JPH0828959A - Hot water storage type liquid heating equipment - Google Patents

Abstract

PURPOSE:To discharge deposits and scale settling in a tank and thereby to facilitate maintenance by attaching a liquid relief mechanism which opens a drain port pipe automatically and discharges a liquid inside the tank outside when the pressure and temperature inside the tank exceed set conditions. CONSTITUTION:Water is led into a tank 1 from a water supply port pipe 6 through a check valve 7 and a water introducing pipe 11. The water stored is heated by a plurality of electric heaters 18a and 18b sequentially. Moreover, the water heated is supplied from a hot water supply pipe 10. In this case, a liquid relief mechanism equipped with a pressure relief valve 30 opening automatically and discharging the water inside the tank 1 outside when the pressure, temperature, etc., inside the tank 1 exceed set conditions is attached to a drain port pipe 13. A temperature-pressure valve 9 is operated when the pressure and temperature inside the tank 1 become high extraordinarily, while the pressure relief valve 30 is operated when the pressure inside the tank 1 is a prescribed one or below. Thereby deposits and fur settling in the tank 1 are discharged automatically and maintenance is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water storage type liquid heating apparatus for heating a liquid stored in a tank and causing the liquid to flow from the tank to a supply source, and more particularly to a hot water storage type liquid heating apparatus in which the pressure in the tank is set to a predetermined pressure. The present invention relates to a liquid heating device.

[0002]

2. Description of the Related Art A water heater shown in FIG. 11 is well known as an example of a conventional hot water storage type liquid heating apparatus. This water heater
A metal tank 151, a water inlet pipe 152 integrally connected to the lower portion of the tank 151, and an electric heater 15 for heating water flowing through the water inlet pipe 52 into the tank 151.
5 and a hot water inlet pipe 156 integrally connected to the upper portion of the tank 151 to supply the hot water in the tank 151 to the outside.

In such a water heater, water is supplied to the water supply pipe 158.
From the inside through the water supply pipe 152 into the tank 151 and is stored. The water in the tank 151 is configured such that hot water heated by an electric heater 155 provided in the tank 151 is supplied from a hot water supply pipe 160 via a hot water supply port pipe 156 to supply hot water.

When connecting the water heater, the water supply pipe 158 on the source water side is connected to the water pipe so that the water pressure of the water flowing into the tank 51 via the pressure reducing valve 161 is maintained at 1 kg / cm ² or less. I have to. This pressure reducing valve 161 is used for the tank 15
It corresponds to the upper level of 1.

The tank 151 is made of a stainless plate. It is a general manufacturing method that the stainless steel plate is cut and bent and then welded to make the tank 151. Further, the electric heater 155 is placed inside the tank 151 from the side surface of the tank 151, and is directly connected to the tank 1.
The method of heating the water in 51 is adopted. In such a water heater, the water supply pipe 158, the hot water supply pipe 160, the water supply pipe 1
52, the hot water inlet pipe 156, the pressure reducing valve 161, and the like are complicatedly connected.

Therefore, since the water heater has a poor productivity due to its structure, it has a high initial cost, which is one of the obstacles to its popularization. Tank 1
Since No. 51 is manufactured by welding a thin plate (0.8 to 1.2 mm), not only the welding speed cannot be increased, but also the defective rate is high, skill is required for manufacturing, and the production equipment is too large. There are many problems that I have.

In recent years, some water heaters are made of resin, as opposed to metal water heaters. About this water heater,
Explaining with reference to FIG. 9, the metal water heater is a tank 1.
While the outer case is made of a metal plate together with 51 and contributes to the high cost, the resin water heater is easy to manufacture and can significantly reduce the cost.

[0008] In terms of performance, it is far superior to a metal water heater, and because it is made of resin, it has a heat retention property two to three times that of the metal tank 151. The reason for this is the difference in the thermal conductivity of the materials (resin; 0.3 Kcal /
mhr ° C., metal; 14 Kcal / mhr ° C.) as well as in its structure. That is, since the metal water heater has the legs 161 directly attached to the outer bottom of the tank 151 to support the tank 151, heat loss occurs from the tank 151 through the legs 161 due to metal heat conduction. On the other hand, the resin water heater has a tank 151 with legs 1
Since it is not necessary to attach 61 and only the entire tank 151 needs to be surrounded by the foam material of hard urethane, the heat conduction loss is very small.

[0009]

However, the water heaters made of resin and metal are
It is regulated that the working pressure according to the public standard is 1 Kg / cm ² or less, and use at a pressure higher than this is not permitted. Under such environmental conditions, when commercializing a water heater made of resin, pressure is added and a problem occurs.

The conventional water heater made of resin and metal has a working pressure of 1 Kg / cm ² or less as described above, but under these pressure conditions, the working pressure is too low and the pressure when used in a shower or the like. There is a problem such as lack of.

In Europe and the United States, the standard of working pressure is high,
There are also examples of direct connection to water. European and American standards include 150sig (1
0.55 Kg / cm < ² >)-82 [deg.] C.-100,000 cycles and 300 sig (21.1 Kg / cm < ² >)-15.
min. Anything that can withstand is required, and it is stricter than domestic standards.

The resin water heater does not need to consider the problem of corrosion due to its material, but since the electric heater 151 requires high temperature and high capacity, a metal electric heater 155, for example, There is no choice but to use a sheathed heater. Therefore, the life of the electric heater 155 including corrosion cannot be improved. Further, the increase in pressure in the tank 151 is an indispensable solution theme for both water heaters made of resin and metal, and without this solution, domestic regulations will be touched and commercialization will not be possible.

Further, it is necessary to regularly clean the inside of the tank 151 of the water heater. That is, if the periodic inspection for maintenance is forgotten, there is a problem that the sludge is accumulated on the bottom of the tank 151 for many years and the electric heater 155 is buried and the life is shortened.

Further, in the upper part of the tank 151, when the pressure in the tank 151 becomes higher than a predetermined pressure, hot water is discharged to the outside of the tank 151, so that a large heat loss occurs.

Therefore, an object of the present invention is to provide a hot water storage type liquid heating apparatus which solves various problems such as failure and life due to metal corrosion such as tank and overheating means.

Another object of the present invention is to provide a hot water storage type liquid heating apparatus which prevents pressure rise in the tank and has improved service and maintenance characteristics.

Still another object of the present invention is to provide a hot water storage type liquid heating device constructed so as to prevent heat loss of the liquid in the tank.

[0018]

According to the present invention, a tank, a heating device for heating a liquid stored in the tank, and a heating liquid heated to a predetermined temperature by the heating device are stored in the tank. In a hot water storage type liquid heating device that pushes up with a liquid flowing in from a lower part with a predetermined pressure and supplies the liquid from the upper part of the tank to the outside of the tank, a water inlet pipe connected to the upper part of the tank and the upper part of the tank It has a hot water inlet pipe and a discharge pipe connected to the lower part of the tank, and when the set conditions such as pressure and temperature in the tank are exceeded, the discharge pipe is automatically opened to There is provided a hot water storage type liquid heating device characterized in that a first fluid escape mechanism for discharging liquid to the outside of the tank is provided in the lower portion of the tank.

Further, according to the present invention, the first liquid releasing mechanism opens the discharge pipe to release the liquid in the tank when the pressure in the tank rises above a predetermined pressure. There is provided a hot water storage type liquid heating device having a first pressure relief valve for discharging to the outside of the tank.

Further, according to the present invention, the first fluid escape mechanism opens the discharge pipe to discharge the liquid in the tank when the temperature in the tank rises above a predetermined temperature. A hot water storage type liquid heating device is obtained which has a first temperature relief valve for discharging the liquid to the outside.

Further, according to the present invention, in the first liquid relief mechanism, the pressure / temperature in the tank is a predetermined pressure / temperature.
Hot water storage type liquid heating having a first pressure / temperature relief valve for opening the discharge port pipe and discharging the liquid in the tank to the outside of the tank when the temperature rises above the temperature. The device is obtained.

Further, according to the present invention, the heating device comprises:
A hot water storage type liquid heating device is obtained, which has a flange portion attached to a side wall of the tank and a heating portion which is held by the flange portion and provided in the tank.

Further, according to the present invention, the tank and the heating device are provided separately from each other, and the heating device has a conduit communicating between an upper part of the tank and a lower part of the tank. A hot water storage type liquid heating device is obtained, which has a heating pipe connected to an intermediate portion of the conduit and a heating unit for heating the heating pipe.

Further, according to the present invention, when the set conditions such as the pressure and temperature in the tank are exceeded, the first fluid release mechanism is actuated to release the pressure in the tank to the outside. There is provided a hot water storage type liquid heating device characterized in that the fluid releasing mechanism (2) is provided in the upper part of the tank.

Further, according to the present invention, the second fluid relief mechanism has a second pressure relief valve which is activated when the pressure in the tank exceeds a set pressure. A hot water storage type liquid heating device is obtained.

Further, according to the present invention, the second fluid relief mechanism has a temperature relief valve which is activated when the temperature in the tank rises above a set temperature. A liquid heating device is obtained.

Further, according to the present invention, in the second liquid escape mechanism, the pressure / temperature inside the tank is a predetermined pressure / temperature.
Hot water storage type liquid heating having a second pressure / temperature relief valve for opening the discharge port pipe and discharging the liquid in the tank to the outside of the tank when the temperature rises above the temperature. The device is obtained.

Further, according to the present invention, one end of the conduit is connected to the hot water inlet pipe, and the other end of the conduit is connected to the discharge outlet pipe. The device is obtained.

Further, according to the present invention, there is provided a hot water storage type liquid heating apparatus characterized in that a check valve is provided on the side of the conduit communicating with the lower portion of the tank.

[0030]

When the hot water storage type liquid heating apparatus of the present invention is used, when the pressure or temperature of the tank or the pressure / temperature exceeds a predetermined value, the first fluid releasing mechanism provided in the outlet pipe operates. , Let the liquid flow out of the tank. At the same time, the sludge accumulated at the bottom of the tank is discharged along with the liquid outflow.

Therefore, since the pressure is released by the cold liquid flowing into the bottom of the tank and the sludge is made to flow out at the same time, the warmed liquid is not released and a system with less heat loss is constructed.

In the case where the tank and the heating device are separately configured, the liquid is generated by the pressure increase and the action of the check valve due to the vaporization and expansion (expansion to about 1,700 times at 100 ° C.) by the heating device. Self-circulation occurs, resulting in a system that heats the liquid, and this rise in pressure may occur if it exceeds the baseline pressure during construction. However, in this case, in order to strictly adhere to the reference internal pressure, the first fluid release mechanism is used as a self-cleaning action in the tank, and at the same time as the opening of the first fluid release mechanism, the sludge accumulated on the bottom of the tank is automatically removed. To eliminate.

[0033]

EXAMPLE An example of the hot water storage type liquid heating apparatus of the present invention will be described below. FIG. 1 shows a water heater as an example of the hot water storage type liquid heating apparatus of the present invention, and FIG. 2 is a sectional view showing a schematic configuration of the water heater of FIG.

Referring to FIG. 1 and FIG. 2, the water heater is blow molded using, for example, a polybutene resin material.
It has a tank 1 made by molding, and an outer case 4 accommodating the tank 1 via a heat insulating material 3.

Blow molding is a molding method in which a tubular or bag-shaped material (parison) is enclosed in a mold, compressed air is blown into the mold to expand and cool it, and the shape is transferred to the mold cavity. It is known that a molded product having excellent strength and chemical resistance can be obtained.

In the tank 1, the outer case 4 is formed at the same time as molding.
Of the three mouth tubes formed to project from the upper surface of the
One water supply pipe 6 is projected on the outer surface of the outer case 4 and is connected to the water supply pipe (water pipe) via a check valve 7 to form the outer case 4.
The temperature / pressure valve 9 as a second fluid relief mechanism is connected to the other pressure port pipe 8 protruding above the outer surface of the container, and further another hot water supply port pipe 10 is projected onto the outer surface of the outer case 4. It is connected to a hot water supply pipe (not shown).

A water conduit 11 is inserted from the water inlet pipe 6 into the tank 1, and the upper end of the water conduit 11 is held by the water inlet pipe 6. A drain valve 14 is connected to a discharge port pipe 13 formed on the lower surface of the tank 1 so as to project from the lower surface of the outer case 4 simultaneously with molding.

The outer case 4 is provided with a component mounting portion 16 which is recessed from the outer peripheral surface of the outer case 4 in the vertical direction (longitudinal direction) of the outer case 4 for mounting electrical components during blow molding. There is. In the component mounting portion 16,
By removing a part of the outer case 4, a part of the outer surface of the tank 1 is exposed. First and second heater mounting holes 17a and 17b are formed in the upper and lower portions of the tank 1, respectively. Two first and second heater mounting holes 17
The a and 17b are, for example, first and second electric heaters 18a and 18 using sheath heaters as heating units, respectively.
b are inserted one to one. Packings 29a and 29b are attached to the first and second heater attachment holes 17a and 17b. The first electric heater 18a has a first flange portion 20a, and the second electric heater 18b has a second flange portion 20b. Here, the first and second electric heaters 18a and 18b, the first and second flange portions 2
0a and 20b are heating devices.

First and second flange portions 20a, 20b
Has a screw formed on the outer peripheral surface thereof. The first and second flange portions 20a and 20b are respectively the heater fixing metal fitting 1
The first and second electric heaters 18a and 18b are fixed to the tank 1 by being screwed onto the 7a and 17b.

A temperature limiter 21 is mounted near the outer surface of the tank 1 near the first electric heater 18a. The first flange portion 20a and the temperature limiter 21 are covered with a first electrical component cover 23a via a first protector 22a. The first electrical component cover 23a is attached to the component attachment portion 16 of the outer case 4 with a screw. A temperature controller 23 is attached near the outer surface of the tank 1 near the second electric heater 18b. The second flange portion 20b and the temperature controller 23 located on the outer surface of the tank 1 are covered with the second electrical component cover 23b via the second protector 22b. The second electrical component cover 23b is attached to the component attachment portion 16 of the outer case with a screw.
A power supply lead-in portion 26 is formed on the upper part of the component mounting portion 16, and the power supply lead-in portion 26 is formed by the power supply cover 24.
Is fixed to the component mounting portion 16 with a screw. A front panel 25 is detachably fitted to the component mounting portion 16 so as to cover the entire component mounting portion 16.

The temperature / pressure valve 9 as the second fluid relief mechanism is described in detail in the specification of Japanese Patent Application No. 326914 of 1993, which is an invention previously proposed by the applicant. Explaining this temperature / pressure relief valve 9,
As shown in FIG. 3, inside the valve case 9a screwed into the pressure port tube 8, a valve seat 9c fixed to the operating shaft 9b is provided.
The valve 9d is provided so as to be pressed against the valve seat 9g by the pressure spring 9f. Cap 9h
Prevents leakage of hot water to the upper part. The push-up pin 9k of the temperature sensor 9j is arranged slightly below the valve 9d so as to be vertically movable. Temperature sensor 9j
Is fixed to the temperature sensor mounting portion 9n of the valve case 9a, and the push-up pin mounting member 9p, the bias spring 9s, the piston 9t, and the oil 9u are accommodated in the cylinder 9m in this order from above. The upper end of 9m is closed by a lid 9v.

When the manual lever 9w is rotated counterclockwise, the actuating shaft 9b, the valve bearing 9c and the valve 9d integrally move upward against the pressure spring 9f, and the space between the valve 9d and the valve seat 9g is opened. To do.

The second fluid releasing mechanism used in the first hot water storage type liquid heating apparatus of the present invention operates when the temperature and pressure inside the tank 1 exceed the set conditions. Further, as the second fluid relief mechanism, a temperature relief valve (second temperature relief valve) having only an actuation mechanism including a temperature sensor 9j that senses temperature and operates, or operates by pressure. It is also possible to use a pressure relief valve provided only with an actuating mechanism including a pressure relief valve (second pressure relief valve) 9d, a pressure spring 9f, and the like.

Next, the operation of the above-mentioned water heater will be described. In the tank 1, water is introduced from the water inlet pipe 6 to the water conduit 11 via the check valve 7, and the water is supplied from the lower part of the water conduit 11 to the tank. Sequentially store inside 1. When the tank 1 becomes full of water, the water storage operation is stopped. In this state, the water stored inside the tank 1 is heated by the first electric heater 18a, and when it reaches around 80 ° C., it is switched to the second electric heater 18b by the temperature limiter 21. In addition, the temperature controller 23 controls the second electric heater 18b so that the hot water temperature maintains a predetermined temperature.

Further, it is self-evident that the hot water becomes hot water from the upper part to the lower part in the tank 1, and the water in the tank 1 can be made hot water, and the hot water and the water are not mixed in the tank 1. . The hot water is supplied by opening the hot water tap provided in the hot water supply pipe. At this time, since water is supplied from the water conduit 11 to the inside of the tank 1, the warm water is pushed up by the water located above the tank 1 and sequentially supplied. Should the pressure or temperature inside the tank become abnormally high, the temperature or
Safety is secured by allowing the pressure valve 9 to escape to the outside.

Further, when the set conditions such as pressure and temperature in the tank 1 are exceeded, the outlet pipe 13 is automatically opened to discharge the water in the tank 1 to the outside of the tank 1. A first liquid escape mechanism is provided. The first liquid relief mechanism is a pressure relief valve (first relief valve that releases the water in the tank 1 to the outside of the tank 1 when the pressure in the tank 1 rises above a predetermined pressure). Pressure relief valve)
Has 30.

That is, the temperature / pressure valve 9 provided in the upper portion of the tank 1 operates when the pressure / temperature inside the tank becomes abnormally high, whereas the pressure relief valve 30 keeps the internal pressure of the tank 1 at a high level. Operates at less than 1 Kg / cm ² . In FIG.
Although the pressure relief valve 30 is configured to be connected to the discharge pipe 13 together with the drain valve 14, as shown in FIG. 4, the pressure relief valve 30 is connected to the discharge pipe 13 and the drain is provided at the bottom of the tank 1. The drain valve 14 is provided with the mouth pipe 14a.
May be connected.

The pressure relief valve 30 has a cylindrical valve pipe portion 31a and this valve pipe portion 31a, as shown in detail in FIG.
The cylindrical connector 31b screwed into the casing via the packing material 32, the drain valve 32 provided inside the valve pipe portion 31a and the connector 31b, and the operating shaft 3 provided in the drain valve 32.
2a and a stopper portion 32b provided at the upper tip of the operating shaft 32a. The operation shaft 32a is provided with a support portion 32d that supports the drainage valve 32 via a metal fitting 32c at the lower end opposite to the tip end portion.

The pressure relief valve 30 has a valve pipe portion 31a.
It has a pressure spring 33 extending from the inner wall surface to the side of the operation shaft 32a and between the flange portion 31b on which the packing material 32 is placed and received and the stopper portion 32b.

The connector 31b is connected to the discharge port portion 13 formed in the lower portion of the tank 1. A tubular connecting pipe 33 penetrates through the discharge port portion 13 and engages with the discharge port portion 13. The upper portion of the connection pipe 33 located inside the discharge port portion 13 is engaged with the discharge port portion 13 via the O-ring 34. A joint pipe 35 is provided below the connection pipe 33. The connection pipe 33 and the connector 31b are coupled by a joint pipe 35 via a joint packing material 36. A drain connection pipe 37 connected to a drain pipe 38 connected to the drain valve 14 is formed at an intermediate portion of the connector 31b.

The drain valve 32 closes a through hole 32e formed in the center of the collar portion 36 in a normal state. That is, the pressure spring 37 acts so as to urge the operating shaft 33 toward the discharge port portion 13 side, and operates at less than 1 kg / cm ² .

The first liquid relief mechanism is not limited to the pressure relief valve 30 and may have the same operating mechanism as the second liquid relief mechanism, and the temperature in the tank 1 rises above a predetermined temperature. Sometimes, it may be a temperature relief valve (first temperature relief valve) that opens the outlet pipe 13 and drains the liquid in the tank 1 to the outside of the tank 1. Further, the liquid escape mechanism opens the discharge pipe 13 to open the tank 1 when the pressure / temperature in the tank 1 rises above a predetermined pressure / temperature.
It may be a pressure / temperature relief valve (first pressure / temperature relief valve) for discharging the liquid inside to the outside of the tank 1.

For example, the temperature / pressure valve 9 is 0.97 k
Set to operate at gf / cm ² . When the temperature operation is attached, it is set to operate at a temperature of 98 ° C to 99 ° C. On the other hand, the pressure relief valve 30 is 0.90 kgf
/ Cm ² ≦ 0.97 kgf / cm ² , and when temperature operation is attached, it is set to operate at 98 ° C to 99 ° C. That is, by operating the pressure relief valve 30 prior to the temperature / pressure valve 9, and if the pressure relief valve 30 does not operate due to clogging or the like, the temperature / pressure valve 9 is used to keep the safety, and It makes it possible to excrete, reduce heat loss and ensure safety. However, whether the temperature / pressure valve 9 is provided or not should be taken into consideration in the design if the pressure relief valve 30 alone can ensure safety.

The first liquid releasing mechanism is the discharge port tube 1
3 is opened and the liquid in the tank 1 is discharged to the outside of the tank 1, and at the same time, the sludge accumulated at the bottom of the tank 1 is discharged to the outside of the tank 1.

FIG. 6 and FIG. 7 show an embodiment of a hot water storage type liquid heating device having a heating device at a position separated from the tank 1. Other configurations are the same as those of the water heater shown in FIGS. 1 and 2 for easy understanding in explanation. 6 and 7, in the water heater, a first conduit 41 that guides the liquid in the direction of arrow A shown in FIG. 7 and a second conduit 41 that guides the heated liquid in the direction of arrow B shown. A heating device 40 is provided between the heating device 40 and the heating device 42 so as to turn the liquid into a heating liquid. The heating device 40 has a heating pipe 44 and an electric heater 43 such as a sheathed heater as a heating unit.

Further, one end of the heating pipe 44 is connected to the first conduit 41 via a check valve pipe 41a. The other end of the heating pipe 44 is connected to the second conduit 42. The check valve pipe 41a has a check valve 45 provided in at least one of the first conduit 41 and the second conduit 42 so as to allow the flow in the forward direction and prevent the flow in the reverse direction. are doing. In addition, the electric heater 43 and the heating pipe 44 are connected to the heat transfer material 47.
Are held together by. The electric heater 43 heats the heating pipe 44 to heat the liquid in the heating pipe 44, and pushes out the heated liquid heated to the second conduit 42 due to a pressure increase due to vaporization and expansion.

In the check valve pipe 41a, a valve chamber 48 is formed in a first joint pipe 46 which connects the first conduit 41 and the heating pipe 44 to each other, and a check valve is provided in the valve chamber 48. 45 and a valve receiving body 47 that blocks movement of the check valve 45 in the A direction. The check valve 45 closes the first through hole 48a formed in the lower wall of the valve chamber 48. In addition, a second through hole 47 a is formed in the valve receiving body 47 on the upper wall of the valve chamber 48. That is, the check valve 45 is movably accommodated between the upper wall and the lower wall of the valve chamber 48. Further, the second conduit 42 and the heating pipe 44 are connected by a second joint pipe 49. The heating tube 44 is made by, for example, extruding aluminum. The inner diameter of the heating pipe 44 is substantially the same as the inner diameters of the first conduit 41 and the second conduit 42, but is not limited to this.

Further, in the heating device 40, a temperature detector 51 as a temperature detecting means for detecting the temperature of the flowing water in the heating pipe 44, a temperature fuse 52 connected in series to the temperature detector 51, and a temperature detector. A temperature controller 54 as a control means for controlling the electric heater 43 based on the detection result of 51.
Are provided. The electric heater 43, the temperature detector 51, and the temperature fuse 52 are connected in series between the power supplies.

Next, the operation of heating the water in the heating device 40 will be described.

First, the tank 1 and the first and second conduits 4
1, 42 and the heating pipe 44 are filled with water. After that, the electric heater 43 is energized to heat the water. Water passes from the first conduit 41 through the first through hole 48a. At that time, the check valve 45 is pushed up by the pressure of water. Further, water passes through the second through hole 48b and flows from the connecting pipe 44 to the second conduit 42. Here, when the electric heater 43 is energized, the connection pipe 44 is heated and the water in the connection pipe 44 becomes hot water. The water in the heating pipe 44 gradually rises, reaches the boiling point locally (near the upper portion of the heating pipe), vaporizes and expands, and induces an instantaneous pressure increase (expands about 1,700 times at 100 ° C.). At this time, the warm water is sequentially heated and pushed out to the second conduit 42 due to the pressure rise due to the vaporization and expansion due to the local boiling. At this time, the check valve 45 closes the first through hole 48a to prevent the hot water from flowing back to the first conduit 41.

Therefore, the heated water is extruded in only one direction, that is, in the exit direction.

The source of pressure rise is the bubble 55 generated by local boiling in the heating tube. The bubbles 55 are extruded in the direction of the outlet together with the hot water, but at that moment, they are mixed with water in the moving part and have a boiling point or lower. Therefore, the disappeared pressure of the bubble 55 instantly returns to the initial state. The tank 1 and the first and second conduits 41 and 42 form a closed circuit, and the moved portion of the fluid flows into the heating pipe 44 through the check valve 45.
The expansion pressure due to the temperature rise of water increases in proportion to the temperature.

On the other hand, the local boiling part in the heating pipe 44 is instantly cooled at the moment of boiling, and the part is deprived of the heat of vaporization and moved by the fluid (water). Start heating the water. By repeating this operation, the water is sequentially heated and circulated, and hot water is stored from the upper part of the tank 1.

When the water in the tank 1 is heated and the bottom of the tank 1 is filled with hot water, the first and second conduits 41, 42
Hot water is also introduced into the inside, and eventually the water temperature at the entrance side of the heating device 40 rises rapidly. This becomes a sign of boiling, and if one senses the temperature of this portion and controls the electric heater 43, one hot water heating hot water storage system can be constructed. Although various control methods are possible, it is possible to combine methods suitable for the purpose such as mechanical compatibility, electronic control type, and microcomputer control type.

In such a hot water storage type liquid heating device, as shown in FIG. 8, the tank 1 is installed in the veranda 60 and the heating device 40 is provided so as to face the outer wall, or as shown in FIG. The tank 1 is installed underground and the heating device 4 is installed indoors.
0 may be provided, or as shown in FIG. 10, the heating device 40 and the tank 1 may be separately arranged on the ground outside.

The water heater provided separately with the heating device 40 is
As described above, it is set as a practical pressure under the pressure condition of the working pressure of 1 Kg / cm ² or less. In this situation, the heating device 40
When used as a heat source, the maximum set pressure of the pressure reducing valve, which must be installed in the input pipe of the water heater, is 0.85 Kg.
In addition to / cm ² , the above boiling pressure is added, but the pressure relief mechanism can be operated at the upper limit of 1 Kg / cm ² or less.

The heating device 40 performs heating and circulation pump action with the above-mentioned functions, and functions without a power source by a motor and a pump as in the conventional system. Further, as described above, a relief mechanism that automatically discharges a small amount of deposits or scales that settle in the tank 1 by utilizing the pressure increase due to heating provided in the tank 1 to the relief valve of the pressure relief mechanism provided in the tank 1 when opening and closing is provided. Even if periodic inspection is forgotten, the sludge accumulated on the bottom of the tank 1 is automatically discharged by the boiling pressure.

[0068]

As described above with reference to the embodiments, according to the hot water storage type liquid heating apparatus of the present invention, a fluid relief mechanism is provided in the lower portion of the tank, and the rise of pressure or temperature due to heating of the fluid is utilized. A small amount of deposits and scales that settle in the tank are automatically discharged when the fluid escape mechanism opens and closes, eliminating the need to regularly clean the inside of the tank as in the past, which is advantageous in terms of maintenance. Even if you forget to transfer regularly, the heater will not be buried in the sludge accumulated at the bottom of the tank and the life will not be shortened.

Further, if a fluid relief mechanism is provided in the upper and lower portions of the tank, and the fluid relief mechanism in the lower portion of the tank is activated and then the fluid relief mechanism in the upper portion of the tank is activated, the safety is improved.

If the tank is made of plastic and the heat insulating material, the case, etc. are made of plastic, the tank has a half-permanent life, is small, and can be installed in a place where maintenance is easy.

Further, in the hot water storage type liquid heating device having the heating device at a position separated from the tank, since the fluid and liquid releasing mechanism are used for heating and circulating pump action, the motor and pump are used as in the conventional system. Since it works without a power source, it is lightweight, compact, long life, high quality,
An inexpensive heating device with good serviceability can be obtained.

Further, by utilizing the heating device which circulates the liquid by utilizing the vaporization and expansion pressure due to the local boiling phenomenon, a fluid escape mechanism is provided at the bottom of the tank so as to suppress the pressure increase below a specified value. Sludge (accumulated impurities, sediment) collected at the bottom of the tank by the fluid relief valve No. 1
Is automatically excreted each time the first fluid release mechanism operates,
The conventional troublesomeness of regular maintenance and inspection has been eliminated, and due to inadequate inspection, the electric heater will not be buried in the sludge accumulated at the bottom of the tank for many years, and it will not overheat and cause stairs. It has an effect of not extending the life and extending the life.

Further, in the conventional water heater, since the fluid escape mechanism is provided only in the upper portion of the tank, the hot water located in the upper portion of the tank was discharged, and the heat loss was large, but the fluid escape mechanism was used. Since the cold liquid that has not been heat-exchanged is discharged because it is provided in the lower part of the tank, an efficient system with very little heat loss can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a hot water storage type liquid heating apparatus of the present invention, showing a partial cross section and a disassembled state.

FIG. 2 is a sectional view of the hot water storage type liquid heating apparatus of FIG.

FIG. 3 is a cross-sectional view of a fluid relief mechanism provided in an upper portion of a tank of the hot water storage type liquid heating apparatus of FIG.

FIG. 4 is a cross-sectional view showing another connection example of the fluid relief mechanism provided in the lower portion of the tank of the hot water storage type liquid heating apparatus of FIG.

5 is a cross-sectional view of a fluid escape mechanism at the bottom of a tank used in the hot water storage type liquid heating apparatus of FIG.

FIG. 6 is a schematic view showing another embodiment of the hot water storage type liquid heating apparatus of the present invention and showing a state in which the heating apparatuses are separately arranged.

7 is a cross-sectional view of the heating device of FIG.

8 is a perspective view showing an arrangement example of the hot water storage type liquid heating apparatus of FIG. 4. FIG.

9 is a perspective view showing an arrangement example of the hot water storage type liquid heating apparatus of FIG. 4. FIG.

FIG. 10 is a perspective view showing an arrangement example of the hot water storage type liquid heating apparatus of FIG.

FIG. 11 is a schematic sectional view showing a conventional hot water storage type liquid heating device.

[Explanation of symbols]

 1,151 Tank 3 Heat insulating material 4 Exterior case 6,152 Water inlet pipe 7 Check valve 9 Temperature / Pressure valve 10,156 Hot water inlet pipe 11 Water guide pipe 13 Discharge pipe 18a First electric heater 18b Second electric heater 30 pressure relief valve 33 operating shaft 37 pressure spring 40 heating device 41a check valve pipe 43,155 electric heater 44 heating pipe 45 check valve 161 pressure reducing valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Gen Takizawa 1-1-1, Omorinishi, Ota-ku, Tokyo Within Nippon Electric Co., Ltd. (72) Gokio Sugiyama 1-1-1, Omorinishi, Ota-ku, Tokyo No. Nippon Electric Heat Co., Ltd.

Claims (12)

[Claims] 1. A tank, a heating device for heating a liquid stored in the tank, and a heating liquid heated to a predetermined temperature by the heating device from a lower part of the tank with a predetermined pressure. In a hot water storage type liquid heating device that pushes up and supplies the water from the upper part of the tank to the outside of the tank, a water supply pipe connected to the upper part of the tank, a hot water supply pipe connected to the upper part of the tank, and a lower part of the tank. A discharge pipe connected to the tank, the discharge pipe being automatically opened when the set conditions such as pressure and temperature in the tank are exceeded, and the liquid in the tank is discharged to the outside of the tank. 1
The hot water storage type liquid heating device, characterized in that the fluid releasing mechanism is provided at the lower part of the tank. 2. The hot water storage type liquid heating apparatus according to claim 1, wherein the first liquid relief mechanism opens the discharge pipe when the pressure in the tank rises to a predetermined pressure or higher. A hot water storage type liquid heating apparatus having a first pressure relief valve for discharging the liquid in the tank to the outside of the tank. 3. The hot water storage type liquid heating apparatus according to claim 1, wherein the first fluid relief mechanism opens the outlet pipe when the temperature in the tank rises above a predetermined temperature. First for discharging the liquid in the tank to the outside of the tank
A hot water storage type liquid heating device, characterized in that it has a temperature relief valve. 4. The hot water storage type liquid heating apparatus according to claim 1, wherein the first liquid relief mechanism is configured to discharge the discharge pipe when the pressure / temperature in the tank rises to a predetermined pressure / temperature or higher. And a first pressure / temperature relief valve for opening the tank to discharge the liquid in the tank to the outside of the tank. 5. The hot water storage-type liquid heating device according to claim 1, wherein the heating device includes a flange portion attached to a side wall of the tank, and a heating portion held in the flange portion and provided in the tank. A hot water storage type liquid heating device having: 6. The hot water storage-type liquid heating device according to claim 1, wherein the tank and the heating device are provided separately from each other, and a conduit is provided between the upper part of the tank and the lower part of the tank. However, the heating device has a heating pipe connected to an intermediate portion of the conduit and a heating unit for heating the heating pipe. 7. The hot water storage type liquid heating apparatus according to claim 1, wherein when the set conditions such as pressure and temperature in the tank are exceeded, the hot water storage type liquid heating apparatus operates following the first fluid release mechanism to operate in the tank. A hot water storage type liquid heating device comprising a second fluid releasing mechanism for releasing pressure to the outside at the upper part of the tank. 8. The hot water storage type liquid heating apparatus according to claim 1, wherein the second fluid relief mechanism has a second pressure relief valve that operates when the pressure in the tank exceeds a set pressure. Hot water storage type liquid heating device characterized in that. 9. The hot water storage type liquid heating apparatus according to claim 1, wherein the second fluid relief mechanism has a second temperature relief valve which is activated when the temperature in the tank rises to a set temperature or higher. Hot water storage type liquid heating device characterized by being. 10. The hot water storage type liquid heating apparatus according to claim 1, wherein the second liquid relief mechanism is configured to:
A hot water storage type liquid heating device comprising a second pressure / temperature relief valve for opening the discharge port pipe and discharging the liquid in the tank to the outside of the tank. 11. The hot water storage type liquid heating apparatus according to claim 6, wherein one end of the conduit is connected to the hot water inlet pipe and the other end of the conduit is connected to the outlet pipe. Hot water storage type liquid heating device. 12. The hot water storage type liquid heating apparatus according to claim 6, wherein a check valve is provided on the side of the conduit communicating with the lower portion of the tank.