JP2675731B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device provided with a gas-liquid contact portion for bringing water or hot water into contact with exhaust gas from a hot water supply burner in the course of supplying water or hot water to a portion to be supplied. .

[0002]

2. Description of the Related Art Conventionally, in a hot water supply apparatus of this type, an exhaust gas inlet provided in a gas-liquid contact portion for introducing the exhaust gas is
It is provided so as to be positioned lower than the exhaust outlet for discharging the exhaust gas, and the ejection means is configured to eject the water or hot water downward from the upper portion of the gas-liquid contact portion, The ejection means was configured to eject water or hot water from the downstream side in the exhaust gas flow direction of the hot water supply burner toward the upstream side at the gas-liquid contact portion.

FIG . 3 shows an example of a gas-liquid contact portion G in a conventional hot water supply device. The gas-liquid contact portion G has a plurality of ejection nozzles 27 as ejection means for ejecting water supplied from the water supply passage W3 downward from the upper portion of the gas-liquid contact portion G into a metal casing, and a stainless wire. And a filling layer 17 formed by braiding in a three-dimensional lattice shape,
The exhaust duct 12 of the hot water supply burner is connected below the packed bed 17 to form an exhaust gas introduction port 12a for introducing the exhaust gas of the hot water supply burner into the gas-liquid contact portion G, and the exhaust gas discharge port 18 is provided at the upper part of the casing. Is provided so that the hot exhaust gas from the hot water supply burner is introduced into the casing through the exhaust gas inlet 12a and passes through the packed layer 17 when rising toward the exhaust gas outlet 18 to heat the packed layer 17 to a high temperature. Then
In addition, it is configured to come into contact with the water jetted from the jet nozzle 27 to perform the heat exchange by dissolving the carbon dioxide in the exhaust gas and recovering the exhaust heat.

If the hot water that has passed through the gas-liquid contact portion G is supplied to the supplied portion B, for example, in a bathtub, a carbonated bath can be obtained.

[0005]

However, according to the above-mentioned prior art, the jetting means is constructed so as to jet water or hot water from the downstream side to the upstream side in the exhaust gas flow direction of the hot water supply burner. Therefore, the flow resistance of the exhaust gas of the hot water supply burner at the gas-liquid contact portion is increased by the jetted water or hot water, and the hot water supply burner due to the increase of the exhaust pressure of the exhaust path and the increase of the combustion chamber pressure. However, there is an inconvenience in that the exhaust amount of the hot water supply burner and the control of the hot water supply temperature are poor.

[0006] Furthermore, the flow direction at the gas-liquid contact part is
Direction, the dissolution of carbon dioxide in the exhaust and the heat recovery
In order to perform sufficient heat exchange due to absorption,
The contact part has a vertically long shape, and the entire water heater is
There was a problem of increasing the size in the direction.

An object of the present invention is to overcome the above conventional drawbacks.

[0008]

The characteristic configuration of the hot water supply apparatus according to the present invention is set forth in claim 1 of the scope of claims.
, A water supply route to the supply destination
Alternatively, the gas-liquid contact part that contacts the hot water and the exhaust of the hot water supply burner
The exhaust of the hot water supply burner is provided in the gas-liquid contact part.
Exhaust path parts are provided to allow flow in the lateral or inclined direction.
Water supplied to the exhaust passage from the passage or
Hot water is sprayed from the upstream side to the downstream side in the exhaust flow direction.
Ejection means for ejecting is provided and ejected from the ejection means.
Exhaust exhaust port that exhausts the exhaust gas that comes into contact with hot water or hot water
It is provided so as to be located below the exhaust path portion .

[0009]

According to the characteristic configuration of the present invention , the exhaust path portion is supplied.
Structure that allows exhaust gas from the hot water burner to flow in the lateral or inclined direction
Then, from the upstream side in the exhaust flow direction to the exhaust path portion.
Is there a jetting device that jets toward the downstream side?
, The part of the gas-liquid contacting part that directly comes into contact with the gas-liquid is the exhaust path.
It fits inside the part and suppresses the vertical dimension of the gas-liquid contact part.
At the same time, it is possible to secure a sufficient area for direct gas-liquid contact.
It is.

Further, the water or the water jetted from the jetting means
Gas and liquid contact because hot water and the exhaust flow in the same direction
Of increase in ventilation resistance of exhaust gas from hot water supply burner
it can.

Further , the exhaust outlet for discharging the exhaust is
Since it is located below the exhaust path,
The flow direction of the exhaust gas in the touching process is the exhaust gas flow path portion.
After passing through the minute, the direction is changed and the water or hot water and
Separation from the air is good in a limited narrow space.
I can do it.

Further, an exhaust inlet for introducing the exhaust to the gas-liquid contact portion, for positioning the upper than the exhaust outlet for discharging the exhaust, for example, a path for supplying water or hot water to the feed section In some cases, foreign matter may become clogged, or the route may freeze in winter, blocking the flow of water or hot water from the gas-liquid contact part to the supplied part and raising the water level in the gas-liquid contact part. Also, as the water level reaches the exhaust outlet, it can overflow from the exhaust outlet, so that water or hot water does not reach the exhaust inlet.

[0013]

According to the characteristic configuration of the present invention ,
Without being bound by the vertical constraint in dimensional composition
It is possible to configure a long gas-liquid contact part,
Separation of water or hot water from the exhaust after touching is limited to a narrow space.
Since it can be done well in the space, try to downsize the device body.
, Dissolution of carbon dioxide in the gas-liquid contact area and recovery of exhaust heat
To provide a hot water supply device with sufficient heat exchange by
Can be.

By water or hot water jetted from the jetting means
Increased flow resistance of exhaust gas from hot water supply burner in gas-liquid contact area
Since it is not added, exhaust pressure in the exhaust path increases and
Error in combustion amount of hot water supply burner due to increase in pressure in the baking chamber
It does not cause the exhaust gas of the hot water supply burner.
In addition, the problem that caused the poor control of the hot water temperature was eliminated.
A hot water device can be provided.

Further , the water or
The flow of hot water is obstructed and the water level rises in the gas-liquid contact area.
However, water or hot water may reach the exhaust inlet.
Since there is no water or hot water through the exhaust path,
Of the hot water supply burner that spilled over into the combustion chamber
The hot water supply equipment eliminates the inconvenience of destroying the hot water supply device.
Can be provided.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a hot water supply device for supplying water or hot water to a bathtub B as a supply destination. The hot water supply device includes a hot water supply unit A that heats tap water supplied through the water supply passage W1 to supply hot water to the bathtub B and the hot water tap K, and a reheating unit C that reheats bathtub water in the bathtub B. A gas-liquid contact portion G that brings water or hot water into contact with the exhaust gas of the hot water supply burner 2, a water pool portion F that seals a path portion from the gas-liquid contact portion G to the bath B, and a controller that controls the operation of the water heater. It is composed of H and.

In the hot water supply unit A, there are provided a hot water supply heat exchanger 1 for supplying tap water through a water supply passage W1, a hot water supply burner 2 for heating the hot water supply heat exchanger 1, and a combustion air for the hot water supply burner 2. A blower fan 3 for blowing air is provided. The hot water supply burner 2 is provided with a fuel control valve 4 for adjusting the amount of fuel supplied to the hot water supply burner 2 and a fuel intermittent valve 5. The rotation speed of the blower fan 3 is controlled to a value uniquely determined according to the fuel supply amount so that the blower amount is such that the combustion state of the hot water supply burner 2 is optimized.

The reheating section C includes a reheating heat exchanger 6 provided in a circulation path W5 for circulating the bath water of the tub B, a reheating burner 7 for heating the reheating heat exchanger 6, and a reheating unit 7. It is composed of a blower fan 8 that blows the combustion air of the combustion burner 7.
A circulation pump 9 is provided in the circulation path W5. The reburning burner 7 is provided with a fuel control valve 10 for adjusting a fuel supply amount to the reburning burner 7 and a fuel intermittent valve 11. The blower fan 8 is controlled in the same manner as the blower fan 3 according to the additional heating burner 7.

An exhaust duct 12 of the hot water supply section A is connected to the gas-liquid contacting section G so that the exhaust gas of the hot water supply burner 2 passes through the hot and cold water. A hot water supply passage W2 that leads to the contact portion G, a water supply passage W3 that guides water from the water supply passage W1 to the gas-liquid contact portion G, and a connecting pipe 22 that constitutes a path portion from the gas-liquid contact portion G to the water pool portion F are provided. It is configured to be connected and relay a route for supplying hot water from the hot water supply unit A to the bathtub B.

In the water pool F, a connecting pipe 22 and a hot water supply passage W4 for guiding the hot water passing through the water pool F to the bathtub B are connected to supply hot and cold water from the gas-liquid contact part G to the bathtub B. It is configured to relay the route.

In the hot water supply apparatus, first, the hot water supply passage W1, the hot water supply heat exchanger 1, the hot water supply passage W2, the connecting pipe 22, the water pool portion F, and the hot water supply passage W4 are used to boil the water. A hot water supply path is configured so that hot water is appropriately supplied to the bathtub B.

The water supply passage W1 is provided with a thermistor S1 for detecting the water supply temperature Ti in the water supply passage W1 and a water amount sensor S2 for detecting the water supply amount Q from the water supply passage W1. The hot water supply path W2 is provided with an intermittent valve 13,
The supply of hot water from the hot water supply heat exchanger 1 to the bathtub B is controlled. The connecting pipe 22 is provided with a water flow drive valve 23 as an opening / closing means for opening and closing the flow of the path, and a thermistor S3 for detecting an actual hot water supply temperature Tx for the bath B.

The hot water supply passage W2 has a branching hot water supply passage W6.
Is provided so that hot water boiled by the hot water supply burner 2 can be supplied to the hot water tap K as needed to perform general hot water supply. The hot water supply path W6 is provided with a water amount sensor S4 for detecting opening of the hot water tap K.

Further, in the hot water supply device, a water supply passage W1, a water supply passage W3, a gas-liquid contact portion G, a connecting pipe 22, and a water pool portion F.
And the hot water supply passage W4, the carbon dioxide contained in the exhaust gas of the hot water supply burner 2 is melted by passing through the gas-liquid contact portion G, and the hot water heated by the high temperature exhaust gas is supplied to the bathtub B. A route for supplying carbonic acid hot water that is appropriately supplied is configured.

The water supply passage W3 is provided with an on / off valve 14 so that the water supply for carbon dioxide hot water supply to the gas-liquid contact portion G is controlled. In addition, when the carbonated hot water supply is performed, the hot water supply is also performed simultaneously from the path in which the hot water supply is performed. It is configured to be supplied.

The control unit H is mainly composed of a microcomputer, to which the thermistors S1 and S3 and water amount sensors S2 and S4 are connected, and the detection information of these sensors is input and the fuel control valve 4 is also provided. , 1
0, the fuel interrupt valve 5, 11, the blower fans 3, 8, the circulation pump 9, the interrupt valves 13, 14, the water flow drive valve 23, and the controller 15 are connected, so that the combustion of the hot water supply burner 2 and the path Supply of water or hot water to
In addition, control means 101 for controlling various other operations of the hot water supply device is configured.

The controller 15 includes a hot water supply switch 15a, a carbonated water supply switch 15b, and a target hot water supply temperature T.
target hot water supply temperature setting switch 15c for setting s, and
An additional hot water supply switch 15d and the like are provided.

FIG. 2 shows the gas-liquid contact portion G in this embodiment.
And the water pool F is shown. In the gas-liquid contact part G,
Exhaust gas from the hot water supply burner 2 is laterally placed in the metal casing.
An exhaust path portion 25 is provided to allow the air to flow through the
Connected to the exhaust duct 12 at the upstream end of the road portion 25
The exhaust gas inlet 12a is formed. Exhaust path section
In the vicinity of the exhaust introduction port 12a of the minute 25, the water supply passage W3
The water supplied from the same lateral direction as the exhaust flow direction.
A jet nozzle 16 for jetting toward the mist is provided.
You. Further, the downstream end of the exhaust path portion 25 is downward.
Open toward and open the opening with stainless steel wire
A packing layer 17 formed into a braided shape is provided, and the packing layer 1
The exhaust outlet 18 for discharging the exhaust gas that has passed through
It is provided so as to be located below the air path portion 25 .

Therefore, the gas-liquid contact portion G is the hot water supply burner 2
Hot exhaust gas from the exhaust gas is introduced into the casing from the exhaust gas inlet 12a, and when the exhaust gas moves toward the exhaust gas exhaust port 18, the exhaust gas passes through the packed bed 17 and heats the packed bed 17 to a high temperature. And the flow direction of the exhaust gas from the jet nozzle 16
The carbon dioxide in the exhaust gas is dissolved into the water and the heat is exchanged by recovering the exhaust heat by contacting with the water jetted in the same lateral direction as.

Here, the exhaust gas inlet 12a for introducing the exhaust gas of the hot water supply burner 2 into the gas-liquid contact portion G is provided so as to be positioned higher than the exhaust gas exhaust port 18 for discharging the exhaust gas of the hot water supply burner 2, and The jet nozzle 16 uses the hot water supply burner 2 in the gas-liquid contact portion G to supply the water or hot water supplied from the path.
The exhaust means is configured to eject from the upstream side to the downstream side in the exhaust flow direction.

A temperature sensor S5 for detecting the temperature of the gas-liquid contact portion G is provided near the filling layer 17 in the casing. The temperature sensor S5 is also connected to the control unit H.

The lower part of the gas-liquid contact portion G is constructed so as to collect the water jetted from the jet nozzle 16 and the hot water supplied from the hot water supply passage W2 and guide it to the communication pipe 22. A water flow drive valve 23 is provided at a connection portion with the communication pipe 22.

The water flow drive valve 23, when water or hot water is supplied from the jet nozzle 16 and the hot water supply passage W2, is caused by the flowing water pressure of the water or hot water falling on the valve body 23a.
3a is pushed down, and the gas-liquid contact portion G moves to the water pool portion F.
In the state where the flow of the path portion leading to is opened, and the water or hot water is not supplied from the jet nozzle 16 and the hot water supply passage W2, the valve body 23 is set by the spring 23b.
It is configured such that a is pushed up and the flow in the path portion from the gas-liquid contact portion G to the water pool portion F is closed.

The above-mentioned thermistor S3 is provided in the connecting pipe 22 so as to be located on the downstream side of the water flow drive valve 23.

In the water pool F, the hot water supply passage W4 is connected to the bottom of the casing, and the water outlet 19 to the hot water supply passage W4 is provided at a position higher than the bottom of the casing. Water or hot water is stored in the casing, and the water outlet 19 is provided in the casing by the sealing plate 20 when the water or hot water is stored.
Is configured to be isolated, and thus is configured to seal the path portion from the gas-liquid contact portion G to the bathtub B in the path for supplying the carbonated hot water with water.

An overflow 21 is provided above the casing of the water pool F. Overflow 2
1 is provided at a position lower than the position where the exhaust outlet 18 is connected in the gas-liquid contact portion G.

In the portion of the tubular body forming the water outlet 19 near the bottom of the casing, the pores 2 serving as a discharging means for discharging the water or hot water stored in the water pool F
4 are provided. In the hot water supply apparatus of the present embodiment, water or hot water is supplied to the bathtub B at a rate of about 2 minutes per minute.
Configured to supply at a rate of 4 l / min,
Is a hole with a diameter of 4 mm. Therefore, when the water or hot water is supplied to the path, the water pool F forms a water-sealed state by collecting the water or hot water, but at the gas-liquid contact part G, the jet nozzle 16 and the hot water supply passage W.
Water or hot water is no longer supplied from 2, and the water flow drive valve 23
As the path is closed by, the water or hot water is gradually discharged from the pores 24, and the water or hot water is not accumulated.

The control means 101 is configured to execute the following four kinds of hot water supply modes. The first hot water supply mode is a hot water supply hot water supply mode in which only hot water from the hot water supply heat exchanger 1 is supplied to the bathtub B. The second hot water supply mode is a carbonated hot water supply mode in which hot water from the hot water heat exchanger 1 and hot water that has passed through the gas-liquid contact portion G are mixed and supplied to the bathtub B. In the third hot water supply mode, the hot water from the hot water heat exchanger 1 is supplied to the hot water tap K.
General hot water supply mode to supply only to. The fourth hot water supply mode is
It is an additional heating hot water supply mode by the additional heating unit C.

In the present embodiment, the hot water supply mode in which hot water is supplied to the bathtub B and hot water to the hot water tap K at the same time is not provided, and the hot water supply mode or the carbonated water supply mode is executed. When the hot water supply tap K is opened, the hot water supply mode or the carbonated water supply mode is stopped and the general hot water supply mode is executed.

The controller 15 is used for the hot water supply mode.
Of the hot water supply switch 15a. When the hot water supply switch 15a is operated, the hot water supply burner 2
First, the intermittent valve 13 is opened before the ignition of
Water is poured into the water pool F for a predetermined time. By the water injection for the predetermined time, the water-sealed state in the water pool F is configured. Next, the blower fan 3 is driven, the hot water supply burner 2 is ignited, and the thermistor S3 is detected based on the detection results of the thermistors S1 and S3 and the water amount sensor S2.
The fuel control valve 4 and the fuel interrupt valve 5 are controlled so that the hot water supply temperature Tx detected at 1 approaches the target hot water supply temperature Ts set by the target hot water supply temperature setting switch 15c. The rotation speed is controlled.

In the carbonated hot water supply mode, the carbonated hot water supply switch 15 is used.
It is executed by the operation of b. Carbonated water heater switch 15b
When the hot water supply burner 2 is ignited, first, the intermittent valve 13 is opened to inject water into the water pool F for a predetermined time, and at the same time, the temperature of the gas-liquid contact part G is measured by the temperature sensor S5. Is checked, and when the temperature is higher than the predetermined temperature, the gas-liquid contact portion G is cooled by driving the blower fan 3. When water is suddenly ejected from the ejection nozzle 16 in a state where the gas-liquid contact portion G is overheated to a predetermined temperature or more, an abnormal sound such as a shatter is generated, the water is violently evaporated, and a large amount of water is exhausted from the exhaust port 18 or the like. This is because water vapor is discharged, which is not preferable for using the water heater. Next, after the elapse of a predetermined time, if the gas-liquid contact portion G is below a predetermined temperature, the intermittent valves 13 and 14 are opened, the hot water supply burner 2 is ignited,
Fuel adjustment so that the hot water supply temperature Tx detected by the thermistor S3 approaches the target hot water supply temperature Ts set by the target hot water supply temperature setting switch 15c based on the detection results of the thermistors S1, S3 and the water amount sensor S2. Valve 4
Also, the fuel interrupt valve 5 is controlled, and the rotation speed of the blower fan 3 is controlled following the control.

The general hot water supply mode is executed as the hot water supply tap K is opened. When the hot water tap K is opened, the intermittent valve 13 and the intermittent valve 14 are closed, and the temperature of hot water supplied to the hot water tap K is set to a predetermined hot water temperature based on the detection results of the thermistor S1 and the water amount sensor S2. So that
The fuel control valve 4 and the fuel interrupting valve 5 are controlled, and the rotation speed of the blower fan 3 is controlled accordingly.

In the additional heating hot water supply mode, the additional heating hot water switch 15 is used.
It is executed with the operation of d. Additional heating hot water switch 15d
Is operated, the circulating pump 9 is operated, the blower fan 8 is driven, the reburning burner 7 is ignited, and reburning hot water is supplied. In addition, the combustion amount of the reburning burner 7 is controlled to a constant strength with relatively high thermal power.

Further, the control means 101 constantly monitors the temperature detected by the thermistor S3, and when water or hot water is not supplied to the path, that is, the hot water supply mode and the carbonated water supply mode are executed. When not,
When the thermistor S3 detects a temperature equal to or higher than a predetermined temperature, combustion of the hot water supply burner 2 is stopped.

That is, when the hot water supply mode and the carbonated water supply mode are not executed, normally, the water flow drive valve 23 should be closed, so that the flow path from the gas-liquid contact portion G to the bath B is circulated. Should be closed, but when a temperature higher than a predetermined temperature is detected by the thermistor S3, for example, the water flow drive valve 23 fails and the path portion from the gas-liquid contact portion G to the bath B is reached. Since the exhaust gas of the hot water supply burner 2 may flow to the path part leading to the bathtub B, the combustion of the hot water supply burner 2 is stopped,
The exhaust gas is prevented from flowing into the bathtub B.

[Other Embodiments] The exhaust passage portion 25 provided in the gas-liquid contact portion G is not limited to the shape that allows the exhaust gas of the hot water supply burner 2 to flow in the lateral direction, but may have a shape that allows the exhaust gas to flow in the inclined direction.

Incidentally, reference numerals are provided in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing the overall configuration of a water heater.

FIG. 2 is a sectional view showing a gas-liquid contact portion.

FIG. 3 is a sectional view showing a conventional gas-liquid contact portion.

[Explanation of symbols]

 B Supply target part G Gas-liquid contact part 2 Hot water supply burner 12a Exhaust gas inlet 16 Spouting means 18 Exhaust gas outlet 25 Exhaust path part

Claims (1)

(57) [Claims] 1. A gas-liquid contact portion (G) for contacting water or hot water with the exhaust gas of the hot water supply burner (2) is provided in the middle of a path for supplying water or hot water to the supplied portion (B). A hot water supply device, wherein the gas-liquid contact part (G) is exhausted from the hot water supply burner (2).
Of the exhaust path (2
5) is provided, and the exhaust path portion (25) is provided with the path.
The water or hot water supplied from
Is provided with a jetting means (16) for jetting toward the downstream side.
Contact with water or hot water spouted from the spouting means (16).
The exhaust outlet (18) for discharging the exhausted gas that has been touched is
A water heater provided below the air path portion (25) .