JPS5938550A - Hot-water boiler - Google Patents

Abstract

PURPOSE:To enable to keep a temperature of hot water to be fed into from a feed hot water pipe at a fixed level, by a method wherein a heat source part is separated from a hot water tank, ducts having a circulating pump and a heat source part respectively are pulled out from the lower part of the hot water tank, a plurality of these ducts is collected at a single feed hot water pipe and connected with the inside of the hot water tank. CONSTITUTION:When a temperature of water in a hot water tank 3 is lower than a given temperature of a hot water, circulation pumps 4a and 4b are driven by application of a signal to the pumps through sensing the temperature by a temperature thermistor 9. When the circulating pumps 4a and 4b are driven, a heat source parts 5a and 5b are ignited through sensing by a flow switch (not illustrated herein) provided on the heat source parts 5a and 5b, and water is heated through circulation. In a process of this heating-up, quantities of flows of the circulating pumps 4a and 4b are made constant, burning quantities of the heat source parts 5a and 5b are controlled proportionally and a temperature of hot water to be fed into a feed hot water pipe is fixed. With this construction, when a temperature of hot water becomes more than a given level, temperature thermistors 16a and 16b are operated so that a signal is sent to a proportional valve (not illustrated herein) adjusting the burning quantities, the burning quantities are reduced (TDR burning) and the temperature of the hot water becomes the given level always.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention separates a hot water storage tank and a heat source, and sends high-temperature hot water obtained from a plurality of heat sources to a plurality of circulation pumps from the top of the hot water storage tank. The present invention relates to a hot water boiler that stratifies high-temperature hot water, and relates to a boiler structure in which the ejection part is equipped with a flow rate attenuator and the heat source is operated under proportional control.

Conventional configuration 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 in the upper part and a water supply pipe 2 in the lower part, a lower part of the hot water storage tank 3, a circulation pump 4,
The heat source parts 5 are sequentially connected with connecting pipes 6°7.8, and the connecting pipes 8
is connected to the upper part of the hot water storage tank 3 to form a heating circuit.

In this structure, the high temperature hot water obtained from the heat source section 5 is transferred to the hot water storage tank 3.
Since hot water is stored from the street of the hot water tank 3, when boiling the water in the hot water tank 3 to a high temperature, the conditions for spouting from the connecting pipe 8 to the hot water tank 3 must be carefully adjusted. The disadvantage is that the temperature distribution above and below is uneven. for example,
When the flow rate of the circulating flow rate is high, the diffusion within the hot water storage tank 3 becomes more intense and becomes more non-uniform. This is particularly noticeable when the circulation flow rate is large. The performance in this case is shown in FIG.

Furthermore, if you want to tap the hot water after a while after boiling, please temporarily set the heat source section 5 to the outside temperature (0 in winter).
When operating under conditions close to 5℃), since the instantaneous water heater is used as the heat source, low-temperature water will be pumped to a steady state (Figure 3 shows the start-up of a typical instantaneous water heater). There is a drawback that the temperature of the hot water in the hot water storage tank 3 (indicating performance) decreases compared to the temperature when it is boiled, and the hot water temperature drops suddenly in some parts. An example of this performance is shown in FIG.

Next, in a structure in which high-temperature hot water obtained at the heat source is stratified from the top of the hot water storage tank, it is possible to alleviate the sudden drop in hot water temperature caused by the mixing of low-temperature water at 9 hours after the heat source starts up. Therefore, there is a conventional example as shown in FIG. In other words, at the tip of the hot water supply pipe 8, a small hole 1 is formed in a hollow cylindrical shape and extends over the entire side wall.
4, a bottomless distribution cylinder 15 is provided, and the height extends from the top to the bottom of the hot water storage tank 3. This is due to forced convection by the circulation pump 4, so that all of the water in the hot water storage tank 3 is under dynamic pressure. Therefore, when the jet flow velocity is large,
The water is ejected from the lower part of the distribution tube 15 both during a transient period of rising and during a steady state. This can prevent the entire area of the hot water storage tank from being drenched due to low-temperature water being mixed in, but it also prevents high-temperature water from being stratified from the top when boiling the water in the hot water storage tank.

If the ejection flow velocity is still small, the upper stratification of high-temperature hot water will be established in the steady state, but the low-temperature water during the transient rise will be transferred from the upper part of the distribution tube 15 to the lower part in the process of being sent from the upper part to the lower part of the distribution tube 15.
The temperature will increase as a result of heat exchange with the hot water inside the tank, and the temperature will rise, resulting in partial spouting on the way, or the temperature distribution at the bottom of the hot water storage tank will change because the high temperature hot water inside the distribution tube 15 is sent to the bottom of the hot water storage tank. As a result, the range of stable hot water temperature (effective hot water storage amount) decreases.

However, it is somewhat better than the example shown in FIG. A performance example in this case is shown in FIG. Since this conventional example is a heating circuit, some adverse conditions can be tolerated.

Next, in the case of the upper stratification method for high-temperature water, unless the temperature of the hot water sent through the hot water supply pipe is kept constant during the boiling process to a steady state, it is basically impossible to equalize the upper and lower temperatures in the hot water storage tank. It is something.

OBJECTS OF THE INVENTION The present invention is intended to eliminate these conventional drawbacks, and to minimize the distribution of hot water temperature during boiling, especially when the circulating flow rate is large, and at the time of tapping.

The purpose is to minimize the sudden drop in hot water temperature.

Structure of the Invention In order to achieve this object, the present invention employs a method in which a heat source section and a hot water storage tank are separated, and a flow path having a circulation pump and a heat source section is drawn out from the bottom of the hot water storage tank, and these multiple streams are connected. The channels are gathered into a single hot water supply pipe and connected to a flow rate attenuator at the upper part of the hot water storage tank.

With this configuration, during boiling, the flow velocity damping body
Attenuating the force of the circulation pump and setting conditions so that the flow velocity does not produce convection in the hot water storage tank (for example, replacing dynamic pressure with static pressure), and vertical flow using a flow velocity attenuator. By ejecting the hot water extremely uniformly in the horizontal direction, the temperature stratification of the high-temperature hot water is established, and the temperature distribution can be minimized. Furthermore, even if there is a sudden drop in the temperature of hot water in some areas during taping, the flow velocity attenuator is configured so that the initial velocity is slow and the water is spouted in a dispersed manner. This prevents the water from dispersing over a wide area within the hot water storage tank, and drastically reduces the chance of a sudden drop in hot water temperature.

DESCRIPTION OF EMBODIMENTS Two embodiments of the present invention will be described below with reference to FIGS. 7 to 10. In the figures, parts that are the same as those in FIG. 1, which is a conventional example, are given the same numbers.

In the figure, a hot water storage tank 3 includes a hot water outlet pipe 1 at the top and a water supply pipe 2 at the bottom. At the bottom of the hot water storage tank 3, the water inlet pipe 6 is branched into 6a and 6b via a check valve 10, and each has a circulation pump 4a and 4b and a heat source section 5a.

5b, branch pipes 8a and 8b of the hot water supply pipe 8, and the hot water supply pipe 8 are arranged in this order to form a heating circuit.

The bottomed hollow cylindrical flow velocity damping body 12 has a side wall made of porous material and has a large number of small ejection holes 13.
The high-temperature hot water from the hot water supply pipe 8 is fed vertically from above to the bottom of the hot water tank 3 on the road inside the hot water tank 3, and the spouting direction is horizontal to the hot water tank 3. It is arranged so that

The temperature temperature resistor I9 is provided on the lower side wall of the hot water storage tank 3. Moreover, 11a and 11b are flow rate regulating valves, which are respectively provided on the upstream side of the heating circuit.

Furthermore, connecting pipes 8a and 8 on the downstream side of the heat source parts 5a and 5b
Temperature thermistors J16a and 16b are provided at b.

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

(1) At the time of boiling When the water temperature in the hot water storage tank 3 is lower than the set water temperature, the temperature thermistor t9 senses it and sends a signal to the circulation pumps 4a and 4b to drive them. When the circulation pumps 4a, 4b are driven, the heat sources 5a, 5b are ignited by detection by flow rate switches (not shown) provided in the heat sources sa, 5b, and the water is circulated and heated. After that, when the water temperature in the lower part of the hot water storage tank 3 rises to the set water temperature, the temperature thermistor I9 senses it and the circulation bonder 4a is activated.

Stop 4b. When the circulation pumps 4a, 4b are stopped, the heat sources 5a, sb are extinguished by detection by the flow rate switches.

In this boiling process, the present invention keeps the capacity of the circulation pumps 4a and 4b constant (the flow rate is constant),
The amount of combustion in the heat sources sa and sb is controlled proportionally to keep the temperature of the hot water fed into the hot water pipe constant. 2-inch, connecting pipe sa, s
Temperature thermistors b16a and 16b installed in b are proportional valves (not shown) that adjust the combustion amount when the hot water temperature exceeds the set temperature.
The system sends a signal to the engine to reduce the amount of combustion (TDR combustion) and maintain the set water temperature at all times.

Is there still a temperature thermistor installed at the bottom of the side wall of hot water tank 3?
The temperature thermistor lθ and the temperature thermistor lθ have a circuit configuration such that the set hot water temperature is always the same.

From the above, by setting the flow velocity attenuator on the road of the hot water storage tank and by making the side wall of the hollow cylinder with a bottom porous, the high temperature hot water from the hot water supply pipe 8 can be vertically By uniformly ejecting the jet in the horizontal direction from the entire area of the many small jet holes in the side wall, and by making the jet under conditions close to static pressure,
Convection within the hot water storage tank 3 can be prevented and high-temperature hot water can be stratified in the upper part without temperature distribution. The performance at this time is shown in FIG.

(2) When dispensing hot water After the hot water in the hot water storage tank 3 has been boiled to a predetermined temperature (for example, ao°C), after a while, the hot water in the heating circuit, including the hot water in the heat source, reaches the outside temperature. When the faucet (not shown) at the tip of the hot water supply pipe is opened to dispense hot water when the water temperature has decreased and reached the water temperature, low-temperature water is pumped through the water supply pipe and is pushed up through the hot water supply pipe at the top to reach a predetermined temperature. hot water is sent out.

After that, the temperature thermistor/
9 senses and sends a signal to the circulation pumps aa and 4b to drive them. When the circulation bonders 4a and 4b are driven, the heat source section 5a,
The heat source parts sa and s are detected by the flow rate switch provided in 5b.
b begins to ignite and reheating begins.

At the beginning of reheating, low-temperature water during the transient rise of the heat sources 5a and 5b is sent from the hot water pipe 8.

In this process, the static pressure is reduced by providing the flow rate attenuator 12 at the top of the hot water storage tank 3 and by having a hollow cylindrical shape with a bottom and a large number of small ejection holes in the vertical vertical side walls. Since the flow velocity is close to that of the hot water supply pipe 8 and the water is dispersed rather than concentrated, the transient low temperature water from the hot water supply pipe 8 can be prevented from spreading over a wide range within the hot water storage tank 3, and the temperature of the hot water can be prevented from rapidly increasing. Down can be minimized. The performance at this time is shown in FIG.

Effect of the invention The hot water boiler of the present invention provides the following effects.

(1) During boiling, in a steady state, a constant temperature of hot water is sent to the flow rate attenuator by proportionally controlling the combustion amount, and the flow rate attenuator is attached to the bottomed hollow cylindrical side wall on the road of the hot water storage tank. By using porous materials, the ejection conditions are close to static pressure, preventing convection within the hot water storage tank, and creating an upper stratification of hot water with very little temperature distribution during boiling, allowing hot water to be obtained in a short time. (It is possible to quickly obtain high-temperature water, which improves usability.

(2) By using the same flow velocity attenuator as above and providing a large number of small ejection holes on the vertical vertical side walls, it is possible to disperse ejection and eject at a level close to uniform static pressure. This prevents contamination from spreading in the hot water storage tank and stabilizes the temperature of hot water when hot water is dispensed.

(3) Rather than linearly controlling the circulation pump from startup to steady state or installing a flow control valve in the hot water supply pipe f to ensure performance during boiling and dispensing, simple The configuration achieves the purpose and can be realized at an extremely low cost.

(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 in terms of maintenance, this hot water boiler can be used for home use to 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 amount of hot water with a stable temperature (hot water storage function) and a high-temperature hot water upper stratification system to quickly draw high-temperature water (instantaneous function).

[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 typical start-up performance diagram for an instantaneous water heater, and Figure 4 is a hot water temperature performance diagram. Figure 5 is a configuration diagram of another conventional example, Figure 6 is a hot water temperature performance diagram of another conventional example,
FIG. 7 is a configuration diagram of a hot water boiler according to an embodiment of the present invention, and FIG.
The figure is an enlarged sectional view of the main part, Figure 9 is the boiling performance diagram,
FIG. 10 is a performance diagram of the hot water temperature. 3...Hot water storage tank, 4a, 4b...Circulation pump, 5a, 5b...Heat source section, 8...Hot water supply pipe, 12...Flow rate Damping body, 13...Ejection small hole, 16a, 16b...Temperature thermistor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure! Fig. 2 Fig. 3 Fig. Thick Man ■ Mokusaija Fig. 4 Highlights ■ Opening Fig. 7 Fig. 6 Unexamined Patent Application Publication No. 9 Fig. 10, 44 t 5% II' To Complete I) Commissioner of the Japan Patent Office Tono 1 Indication of the case 1982 Patent Application No. 150569 2 Name of the invention Hot water boiler 3 Relationship with the amended case Patent application
Pillar of Fire Location Bold Kadoma 1006, Kadoma City, Osaka Name (582) Representative of Matsushita Electric Industrial Co., Ltd.
Toshihiko Yamashita 4 Agent 571 Address Matsushita Electric Industrial Co., Ltd. 6, 1006 Bold Kadoma, Kadoma City, Osaka Prefecture Insert the legal text after "indicates" on page 10, line 2 of the detailed statement of contents of the amendment. To do. ``Although in the above embodiment, the hot water supply pipe and the hot water outlet pipe are arranged concentrically, the present invention is not limited to this configuration, and the hot water supply pipe and the hot water outlet pipe may be separated and placed in the hot water storage tank. It goes without saying that this is a good thing. Also, the above-mentioned protruding mixing chamber can be provided as needed, and the upper part of the hot water storage tank can also be used.

Claims (1)

[Claims] A hot water boiler is assembled in a hot water storage tank with a hot water outlet pipe at the top and a water supply pipe at the bottom, and is connected to a flow rate attenuator at the top of the hot water storage tank.