JPH0794901B2 - Heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application The present invention performs heating by circulating a heat medium (water or liquid such as antifreeze) of a heat exchanger heated by a burner to a radiator by a pump. Regarding heating equipment.

(B) Conventional Technology A conventional heating device of this type is, for example, as disclosed in Japanese Utility Model Publication No. 58-7213, one in which hot water of a hot water boiler is circulated by a pump to a radiator for heating. , Mitsuko Sho58-61
As disclosed in No. 65, one water heater and a plurality of fan convectors are connected by independent hot water circulation circuits, and automatic valves provided in each hot water circulation circuit are connected to the radiator operation signal. It is known that the hot water is circulated only in the radiator that needs to be heated by opening and closing in correspondence with the above.

(C) Problems to be Solved by the Invention In the above-described heating device, the heat medium circulation temperature may fluctuate greatly due to load changes of the radiator during heating operation, and the heat medium may boil when the load is small. Therefore, the heat source side control device is provided with the heat medium control device that starts and stops the burner according to the heat medium temperature in the heat exchanger. Further, in order to prevent the heat medium from freezing while the heating operation is stopped, a protective device that operates the burner or the electric heater according to the temperature of the heat medium such as piping is provided separately from the heat medium control device described above. It was Therefore, not only two sensors for detecting the heat medium temperature are required, but also the circuit configuration of the control unit becomes complicated.

This invention has been made in view of the above facts,
An object of the present invention is to reliably prevent boiling of the heat medium and freeze prevention by using a common heat medium temperature detecting sensor.

According to the present invention, in a heating device in which a heat medium of a heat exchanger heated by a burner is circulated by a pump to a radiator, a plurality of chambers that emit an operation signal based on an operation instruction of an operation switch, a thermoswitch, or the like. The inside control device and the heat source side control device that causes the burner to burn when the operation signal of the indoor side control device is supplied are provided, and this heat source side control device has a sensor that detects the heat medium temperature. However, when the temperature detected by this sensor is above the boiling danger temperature, the combustion of the burner is stopped regardless of the operation signal of the indoor side control device, and when the temperature detected by the sensor is below the freezing danger temperature, the inside of the room This is a configuration in which a protective device that causes the burner to perform combustion is provided regardless of the operation signal of the control device.

Further, according to the present invention, in the heating device in which the heat medium of the heat exchanger heated by the burner is circulated by a pump in a plurality of branch passages each having a heat medium supply valve and a radiator, A plurality of indoor side control devices that are provided for the heat medium supply valve and the radiator corresponding to 1: 1 and that emit an operation signal based on an operation instruction such as an operation switch and a thermoswitch, and the plurality of indoor side control devices. And a heat source side control device for causing the burner to burn when any operation signal of the control device is supplied and for opening the heat medium supply valve corresponding to the indoor side control device issuing the operation signal. ,
This heat source side control device has a sensor for detecting the heat medium temperature, when the temperature detected by this sensor is above the boiling dangerous temperature, the combustion of the burner is stopped regardless of the operation signal of the indoor side control device, and When the temperature detected by the sensor is equal to or lower than the freezing dangerous temperature, a burner is caused to burn regardless of the operation signal of the indoor side control device, and a protection device for opening all the heat medium supply valves is provided. Is.

Further, according to the present invention, in the heating device of claim 2 or 3, the heat medium temperature detecting sensor is attached to the heat medium circulation passage near the heat medium outlet of the heat exchanger.

(E) Operation With this configuration, the burner operation can be stopped when the heat transfer medium temperature exceeds the boiling critical temperature due to load fluctuations during heating operation in which the radiator outputs an operation signal. If the temperature of the heat transfer medium drops below the freezing critical temperature during shutdown,
Not only can the heat medium heating device such as a burner be operated, damage to the heat medium circulation path due to boiling or freezing of the heat medium can be prevented, but also a sensor for detecting the heat medium temperature can be shared to simplify the protection device. Is possible.

Further, in the heating device according to the second aspect, the heat medium heated by the heat exchanger is supplied to every corner of the heat medium circulation path without individually opening the heat medium supply valve to prevent the heat medium from freezing. Further, in the heating device of claim 3, the boiling danger temperature of the heat medium heated by the heat exchanger and the freezing danger temperature of the heat medium when the heating operation is stopped are accurately determined using one sensor. It is possible to detect.

(F) Embodiment Hereinafter, an embodiment of the present invention shown in the drawings will be described.

In FIG. 1, (1) is a heat source device arranged outdoors, and the heat source device (1) includes a burner (2), a heat exchanger (3) heated by the burner (2), and an exhaust gas. It was connected to the heat medium tank (5) via a fan (4), a heat medium tank (5), and a pressure regulating valve (7) of a radiator cap (6) mounted on the heat medium tank (5). Reserve tank (8), circulation pump (9), two normally closed heat medium supply valves (10) (11) consisting of heat operated valves, and gas pipe (12) connected to burner (2) , A shutoff valve (13) and a proportional control valve (14) provided in the gas pipe (12), an ignition device (15) provided near the burner (2), and a heat source side control device (16) It is built in. Also, the two pipe connection ports (17) and (18), the return side header (19), the heat exchanger (3), the heat medium tank (5), the circulation pump (9), the forward side header (20), and the two. Heat medium supply valve (10) (11),
And the two pipe connection ports (21) and (22) are sequentially connected by pipes, which form the heat medium circulation path (C) on the heat source unit (1) side, and the heat of the heat exchanger (3). A heat medium temperature sensor (Th) is attached to the heat medium circulation path (C) near the medium outlet. 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 in the liquid supply port (23). This check valve (24) allows the heat medium to flow in the direction of the arrow when pressure (for example, 0.3 kg / cm ² or more) is applied in the direction of the arrow, and allows the flow of the heat medium in the direction opposite to the arrow. It is to prevent. (25A) (25
B) is an indoor unit such as a fan convector installed in the room. The indoor unit (25A) (25B) has a radiator (26A).
A) (26B), blower fans (27A) (27B), room temperature thermistors (28A) (28B), and indoor control devices (29A) (29B)
Is built in. The radiators (26A) (26B) are connected to the heat medium circulation path (C) via the branch paths (C1) (C2).

FIG. 2 shows the internal structure of the control part of the heating device described above. The indoor side control devices (29A) (29B) have operation switches (30A) (30B) and room temperature thermistors (28A) (28B). Room temperature control circuit (33A) that compares the detected room temperature with the set temperature set by the temperature setter (31A) (31B) and turns on the thermo switches (32A) (32B) when the room temperature is lower than the set temperature (33B), fan motors (34A) and (34B) for driving blower fans (27A) and (27B) whose energization is controlled by an operation switch and a thermo switch, and a relay (35).
A) and (35B).

On the other hand, the heat source side control device (16) is a heat medium temperature sensor (Th).
Contact signal (operation signal) of the heat medium control device (36) that outputs an on / off thermo signal according to the detected temperature of the relay and the relay contacts (351A) (351B) that are opened and closed by the relays (35A) (35B) Is input to determine whether or not the indoor units (25A) (25B) are operating, and the operating number determination device (37) determines one or more operating signals, and A fan motor 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. (38), the circulation pump (9), the shutoff valve (13), and the ignition control device (15) that energizes the ignition device (15) in a predetermined sequence, and the number of relay contacts (351A) (351B) The output signal of the operating number discriminating device (37) and the second ON signal of the heat medium control device (36). Flip and proportional valve (14)
Of the proportional valve control device (40) for adjusting the valve opening of the device, the discriminating signal of the operating device discriminating device (37), and the heat medium control device (3).
In response to the second ON signal of 6), the heat medium supply valve (10) (1
Supply valve control device (4) that energizes 1) to open them
1) and are provided.

FIG. 3 shows the heat medium control device (36) and the operating number discriminating device (3
7), proportional valve controller (40) and supply valve controller (41)
2 shows the internal circuit of the. The heat medium control device (36) includes a heat medium temperature sensor (Th) consisting of a thermistor and a resistor (4
2) to (46) and a first thermo circuit (48) composed of a comparator (47), a heat medium temperature sensor (Th), a resistor (4)
2), a second thermo circuit (54) composed of resistors (49) to (52) and a comparator (53), and an inverter (55) such as a transistor to which the output of the comparator (53) is supplied. The auxiliary relay (56) whose energization is controlled and the output side of the comparator (53) are provided with a buffer circuit (57) and a capacitor (5).
8), a timer circuit (61) composed of a resistor (59) and a buffer circuit (60), and the combustion control device receives the on / off thermo signals of the first and second thermo circuits (48) (54). (39) is being supplied. The operating number discriminating device (37) has a NAND circuit (66) in which the resistors (62) and (63) connected in series to the relay switches (351A) and (351B) and the voltages at the connection points (64) and (65) are input. ) And the connection point (6
4) The voltage of (65) is also supplied to the combustion control device (39). The proportional valve control device (40) is composed of a transistor (67), resistors (68) to (70), an operational amplifier (71), a transistor (72), etc., and the proportional valve (14) is controlled according to the voltage of the connection point (73). ) Of the transistor (67) is connected to the output terminal of the buffer circuit (60) through the diode (74) and the resistance (75 ) Through the NAND circuit (66)
Is connected to the output end of. The supply valve control device (41) includes a series circuit of a first relay (76) and an inverter (77) such as a transistor, and a second relay (78) and a series circuit of an inverter (79) such as a transistor. Inverters made up (77)
The input ends of (79) are connected to the connection points (64) and (65), respectively.

As shown in FIG. 4, the heat medium supply valves (10) and (11) are
They are connected to an AC power supply (80) via relay switches (761) and (781) that are opened and closed by a first relay (76) and a second relay (78), respectively. In addition, relay switch (351
A series circuit of a relay switch (561) and a diode (81) opened and closed by an auxiliary relay (56) is provided in parallel with A), and a relay switch (561) and a diode (82) are provided in parallel with the relay switch (351B). A series circuit of is provided.

Only the operation switch (30A) of the indoor unit (25A) is turned on,
When the thermo switch (32A) is on, the fan motor (34A) is energized and the blower fan (27A) operates. Also, the relay switch (351A) is closed by energizing the relay (35A). At this time, in the operating number discriminating device (37) of the heat source side control device (16), the constant voltage V _D of the power supply terminal (83) is supplied to the connection point (64), so that the output of the inverter (77) is changed. When it goes to "L", the first relay (76) is energized and the heat medium supply valve (10) is opened. Moreover, since the voltage at the connection point (64) is supplied to the combustion control device (39), the combustion control of the burner (2) is performed as follows by the combustion control device (39). 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 first thermo circuit (48) of the heat medium control device (36) outputs the ON signal (comparator (47) When the output is "H"), the combustion control device (39) first
The fan motor (38) for driving the exhaust fan (4) is started, the burner (2) is pre-purged, and the circulation pump (9) is started. Next, the combustion control device (39) operates the ignition device (15), opens the shutoff valve (13), and causes the burner (2) to start combustion.

In this way, when the circulation pump (9) is operated based on the operation signal of the indoor control device (29A) and combustion is performed in the burner (2), the heat medium heated in the heat exchanger (3) Enters the branch passage (C1) through the heat medium tank (5), the circulation pump (9), the outward header (20), the heat medium supply valve (10) and the pipe connection port (21), and the radiator (26A) ).
Then, after heat exchange with the indoor air sent by the blower fan (27A) and being used for indoor heating, the heat exchanger passes through the pipe connection port (17) and the return side header (19). Returning to (3), the circulation indicated by the solid arrow is repeated. At this time, of the two inputs of the NAND circuit (66), one input is “H” (voltage V _D ), the other input is “L” (earth level), and its output is Since it is "H", the transistor (67) is ON in the proportional valve control device (40), and the voltage at the connection point (68) is low. Further, since the output voltage of the operational amplifier (71) is low and the conductivity of the transistor (72) is small, the current flowing through the proportional valve (14) is small and the valve opening of the proportional valve (14) is small. Then, since the burner (2) performs weak combustion and obtains a combustion amount commensurate with the heating load, the warm air temperature of the indoor unit (25A) extremely rises or the heat medium temperature sensor (Th) detects it. The temperature has risen above the third set temperature (for example, 90 ° C), and the second thermo circuit (48) turns off (the output of the comparator (47) is "L").
The combustion will not be stopped unnecessarily.

Only the operation switch (30B) of the indoor control device (29B) is turned on, and the thermoswitch (32B) is turned on.
The same applies when an operation signal is issued from the indoor side control device (29B) to the heat source side control device (16), in which case the heat medium supply valve (11) is opened. Then, the heat medium of the heat exchanger (3) circulates to the radiator (26B) as indicated by a dashed arrow and is used for heating the room in which the heater (26B) is set. Further, the burner (2) performs weak combustion in accordance with the operation of one indoor unit.

Indoor side control device (29A) (29B) operation switch (30A)
(30B) is turned on and the thermo switch (32B)
When A) (32B) is on, relay switch (351A) (35
1B) turns on. In this case, in the heat source side control device (16), the output of the inverters (77) (79) becomes "L" and the relay (7
6) (78) is energized and the heat medium supply valves (10) (11) are opened. Therefore, the heat medium of the heat exchanger (3) circulates to the radiators (26A) (26B) as shown by solid and dashed arrows, and is used for heating the room where the radiators (26A) (26B) are installed. Used. Further, since both inputs of the NAND circuit (66) become "H" and their outputs become "L", the transistor (67) is turned off. Then, the voltage at the connection point (73) is increased, the energization amount of the proportional valve (14) is increased, and strong combustion is performed in the burner (2). Thus, when the operation signals are simultaneously sent from the indoor side control devices (29A) and (29B) to the heat source side control device (16), the combustion amount of the burner (2) increases, so that the respective radiators (26A). It is possible to prevent the temperature of the hot air at (26B) from decreasing and to quickly raise the room temperature to the set temperature.

Operation switch (30A) (30B) or thermo switch (32
A) (32B) is turned off and relay switch (351A) (35
1B) is turned off, the blower fans (27A) (27B) corresponding to the respective operation signals stop, and the heat medium supply valve (10)
(11) closes. In addition, the relay switch (351A) (351
When both B) are turned off, the voltage V _D is not supplied to the connection points (64) (65) to the combustion control device (38), so the combustion control device (39) operates the circulation pump (9) and burner. The combustion in (2) is stopped.

While such heating operation is stopped, the heat medium temperature sensor (T
When the detected temperature of h) becomes lower than the first set temperature (for example, 5 ° C.), the heat medium control device (36) causes the second thermo circuit (5
4) issues an ON signal (the output of the comparator (53) is "H"). At this time, the output of the inverter (55) becomes "L" and the auxiliary relay (56) is energized, so the relay switch (56
1) is turned on, the connection point (64) to the combustion control device (39) is the same as when the relay switches (351A) (351B) are turned on.
The voltage of (65) is supplied. And the relay (76) (7
The heat medium supply valves (10) and (11) are opened by energization of 8), and the combustion control device (39) operates the burner (2) and the pump (9). The output of the NAND circuit (66) is "L", but the output (buffer) of the timer circuit (61) is kept for a predetermined time (for example, 70 seconds) after the second thermo circuit (54) issues an ON signal. The output of the 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 reduced, and the burner (2) performs weak combustion. After that, when the capacitor (58) is sufficiently charged in the direction shown in the figure after a predetermined time has elapsed, the output of the timer circuit (61) becomes "L" and the transistor (67) is turned off by the output of the NAND circuit (66). Therefore, the burner (2) shifts to strong combustion. As a result, the heat medium heated by the heat exchanger (3) spreads throughout the heat medium circulation path (C), and the heat medium temperature sensor (T
When the temperature detected in h) becomes equal to or higher than the second set temperature, the second thermo circuit (54) turns off (the output of the comparator (53) is "L").
The heat medium supply valves (10) and (11) are closed, the burner (2) and the circulation pump (9) are stopped, and the heat medium freeze prevention operation is completed.

According to this embodiment, the temperature detected by the heat medium temperature sensor (Th) is the third set temperature (dangerous boiling temperature) due to load fluctuations and other factors during the heating operation in which any of the indoor side control devices issues an operation signal. In the above case, the burner (2) is stopped, the boiling of the heat medium can be prevented, and the temperature detected by the heat medium temperature sensor (Th) during the stop of the heating operation is equal to or lower than the first preset temperature (freezing danger temperature). Then, the burner (2) is actuated, the heat medium supply valves (10) and (11) are opened, and the heat medium heated by the heat exchanger (3) is distributed to every corner of the heat medium circulation path (C). The heat medium can be supplied to prevent boiling of the heat medium, and the heat medium temperature sensor (Th) can be shared to simplify the heat medium control device (protection device) (36). In addition, since the heat medium temperature sensor (Th) is attached to the heat medium circulation path (C) at the outlet of the heat exchanger (3), boiling of the heat medium in the heat exchanger (3) during the heating operation is performed in advance. Heat medium temperature sensor (T
The heat medium temperature sensor (Th) has a small heat capacity as well as can be sensed by h), and it is attached to the piping part that is easily affected by the outside air temperature. Heat medium temperature sensor (Th)
Can be accurately sensed.

In the above-described embodiment, the burner is operated to heat the heat medium during the freezing operation, but the circulation pump (9) is operated while heating the heat medium with an electric heater (not shown) instead of the burner. You may make it drive.

(G) Effect of the Invention Since the present invention is configured as described above, during heating operation in which an operation signal is issued on the radiator side, the heat medium temperature is the boiling dangerous temperature due to load fluctuations and other factors. When the above, the operation of the burner is stopped, it is possible to prevent boiling of the heat medium, and when the temperature of the heat medium falls below the freezing critical temperature during the heating operation is stopped, the heat medium heating device such as a burner operates to freeze the heat medium. It is possible to prevent the heat medium temperature and to protect the heat medium circulation path while simplifying the protection device by sharing the sensor for detecting the heat medium temperature.

Further, in the heating device according to the second aspect of the present invention, even if the operation signal is forcibly generated on the radiator side and the heat medium supply valve is not opened, every corner of the heat medium circulation path is heated by the heat exchanger. Since the heat medium can be supplied to prevent the heat medium from freezing, it is excellent in usability.

Furthermore, in the heating device according to claim 3, one sensor accurately detects the boiling dangerous temperature of the heat medium heated by the heat exchanger and the freezing dangerous temperature of the heat medium when the heating is stopped. Therefore, it is possible to more reliably control the boiling prevention and the freezing prevention of the heat medium.

[Brief description of drawings]

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 an electric circuit diagram of a main part of the same, and FIG. It is a drive circuit diagram of a medium supply valve. (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, (36) …… Heating medium control device (protection device), (Th) …… Heating medium temperature sensor, (C)
...... Heat medium circuit.

Claims (3)

[Claims] 1. In a heating device in which a heat medium of a heat exchanger heated by a burner is circulated to a radiator by a pump, a plurality of operation signals are issued based on an operation instruction of an operation switch, a thermoswitch, or the like. An indoor side control device and a heat source side control device that causes a burner to perform combustion when an operation signal for the indoor side control device is supplied are provided with a sensor for detecting the heat medium temperature. Having the temperature detected by the sensor is above the boiling danger temperature, the combustion of the burner is stopped regardless of the operation signal of the indoor side control device, and the chamber is detected when the temperature detected by the sensor is below the freezing danger temperature. A heating device provided with a protection device for causing the burner to burn regardless of the operation signal of the inner control device. 2. A heating device in which a heat medium of a heat exchanger heated by a burner is circulated by a pump through a plurality of branch passages each having a heat medium supply valve and a radiator, in each branch passage. A plurality of indoor side control devices that are provided for the heat medium supply valve and the radiator in a 1: 1 correspondence, and that emit operating signals based on operating instructions such as operating switches and thermo switches, and the plurality of indoor side controls A heat source side control device that causes the burner to burn when any operation signal of the device is supplied, and opens the heat medium supply valve corresponding to the indoor side control device that is issuing the operation signal, This heat source side control device has a sensor for detecting the heat medium temperature, when the temperature detected by this sensor is above the boiling dangerous temperature, the combustion of the burner is stopped regardless of the operation signal of the indoor side control device, and , The above When the detected temperature of the service is below the freezing dangerous temperature, the burner burns regardless of the operation signal of the indoor side control device, and a protective device is provided to open all the heat medium supply valves. And heating system. 3. The heating device according to claim 1, wherein the heat medium detecting sensor is attached to the heat medium circulation path near the heat medium outlet of the heat exchanger. .