JPH0521580Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a heating prevention device that is attached to an electric hot water tank constituting a human body private parts cleaning device, a washbasin water heater, or the like.

[Prior Art] Fig. 4 is a partially cutaway perspective view showing a human body private part cleaning device 3 installed in a Western-style toilet bowl 2 (indicated by a two-dot chain line). The human body private parts cleaning device 3 is a device in which a cleaning nozzle 4 extends into the toilet bowl 2a by operating a switch 2b arranged on the side of the toilet bowl 2, and sprays warm water onto the anus etc. after defecating. be. An electric heater (not shown) is provided in the hot water tank 1 constituting the human body private part cleaning device 3, and is used to heat and keep the stored water warm.

By the way, since the water stored in the hot water tank 1 is sprayed directly onto the private parts of the human body, it is extremely dangerous for the water to rise to an abnormally high temperature of more than a predetermined temperature (around 40 degrees Celsius) during storage. must also be prevented. In the conventional hot water tank 1, a liquid expansion type temperature control thermostat 5 is provided in the tank to control the supply of electricity to the heater intermittently.
Efforts were made to stabilize the temperature of the stored water (particularly to prevent it from rising to abnormal temperatures). In addition, the heater electric circuit is provided with a bimetallic safety thermostat 6 and a temperature fuse 7 connected in series, in case the temperature control thermostat 5 fails.
Double safety measures are taken to disconnect the circuit in the event of abnormal temperature rise. Furthermore, a float switch 8 is provided to prevent the hot water tank 1 from running dry in the event that the temperature control thermostat 5, safety thermostat 6, and temperature fuse 7 all fail. As shown in FIG. 5, the float switch 8 is vertically installed on the tank ceiling wall 1a, and has a float 9 attached to the lower end of an operating shaft 10 that can move up and down.
When the water level in the hot water tank 1 falls below a predetermined water level, the power supply to the heater is cut off in conjunction with the lowering of the float 9. As described above, the conventional hot water tank 1 is equipped with various safety devices in multiple layers.

[Problems to be Solved by the Invention] In the conventional hot water tank 1, safety devices other than the temperature control thermostat 5 and the float switch 8 were attached to the outer wall of the tank for waterproofing purposes. Therefore, these safety devices have the disadvantage of being easily influenced by the environmental temperature outside the tank. That is, especially in cold regions, when the temperature control thermostat 5 fails, it cannot be said that the safety thermostat 6 and the temperature fuse 7 will necessarily function correctly. Furthermore, a safety thermostat 6 and a temperature fuse 7 are installed on the outer wall of the hot water tank 1.
However, due to the heat transfer resistance of the wall forming the hot water tank 1, an abnormal temperature rise inside the hot water tank 1 cannot be detected instantaneously. In this case, no matter how many layers of safety equipment are installed, it will only serve as a supplementary measure.

The present invention was developed in view of the above-mentioned circumstances, and when the temperature inside the hot water tank exceeds a predetermined temperature, the temperature inside the hot water tank is reliably and quickly removed, without being affected by the environmental temperature outside the tank. The purpose of the present invention is to provide a new and safe heating prevention device (hereinafter referred to as the "proposed device") that can cut off power to an electric heater.

[Means for solving the problem] The gist of the proposed device is to cut off the electricity to the electric heater built into the hot water tank in conjunction with a float that descends as the water level in the hot water tank decreases. In a heating prevention device using a float switch, the float has an exhaust port for buoyancy loss above the waterline, a water inlet below the waterline, and a material that melts at abnormally high temperatures in the hot water tank. The exhaust port is covered with a plug formed from.

[Function] When the inside of the hot water tank becomes abnormally high temperature, the plug melts and opens the exhaust port for loss of buoyancy. A float with an open exhaust port loses its buoyancy by introducing water into the float through the water inlet and exhausting the air inside the float. Therefore, even if the tank is full of water, if the temperature of the stored water reaches an abnormally high temperature, the float loses its buoyancy and falls due to its own weight, regardless of the environmental temperature surrounding the hot water tank. As the float descends, the float switch cuts off power to the heater to prevent further heating in the tank.

[Description of Embodiments] The present device will be described below based on embodiments shown in the drawings.

(First Embodiment) FIG. 1 is an enlarged sectional view showing the main parts of the first embodiment. The improvement in this embodiment is that the main body 19a of the float 19 constituting the float switch 18 is
Exhaust port 19 for discharging air inside the float on the upper wall part 19b
d, and a water inlet 1 for introducing water into the lower wall portion 19c.
9e, and the exhaust port 19d and the water inlet 19e are covered air-tightly with plugs 16 and 17 that melt when exposed to abnormally high temperatures in the hot water tank 1. Note that the exhaust port 19d is formed at the upper wall portion 19.
The position is not limited to b, but any position may be used as long as it is above the waterline 19k and allows water to be introduced into the float 19 to cause it to lose its buoyancy. Furthermore, the water inlet 1
The formation position of 9e is not limited to the lower wall portion 19c, and may be located below the waterline 19k.
The float 19 is attached to the lower end of the switch operating shaft 10 which is vertically slidable or vertically swingable as in the conventional case. The main body 19a of the float 19 is made of a heat-resistant synthetic resin material such as polyester resin, which does not undergo thermal deformation at about 100° C., or a metal material. The plugs 16 and 17 are made of a low-temperature melting material (for example, a temperature fuse material) that melts when the temperature of the water stored in the tank W increases abnormally (for example, to 70° C.). The plugs 16 and 17 are attached to the float 19 by an appropriate air- and water-tight connection means such as adhesion, screwing, or caulking.

The float 19 configured in this way is such that when the temperature of the water W stored in the hot water tank 1 rises, the inside of the hot water tank 1 becomes warmer than the stopper 1.
When the melting temperature of 6 and 17 is reached, the plug part 1
6 and 17, the exhaust port 1 of the floating body 19a
9d and the water inlet 19e are uncovered. In the float 19, the air A inside the float is discharged through an exhaust port 19d with an uncovered lid, and a water guide port 19e is provided inside the float.
Since hot water flows in through the W, it loses its buoyancy and descends into the water storage W. Since the switch operating shaft 10 descends with the float 19, the float switch 18
cuts off the power to the heater to prevent the inside of the hot water tank 1 from being heated further. Note that the plug 17 that covers the water inlet 19e is provided as necessary.

If the plugs 16, 17 melt, it will be necessary to have them replaced by a specialist, so the cause of the abnormal temperature rise will be investigated, and safety will be ensured.

(Second Embodiment) FIG. 2 is a sectional view showing an enlarged main part of a second embodiment. This embodiment differs from the first embodiment in that the float 29 constituting the float switch 28
The water inlet 29 is a small hole in the lower wall 29b of the main body 29a.
At the same time, an exhaust pipe 29f protruding from the upper part of the main body 29a forms an exhaust port 29d for discharging air inside the float, and a stopper 26 that melts when exposed to abnormally high temperature in the hot water tank 1 forms the exhaust port 29d. 29d was sealed airtight. The plug body 29 is connected to the exhaust pipe 29f.
A tightening ring 22 is fitted as necessary to improve the airtightness.

(Third Embodiment) FIG. 3 is a sectional view showing an enlarged main part of a third embodiment. This embodiment differs from the first embodiment in that a float 39 constituting the float switch 38
An exhaust port 39d above the water line 39k and a water inlet port 39e below the water line 39k are integrally formed in the side wall portion 39g of the main body 39a of the main body 39a with elongated holes 39h that are long in the vertical direction. This is because the elongated hole 39h is closed air-tightly with the dissolving stopper 36.

[Effects of the invention] As detailed above, the present device has the following practical effects.

Since the water stored in the hot water tank is not heated to a high temperature higher than a predetermined temperature, there is no risk of burns or the like to the user of the human body private parts cleaning device.

Since the stopper attached to the float is located inside the tank, abnormal high temperature inside the hot water tank can be quickly and accurately detected without being affected by the environmental temperature surrounding the hot water tank. As a result, a hot water tank with improved safety compared to the conventional one can be obtained.

(3) With the device of this invention, conventional safety thermostats, temperature fuses, etc. can be used as dedicated protection devices for electrical circuits.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of the first embodiment of the present device, FIG. 2 is a sectional view showing the main parts of the second embodiment of the present device, and FIG. 3 is the main part of the third embodiment of the present device. FIG. 4 is a perspective view showing a conventional human body private parts washing device, and FIG. 5 is a side sectional view showing a conventional heating prevention device for a hot water tank. 1... Hot water tank, 16, 17, 26... Stopper, 18, 28, 38... Float switch, 1
9, 29, 39...Float, 19d, 29d, 39
d...exhaust port, 19e, 20e, 39e...water inlet, 19k, 29k, 39k...water line.

Claims (1)

[Scope of utility model registration request] In a heating prevention device that cuts off electricity to an electric heater built into a hot water tank using a float switch that is linked to a float that descends as the water level in the hot water tank decreases, the float is placed above the waterline. An exhaust port for loss of buoyancy is formed, a water inlet is formed below the waterline, and the exhaust port is covered with a plug made of a material that melts at abnormally high temperatures in the hot water tank. A heating prevention device.