, the operation when the demand for hot water supply increases in the situation where the above operation is executed will be described. When the hot water supply demand increases, the boiler device of the present invention first heats the hot water outlet temperature to a set temperature that can meet the hot water supply demand by the master boiler A1 alone.

If the master boiler A1 alone can heat the hot water temperature to the set temperature, the slave boilers A2 to A4 will not operate. However, if the hot water temperature does not reach the set temperature even when the thermal power command of the master boiler A1 reaches the upper limit, in the present invention, as shown in FIG. 4, the slave boilers A2 to A4 that have been stopped are simultaneously used. By operating, the hot water temperature is heated to the set temperature at once.

Then, after the hot water outlet temperature reaches the set temperature, the number of operating units of the slave boilers A2 to A4 is controlled to reduce the number of operating units of the slave boilers A2 to A4, and the hot water outlet temperature is controlled to be maintained at the set temperature. ..

At this time, the hot water temperature control of each of the boilers A1 to A4 is executed by the hot water temperature control function and the can water temperature control function described above. Unlike conventional techniques, hot water temperature control using this function can heat the hot water temperature to a set temperature in response to an increase in hot water supply demand without the need for a flow rate sensor, reducing equipment costs. can.

Further, also in the present invention, as in the prior art, after the thermal power command of the master boiler A1 reaches the upper limit, the slave boilers A2 to A4 are sequentially started to operate, and the number of boilers (heat source devices) in the operating state is increased. It is possible to heat the hot water temperature to the set temperature in an extremely short time as compared with the method of heating.

In the above description, the case where the number of slave boilers is three is exemplified, but it is natural that the scope of the present invention is not limited to this number.

As described above, according to the boiler device of the present invention, the flow rate of the circulation pump for canned water can be controlled and the thermal power of the burner can be controlled even when the demand for hot water supply increases without using an expensive flow sensor. By doing so, the hot water temperature can be adjusted to the set temperature, and the adjustment time to the set temperature can be performed in an extremely short time.

It can be applied to a boiler device consisting of multiple boilers.

1 Water storage can 2 Replenishment pipe 3 Replenishment electromagnetic valve 4 Heat medium flow pipe 5 Circulation pump 6 Pipe Water temperature measurement temperature sensor 7 Heat exchanger 8 Burner 9 Fuel supply pipe 10 Fuel control electromagnetic valve 11 Air supply pipe 12 Air supply Electromagnetic valve 13 Water inlet pipe 14 Hot water pipe 15 Hot water pipe Temperature sensor for temperature measurement 16 Controller 17 Remote control 18, 22 External power supply 19 Control power supply unit 20 Control unit 21 Operation panel 23 Sensor contact 24 Control equipment A Boiler (master boiler A1, Slave boiler A2)

Claims (2)

A can body that stores can water, a burner that heats the can water, a pump that circulates the can water between the can body and a heat medium flow pipe connected to the outside of the can body, and a inside of the heat medium flow pipe. A temperature sensor for measuring the can water temperature that measures the temperature of the can water flowing through the boiler, a heat exchanger attached in the middle of the heat medium flow pipe, a water inlet pipe and a hot water outlet pipe connected via the heat exchanger, and the like. The measured temperature information is detected from the temperature sensor for measuring the temperature of the hot water pipe that measures the water temperature in the hot water pipe, the temperature sensor for measuring the can water temperature, and the temperature sensor for measuring the temperature of the hot water pipe, and the thermal power command to the burner is given. It is configured to have a plurality of boilers provided with a controller for controlling the drive / stop of the pump, and the temperature of the hot water flowing in the hot water discharge pipe is controlled by the plurality of boilers, and one of the plurality of boilers functions as a master boiler. Then, the other boiler functions as a slave boiler, and the master boiler first controls the thermal power command to the burner so that the hot water temperature becomes the set temperature so that the hot water temperature flowing in the hot water pipe becomes the set temperature. A boiler device characterized in that when the thermal power command of the master boiler reaches the upper limit, the thermal power command of the slave boiler is simultaneously controlled so that the hot water temperature flowing through the hot water pipe reaches the set temperature at an early stage. The boiler device according to claim 1, wherein after the hot water discharge temperature in the hot water discharge pipe reaches a set temperature, the number of operating slave boilers is reduced to maintain the hot water discharge temperature at the set temperature.

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