JPS608589Y2 - heating water heater - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a heating water heater.

Conventional two-circuit heating water heaters for supplying hot water and heating have a temperature control of about 80° C., and heating piping has been constructed with relatively large diameter pipes.

However, in order to reduce equipment costs, etc., a method is being adopted in which small-diameter pipes are used to reduce the amount of hot water circulated and high-temperature water is flowed to increase the temperature difference depending on the heating load (indoors).

However, in such a method, the temperature of the hot water in the boiler must be controlled at a high temperature, and at high temperatures, a problem arises regarding the upper limit temperature for hot water supply.

Furthermore, the high temperature water inside the boiler can easily generates steam, causing problems with venting, and if air remains in the upper part of the can, corrosion of the can material may occur.

Furthermore, in heating water heaters that perform high temperature control such as the one targeted by the present invention (this also applies to general heating and water heaters), the heating and hot water supply loads fluctuate; A heating and water heater with a heating and hot water output that matches the maximum load is selected.

However, in a state where the hot water supply output and the hot water supply load are perfectly balanced, the temperature inside the can will not reach a stacked state, but this only occurs when the hot water supply output and the hot water supply load are in an ideal state.

Further, even when there is a heating load, the hot water inside the can circulates, so that the temperature inside the can does not stack up.

However, when considering the case where there is no heating load and only a hot water supply load, in reality the hot water output and the hot water supply load are not balanced, and therefore various methods are used to maintain a more perfect balance. However, if, for example, the hot water supply output exceeds the hot water supply load, depending on the position of the hot water supply heat exchanger or temperature control switch, high temperature water may remain at the top of the can, creating a dangerous situation. There is.

In other words, if hot water in the can is kept at a constant high temperature and a hot water supply load is applied, the temperature control switch is located in the middle or lower part of the can, and the hot water heat exchanger is also located in the middle or lower part of the can. When the can body is heated, the hot water inside the can below the middle part of the can undergoes a large heat exchange with the hot water heat exchanger, so the high temperature water in the upper part of the can remains (this part is called the high temperature heat storage area). ).

Then, when the temperature control switch installed below the middle part of the can body detects that the temperature of the hot water in the can below the middle part of the can body has fallen below the set value, and the heating device is activated again, the high temperature High-temperature water stays in the heat storage part, forming a layered state, and eventually boils.

Also, if the temperature control switch is located at the top of the can body and the hot water heat exchanger is located below the middle part of the can body, the hot water inside the can at the top of the can body is connected to the hot water heat exchanger in the same way as above. Due to the large amount of heat exchange, a high-temperature heat storage area remains at the top of the can, which means that even if the hot water supply load is not met, the temperature control switch installed at the top of the can no longer issues a reheating signal. Become.

On the other hand, if the temperature control switch is located in the middle of the can and the hot water heat exchanger is located in the upper part of the can, the above-mentioned high-temperature heat storage area will not occur when the hot water supply load exceeds a certain level; When there is no load or a minimal hot water supply load, a high temperature heat storage section still occurs.

Similarly, even if the temperature control switch and the heat exchanger for hot water supply are both located at the upper part of the can body, a high-temperature heat storage portion is generated when there is no load on the hot water supply.

In such cases, a high-temperature heat storage area occurs because there is heat storage in the heat transfer part (smoke pipe) of the can body, and this heat storage causes the water inside the can to reach a higher temperature than the temperature control switch setting. .

Therefore, if we take into consideration the temperature rise of the water inside the can due to heat accumulation in the heat transfer part of the can, it is close to the allowable limit <(90~9
3°C), temperature control becomes impossible.

In addition, if the temperature control switch is installed in the middle or lower part of the can, the outlet temperature during heating load will exceed the control temperature due to heat accumulation in the heat transfer part of the can, making high temperature control difficult. .

In view of the above-mentioned problems, the present invention satisfies the basic functions of a heating water heater and maintains the water temperature close to the permissible limit (90 to 93 degrees Celsius).
), and also provides a heating water heater that can perform good control without boiling the hot water in the can.

Preferred embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a hot water tank for heating, 2 and 3 are heating return and outgoing paths led out from the upper and lower parts of the tank 1, and the return path 2 in the lower part of the tank is connected to a hot water circulation pump (not shown), and the outgoing path in the upper part of the tank. 3 is connected to a heat radiator (not shown).

Reference numeral 4 denotes a heat exchanger for hot water supply, and its structure is either a tank type as shown in Fig. 1 or a reel type as shown in Fig. 2, and its lower water supply port 5 and upper hot water supply outlet 6 are respectively heated. It is provided to penetrate the side wall of the water tank 1.

The water supply port 5 is connected to a distern or check pressure reducing valve (not shown), and the hot water supply outlet 6 is connected to a safety valve and hot water tap (not shown).

7 is a combustion chamber, which may have a jacket type structure as shown in FIG.

8 is a smoke pipe provided vertically penetrating inside the hot water tank 1,
It consists of a single tube or multiple tubes.

The can upper part 9 has a shape as shown in FIG. 1 or 3, and a part of the can upper part 9 is connected to the air separator 1.
It is connected to 2 by a large diameter pipe.

Reference numeral 10 denotes an annular bulkhead, which is disposed between the heat exchanger 4 and the smoke pipe 8, whose lower end extends below the water supply inlet 5 of the heat exchanger, and whose upper end extends below the water supply inlet 5 of the heat exchanger 4. Exit 6
It is located close to the can wall of the upper part of the can body so that the gap between the upper part of the can body and the can wall is narrow enough to ensure necessary and sufficient circulation stirring of the hot water in the can by natural convection.

According to experiments, in the case of a heating water heater with an output of about 24,000 kcal/h, this gap is about 20 to 30 mm, which of course varies depending on the shape of the can and the output of the can.

The shape of the annular partition wall is determined according to the shape of the can body, for example, the shape of the third
As shown in the figure, it is located in the upper part 9 of the can body in a funnel-shaped manner, or as shown in FIG. 1, it is located straight in the upper part 9 of the can body.

Reference numeral 11 denotes a temperature control switch protection tube, the tip of which protrudes to the upper center of the annular bulkhead 10, which is the position where the temperature of the hot water in the can is at its highest. The tip of a switch (not shown) is also located at the upper center of the annular partition wall 10.

Next, to explain the movement of hot water in the can, the water in the can heated by a combustion device or heating device (not shown) provided in the combustion chamber 9 becomes high-temperature water and rises to the upper part of the can.

The heated hot water passes inside the annular partition wall 10 and reaches the upper part of the can body.

At this point, convection within the can begins with the annular partition wall 10 as a boundary.

The heating appliance stops when the temperature of the hot water inside the annular partition wall 10 reaches the set temperature of the temperature control switch.
At this time, the temperature of the hot water outside the annular partition has not yet reached the set temperature, so convection occurs across the annular partition 10, absorbing the amount of heat held by the can body heat transfer part (fume pipe 8). Therefore, the temperature of the hot water inside the can remains almost constant.

As a result, when a hot water supply load is applied, the hot water supply heat exchanger 4
The water flowing inside exchanges heat with the hot water inside the can outside the annular partition 10, and the hot water inside the can after this heat exchange has a higher specific gravity and flows toward the lower part of the hot water tank 1.

The hot water flowing into the lower part of the hot water tank then exchanges heat with the flue pipe 8 inside the partition wall 10, rises, and circulates inside the hot water tank, so that the high temperature heat storage part does not remain in the upper part and allows the temperature of the water in the hot water tank. Even if the temperature is raised close to the limit, boiling will not occur and the boiler can function satisfactorily.

As actual data, boiler operation was started with water in the can at 25°C in an environment with an outside temperature of 23.6°C, and the temperature ranged from 39.5 to 90.5°C.
to stop the operation, and after a certain period of time, the heat exchange coil
When water is supplied at 7.6°C and hot water is tapped, if there is no annular partition, the temperature at the top of the can reaches a maximum of 104°C depending on whether the heating device is turned on or off, and the difference from the average temperature at the center of the can is about 13.
When the temperature reaches 0 to 20.0°C, the temperature control switch is set to the position where it can most sensitively detect the hot water temperature inside the can, and even if the temperature control switch cannot meet the hot water output in the heat exchanger, it sends a reheating signal. Meanwhile, boiling steam from the expansion tube of the can reached up to distanced, creating an extremely dangerous situation.

On the other hand, an annular partition wall is provided so that its upper end is close to the can wall at the upper part of the can body, and a temperature control switch protection tube is accommodated therein with its tip protruding to the center of the upper part of the annular partition wall. In a can in which the tip of the temperature control switch is located at the center of the upper part of the annular partition, even if hot water is started under the same conditions, the temperature difference between the average temperature at the center of the can and the upper part of the can is 5.0. ℃, there was no buildup caused by repeatedly turning the heating device on and off, and the hot water supply output was satisfactory.

In addition, the heating function was satisfactory and the operating conditions were very stable, leading to increased efficiency.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing an example of a heating water heater according to the present invention, Fig. 2 is a diagram showing an example in which the heat exchanger is a coil type, and Fig. 3 is a heating water heater according to the invention. FIG. 4 is a longitudinal sectional front view showing another example of the combustion chamber, and FIG. 4 is a diagram showing an example in which the combustion chamber has a jacket type structure. 1...Hot water tank, 2...Return trip, 3...
...outward trip, 4...heat exchanger, 5...
Water supply inlet, 6... Hot water supply outlet, 7... Combustion chamber, 8... Smoke pipe, 9... Upper part of can,
10... Annular partition wall, 11... Temperature control switch protection tube, 12... Air separator.

Claims (1)

[Scope of utility model registration request] A heating hot water tank with a heating return path connected to the lower part and a heating outgoing path connected to the upper part, a smoke pipe provided vertically penetrating the inside of this hot water tank, and a water supply inlet and a lower water supply inlet arranged around the smoke pipe. A heat exchanger having an upper hot water supply outlet extending through the side wall of the hot water tank, and a heat exchanger disposed between the heat exchanger and the smoke pipe, the lower end of which is located below the water supply inlet of the heat exchanger. an annular bulkhead extending above the hot water supply outlet of the heat exchanger and having an upper end close to the earthen wall of the hot water tank; 1. A heating water heater comprising: a temperature control switch protection tube that is provided at the top of the water tank and positions the tip of the temperature control switch housed therein at the center of the top of the annular partition wall.