JPS5875657A - Hot water storage tank - Google Patents

Abstract

PURPOSE:To make low-voltage control possible by a structure wherein relays equipped with contact in the hot water storage tank are shut-off from outside air with heat insulating material in order to prevent dew condensation. CONSTITUTION:Relays such as a temperature switch 3, a no-water relay 4 and the like are installed on the cover 5 of the upper opening of a water reservoir 6 and the heat insulating material 7 covers over the relays leak-tight in order to prevent the heat radiation. During water-feeding and heating, the space 8 between the cover 5 of the water reservoir 6 and the heat insulating material 7 is kept at high temperature state. Because the apparatus main bodies equipped with relay contacts installed in the space 8 are shut-off from outside air and kept at the same high temperature state as the space 8, the apparatus main bodies are prevented from dew condensation and moreover of their contacts is improved. As a result, the relays such as the temperature switch, the no-water relay and the like can be controlled in the hot water storage tank with the low voltage of 24V.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water storage tank, and more particularly to a hot water storage tank equipped with a relay that controls the water level and temperature within the tank during hot water supply and heating.

Control devices such as temperature switches and water cutoff relays in conventional hot water storage tanks are controlled with a voltage of 100V, so the contact points cannot be installed inside the hot water tank, and the high voltage can easily cause accidents such as electric shock. . Also, even if a 24v low voltage control device is installed in the tank, hot water supply and
The disadvantage is that dew condensation occurs on the contact points due to the temperature difference between the internal temperature of the hot water storage tank and the outside air temperature due to heating, which tends to cause contact failure.

The purpose of the present invention is to provide temperature switches and water cutoff relays because it is dangerous in itself to control relays such as temperature switches and water cutoff relays with high voltages of 100V, and low voltages of 24V are likely to cause contact failures due to condensation, etc. By covering the main body of the device with a heat insulating material, it is isolated from the outside air, and by keeping the temperature the same as the temperature inside the hot water tank, it prevents dew from forming on the contacts. Our goal is to provide a hot water storage tank that makes it possible.

The present invention prevents dew from forming on the contacts by isolating a relay that has contacts inside the hot water tank from the outside air using a heat insulating material and keeping the temperature the same as the inside of the hot water tank. This is intended to control voltage. Generally, moisture present in the air tends to condense or liquefy on objects whose temperature is below the dew point temperature of the atmosphere. Based on this principle, conversely, it takes advantage of the fact that if the temperature of the device itself is the same as the atmospheric temperature in the hot water storage tank, dew will not form on the device, that is, the contact portions, and contact failures can be prevented.

Next, one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of the hot water storage tank of the present invention. Water is stored in a water tank 6 by the water supply device 1, and the water is heated by the heating device 2. This heating maintains the inside of the hot water tank at a high temperature. Relays such as a temperature switch 3 and a water cutoff relay 4 are installed in advance on a cover 5 at the upper opening of the water tank 6, and the top thereof is sealed with a heat insulating material 7 to prevent heat dissipation. When hot water is being supplied or heated, the space 8 between the water tank cover 5 and the heat insulating material is maintained at a high temperature, and the main body of the equipment with the relay contact installed there is also isolated from the outside air, so that it will not be kept at the same high temperature. As a result, phenomena such as dew buildup on the device body and even the contacts do not occur.

As a result, the temperature switch can be
It is possible to control relays such as water cutoff relays at low voltage within the hot water storage tank.

According to an embodiment of the present invention, by utilizing the principle that the device body installed in the same temperature range of the same atmosphere will also have the same temperature, the temperature switch will not occur on the device body.・It is possible to install the main device with a contact part such as a water cutoff relay in the hot water tank and control it with a low voltage of 24V.

As described above, according to the present invention, since phenomena such as dew buildup on the main body of the relay device do not occur, it is possible to obtain the effect of preventing electric shock and contact failure.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view of a hot water storage tank showing an embodiment of the present invention.

Claims (1)

[Claims] 1. A water tank, a water supply device that replenishes water to the water tank, a cover for the opening of the water tank, a heating device that heats the water in the water tank, and a surrounding area of the water tank and the cover. In the hot water tank, the relay is provided between the cover and the heat insulating material, a relay that opens and closes depending on the water level in the water tank, and a relay that opens and closes depending on the water temperature in the water tank. A hot water storage tank characterized by being placed in a closed space.