JPH0132911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water boiler that spouts high-temperature hot water from the upper part of a hot water storage tank and stratifies the temperature thereof, and relates to a boiler structure equipped with a flow rate attenuator at the spouting part of the high-temperature hot water. It is something.

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

In this structure, high-temperature hot water is spouted from the upper part of the hot water storage tank 3 and stratified in temperature. Unless the flow velocity is lowered by making considerable efforts, convection will become intense and the temperature distribution in the upper and lower parts of the hot water storage tank 3 will not be uniform.
(An example of performance is shown in Figure 2.) Next, in the case of reheating after boiling, since an instantaneous water heater is used as the heating source, the predetermined temperature is maintained during the transient period until the steady state is reached. The following low-temperature water will be spouted out (Figure 3 shows the start-up performance of a typical instantaneous water heater). This will cause a decline. Therefore, when hot water is tapped under this condition, there are problems such as the temperature of the hot water partially falling below the predetermined temperature and deteriorating the hot water tap performance (see Section 4).
An example of performance is shown in the figure).

Furthermore, there is a conventional example shown in FIG. 5 that alleviates the latter deterioration in hot water tapping performance. The outline of the configuration is as follows: At the tip of the hot water pipe 8, there is a bottomless distribution tube 15 that is hollow and cylindrical and has small holes 14 throughout the side wall.
The hot water tank 3 is provided at a height from top to bottom in the vertical direction of the hot water storage tank 3.

In this configuration, during the transition period when the instantaneous water heater starts up, the low-temperature water is sent from the top to the bottom of the distribution tube 15, exchanging heat with the high-temperature hot water in the hot water storage tank 3 and increasing in temperature. In cases where it will be partially ejected, and in cases where the distribution tube 1 is
Since the high-temperature hot water that existed in the hot water storage tank 3 is sent to the lower part of the hot water storage tank 3, the temperature distribution in the lower part of the hot water storage tank 3 is disturbed, and the area where the hot water temperature is stable is reduced. Problems will gradually arise in either case.

OBJECTS OF THE INVENTION The present invention is intended to solve these conventional problems, and its first purpose is to minimize the distribution of hot water temperature within the hot water storage tank during boiling. Furthermore, the second purpose is to eliminate a sudden drop in the temperature of hot water.
Furthermore, the third objective is to realize the system with a simple configuration without controlling the circulation pump or controlling the flow rate.

Composition of the Invention In order to achieve this object, the present invention provides a hot water boiler that spouts high-temperature hot water from approximately the top of a hot water storage tank to create a temperature stratification. A hollow cylindrical flow rate attenuator with many small holes is provided on the side wall, and a disk-shaped rectifier with small holes and a diameter larger than the hot water pipe is installed at the connection between the flow rate attenuator and the hot water supply pipe. The partition body is provided perpendicular to the fluid flow, and the flow velocity attenuation body is positioned substantially at the top of the hot water storage tank so as to emit water in the horizontal direction.

With this configuration, during boiling, the pressure and flow rate of the circulation pump are attenuated by the flow rate attenuator, and the hot water is uniformly jetted horizontally into the hot water storage tank, preventing convection and achieving temperature stratification of high-temperature hot water. By spouting low-temperature water at a low flow rate and at the bottom in a linear rather than planar manner, it is possible to prevent diffusion within the hot water storage tank.
This can greatly reduce the sudden drop in hot water temperature.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings of FIGS. 6 to 9. In the drawings, parts that are the same as those in the conventional example shown in FIGS. 1 and 5 are given the same numbers.

In the figure, a hot water storage tank 3 with a water supply pipe 2 at the bottom
The water inlet pipe 6 is branched into connecting pipes 6a and 6b from the other lower part through a check valve 10, and each has a circulation pump 4a, 4b, a heat source part 5a, 5b, and a connecting part 8a, 8.
They are arranged in the order of b and finally converge in the hot water supply pipe 8, and the hot water supply pipe 8 is located substantially at the upper part of the hot water storage tank 3 to form a heating circuit.

In this basic configuration, a flow rate attenuator 12 provided at the tip of the hot water supply pipe 8 is located on the downstream side of the flow, and a rectifying partition body 1 having a small hole 17 in a direction perpendicular to the flow.
8 is provided inside, and an ejection hole 13 formed of a porous material such as a hollow cylindrical wire mesh with a bottom is provided in a direction parallel to the flow. The hot water tank is positioned so that the ejection direction is horizontal to the hot water storage tank.

Next, the hot water storage tank 3 has a mixing chamber 19 whose center protrudes concentrically at the upper end, and the mixing chamber 19
The outlet pipe 1 is taken out from the side wall. moreover,
A temperature thermistor a9 is provided on the lower side wall.

In addition, 11a and 11b are flow rate adjustment units installed between the heat sources 5a and 5b and the circulation pumps 4a and 4b, respectively, and temperature thermistors b16a and 16b are connected to the connecting pipes 8a and 8b on the downstream side of the heat sources 5a and 5b.
It is equipped with

The operation and effects will be explained below separately for boiling and dispensing.

(1) During boiling When the water temperature in the hot water storage tank 3 is lower than the predetermined water temperature, the temperature thermistor a9 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 5a, 5b, and the water is circulated and heated. Thereafter, when the lower part of the hot water tank 3 reaches a predetermined temperature, the temperature thermistor a9 senses this and stops the circulation pumps 4a, 4b. circulation pump 4a,
When the heat source 4b stops, the heat sources 5a and 5b are extinguished by detection by the flow rate switch.

In this boiling process, in this embodiment, the capacity of the circulation pumps 4a and 4b is kept constant (the flow rate is constant), and the amount of combustion in the heat sources 5a and 5b is proportionally controlled to increase the temperature of the hot water sent to the hot water supply pipe 8. is kept constant. In other words, the temperature thermistor b16a, 16b
When the hot water temperature exceeds a predetermined temperature, a signal is sent to a proportional valve (not shown) that adjusts the combustion amount to reduce the combustion amount (TDR combustion) and maintain the predetermined hot water temperature at all times.

From the above, the high-temperature hot water sent from the hot water supply pipe 8 has a diameter larger than that of the hot water supply pipe 8 and has a large opening area, and the flow rate is attenuated by making it into a hollow cylindrical shape with a bottom. The body 12 attenuates the force of the circulation pump and the flow velocity, resulting in an ejection close to static pressure. Furthermore, the diameter of the hot water supply pipe 8 and the diameter of the flow rate attenuator 12 are different, and the flow expands rapidly.
A flow velocity distribution occurs in the diametrical direction from the center, and is made uniform by the structure of the small jet holes 13 of the flow velocity attenuator 12. However, as in this embodiment, the flow regulating partition 18 having the small holes 17 at positions where the diameter changes allows the jet to be ejected almost uniformly in the diametrical direction from the center. It can be configured as follows.

In addition, convection within the hot water tank can be prevented by ejecting hot water uniformly in a horizontal direction concentrically with respect to the hot water storage tank 3, and an upper stratification system of high temperature hot water without temperature distribution is established. The performance in this case is shown in FIG.

(2) When dispensing hot water Even after the hot water in the hot water storage tank 3 has been boiled to the specified temperature, the hot water in the heating circuit drops due to the outside temperature and reaches the water temperature (generally around 5℃ in winter). When the faucet (not shown) at the tip of hot water tap 1 is opened and hot water is tapped, low-temperature water is sent from the water supply pipe 2 and is pushed up into the hot water tap 1 at the top.
A predetermined high temperature hot water is sent out.

Thereafter, a temperature thermistor a9 provided on the lower side wall of the hot water storage tank senses the temperature and sends a signal to the circulation pumps 4a and 4b to drive them. When the circulation pumps 4a and 4b are driven, the heat sources 5a and 5b begin to ignite and reheating is started. At the beginning of this reheating, the heat source part 5a,
The low-temperature water during the transition at the rising edge of 5b is sent to the flow rate attenuator 12.

Under this situation, since the low-temperature water has a higher specific gravity than the high-temperature water existing in the hot water storage tank 3, it will not be spouted horizontally into the hot water storage tank 3 from the small spouting hole 13, but will be spouted downward. Become. Moreover, since the flow velocity is low, the flow form is such that it converges at the vertical center of the hot water storage tank 3.

Therefore, by preventing diffusion over a wide area in the upper part of the hot water storage tank 3, a sudden drop in the hot water temperature when hot water is tapped can be minimized (as shown in Figure 9), and the hot water temperature can be kept at a stable high temperature. You can get hot water.

In addition, in the above embodiment, the hot water supply pipe and the hot water outlet pipe are arranged concentrically, but 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 provided in the hot water storage tank. Needless to say. Further, the above-mentioned protruding mixing chamber may be provided as necessary and may also serve as the upper part of the hot water storage tank.

Effects of the Invention As described above, the hot water boiler of the present invention provides the following effects.

(1) The flow rate attenuator allows the water to be ejected to near static pressure and ejected uniformly in the horizontal direction, minimizing the temperature distribution within the hot water storage tank. You can obtain hot water and improve usability.

(2) The flow velocity attenuator composed of a flow rectifying partition and a wire mesh etc. allows the hot water to be ejected without being diffused by the low-temperature water in the upper part of the tank, so it is simple and inexpensive and can reduce the temperature of hot water. Stable hot water can be obtained.

(3) An inexpensive hot water boiler that achieves its purpose with a simple configuration such as a flow rate attenuator, rather than a method that linearly controls the circulation pump from startup to steady state, or a method that uses heat-responsive valves. It becomes possible to provide

(4) By placing the heating circuits in parallel, complete stoppage of functionality can be avoided in the unlikely event of a failure, resulting in maintenance benefits.

(5) It is possible to provide a hot water boiler with high thermal energy efficiency, which has a hot water storage function that produces a large amount of hot water with a stable temperature, and an instantaneous function that allows hot water to be delivered in a short time.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a conventional hot water boiler, Figure 2 is a boiling performance diagram of the same as above, Figure 3 is a general start-up performance diagram of an instantaneous water heater, Figure 4 is a hot water output performance diagram of the same as above, Fig. 5 is a schematic diagram of another conventional example, Fig. 6 is a configuration diagram of a hot water boiler according to an embodiment of the present invention, Fig. 7 is an enlarged sectional view of the main parts of the same, and Fig. 8 is a boiling performance diagram of the same. , FIG. 9 is a hot water tapping performance diagram of the same as above. 1... hot water outlet pipe, 3... hot water storage tank, 4a, 4b...
Circulation pump, 5a, 5b...Heat source part, 8...Hot water pipe, 12...Flow rate damping body, 13...Ejection small hole, 1
8... Rectifier partition.

Claims (1)

[Claims] 1. Connect the water inlet pipe, circulation pump, heat source, and hot water supply pipes in this order from the bottom of the hot water storage tank, which has a hot water outlet pipe at the top and a water supply pipe at the bottom, and connect the hot water pipe at the tip with a diameter larger than the hot water pipe and a bottom. A heating circuit is formed by providing a hollow cylindrical flow velocity attenuator with a large number of small holes in the side wall, and placing it facing approximately the top of the hot water storage tank so that the fluid is ejected horizontally to the hot water storage tank. . A hot water boiler, in which a rectifying partition body having a disk shape and having a small hole and having a diameter larger than the diameter of the hot water supply pipe is provided perpendicular to the flow of the fluid at the connecting portion between the hot water supply pipe and the flow rate attenuator.