JPH0732452U - Stop-type electric water heater - Google Patents

Abstract

(57) [Summary] [Purpose] An object is to provide a small-sized front stop type electric water heater that does not discharge expansion water. [Structure] The primary side of the hot water tank is connected to the water pipe, the secondary side is connected to the faucet, and the water tap is opened and closed to push out the hot water in the electric water heater to discharge it. In the electric water heater, the hot water tank is provided with a chamber for absorbing the pressure increase due to the expansion water.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small-sized front stop type electric water heater for a washbasin or a handwasher provided with a chamber that absorbs a pressure increase due to expanded water.

[0002]

[Prior art]

 A conventional small stop type electric water heater used in, for example, a washbasin or a handwasher is as shown in the perspective view of FIG. 6 and the schematic view of FIG. 7. As shown in the figure, in the front-end type thermostatic water heater 1, the primary side of the hot water tank 2 is connected to the water pipe via the pressure reducing valve 3, and the secondary side is connected to the faucet 4.

The secondary side of the hot water tank 2 is connected to an expanded water drainage channel 6 via a relief valve 5. As shown in FIG. 7, the expansion water drainage channel 6 is open on the terminal side to the atmosphere. The opening faces the water inlet of the branch drain pipe 7. The branch drainage pipe 7 is connected to the drainage pipe 9 of the washbasin 8 in the middle through a check valve 10. In FIG. 7, 11 is a heater for heating the stored water in the hot water tank 2, 12 and 13 are automatically ON / OFF controlled to keep the stored water within the set temperature range. It is a bimetal for heating and holding.

When the faucet 4 is opened, the tap water flows from the water pipe into the hot water tank 2, and the hot water in the hot water tank 2 is pushed out by that amount and discharged from the faucet 4. The tap water flowing into the warm water tank 2 is heated and held by the heater 11 whose ON / OFF is controlled by the bimetals 12 and 13 so as to be within a predetermined set temperature range.

The inside of the hot water tank 2 is always full, and when the tap water flows in, water colder than a predetermined temperature stays in the lower layer of the hot water tank 2. When the heater 11 heats the volume of the stored water, the pressure in the hot water tank 2 rises and the relief valve 5 opens. Therefore, the expansion water in the hot water tank 2 is discharged from the expansion water drainage channel 6 to the drainage pipe 9 through the branch drainage pipe 7, and the internal pressure of the hot water tank 2 drops to a safe value.

[0006]

[Problems to be solved by the device]

 However, in the conventional small-sized front stop type electric water heater 1, it is necessary to discharge the expansion water that is being boiled from the relief valve 5 and the expansion water drainage channel 6, including the branch drain pipe 7 for that purpose. Had to do plumbing work. When there is a P trap below the washbasin 8 and the handwasher, such a piping work could not be performed because the space for piping could not be secured.

According to the Occupational Safety and Health Act, a pressure vessel of this kind must be used within a gauge pressure of 1 Kgf / cm ² or less, and normally the pressure reducing valve 3 is set to 0.8 Kgf / cm ² to release the gas. The valve 5 is set to 0.95 Kgf / cm ² . The pressure reducing valve 3 responds to the pressure fluctuation of tap water and is essential, but the relief valve 5 is for use at a gauge pressure of 1 Kg f / cm ^{2 or} less, and the inside of the hot water tank 2 is If it is below this pressure, the relief valve 5 is unnecessary. However, in the above-mentioned conventional example, the relief valve 5 was indispensable for the pressure increase in the hot water tank 2 due to the expanded water.

[0008]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION The present invention has been made by improving and removing the above problem in view of the conventional problems described above, and an object of the present invention is to provide a small prestop type electric water heater that does not discharge expansion water.

Therefore, the means adopted by the present invention to solve the above problems is that the primary side of the hot water tank is connected to the water pipe, the secondary side is connected to the faucet, and the water pressure is controlled by opening and closing the faucet. In a prestop type electric water heater that pushes out and discharges the hot water in the electric water heater using the above, the hot water tank is provided with a chamber for absorbing the pressure increase due to the expansion water. It is a stationary electric water heater.

[0010]

[Operation] The hot water tank of the present invention is provided with a chamber for absorbing a rise in pressure, and if the pressure in the hot water tank rises due to boiling of the stored water in the tank, the increased pressure Accordingly, the air or other gas in the chamber is compressed and absorbs the volume expansion due to the expansion water.

Therefore, in the electric water heater of the present invention, the relief valve and the expansion water drainage channel are unnecessary, and the production and construction work of the electric water heater are convenient.

[0012]

【Example】

 The structure of the present invention will be described below with reference to the embodiments shown in the drawings. The same reference numerals as in the conventional case are the same members. FIG. 1 is a schematic view showing an entire electric water heater 14 according to an embodiment of the present invention. As shown in the figure, in the electric water heater 14 of this embodiment, a small-capacity pressure absorption tank 16 as a chamber for absorbing a pressure increase due to expanded water is provided on the upper side of the hot water tank 15. .

For example, assuming that the capacity of the hot water tank 15 is such that water having a water temperature of 4 ° C. can enter 1.5 liters, the size of the pressure absorption tank 16 is about 0.1 liters. Assuming now that the hot water tank 15 is filled with 1.5 liters of water having a water temperature of 4 ° C. and the pressure absorption tank 16 contains 0.1 liters of air, this hot water before boiling The internal pressure of the tank 15 is 0.4 Kgf / cm ² .

It is assumed that the heater 11 is operated from this state to raise the temperature of the stored water in the hot water tank 15 to 45 ° C. By this boiling, the water in the warm water tank 15 is expanded in volume to 1.515 liters of hot water. As a result, the air in the pressure absorption tank 16 is compressed to 0.085 liters.

[0015] inner pressure of the hot water tank 15 at that time, at an absolute pressure 1.935Kgf / cm ² and Do Ri becomes 0.9 kgf / cm ² when converted to gage pressure. Therefore, the electric water heater 15 of this embodiment is used within 1 Kgf / cm ² under the Industrial Safety and Health Law.

Therefore, the amount of hot water stored in the hot water tank 15 is set to 1.5 liters, the water supply pressure is set to 0.4 Kg f / cm ² , the capacity of the pressure absorption tank 16 is set to 0.1 liters, and the upper limit of the boiling temperature is set. If the temperature is set to 45 ° C, it is possible to provide an electric water heater that does not fall under the boiler stipulated by the Industrial Safety and Health Act without discharging expanded water.

The pressure absorption tank 16 may use a diaphragm as shown in FIGS. 2 to 5, other than the one shown in FIG. The pressure absorption tank 17 shown in FIG. 2 has a chamber 19 sealed by a diaphragm 18 in which gas such as air or nitrogen gas is sealed.

The pressure absorption tank 23 shown in FIG. 3 has a communication hole 21 provided in a chamber 20 defined by the diaphragm 18 and opened to the atmosphere, and the diaphragm 18 is urged by a pressure adjusting spring 22. Is.

Further, the pressure absorption tank 24 shown in FIGS. 4 and 5 is a case where the pressure adjusting panel 22 of the embodiment of FIG. 3 is made of a shape memory alloy. When the stored water in the hot water tank is heated from the state shown in FIG. 4 to the set temperature, the pressure adjustment spring 22 made of shape memory alloy senses this and contracts to the state shown in FIG. To increase the volume and reduce the pressure rise due to expanded water. The other basic actions for absorbing and mitigating the pressure increase due to the expansion water in the warm water tank 15 are the same in any of the embodiments.

By the way, the present invention is not limited to the above-described embodiment, and for example, the settings of the amount of hot water stored, the capacity of the pressure absorption tank, the boiling temperature, the water supply pressure, etc. are set according to the size of the equipment used It may be appropriately changed depending on the situation. As the pressure absorption tank, use commercially available products such as an accumulator that compensates the pump capacity of the anti-lock brake system for automobiles, and an accumulator used as an auxiliary pressure source for the operation valve of the pilot circuit of a hydraulic excavator. It is possible.

[0021]

[Effect of device]

 As described above, in the present invention, the hot water tank is provided with the chamber for absorbing the pressure increase due to the expansion water, and even if the expansion water is generated by boiling the stored water in the hot water tank, The chamber air or other gas is compressed to absorb the volume expansion of the expanded water. Therefore, the inside of the hot water tank does not become a dangerous pressure, and it is possible to omit the installation of the relief valve and the expansion water drainage channel. Therefore, the production and construction work of the electric water heater is extremely convenient.

[Brief description of drawings]

FIG. 1 is a schematic view showing an entire electric water heater according to the present invention.

FIG. 2 is a longitudinal sectional view showing an example of a pressure absorption tank according to the present invention.

FIG. 3 is a vertical sectional view showing another example of the pressure absorption tank according to the present invention.

FIG. 4 is a vertical cross-sectional view of a pressure absorption tank according to another embodiment of the present invention before being boiled, showing another example.

5 is a vertical cross-sectional view of the pressure absorption tank shown in FIG. 4 after boiling.

FIG. 6 is a perspective view showing an electric water heater installed below a conventional washbasin.

FIG. 7 is a schematic view showing an entire conventional electric water heater.

[Explanation of symbols]

14 ... Electric water heater 15 ... Hot water tank 16 ... Pressure absorption tank 17 ... Pressure absorption tank 18 ... Diaphragm 21 ... Communication hole 22 ... Pressure adjustment spring 23 ... Pressure absorption tank 24 ... Pressure absorption tank

Claims (1)

[Scope of utility model registration request] 1. The hot water tank has a primary side connected to a water pipe and a secondary side connected to a faucet, and by opening and closing the faucet, hot water in an electric water heater is pushed out and discharged by using tap water pressure. In the pre-stop type electric water heater, a pre-stop electric water heater is provided with a chamber for absorbing a pressure increase due to expansion water in a hot water tank.