JPS6361578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water boiler that combines a heat source section with a circulation pump and a hot water storage tank, in which a flow rate attenuator is installed in the hot water storage tank to stabilize the temperature of the hot water. The present invention relates to a boiler structure equipped with.

Conventional configuration and its problems A conventional hot water boiler is configured as shown in FIG. That is, a hot water storage tank 3 has a hot water outlet pipe 1 in the upper part and a water supply pipe 2 in the lower part, and from the lower part of the hot water storage tank 3, a circulation pump 4 and a heat source section 5 are connected to a connecting pipe 6,
7 and 8, and the connecting pipe 8 is connected to the substantially upper part of the hot water storage tank 3 to form a heating circuit.

In this structure, the high temperature hot water obtained in the heat source section 5 is
Since hot water is stored from almost the top of the hot water storage tank 3, when boiling the water in the hot water storage tank 3 to a high temperature, the conditions for sending hot water from the connecting pipe 8 to the hot water storage tank 3 must be carefully adjusted. There is a drawback that the temperature distribution in the upper and lower parts of the tank 3 becomes non-uniform. This is especially noticeable when the circulation flow rate is large. Figure 2 shows the performance. Furthermore, when dispensing boiled high-temperature water, an instantaneous water heater is used as the heat source, so the rise characteristics of the heat source have a direct effect. In other words, if the connecting pipe 8 and the heat exchanger 5 of the instantaneous water heater are operated in a state close to the outside temperature (0 to 5°C in winter), low-temperature water will be pumped to a steady state.
There is a drawback that the temperature of the hot water in the hot water storage tank 3 decreases, and the temperature of the hot water that comes out of the hot water decreases rapidly. Figure 3 shows the performance.

Next, the high temperature hot water obtained from the heat source section 5 is transferred to the hot water storage tank 3.
In order to eliminate the sudden drop in hot water temperature due to the mixing of low temperature water when the heat source starts up, there is a conventional example as shown in FIG. That is, a distribution cylinder 12 is provided at the tip of the hot water supply pipe 8, which has a hollow cylindrical shape, has a small hole 13 in the side wall, and has a height from the top to the bottom of the bottomless 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 jetting flow velocity is high, the jetting fluid will be jetted from the lower part of the distribution tube 12 both during the transient period of rising and during the steady state. This can prevent a sudden drop due to the mixing of low-temperature water, but it also prevents high-temperature water from being stratified from the top when boiling the water in the hot water storage tank.

In addition, if the jetting flow velocity is small, the upper part of the high-temperature water will be stratified in the steady state, but the low-temperature water during the transient rise will be concentrated from the lower part, resulting in a sudden drop. However, in the case of a hot water boiler, it is necessary to be compatible, but since the conventional example is a heating circuit, some negative effects are allowed.

Purpose of the Invention The present invention aims to eliminate these conventional drawbacks, and in particular, minimizes the hot water temperature distribution at the time of boiling when the circulation flow rate is large, and prevents sudden changes in the temperature of the hot water at the time of tapping. The purpose is to minimize the amount of down.

Composition of the Invention In order to achieve this object, the present invention has a system in which the heat source part and the hot water storage tank are separated, and the hot water storage tank has a hot water outlet pipe at the top and a water supply pipe at the bottom. The pipes, the heat source, the hot water supply pipe, and the flow rate attenuator are arranged in this order.The flow rate attenuator is located near the hot water outlet pipe installed at the top of the hot water storage tank, and is made of a porous material from which hot water spouts out horizontally. It has a hollow cylindrical shape with a bottom, and is set to eject conditions close to static pressure.

With this configuration, during boiling, the flow velocity attenuator
By attenuating the power of the circulation pump and setting conditions such that the flow velocity does not cause convection within the hot water storage tank (for example, by replacing dynamic pressure with static pressure), temperature stratification is established and temperature distribution can be minimized. Furthermore, in order to prevent a sudden drop in hot water temperature when hot water is tapped, the damping body made of porous material is configured to have a slow initial velocity and distributed spouting. Diffusion over a wide area can be prevented and sudden drops in water temperature can be minimized.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 5 to 8. 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. The water inlet pipe 6 is branched from the lower part of the hot water storage tank 3 through a check valve 10 into 6a and 6b, which are connected to circulation pumps 4a and 4b and a heat source section 5, respectively.
a, 5b, branch pipes 8a, 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 hollow cylindrical flow rate attenuator 12 has a large number of small holes 13 in its side wall, is connected to the hot water supply pipe 8, and is located approximately at the top of the hot water storage tank 3.

The temperature thermistor 9 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.

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

(1) During boiling When the water temperature in the hot water storage tank 3 is lower than the set water 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 heat source parts 5a, 5b are detected by flow rate switches (not shown) provided in the heat source parts 5a, 5b.
is ignited and the water is circulated and heated. After that, when the water temperature at the bottom of the hot water storage tank 3 rises to the set water temperature,
The temperature thermistor 9 senses and the circulation pumps 4a, 4
Stop b. When the circulation pumps 4a, 4b are stopped, the heat sources 5a, 5b are extinguished by detection by the flow rate switch.

In this configuration, the flow rate of the circulation pumps 4a, 4b is kept constant, and the combustion amount of the heat sources 5a, 5b is determined by a temperature thermistor (not shown) installed in the hot water supply pipe 8, The amount of combustion is controlled proportionally so that the temperature of hot water fed to the tank remains constant.

In this boiling process, by setting the flow rate attenuator 12 approximately in the center in the upper part of the hot water storage tank 3, and by forming it in the shape of a hollow cylinder with a bottom from a porous material, the hot water supply pipe The high-temperature hot water from 8 is under jetting conditions close to static pressure, preventing convection within the hot water storage tank 3, and achieving upper stratification of high-temperature hot water without temperature distribution. The performance at this time is shown in FIG.

(2) At the time of hot water dispensing After the hot water storage tank 3 has been heated to a predetermined temperature (for example, 80°C), the hot water in the heat sources 8a and 8b has decreased due to the outside temperature, and when the hot water has reached the water temperature, the hot water dispensing pipe is opened. 1
When a faucet (not shown) at the tip is opened to dispense hot water, low-temperature water is fed through the water supply pipe 2, and high-temperature water at a predetermined temperature is sent out from the hot water dispensing pipe 1 at the top in a pushing up manner.

Thereafter, the temperature thermistor 9 provided on the side wall of the hot water storage tank 3 senses the temperature and sends a signal to the circulation pumps 4a, 4b to drive them. When the circulation pumps 4a, 4b are driven, the heat sources 5a, 5b begin to ignite due to detection by the flow rate switches provided in the heat sources 5a, 5b, and reheating is started.

At the beginning of this 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 flow rate attenuator 12 is
In addition, it is made of porous material in the shape of a hollow cylinder with a bottom, and the opening degree of the porous material is set so that the ejection conditions are close to static pressure and the ejection is dispersed rather than concentrated. By doing so, 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 a sudden drop in the hot water temperature can be minimized. The performance at this time is shown in FIG.

Effects of the Invention As described above, according to the hot water boiler of the present invention,
The following effects can be obtained.

(1) A flow rate attenuator is installed near the hot water outlet pipe installed at the top of the hot water storage tank, and is made of a porous material that allows hot water to spout horizontally, forming a hollow cylindrical shape with a bottom at the bottom. Since it is a condition,
Convection can be prevented within the hot water storage tank, and stratification can occur from the top of the hot water, which has an extremely narrow temperature distribution during boiling. This allows for quick access to hot water.

Furthermore, it is possible to prevent diffusion of low-temperature water in the hot water storage tank when the heat source is turned on, thereby stabilizing the temperature of hot water when hot water is tapped.

(2) Rather than linearly controlling the circulation pump or installing a flow control valve in the water supply pipe to ensure performance during boiling and dispensing, the system achieves its purpose with a simple configuration; This can be achieved at an extremely low cost.

(3) High thermal energy efficiency can be achieved, with a hot water storage function capable of dispensing a large quantity of hot water with stable water temperature, an upper stratification system for high temperature hot water, and an instantaneous hot water draw function.

(4) High temperature hot water is concentrated in the upper part of the hot water tank,
In addition, since the bottom of the flow rate attenuator is at the bottom and is formed of a porous material from which hot water spouts out in a horizontal direction, hot water can be drawn even more quickly.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a conventional hot water boiler, Fig. 2 is a boiling performance characteristic diagram same as above, Fig. 3 is a hot water temperature performance characteristic diagram same as above, and Fig. 4 is a configuration diagram of another conventional example. Fig. 5 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 only the upper part of the boiler, Fig. 7 is a boiling performance characteristic diagram of the boiler, and Fig. 8 is It is a characteristic diagram of the hot water temperature performance of the same boiler. 3...Hot water tank, 4a, 4b...Circulation pump, 5
a, 5b...Heat source section, 8...Hot water supply pipe, 12...Flow rate attenuator.

Claims (1)

[Claims] 1 A porous structure that connects the inlet pipe at the bottom of a hot water storage tank with a hot water outlet pipe at the top and a water supply pipe at the bottom, and from which hot water spouts horizontally into the hot water tank near the hot water outlet pipe installed at the top of the hot water storage tank. A flow rate attenuator is provided, which has a hollow cylindrical shape with a bottom at the bottom and is set to a jetting condition close to static pressure. A hot water boiler with pipes connected in sequence.