JPH02230029A - Indoor heating apparatus - Google Patents

Abstract

PURPOSE:To make the indoor heating comfortable and economical and prevent the freeze of the system with certainty and good efficiency by a method wherein the combustion at the burner is proportionate to the number of the operation signals and, when the temperature of the thermal medium falls below a specified point, all of thermal medium feed valves are opened independent of the operation signals. CONSTITUTION:When a signal or signals for controlling the operation are given by any or all of indoor controls 29A, 29B appertaining to respective radiators 26A, 26B, a heat source control 16 determines the amount of the heating load proportionate to the number of the operation-controlling signals and accommodates the volume of the combustion at a burner 2 accordingly. The heat source control 16 also opens thermal medium feed valves 10, 11 in accordance with the operation-controlling signals. This method involves virtually no troubles relating to influences of the totality of the heating load upon the temperature of the hot air and that of the thermal medium at the respective radiators 26A, 26B. When the temperature of the thermal medium falls below a specified point during suspension of the heating operation, the heat source control 16 opens all of the thermal medium feed valves 10, 11 and starts a specified volume of combustion at the burner 2. As a result, thermal medium heated by a heat exchanger 3 is sent to all parts of the thermal medium-circulating line and freeze can be prevented efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a heating device that performs heating by circulating a heat medium from a heat exchanger heated by a burner to a plurality of radiators using a pump. (Explanation) Conventional technology This type of conventional heating device is known, for example, from Japanese Patent Application Laid-Open No. 56-133.
As disclosed in Japanese Patent No. 540, a heat exchanger built in a heat source device and heated by a burner, a circulation pump,
A heating medium circulation path is formed by connecting a plurality of branch paths having a heating medium supply valve and a radiator in an annular manner, and the burner and circulation pump are operated by an operation signal from the radiator side,
It is known that the heating medium supply valve can be opened and the heating medium (water, antifreeze, etc.) from the heat exchanger can be supplied to the radiator to heat the room. [C) Problems to be Solved by the Invention By the way, in the above-mentioned heating device, 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. This has the advantage that no heat medium is supplied, preventing wasteful heat radiation. However, since the burner combustion amount 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 also the heat medium of the heat exchanger when the number of radiators in operation is small. There have been problems in which the temperature rises excessively and the combustion of the burner is frequently stopped and the room temperature does not reach the desired temperature when a large number of units are in operation.

A similar problem also occurs when operating a burner to prevent the heat medium from freezing.

This invention was made in view of the above facts,
The purpose is to realize comfortable and economical warm-up operation and to ensure reliable and efficient antifreeze operation.

(2) Means for Solving the Problems This invention includes a heat exchanger built into a heat source device and heated by a burner, a circulation pump, a heat medium supply valve, and a plurality of branch paths each having a radiator. are connected in a ring, 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 an operation signal for one of these indoor control devices. At times, the heat medium supply valve corresponding to the operation signal is opened, and the burner is made to perform combustion according to the number of operation signals, and when the heat medium temperature has decreased to a predetermined temperature or less, regardless of the operation signal. This configuration includes a heat source side control device that opens all heat medium supply valves and causes the burner to perform a predetermined amount of combustion.

(*》Operation) 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. The size of the heat medium is determined and the combustion amount of the burner is adjusted. Also, the heat medium supply valve corresponding to the operation signal is opened. Therefore, the heated heat medium is supplied only to the radiator that requires heating. In addition, the combustion amount of the burner is appropriately adjusted according to the heating load, and there is no need to worry about the hot air temperature or heat medium temperature of each radiator changing greatly depending on the overall heating load, making it comfortable and economical. When the heat medium temperature drops below a predetermined temperature while the heating operation is stopped, the heat source side control device opens all the heat medium supply valves and injects a predetermined amount of combustion into the burner. As a result, the heat medium heated by the heat exchanger is distributed to every corner of the circulation path, reliably preventing the heat medium from freezing, and heating the heat medium appropriately to achieve high efficiency. Antifreeze operation will be carried out.

(F) Example Hereinafter, an example of the present invention shown in the drawings will be described. , this burner (2
) and an exhaust fan <
4), a heat medium tank <5>, and this heat medium tank (5)
), a reserve tank (8) connected to the heat medium tank (5) via the pressure regulating valve (7) of the radiator cap (6), a circulation pump (9), and a thermal valve. Two closed heat medium supply valves (10) (11), a gas pipe (12) connected to the burner (2), and a gas pipe (12) connected to the burner (2).
) and a proportional control valve (14) installed in the
and an ignition device (15) installed near the burner (2).
and a heat source side control device (16) are built in.

Also, two piping connection ports (17) (1B>, return side header (19), heat exchanger (3), heat medium tank (5),
Circulation pump (9), outgoing header (20), two heat medium supply valves <10) <11), and two piping connections (
21 ) and (22) are sequentially connected by piping, and these constitute a heat medium circulation path (C) on the heat source device (1) side, and a heat medium circulation path near the heat medium outlet of the heat exchanger (3). Road (
A heat medium temperature sensor (Th) is attached to C). In addition, there is a liquid supply port (23) at the top of the heat medium tank (5).
A check valve (24) is built into this liquid supply port (23). This check valve (24) allows the heat medium to flow in the direction of the arrow (e.g., Q,3)tg/cm'' or higher), and in the direction of the arrow (7), and allows the heat medium to flow in the direction of the arrow (25A) and (25B> are indoor units such as fan convectors installed indoors, respectively.
25A) (25B) has a heat sink <26A) (26B),
Blow fan (27A) (27B), room temperature thermistor (2
8A) (28B), and indoor control device (29A) (2
9B) is built-in, and a heat sink (26A) (
26B) is connected to the heat medium circulation path (C) via the branch path (CI) (C2). FIG. 2 shows the internal configuration of the control unit of the heating device described above, and the indoor control device (29A) (29B) includes operation switches (30A) (30B) and a room temperature thermistor (2).
8A) (28B) detects the room temperature and temperature setting device (31A)
) (Compare the set temperature set in 31B>, and when the room temperature is lower than the set temperature, the thermo switch (32A)
Room temperature control circuit (33A) (33A) to turn on the room temperature control circuit (32B)
B), fan motors (34A) (34B) for driving blower fans (27A) (27B) whose energization is controlled by an operation switch and a thermoswitch, and relays <3
5A) (35B).

On the other hand, the heat source side control device (16) is a heat medium temperature sensor (T
h) A heating medium control device (36) that emits an on/off thermo signal according to the detected temperature, and a relay (35A) (35)
B) Relay contact (351A) that can be opened and closed (351
Input the contact signal (operation signal) of B) and turn on the indoor unit (25A
) (25B) is in operation or not, and this operating number determining device (37) determines the operation signal of one or more units, and the above-mentioned heat medium control device (36) a fan motor (38) for driving the exhaust fan (4) when the heat medium control device (36) is emitting a first on signal or when the heat medium control device (36) is emitting a second on signal;
Circulation pump《9》, cutoff valve (13), and ignition device (1
5) Combustion control device (39
>>, the proportional valve (14) in response to the output signal of the operating number determination device (37) according to the number of inputs of the relay contacts (351A) (351B>), and the second ON signal of the heat medium control device (36). A proportional valve control device (40) that adjusts the valve opening degree of the heating medium supply valve (10 ) (11) and a supply valve control device (41) that opens them.
37), proportional valve control device (40) and supply valve control device (
41) shows the internal circuit. Heat medium control device (
36) is a heat medium temperature sensor (Th) consisting of a thermistor.
, a first thermocircuit (48) composed of resistors (42) to (46) and a comparator (47), a heat medium temperature sensor (Th), a resistor (42), a resistor (49) to <<52>>
and a second thermo circuit (54) composed of a comparator (53).
), an auxiliary relay <<56>> whose energization is controlled by an inverter (55) such as a transistor to which the output of the comparator (53) is supplied, and a buffer circuit provided on the output side of the comparator (53>). (57), capacitor (58), resistor (5
9》 and a timer circuit (61》) consisting of a buffer circuit (60), and a first and second thermo circuit (4g).
(54)'s turn-off thermo signal is detected by the combustion control device (3).
9). The device for determining the number of operating units (37) has resistors (62) and (63) connected in series to relay switches (35lA) and (351B), respectively, and a connection point (64).
(65) and a NAND circuit (66) that inputs the voltage of the connection point (64) and (65), and the voltage of the connection points (64) and (65) is also supplied to the combustion control device (39).The proportional valve control device (40)
is a transistor (67》), a resistor (68) or (70〉)
, an operational amplifier (71), a transistor (72), etc., and a proportional valve (14) depending on the voltage at the connection point (73).
The valve opening degree is adjusted by increasing or decreasing the amount of current flowing through the transistor (67), and the base of the transistor (67) is a diode (74).
The supply valve control device (4!) is connected to the output end of the buffer circuit (60) via the resistor (75) and to the output end of the NAND circuit (66) via the resistor (75). <76), and inverters such as transistors (77
It consists of a series circuit of a second relay (78), and an inverter (79) such as a transistor, and the input end of the inverter (77) < 79
65). The heat medium supply valves (10) and (11) are connected to the first relay (76) and the second relay (78), respectively, as shown in Fig. 4.
It is connected to the AC power source (80) via relay switches (761) (781>) which are opened and closed by the relay switch (761) (781>).In addition, there is a relay switch (761) (781) which is opened and closed by the auxiliary relay (56) in parallel with the relay switch (351A). A series circuit of a relay switch (561) and a die (81) is provided, and a relay switch (35
1B>, a series circuit of a relay switch (561) and a die (82) is provided in parallel. When only the operation switch (30A) of indoor m<25A> is turned on and the thermo switch (32A) is turned on, the fan motor (34A> is energized and the blower fan (2
7A) is driving. Further, the relay switch (351A) is closed by energizing the relay (35A). At this time, in the operation number determination device (37) of the heat source side control device (16), the constant voltage VD of the power supply terminal (83) is supplied to the connection point (64), so the output of the inverter (77) is “ L", the first relay (76) is energized, and the heat medium supply valve (10)
opens. In addition, since the voltage at the connection point (64) is supplied to the combustion control device (39), the combustion control device It (39)
performs combustion control of bar-J-(2) as follows. That is, the detected temperature of the heat medium temperature sensor (Th) is lower than the second set temperature (for example, 60"C), and the heat medium control device <3
The first thermo circuit (48) of
7) output is “H”), the combustion control device (
39) first starts the fan motor (38) for driving the exhaust fan (4), causes the burner (2) to perform pre-purging, and starts the circulation pump (9>).Then, the combustion control device (39) activates the igniter (15), opens the shutoff valve (13), and causes the burner (2) to start combustion.

In this way, the circulation pump <9) is operated based on the operation signal of the indoor controller (29A), and when combustion is performed in the Pana (2), the heat medium heated in the heat exchanger (3) are heat medium tank <<5>>, circulation pump (9>), outgoing header (20), heat medium supply valve (10), and piping connection port (
21) to the branch road (CI) and the radiator (26A).
). Here, heat is exchanged with the indoor air sent by the blower fan (27A), and after the heat is used for indoor heating, the pipe connection port <l7) and the return side header (19
), returns to the heat exchanger (3), and repeats the circulation shown by the solid line arrow. At this time, one of the two manpower of the NAND circuit (66) of the operation number determination device [37] becomes 'H' ( Since the voltage V,) and other inputs are "L" (earth level) and its output is "H", the transistor (67) is on in the proportional valve control device (40), and the connection is closed. In addition, the output voltage of the operational amplifier (71) is low and the conductivity of the transistor (72) is low, so the current flowing through the proportional valve (14) is reduced by φ. >> The valve opening degree is small.Then, the burner (2) performs weak combustion and the combustion amount commensurate with the heating load is obtained, so the temperature of the hot air from the indoor unit (25A) does not rise to an extreme level. Or, the temperature detected by the heat medium temperature sensor (Th) becomes equal to or higher than the third set temperature (for example, 90°C), and the second thermocircuit (48) outputs an off signal (the output of the comparator (47) becomes “L”).
”) is emitted and combustion is not stopped unnecessarily.

Only the operation switch (30B) of the indoor control device e (29B>) is turned on, the thermo switch (32B) is turned on, and the operation signal is sent from the indoor control device (29B) to the heat source side control device (16》). The same applies when the heat is emitted, and in this case, the heat medium supply valve (11) is opened.Then, the heat medium of the heat exchanger (3) is supplied to the heat radiator (as shown by the dashed arrow).
26B) and is used to heat the room where the radiator (26B) is installed.
Light combustion is performed in conjunction with the operation of the machine.

Operation switch of indoor control device (29A) (29B) (
30A>(30B>) and the thermo switches (32A) (32B) are turned on, the relay switches (351A) (351B) are turned on. In this case, the heat source side control device <16> is reversed. Vessel (77) (79)
The output becomes "L", the relay (76 bar 78) 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). In addition, both the two-man power of the NAND circuit (66)
", and its output becomes 'L', so the transistor (67) is turned off. Then, the voltage at the connection point (73) is increased, the amount of current flowing through the proportional valve (l4) is increased, and strong combustion is performed in the burner (2).In this way, the indoor control device e<29A) (29B ) to the heat source side control device (1
6) at the same time, the combustion amount of the burner (2) will increase, so each radiator (26A) (
26B) can be prevented from decreasing in temperature of the hot air, and the room temperature can be quickly raised to the set temperature.

The operation switch (30A) (30B) or thermo switch (32A bar 32B) is turned off, and the relay switch (
When 351A) (351B) are turned off, the blower fans 27A) (27B) corresponding to the respective operation signals are stopped, and the heat medium supply valves (10) and (11) are closed. Also, when both relay switches (351A) and (351B) are turned off, the combustion control device (38) is connected to the connection point (64) (
65) is no longer supplied, the combustion control device (39》) operates the circulation pump (9) and the burner (2》).
and stop combustion.

While the heating operation is stopped, the heat medium temperature sensor (T
h) When the detected temperature becomes lower than the first set temperature (for example, 5°C), the second thermocircuit (54) is turned on in the heat medium control device (36) (the output of the comparator (53) is “H”). )
emits. At this time, the output of the inverter (55) becomes "L" and the auxiliary relay <<56>> is energized, so the relay switch (561) is turned on and the relay switch (35) is turned on.
1A) Combustion control device in the same way as when (351B) is on! The voltage at the connection points (64) and (65) is supplied to (39). Then, when the relays (76) and (78) are energized, the heat medium supply valves (10) and (11) are opened, and the combustion control device (39) operates the burner (2) and the pump (9). In addition, although the output of the NAND circuit (66) is 'L', the timer circuit (66) is
1》 output (output of buffer circuit (60)) is “H”
Therefore, regardless of the output of the NAND circuit (66), the transistor (67) is turned on, the valve opening of the proportional valve (14) is small, and the burner (2) performs weak combustion.
Thereafter, when the capacitor (58) is sufficiently charged in the direction shown in the figure after a predetermined period of time has elapsed, the output of the timer circuit (61) becomes 'L', and the transistor (67) is connected to the NAND circuit (
66), the burner <<2>> shifts to strong combustion. As a result, the heat medium heated by the heat exchanger (3) is distributed throughout the heat medium circulation path (C), and when the temperature detected by the heat medium temperature sensor (Th) exceeds the second set temperature, the second thermostat The circuit (54) outputs an off signal (comparator (53)
) outputs "L"), and the heat medium supply valve (10) (1
1) is closed, the burner (2) and the circulation pump (9) are stopped, and the operation to prevent freezing of the heat medium is completed.

In this way, during antifreeze operation, the burner (2)
Since the thermal valve (10) performs weak combustion before transitioning to strong combustion, the thermal valve (10) takes a long time (for example, several tens of seconds) to fully open from full open as in this example. (
11), even if the heat medium is used in the heat medium circulation path (
C) It is possible to prevent the thermocircuit (54) from issuing an off signal before the combustion reaches the entire body, thereby preventing combustion from stopping.

In addition, after the heat medium supply valve (10) is fully opened, the temperature of the heat medium can be quickly raised, so as shown in Fig. 5, a hot water mat with a large heat capacity etc. Even if the floor heaters (84A) (84B) are connected, the antifreeze operation can be completed in a relatively short time (for example, several minutes).
As shown in the figure, the output of the second thermocircuit (54) is supplied to the base of the transistor (67) via the buffer circuit (60) and die converter (74), and weak combustion occurs during antifreeze operation. If only a radiator is used, as in the heating system shown in Figure 1, the antifreeze operation will not be prolonged even if weak combustion is continued. Effects Since the present 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, and the heat medium heated by the heat exchanger is heated. Heating is supplied only to the radiators that require it,
Not only is unnecessary heat radiation prevented, but the burner combustion amount can be adjusted according to the number of operation signals, and the hot air temperature and heat medium temperature of each radiator can be prevented from fluctuating greatly depending on the overall heating load. , it is possible to realize a comfortable and economical heating operation, and furthermore, when the heating medium temperature falls below a predetermined temperature while the heating operation is stopped, all the heating medium supply valves are opened, Since the burner burns a predetermined amount, the heat medium heated appropriately by the heat exchanger can be supplied to every corner of the heat medium circulation path, and the heat medium can be reliably and efficiently prevented from freezing. It is.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a heating device showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of a circuit configuration of a control device of the heating device, Fig. 3 is a main part electric circuit diagram, and Fig. 4 is a diagram of a heating device. FIG. 5 is a schematic configuration diagram of a heating device showing another embodiment of the present invention, and FIG. 6 is a main part electric circuit diagram showing another example of a control device for a heating device. be.

Claims (1)

[Claims] (1) A heat medium circulation path in which a heat exchanger built in a heat source device and heated by a burner, a circulation pump, a heat medium supply valve, and a plurality of branch paths each having a radiator are connected 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, and a heat medium supply valve that responds to the operation signal when there is an operation signal from any of these indoor control devices. At the same time, the burner is made to perform combustion according to the number of operation signals, and when the heat medium temperature falls below a predetermined temperature, all the heat medium supply valves are opened regardless of the operation signal, and the burner is A heating device comprising: a heat source side control device for causing a predetermined amount of combustion to occur.