JPS59185939A - Water boiler - Google Patents

Abstract

PURPOSE:To reduce the water temperature distribution at the time of completion of boiling and to prevent a sudden drop in temperature of the delivered hot water in a multi type water boiler which has multiple hot water reservoirs of the thermal layer type. CONSTITUTION:In a multi type water boiler in which water inlet pipe 6 is branched from a lower part of a hot water reservoir 3 which is respectively provided with a circulation pump 4a, 4b, a flow rate regulating valve 11a, 11b, a water pressure-responsive unit 23a, 23b, an instant type heat source 5a, 5b and a thermistor 16a, 16b to form multiple passages, and such passages are combined into one single hot water feed pipe 8 to be connected to a coupler 22 of the hot water feed pipe, and a reservoir 3' having the same construction as said reservoir 3 is separately installed whose hot water delivery pipe 1', water feed pipe 2', hot water feed pipe 8' and water inlet pipe 6' are respectively connected to the afore-said reservoir 3, an upper thermal layer of high- temperature hot water is formed with the temperature distribution as minimal as possible by reducing the circulation velocity as much as possible by flow velocity damper 12, 12', spouting into the hot water reservoir evenly in a horizontal direction and by proportionately controlling the heat source with the interlocked thermistor. Since there are multiple heating circuits, a complete shut down of the operation can be avoided at the time of a heating circuit failure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 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 section from the top of the hot water storage tank to generate high-temperature hot water. The present invention relates to a hot water boiler in which hot water is 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 problems thereof A conventional hot water boiler is configured as shown in FIG. That is, there is a hot water storage tank 3 having a hot water outlet pipe 1 in the upper part and a water supply pipe 2 in the lower part, and a circulation pump 4. Check valve 10. Heat source part 6. The hot water supply pipe 8 constitutes a heating circuit in this order, and the tip of the hot water supply pipe 8 is connected to the upper surface of the hot water storage tank 3. Then, the thermistor 9 installed at the bottom of the hot water tank 3 turns on.

This is for off-duty operation.

This structure uses a temperature stratification method in which hot water obtained from the heat source section 6 is stored from the street 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 carefully adjusted, 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 circulating flow rate is high, diffusion becomes more intense within the hot water storage tank 3, making it more non-uniform. 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 Figure 3.) This is because the temperature of the water in the heating circuit drops from moment to moment depending on the outside temperature due to the provision of a reverse check valve 1o in the heating circuit after boiling. Because the water temperature will eventually reach the water temperature level, and because an instantaneous water heater is used on the heat source,
This is because low-temperature water (lower than the set hot water temperature) is fed until the steady state is reached after the start of heating (Figure 4 shows the start-up performance of a typical instantaneous water heater).

Depending on how the hot water boiler is used (for example, commercial use), malfunction of the heating circuit may cause many disadvantages that can lead to great inconvenience and 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. In this case, there is a method of arranging two or three units of a single hot water boiler, but this method has the disadvantage 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.

Apart from the above, in the case of the upper stratification method for hot water,
In the process of boiling to a steady state, if a thermistor or the like is installed at the outlet of the heat source and the heat source and circulation rate are not controlled to keep the temperature of the hot water sent from the hot water supply pipe constant, the upper and lower parts of the hot water storage tank will basically be damaged. This has the disadvantage that temperature cannot be made uniform.

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 at the time of boiling, and the second purpose is to prevent the temperature of hot water from dropping rapidly. 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. The purpose of this project is to provide excellent hot water boilers.

Structure 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. and a circulation pump for each branch.

A plurality of flow paths each having a flow rate adjustment valve, a water pressure responsive part, an instantaneous heat source part, and a thermistor are provided, and these plurality of flow paths 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-mentioned hot water storage tank is installed 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 the hot water storage tank. This is a multi-type configuration.

With this configuration, the circulating flow velocity is extremely reduced by the flow velocity attenuator, the hot water is uniformly spouted into the storage tank in the horizontal direction, and
By proportionally controlling the heat source in conjunction with the servo star, upper temperature stratification of high-temperature hot water is established and temperature distribution can be minimized. In addition, the flow rate adjustment valve is not completely reversed (closed), but has a small flow hole, so that when the hot water is stopped, high-temperature water flows slightly in the heating circuit in reverse convection, which maintains the temperature of the hot water in the heating circuit. The sudden down is removed. Unfortunately, by having multiple heating circuits and using flow rate adjustment valves to make the circulation volume the same for each, we are able to prevent a complete shutdown in the event of a heating circuit failure.

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 handle cases where the hot water supply capacity is large.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 5 to 9. In addition, in the figure, the first
Parts that are the same as those in the diagram are numbered the same.

In FIG. 5, the hot water storage tank 3 has a hot water outlet pipe 1° at the upper part and an inlet pipe 6 at the lower part, 6a, 6. b, each having a circulation pump 4a, 4b and a flow rate adjustment valve 11a.

11b, hydraulic response parts 23a, 23b, heat source part 5
a.

sb, thermistor 1ea, 1eb, branch pipe B of hot water supply pipe 8
A, 8b, and hot water supply pipe 8 are arranged in this order to form a Calothermal circuit.

The flow regulating valves 11a and 11b have a float portion 18 having a small flow hole 17 in the center of the internal passage, and
A threaded portion 20 is provided in a direction perpendicular to the passage portion, and this threaded portion 20
An adjustment screw portion 21 is inserted into the holder, and 19 is a holding fitting.

The water pressure responsive parts 23a and 23b are composed of a float part and a switch part (not shown).

Further, a hot water supply pipe connection port 22 into which a flow rate attenuator 12 is inserted and fixed is provided in the upper part of the hot water storage tank 3, and is connected to the hot water supply pipe 8.

The flow velocity attenuator 12 is constructed by fixing a dispersion jet plate 13 having a plurality of small holes 13a and a cylindrical cup-shaped current plate 14 facing each other with a distance from each other using a stopper 16 such as an E-ring. , 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 the same as that of the hot water storage tank 3.
It is similar to

1, a hot water outlet pipe 1' and a hot water supply pipe connection port 22' with a flow rate attenuator 12' provided inside are provided at the top, and a water supply pipe 2' at the bottom.
A water inlet pipe 6' is provided. Then, connect the hot water outlet pipe 1' to the hot water outlet pipe 1 of the hot water storage tank 3, the hot water supply pipe connection port 22' to the hot water supply pipe 8 of the hot water storage tank 3, and the water supply pipe 2' to the water supply pipe 2 of the hot water storage tank 3. The water pipes 6' are connected to the water inlet pipes 6 of the hot water tank 3, respectively.

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 housing the heating circuit and the hot water storage tank 3. 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 sends a signal to the circulation pumps 4a and 4b to drive them. Circulation pump 4. When a and 4b are driven,
The flow switches provided in the water pressure responsive parts 23a and 23b operate and send a signal to the heat source parts 5a and 5b to start ignition and combustion, and the water is circulated and heated.

The high-temperature hot water obtained from 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 tank 3 and the hot water tank 3', respectively, to the upper part of the hot water tank 3, 3'. More temperature stratification. After that, when the water temperature in the lower part of the hot water storage tank 3 rises to the set water temperature (high temperature hot water falls from the upper part to the lower part of the hot water storage tank), the temperature thermistor 9 senses this and stops the circulation pumps 4a and 4b. Circulation pumps 4a, 4b
When the water stops, the float switches of the hydraulic response parts 23a and 23b detect it, and the heat sources 6a and 6b extinguish the fire.

In this boiling process, in the present invention, the flow rates of the circulation pumps 4a, 4b are kept constant, and the heat source parts 5a,
The combustion amount of water 5b is controlled proportionally to keep the temperature of the hot water sent to the hot water supply pipe 8 constant. First, 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 obtained by making the entire hot water storage tank 3 as high temperature layer as possible. Therefore, in this case, when the hot water is on the verge of boiling (the state where the high temperature water has stratified to the bottom of the hot water storage tank), there is a certain temperature boundary layer, so the temperature of the water flowing in from the inlet pipe is not the water temperature, but the water whose temperature has risen slightly. However, since the temperature of the hot water fed into the hot water supply pipe 8 is higher than the set temperature, the heat source parts 6a and 5
A thermistor 16a provided at the outlet of b.

A proportional valve (not shown) that is detected by 16b and adjusts the combustion amount.
It is possible to send a signal to the hot water storage tanks 3 and 3' to reduce the amount of combustion (TDR combustion) and maintain the set hot water temperature at all times, thus establishing the basic conditions for equalizing the hot water temperatures in the hot water storage tanks 3 and 3'.

Next, the tips of the hot water supply pipes 8 and 8' are connected to the small holes 13a provided in the dispersion and jetting plates 13 of the flow rate attenuators 12 and 12' at the upper part of the hot water storage tanks S and 3' to equalize the jetting conditions. The flow velocity is extremely reduced at a position facing into the hot water storage tanks 3 and 3', and the flow perpendicular to the hot water storage tank is jetted almost uniformly in the horizontal direction at a low flow velocity using a cylindrical cup-shaped rectifying plate 14. As a result, diffusion within the hot water storage tank 3 can be prevented, upper temperature stratification of the high temperature hot water can be established, and the temperature distribution in the upper and lower parts of the hot water storage tanks 3 and 3' can be extremely reduced. The performance at this time is shown in FIG.

At this time, the flow rate adjustment valve 11c is adjusted so that the amount of hot water sent to the hot water storage tank 3 and the hot water storage tank 3' is the same.

(2) When dispensing hot water, keep the hot water in the hot water tanks 3 and 3' at a predetermined temperature (e.g. 80°C).
) After the hot water is boiled, open the faucet (not shown) at the tip of the hot water supply pipe 1 and tap the hot water, and low-temperature water is sent from the water supply pipe 2 to the upper part of the hot water pipe 1 in a pushing method. Hot water at a predetermined temperature is synthesized from each storage tank and sent out in large quantities. When hot water is continuously supplied, the amount of water supplied increases near the temperature thermistor 9 provided on the side wall of the hot water storage tank 3, and the temperature of the supplied water is detected and the circulation pump 4a
.

At the same time, the water pressure responsive parts 2'3a and 23b detect the heat source part 5a,
6b starts ignition and combustion (reheating).

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

1. When the heat source part sa', 6b and the circulation pumps 4a, 4b are stopped after boiling, the flow control valves 11a, 11b provided in the heating circuit are completely checked (closed). Rather, a small flow hole 17 is provided, and this small flow hole 17 prevents the specific weight from increasing when the temperature of the water in the heating circuit decreases after boiling due to the influence of the outside temperature. By consciously causing a slight reverse convection from the hot water supply W8, 8' toward the water inlet pipes 6, 6', the temperature of the hot water in the heating circuit can be significantly lowered (in contrast to the water temperature in the conventional example). Since there is no water, it is possible to minimize the sudden drop in the hot water temperature due to the mixing of low temperature water during transient periods in the heat source parts 5a and 5b during reheating.The performance at this time is shown in Fig. 9.At this time, Increasing the reverse convection flow rate can solve the sudden drop in temperature of hot water, but the amount of heat dissipated will increase and hot water will enter the lower part of the hot water storage tank 3, which will affect the temperature distribution. becomes even larger.

Therefore, the reverse convection flow rate is set in consideration of both.

(3) In the event of a failure In order to avoid a complete stoppage of the function in the event of a failure in the heating circuit, a plurality of heating circuits are provided, and a flow rate adjustment valve 11a is provided to eliminate variations in the circulation amount.

A plurality of heating circuits are established by adjusting with the adjustment screw portion 21 provided in 11b. Therefore, in the event that a failure occurs in one of the heating circuits, the remaining heating circuits can perform the same function as the remaining heating circuits, thereby avoiding a complete stoppage of the function.

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

(1) At the time of boiling, the combustion amount is proportionally controlled in a steady state to send a constant hot water temperature to the flow rate attenuator, and by lowering the flow rate, convection in the hot water storage tank can be prevented and the temperature at the time of boiling can be reduced. Since the upper stratification of high-temperature hot water with extremely small distribution is possible, high-temperature hot water can be obtained in a short time (the number of layers of high-temperature hot water can be 75 seconds), 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 is placed inside the hot water storage tank, and furthermore,
It is a sintered metal that can achieve its purpose by inserting and fixing it into the hot water pipe connection port.

It is cheaper than methods using gilt copper or the like.

(3) When the operation is stopped f after boiling, a small amount of high-temperature water is reversely convected in the heating circuit, thereby reducing the amount of heat dissipated and without increasing the temperature distribution in the lower part of the hot water storage tank. Stabilization can be achieved.

(4) Since the heating circuits are connected in parallel, complete stoppage of functionality can be avoided even in the unlikely event of a failure.
In addition to being advantageous when it comes to maintenance, this hot water heater can be used for both home and commercial use by changing the heating circuit from a single heating circuit to multiple heating circuits.

(5) It is possible to provide a hot water boiler with high thermal energy efficiency, which has a large quantity of hot water with stable water temperature (hot water storage function) and a high-temperature hot water density of 9 (instantaneous function) due to the upper stratification system for high-temperature hot water. .

(6) By using multiple types of hot water storage tanks, the price can be reduced, 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 drawings]

Figure 1 is a configuration diagram of a conventional hot water boiler, Figure 2 is a boiling performance diagram, Figure 3 is a performance diagram of four hot water sources, and Figure 4 is a typical start-up performance diagram for an instant water heater. , Fig. 6 is a block 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 rate damping body, Fig. 7 is an enlarged sectional view of the same flow rate regulating valve, and Fig. 8 is an enlarged sectional view of the same flow rate damping body. Fig. 9 shows the hot water temperature performance chart. 3... Hot water storage tank, 3'... Separate hot water storage tank, 4a. 4b...Circulation pump, 6a, 6b...Heat source section, 8...Pa...Hot water pipe, 11a, 1 l b
, 11 c...Flow rate adjustment valve, 12...
・Flow velocity attenuator, 13...distribution jet plate, 14...
... Rectifier plate, 16a, 16b ... Thermistor, 17 ... - Small flow hole, 18゛ ... Float part, 22 - ... Hot water pipe connection port, 23a, 23b・
...Hydraulic response part. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 5
Figure 6

Claims (1)

[Scope of Claims] A hot water supply pipe connection port in which a hot water outlet pipe and a flow velocity attenuator are inserted and fixed in the upper part, and a water inlet pipe is branched from the lower part of a hot water storage tank having a water supply pipe in the lower part, and 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 these plurality of flow channels are integrated into a single hot water pipe, which is connected to the hot water pipe connection port, and A hot water storage tank with the same configuration as the hot water storage tank is installed separately, and a hot water outlet pipe is installed in this separate hot water storage tank. A hot water boiler in which a water supply pipe, a hot water supply pipe, and an inlet pipe are connected to each of the hot water storage tanks.