JP2964066B2 - Hot water heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hot water heating system, and more particularly to a hot water circulation type hot water heating system.

[0002]

2. Description of the Related Art FIG. 1 shows an example of the above-mentioned hot water heating system. This is the heat exchanger of the heat exchanger (A)
A hot water circulation path is formed between (1) and a heat radiating device (U) for heating, and a cistern (3) and a circulation pump (P) are interposed in the hot water circulation path. The hot water heated in (1) is supplied to the radiator (U) by this hot water circulation path and used as a heat source for heating.
It returns to (1) and is heated. In the cistern (3),
An overflow pipe (31) for draining excess water when the water level exceeds a predetermined level due to the expansion of hot water is provided.In this cistern (3), a low water level detection sensor (3a) and a high water level detection sensor (3) are provided. 3b) is provided. When the water level drops due to evaporation or the like and the low water level detection sensor (3a) outputs, water supply is started from the water supply pipe (32) provided in the cistern (3), and the high water level detection sensor (3b) is started. ) Output is stopped when water is output. This allows
The amount of water in the hot water circulation path is always kept constant, and the volume expansion of the water in the hot water circulation path is absorbed.

On the other hand, as shown in FIG. 2, recently, in order to improve the heat exchange efficiency, the heat exchanger (1) absorbs heat until the combustion exhaust gas from the burner (B) falls below the dew point.
A condensing type heat exchange device (A) has been realized, and it is conceivable that this heat exchange device (A) is employed in the above-mentioned hot water heating system. However, in this condensing type heat exchanger (A), dew condensation water (drain) is actively generated in the water pipes and fins of the heat exchanger (1), and the amount of the drain is large. The exchange device (A) is provided with a drain discharge path (K) for discharging the drain out of the device. This drain discharge path (K) is connected to a drainage system outside the system.

[0004]

However, since the drain contains an acidic corrosive component such as nitrogen oxides generated by the combustion of the burner (B), the drainage piping is made of metal pipe. In this case, there remains a problem that the pipe is easily corroded. The invention according to claim 1 provides a heat exchanger (A) including a heat exchanger (1) that generates heat by exchanging heat until the combustion exhaust gas of the burner becomes lower than the dew point; A hot water circulation path formed between the apparatus (U) and the heat exchanger (1); and a cistern (3) provided to maintain a predetermined amount of water in the hot water circulation path. In the hot water heating system in which the exchange device (A) is provided with a drain discharge path (K) for discharging the drain outside the device, even if the drainage piping outside the system is a metal pipe, this drainage It is an object of the present invention to provide a hot water heating system that is not corroded by water.

[0005]

Means for Solving the Problems [Invention of claim 1] The invention of claim 1 is based on the description of "a drain discharge path (K) of a heat exchanger (A) and an overflow pipe (31) of a cistern (3)". And drain connection route (K) of the heat exchange device (A)
Insert the drain container (2) into the
(2) has a configuration in which a siphon (22) for discharging a certain amount of the drain is provided downstream of the drain discharge path (K) when the stored water level of the drain reaches the set water level, and the siphon (22) Detecting means (S) for detecting operation, and this detecting means
A control means (R) that activates a water supply means (G) for supplying water to the cistern (3) and draining it to the overflow pipe (31) according to an output signal from (S) and stopping operation after a set time has elapsed.
Is provided.] In this device, since the drain discharge path (K) of the heat exchanger (A) and the overflow pipe (31) of the cistern (3) are connected together, the drain discharge path (K )
On the downstream side of the junction of the drain discharge path (K) and the overflow pipe (31), it is diluted by the wastewater flowing through the overflow pipe (31), and the concentration of the corrosive component is greatly reduced. Then, when the siphon (22) of the drain container (2) operates, an output signal from the detection means (S) is input to the control means (R). Since the control means (R) is configured to put the water supply means (G) into an operating state by the signal input and stop the operation after a lapse of a set time, every time the drain is discharged from the drain container (2), the overflow pipe (R) is used. Drained to 31).

[Invention of Claim 2] The invention of Claim 2 is the invention of Claim 1 described above.
"The set time is set to be equal to or longer than the operation time of the siphon (22)". In this one, drain container
During drain discharge from (2), drainage from overflow pipe (31) is continued. [Invention of claim 3] The invention of claim 3 is the invention according to claim 1 or 2, wherein the "drain discharge path (K) of the heat exchange device (A)"
And a drain container (2) having a drain neutralizing function is inserted into the container. In this one, heat exchange device (A)
The drain discharged from the drain into the drain discharge path (K) is neutralized by a drain neutralizing function provided in the drain container (2) when passing through the drain container (2).

[0007]

As described above, the concentration of the corrosive component contained in the drain is significantly reduced downstream of the junction of the drain discharge path (K) of the heat exchange device (A) and the overflow pipe (31) of the cistern (3). Therefore, corrosion of drainage piping outside the system is prevented. Also, when installing this hot water heating system, it is only necessary to install either the drain discharge path (K) or the overflow pipe (31) up to their junction, so that both of these pipes are connected to the drain pipe outside the system. The piping is shorter than when installing up to Therefore, it is possible to reduce the number of piping parts and piping man-hours, thereby reducing costs. Then, each time the drain is discharged from the drain container (2), the drain is drained to the overflow pipe (31), so that the above-mentioned drain dilution is efficiently performed. According to the second aspect of the present invention, during drain discharge from the drain container (2), the overflow pipe (31)
Since the drainage from the water is continued, the above-mentioned drain dilution effect is further improved.

According to the third aspect of the present invention, the drain discharge path (K)
When the drain discharged to the tank passes through the drain container (2),
It is neutralized by the drain neutralizing function provided for this. Therefore, the outflow of the corrosive component to the downstream side of the drain container (2) is reduced, and the effect of reducing the concentration of the corrosive component by the dilution is further improved.

[0009]

[0010]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] In Embodiment 1, as shown in FIG. 3, a hot water circulation path is formed between a so-called condensing type heat exchanger (A) and a heat radiator (U) for heating. The present invention is applied to a hot water heating system, and the hot water circulation path is provided with a cistern (3) for maintaining a predetermined amount of water and absorbing a volume expansion of water in the hot water circulation path. Drain discharge route from heat exchanger (A)
In (K), a drain container (2) having a drain neutralizing function is inserted.

[Configuration of Each Part] ** Heat exchange device (A) ** The heat exchange device (A) is located in a can body (10), a burner (B), and below the burner (B), and mainly comprises combustion exhaust gas. A main heat exchanger (1a) that absorbs the sensible heat and exchanges heat, and a sub-heat exchanger (1b) that mainly absorbs the latent heat of the combustion exhaust to exchange heat, and the can body (10) ) From the fan (F) connected to the upper end of the burner (B).
Supply combustion air to the burner (B),
Heat is exchanged with water in a water pipe penetrating the main and sub heat exchangers (1a) and (1b) through a number of fins, and the combustion exhaust gas is supplied to a lower end of the can body (10). Exhaust path (1
It is configured to exhaust from 1). The sub heat exchanger (1b) is located below the main heat exchanger (1a), and
It is connected in series downstream of the exhaust gas of (1a). As the burner (B), an all-primary air type is used.

The bottom of the can (10) is a funnel (13) for collecting the drain dropped from the heat exchanger, and a drain discharge pipe (12) connected to the lower end thereof. Is inserted into a drain container (2) described later. ** Drain container (2) ** Inside the drain container (2), the drain inflow chamber (23) into which the drain discharge pipe (12) is inserted from above and the upper end of the drain inflow chamber (23) A storage chamber (21) for communicating with and storing the drain and a siphon (22) for discharging the drain from the storage chamber (21) are arranged in parallel. The siphon (22) has a vertically long chamber (25) communicated with the storage chamber (21) at the lower end thereof, and penetrates the bottom plate into the chamber (25) and faces upward. The central pipe (26) inserted into the chamber (26) is inserted between the upper end of the central pipe (26) and the top plate (25a) of the empty room (25). In consideration of the tension and the speed at which the water level of the drain rises, a gap (for example, 5 mm) is formed so as not to cause air pockets. or,
In the storage chamber (21), for neutralizing drain, for example,
A neutralizing agent (21a) composed of granules of magnesium oxide and calcium carbonate is contained, and the top plate of the storage chamber (21) is
A lid plate that is set higher than the top plate (25a) of the empty room (25) and that is opened and closed when replacing or replenishing the neutralizing agent.
(27) is provided. The cover plate (27) is provided with a through hole (24) for opening to the atmosphere. Further, the central pipe (26)
Is formed to extend downward and join in the middle of an overflow pipe (31) of a cistern (3) described later.

In the storage room (21), the empty room
(25) It is placed at the height below the top plate (25a), and siphon (2
A first water level switch (S ₁ ) for detecting a stored water level when a drain discharge operation to be described later according to 2) is started, and
(25) heat exchange apparatus at a position higher than the top plate (25a) the water pipe of (A) a second water level switch water leakage (10a) detects an abnormal water level when the generated (S ₂₎ is provided with ing. A temperature sensor (S ₃ ) for detecting the temperature of the drain container (2) and a heater (H) for heating the inside of the drain container (2) are provided on the bottom plate of the drain container (2). It is attached. The first and second water level switches (S ₁ ) and (S ₂ ) and the temperature sensor (S ₃ )
The heater (H) is connected to a control device (C) described later.

** The cistern (3) and the radiator (U) ** The cistern (3) is provided on the return path from the radiator (U) to the heat exchanger (A) in the hot water circulation path. Downstream of (3), a circulation pump (P) is provided. The stern (3) includes an overflow pipe (31) for draining surplus water when the stored water level becomes a predetermined level or more, and a water supply pipe (32) for supplying tap water to the stern (3). ). The water supply pipe
(32) is provided with a solenoid valve (G ₁ ) as a water supply means (G) according to claim 1 described above. In addition, this cistern (3)
Inside, a low water level detection sensor (3a) and a high water level detection sensor (3b) are provided.
When the inside water level falls below a predetermined water level, the low water level detection sensor (3a) detects it and opens the solenoid valve (G ₁ ) to supply water, and the high water level detection sensor (3b) detects water level. Thus, the water supply is stopped by closing the solenoid valve (G ₁ ). In addition, the high water level detection sensor (3b)
Is substantially matched with the water level at the time of overflow drainage from the overflow pipe (31). The function of maintaining the amount of water in the cistern (3) ensures the amount of circulating water in the hot water circulation path and absorbs the volume expansion of water in the hot water circulation path. The cistern (3) removes air mixed in the hot water circulation path.

Further, the central pipe (26) is connected in the middle of the overflow pipe (31). A route from the drain discharge pipe (12) to the junction is a drain discharge route (K) according to the above-mentioned claim. Further, as the heat radiator (U), a blower or a floor heating device configured to blow air to a heat exchanger for heat radiation connected to the hot water circulation path to blow warm air for heating is adopted.

** Control device (C) ** The operation of this hot water heating system is controlled by a control device (C) incorporating a microcomputer, and the control device (C) includes a medium. It has a wad change timing detecting function unit, a water leak detecting function unit, and a freezing preventing function unit. Specifically, the neutralizing agent replacement time detecting function unit includes a neutralizing agent replacement time detecting routine (J ₁ ) stored in the microcomputer described later, and the water leak detecting function unit includes a water leak detecting routine (J ₂ ), And the anti-freezing function unit is realized by an anti-freezing routine (J ₃ ). In addition, the control device
(C) is supplied with electricity by turning on the power of the hot water heating system (connecting the power plug).

[Actual Operation] Next, the actual operation of the hot water heating system will be described with reference to the flowcharts of FIGS. As shown in the flow chart of FIG. 5, when the operation switch (not shown) of the hot water heating system is turned on (step (52)), the hot water heating system is operated (step (53)), and the following description will be given. The neutralizing agent replacement timing detection routine (J ₁ ) and the water leak detection routine (J ₂ ) are executed and continued until the operation switch is turned off (step (54)). When the operation switch is turned off, a freeze prevention routine (J ₃ ) described later is executed.

Hereinafter, the operation of the hot water heating system and each routine will be described in detail. ** Operation of hot water heating system ** In this hot water heating system operating condition, heat exchange device (A)
The fan (F) and the burner (B) are operated, and the combustion exhaust gas supplied downward from them activates the main heat exchanger (1) first.
a) is heated, the main heat exchanger (1a) absorbs sensible heat from the combustion exhaust gas, then the sub heat exchanger (1b) absorbs latent heat, and then is exhausted from the exhaust path (11). You. Then, since the circulation pump (P) operates, the hot water heated by the heat exchanger is supplied to the radiator (U), and the radiator (U)
The living room is heated by the heat radiation in (U). Further, the hot water whose temperature has been lowered due to the heat radiation returns to the heat exchanger via the cistern (3) and is reheated. The heating is continued by the series of hot water circulation.

In this operating state, since the combustion exhaust gas is cooled below the dew point by the latent heat absorption in the sub heat exchanger (1b), a large amount of water flows through the water pipes and fins of the sub heat exchanger (1b). Drain occurs. This drain is dropped and collected by the funnel (13) of the can (10), and the drain discharge pipe (1
Through 2), it flows into the drain inflow chamber (23) of the drain container (2). After the drain fills the drain inflow chamber (23), it overflows and flows into the storage chamber (21) to be stored. Further, the drain fills the empty space (25) of the siphon (22) when the predetermined water level is reached in the storage room (21), as shown in FIG. At this time, the gap between the top plate (25a) of the empty room (25) and the central pipe (26) is filled with the drain, and the upper end opening of the central pipe (26) is closed by the surface tension of the drain. Become. Thereafter, the closed state due to the surface tension of the drain is broken and flows into the central pipe (26).
Thereby, the drain in the empty chamber (25) and the storage chamber (21) is sucked into the central pipe (26), and the drain container (2)
Is discharged from Then, as shown in FIG. 4B, when the drain in the storage chamber (21) decreases and air enters the empty chamber (25) through the through hole (24), the central pipe ( 26) The suction negative pressure into the inside disappears, and the drain discharge ends (the state of FIG. 4C). Therefore, in the drain container (2), a constant amount is discharged by the siphon (22) each time the drain in the storage chamber (21) reaches the predetermined storage amount.

Further, since the downstream end of the central pipe (26) is connected in the middle of the overflow pipe (31) of the cistern (3), the drain discharged from the drain vessel (2) is It flows from the central pipe (26) to the downstream part of the overflow pipe (31) and flows out to a drain pipe outside this system.
In this case, the drain is diluted by overflow drainage from the cistern (3), so that the concentration of corrosive components in the drain is greatly reduced. Moreover, the drain container (2) is provided in the drain discharge path, and while the drain is temporarily stored in the storage chamber (21), the drain container (2) is acidified by the neutralizing agent contained therein. Is neutralized. Therefore, the dilution effect is further improved. Furthermore, in this hot water heating system, it is only necessary to install the central pipe (26) up to the junction with the overflow pipe (31). Therefore, compared with the case where the central pipe (26) is extended to the drain pipe outside the system, the pipe is shorter, and the piping parts and the number of piping steps are reduced. still,
In this embodiment, the drain container (2) is provided in the drain discharge path (K), but the drain container (2) may not be provided.

** Neutralizer Replacement Timing Detection Routine (J ₁ ) ** In the neutralizer replacement timing detection routine (J ₁ ), as shown in the flowchart of FIG. When the first water level switch (S ₁ ) is turned on by the water level (step (61)), 1 is added to the variable (I) (step (62)). By repeating this, the number of times of detection signals output from the first water level switch (S ₁ ) is accumulated. When the variable (I) reaches a set value, that is, when the cumulative number reaches the set number, the control device
(C) outputs a notification signal.
The ED (L ₁ ) is turned on, whereby the neutralizing agent exchange is displayed (steps (63), (64)). When the reset switch (not shown) is pressed after replacing the neutralizing agent, the replacement signal is extinguished, the LED (L ₁ ) is turned off, and the variable (I) is returned to 0. (Steps (65), (66), (6
7)). The variable (I) is set to 0 immediately after the control device (C) is turned on, as shown in the flowchart of FIG. 5 (step (51)).

In this case, the drainage is determined by the cumulative number of times.
Total amount of drain passing to the container (2), that is, neutralization by this
Because the degree of use of the agent can be determined,
By judging, it is possible to properly know when to replace the neutralizing agent
It will be. ** Water leak detection routine (J_Two) ** This leak detection routine (J_Two), The flow chart of FIG.
As shown in the figure, the main heat exchanger (1a) and the sub heat exchanger (1b)
Water leaks are monitored. In other words, the storage room (2
The amount of drain stored in 1) becomes larger than usual,
Water level switch (S _Two) Is turned on (step (71)).
Check the ON signal of the controller and a water leak signal is output from the control unit (C).
Force (step (72)), heat exchange
LED (L_Two) Is lit
You. In addition, this LED (L_Two) Lights up and the heat exchanger is repaired.
Press the reset switch (not shown)
Then, the display signal disappears and the LED (L_Two) Turns off
(Steps (73) and (74)).

In this case, when water leaks from the heat exchanger, the amount of drain stored in the storage chamber (21) is temporarily reduced.
Normal siphon operation storage amount (the first water level switch (S
_{Since the} storage amount is larger than the storage amount at which ₁ ) is turned on), the water leak at this time is detected by the second water level switch (S ₂ ), so that the water leakage can be recognized.

** Freezing prevention routine (J ₃ ) ** In this freezing prevention routine (J ₃ ), as shown in the flowchart of FIG. 8, the temperature detected by the temperature sensor (S ₃ ) is the first.
When the temperature falls below the set temperature (E ₁ ), the heater (H) is turned on (steps (81) and (82)). When the detected temperature becomes equal to or higher than the second set temperature (E ₂ ) due to the heating of the heater (H), the heater (H) is returned to the off state (step (83),
(84)).

In this case, since the drain vessel (2) is maintained within a predetermined temperature range by the heater (H), the drain vessel (2) is prevented from freezing and the drain vessel (2) is prevented from freezing. The decrease in the reaction of the neutralizing agent inside is prevented. Although not shown, a control program for performing the water supply operation to the cistern (3) is provided in addition to the control program of FIG. 5 described above. [Embodiment 2] This embodiment 2 is described with reference to FIGS.
As shown in FIG.
The following water supply control routine (J ₄ ) is added.

The water supply control routine (J ₄ ) is executed when the operation switch is turned on, as shown in FIG.
In this water supply control routine (J ₄ ), as shown in FIG.
First, a flag (F) indicating the open / close control state of the solenoid valve (G ₁ )
Is determined to be "0" (step (91)). If the flag (F) is "0" (when the solenoid valve (G ₁₎ is in the closed state)
It is determined whether the first water level switch (S ₁ ) for detecting the stored water level when the siphon operation is started is “ON” (step (92)), and when it is “ON”, that is,
When the siphon operation is started, the timer (T) built in the microcomputer is reset to start time measurement, the solenoid valve (G ₁ ) is opened, and the flag (F) is updated to “1” ( Steps (93), (94), (95)). By opening the valve, water is supplied from the water supply pipe (32) to the cistern (3). After this,
The water supply is continued until the measurement time (T ₁ ) of the timer (T) reaches the set time (T ₀ ) (step (96)), and when the set time (T ₀ ) is reached, the solenoid valve (G ₁ ) Close the valve and set the flag
(F) is updated to “0”. The set time (T ₀ ) is set slightly longer (for example, 10 seconds) than the operation time (for example, 7 seconds) of the siphon (22). In this apparatus, the water level detected by the high water level sensor (3b) substantially coincides with the overflow water level, so that overflow drainage from the cistern (3) is performed almost simultaneously with the start of water supply. In the water supply state according to the water supply control routine (J ₄ ), the water level detection from the high water level sensor (3b) is ignored.

In this case, the overflow drainage is performed almost simultaneously with the siphon operation, and the overflow drainage is continued at the time when the drain discharge is completed. Therefore, the above-mentioned drain dilution is performed reliably and efficiently. Becomes Note that the detection water level of the high water level sensor (3b) may be set lower than the overflow water level, and there may be a slight time difference between the start of the water supply and the overflow drainage.

In this embodiment, the first water level switch (S ₁ ) is provided with the detecting means (S) according to claim 1 and the steps (92) to (94), (96) and (97). Is the control means. In any of the above-described embodiments, the drain discharge path (K) is joined in the middle of the overflow pipe (31) extending to the drain pipe outside the system, but this drain discharge path (K) is connected to the drain pipe extending to the drain pipe. An overflow pipe (31) may be joined in the middle of (K). In this case, as shown in FIG.
A configuration in which the same drain container (2) as in the above embodiment is inserted into the drain discharge path (K), and the overflow pipe (31) is connected to the storage chamber (21) can be adopted. Incidentally, as shown in the figure, the neutralizing agent (21a) may be accommodated in the drain inflow chamber (23). In this case, while the drain is stored in the storage chamber (21), the dilution is performed by the overflow water from the overflow pipe (31), so that the dilution efficiency is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a hot water heating system according to a conventional technique.

FIG. 2

FIG. 3 is an explanatory diagram of a hot water heating system according to Embodiment 1 of the present invention.

FIG. 4 is an explanatory view of the operation of the siphon (22) of the drain container (2).

FIG. 5 is a flowchart showing a control program of a control device (C).

FIG. 6 is a flowchart showing a neutralizing agent replacement timing detection routine (J ₁ ).

FIG. 7 is a flowchart showing a water leak detection routine (J ₂ ).

FIG. 8 is a flowchart showing the freeze prevention routine (J ₃ ).

FIG. 9 is a flowchart showing a control program according to the second embodiment.

FIG. 10 is a flowchart showing the water supply control routine (J ₄ ).

FIG. 11 is an explanatory view of a modification.

[Explanation of symbols]

 (A) ・ ・ ・ Heat exchanger (1) ・ ・ ・ Heat exchanger (U) ・ ・ ・ Heat radiator (3) ・ ・ ・ Systern (2) ・ ・ ・ Drain container (K) ・ ・ ・ Drain discharge path (31) ・ ・ ・ Overflow pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-99939 (JP, A) JP-A-59-158941 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) C02F 1/00 F24D 3/10 F24H 1/00-1/52 F24H 9/00-9/20 F28F 17/00

Claims (3)

(57) [Claims] A heat exchanger for generating heat by exchanging heat until the combustion exhaust gas of a burner becomes equal to or lower than a dew point.
A hot water circulation path formed between the heat exchanger (A), the heat radiator (U) and the heat exchanger (1), and a predetermined amount of water in the hot water circulation path. And a cistern (3) provided for the heat exchange device (A).
A drain discharge path (K) for discharging the drain out of the device
In a hot water heating system equipped with a drain, the drain discharge path (K) of the heat exchange device (A)
(3) is connected to the overflow pipe (31), the drain container (2) is inserted into the drain discharge path (K) of the heat exchange device (A), and the drain container (2) Is provided with a siphon (22) for discharging a certain amount of the drain at the downstream side of the drain discharge path (K) when the water level reaches the set water level, and a detecting means (S) for detecting the operation of the siphon (22) ) And a control means (G) for supplying water to the cistern (3) based on the output signal from the detection means (S) and discharging the water to the overflow pipe (31), and stopping the operation after a set time has elapsed. R) and a hot water heating system. 2. The hot water heating system according to claim 1, wherein the set time is set to be longer than an operation time of the siphon (22). 3. A drain discharge path (K) of the heat exchange device (A).
The hot water heating system according to claim 1 or 2, further comprising a drain container (2) having a drain neutralizing function inserted therein.