JPH0670523B2 - Hot water boiler - Google Patents

Description

TECHNICAL FIELD The present invention separates a hot water storage tank from a heat source, and the hot water obtained in an instantaneous heat source section is jetted from the upper part of the hot water storage tank by a circulation pump to produce high temperature hot water. The present invention relates to a hot water boiler that is being stratified, and relates to a hot water boiler structure having a flow rate adjusting valve and a flow velocity attenuator in a heating circuit.

Configuration of Conventional Example and Problems Thereof A conventional hot water boiler is configured as shown in FIG. That is, a hot water storage tank 3 having a hot water outlet pipe 1 at the upper part and a water supply pipe 2 at the lower part, a circulation pump 4, a check valve 10, a heat source part 5, and a hot water supply pipe 8 are arranged in this order from the lower part of the hot water storage tank 3. ,
This is a structure in which the tip of the hot water supply pipe 8 is connected to substantially the upper part of the hot water storage tank 3. Then, the thermistor 9 provided below the hot water storage tank 3 is turned on and off.

In this structure, since the high-temperature hot water obtained in the heat source unit 5 is stored from approximately the upper part of the hot-water storage tank 3, the temperature stratification method is used. If the conditions for jetting from the pipe 8 to the hot water storage tank 3 are not devised considerably, there is a drawback that the temperature distribution in the upper and lower parts of the hot water storage tank 3 becomes non-uniform.
For example, when the flow rate of the circulation flow rate is large, the diffusion in the hot water storage tank 3 becomes severe and the flow rate becomes more uneven. The performance in this case is shown in FIG.

Apart from the above, in the case of the upper stratification method of hot water,
In the process of boiling to a steady state, a thermistor is installed at the outlet of the heat source to keep the temperature of the hot water sent from the hot water supply pipe constant, and basically the upper and lower parts of the hot water tank must be controlled unless the circulation amount is controlled. The drawback is that the temperature cannot be made uniform.

OBJECT OF THE INVENTION The present invention eliminates such conventional defects, and an object of the present invention is to improve hot water supply characteristics during boiling.

In order to achieve this object, the present invention stores hot water at a set temperature and pushes up the hot water by supplying water from the lower part, and sucks the stored water with a circulation pump from the lower part of the hot water storage tank that discharges from the upper part, and adjusts the flow rate. A valve regulates the amount of suction, a temperature sensor detects the temperature of the heated water, and the instantaneous heat source section circulates and supplies the hot water controlled to the preset temperature to the hot water supply pipe connection port at the top of the adjustment tank, and the supply pipe connection port A flow-rate attenuator, in which a dispersion jet plate having a plurality of small holes and a cup-shaped rectifying body are fixed to face each other with a distance, is inserted and fixed inside.

With this configuration, the circulation flow velocity is extremely reduced by the flow velocity attenuator, and the water is uniformly jetted horizontally into the hot water storage tank, and
By controlling the heat source part in proportion to the thermistor, the upper temperature stratification of the hot water is established and the temperature distribution can be extremely reduced.

Description of Embodiments One embodiment of the present invention will be described below with reference to FIGS. 5 to 9. In the figure, the first example of the conventional example
The same parts as those in the figure are denoted by the same reference numerals.

In FIG. 5, the hot water storage tank 3 is branched into 6a and 6b via the hot water outlet pipe 1 at the upper part and the water inlet pipe 6 at the lower part, and the circulation pump 4 is provided.
a, 4b, flow rate adjusting valves 11a, 11b, water pressure responding parts 23a, 23b, heat source part
5a, 5b, thermistors 16a, 16b, branch pipes 8a, 8b of the hot water supply pipe 8,
The hot water supply pipes 8 are arranged in this order to form a heating circuit.

The flow rate adjusting valves 11a and 11b have a float portion 18 having a small flow rate hole 17 in the center of the passage portion inside, and a screw portion 20 in a direction orthogonal to the passage portion. The screw portion 20 has an adjusting screw portion 21.
Is inserted, and 19 is a holding metal fitting.

When the water temperature rises to the set hot water temperature (high-temperature hot water drops downward from the upper part of the hot water storage tank), the temperature thermistor 9 senses and stops the circulation pumps 4a and 4b. When the circulation pumps 4a, 4b stop, the flow switches of the water pressure responding parts 23a, 23b detect and the heat source parts 5a, 5b extinguish.

In the boiling process, according to the present invention, the flow rates of the circulation pumps 4a and 4b are constant, the combustion amounts of the heat source portions 5a and 5b are proportionally controlled, and the hot water temperature sent to the hot water supply pipe 8 is constant. That is, this is a method in which hot water is stratified toward the lower part of the hot water storage tank 3, and a large amount of hot water can be obtained by making the entire hot water storage tank 3 as a high temperature layer as much as possible. Therefore, in this case, there is a temperature boundary layer to some extent when it is about to boil (a state where hot water has stratified to the bottom of the hot water storage tank),
Since the temperature of the water flowing in from the inlet pipe is not the water temperature but hot water whose temperature has risen a little, the temperature of the hot water sent to the hot water supply pipe 8 becomes equal to or higher than the set temperature. When the detected water temperature of 16b rises to the set hot water temperature (high-temperature hot water drops downward from the upper part of the hot water storage tank), the temperature thermistor 9 senses and stops the circulation pumps 4a and 4b. When the circulation pumps 4a, 4b stop, the flow switches of the water pressure responding parts 23a, 23b detect and the heat source parts 5a, 5b extinguish.

In the boiling process, according to the present invention, the flow rates of the circulation pumps 4a and 4b are constant, the combustion amounts of the heat source portions 5a and 5b are proportionally controlled, and the hot water temperature sent to the hot water supply pipe 8 is constant. That is, this is a method in which hot water is stratified toward the lower part of the hot water storage tank 3, and a large amount of hot water can be obtained by making the entire hot water storage tank 3 as a high temperature layer as much as possible. Therefore, in this case, there is a temperature boundary layer to some extent when it is about to boil (a state where hot water has stratified to the bottom of the hot water storage tank),
Since the temperature of the water flowing in from the inlet pipe is not the water temperature but hot water whose temperature has risen a little, the temperature of the hot water sent to the hot water supply pipe 8 becomes equal to or higher than the set temperature. 16b detects and sends a signal to a proportional valve (not shown) that adjusts the combustion amount to reduce the combustion amount (TDR combustion),
The set hot water temperature can always be set, and the basic condition for achieving uniform hot water temperature in the hot water storage tank 3 is satisfied.

Next, the tip of the hot water supply pipe 8 is connected to the flow velocity attenuator 12 above the hot water storage tank 3.
In addition to uniformizing the ejection conditions with the small holes 13a provided in the dispersion ejection plate 13, the flow velocity is extremely reduced at the position facing the hot water storage tank 3, and the hot water storage tank is provided with the cylindrical cup-shaped straightening plate 14. On the other hand, by vertically and almost uniformly ejecting the flow in the horizontal direction at a low flow velocity, diffusion in the hot water storage tank 3 can be prevented, and the upper temperature stratification of the hot water is established. The temperature distribution of can be extremely reduced. The performance at this time is shown in FIG.

2 When tapping hot water After boiling the hot water in the hot water storage tank 3 to a predetermined temperature (for example, 80 ° C), tap the tap (not shown) at the tip of the hot water tap pipe 1 to tap hot water. Low-temperature water is sent in, and hot water of a predetermined temperature is sent out from the upper tap pipe 1 by the push-up method.

Then, if hot water is continuously discharged, when the amount of water supply increases until near the temperature thermistor 9 provided on the side wall of the hot water storage tank 3, the temperature of the water supply is detected and a signal is sent to the circulation pumps 4a, 4b to drive it. The water pressure responding part
23a, 23b detect and heat source parts 5a, 5b ignite to burn (fire)
Will be started.

The process of tapping is as described above, but after boiling,
In winter, it encourages efforts to prevent the temperature of the hot water in the heating circuit from dropping when the outside temperature is extremely low.

That is, at the time of stopping the heat source units 5a, 5b and the circulation pumps 4a, 4b after boiling, the flow rate adjusting valves 11a, 11 provided in the heating circuit are provided.
b does not have a complete check (close) function, but a small flow rate hole 17 is provided, and this small flow rate hole 17 causes the temperature of the hot water in the heating circuit to drop from after boiling due to the influence of the outside air temperature. When it comes, the specific weight becomes large, and a slight convection is intentionally performed from the hot water supply pipe toward the water inlet pipe 6, whereby the hot water temperature in the heating circuit is drastically reduced (it becomes the water temperature in the conventional example). ) Does not occur, it is possible to minimize the sudden drop in the hot water temperature due to the mixture of low temperature water during the transition of the heat source units 5a and 5b during reheating. The performance at this time is shown in FIG. At this time, if the reverse flow rate is increased, the sudden decrease in the hot water temperature can be solved, but on the contrary, the heat radiation amount becomes large and hot water is mixed in the lower part of the hot water storage tank 3. become,
The temperature distribution is even larger.

Therefore, the anti-counterflow rate is set depending on the balance between the two.

3 In case of failure In order to prevent the complete stop of the function in the case of a failure in the heating circuit, there are multiple heating circuits and the adjustment screws provided on the flow rate adjusting valves 11a, 11b to eliminate the fluctuation of the circulation amount. A plurality of heating circuits are established by adjusting the part 21. Therefore, in the unlikely event that one of the heating circuits fails, the remaining heating circuits can perform 1/2 the function, and the complete stop of the function is avoided.

Effects of the Invention According to the hot water boiler of the present invention, the following effects are obtained.

1. The flow velocity attenuator can uniformly supply the hot water fed from the hot water supply pipe to the hot water storage tank from the hot water supply connection port by the dispersion jet plate having a plurality of small holes and the cup-shaped straightening member without uneven flow. As a result, it is possible to prevent the water and the hot water from being agitated in the upper part of the hot water storage tank due to the uniform jetting of the spray without uneven flow in the circumferential direction (horizontal direction) inside the hot water storage tank, the better attenuation of the flow velocity. . As a result, in order to obtain the same effect, it is cheaper than a method of preventing uneven flow by using a sintered metal, a wire net, or the like.

2.During boiling, a constant hot water temperature is sent to the flow velocity attenuator by proportionally controlling the combustion amount in a steady state,
By lowering the flow velocity, convection in the hot water storage tank can be prevented and the upper stratification of high temperature hot water with extremely small temperature distribution during boiling can be obtained, so high temperature hot water can be obtained in a short time (high temperature hot water can be taken early). It is possible to improve usability.

3. When the operation is stopped after boiling, a small amount of high-temperature hot water is reversely convected in the heating circuit to reduce the amount of heat radiation and to stabilize the hot water temperature without increasing the temperature distribution in the lower part of the hot water storage tank. Can be achieved.

4.Since the heating circuits are in parallel, there is a feature during maintenance that the function can be completely stopped even if a failure should occur. By using multiple units, it will be possible to support from home use to business use.

5. It is possible to provide a hot water boiler with a high thermal energy efficiency, which has a large amount of hot water with a stable hot water discharge (a hot water storage type function) and quick take-up of the high temperature hot water by the upper stratification method (a momentary function).

[Brief description of drawings]

Fig. 1 is a configuration diagram of a conventional hot water boiler, Fig. 2 is the same boiling performance diagram, Fig. 3 is the same hot water temperature performance diagram, and Fig. 4 is a general start-up performance diagram for an instantaneous water heater. FIG. 5 is a configuration diagram of a hot water boiler which is an embodiment of the present invention, FIG. 6 is an enlarged sectional view of the same flow velocity attenuator, FIG. 7 is an enlarged sectional view of the same flow rate adjusting valve, and FIG. 8 is the same. Fig. 9 is a boiling performance diagram, and Fig. 9 is a performance diagram of the boiling water temperature. 3 ... Hot water storage tank, 4a, 4b ... Circulation pump, 5a, 5b ... Heat source part, 8 ... Hot water supply pipe, 11a, 11b ... Flow control valve, 12 ... Flow velocity damping body, 13 ... Dispersing jet plate , 14 …… Rectifier, 16a, 16b
…… Thermistor, 17 …… Small hole, 18 …… Float part,
22 …… Hot water supply pipe connection port, 23a, 23b …… Water pressure response part.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Goro Mizuta 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Koichi Kanazaki 1006, Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 56) Bibliography S. 57-2354 (JP, U) S. 48-19163 (JP, Y1)

Claims (1)

[Claims] 1. A hot water of a set temperature is stored and the hot water is pushed up by supplying water from the lower part, the stored water is sucked from the lower part of a hot water storage tank which is discharged from the upper part by a circulation pump, and the suction amount is adjusted by a flow rate adjusting valve to adjust the temperature. The hot water temperature is detected by a sensor, and the hot water whose temperature is controlled by the instantaneous heat source is circulated and supplied to the hot water supply pipe connection port at the upper part of the hot water storage tank, and there are a plurality of small holes inside the hot water supply connection port. A hot water boiler in which a flow velocity attenuator in which a dispersion jet plate and a cup-shaped rectifier are fixed to face each other is inserted and fixed.