JPH0457938B2 - - 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 eject high-temperature hot water obtained from the heat source from the top of the hot water storage tank to stratify the hot water. This invention relates to hot water boilers that are becoming increasingly popular, and relates to a boiler structure that is equipped with a flow rate attenuator in the ejection part.

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 a circulation pump 4, a check valve 10, and a heat source part 5 are connected to connecting pipes 6, 7, and 8 in order from the lower part of the hot water storage tank 3. 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 upper part 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. There is a drawback that the temperature distribution in the upper and lower parts of the chamber becomes 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, when hot water is tapped after a while after boiling, the temperature of the heat source section 5 decreases moment by moment because the check valve 10 stops the flow in the heating circuit while the operation is stopped. . Eventually, the temperature in the heating circuit reaches the water temperature level. Now, suppose that the heat source part 5 is at outside temperature (0 to 5 degrees Celsius in winter)
When operating under conditions close to , since an 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 performance of a typical instantaneous water heater). There is a drawback that the temperature of the hot water in the hot water storage tank 3 decreases compared to the temperature when it is boiled, and the temperature of the hot water that comes out of the hot water tank 3 drops suddenly in some areas. An example of this performance is shown in the fourth
As shown in the figure.

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.

Purpose of the Invention The present invention is intended to eliminate such conventional drawbacks, and its purpose is to minimize the extreme reduction in the hot water temperature distribution during boiling and the rapid drop in the hot water temperature during dispensing. It is something to do.

Composition of the Invention In order to achieve this object, the present invention adopts a system in which a heat source part and a hot water storage tank are separated, and a heating circuit having a circulation pump, a flow rate adjustment valve, and a heat source part is taken out from the bottom of the hot water storage tank, and the tip of the heating circuit is connected to a hot water supply tank. The pipe is connected to the hot water pipe connection port provided at the top of the hot water storage tank, and a flow velocity attenuator is inserted into the hot water pipe connection port, with a dispersion jet plate and a rectifying plate fixed facing each other at a distance. It is fixed to the upper part of the hot water storage tank, and the flow rate regulating valve has a small flow hole to provide a check function.

With this configuration, during boiling, the dispersion jetting plate equalizes the jetting conditions, the flow velocity is extremely reduced at the position facing the hot water storage tank, and the rectifier plate transforms the vertical flow into a horizontal flow at a low flow velocity. By ejecting water almost uniformly in the direction, temperature stratification of the hot water is established, and the temperature distribution can be minimized. Furthermore, in order to prevent a sudden partial drop in the water temperature when hot water is dispensed, instead of completely blocking the heating circuit (closed circuit) with a flow rate adjustment valve after boiling the water in the hot water storage tank, By using the flow check function, the high-temperature hot water in the heating circuit flows from the hot water supply pipe toward the water inlet pipe, so hot water is present in the heating circuit, so when restarting the operation after boiling, Since there is no mixing of low-temperature water, rapid temperature drops can be minimized.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 5 to 9.
The explanation will be 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 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. From the lower part of the hot water storage tank 3, the inlet pipe 6 branches into 6a and 6b, which are connected to circulation pumps 4a and 4b and a flow rate adjustment valve 11, respectively.
a, 11b, heat source portions 5a, 5b, branch pipes 8a, 8b of hot water supply pipe 8, and hot water supply pipe 8 in this order to form a heating circuit.

The flow velocity attenuator 12 includes a dispersion jet plate 13 having a plurality of small holes 13a and a cylindrical cup-shaped current plate 1.
4 are separated from each other by fixing fittings 15 such as E-rings to face each other, and the hot water from the hot water supply pipe 8 is spouted horizontally at the rectifying plate 14 facing into the hot water storage tank 3. It is inserted and fixed inside a hot water supply pipe connection port 22 provided at the upper part 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, and temperature thermistors 16a, 16b are provided in the connecting pipes 8a, 8b downstream of the heat sources 5a, 5b.

Further, each of the flow rate regulating valves 11a and 11b has a float portion 18 having a small flow hole 17 in the center in an internal passage, and a threaded portion 20 in a direction perpendicular to the passage. Adjustment screw part 2
1 was inserted. 19 is a presser metal fitting.

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 in the lower part of the hot water storage tank 3 rises to the set water temperature, the temperature thermistor 9 senses it and the circulation pumps 4a, 4b are activated.
stop. When the circulation pumps 4a, 4b are stopped, the heat sources 5a, 5b are extinguished by detection by the flow rate switch.

In this boiling process, the one of the present invention
The capacity of the circulation pumps 4a, 4b is kept constant (the flow rate is constant), the combustion amount of the heat sources 5a, 5b is proportionally controlled, and the temperature of the hot water sent to the hot water supply pipe is kept constant. In other words, when the temperature thermistors 16a and 16b installed in the connecting pipes 8a and 8b exceed the set water temperature, they send a signal to a proportional valve (not shown) that adjusts the combustion amount, reducing the combustion amount (TDR combustion). The water temperature is always set.

Further, the temperature thermistor 9 provided at the lower part of the side wall of the hot water storage tank 3 and the temperature thermistor 16 have a circuit configuration such that the set hot water temperature is always the same.

From the above, it is clear that the flow rate attenuator 12 is set at the top of the hot water storage tank, and that the hot water from the hot water supply pipe 8 is extremely decelerated in the hot water storage tank 3, and that the vertical jetting is uniform in the horizontal direction. By ejecting the
The jetting conditions are low flow velocity, 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) When dispensing hot water After the hot water in the hot water storage tank 3 has been boiled to a predetermined temperature (e.g. 80°C), the faucet (not shown) at the tip of the hot water supply pipe is opened and hot water is dispensed. Low-temperature water is pumped in, and high-temperature water at a predetermined temperature is sent out from the upper tap pipe in a push-up method.

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 is prevented from being sent through the hot water pipe 8 when the heat sources 5a and 5b are rising excessively.

In other words, after boiling, the temperature of the water in the heating circuit decreases moment by moment due to the outside temperature, such as in winter. Therefore, a small flow hole 17 is provided in the flow rate regulating valve so that the specific weight increases and descends toward the bottom, thereby causing reverse convection in the heating circuit.
Therefore, even after boiling, the hot water in the heating circuit does not reach the water temperature, so it is possible to reduce the sudden drop in temperature of hot water when hot water is tapped. The performance at this time is the 9th
As shown in the figure. At this time, if the reverse convection flow rate is increased, the sudden drop in hot water temperature can be resolved, but on the other hand, the amount of heat dissipated increases and the temperature distribution in the lower part of the hot water storage tank becomes large, resulting in a stable hot water output rate. will decrease.

Further, if reverse convection is completely eliminated, the same drawbacks as in the conventional example will occur, and the diameter of the small flow hole must be set in consideration of both.

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 rate attenuator is composed of a dispersion jet plate and a current plate, and the current plate faces into the hot water storage tank. Moreover, the purpose can be achieved by inserting and fixing the flow rate plate into the hot water supply 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 released is small, and the temperature distribution in the lower part of the hot water storage tank is not increased, making the temperature of the hot water stable. 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 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 that quickly draws hot water (instantaneous function).

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional hot water boiler, Figure 2 is a boiling performance diagram of the same, Figure 3 is a typical start-up performance diagram of an instantaneous water heater, and Figure 4 is a performance diagram of the same hot water temperature. , FIG. 5 is a block diagram of a hot water boiler according to an embodiment of the present invention, FIG. 6 is an enlarged cross-sectional view of the same flow velocity damping body, and FIG.
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 performance diagram. 3...Hot water tank, 4a, 4b...Circulation pump, 5
a, 5b...Heat source part, 8...Hot water pipe, 11a, 1
1b...Flow rate adjustment valve, 12...Flow rate damping body, 13
... Dispersion ejection plate, 14 ... Rectifier plate, 16a, 16
b...Thermistor, 17...Small flow hole, 18...
Float part, 22...Hot water pipe connection port.

Claims (1)

[Claims] 1. A hot water storage tank is provided with a hot water outlet pipe and a hot water supply pipe connection port at the top and a water supply pipe at the bottom, and from the bottom of this hot water storage tank,
A heating circuit including a circulation pump, a flow rate adjustment valve, and a heat source is provided, a hot water pipe at the tip of the heating circuit is connected to the hot water pipe connection port, and a distributed jet plate and a rectifying plate are installed at a distance inside the hot water connection port. A hot water boiler in which a flow velocity attenuator is inserted which is fixed to face the hot water tank, and a rectifier plate is installed at a position facing approximately the top of the hot water storage tank.