JPH02208420A - Control apparatus for heater - Google Patents

Abstract

PURPOSE:To enable a comfortable and economical heating operation by permitting a burner to carry out a combustion operation by means of operation signals issued from indoor side control devices, allowing a combustion rate to be varied in accordance with the number of the operation signals and opening heat medium supply valves corresponding to the operation signals. CONSTITUTION:When any of indoor side control devices 29A, 29B... adapted to heat radiators 26A, 26B..., respectively, emits an operation signal, a heat source side control device 16 permits a burner 2 to effect a combustion operation. Further, the magnitude of a heating load is judged in accordance with the number of operation signals, and a combustion rate of the burner 2 is adjusted by a proportional control valve 14. Furthermore, heat medium supply valves 10, 11... corresponding to the operation signals are opened, and heat mediums which have been heated are supplied only to the heat radiators 26A. 26B... which need heating, and the combustion rate of the burner 2 is suitably regulated according to the heating load. Thus, the comfortable and economical heating operation can be effected.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a control device for a heater that performs heating by circulating a heat medium of a heat exchanger heated by a burner through a plurality of radiator bombs.

(Example) Conventional technology This type of conventional heating machine is known, for example, from Japanese Patent Application Laid-Open No. 56-1335.
As disclosed in Publication No. 40, a heat exchanger built in a heat source device and heated by a burner, a circulation pump, and a plurality of branch passages each having a heat medium supply valve and a radiator are connected in an annular manner. The burner and circulation pump are operated by the operation signal from the radiator, and the heat medium supply valve is opened to supply the heat medium (water, antifreeze, etc.) from the heat exchanger to the radiator. There are known devices that heat the room by supplying it with air.

(C) Problems to be Solved by the Invention By the way, in the above-mentioned heater, a normally closed thermal valve or electric valve is used as the heat medium supply valve of the branch path, so a radiator that does not require heating cannot be used. There is an advantage that no heat medium is supplied and wasteful heat radiation can be prevented. However, since the amount of combustion in the bath is constant regardless of the number of radiators in operation, not only does the hot air temperature change depending on the number of radiators in operation, but when the number of radiators in operation is small, the heat exchanger There have been problems in that the temperature of the heat medium in the burner increases excessively, causing the burner to repeatedly start and stop combustion, and when a large number of burners are in operation, the room temperature does not easily reach the desired temperature.

This invention was made in view of the above facts,
The purpose of this system is to realize comfortable and economical heating operation in a device that circulates the heat medium of a heat source device to multiple radiators.

(d) Means for Solving the Problems The heating machine control device of the present invention includes a heat exchanger built in a heat source device and heated by a burner, a circulation pump, a heat medium supply valve, and a radiator. In a heating system in which a heat medium circulation path is formed by connecting a plurality of branch paths in an annular manner, an indoor control device that is installed in each of the plurality of radiators and issues an operation signal according to the heating load; It causes the burner to perform combustion when there is an operation signal from the indoor control device, and changes the combustion amount of the burner according to the number of operation signals.
The configuration also includes a heat source side control device that opens a heat medium supply valve corresponding to each operation signal.

In addition, in such a control device for a heater, the heat source side control device includes means for causing the burner to perform strong twist firing regardless of the number of operation signals from the start of combustion in the burner until a predetermined time has elapsed. This is a configuration in which

(*) Effect When any of the indoor control devices installed in each of the plurality of radiators issues an operation signal, the heat source side control device causes the burner to perform combustion, and also controls the heating load according to the number of operation signals. determine the size of the burner and adjust the burner combustion amount. Also, the heat medium supply valve corresponding to the operation signal is opened. Therefore, not only is the heated heat medium supplied only to the radiators that require heating, but the combustion amount of the burner is appropriately adjusted according to the heating load, and the hot air temperature and heat of each radiator are adjusted accordingly. Comfortable and economical heating operation is performed without worrying that the medium temperature will vary greatly depending on the overall heating load.

Moreover, in the control device for a heater according to the second aspect, since strong twisting is performed at the beginning of combustion in the burner regardless of the number of radiators in operation, ignition is always performed well and the room temperature rises quickly.

(f) Example Hereinafter, embodiments of the present invention shown in the drawings will be described.

In Figure 3, (1) is a heat source machine installed outdoors, and the heat source m(1) includes a burner (2) and this burner (2).
) and a heat exchanger (3) heated by the exhaust fan (
4), a heat medium tank (5), and this heat medium tank (5).
), a reserve tank (8) connected to a heat medium tank 5) via a pressure regulating valve <7) of a radiator cap (6) attached to a circulation pump (9), and two normally closed heat medium The supply valves (10) (11), the gas pipe (12) connected to the burner (2>), the cutoff valve (13) and proportional control valve (14>) provided on the gas pipe (12), and the burner ( 2
) and a heat source side control device (16) are built in. In addition, two piping connection ports (17) (18), a return side header (19), a heat exchanger (3), a heat medium tank (5), a circulation pump (9),
Outgoing header (20), two heat medium supply valves (10)
(11), and two piping connection ports (21) and (22) are sequentially connected by piping, and heat is generated by these. jX machine (1)
It constitutes the side heat medium circulation path (C). Further, a liquid supply port (23) is provided in the upper part of the heat medium tank (5), and a check valve (24) is built into this liquid supply port (23). This check valve (24) is operated under pressure in the direction of the arrow (for example, 0
, 3 kg/(-m1 or more), the heat medium is allowed to flow in that direction, and the flow of the heat medium in the opposite direction to the arrow is blocked. (25A) (25B)
are indoor units such as fan convectors installed indoors.
), a room temperature thermistor (28A) (28B), and an indoor control device (29A) (29B) are built in. The radiator (26A) (26B>
) is connected to the heat medium circulation path (C;).

FIG. 1 shows the internal configuration of the control unit of the heater described above, and the indoor control device (29A) (29B) includes operation switches (30A) (30B) and a room temperature thermistor (28
A) Room temperature detected by (28B) and temperature setting device (31A)
(31B), and if the room temperature is lower than the set temperature, thermo switch (32A) (3
Room temperature control circuit (33A) to turn on 2B) (33B)
, fan motors (34A) (34B) for driving the ventilation fans (27A) (27B) whose energization is controlled by the operation switch and the thermo switch, and the relay (35A).
) (35B).

On the other hand, the heat source side control device (16) is connected to the relay (35A) (3
Relay contact (351A) (351
Input the contact signal (operation signal) of B) and turn on the indoor unit (25A
) (25B) is in operation, and when this operating number determining device (36) determines that the number of operating units is one or more, it issues a combustion command, and the exhaust fan (4) Drive fan motor (37), cutoff valve (13)
), a combustion control device (38) that energizes the proportional valve (14) and the ignition device (15) in a predetermined sequence, and operates the circulation pump (9) in response to a pump operation command from the combustion control device (38). a supply valve control device (40) that energizes and opens the heat medium supply valves (10) and (11) in accordance with a determination signal from an operation number determination device (36); Contact (351A) (351
A proportional valve control device (41) is provided which inputs the output signal of the operating number determination device (36) according to the number of inputs of B> and adjusts the valve opening degree of the proportional valve (14). In addition, the proportional valve control device (41) has a proportional Valve (14
) has a built-in timer means (T) for increasing the opening degree of the valve and causing the burner (2>) to carry out strong combustion.

No. 2150 is a bag to determine the number of vehicles in operation! (36), the internal circuits of the pump drive device (39), the supply valve control device (40), and the proportional valve control device (41). The operating number control device (36) includes a relay switch (351A) and a resistor (4
2), constant voltage element (43), and relay switch
351B), a series circuit of a resistor (43) and a constant voltage element (45), a NAND circuit (48) that receives the voltage signal of the connection point (46) < 47), and the output of this NAND circuit (48). An inverter (49) that inverts and a connection point (50) (5
Two diodes (52) (5) supply the H1' voltage signal of 1) to the input terminal (IP) of the combustion control device (38).
3). The supply valve control device (39) includes a transistor (54), a relay (55) for controlling the heat medium supply valve (10) connected in series with the transistor (54), a transistor (56), and a relay (55) connected in series with the transistor (54). Consists of a relay (57) for controlling the heat medium supply valve (11),
The bases of the transistors (54) and (56) are connected to the connection point (46).
) (47). In addition, the pump drive device (
39) is a transistor (57) to which a pump operation signal is supplied from the output terminal (OPI) of the combustion control device (38), and a relay (39) for controlling the pump (9) connected in series with the transistor (57).
58). In addition, the proportional valve control device (4
1) includes an inverter (59) cascaded with an inverter (49);
A transistor (6) provided on the output side of the inverter (59)
0), a resistor (61) or 63) connected in series, and an operational amplifier (65) whose input is the voltage at the connection point (64) of the resistors (61) and (62); A transistor (66) provided on the output side, a proportional valve (14) and a resistor (67) connected to the collector side and emitter side of the transistor (66), respectively, and a diode (68) as a timer means (T). , resistance (69) (
70) and a capacitor (71), and a timer means (T)
An inverter (72) and a diode (73) provided between the output end of the inverter (59) and the input end of the inverter (59);
9) and a diode (74) provided between the output end of the timer means (I), and the input end of the timer means (T) receives an "H" signal during ignition and combustion.
In addition, the connection to the output terminal (OF2) of the combustion control device (38) to which the "L u signal is output at other times is incorrect, and the base of the transistor (66) is also connected to the output terminal (OF2) through the diode (75). ”2). Further, the transistor (60) is connected in parallel to the resistor (63).

When only the operation switch (30A) of indoor a (25A) is turned on and the thermo switch (32A) is turned on, the fan motor (34A) is energized and the blower fan (2
7A) will drive. Further, the relay switch (351A) is closed by energizing the relay (35A). At this time,
In the operation number determination device (36) of the heat source side control device (16), a constant voltage is generated at the connection point (46) and the transistor (
54) is turned on, the relay (55> is energized, and the heat medium supply valve (10) is opened. Also, the power supply terminal (75)
The voltage Vc is applied to the input terminal (38) of the combustion control device (38) via the relay switch (351A) and the diode (52).
The combustion control device 38) first starts the fan motor (37) for driving the exhaust fan (4) to cause the burner (2) to perform buri-purge, and also outputs the output terminal (OPI). ) issues a pump operation signal to turn on the transistor (57), energizes the relay <58) to start the circulation pump (9>).Next, the combustion control device (38) activates the ignition device (15). , open the shutoff valve (13).At the same time, open the output terminal (OF2).
) changes the output from "L 91" to "H", turns on the transistor (66) of the proportional valve control device (41), and connects the resistor (71) to the capacitor (71) of the timer means).
69). At this time, the operation number determination device (36) determines that the two-man power of the NAND circuit (48) is “
H” and 1L”, its output is H” and the inverter (
49) output is L. However, until the capacitor (71) is sufficiently charged, the inverter (71)
2) is "H" and this output is input to the inverter (59), so the output of the inverter (59) is "L" and the transistor (60) is off.Then, the operational amplifier The high voltage of the connection point (64) is input to (65),
Since the output voltage becomes higher and the degree of conductivity of the transistor (66) becomes larger, the current flowing through the proportional valve (14) becomes larger, and the valve opening also becomes larger.

Therefore, the burner (2) starts combustion with strong twist firing.

After that, when a predetermined period of time has passed and the capacitor <71> has been sufficiently charged, the input of the inverter (72) becomes "H".
The output becomes "L". At this time, the "L" output of the inverter (49) is input to the inverter (59), and the inverter (59) receives the "L" output of the inverter (49).
9) becomes H", the transistor (60) is turned on, and the voltage at the connection point (64) is reduced. Therefore, the conductivity of the transistor (66) is reduced, and the proportional valve (14) is turned on. The valve opening of the burner (2) becomes smaller and weak combustion occurs in the burner (2).In addition, current flows to the capacitor (71) via the diode (74) and the resistor (70), charging the capacitor (71). Complete your turn quickly.

In this way, when the circulation pump (9) is operated based on the operation signal of the indoor controller (29A) and combustion is performed in the burner 2), the heat medium heated by the heat exchanger (3) is Heat medium tank (5), circulation pump (9), outgoing header (20), heat medium supply valve (10), and piping connection port (
21), enter the branch path (CI), and enter the radiator (26).
A). And here, the blower fan (27A)
After exchanging heat with the indoor air sent in and being used for indoor heating, the piping connection port (17) and the return header (
19> and returns to the heat exchanger (3), repeating the circulation indicated by the solid arrow. At the beginning of heating, the burner (2) is strongly twisted regardless of the number of relay switches turned on, so not only is ignition performed well, but the heat medium temperature is rapidly raised, making it difficult to install a radiator (26A). The room temperature rises quickly in the room where the heat is poured.In addition, only the heat medium supply valve 10) is opened in response to the relay switch (351A), and the heat radiator (26B) is opened.
) This prevents unnecessary heat radiation. In addition, after a predetermined period of time has passed from the start of heating operation, the burner (2) performs weak combustion and the amount of combustion is commensurate with the heating load, so the temperature of the hot air in the radiator (26A) may rise extremely. As the temperature of the heat medium increases, the temperature control device for the heat medium operates, and the burner does not repeatedly start and stop.

When only the operation switch (30B> of the indoor control device (29B) is turned on, the thermo switch (32B) is turned on, and an operation signal is issued from the indoor control device (29B) to the heat source side control device) The same is true; in this case,
The heat medium supply valve (11) is opened. And a heat exchanger (
3) The heat medium is connected to the heat sink (26B>) as shown by the broken line arrow.
The heat is circulated through the air and used to heat the room where the radiator (26B) is installed. Moreover, the burner (2>) performs strong twist firing for a predetermined time and then performs weak combustion.

Indoor control device (29A) (29B> operation switch (
30A) (30B) are both turned on and the thermo switch (32A) (32B) is turned on, the relay switch (351A>(351B) is turned on. In this case, the heat source side control device 16) (55) (57)
is energized, and the heat medium supply valves (10) and (11) are opened. Therefore, the heat medium of the heat exchanger (3) circulates to the radiators (26A) (26B) as shown by solid and broken arrows, and is used to heat the room where the radiators (26A) (26B) are installed. used. In addition, both of the two outputs of the NAND circuit (48) become ``H'' and their output becomes ``L'', so the input of the inverter (59) becomes ``H'' regardless of the output of the timer means (T). , and the transistor (60) is turned off. Then, the input of the operational amplifier (65) is increased, the amount of current supplied to the proportional valve (14) is increased, and strong twist firing is performed in the burner (2).

In this way, when the operation signals are sent from the indoor side control devices (29A) (29B) to the heat source side control device (16) at the same time, the combustion amount of the burner (2) increases, so each radiator (26A) It is possible to prevent the temperature of the hot air from decreasing in (26B), and it is possible to quickly raise the room temperature to the set temperature.

When the operation switch (30A) (30B) or thermo switch (32A) (32B> is turned off) and the relay switch (351A) (351B) is turned off, the blower fan (27A) (27B) corresponding to each operation signal is turned off. > stops, and the heat medium supply valves (40) and (11) close.Also, when the relay switches (351A) and (351B) are both turned off, the input terminal (IP) of the combustion control device (38)
Since the heavy pressure V is no longer supplied to the combustion control device (3
8) stops the operation of the circulation pump (9) and the combustion in the burner (2). At this time, the charge in the capacitor (71) is quickly discharged via the resistor (7o) and the diode (68>).

(Effects of the invention) Since this invention is configured as described above, when any of the plurality of indoor control devices is issuing an operation signal, the heat exchanger is heated by the burner; The heated heat medium is supplied only to the radiators that require heating, which not only prevents wasteful heat radiation, but also adjusts the combustion amount of the burner according to the number of operation signals, so that each radiator's It is possible to realize comfortable and efficient heating operation by preventing the hot air temperature and heat medium temperature from fluctuating greatly depending on the overall heating load.

In addition, in the control device for a heater according to claim 2, when the burner starts combustion, strong twisting is performed regardless of the number of radiators in operation, and ignition can be performed well, and the room temperature can be raised quickly. It has the effect of

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the circuit configuration of a control device for a heating machine showing one embodiment of the present invention, Fig. 2 is a main part electrical circuit diagram, and Fig.
The figure is a schematic diagram of a heater to which the present invention is applied. <1)... Heat source machine, (2)... Burner, (3)
...Heat exchanger, (9) ...Circulation pump, (10
)(11)...Heat medium supply valve, (16)...Heat source side control device, (26A)(26B)...Radiator,
(29A) (29B)... Indoor control device, (T)
... timer means, (C) ... heat medium circulation path,
(C1) (C2)... Branching road.

Claims (2)

[Claims] (1) A heat medium circulation path is formed by connecting a heat exchanger built into a heat source device and heated by a burner, a circulation pump, and a plurality of branch paths each having a heat medium supply valve and a radiator in a ring shape. In the heating system, there is an indoor control device that is installed in each of the plurality of radiators and issues an operation signal according to the heating load, and a burner is caused to perform combustion when there is an operation signal from these indoor control devices. and a heat source side control device that changes the combustion amount of the burner according to the number of operation signals and opens a heat medium supply valve corresponding to each operation signal. Device. (2) The heat source side control device is provided with means for causing the burner to perform strong combustion regardless of the number of operation signals from the start of combustion of the burner until a predetermined time has elapsed. A control device for a heating machine as described in Section 1.