JPH0457937B2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention separates a hot water storage tank and a heat source, and uses a circulation pump to blow out high-temperature hot water obtained from an instantaneous heat source from the top of the hot water storage tank. The present invention relates to a hot water boiler that is becoming stratified, and relates to a multi-type hot water boiler structure in which a plurality of hot water storage tanks are arranged in a row.

Conventional configuration and its problems A conventional hot water boiler is configured as shown in FIG. That is, a heating circuit is constructed by a hot water storage tank 3 having a hot water outlet pipe 1 at the top and a water supply pipe 2 at the bottom, and a circulation pump 4, a check valve 10, a heat source part 5, and a hot water supply pipe 8 in this order from the bottom of the hot water storage tank 3. , the tip of the hot water supply pipe 8 is connected to the substantially upper part of the hot water storage tank 3. The on/off operation is performed by a thermistor 9 provided at the lower part of the hot water storage tank 3.

This structure uses a temperature stratification method in which hot water obtained in the heat source section 5 is stored from approximately the upper part of the hot water storage tank 3, so when boiling the water in the hot water storage tank 3 to high temperature hot water, Unless the conditions for ejecting hot water from the pipe 8 to the hot water storage tank 3 are modified considerably, there is a drawback that the temperature distribution in the upper and lower parts of the hot water storage tank 3 becomes uneven. For example, when the circulation flow rate is high, diffusion becomes intense within the hot water storage tank 3,
becomes more uneven. The performance in this case is shown in FIG.

Furthermore, in winter when the outside temperature is low, when boiling hot water and discharging it after several hours, there is a drawback that the temperature of the hot water drops rapidly. (An example of this performance is shown in Fig. 3.) This is because the check valve 10 is provided in the heating circuit after boiling, so that the temperature of the water in the heating circuit decreases moment by moment depending on the outside temperature. Because the water temperature will eventually reach the water temperature level, and because an instantaneous water heater is used for the heat source 5,
Low-temperature water (below the set water temperature) until a steady state after heating starts
is sent. (Figure 4 shows the start-up performance of a common instantaneous water heater.)

Also, it depends on the use of the hot water boiler (for example, commercial use).
However, if the heating circuit malfunctions, it may cause great inconvenience and disadvantages such as damage.

Next, in this type of hot water boiler, depending on the usage (for example, commercial use), it is desired to increase the hot water output capacity. At this time, a single hot water boiler is
Although there are means for accommodating unit and 3-unit arrangement, they have the drawback of being expensive. Furthermore, although there is a method for increasing the capacity of the hot water storage tank to an extremely large extent, there are disadvantages in transportation due to the extremely large installation space and large external dimensions.

Separately from the above, in the case of the upper stratification method for hot water, during the process of boiling up to a steady state, a thermistor etc. is installed at the outlet of the heat source to keep the temperature of the water sent from the hot water supply pipe constant. Another disadvantage is that unless the circulation rate is controlled, it is basically impossible to equalize the temperature in the upper and lower parts of the hot water storage tank.

Purpose of the Invention The present invention is intended to eliminate such conventional drawbacks.The first purpose is to reduce the distribution of hot water temperature during boiling, and the second purpose is to prevent a sudden drop in the hot water temperature. The third purpose is to prevent a complete stoppage of operation even if a failure occurs in the heating circuit, and the fourth purpose is to prevent installation space, external dimensions, and price from a large capacity hot water supply capacity. Our aim is to provide excellent hot water at

Composition of the Invention In order to achieve this object, the present invention connects a hot water supply pipe connecting port, in which a hot water outlet pipe is inserted and fixed inside a hot water supply pipe inside, to a water inlet pipe from the other lower part of a hot water storage tank having a water supply pipe below. branch out, each with a circulation pump,
A plurality of flow channels each having a flow rate regulating valve, a water pressure responsive section, an instantaneous heat source section, and a thermistor are provided, and the plurality of flow channels are assembled into a single hot water pipe and connected to the hot water pipe connection port. A hot water storage tank in which a hot water storage tank with the same configuration as the above hot water storage tank is installed separately, and the hot water outlet pipe, water supply pipe, hot water supply pipe, and water inlet pipe provided in the separate hot water storage tank are connected to the hot water storage tank. This is a multi-type configuration.

With this configuration, the circulation flow rate is extremely reduced by the flow rate attenuator, the hot water is spouted horizontally uniformly into the storage tank, and the heat source section is linked with a thermistor to proportionally control the temperature at the upper part of the high-temperature hot water. Stratification is established and temperature distribution can be minimized. In addition, the flow rate adjustment valve is not completely non-returning (closed), but has a small flow hole, so when the hot water is stopped, a small amount of high-temperature water flows backward in the heating circuit, which maintains the temperature of the hot water in the heating circuit. Removes sudden downs. In addition, by using a plurality of heating circuits and using flow rate adjustment valves to make the circulation volume the same in each, it is possible to prevent a complete stoppage of operation in the event of a failure in the heating circuit.

Furthermore, high-temperature hot water can be stratified on top of a separate hot water storage tank in the same way as described above, making it possible to cope with cases where the hot water output capacity is large.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 5 to 9.
This will be explained based on the drawings. In the figures, parts that are the same as those in FIG. 1, which is a conventional example, are given the same numbers.

In FIG. 5, the hot water storage tank 3 has a hot water outlet pipe 1 at the top,
Branched into 6a and 6b via the water inlet pipe 6 at the bottom,
Circulation pumps 4a, 4b and flow rate adjustment valve 11, respectively
a, 11b, water pressure responsive parts 23a, 23b, heat source parts 5a, 5b, thermistors 16a, 16b, branch pipes 8a, 8b of hot water supply pipe 8, and hot water supply pipe 8, which are arranged in this order to form a heating circuit.

The flow rate adjustment valves 11a and 11b have a float part 18 having a small flow hole 17 at the center of the internal passage, and a threaded part 20 in a direction orthogonal to the passage. is inserted, and 19 is a presser metal fitting.

The hydraulic response parts 23a and 23b are composed of a float part and a switch part (not shown).

In addition, a flow velocity attenuator 1 is provided inside the upper part of the hot water storage tank 3.
2 is inserted and fixed thereinto, and is connected to the hot water supply pipe 8.

The flow rate attenuator 12 includes a cup-shaped rectifier plate 1 having the same cylindrical shape as the dispersion ejection plate 13 having a plurality of small holes 13a.
4 are spaced apart from each other and are fixed opposite each other with a stopper 15 such as an E-ring, and the rectifying plate 14 is set at a position facing into the hot water storage tank 3. In addition to the above basic configuration, a hot water storage tank 3' is provided separately from the hot water storage tank 3. The configuration of the hot water storage tank 3' is similar to the hot water storage tank 3 described above.

In other words, there is a hot water tap 1' at the top and a flow velocity damping body 1.
A water supply pipe connection port 22' with a water supply pipe 2' provided inside is provided, and a water supply pipe 2' and a water inlet pipe 6' are provided at the lower part. Then, the hot water outlet pipe 1' is connected to the hot water outlet pipe 1 of the hot water storage tank 3, the hot water supply pipe connection port 22' is connected to the hot water supply pipe 8 of the hot water storage tank 3,
The water supply pipe 2' is connected to the water supply pipe 2 of the hot water storage tank 3, and the water inlet pipe 6' is connected to the water inlet pipe 6 of the hot water storage tank 3, respectively.

Further, 11c is a flow rate regulating valve provided in the hot water supply pipe 8 of the hot water storage tank 3, and 24 is a main body case in which the heating circuit and the hot water storage tank 3 are housed. Reference numeral 25 is a main body case housing a separate hot water storage tank 3'.

Next, in the above configuration, the operation will be explained separately during boiling and dispensing.

(1) During boiling If the water temperature in the hot water storage tank 3 is lower than the set temperature, the temperature thermistor 9 detects this and the circulation pumps 4a, 4b are activated.
Sends a signal to drive. When the circulation pumps 4a, 4b are driven, the flow switches provided in the hydraulic response parts 23a, 23b are activated to send a signal to the heat sources 5a, 5b to start ignition and combustion, and the water is circulated and heated. The high-temperature hot water obtained in the heat sources 5a and 5b is sent from the hot water pipe 8 to the hot water pipe connection ports 8 and 8' of the hot water storage tank 3 and the hot water storage tank 3', respectively, and is sent to the upper part of the hot water storage tank 3 and 3'. More temperature stratification. After that,
The water temperature at the bottom of the hot water storage tank 3 rises to the set water temperature (high-temperature hot water falls from the top to the bottom of the hot water storage tank).
The temperature thermistor 9 senses this and the circulation pump 4
Stop a and 4b. When the circulation pumps 4a, 4b stop, the float switches of the hydraulic response units 23a, 23b detect this, and the heat sources 5a, 5b extinguish the fire.

In this boiling process, the one of the present invention
The flow rate of the circulation pumps 4a, 4b is kept constant, and the combustion amount of the heat sources 5a, 5b is proportionally controlled to keep the temperature of the hot water sent to the hot water supply pipe 8 constant. In other words, it is a method in which high-temperature hot water is stratified toward the lower part of the hot water storage tank 3, and a large amount of hot water can be supplied by making the entire hot water storage tank 3 a high-temperature layer as much as possible. Therefore, in this case, when the water is about to boil (the state in which the high-temperature water has stratified to the bottom of the water storage tank), there is some temperature boundary layer, so the temperature of the water flowing in from the inlet pipe is not the water temperature, but the temperature has increased slightly. Since the temperature of the hot water fed into the hot water supply pipe 8 becomes hot water or higher than the set temperature, the thermistors 16a and 16b provided at the outlets of the heat sources 5a and 5b detect this, and a proportional valve (not shown) that adjusts the amount of combustion is activated. ) to reduce the amount of combustion (TDR combustion) so that the hot water temperature can always be maintained at the set temperature.
The basic conditions for equalizing the temperature of the hot water in the hot water storage tanks 3 and 3' are established.

Next, the tips of the hot water supply pipes 8 and 8' are connected to small holes 13a provided in the dispersion and jetting plates 13 of the flow velocity attenuators 12 and 12' at the upper part of the hot water storage tanks 3 and 3' to equalize jetting conditions. A cylindrical cup-shaped rectifying plate 1 is installed to minimize the flow velocity at a position facing into the hot water storage tanks 3 and 3'.
In step 4, the flow in the vertical direction to the hot water storage tank is ejected almost uniformly in the horizontal direction at a low flow velocity.
It is possible to prevent diffusion within the hot water storage tanks 3 and 3', thereby establishing temperature stratification in the upper part of the hot water, and minimizing temperature distribution in the upper and lower parts of the hot water storage tanks 3 and 3'. The performance at this time is shown in FIG. At this time, the flow rate adjustment valve 11
The adjustment settings are made in c.

(2) When dispensing hot water After boiling the hot water in the hot water storage tanks 3 and 3' to a predetermined temperature (for example, 80°C), a faucet (not shown) at the tip of the dispensing pipe 1 is developed to dispense hot water. Low-temperature water is sent from the water supply pipe 2, and high-temperature water at a predetermined temperature is combined and sent out in large quantities from the respective hot water storage tanks from the hot water supply pipe 1 in the upper part by pushing up. and,
If hot water is continuously dispensed, the amount of water supplied will eventually increase to near the temperature thermistor 9 provided on the side wall of the hot water storage tank 3, and the temperature of the supplied water will be detected and a signal sent to the circulation pumps 4a, 4b to drive them. At the same time, the water pressure responsive parts 23a and 23b detect the water in the same way as during boiling, and the heat sources 5a and 5b start ignition and combustion (reheating).

The hot water dispensing process is as described above, but after boiling, efforts are being made to avoid the drop in hot water temperature in the heating circuit as much as possible during winter when the outside temperature is extremely low.

In other words, when the heat sources 5a, 5b and the circulation pumps 4a, 4b are stopped after boiling, the flow regulating valves 11a, 11b provided in the heating circuit do not have a complete check (closing) function, but the small flow holes 17 Due to this small flow hole 17, when the temperature of the water in the heating circuit decreases after boiling due to the influence of the outside temperature, the specific weight increases, and the water supply pipes 8, 8'
By consciously creating a slight reverse convection from the water inlet pipes 6 and 6', the temperature of the hot water in the heating circuit does not drop significantly (in contrast to the water temperature in the conventional case), so reheating is possible. It is possible to minimize the sudden drop in the hot water temperature caused by the mixing of low temperature water during transient periods in the heat sources 5a and 5b. The performance at this time is shown in FIG. At this time, if the reverse convection flow rate is increased, the sudden drop in the hot water temperature can be solved, but the amount of heat dissipated will increase and hot water will enter the lower part of the hot water storage tank 3. The temperature distribution becomes even larger.

Therefore, the reverse convection flow rate is set based on the balance between the two.

(3) In the event of a failure In order to avoid a complete stop of the function in the event of a failure in the heating circuit, there are multiple heating circuits, and the flow rate adjustment valve 11 is installed to eliminate variations in the circulation amount.
A plurality of heating circuits are established by adjustment using adjustment screw portions 21 provided at a and 11b. Therefore, in the unlikely event that one of the heating circuits fails, the remaining heating circuit can perform half the function, and complete stoppage of the function can be avoided.

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

(1) During boiling, by proportionally controlling the combustion amount in a steady state, a constant hot water temperature is sent to the flow rate attenuator, and by lowering the flow rate, convection in the hot water storage tank is prevented, resulting in temperature distribution during boiling. Since the upper stratification of high-temperature hot water with very little amount of water is possible, it is possible to obtain high-temperature hot water in a short time (it is possible to obtain high-temperature water quickly), and the usability can be improved.

(2) The flow velocity attenuator is composed of a dispersion jet plate and a rectifying plate, and the rectifying plate faces into the hot water storage tank. Moreover, the purpose can be achieved by inserting and fixing it into the hot water pipe connection port. It is cheaper than methods using sintered metal, wire mesh, etc.

(3) By causing a small amount of high-temperature water to reverse convection in the heating circuit when the operation is stopped after boiling, the amount of heat dissipated is reduced, and the temperature of the hot water is stabilized without increasing the temperature distribution in the lower part of the hot water storage tank. can be achieved.

(4) Since the heating circuits are arranged in parallel, even in the event of a failure, complete stoppage of the function can be avoided, which is an advantage during maintenance. By using multiple units, it can be used for everything from home use to commercial use.

(5) It is possible to provide a hot water boiler with high thermal energy efficiency, which has a large amount of hot water with a stable temperature (hot water storage function) and a high-temperature hot water upper stratification system that quickly draws hot water (instantaneous function).

(6) By using multiple types of hot water storage tanks, the cost is low, the external dimensions (height) are not large, and the hot water supply capacity is large enough to allow the freedom to install a separate hot water storage tank. Boiler can be provided.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional hot water boiler, Figure 2 is a boiling performance diagram, Figure 3 is a hot water temperature performance diagram,
Fig. 4 is a typical start-up performance diagram for an instantaneous water heater, Fig. 5 is a configuration diagram of a hot water boiler according to an embodiment of the present invention, Fig. 6 is an enlarged sectional view of the same flow velocity damping body, and Fig. 7
The figure is an enlarged sectional view of the flow rate regulating valve, FIG. 8 is a boiling performance diagram, and FIG. 9 is a hot water temperature performance diagram. 3... Hot water storage tank, 3'... Separate hot water storage tank, 4a,
4b...Circulation pump, 5a, 5b...Heat source section, 8
... Hot water pipe, 11a, 11b, 11c ... Flow rate adjustment valve, 12 ... Flow rate damping body, 13 ... Dispersion jet plate, 14 ... Rectifier plate, 16a, 16b ... Thermistor, 17 ... Small flow hole, 18...Float part,
22... Hot water pipe connection port, 23a, 23b... Water pressure response part.

Claims (1)

[Claims] 1. A hot water supply pipe connection port with a hot water outlet pipe and a flow rate attenuator inserted and fixed inside the upper part, and a water inlet pipe branched from the lower part of the hot water storage tank with a water supply pipe at the lower part, respectively.
A plurality of flow paths including a circulation pump, a flow rate adjustment valve, a water pressure response section, an instantaneous heat source section, and a thermistor are provided, and these multiple flow paths are integrated into a single hot water supply pipe and connected to the hot water supply pipe connection port. A hot water boiler in which a hot water storage tank having the same configuration as the hot water storage tank is provided separately, and hot water outlet pipes, water supply pipes, hot water supply pipes, and water inlet pipes provided in the separate hot water storage tank are connected to each of the hot water storage tanks.