JPH02213619A - Heating device - Google Patents

Abstract

PURPOSE:To suppress deterioration of a heating medium and corrosion of the piping of a heating medium circulating passage by a method wherein a heating medium feed valve responding to an operation signal from a control device on the indoor side is opened, a burner and a circulating pump are operated, and when output of operation signal is stopped, running of the circulating pump is continued for a given time, and all the heating medium feed valves are opened. CONSTITUTION:When a circulating pump 9 is run according to an operation signal from a control device 29A on the indoor side and a burner 2 performs combustion, a heating medium heated by a heat exchanger 3 enters a heating medium tank 5, the circulating pump 9, and a heating medium feed valve 10, and flows to a radiator 26A. The heating medium heat-exchanges with indoor air and is returned to a heat exchanger 3. When output of operation signals from the control devices 29A and 29B on the indoor side is stopped and for a given time starting from a time right after the stop of combustion, running of the circulating pump 9 is operated, the heating medium feed valves 10 and 11 are opened, and a heating medium is forced to flow to branch passages C1 and C2. Even when one of radiators 26A and 26B is not used, the heating medium can be prevented from residence in the branch passages C1 and C2 for a long period, deterioration of the heating medium and corrosion of the piping of the branch passages C1 and C2 are prevented from occurring.

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 in a heat exchanger heated by a burner through a plurality of radiator bombs.

(b) Prior art 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 to open a heat medium supply valve and supply a heat medium (water, antifreeze, etc.) from a heat exchanger to a radiator to heat the room.

(C) Problems to be Solved by the Invention By the way, since the heating device described above is provided with a heat medium supply valve in the branch path, the heat medium is not supplied to the radiator that does not require heating, resulting in wasted heat radiation. On the other hand, if any of the heat radiators is not used for a long period of time, there is a risk that the heat medium remaining in the branch path may deteriorate or rust may occur in the heat medium circulation path.

This invention was made in view of the above facts,
In systems that perform heating by circulating the heat medium from a heat source device to multiple radiators via a heat medium supply valve, even if any of the radiators is not used for a long period of time, the quality of the heat medium or the heat medium circulation path may deteriorate. The purpose is to suppress corrosion of piping.

(d) Means for Solving the Problems This invention includes a heat exchanger that is built in a heat source device and is heated by a burner, a circulation pump, a heat medium supply valve, and a plurality of branch passages 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 one of these indoor control devices that issues an operation signal. When there is no operation signal from the indoor control device, the heating medium supply valve corresponding to the operation signal is opened and the burner and circulation pump are operated, and when the operation signal of the indoor control device is no longer available, the operation of the circulation pump is continued for a predetermined period of time. , and a heat source side control device that opens all heat medium supply valves.

<Thursday> Effect: With this configuration, when any of the indoor control devices is issuing an operation signal, the heating medium is supplied only to the radiator that requires heating, and wasteful heat radiation is prevented. Instead, immediately after the operation signal disappears, the circulation pump continues to operate for a predetermined period of time, and all heat medium supply valves are opened. The heat medium can be prevented from staying in the branch path, and deterioration of the heat medium and corrosion of the heat medium circulation path (particularly the branch path) can be suppressed.

〈〈〉Example〉 Hereinafter, embodiments of the present invention shown in the drawings will be described.

In Figure 1, (1) is a heat source device installed outdoors, and heat source device <1> includes a burner (2) and this burner (2).
) and an exhaust fan (4) heated by a heat exchanger (3) and an exhaust fan (4
), a heat medium tank (5), and this heat medium tank (5)
The pressure regulating valve (6) of the radiator cap (6) attached to
7) connected to the heat medium tank (5), the circulation pump (9), two normally closed heat medium supply valves (10) m), and the burner (2). A connected gas pipe (12), a cutoff valve (13) and a proportional control valve (14) provided in the gas pipe (12), and an ignition device (IS) provided near the burner (2); Heat source side control device (
16〉 is built-in. In addition, there are two piping connection ports (
17) (1g), 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 connection ports (21) < 22) are sequentially connected by piping, and these constitute a heat medium circulation path (C) on the heat source device (1) side. In addition, a heat medium tank (5
) is provided with a liquid supply port (23), and this liquid supply port (
23) has a built-in check valve (24). This check valve (24) is operated under pressure (for example, Q, 3 kg/c) in the direction of the arrow.
m" or more), it allows the heat medium to flow in that direction and blocks the flow of the heat medium in the opposite direction to the arrow. (25A) and (25B) are installed indoors, respectively. It is an indoor unit such as a fan convector that can be heated, and the indoor units (25A) (25B) are equipped with a heat radiator (26A>(
26B>, ventilation fan (27A) (27B), room temperature thermistor (28A) (28B), and indoor control device (2
9A) (29B) are built-in. And the radiator (
26A (26B) is connected to the heat medium circulation path (C) via a 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) that turns on (32B) (3
3B), fan motors (34A) (34B) for driving ventilation fans (27A) (27B), and relays (35A) (35B) whose energization is controlled by an operation switch and a thermoswitch.

On the other hand, the heat source side control device (16) is connected to the relay (35A) (
Relay contact (351A) (35B) that opens and closes at (35B)
Input the contact signal (operation signal) of 1B> and turn on the indoor unit (25
A) (25B) A device for determining the number of operating units (36) that determines whether or not the unit is in operation, and when the device (36) for determining the number of operating units determines that the number of units in operation is one or more, issues a blipurge command and activates the exhaust fan (4). ) The fan motor (37) for driving is energized, and then a combustion command is issued to activate the cutoff valve (13) and the proportional valve (
14) and the ignition device (15) in a predetermined sequence;
) A pump drive device (39) that operates the circulation pump (9) in response to a pump operation command from the heat medium supply valve (10) (1
A supply valve control device (4) that energizes 1) and opens them.
0) and the output signal of the operation number determining device (38) corresponding to the number of loop contacts (351A) (351B) turned on when the combustion control device (38) is issuing a combustion command, the proportional valve (14) Proportional valve control device (41) that adjusts the valve opening degree
). In addition, the supply valve control device (40) stops inputting the operation signal to the operation number determination device (36).
Moreover, a circuit is built in to open the heat medium supply valve (10)m) when the combustion control device (38) issues a boss purge command for a predetermined period of time.

Figure 3 shows the operation number determination device (36) and the pump drive device (36).
39), supply valve control device (40) and proportional valve control device (
41) shows the internal circuit. The operating number control device (36) is a relay switch (351A) and a resistor (42).
and a constant voltage element (43), and a relay switch (35)
1B), a series circuit of a resistor (44) and a constant voltage element (45), a NAND circuit (48) whose input is the voltage signal of the connection points (46) and (47), and a series circuit of the connection points (50 and 51). “H
11 voltage signal to the input terminal of the combustion/control device (38) (
Two diodes (52) (53) supplying IP)
It is made up of. The supply valve control device (39) also includes a pair of transistors (54) (55) with an OR configuration, a relay (56) for controlling the heat medium supply valve (10) connected in series with these transistors, and a relay (56) with an OR configuration. A pair of transistors (57) (58), a relay (59) for controlling the heat medium supply valve (11) connected in series to these, and a node whose input is the voltage signal of the connection point (46) (47). Circuit (6
0) and an inverter (6
1) and an inverter (62
) and a NOR circuit (63) whose inputs are the outputs of the inverters (61) and (62), and the outputs of the NOR circuit (63) are connected to the transistors (54) and (65) via diodes (64 and 65), respectively. 57). The pump driving device (40) also includes a transistor (66) to which an "H" pump operation signal (at the time of a pre-purge command, a combustion command, and a boss purge command) is supplied from the output terminal (OF2) of the combustion control device (38). , and a relay (67) for controlling the circulation pump (9) connected in series thereto. The proportional valve control device (41) also includes a transistor (68) that turns on when a combustion signal of “HIt” is supplied from the output terminal (OF2) of the combustion control device (38), and an output of the NAND circuit (48). Regardless of the output of the energization amount control circuit (69) that changes the energization amount of the proportional valve (14) according to the output of the NAND circuit (48), the energization amount of the proportional valve (14) is initially Increased timer circuit (70)
It is equipped with

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 (2
7A> is driven. 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 (5
5) is turned on, the relay (56) is energized, and the heat medium supply valve (10) is opened. In addition, the voltage Vc of the power supply terminal (71) is applied to the combustion control bag via the relay switch (351A) and the diode (52). (38) input terminal (I
P), the combustion control device (38) first
Start the fan motor (37) for driving the exhaust fan,
The burner (2) is caused to perform bripurge, and a pump operation signal is issued from the output terminal (OPI) to turn on the transistor (66) and energize the relay (67) to start the circulation pump (9). Next, the combustion control device (3
8) activates the ignition device (15) and opens the cutoff valve (13), while at the same time changing the output of the output terminal (OF2) to “L”.
II to "H", turning on the transistor (68) of the proportional valve control device (41) and operating the timer circuit (7o). At this time, the proportional valve control device (4
In 1), regardless of the output of the NAND circuit (48), the output of the timer circuit (70) increases the amount of current flowing through the proportional valve (14) and increases the valve opening, so the burner (2) Twisting is performed. Thereafter, when the timer circuit (70) measures a predetermined time, the proportional valve control device (41) reduces the amount of current flowing through the proportional valve (41) using the HIT output of the NAND circuit (48), and reduces the opening degree of the proportional valve. Burner (2)
cause a weak 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 by the heat exchanger (3) is heated. are the heat medium tank (5), circulation pump (9>, outgoing header (20), heat medium supply valve (10), and piping connection port (
21), enter the branch path (C1), and enter the radiator (26A
) flows. Here, it exchanges heat with the indoor air sent by the ventilation fan (27A) and is used for indoor heating.
) to the heat exchanger (3) and repeat the circulation as 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, which not only ensures good ignition, but also rapidly raises the heat medium temperature, making it difficult to install a radiator (26A). The room temperature rises quickly in a dry room.

In addition, only the heat medium supply valve (10) is opened in response to the relay switch (351A), and wasteful heat radiation on the radiator (26B) side is prevented. 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 radiator (26)
A) When the temperature of the hot air rises extremely or the temperature of the heat medium rises, the heat medium temperature control device (not shown) is activated.
The burner (2) does not repeatedly start and stop frequently.

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 a heat radiator (26B) as shown by the dashed arrow.
The heat is circulated through the air and used to heat the room where the radiator (26B) is installed. Further, the burner (2) performs strong twist firing for a predetermined time and then performs weak combustion.

When the operation switches 30A and 30B of the indoor control device (29A) and (29B>) are both turned on and the thermo switches (32A and 32B) are turned on, the relay switches (351A and 351B) are turned on. Become. In this case, the heat source side control device (16) uses relays (56) (59).
is energized, and the heat medium supply valve <10) (11) is 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. Also, both of the two outputs of the NAND circuit (48) become “H” and the output becomes “L It,” so
The proportional valve control device (13) increases the amount of current flowing through the proportional valve (14) regardless of the output of the timer circuit (70), causing the burner (2) to perform strong twist firing. In this way, when the operation signals are simultaneously sent from the indoor side control device (29A>(29B) to the heat source side control device (16), the combustion amount of the burner (2) increases, so each radiator (26A) (26B
), it is possible to prevent the temperature of the hot air from decreasing, 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 ventilation fan (27A) (27B> stops. When the switches (351A) and (351B> are both turned off, the voltage V is applied to the input terminal (UP) of the combustion control device (38).
Since c is no longer supplied, the combustion control device (38) closes the cutoff valve (13) and the proportional valve (14), continues to operate the exhaust fan (4) for a predetermined period of time, and turns off the burner (2).
Perform a boss purge. During this boss purge time, the combustion control device (38) outputs a pump operation signal whose output terminal (OPI) is "HIt".

Therefore, the pump drive device (40) continues to operate the circulation pump (9). On the other hand, in the supply valve control device (39), a boss purge signal of "H11" is issued from the output terminal (OF2), and the output of the inverter (62) is "L".
”, both the two-man power of Noah circuit (60) are ``L''
Then, the output of the inverter (61) becomes "L", and the "H" output of the NOR circuit (63) becomes the "H" output of the diode (64) (6
5) to the transistors (54) and (57), and the heat medium supply valves (10) and (11) are both opened. Thereafter, when the blip-purge ends, the circulation pump (9) is stopped and the heat medium supply valves (10) (11-) are closed.

In this way, according to this embodiment, the indoor control device (29
A) For a predetermined period of time (for example, several tens of seconds) immediately after the operation signal of (29B) disappears and combustion stops, the circulation pump (9)
The operation of the heat medium supply valves (10) (11) is continued.
) was opened to allow the heat medium to flow through the branch paths (C1) and (C2), so even if either one of the radiators (26A) (26B) was not used, the heat medium would continue to flow through the branch paths (C1) and (C2) for a long period of time. It is possible to prevent the heating medium from stagnation in C1) and (C2), and to prevent the heat medium from changing in quality and the pipes of the branch paths (C1 and C2) from corroding. Moreover, since the heat medium is forcibly circulated using the boss purge time, the heat medium circulation path (C) can be protected without adding a new timer circuit.

(G) Effects of the Invention Since this invention is configured as described above, a heat medium supply valve is provided in the branch path so that the heated heat medium can be supplied only to the radiator where heating is required. Even if one of the multiple heatsinks is not used in a product,
It is possible to prevent the heat medium from staying in the branch path for a long period of time, and it is possible to prevent deterioration of the heat medium and corrosion of the heat medium circulation path.

[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 the internal configuration of a control section of the heating device, and FIG.
The figure is also a main part electrical circuit diagram. (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, (C)
...heat medium circulation path, (CL) (C2)...branch path.

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 when any of these indoor control devices is emitting an operation signal, a heat medium supply corresponding to that operation signal. A heat source that opens a valve, operates a burner and a circulation pump, and continues to operate the circulation pump for a predetermined period of time when the operation signal of the indoor control device disappears, and opens all heat medium supply valves. A heating device characterized by comprising a side control device.