JPS6231816Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a push-up type hot water storage tank that supplies water to the bottom, pushes up the heated water by this water supply, and discharges it from the spout at the top. This paper relates to improvements to water temperature detection devices.

[Conventional technology]

In a push-up type hot water storage tank, water supplied into the tank pushes up hot water stored in the upper layer of the tank. For this reason, the water inlet part is placed at the bottom of the tank so that hot water is discharged from the spout at the top of the tank, and the heater is also placed near the bottom of the tank to efficiently heat the water supplied into the tank. It is common to provide a Further, a temperature sensor for detecting the hot water temperature is similarly placed near the bottom of the tank, with one purpose of quickly detecting the temperature of the water entering the tank.

[Problem that the invention attempts to solve]

However, since the water entry part, the heater, and the temperature sensor are all laid out at the bottom of the tank, the heater and temperature sensor are positioned very close to each other at the bottom of the tank, which has a limited capacity. Therefore, in such a positional relationship, when the heater is energized, the water on its surface is rapidly heated, creating a turbulent thermal convection that flows upward around the temperature sensor. .

In this way, after energization, the temperature in the fluctuation range of unsteady thermal convection is detected without the amount of heat generated from the heater reaching the entire area of the water. Therefore, the heater off control time becomes unstable, and the hot water storage temperature and water discharge temperature cannot be maintained uniformly, making it unsuitable for use in washing the body.

Therefore, the purpose of this invention is to make it possible to detect the steady state water temperature in a hot water storage tank where the heater and temperature sensor need to be placed close to each other, without detecting the local increase in water temperature due to the heat generated by the heater. do.

[Means for solving problems]

In order to achieve the above object, the present invention includes an inlet pipe that extends toward the bottom of the hot water storage tank and has a lower end opening located near the bottom, and a spout that is opened at the top of the hot water storage tank. further comprising a heater and a temperature sensor on the bottom side of the hot water storage tank, the temperature sensor being a rod-shaped body oriented toward the bottom of the hot water storage tank, and upper and lower portions surrounding the lower portion of the temperature sensor. It is characterized by a heat shield plate with open ends.

〔Example〕

Hereinafter, the features of the present invention will be specifically explained with reference to embodiments shown in the drawings.

FIG. 1 is a cutaway front view of the bottom of the hot water storage tank of the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. 1.

A spout 2 through which heated hot water is discharged is provided at the upper end of the hot water storage tank 1, and an inlet pipe 3 is further provided that penetrates the upper end and extends toward the bottom. This water inlet pipe 3 has its axis at a position offset from the center of the hot water storage tank 1, and the opening 3a at the lower end is located near the bottom of the hot water storage tank 1, and the flow line of water supplied from the outside is at this bottom. This is the direction in which it points. Therefore, the inflowing water hits the bottom of the hot water tank 1 once and then flows upward.

In addition, a heater 4 for heating the water supply (for example,
A sheathed heater, etc.) is installed. This heater 4
is connected to the control circuit by passing through the upper end of the hot water tank 1, and the lower end portion is connected to the hot water tank 1 as shown in FIG.
It is formed in an annular shape so that it is arranged almost concentrically.

Further, a temperature sensor 5 for detecting the temperature of hot water in the hot water tank 1 is arranged at the center of the hot water tank 1 so as to extend to near the bottom. The lower end level of this temperature sensor 5 is set to be approximately the same as the lower end of the heater 4, and the temperature of the water or hot water rising within the hot water tank 1 is detected at the center position within the hot water storage tank 1.

Furthermore, a temperature sensor 5 is placed above the heater 4.
A heat shield plate 6 is arranged to optimize temperature detection. As is clear from FIG. 2, the heat shield plate 6 has one end connected to the water inlet pipe 3 and has a shape that surrounds the lower end of the temperature sensor 5.
That is, the heat shield plate 6 is formed into a cylindrical shape with open upper and lower ends, and its radius is smaller than the radius of the lower end annular portion of the heater 4 . Due to the arrangement and size/shape relationship with respect to the heater 4, the flow of hot water due to the influence of heat generation at the lower end of the heater 4 is prevented from directly reaching the temperature sensor 5.

In the above configuration, the water supply from the water inlet pipe 3 is as follows:
After hitting the bottom of the hot water storage tank 1, the hot water flows upward and is heated by the heater 4 during that time.
At this time, a convection phenomenon of hot water occurs due to heating, creating a turbulent state and causing the hot water to rise. On the other hand, since the temperature sensor 5 is surrounded by the heat shield plate 6, the high temperature hot water immediately after the start of heating does not locally reach the temperature sensor 5 portion. Further, since the heat shield plate 6 is open at the top and bottom, a portion of the upward flow passes through the inside thereof. Therefore, around the temperature sensor 5, it is possible to know the steady temperature as a whole without detecting the temperature only due to convection due to heating.

Furthermore, the same applies to the inlet water temperature; the rising flow from the opening 3a of the water inlet pipe 3 located below the heat shield plate 6 passes through the heat shield plate 6, so the temperature of the supplied water can also be accurately grasped. can. In addition, the water entering condition is determined after water is discharged from the opening 3a of the water inlet pipe 3 into the hot water storage tank 1.
Because the water hits the bottom of the tank, the water from all over the tank changes its direction upwards. As a result, water is not locally supplied into the hot water storage tank 1, and a uniform flow can be provided throughout the tank, and it is also possible to further improve the reliability of temperature detection by the temperature sensor 5. Become.

[Effect of idea]

As explained above, in the present invention, in a push-up type hot water storage tank, the lower end opening of the water inlet pipe is placed near the hot water storage tank, and the convection of hot water heated by the heater directly reaches the temperature sensor part. A heat shield plate is provided around the lower end of this temperature sensor to prevent this. Therefore, since the incoming water changes its flow upward after hitting the bottom of the hot water storage tank, water can be uniformly supplied throughout the tank, and errors in temperature detection by the temperature sensor can be reduced. Further, the heat shield plate around the temperature sensor allows the average hot water temperature to be detected without being affected by convection from the heater portion, so the reliability of temperature detection is improved.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view of the bottom portion of the push-up hot water storage tank of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1... hot water storage tank, 2... hot water outlet, 3... water inlet pipe,
3a...opening, 4...heater, 5...temperature sensor, 6...heat shield plate.

Claims (1)

[Scope of utility model registration request] A water inlet pipe extending toward the bottom of the hot water storage tank and having a lower end opening located near the bottom, and a hot water outlet opened at the top of the hot water storage tank, and a heater and a water outlet on the bottom side of the hot water storage tank. Equipped with a temperature sensor,
A push-up type hot water storage tank characterized in that the temperature sensor is a rod-shaped body oriented toward the bottom of the hot water storage tank, and a heat shield plate with open upper and lower ends surrounding the lower part of the temperature sensor is provided. Water temperature detection device.