JPS63131957A - Temperature detector of hot water boiler - Google Patents

Abstract

PURPOSE:To make it possible to precisely detect the temperature of hot water within a boiler body and to supply hot water of a stable temperature by providing an insertion port of a temperature detector on the side wall of the boiler body, fitting the fitting base part of a temperature detector into this insertion port of the temperature detector in a watertight manner and disposing a heat sensitive part of the temperature detector within a heat exchange coil within the boiler body. CONSTITUTION:A protective cylinder 14 of a temperature detector 12 is inserted into a water chamber 2 through an insertion port 19, and a tip end 14A of the protective cylinder 14 is disposed on the inner side of a heat exchange coil 9 of the water chamber 2. At the time of operating a burner 3, since the temperature detector 12 detects the temperature of a rising water flow generated on the inner side of the heat exchange coil 9 of the water chamber 2, the rise in the hot water temperature can be precisely obtained by a heat sensitive element 15 and the response to the temperature detection can be improved. For this reason, it is possible to suppress the rise in the temperature by additional heating to a low value. Furthermore, overshooting accompanying the starting and stopping the burner 3 can be reduced, variation in the temperature of hot water in the water chamber 2 can be reduced, and further the supply of hot water at a stable temperature can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a temperature detection device for a hot water boiler, in which a heat exchange coil for exchanging heat with hot water in the can is disposed inside a can with a combustion chamber inside. .

(B) Conventional technology This type of hot water boiler circulates bath water through a heat exchange coil that exchanges heat with the hot water in a can body dedicated to hot water supply, thereby supplying hot water and reheating the bath. There is a known system that performs heating and hot water supply by flowing water for hot water through a heat exchange coil that exchanges heat with hot water. In such a hot water boiler, as disclosed in Japanese Utility Model Application No. 57-153947, a temperature sensor is attached to the side wall of the can body to detect the temperature of hot water outside the heat exchange coil inside the can body and to detect the temperature of the hot water outside the heat exchange coil inside the can body. was controlling the operation of the

(c) Problems to be Solved by the Invention However, with the above-mentioned hot water boiler temperature detection device, even if combustion occurs in the combustion chamber, there is a time delay in the temperature rise on the outside of the heat exchange coil. The disadvantages were that the after-boiling temperature became high and the hot water temperature fluctuated greatly as the burner started and stopped.

This invention was made in view of the above facts,
The purpose is to accurately detect the temperature of hot water inside a can housing a heat exchange coil and to supply hot water at a stable temperature.

(d) Means for solving the problem In this invention, in a hot water boiler in which a heat exchange coil for exchanging heat with hot water in the can is disposed inside a can with a combustion chamber inside, temperature is detected on the side wall of the can. An insertion opening is provided for the container, and the temperature sensor is attached to the insertion opening by attaching the base portion in a watertight manner, and at the same time, the temperature sensing part of the temperature detector is disposed inside the heat exchange coil inside the can body.

(E) Effect: With this configuration, the temperature of the rising water flow (natural convection) that occurs inside the heat exchange coil inside the can when the burner is activated can be directly detected with the temperature sensing part of the temperature detector. As a result, the rise in hot water temperature can be accurately detected.As a result, the after-boiling temperature after the burner is stopped can be suppressed to a low level, and fluctuations in hot water temperature can be reduced, making it possible to stabilize the hot water supply temperature.

(f) Examples Hereinafter, this invention will be explained in detail based on examples shown in the drawings.

In Figure 1, 1 is a can body dedicated to heating the hot water boiler.
A combustion chamber 6 is provided with a water chamber 2 inside the can body 1, and has a burner 3, a baffle pipe 4, and a smoke pipe 5 inside the can body 1.
is provided. A spiral heat exchange coil 9 connected to a water supply pipe 7 and a hot water supply pipe 8 is disposed in the ice compartment 2. The can body 1 is provided with a heating outlet 10 and a heating return port 11 at the upper and lower positions thereof. Furthermore, a temperature sensor 12 is attached to the side wall of the can body 1 to detect the temperature of hot water in the water chamber 2. Note that 13 is a control device that compares the temperature detected by the temperature detector 12 and the set temperature Ts, and starts and stops the burner 3 so that the hot water temperature in the water chamber 2 reaches the set temperature.

As shown in FIG. 2, the temperature sensor 12 described above includes a temperature sensing element protection tube 14 whose tip is closed, and a temperature sensing element 15 such as a thermistor housed in the tip (temperature sensing part) 14A of this protection tube 14. A cylindrical attachment with a threaded outer periphery fixed to the open end of the protection tube 14 is attached to the base 16, and a temperature-sensitive tube inserted through the base 16 and led out to the outside of the can body. Lead wires 17 and 18 of the element 15 are provided. Further, an insertion opening 19 for the temperature sensor 12 is provided in the side wall IA of the can body 1, and a socket 20 whose inner periphery is threaded is fixed to the insertion opening 19. Then, the protective tube 14 of the temperature sensor 12 is inserted into the water chamber 2 through the insertion port 19, and its tip 14A is allowed to be disposed inside the heat exchange coil 9 through the gap in the heat exchange coil 9. Furthermore, the temperature sensor 12 is mounted by screwing the base 16 into the socket 20 with a sealing tape (not shown) interposed therebetween, so that the temperature sensor 12 is watertightly mounted in the insertion port 19.

When the hot water in the water chamber 2 is circulated and supplied to a radiator (not shown) or when water for hot water supply flows through the heat exchange coil 9, the temperature of the hot water in the water chamber 2 decreases. Therefore, the temperature sensing element 15 of the temperature detector 12 detects a certain temperature lower than the set temperature, and the control device 1
3 activates burner 3. When the burner 3 operates and combustion occurs in the combustion chamber 6, natural convection occurs in the water chamber 2, with an upward water flow inside the heat exchange coil 9 and a downward water flow outside the heat exchange coil 9, and the hot water temperature rises. I will do it.

Then, when the temperature detected by the temperature sensing element 15 reaches the set temperature,
The control device 13 deactivates the burner 3.

According to this embodiment, the temperature sensing part of the temperature sensor 12 (the tip 14A of the protective tube 14 housing the temperature sensing element 15) is arranged inside the heat exchange coil 9 of the water chamber 2, and the temperature sensing part of the temperature sensor 12 is disposed inside the heat exchange coil 9 of the water chamber 2. Since the temperature of the rising water flow generated inside the heat exchange coil 9 of the water chamber 2 during operation is detected, the temperature sensing element 15 accurately captures the rise in water temperature, improving the responsiveness of temperature detection. be able to. Therefore, compared to the conventional system that detects the hot water temperature outside the heat exchange coil 9, the temperature increase due to after-boiling after the burner 3 is stopped can be suppressed to a low level. Further, overshoot caused by turning on and off of the burner 3 can be reduced, and fluctuations in the hot water temperature in the water chamber 2 can be reduced, allowing hot water to be supplied at a stable hot water temperature.

FIG. 3 compares the afterboiling characteristics of this example and the conventional one. In this embodiment, as shown by the solid line, the temperature rise in the water chamber 2 can be quickly detected, and the after-boiling temperature can be suppressed to a lower level than in the conventional system shown by the broken line.

FIG. 4 compares the hot water temperature characteristics when the burner 3 is frequently turned on and off, such as when water is continuously passed through the heat exchange coil 9. In this embodiment, the temperature is detected quickly, so overshoot of the hot water temperature can be reduced, fluctuations in the hot water temperature in the water chamber 2 can be reduced, and the hot water supply temperature can be stabilized.

(G) Effects of the Invention Since the present invention is configured as described above, it is possible to improve the responsiveness of the temperature-sensing section to the rise in water temperature in the ice room, suppress the temperature rise due to after-boiling, and to reduce the temperature rise in the water temperature. It can stabilize the hot water temperature by reducing fluctuations, improving safety and usability.It also has excellent workability when attached to the can body, making inspection and replacement services for temperature detectors easy. You can also do it.

[Brief explanation of the drawing]

Fig. 1 is a schematic structural diagram showing an example of a hot water boiler to which the present invention is applied, Fig. 2 is a sectional view of a temperature detection device for a hot water boiler showing an embodiment of the invention, and Fig. 3 is the same as that of Fig. 2. FIG. 10 is an explanatory diagram showing the reheating characteristics of the embodiment apparatus, and FIG. 10 is an explanatory diagram also showing the hot water temperature characteristics. 1... Can body, IA... Side wall of can body, 6...
Combustion chamber, 9... Heat exchange coil, 12... Temperature detector, 14... Temperature sensing element protection tube, 14A... Tip of protection tube (temperature sensing part), 16... Installation base,
19...Insertion port. Applicant Sanyo Electric Co., Ltd. and one other agent Patent attorney Takuji Nishino and one other person Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) In a hot water boiler in which a heat exchange coil for exchanging heat with the hot water in the can is installed inside a can with a combustion chamber inside,
An insertion port for the temperature sensor is provided on the side wall of the can, and the mounting base of the temperature sensor is watertightly attached to this insertion port, and the sensing part of the temperature sensor is placed inside the heat exchange coil inside the can. A temperature detection device for a hot water boiler, which is characterized by: