JPS627959Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a water temperature control device for bathtubs.The purpose of this invention is to maintain the water volume in the bathtub almost constant, and once the water temperature is set as a guideline, it can be adjusted according to the season. To provide an extremely easy-to-use bath kettle water temperature control device that can obtain the appropriate temperature for bathing by stirring the bath water after it boils and automatically extinguishes the water, even if it is affected by the water temperature that changes depending on the water temperature. be.

Recently, as shown in Fig. 3, this type of bath water temperature control device has been developed using a thermocouple A that generates a thermoelectromotive force when heated by a pilot burner (not shown), and a thermocouple A that generates a thermoelectromotive force when heated by a pilot burner (not shown). In 1973, a switch C was connected in series to an electric circuit connected to an excitation coil B that was energized by the magnet to keep the electromagnetic safety valve open, and the switch C was built into a timer to automatically extinguish the fire for a limited time. −46804 publication,
In addition, with the same circuit configuration as above, a heat-sensitive part filled with an expansion liquid is placed facing the inlet and outlet channels of the heat exchanger, and the temperature difference between the inlet and outlet of the heat exchanger is detected and the liquid in the heat-sensitive part is expanded. A device to automatically extinguish a fire by opening the contact of switch C by force was developed in 1978-126828.
However, these ideas have drawbacks in accuracy of temperature control and ease of use during reheating. That is, in the former case, since the combustion time is controlled by a timer in a time-limited manner, it is greatly affected by water temperature due to seasonal changes, so it is necessary to adjust the setting time of the timer each time. In addition, in the latter case, the automatic extinguishing time varies depending on variations in the temperature detection position of the heat-sensing part and the temperature conditions at the inlet of the heat exchanger, and the drawback is that the automatic extinguishing time may change prematurely, especially if the bathtub water is stirred during combustion. There is.

Furthermore, what can be said for both is that once the water has automatically extinguished, it will be necessary to reheat it if it is left in hot water for a long time or if the timer is set too short. In this case, the user cannot automatically extinguish the fire, and the user must manually extinguish the fire when the bath water reaches an appropriate temperature.

The present invention overcomes the drawbacks of such cases, and uses the circuit configuration shown in Figure 3 above.
A pressure-responsive device is installed near the outlet of the heat exchanger to open and close the contacts of switch C, and an appropriate water flow resistance means is installed in the water flow channel that communicates the heat exchanger and the bathtub to set the hot water temperature as a guide. This bathtub utilizes the physical phenomenon that negative pressure is generated when water in a heat exchanger starts to boil, and a pressure responsive device senses the negative pressure to open the contact of the switch C and automatically extinguish the fire. The present invention provides a hot water temperature control device.

Embodiments of the bath kettle water temperature control device according to the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 designates a bathtub casing. Inside the casing 1 is a heat exchanger 2 and a gas burner 3, and in a gas passage leading to the gas burner 3 is a gas valve mechanism 5 that is opened and closed by an operating shaft 4. The gas valve mechanism 5 has an electromagnetic safety valve 6, a main valve 7, and a pilot valve 8 disposed in a gas passage leading to a pilot burner 9. Reference numeral 10 denotes a bathtub, and the bathtub 10 and the heat exchanger 2 are connected in a watertight manner through an upper circulation pipe 11 and a lower circulation pipe 12 to form a water passage. Reference numeral 13 denotes a diaphragm-type pressure-responsive device installed vertically in the water passage near the outlet of the heat exchanger 2. When the hot water in the heat exchanger 2 is heated and boiled, negative pressure is generated in the water passage, and the pressure-response is The switch 13 is operated so that the contact point of the switch C becomes "open". Further, the thermocouple A is attached to a position close to the flame of the pilot burner,
The thermocouple A, the excitation coil B of the electromagnetic safety valve 6, and the switch C are electrically connected in series.

Next, the structure of one embodiment of the water flow resistance means for controlling the water flow resistance of the water flow channel will be described. Reference numeral 14 denotes a control box having an operation handle 15 for setting a reference water temperature. Can be attached to walls, etc. 16 is a water flow controller attached to the bathtub side inlet of the lower circulation pipe 12; 16a is slid up and down within the water flow controller 16 to control the inlet opening area of the lower circulation pipe 12; It is a sliding board. Further, the control box 14 has a built-in pinion 17 pivotally supported by the operating handle 15 and a rack 18 that meshes with the pinion, and the rack 18 and the slide plate 16a are covered with a covering material such as vinyl chloride. Connected by wire 19, operating handle 15
By rotating left and right, the slide plate 1
6a is slid up and down.

Next, the operation of the bath kettle water temperature control device of the present invention having the above configuration will be explained.

First, in order to set the approximate water temperature, set the bathtub 1.
0 volume, bathtub 10 and upper and lower circulation pipes 11,1
When the operating handle 15 is rotated as appropriate according to the display on the control box 14 depending on the mounting position of the rack 2, the pinion 17 is simultaneously rotated to slide the rack 18 left and right, and the water passage is controlled via the wire 19. The inlet opening area of the lower circulation pipe 12 is determined by sliding the slide plate 16a inside the container 16 up and down.

Next, the operating shaft 4 is rotated to open the pilot valve 8, and the pilot burner 9 is ignited by an appropriate ignition means (not shown), and the flame heats the thermocouple A to generate a thermoelectromotive force. When the excitation coil B is excited and the electromagnetic safety valve 6 is opened, the operating shaft 4 is further rotated to open the main valve 7 and the gas burner 3 is combusted, and the heat exchanger 2 is heated by the combustion gas. Heat is transferred to the heated water in the water passage by the endothermic action of the heat exchanger 2, and a temperature difference occurs in the hot water between the inlet and outlet of the heat exchanger 2, which circulates in the water passage, gradually increasing the temperature in the bathtub 10. Raise the water temperature. Eventually, when the sum of the inlet temperature of the lower circulation pipe 12 and the heating temperature inside the heat exchanger 2 exceeds the boiling point of water, a boiling phenomenon begins inside the heat exchanger 2, and this physical phenomenon creates negative pressure in the water passage. occurs. At this time, the pressure reactor 13 installed in the water passage near the outlet of the heat exchanger 2 senses this negative pressure and opens the contact of the switch C to dissipate the magnetic force of the excitation coil B and generate an electromagnetic force. The safety valve 6 is shut off, the gas supply to the main valve 7 is cut off, the bathtub is automatically extinguished, and the heating of the bathtub water is stopped. After that, when the user takes a bath, the user can stir the boiling bath water to maintain the appropriate temperature.

The reason why the appropriate temperature can be obtained by stirring the bathtub water after the heating of the bathtub water is automatically stopped as described above is as follows.

In a natural circulation type bathtub, before stirring the boiling bathwater, as shown in FIG.

(b) The area from the upper edge of the upper circulation pipe 11 to the lower edge of the lower circulation pipe 12.

(c) Area from the lower edge of the lower circulation pipe 12 to the bottom of the bathtub.

It can be roughly divided into three areas.

By the way, among the respective regions, region A is a region with a relatively constant and relatively high temperature that is almost unaffected by the boiling start temperature, and region B is a region where the inlet opening area of the lower circulation pipe 12 controlled by the water passage controller 16 is controlled. This is a region where the temperature changes rapidly proportionally, and region C is a region where the initial temperature of the bathtub water before heating remains almost unchanged, and is approximately equal to the water temperature when reheating is not performed.

Next, when a natural circulation bath pot is installed in a bathtub in the normal installation state, the ratio of water volume in each of the above areas is generally approximately A: B: C = 3:5:2. , A, B, and C are respectively T ₁ , T ₂ , and T ₃ , then the average temperature at which the bath water is stirred after boiling and automatically extinguishing the water (this corresponds to the appropriate temperature for bathing) ) is expressed by equation (1).

3/10×T ₁ +5/10×T ₂ +2/10×T ₃ ...(1) Now, suppose that the average temperature of area A is T ₁ = 70℃, and the average temperature of area B is T ₂ = 40℃ (however, , the water flow controller 16 controls the inlet opening area of the lower circulation pipe 12 to set the water temperature so that the average temperature is 40°C), and the average temperature in area C is set considering changes in water temperature due to the four seasons. Assuming that T ₃ = 5 to 30℃ (1)
Substituting into the formula: 3/10 x 70 + 5/10 x 40 + 2/10 x (5~30)
= 42 to 47 (℃), and the water temperature during bathing after stirring does not vary greatly even if the water temperature changes throughout the seasons. Therefore, once the water temperature is set as a guide, the water flow resistance means of the passage channel By determining this, you will be able to obtain the appropriate temperature regardless of the effects of seasonal changes in water temperature.

Also, even if we assume that when the bath water is stirred before it starts boiling (that is, before it automatically turns off), the average temperature in area C rises to T ₃ = 37℃, 3/10 x 70 + 5/10 x 40+2/10×37=48.4(
℃), and the average temperature of the bath water after stirring is 48.4℃, which means that the temperature of the bath water can be controlled with a small difference in operating temperature.

Therefore, compared to the conventional examples described in Utility Model Publication No. 55-4680 and Utility Model Application Publication No. 54-126828, the present invention is almost unaffected by the water temperature due to seasonal changes, and the bathtub water is not heated after automatic extinguishing. You can easily obtain the appropriate temperature for bathing by stirring the water, so once you have set the water temperature as a guide, there is no need to adjust the water temperature setting in response to changes in water temperature.

Furthermore, if the bathtub is left for a long time after the automatic extinguishing fire has been extinguished, or if many people in a large family take a bath, the water in the bathtub will become lukewarm and it will be necessary to reheat it. Even in such cases, it is possible to reheat the water with the initial setting without changing the water temperature setting, and it can also automatically extinguish the fire, thus providing an extremely useful bath kettle water temperature control device. .

In addition, in the present invention, a water passage controller 16 is attached to the bathtub side entrance of the lower circulation pipe 12 as a water flow resistance means for the water passage, but this is not installed in the upper circulation pipe 1.
Of course, the same effect can be obtained even if it is attached to the outlet on the bathtub side of No. 1, but even if such a flow channel controller 16 is not used, in short, water flow resistance means can be provided in the flow channel. For example, by inserting a resistor that can change the cross-sectional area of the passage into the water passage, or by bringing the fins of the heat exchanger 2 closer to the vertical position, the resistance will be reduced.
It goes without saying that a method may be used in which the inclination angle of the fins is changed by taking advantage of the fact that the resistance increases as the fins approach the horizontal position.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a block diagram showing an embodiment of the water flow resistance means for the water passage, and FIG. 3 is an electric circuit diagram of the electromagnetic safety valve. A... thermocouple, B... excitation coil, C... switch, 1... casing, 2... heat exchanger, 3... gas burner, 4... operating shaft, 5... gas valve mechanism section, 6
...Solenoid safety valve, 7...Main valve, 8...Pilot valve, 9...Pilot burner, 10...Bathtub, 11...Upper circulation pipe, 12...Lower circulation pipe, 13...Pressure reactor, 14 ...Control box, 15...Operation handle, 16...
Water flow controller, 16a...Slide plate, 17...
Pinion, 18...easy.

Claims (1)

[Scope of utility model registration request] In a bathtub equipped with a starter safety device that has an electric circuit in which an excitation coil of an electromagnetic safety valve, a thermocouple, and a switch are connected in series, the water flow resistance of the water passageway that communicates the heat exchanger and the bathtub is controlled. A water temperature control device for a bathtub, characterized in that a water flow resistance means is provided, and a pressure response device for opening and closing the contacts of the switch is provided in the water flow path on the outlet side of the heat exchanger.