JPS592426Y2 - electric boiler - Google Patents

Description

[Detailed description of the invention] In order to air-cool the inside of a boiler case containing a hot water tank and a motor-driven pump, this invention attaches a cooling propeller fan to the pump motor, and uses this fan to actively cool the inside of the boiler case. The present invention relates to an electric boiler that is air-cooled, and particularly relates to an electric boiler for a hot water floor heater that is required to have low noise since it is installed indoors as an electric boiler for a hot water floor heater.

Generally, hot water floor heaters that heat the floor surface are heaters that use low-temperature radiation, and one of their characteristics is low noise.

In other words, in the case of a convection type, since warm air is blown into the room, wind noise is unavoidable, but in the case of a radiation type, the advantage is that there is no sound source.

However, electric boilers for hot water floor heaters have a built-in pump that pumps out hot water, so there is a sound source, and the boiler case must be sealed to prevent this sound from escaping.

Otherwise, you will not be able to take advantage of the low noise characteristic.

However, in this case, the following problem occurs.

The motor that drives the pump has better motor efficiency if the temperature of the motor coil is kept as low as possible, and for this purpose, the motor is equipped with a cooling fan.

If the boiler case is sealed now, the temperature inside the boiler will rise, and no matter how much air is circulated inside the boiler with the cooling fan, the motor coil temperature will not drop.

On the other hand, it is better to provide an air supply port that opens directly to the outside near the cooling fan because it reduces air supply resistance and allows a sufficient amount of air to be blown to the motor coil.
In this case, there is a disadvantage that the noise of the cooling fan is directly emitted to the outside, increasing the noise of the boiler.

In addition, providing the intake port on the bottom of the boiler case is advantageous because the gap between the floor and the bottom of the boiler case reduces noise to a greater extent than when providing the intake port on the side surface of the boiler case. However, there is a lot of dirt and dust on the floor, so if too much air is taken in from the intake port on the bottom of the boiler case, the dirt and dust will enter the boiler case and damage the pump motor bearing. This may lead to problems such as failure in some cases.

The purpose of this invention is to efficiently reduce the temperature inside the boiler case and reduce boiler noise by using the minimum number of openings to the outside air on the side circumference of the boiler case and appropriate openings on the bottom of the boiler case. The goal is to keep it to a minimum.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric boiler for a hot water floor heater according to an embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a boiler case, and inside thereof is provided a first tank 2 having an opening on the top surface and a hot water tank 3 having a built-in heater 4.

Furthermore, a pump 6 driven by a motor 5 and the motor 5 are fixed to the bottom surface 7 of the boiler case 1.

Further, the motor 5 is fixed so that the rotating shaft protruding from both sides is oriented horizontally.

A pedestal foot 8 is attached to the bottom surface 7 of the boiler case 1, and when the boiler case 1 is placed on the floor, the pedestal foot 8 creates a gap between the bottom surface 7 of the boiler case 1 and the floor surface. It is maintained.

9 is the upper wall of the boiler case 1, and the water supply port 10 and the upper opening of the first tank 2 are connected in a sealed state.

Further, the first tank 2 and the hot water tank 3 are connected by a supply pipe 11 and an air vent pipe 12, and the hot water tank 3 is further connected to the pump 6 by an outgoing pipe 13 and a pump suction port 14.

The discharge port 15 of the pump 6 is directly connected to a radiator (not shown) through a pipe 16.

Further, a return pipe 17 from the radiator is connected to the hot water tank 3.

A cooling propeller fan 18 is attached to the rotating shaft of the motor 5 protruding toward the opposite side of the pump 6, and this propeller fan 18 blows air to cool the motor 5.

Further, a first intake port 19 is provided on the bottom surface 7 of the pump case 1 on the suction side of the cooling propeller fan 18, and a cut-and-raised piece 20 is integrally formed on one side of the cooling propeller fan 18 side. ing.

In other words, the propeller fan 18 is located in a direction perpendicular to the opening surface of the first intake port 19 and slightly above the first intake port 19 toward the cut-and-raised piece 20 side.

In addition, as shown in FIG. 2, the approximately U-shaped air guide duct 21 is
It is attached to the back surface 22 of the boiler case 1, and one end thereof is connected to the second air intake port 2 provided on the back surface 22 of the boiler case 1.
3, and the other end is open to the suction side of the cooling propeller fan 18.

Furthermore, an exhaust port 24 is opened in the upper part of the back surface 22 of the boiler case 1, away from the cooling propeller fan 18.

The operation in the above configuration will be described.

First, water is supplied from the water supply port 10 to the first tank 2, then from the supply pipe 11 to the hot water tank 3, and from the outgoing pipe 13 to the pump 6.
Water is supplied to all of the radiators from the piping 16.

At this time, air is vented to the outside through the air vent pipe 12.

In this way, water is supplied to the entire system before use.

During heating, a motor 5 and a heater 4 are energized to heat water in a hot water tank 3, and a pump 6 supplies hot water to a radiator.

The hot water after heat radiation is returned to the hot water tank 3 through the return pipe 17 and sent to the radiator again to continue heating.

The heat generated by the hot water tank 3 being heated by the heater 4 and the motor 5
The temperature inside the boiler case 1 tends to rise due to the heat generated by
to cool down.

At this time, as shown in FIG. 3, if only the first intake port 19 is used, the wind F2 of the cooling propeller fan 18 hits the motor 5 and is returned to the suction side of the cooling propeller fan 18.
Outside air cannot be efficiently sucked in through the first intake port 19.

However, in one embodiment of the present invention, since the cut-and-raised piece 20 is provided, the wind F2 of the cooling propeller fan 18 is obstructed by the cut-and-raised piece 20 and flows away to the motor 5 side, and as a result, the efficiency is reduced. You can easily breathe in outside air Fl.

As a result, the first intake port 19 only needs to be a small opening.
It is possible to reduce dirt and dust existing on the floor from entering the boiler case, and it is also possible to prevent noise from the cooling propeller fan 18 from being released to the outside.

Next, the other end of the generally U-shaped air guide duct 21 provided on the back surface 22 of the boiler case 1 is open to the suction side of the cooling propeller fan 18, so as shown in FIG. The air is sucked in through the second intake port 23 and serves to cool the motor 5.

At this time, the noise of the cooling propeller fan 18 is prevented from leaking outside due to the effect of the approximately U-shaped wind guide duct 21.

Further, the wind F4 that has cooled the motor 5 passes through the hot water tank 3 having a high temperature and flows out from the exhaust port 24 as it is.

In this case, since the exhaust port 24 is far away from the cooling propeller fan 18, the noise from the cooling propeller fan 18 is attenuated by obstacles such as the hot water tank 3, and the amount leaking to the outside is also reduced. do.

As described above, according to the present invention, the cut-and-raised piece provided on the cooling propeller fan side of the first intake port periphery provided on the bottom of the boiler case so as to be close to the propeller fan allows the outside air to The propeller fan is installed on the bottom of the boiler case to efficiently suck the air into the boiler case, and the wind from the propeller fan is blocked by the cut-and-raised piece and is reliably sent to the motor side to cool the motor. The first intake port only needs to be a small opening, and as a result, it is possible to reduce dirt and dust on the floor from entering the boiler case, and it is also possible to reduce the noise from the cooling propeller fan being emitted to the outside. can also be prevented.

However, since the air volume is insufficient with only the first air intake port, in the present invention, a second air intake port is provided in a part of the lower part of the side peripheral surface of the boiler case, thereby reducing the air volume. The shortage can be compensated for by covering the second intake port from inside the boiler case in a substantially U-shape, and connecting one end to the second intake port.
By providing an air guide duct that communicates with the second intake port and has the other end open on the suction side of the propeller fan, consideration is given to preventing the noise of the cooling propeller fan from being directly emitted to the outside through the second intake port. As a result, the noise can be reduced compared to when the cooling propeller fan intake air is directly from the side surface of the boiler, and the internal temperature of the boiler case is also reduced between the first intake port and the second intake port. It can be lowered efficiently by intake air from the air intake port.

Furthermore, since the exhaust port 24 is located away from the noise source, this also helps reduce noise.

In other words, it is possible to provide an efficient motor cooling means with less noise.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of an electric boiler for a hot water floor heater according to an embodiment of the present invention, viewed from the front side, Figure 2 is a cross-sectional view of the electric boiler viewed from the side, and Figures 3 a and l) show the cut-and-raised pieces. It is a figure which compared and showed the flow of the wind in the case where it exists and the case where it does not exist. 1...Boiler case, 3...Hot water tank, 4...Heater, 5...Motor, 6
...Pump, 7...Bottom of case, 8
...... Base foot, 18... Cooling propeller fan, 19... First air intake port, 20...
・Cut and raised piece, 21... Air guide duct, 22.
...Back of the case, 23...Second intake port, 24...Exhaust port.

Claims (3)

[Scope of utility model registration request] (1) A first intake port is provided on the bottom surface that maintains a gap with the floor surface when placed on the floor surface, and a second intake port is provided on a part of the lower part of the side peripheral surface, and A boiler case with an exhaust port provided in the upper part, a hot water tank with a built-in heater installed in the boiler case, a motor installed in the lower part of the boiler case, and driven by the motor in the boiler case, and a pump for sending the hot water obtained in the hot water tank to the outside of the boiler case; A cooling propeller fan positioned above a portion adjacent to the first intake port so that the intake port is located, and a propeller fan positioned close to the propeller fan at a portion of the periphery of the first intake port on the propeller fan side. A cut-and-raised piece provided as shown in FIG. The first air guide duct has an open air guide duct, and the first air guide duct has an open air guide duct. An electric boiler configured to blow air sucked in from a second intake port to a motor and then exhaust it to an exhaust port. (2) In the lower part of the boiler case, a motor and a pump are located on the blowing side of the propeller fan in that order when viewed from the windward side, and a hot water tank is installed between these and the exhaust port located above them. The electric boiler according to claim 1 of the utility model registration claim, in which the electric boiler is located. (3) The electric boiler according to claim 1 or 2, wherein the second intake port is provided at the bottom of the back of the boiler case, and the exhaust port is provided at the top of the back of the boiler case.