JP2645883B2 - Heating system - Google Patents

Description

The present invention relates to a heating apparatus for heating by circulating a heat medium of a heat exchanger heated by a burner to a plurality of radiators by a pump.

(B) Conventional technology A conventional heating device of this type is disclosed in, for example, JP-A-56-133540.
As disclosed in Japanese Patent Laid-Open Publication No. H10-207, a heat exchanger built in a heat source device and heated by a burner, a circulation pump, and a plurality of branch paths having a heat medium supply valve and a radiator are connected in a ring shape. To form a heat medium circulation path, operate the burner and the circulation pump according to the operation signal on the radiator side, open the heat medium supply valve, and supply the heat medium (water or antifreeze, etc.) of the heat exchanger to the radiator. What heats a room indoors is known.

(C) Problems to be Solved by the Invention By the way, in the above-described heating device, since the heat medium supply valve is provided in the branch path, the heat medium is not supplied to the radiator which does not require heating, and wasteful heat radiation is performed. On the other hand, when one of the radiators is not used for a long time, there is a concern that the heat medium staying in the branch path may be altered or rust may be generated in the heat medium circulation path.

The present invention has been made in view of the above-described facts, and in a system in which a heat medium of a heat source device is circulated through a plurality of radiators via a heat medium supply valve to perform heating, any one of the radiators is used for a long time. It is an object of the present invention to suppress deterioration of a heat medium and corrosion of piping in a heat medium circuit even when not used.

(D) Means for Solving the Problems According to the present invention, a heat exchanger built in a heat source device and heated by a burner, a circulation pump, a plurality of branch paths having a heat medium supply valve and a radiator are provided. A heat medium circulation path connected in a ring, and an indoor control device that is provided in each of the plurality of radiators and emits an operation signal according to a heating load, and one of these indoor control devices emits an operation signal When the operation signal is open, the heat medium supply valve corresponding to the operation signal is opened, the burner and the circulation pump are operated, and when the operation signal of the indoor control device is lost, the operation of the circulation pump is continued for a predetermined time. And a heat source side control device for opening all the heat medium supply valves.

(E) Operation With this configuration, when any of the indoor control devices is issuing an operation signal, the heat medium is supplied only to the radiator that requires heating, and wasteful heat radiation is prevented. In addition, immediately after the driving signal disappears, a predetermined time,
Since the operation of the circulation pump is continued and all the heat medium supply valves are opened, even when any of the radiators is not used for a long period of time, the heat medium can be prevented from staying in the branch, and the heat medium can be prevented. Of heat and heat medium circulation path (especially branch path)
Corrosion is suppressed.

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

In FIG. 1, (1) is a heat source unit installed outdoors. The heat source unit (1) includes a burner (2), a heat exchanger (3) heated by the burner (2), and an exhaust fan. (4) a heating medium tank (5) and a reserve connected to the heating medium tank (5) via a pressure regulating valve (7) of a radiator cap (6) mounted on the heating medium tank (5). Tank (8), circulation pump (9), normally closed 2
One heat medium supply valve (10) (11), a gas pipe (12) connected to the 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)
And built-in. In addition, two piping connections (17)
(18), return side header (19), heat exchanger (3), heat medium tank (5), circulation pump (9), outgoing side header (20), two heat medium supply valves (10), (11) , And the two pipe connection ports (21) and (22) are sequentially connected by pipes, thereby forming a heat medium circulation path (C) on the side of the heat source device (1). A liquid supply port (23) is provided at an upper portion of the heat medium tank (5). The liquid supply port (23) has a check valve (24).
Is built-in. 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, and restricts the flow of the heat medium in the direction opposite to the arrow. It is to prevent. (25A) and (25B) are indoor units such as fan-con vectors installed in the room, respectively. The indoor units (25A) and (25B) have radiators (26A) (2
6B), blower fan (27A) (27B), room temperature thermistor (28
A) and (28B), and the indoor control units (29A) and (29B) are built in. The radiators (26A) and (26B) are connected to the heat medium circulation path (C) via the branch paths (C1) and (C2).

FIG. 2 shows the internal configuration of the control unit of the above-described heating device. The indoor control devices (29A) and (29B) include operation switches (30A) and (30B) and room temperature thermistors (28A) and (28B).
Compares the detected room temperature with the set temperature set by the temperature setting devices (31A) (31B), and turns on the thermoswitches (32A) (32B) when the room temperature is lower than the set temperature. 33A) (33B), blower fan (27A) (27B) whose energization is controlled by operation switch and thermo switch
It comprises a driving fan motor (34A) (34B) and relays (35A) (35B).

On the other hand, the heat source side control device (16) is a relay (35A) (35B)
The operation number discrimination device (36) that inputs the contact signal (operation signal) of the relay contact (351A) (351B) that is opened and closed by and determines whether the indoor units (25A) (25B) are operating, and this operation When the number discriminating device (36) discriminates one or more operating units, it issues a prepurge command to energize the fan motor (37) for driving the exhaust fan (4), and then issues a combustion command to shut off the shutoff valve (13). ), A combustion control device (38) that energizes the proportional valve (14) and the ignition device (15) in a predetermined sequence, and operates a circulation pump (9) in response to a pump operation command from the combustion control device (38). The heat medium supply valve (1) according to the discrimination signal of the pump drive device (39) to be operated
0) According to the number of supply of the relay contacts (351A) and (351B) when the combustion control device (38) issues a combustion command, the supply valve control device (40) that energizes (11) and opens them. A proportional valve control device (41) for inputting an output signal of the operating number discrimination device (38) and adjusting the valve opening of the proportional valve (14). Further, the supply valve control device (40) is provided when the operation number discrimination device (36) stops inputting an operation signal and the combustion control device (38) issues a post-purge command for a predetermined time. (10) Built-in circuit to open (11).

FIG. 3 shows the number of operating units (36), the pump drive (39), the supply valve controller (40) and the proportional valve controller (4).
This shows the internal circuit of 1). Operating number control device (3
6) is a relay switch (351A), a resistor (42) and a constant voltage element (43), and a relay switch (351B) and a resistor (4
4) and a series circuit of constant voltage element (45) and connection point (46)
The NAND circuit (48) to which the voltage signal of (47) is input and the voltage signal of "H" at the connection points (50) and (51) are transmitted to the combustion control device (3
8) The two diodes (5
2) (53). In addition, the supply valve control device (39) is a pair of OR-structured transistors (54) (55),
And a relay (56) for controlling a heat medium supply valve (10) connected in series to them, and a pair of OR-configured transistors (57) and (58), and a heat medium supply valve (100) connected in series to these 11) Control relay (59) and connection point (46)
A NOR circuit (60) that receives the voltage signal of (47) as an input, an inverter (61) cascaded to the NOR circuit (60), and “H” from the output terminal (OP2) of the combustion control device (38) (62) to which the post-purge signal is supplied, and inverters (61) and (62)
And a NOR circuit (63) having the output of the NOR circuit (63) as an input. The output of the NOR circuit (63) is supplied to the bases of the transistors (54) and (57) via diodes (64) and (65), respectively. The pump drive unit (40) is a combustion control unit (38)
A transistor (66) to which an "H" pump operation signal (a pre-purge command, a combustion command, and a post-purge command) is supplied from the output terminal (OP2) of the controller, and a circulating pump (9) connected in series to the transistor (66) And a relay (67). The proportional valve control device (41) includes a transistor (68) that is turned on when a combustion signal of “H” is supplied from the output terminal (OP3) of the combustion control device (38), and a NAND circuit (48). The energization amount control circuit (69) that changes the energization amount of the proportional valve (14) according to the output, and the energization amount of the proportional valve (14) at the beginning of the combustion signal output regardless of the output of the NAND circuit (48) And a timer circuit (70) for increasing the time.

When only the operation switch (30A) of the indoor unit (25A) is turned on and the thermo switch (32A) is turned 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, the heat source side control device (1
In the operation number discrimination device (36) of (6), a constant voltage is generated at the connection point (46), the transistor (55) is turned on, the relay (56) is energized, and the heat medium supply valve (10) is opened. become.
Also, the voltage V _C of the current terminal (71) is
A) and a combustion control device (38) via a diode (52)
Is supplied to the input terminal (IP) of the combustion control device (3
8) First, the fan motor (37) for driving the exhaust fan is started, the burner (2) is pre-purged, the pump operation signal is issued from the output terminal (OP1), and the transistor (66) is turned on. Power is supplied to the relay (67) to start the circulation pump (9). Next, the combustion control device (38) activates the ignition device (15) to open the shut-off valve (13), and at the same time, changes the output of the output terminal (OP3) from "L" to "H" to control the proportional valve. Transistor of device (41) (6
8) Turn on and activate the timer circuit (70). At this time, the proportional valve control device (41) uses the output of the timer circuit (70) to increase the energization amount of the proportional valve (14) and increase the valve opening regardless of the output of the NAND circuit (48). The burner (2) performs strong combustion. Thereafter, when the timer circuit (70) counts a predetermined time, the proportional valve control device (41) reduces the amount of electricity supplied to the proportional valve (41) by the "H" output of the NAND circuit (48), and reduces the valve opening. The burner (2) is weakened by making it smaller.

In this way, when the circulation pump (9) is operated based on the operation signal of the indoor side control device (29A) and combustion is performed in the burner (2), the heat medium heated in the heat exchanger (3) Is a heat medium tank (5), a circulation pump (9), an outgoing header (20), a heat medium supply valve (10), and a pipe connection port (21).
Through the fork (C1) and through the radiator (26A). The heat is exchanged with the indoor air sent by the blower fan (27A) and used for indoor heating. After that, the heat exchanger passes through the pipe connection port (17) and the return header (19). Returning to (3), the circulation is repeated with the solid arrow. Burner (2) at the beginning of heating regardless of the number of relay switches
Because of the strong combustion, not only the ignition is performed well, but also the temperature of the heat medium is rapidly increased, and the temperature of the room where the radiator (26A) is installed rises quickly. Further, only the heat medium supply valve (10) is opened corresponding to the relay switch (351A), thereby preventing waste heat radiation on the radiator (26B) side.
Further, when a predetermined time has elapsed from the start of the heating operation, the burner (2) performs weak combustion, and the amount of combustion is commensurate with the heating load. Therefore, the temperature of the hot air of the radiator (26A) may extremely rise. As the temperature of the heat medium rises, the temperature control device (not shown) for the heat medium operates, so that the burner (2) does not repeatedly start and stop.

When only the operation switch (30B) of the indoor control device (29B) is turned on and the thermo switch (32B) is turned on, and the operation signal is issued from the indoor control device (29B) to the heat source control device. This is also the case, and in this case, the heat medium supply valve (11) is opened. Then, the heat medium of the heat exchanger (3) circulates to the radiator (26B) as shown by the dashed arrow,
Used to heat the room where the radiator (26B) is installed.
The burner (2) performs strong combustion for a predetermined time and then performs weak combustion.

The operation switch (30) of the indoor control unit (29A) (29B)
A) When both (30B) are turned on and the thermoswitches (32A) and (32B) are on, the relay switch (351A)
(351B) turns on. In this case, the heat source side control device (1
In 6), the relays (56) and (59) are energized, and the heat medium supply valves (10) and (11) are opened. For this reason, the heat medium of the heat exchanger (3) is radiator (26) as shown by the solid and broken arrows.
A) It circulates to (26B) and is used for heating the room where the radiators (26A) and (26B) are installed. Since the two inputs of the NAND circuit (48) both become "H" and the output thereof becomes "L", the proportional valve control device (13) controls the proportional valve (13) independently of the output of the timer circuit (70). Make the burner (2) perform strong combustion by increasing the amount of electricity supplied in 14). As described above, when the operation signals are simultaneously sent from the indoor control devices (29A) and (29B) to the heat source control device (16), the combustion amount of the burner (2) increases, and the respective radiators (26A) It is possible to prevent a decrease in the temperature of the hot air in (26B), and it is possible to quickly raise the set temperature to room temperature.

The operation switch (30A) (30B) or thermo switch (32A) (32B) turns off and the relay switch (351A)
When (351B) is turned off, the blower fans (27A) and (27B) stop. When both the relay switches (351A) and (351B) are turned off, the input terminal (I
Since the voltage V _C is no longer supplied to the P), the combustion control device (3
In step 8), the shutoff valve (13) and the proportional valve (14) are closed, and the operation of the exhaust fan (4) is continued for a predetermined time to perform post-purging of the burner (2). During this post-purge time, the combustion control device (38) issues a pump operation signal whose output terminal (OP1) is "H". Therefore, the operation of the circulation pump (9) is continued by the pump driving device (40). On the other hand, in the supply valve control device (39), the output terminal (OP
An “H” post-purge signal is generated from 2), and the inverter (6
The output of 2) becomes "L", the two inputs of the NOR circuit (60) are both "L", and the output of the inverter (61) becomes "L". The "H" output of the NOR circuit (63) is connected to the diode (64) (6
It is supplied to the transistors (54) and (57) via 5), and the heat medium supply valves (10) and (11) are both opened. Thereafter, when the prepurge is completed, the circulation pump (9) stops, and the heat medium supply valves (10) and (11) close.

As described above, according to the present embodiment, the indoor control device (29
A) The operation of the circulation pump (9) is continued for a predetermined time (for example, several tens of seconds) immediately after the operation signal of (29B) is lost and the combustion is stopped, and the heat medium supply valves (10) and (11) are turned off. The valve is opened to allow the heat medium to flow in the branch passages (C1) and (C2). Therefore, even when one of the radiators (26A) and (26B) is not used, the heat medium is allowed to flow for a long time in the branch passage (C1). (C
2) It is possible to prevent the heat medium from deteriorating and prevent the piping of the branch passages (C1) and (C2) from corroding. Moreover, since the heat medium is forcibly circulated using the post-purge time, the heat medium circulation path (C) can be protected without adding a new timer circuit.

(G) Effect of the Invention Since the present invention is configured as described above, a heat medium supply valve is provided in a branch passage so that a heated heat medium can be supplied only to a radiator requiring heating. In the device, even when any one of the plurality of radiators is not used, the heat medium can be prevented from staying in the branch for a long time, and the effects such as the deterioration of the heat medium and the corrosion of the heat medium circulation path can be prevented can be obtained. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a heating device showing one embodiment of the present invention, FIG. 2 is an explanatory diagram of an internal configuration of a control unit of the heating device, FIG.
The figure is a main part electric circuit diagram. (1) Heat source unit (2) Burner (3) Heat exchanger (9) Circulating pump (10) (11) Heat medium supply valve (16) Heat source side control device, (26A) (26B)…
... radiator, (29A) (29B) ... indoor control unit, (C)
... heat medium circulation path, (C1) (C2) ... branch path.

Claims (1)

(57) [Claims] 1. A heat medium circulation system, wherein 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 having a heater are connected in a ring shape. A roadside, a room-side controller that is provided in each of the plurality of radiators and emits an operation signal according to a heating load, and corresponds to the operation signal when any of these room-side controllers emits an operation signal. The heat medium supply valve is opened, the burner and the circulation pump are operated, and when the operation signal of the indoor side control device disappears, the operation of the circulation pump is continued for a predetermined time, and all the heat medium supply valves are opened. A heating device comprising: a heat source side control device to be valved.